Crypt2 VB.NET Reference Documentation

Crypt2

Chilkat encryption component.

Object Creation

Dim obj As New Chilkat.Crypt2()

Properties

AbortCurrent As Boolean

Introduced in version 9.5.0.58

When set to True, causes the currently running method to abort. Methods that always finish quickly (i.e.have no length file operations or network communications) are not affected. If no method is running, then this property is automatically reset to False when the next method is called. When the abort occurs, this property is reset to False. Both synchronous and asynchronous method calls can be aborted. (A synchronous method call could be aborted by setting this property from a separate thread.)

BCryptWorkFactor As Integer

Introduced in version 9.5.0.65

The BCrypt work factor to be used for the BCryptHash and BCryptVerify. This is the log2 of the number of rounds of hashing to apply. For example, if the work (cost) factor is 12, then 2^12 rounds of hashing are applied. The purpose of this cost factor is to make the BCrypt computation expensive enought to prevent brute-force attacks. (Any complaints about BCrypt "not being fast enough" will be ignored.)

This property must have a value ranging from 4 to 31 inclusive.

The default value is 10.

BlockSize As Integer (ReadOnly)

The block-size (in bytes) of the selected encryption algorithm. For example, if the CryptAlgorithm property is set to "aes", the BlockSize property is automatically set to 16. The block-size for the ARC4 streaming encryption algorithm is 1.

CadesEnabled As Boolean

Applies to all methods that create PKCS7 signatures. To create a CAdES-BES signature, set this property equal to True. The default value of this property is False.

CAdES BES Detached Signature

CAdES BES Attached (Opaque) Signature

CadesSigPolicyHash As String

Applies to all methods that create PKCS7 signatures. To create a CAdES-EPES signature, set the CadesEnabled property = True, and also provide values for each of the following properties: CadesSigPolicyHash, CadesSigPolicyId, and CadesSigPolicyUri. For example (in pseudo-code):

cryptObj.CadesSigPolicyId = "2.16.76.1.7.1.1.1"
cryptObj.CadesSigPolicyUri = "http://politicas.icpbrasil.gov.br/PA_AD_RB.der"
cryptObj.CadesSigPolicyHash = "rySugyKaMhiMR8Y/o5yuU2A2bF0="
Note: Do NOT use the values above. They are only provided as an example to show valid values. For example, the Policy ID is an OID. The Policy URI is a typically a URL to a DER encoded policy file, and the Policy Hash is a base64 encoded hash.

CadesSigPolicyId As String

See the description for the CadesSigPolicyHash property above.

CadesSigPolicyUri As String

See the description for the CadesSigPolicyHash property above.

Charset As String

Controls the character encoding of the text encrypted, signed, hashed or compressed. This property is relevant wherever strings are used as inputs or outputs.

When working with strings, it is important to know the exact bytes that are being encrypted/hashed/signed/compressed. This is critical when interoperating with other systems. If your application is sending an encrypted string to another system that will decrypt it, you will need to know the encoding of the string that is expected on the receiving end (after decryption). If you pass Unicode data (2 byte per character) to the encryptor, subsequent decryption will reproduce the original Unicode. However, it may be that your program works with Unicode strings, but the recipient of the encrypted data works with iso-8859-1 strings. In such a case, setting the Charset property to "iso-8859-1" causes the character data to be automatically converted to the Charset before being encrypted (or compressed, or hashed, or signed). The set of valid charsets is listed below:


hex
base64
    * "hex" and "base64" are special values that allow for binary (non-text) encoded data to be passed to any method where the input data is a string.
       Rather than converting to an actual charset (such as utf-8, iso-8859-1), the binary data is decoded, and the decoded bytes are passed
        to the underlying encryptor, hashing, signing, etc.
ANSI
us-ascii
unicode
unicodefffe
iso-8859-1
iso-8859-2
iso-8859-3
iso-8859-4
iso-8859-5
iso-8859-6
iso-8859-7
iso-8859-8
iso-8859-9
iso-8859-13
iso-8859-15
windows-874
windows-1250
windows-1251
windows-1252
windows-1253
windows-1254
windows-1255
windows-1256
windows-1257
windows-1258
utf-7
utf-8
utf-32
utf-32be
shift_jis
gb2312
ks_c_5601-1987
big5
iso-2022-jp
iso-2022-kr
euc-jp
euc-kr
macintosh
x-mac-japanese
x-mac-chinesetrad
x-mac-korean
x-mac-arabic
x-mac-hebrew
x-mac-greek
x-mac-cyrillic
x-mac-chinesesimp
x-mac-romanian
x-mac-ukrainian
x-mac-thai
x-mac-ce
x-mac-icelandic
x-mac-turkish
x-mac-croatian
asmo-708
dos-720
dos-862
ibm037
ibm437
ibm500
ibm737
ibm775
ibm850
ibm852
ibm855
ibm857
ibm00858
ibm860
ibm861
ibm863
ibm864
ibm865
cp866
ibm869
ibm870
cp875
koi8-r
koi8-u

Using "hex" or "base64" for encoded binary data input.

CipherMode As String

Controls the cipher mode for block encryption algorithms (AES, Blowfish,TwoFish, DES, 3DES, RC2). Possible values are "CBC" (the default) , "ECB", "CTR", "OFB", "GCM", and "CFB". These acronyms have the following meanings:

  • CBC: Cipher Block Chaining,
  • ECB: Electronic CookBook
  • CTR: Counter Mode
  • CFB: Cipher Feedback
  • OFB: Output Feedback
  • GCM: Galois/Counter Mode

(see http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation )

Note: Prior to Chilkat v9.5.0.55, the CFB mode is only implemented for AES, Blowfish, and DES/3DES, and the CTR mode is only implemented for AES.

Starting in v9.5.0.55 CFB and OFB modes are useable with all encryption algorithms, and GCM (Galois/Counter Mode) is available with any cipher having a 16-byte block size, such as AES and Twofish. CFB, OFB, CTR, and GCM modes convert block ciphers into stream ciphers. In these modes of operation, the PaddingScheme property is unused because no padding occurs.

CompressionAlgorithm As String

This property is deprecated. It will be removed in a future version.

This property is deprecated. The only possible value is "BZIP2". The compression functionality in Crypt2 is legacy and existed long before the general compression functionality that is currently offered in Chilkat.Compression. The Chilkat.Compression API should be used instead.

CryptAlgorithm As String

Selects the encryption algorithm for encrypting and decrypting. Possible values are: "chacha20", "pki", "aes", "blowfish", "blowfish2", "des", "3des", "rc2", "arc4", "twofish", "pbes1" and "pbes2". The "pki" encryption algorithm isn't a specific algorithm, but instead tells the component to encrypt/decrypt using public-key encryption with digital certificates. The other choices are symmetric encryption algorithms that do not involve digital certificates and public/private keys.

The original Chilkat implementation of Blowfish has a 4321 byte-swapping issue (the results are 4321 byte-swapped). The new implementation ("blowfish2") does not byte swap. This should be used for compatibility with other Blowfish software.

Password-based encryption (PBE) is selected by setting this property to "pbes1" or "pbes2". Password-based encryption is defined in the PKCS5 Password-Based Cryptography Standard at https://tools.ietf.org/html/rfc2898. If PBE is used, the underlying encryption algorithm is specified by the PbesAlgorithm property. The underlying encryption (PbesAlgorithm) for PBES1 is limited to 56-bit DES or 64-bit RC2.

Note:The chacha20 algorithm is introduced in Chilkat v9.5.0.55.

ChaCha20 Encryption

DebugLogFilePath As String

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

EncodingMode As String

Controls the encoding of binary data to a printable string for many methods. The valid modes are "Base64", "modBase64", "base64url", "Base32", "Base58", "UU", "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", "Q", "B", "url_oauth", "url_rfc1738", "url_rfc2396", "url_rfc3986", "fingerprint", or "decimal".

The "fingerprint" and"decimal" encodings are introduced in Chilkat v9.5.0.55.

The "fingerprint" encoding is a lowercase hex encoding where each hex digit is separated by a colon character. For example: 6a:de:e0:af:56:f8:0c:04:11:5b:ef:4d:49:ad:09:23

The "decimal" encoding is for converting large decimal integers to/from a big-endian binary representation. For example, the decimal string "72623859790382856" converts to the bytes 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08.

Binary Encodings Supported by Chilkat

FirstChunk As Boolean

Chilkat Crypt2 provides the ability to feed the encryption/decryption methods with chunks of data. This allows a large amount of data, or a data stream, to be fed piecemeal for encrypting or decrypting. It applies to all symmetric algorithms currently supported (AES, Blowfish, Twofish, 3DES, RC2, DES, ARC4), and all algorithms supported in the future.

The default value for both FirstChunk and LastChunk is True. This means when an Encrypt* or Decrypt* method is called, it is both the first and last chunk (i.e. it's the entire amount of data to be encrypted or decrypted).

If you wish to feed the data piecemeal, do this:

  1. Set FirstChunk = True, LastChunk = False for the first chunk of data.
  2. For all "middle" chunks (i.e. all chunks except for the final chunk) set FirstChunk = False and LastChunk = False.
  3. For the final chunk, set FirstChunk = False and LastChunk = True

There is no need to worry about feeding data according to the block size of the encryption algorithm. For example, AES has a block size of 16 bytes. Data may be fed in chunks of any size. The Chilkat Crypt2 component will buffer the data. When the final chunk is passed, the output is padded to the algorithm's block size according to the PaddingScheme.

more info about FirstChunk/LastChunk

Encrypting/decrypting a data stream.

Encrypt File in Chunks using AES CBC

HashAlgorithm As String

Selects the hash algorithm used by methods that create hashes. The valid choices are "sha1", "sha256", "sha384", "sha512", "md2", "md5", "haval", "ripemd128", "ripemd160","ripemd256", or "ripemd320".

Note: SHA-2 designates a set of cryptographic hash functions that includes SHA-256, SHA-384, and SHA-512. Chilkat by definition supports "SHA-2" because it supports these algorithms.

Note: The HAVAL hash algorithm is affected by two other properties: HavalRounds and KeyLength.

  • The HavalRounds may have values of 3, 4, or 5.
  • The KeyLength may have values of 128, 160, 192, 224, or 256.

HavalRounds As Integer

Applies to the HAVAL hash algorithm only and must be set to the integer value 3, 4, or 5. The default value is 3.

HeartbeatMs As Integer

The number of milliseconds between each AbortCheck event callback. The AbortCheck callback allows an application to abort some methods call prior to completion. If HeartbeatMs is 0 (the default), no AbortCheck event callbacks will fire.

The methods with event callbacks are: CkDecryptFile, CkEncryptFile, HashFile, and HashFileENC.

IncludeCertChain As Boolean

Only applies when creating digital signatures. If True (the default), then additional certificates (if any) in the chain of authentication are included in the PKCS7 digital signature.

InitialCount As Integer

Introduced in version 9.5.0.55

The initial counter for the ChaCha20 encryption algorithm. The default value is 0.

IterationCount As Integer

Iteration count to be used with password-based encryption (PBE). Password-based encryption is defined in the PKCS5 Password-Based Cryptography Standard at http://www.rsa.com/rsalabs/node.asp?id=2127

The purpose of the iteration count is to increase the computation required to encrypt and decrypt. A larger iteration count makes cracking via exhaustive search more difficult. The default value is 1024.

IV As Byte()

The initialization vector to be used with symmetric encryption algorithms (AES, Blowfish, Twofish, etc.). If left unset, no initialization vector is used.

KeyLength As Integer

The key length in bits for symmetric encryption algorithms. The default value is 256.

LastChunk As Boolean

(See the description for the FirstChunk property.)

Encrypting/decrypting a data stream.

Encrypt File in Chunks using AES CBC

LastErrorHtml As String (ReadOnly)

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

LastErrorText As String (ReadOnly)

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

Concept of LastErrorText

LastErrorText Standard Information

LastErrorXml As String (ReadOnly)

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

LastMethodSuccess As Boolean

Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of True indicates success, a value of False indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = True and failure = False.
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to True. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

MacAlgorithm As String

Introduced in version 9.5.0.55

Selects the MAC algorithm to be used for any of the Mac methods, such as MacStringENC, MacBytes, etc. The default value is "hmac". Possible values are "hmac" and "poly1305".

Poly1305 MAC

Demonstrates HMAC SHA256

NumSignerCerts As Integer (ReadOnly)

This property is set when a digital signature is verified. It contains the number of signer certificates. Each signing certificate can be retrieved by calling the GetSignerCert method, passing an index from 0 to NumSignerCerts-1.

Extract PKCS7 Signature Digest

Verify Opaque Signature and Retrieve Signing Certificates

OaepHash As String

Introduced in version 9.5.0.67

Selects the hash algorithm for use within OAEP padding when encrypting using "pki" with RSAES-OAEP. The valid choices are "sha1", "sha256", "sha384", "sha512",

RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

OaepMgfHash As String

Introduced in version 9.5.0.71

Selects the MGF hash algorithm for use within OAEP padding when encrypting using "pki" with RSAES-OAEP. The valid choices are "sha1", "sha256", "sha384", "sha512", The default is "sha1".

OaepPadding As Boolean

Introduced in version 9.5.0.67

Selects the RSA encryption scheme when encrypting using "pki" (with a certificate and private key). The default value is False, which selects RSAES_PKCS1-V1_5. If set to True, then RSAES_OAEP is used.

RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

PaddingScheme As Integer

The padding scheme used by block encryption algorithms such as AES (Rijndael), Blowfish, Twofish, RC2, DES, 3DES, etc. Block encryption algorithms pad encrypted data to a multiple of algorithm's block size. The default value of this property is 0.

Possible values are:

0 = RFC 1423 padding scheme: Each padding byte is set to the number of padding bytes. If the data is already a multiple of algorithm's block size bytes, an extra block is appended each having a value equal to the block size. (for example, if the algorithm's block size is 16, then 16 bytes having the value 0x10 are added.). (This is also known as PKCS5 padding: PKCS #5 padding string consists of a sequence of bytes, each of which is equal to the total number of padding bytes added. )

1 = FIPS81 (Federal Information Processing Standards 81) where the last byte contains the number of padding bytes, including itself, and the other padding bytes are set to random values.

2 = Each padding byte is set to a random value. The decryptor must know how many bytes are in the original unencrypted data.

3 = Pad with NULLs. (If already a multiple of the algorithm's block size, no padding is added).

4 = Pad with SPACE chars(0x20). (If already a multiple of algorithm's block size, no padding is added).

PbesAlgorithm As String

If the CryptAlgorithm property is set to "pbes1" or "pbes2", this property specifies the underlying encryption algorithm to be used with password-based encryption (PBE). Password-based encryption is defined in the PKCS5 Password-Based Cryptography Standard at http://www.rsa.com/rsalabs/node.asp?id=2127

PbesPassword As String

The password to be used with password-based encryption (PBE). Password-based encryption is defined in the PKCS5 Password-Based Cryptography Standard at http://www.rsa.com/rsalabs/node.asp?id=2127

Pkcs7CryptAlg As String

When the CryptAlgorithm property is "PKI" to select PKCS7 public-key encryption, this selects the underlying symmetric encryption algorithm. Possible values are: "aes", "des", "3des", and "rc2". The default value is "aes".

RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

Rc2EffectiveKeyLength As Integer

The effective key length (in bits) for the RC2 encryption algorithm. When RC2 is used, both the KeyLength and Rc2EffectiveKeyLength properties should be set. For RC2, both should be between 8 and 1024 (inclusive).

Salt As Byte()

The salt to be used with password-based encryption (PBE). Password-based encryption is defined in the PKCS5 Password-Based Cryptography Standard at http://www.rsa.com/rsalabs/node.asp?id=2127

To clarify: This property is used in encryption when the CryptAlgorithm is set to "pbes1" or "pbes2". Also note that it is not used by the Pbkdf1 or Pbkdf2 methods, as the salt is passed in an argument to those methods.

SecretKey As Byte()

The binary secret key used for symmetric encryption (Aes, Blowfish, Twofish, ChaCha20, ARC4, 3DES, RC2, etc.). The secret key must be identical for decryption to succeed. The length in bytes of the SecretKey must equal the KeyLength/8.

Generate Encryption Key

SigningAlg As String

Introduced in version 9.5.0.67

This property selects the signature algorithm for the OpaqueSign*, Sign*, and CreateDetachedSignature, CreateP7M, and CreateP7S methods. The default value is "PKCS1-v1_5". This can be set to "RSASSA-PSS" (or simply "pss") to use the RSASSA-PSS signature scheme.

Note: This property only applies when the private key is an RSA private key. It does not apply for ECC or DSA private keys.

RSASSA-PSS Sign String to Create Base64 PCKS7 Signature

UuFilename As String

When UU encoding, this is the filename to be embedded in UU encoded output. The default is "file.dat". When UU decoding, this is the filename found in the UU encoded input.

UU Encoding and Decoding

UuMode As String

When UU encoding, this is the file permissions mode to be embedded in UU encoded output. The default is "644". When UU decoding, this property is set to the mode found in the UU encoded input.

VerboseLogging As Boolean

If set to True, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is False. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

Version As String (ReadOnly)

Version of the component/library, such as "9.5.0.63"

Methods

Sub AddEncryptCert(ByVal cert As Cert)

Adds a certificate to be used for public-key encryption. (To use public-key encryption with digital certificates, set the CryptAlgorithm property = "pki".) To encrypt with more than one certificate , call AddEncryptCert once per certificate.

Encrypt a file to a PKCS7 encrypted message using multiple certificates from different users

Function AddPfxSourceData(ByVal pfxBytes As Byte(), ByVal pfxPassword As String) As Boolean

Adds a PFX to the object's internal list of sources to be searched for certificates and private keys when decrypting. Multiple PFX sources can be added by calling this method once for each. (On the Windows operating system, the registry-based certificate stores are also automatically searched, so it is commonly not required to explicitly add PFX sources.)

The pfxBytes contains the bytes of a PFX file (also known as PKCS12 or .p12).

Returns True for success, False for failure.

Function AddPfxSourceFile(ByVal pfxFilePath As String, ByVal pfxPassword As String) As Boolean

Adds a PFX file to the object's internal list of sources to be searched for certificates and private keys when decrypting. Multiple PFX files can be added by calling this method once for each. (On the Windows operating system, the registry-based certificate stores are also automatically searched, so it is commonly not required to explicitly add PFX sources.)

The pfxFilePath contains the bytes of a PFX file (also known as PKCS12 or .p12).

Returns True for success, False for failure.

Function AesKeyUnwrap(ByVal kek As String, ByVal wrappedKeyData As String, ByVal encoding As String) As String

Introduced in version 9.5.0.66

Implements the AES Key Wrap Algorithm (RFC 3394) for unwrapping. The kek is the Key Encryption Key (the AES key used to unwrap the wrappedKeyData). The arguments and return value are binary encoded strings using the encoding specified by encoding (which can be "base64", "hex", "base64url", etc.) The full list of supported encodings is available at the link below.

The kek should be an AES key of 16 bytes, 24 bytes, or 32 bytes (i.e. 128-bits, 192- bits, or 256-bits). For example, if passed as a hex string, then the kek should be 32 chars in length, 48 chars, or 64 chars (because each byte is represented as 2 chars in hex).

The wrappedKeyData contains the data to be unwrapped. The result, if decoded, is 8 bytes less than the wrapped key data. For example, if a 256-bit AES key (32 bytes) is wrapped, the size of the wrapped key data is 40 bytes. Unwrapping restores it to the original 32 bytes.

Returns Nothing on failure

AES Key Wrap / Unwrap

Function AesKeyWrap(ByVal kek As String, ByVal keyData As String, ByVal encoding As String) As String

Introduced in version 9.5.0.66

Implements the AES Key Wrap Algorithm (RFC 3394). The kek is the Key Encryption Key (the AES key used to encrypt the keyData). The arguments and return value are binary encoded strings using the encoding specified by encoding (which can be "base64", "hex", "base64url", etc.) The full list of supported encodings is available at the link below.

The kek should be an AES key of 16 bytes, 24 bytes, or 32 bytes (i.e. 128-bits, 192- bits, or 256-bits). For example, if passed as a hex string, then the kek should be 32 chars in length, 48 chars, or 64 chars (because each byte is represented as 2 chars in hex).

The keyData contains the data to be key wrapped. It must be a multiple of 64-bits in length. In other words, if the keyData is decoded to binary, it should be a number of bytes that is a multiple of 8.

The return string, if decoded to binary bytes, is equal to the size of the key data + 8 additional bytes.

Returns Nothing on failure

AES Key Wrap / Unwrap

Function BCryptHash(ByVal password As String) As String

Introduced in version 9.5.0.65

Computes and returns a bcrypt hash of the password. The number of rounds of hashing is determined by the BCryptWorkFactor property.

Returns Nothing on failure

BCrypt Hash a Password

Function BCryptVerify(ByVal password As String, ByVal bcryptHash As String) As Boolean

Introduced in version 9.5.0.65

Verifies the password against a previously computed BCrypt hash. Returns True if the password matches the bcryptHash. Returns False if the password does not match.

Returns True for success, False for failure.

BCrypt Verify a Password (Check if Password is Correct)

Function BytesToString(ByVal inData As Byte(), ByVal charset As String) As String

Utility method to convert bytes to a string -- interpreting the bytes according to the charset specified.

Returns Nothing on failure

Function ByteSwap4321(ByVal data As Byte()) As Byte()

Convenience method for byte swapping between little-endian byte ordering and big-endian byte ordering.

Returns an empty byte array on failure

Function CkDecryptFile(ByVal srcFile As String, ByVal destFile As String) As Boolean

File-to-file decryption. There is no limit to the size of the file that can be decrypted because the component will operate in streaming mode internally.

Returns True for success, False for failure.

AES Encrypt and Decrypt a File

Function CkDecryptFileAsync(ByVal srcFile As String, ByVal destFile As String) As Task

Creates an asynchronous task to call the CkDecryptFile method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

How to Run an Asynchronous Task

Function CkEncryptFile(ByVal srcFile As String, ByVal destFile As String) As Boolean

File-to-file encryption. There is no limit to the size of the file that can be encrypted because the component will operate in streaming mode internally.

Returns True for success, False for failure.

AES Encrypt and Decrypt a File

Encrypt File using X.509 Certificate using AES in CBC Mode

Function CkEncryptFileAsync(ByVal srcFile As String, ByVal destFile As String) As Task

Creates an asynchronous task to call the CkEncryptFile method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

How to Run an Asynchronous Task

Sub ClearEncryptCerts()

Clears the internal list of digital certificates to be used for public-key encryption.

Function CompressBytes(ByVal data As Byte()) As Byte()

Bzip2 compresses a byte array and returns the compressed bytes.

This is a legacy method that should not be used in new development. It will not be marked as deprecated or removed from future APIs because existing applications may have data already compressed using this method.

The output of this method includes an 8-byte header composed of a 4-byte magic number (0xB394A7E1) and the 4-byte length of the uncompressed data.

Returns an empty byte array on failure

Function CompressBytesENC(ByVal data As Byte()) As String

Same as CompressBytes, except an encoded string is returned. The output encoding is specified by the EncodingMode property.

Returns Nothing on failure

Supported Binary Encodings

Function CompressString(ByVal str As String) As Byte()

Compresses a string and returns the compressed bytes. Prior to compressing, the string is converted to a byte representation such as utf-8, utf-16, etc. as determined by the Charset property. Otherwise, this method is the same as the CompressBytes method.

Returns an empty byte array on failure

Function CompressStringENC(ByVal str As String) As String

Compresses a string and returns the encoded compressed bytes. Prior to compressing, the string is converted to a byte representation such as utf-8, utf-16, etc. as determined by the Charset property. The output encoding is specified by the EncodingMode property. Otherwise, this method is the same as the CompressBytes method.

Returns Nothing on failure

Supported Binary Encodings

Crypt2 Compression Example

Function CrcBytes(ByVal crcAlg As String, ByVal byteData As Byte()) As UInteger

Introduced in version 9.5.0.38

Calculates a CRC for in-memory byte data. To compute the CRC used in the Zip file format, pass "CRC-32" for the crcAlg. (The crcAlg argument provides the flexibility to add additional CRC algorithms on an as-needed basis in the future.)

Function CrcFile(ByVal crcAlg As String, ByVal path As String) As UInteger

Introduced in version 9.5.0.38

Calculates a CRC for the contents of a file. To compute the CRC used in the Zip file format, pass "CRC-32" for the crcAlg. (The crcAlg argument provides the flexibility to add additional CRC algorithms on an as-needed basis in the future.) A value of 0 is returned if the file is unable to be read. Given that there is a 1 in 4 billion chance of having an actual CRC of 0, an application might choose to react to a 0 return value by testing to see if the file can be opened and read.

Function CrcFileAsync(ByVal crcAlg As String, ByVal path As String) As Task

Introduced in version 9.5.0.38

Creates an asynchronous task to call the CrcFile method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

How to Run an Asynchronous Task

Function CreateDetachedSignature(ByVal inFilePath As String, ByVal sigFilePath As String) As Boolean

Digitally signs a file and writes the digital signature to a separate output file (a PKCS#7 signature file). The input file (inFilePath) is unmodified. A certificate for signing must be specified by calling SetSigningCert or SetSigningCert2 prior to calling this method.

This method is equivalent to CreateP7S. The CreateP7S method was added to clarify the format of the signature file that is created.

Returns True for success, False for failure.

Function CreateP7M(ByVal inFilename As String, ByVal p7mPath As String) As Boolean

Digitally signs a file and creates a .p7m (PKCS #7 Message) file that contains both the signature and original file content. The input file (inFilename) is unmodified. A certificate for signing must be specified by calling SetSigningCert or SetSigningCert2 prior to calling this method.

To sign with a particular hash algorithm, set the HashAlgorithm property. Valid hash algorithms for signing are "sha256", "sha1", "sha384", "sha512", "md5", and "md2".

Returns True for success, False for failure.

CAdES BES Attached (Opaque) Signature

Examine the Contents of a .p7m by Converting to XML

Create P7M Using Pre-Installed Windows Certificate

Function CreateP7S(ByVal inFilename As String, ByVal p7sPath As String) As Boolean

Digitally signs a file and creates a .p7s (PKCS #7 Signature) signature file. The input file (inFilename) is unmodified. The output file (p7sPath) contains only the signature and not the original data. A certificate for signing must be specified by calling SetSigningCert or SetSigningCert2 prior to calling this method.

To sign with a particular hash algorithm, set the HashAlgorithm property. Valid hash algorithms for signing are "sha256", "sha1", "sha384", "sha512", "md5", and "md2".

Returns True for success, False for failure.

CAdES BES Detached Signature

Function Decode(ByVal str As String, ByVal encoding As String) As Byte()

Decode binary data from an encoded string. The encoding can be set to any of the following strings: "base64", "hex", "quoted-printable", "url", "base32", "Q", "B", "url_rc1738", "url_rfc2396", "url_rfc3986", "url_oauth", "uu", "modBase64", or "html" (for HTML entity encoding).

Returns an empty byte array on failure

Function DecodeString(ByVal inStr As String, ByVal charset As String, ByVal encoding As String) As String

Decodes from an encoding back to the original string. The encoding can be set to any of the following strings: "base64", "hex", "quoted-printable", "url", "base32", "Q", "B", "url_rc1738", "url_rfc2396", "url_rfc3986", "url_oauth", "uu", "modBase64", or "html" (for HTML entity encoding).

Returns Nothing on failure

UU Encoding and Decoding

Function DecryptBd(ByVal bd As BinData) As Boolean

Introduced in version 9.5.0.67

In-place decrypts the contents of bd. The minimal set of properties that should be set before decrypting are: CryptAlgorithm, SecretKey. Other properties that control encryption are: CipherMode, PaddingScheme, KeyLength, IV.

Returns True for success, False for failure.

Example for both AES-128 and ChaCha20 to Encrypt Binary Data

RSAES-OAEP Encrypt/Decrypt Binary Data with AES-128 and SHA56

openssl enc decrypt

Function DecryptBytes(ByVal data As Byte()) As Byte()

Decrypts a byte array and returns the unencrypted byte array. The property settings used when encrypting the data must match the settings when decrypting. Specifically, the CryptAlgorithm, CipherMode, PaddingScheme, KeyLength, IV, and SecretKey properties must match.

Returns an empty byte array on failure

Function DecryptBytesENC(ByVal str As String) As Byte()

Decrypts string-encoded encrypted data and returns the unencrypted byte array. Data encrypted with EncryptBytesENC can be decrypted with this method. The property settings used when encrypting the data must match the settings when decrypting. Specifically, the EncodingMode, CryptAlgorithm, CipherMode, PaddingScheme, KeyLength, IV, and SecretKey properties must match.

Returns an empty byte array on failure

Supported Binary Encodings

Function DecryptEncoded(ByVal encodedEncryptedData As String) As String

Encrypted data is passed to this method as an encoded string (base64, hex, etc.). This method first decodes the input data according to the EncodingMode property setting. It then decrypts and re-encodes using the EncodingMode setting, and returns the decrypted data in encoded string form.

Returns Nothing on failure

AEAD AES 128-bit GCM

Function DecryptSb(ByVal bdIn As BinData, ByVal sbOut As StringBuilder) As Boolean

Introduced in version 9.5.0.67

Decrypts the contents of bdIn to sbOut. The decrypted string is appended to sbOut. The minimal set of properties that should be set before ecrypting are: CryptAlgorithm, SecretKey. Other properties that control encryption are: CipherMode, PaddingScheme, KeyLength, IV.

Returns True for success, False for failure.

AES and CHACHA20 Encrypt/Decrypt Text

Function DecryptSecureENC(ByVal cipherText As String, ByVal secureStr As SecureString) As Boolean

Introduced in version 9.5.0.71

Identical to DecryptStringENC, except the decrypts the cipherText and appends the decrypted string to the secureStr.

Returns True for success, False for failure.

Encrypt / Decrypt Secure Strings

Function DecryptStream(ByVal strm As Stream) As Boolean

Introduced in version 9.5.0.56

Decrypts a stream. Internally, the strm's source is read, decrypted, and the decrypted data written to the strm's sink. It does this in streaming fashion. Extremely large or even infinite streams can be decrypted with stable ungrowing memory usage.

Returns True for success, False for failure.

Streaming Encryption

Function DecryptStreamAsync(ByVal strm As Stream) As Task

Introduced in version 9.5.0.56

Creates an asynchronous task to call the DecryptStream method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

How to Run an Asynchronous Task

Function DecryptString(ByVal data As Byte()) As String

The reverse of EncryptString.

Decrypts encrypted byte data and returns the original string. The property settings used when encrypting the string must match the settings when decrypting. Specifically, the Charset, CryptAlgorithm, CipherMode, PaddingScheme, KeyLength, IV, and SecretKey properties must match.

Returns Nothing on failure

Explaining the Importance of the Charset

Function DecryptStringENC(ByVal str As String) As String

The reverse of EncryptStringENC.

Decrypts string-encoded encrypted data and returns the original string. The property settings used when encrypting the string must match the settings when decrypting. Specifically, the Charset, EncodingMode, CryptAlgorithm, CipherMode, PaddingScheme, KeyLength, IV, and SecretKey properties must match.

Returns Nothing on failure

Explaining the Importance of the Charset

Supported Binary Encodings

Function Encode(ByVal byteData As Byte(), ByVal encoding As String) As String

Encode binary data to base64, hex, quoted-printable, or URL-encoding. The encoding can be set to any of the following strings: "base64", "hex", "quoted-printable" (or "qp"), "url", "base32", "Q", "B", "url_rc1738", "url_rfc2396", "url_rfc3986", "url_oauth", "uu", "modBase64", or "html" (for HTML entity encoding).

Returns Nothing on failure

Function EncodeString(ByVal strToEncode As String, ByVal charsetName As String, ByVal toEncodingName As String) As String

Encodes a string. The toEncodingName can be set to any of the following strings: "base64", "hex", "quoted-printable", "url", "base32", "Q", "B", "url_rc1738", "url_rfc2396", "url_rfc3986", "url_oauth", "uu", "modBase64", or "html" (for HTML entity encoding). The charsetName is important, and usually you'll want to specify "ansi". For example, if the string "ABC" is to be encoded to "hex" using ANSI, the result will be "414243". However, if "unicode" is used, the result is "410042004300".

Returns Nothing on failure

Supported Binary Encodings

Function EncryptBd(ByVal bd As BinData) As Boolean

Introduced in version 9.5.0.67

In-place encrypts the contents of bd. The minimal set of properties that should be set before encrypting are: CryptAlgorithm, SecretKey. Other properties that control encryption are: CipherMode, PaddingScheme, KeyLength, IV. When decrypting, all property settings must match otherwise the result is garbled data.

Returns True for success, False for failure.

Example for both AES-128 and ChaCha20 to Encrypt Binary Data

RSAES-OAEP Encrypt/Decrypt Binary Data with AES-128 and SHA56

Function EncryptBytes(ByVal data As Byte()) As Byte()

Encrypts a byte array. The minimal set of properties that should be set before encrypting are: CryptAlgorithm, SecretKey. Other properties that control encryption are: CipherMode, PaddingScheme, KeyLength, IV. When decrypting, all property settings must match otherwise garbled data is returned.

Returns an empty byte array on failure

Function EncryptBytesENC(ByVal data As Byte()) As String

Encrypts a byte array and returns the encrypted data as an encoded (printable) string. The minimal set of properties that should be set before encrypting are: CryptAlgorithm, SecretKey, EncodingMode. Other properties that control encryption are: CipherMode, PaddingScheme, KeyLength, IV. When decrypting, all property settings must match otherwise garbled data is returned. The encoding of the string that is returned is controlled by the EncodingMode property, which can be set to "Base64", "QP", or "Hex".

Returns Nothing on failure

Supported Binary Encodings

Function EncryptEncoded(ByVal str As String) As String

The input string is first decoded according to the encoding algorithm specified by the EncodingMode property (such as base64, hex, etc.) It is then encrypted according to the encryption algorithm specified by CryptAlgorithm. The resulting encrypted data is encoded (using EncodingMode) and returned.

Returns Nothing on failure

AEAD AES 128-bit GCM

Function EncryptSb(ByVal sbIn As StringBuilder, ByVal bdOut As BinData) As Boolean

Introduced in version 9.5.0.67

Encrypts the contents of sbIn to bdOut. The minimal set of properties that should be set before ecrypting are: CryptAlgorithm, SecretKey. Other properties that control encryption are: CipherMode, PaddingScheme, KeyLength, IV.

Returns True for success, False for failure.

AES and CHACHA20 Encrypt/Decrypt Text

Function EncryptSecureENC(ByVal secureStr As SecureString) As String

Introduced in version 9.5.0.71

Identical to EncryptStringENC, except the clear-text contained within the secureStr is encrypted and returned.

Returns Nothing on failure

Encrypt / Decrypt Secure Strings

Function EncryptStream(ByVal strm As Stream) As Boolean

Introduced in version 9.5.0.56

Encrypts a stream. Internally, the strm's source is read, encrypted, and the encrypted data written to the strm's sink. It does this in streaming fashion. Extremely large or even infinite streams can be encrypted with stable ungrowing memory usage.

Returns True for success, False for failure.

Streaming Encryption

Function EncryptStreamAsync(ByVal strm As Stream) As Task

Introduced in version 9.5.0.56

Creates an asynchronous task to call the EncryptStream method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

How to Run an Asynchronous Task

Function EncryptString(ByVal str As String) As Byte()

Encrypts a string and returns the encrypted data as a byte array. The minimal set of properties that should be set before encrypting are: CryptAlgorithm, SecretKey, Charset. Other properties that control encryption are: CipherMode, PaddingScheme, KeyLength, IV. When decrypting, all property settings must match otherwise garbled data is returned. The Charset property controls the exact bytes that get encrypted. Languages such as VB.NET, C#, and Visual Basic work with Unicode strings, thus the input string is Unicode. If Unicode is to be encrypted (i.e. 2 bytes per character) then set the Charset property to "Unicode". To implicitly convert the string to another charset before the encryption is applied, set the Charset property to something else, such as "iso-8859-1", "Shift_JIS", "big5", "windows-1252", etc. The complete list of possible charsets is listed here:


us-ascii
unicode
unicodefffe
iso-8859-1
iso-8859-2
iso-8859-3
iso-8859-4
iso-8859-5
iso-8859-6
iso-8859-7
iso-8859-8
iso-8859-9
iso-8859-13
iso-8859-15
windows-874
windows-1250
windows-1251
windows-1252
windows-1253
windows-1254
windows-1255
windows-1256
windows-1257
windows-1258
utf-7
utf-8
utf-32
utf-32be
shift_jis
gb2312
ks_c_5601-1987
big5
iso-2022-jp
iso-2022-kr
euc-jp
euc-kr
macintosh
x-mac-japanese
x-mac-chinesetrad
x-mac-korean
x-mac-arabic
x-mac-hebrew
x-mac-greek
x-mac-cyrillic
x-mac-chinesesimp
x-mac-romanian
x-mac-ukrainian
x-mac-thai
x-mac-ce
x-mac-icelandic
x-mac-turkish
x-mac-croatian
asmo-708
dos-720
dos-862
ibm037
ibm437
ibm500
ibm737
ibm775
ibm850
ibm852
ibm855
ibm857
ibm00858
ibm860
ibm861
ibm863
ibm864
ibm865
cp866
ibm869
ibm870
cp875
koi8-r
koi8-u

Returns an empty byte array on failure

Explaining the Importance of the Charset

Function EncryptStringENC(ByVal str As String) As String

Encrypts a string and returns the encrypted data as an encoded (printable) string. The minimal set of properties that should be set before encrypting are: CryptAlgorithm, SecretKey, Charset, and EncodingMode. Other properties that control encryption are: CipherMode, PaddingScheme, KeyLength, IV. When decrypting (with DecryptStringENC), all property settings must match otherwise garbled data is returned. The Charset property controls the exact bytes that get encrypted. Languages such as VB.NET, C#, and Visual Basic work with Unicode strings, thus the input string is Unicode. If Unicode is to be encrypted (i.e. 2 bytes per character) then set the Charset property to "Unicode". To implicitly convert the string to another charset before the encryption is applied, set the Charset property to something else, such as "iso-8859-1", "Shift_JIS", "big5", "windows-1252", etc. (Refer to EncryptString for the complete list of charsets.)

The EncodingMode property controls the encoding of the string that is returned. It can be set to "Base64", "QP", or "Hex".

Returns Nothing on failure

AES Encryption Example

Blowfish Encryption Example

3DES Encryption Example

ARC4 Encryption Example

PBES1 Password-Based Encryption

PBES2 Password-Based Encryption

RC2 Encryption Example

Twofish Encryption Example

Explaining the Importance of the Charset

Supported Binary Encodings

Binary Encodings Supported by Chilkat

Function GenEncodedSecretKey(ByVal password As String, ByVal encoding As String) As String

Important: In the v9.5.0.49 release, a bug involving this method was introduced: The encoding is ignored and instead the encoding used is the current value of the EncodingMode property. The workaround is to make sure the EncodingMode property is set to the value of the desired output encoding. This problem will be fixed in v9.5.0.50.

Identical to the GenerateSecretKey method, except it returns the binary secret key as a string encoded according to encoding, which may be "base64", "hex", "url", etc. Please see the documentation for GenerateSecretKey for more information.

Returns Nothing on failure

Function GenerateSecretKey(ByVal password As String) As Byte()

Hashes a string to a byte array that has the same number of bits as the current value of the KeyLength property. For example, if KeyLength is equal to 128 bits, then a 16-byte array is returned. This can be used to set the SecretKey property. In order to decrypt, the SecretKey must match exactly. To use "password-based" encryption, the password is passed to this method to generate a binary secret key that can then be assigned to the SecretKey property.

IMPORTANT: If you are trying to decrypt something encrypted by another party such that the other party provided you with the secret key, DO NOT use this method. This method is for transforming an arbitrary-length password into a binary secret key of the proper length. Please see this Chilkat blog post: Getting Started with AES Decryption

Returns an empty byte array on failure

Deriving a 256-bit AES Secret Key from a Password Using SHA256

PBKDF2 - Derive Key from Password

Function GenerateUuid() As String

Introduced in version 9.5.0.55

Generates a random UUID string having standard UUID format, such as "de305d54-75b4-431b-adb2-eb6b9e546014".

Note: This generates a "version 4 UUID" using random byte values. See RFC 4122.

Returns Nothing on failure

Generate UUID

Function GenRandomBytesENC(ByVal numBytes As Integer) As String

Generates numBytes random bytes and returns them as an encoded string. The encoding, such as base64, hex, etc. is controlled by the EncodingMode property.

Returns Nothing on failure

Supported Binary Encodings

Function GetDecryptCert() As Cert

Introduced in version 9.5.0.46

Returns the last certificate used for public-key decryption.

Returns Nothing on failure

Function GetEncodedAad(ByVal encoding As String) As String

Introduced in version 9.5.0.55

Returns the authenticated additional data as an encoded string. The encoding argument can be set to any of the following strings: "base64", "hex", "quoted-printable", or "url".

The Aad is used when the CipherMode is "gcm" (Galois/Counter Mode), which is a mode valid for symmetric ciphers that have a block size of 16 bytes, such as AES or Twofish.

Returns Nothing on failure

AEAD AES 128-bit GCM

Function GetEncodedAuthTag(ByVal encoding As String) As String

Introduced in version 9.5.0.55

Returns the authentication tag as an encoded string. The encoding argument may be set to any of the following strings: "base64", "hex", "quoted-printable", or "url". The authentication tag is an output of authenticated encryption modes such as GCM when encrypting. When GCM mode decrypting, the authenticate tag is set by the application and is the expected result.

The authenticated tag plays a role when the CipherMode is "gcm" (Galois/Counter Mode), which is a mode valid for symmetric block ciphers that have a block size of 16 bytes, such as AES or Twofish.

Returns Nothing on failure

AEAD AES 128-bit GCM

Function GetEncodedIV(ByVal encoding As String) As String

Returns the initialization vector as an encoded string. The encoding argument can be set to any of the following strings: "base64", "hex", "quoted-printable", or "url".

Returns Nothing on failure

Function GetEncodedKey(ByVal encoding As String) As String

Returns the secret key as an encoded string. The encoding argument can be set to any of the following strings: "base64", "hex", "quoted-printable", or "url".

Returns Nothing on failure

Function GetEncodedSalt(ByVal encoding As String) As String

Returns the password-based encryption (PBE) salt bytes as an encoded string. The encoding argument can be set to any of the following strings: "base64", "hex", "quoted-printable", or "url".

Returns Nothing on failure

Function GetLastCert() As Cert

Returns the last certificate used when verifying a signature. This method is deprecated. Applications should instead call GetSignerCert with an index of 0.

Returns Nothing on failure

Function GetSignatureSigningTime(ByVal index As Integer) As Date

This method is deprecated. It will be removed in a future version.

This method can be called after a digital signature is verified to retrieve the signing time of the Nth certificate used for signing. The 1st certificate/signing time is at index 0. The NumSignerCerts property contains the total number of signing certificates. (Typically, a single certificate is used in creating a digital signature.)

Note: An application should first check to see if a signing date/time is available for the Nth certificate by calling the HasSignatureSigningTime method. The indices for which there is no signing time available should be skipped.

Function GetSignatureSigningTimeStr(ByVal index As Integer) As String

The same as GetSignatureSigningTime, except the date/time is returned in RFC822 string format.

Returns Nothing on failure

Function GetSignerCert(ByVal index As Integer) As Cert

Gets the Nth certificate used for signing. This method can be called after verifying a digital signature to get the signer certs. The 1st certificate is at index 0. The NumSignerCerts property contains the total number of signing certificates. (Typically, a single certificate is used in creating a digital signature.)

Returns Nothing on failure

Verify Opaque Signature and Retrieve Signing Certificates

Function GetSignerCertChain(ByVal index As Integer) As CertChain

Introduced in version 9.5.0.40

Returns the full certificate chain for the Nth certificate used to for signing. Indexing begins at 0.

Returns Nothing on failure

Verify Opaque Signature and Retrieve Signing Certificates

Function HashBdENC(ByVal bd As BinData) As String

Introduced in version 9.5.0.66

Hashes the the bytes contained in bd and returns the hash as an encoded string.

The hash algorithm is specified by the HashAlgorithm property, The encoding is controlled by the EncodingMode property, which can be set to "base64", "hex", "base64url", or any of the encodings listed at the link below.

Returns Nothing on failure

Binary Encodings Supported by Chilkat

SOAP WS-Security UsernameToken

Function HashBeginBytes(ByVal data As Byte()) As Boolean

Begin hashing a byte stream. Call this method to hash the 1st chunk. Additional chunks are hashed by calling HashMoreBytes 0 or more times followed by a final call to HashFinal (or HashFinalENC) to retrieve the result. The hash algorithm is selected by the HashAlgorithm property setting.

Returns True for success, False for failure.

Function HashBeginString(ByVal strData As String) As Boolean

Begin hashing a text stream. Call this method to hash the 1st chunk. Additional chunks are hashed by calling HashMoreString 0 or more times followed by a final call to HashFinal (or HashFinalENC) to retrieve the result. The hash algorithm is selected by the HashAlgorithm property setting.

Returns True for success, False for failure.

Function HashBytes(ByVal data As Byte()) As Byte()

Hashes a byte array.

The hash algorithm is specified by the HashAlgorithm property, The encoding is controlled by the EncodingMode property, which can be set to "base64", "hex", "base64url", or any of the encodings listed at the link below.

Returns an empty byte array on failure

Hash Binary Data (SHA256 and other hash algorithms)

Function HashBytesENC(ByVal data As Byte()) As String

Hashes a byte array and returns the hash as an encoded string.

The hash algorithm is specified by the HashAlgorithm property, The encoding is controlled by the EncodingMode property, which can be set to "base64", "hex", "base64url", or any of the encodings listed at the link below.

Returns Nothing on failure

Supported Binary Encodings

Hash Binary Data (SHA256 and other hash algorithms)

Function HashFile(ByVal path As String) As Byte()

Hashes a file and returns the hash bytes.

The hash algorithm is specified by the HashAlgorithm property,

Any size file may be hashed because the file is hashed internally in streaming mode (keeping memory usage low and constant).

Returns an empty byte array on failure

Hash the Contents of a File (SHA256 and other hash algorithms)

Function HashFileAsync(ByVal path As String) As Task

Creates an asynchronous task to call the HashFile method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

How to Run an Asynchronous Task

Function HashFileENC(ByVal path As String) As String

Hashes a file and returns the hash as an encoded string.

The hash algorithm is specified by the HashAlgorithm property, The encoding is controlled by the EncodingMode property, which can be set to "base64", "hex", "base64url", or any of the encodings listed at the link below.

Any size file is supported because the file is hashed internally in streaming mode (keeping memory usage low and constant).

Returns Nothing on failure

Compute Hash for a File (Example)

Supported Binary Encodings

Function HashFileENCAsync(ByVal path As String) As Task

Creates an asynchronous task to call the HashFileENC method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nothing on failure

How to Run an Asynchronous Task

Function HashFinal() As Byte()

Finalizes a multi-step hash computation and returns the hash bytes.

Returns an empty byte array on failure

Function HashFinalENC() As String

Finalizes a multi-step hash computation and returns the hash bytes encoded according to the EncodingMode property setting.

Returns Nothing on failure

Supported Binary Encodings

Function HashMoreBytes(ByVal data As Byte()) As Boolean

Adds more bytes to the hash currently under computation. (See HashBeginBytes)

Returns True for success, False for failure.

Function HashMoreString(ByVal strData As String) As Boolean

Adds more text to the hash currently under computation. (See HashBeginString)

Returns True for success, False for failure.

Function HashString(ByVal str As String) As Byte()

Hashes a string and returns a binary hash. The hash algorithm is specified by the HashAlgorithm property,

The Charset property controls the character encoding of the string that is hashed. Languages such as VB.NET, C#, and Visual Basic work with Unicode strings. If it is desired to hash Unicode directly (2 bytes/char) then set the Charset property to "Unicode". To implicitly convert to another charset before hashing, set the Charset property to the desired charset. For example, if Charset is set to "iso-8859-1", the input string is first implicitly converted to iso-8859-1 (1 byte per character) before hashing. The full list fo supported charsets is listed in the EncryptString method description.

IMPORTANT: Hash algorithms hash bytes. Changing the bytes passed to a hash algorithm changes the result. A character (i.e. a visible glyph) can have different byte representations. The byte representation is defined by the Charset. For example, 'A' in us-ascii is a single byte 0x41, whereas in utf-16 it is 2 bytes (0x41 0x00). The byte representation should be explicitly specified, otherwise unexpected results may occur.

Returns an empty byte array on failure

Hash the Contents of a String (SHA256 and other hash algorithms)

Function HashStringENC(ByVal str As String) As String

Hashes a string and returns the hash bytes as an encoded string.

The hash algorithm is specified by the HashAlgorithm property, The encoding is controlled by the EncodingMode property, which can be set to "base64", "hex", "base64url", or any of the encodings listed at the link below.

The Charset property controls the character encoding of the string that is hashed. Languages such as VB.NET, C#, and Visual Basic work with Unicode strings. If it is desired to hash Unicode directly (2 bytes/char) then set the Charset property to "Unicode". To implicitly convert to another charset before hashing, set the Charset property to the desired charset. For example, if Charset is set to "iso-8859-1", the input string is first implicitly converted to iso-8859-1 (1 byte per character) before hashing. The full list of supported charsets is listed in the EncryptString method description.

Returns Nothing on failure

Supported Binary Encodings

Function HasSignatureSigningTime(ByVal index As Integer) As Boolean

This method can be called after a digital signature has been verified by one of the Verify* methods. Returns True if a signing time for the Nth certificate is available and can be retrieved by either the GetSignatureSigningTime or GetSignatureSigningTimeStr methods.

Function HmacBytes(ByVal inBytes As Byte()) As Byte()

This method is deprecated. It will be removed in a future version.

Computes a keyed-Hash Message Authentication Code (HMAC or KHMAC), which is a type of message authentication code (MAC) calculated using a specific algorithm involving a cryptographic hash function in combination with a secret key. As with any MAC, it may be used to simultaneously verify both the data integrity and the authenticity of a message. Any iterative cryptographic hash function, such as MD5, SHA-1, SHA256, or any of the hash algorithms listed in the HashAlgorithm property, may be used in the calculation of an HMAC; the resulting MAC algorithm is termed HMAC-MD5, HMAC-SHA-1, etc. accordingly. The cryptographic strength of the HMAC depends upon the cryptographic strength of the underlying hash function, on the size and quality of the key and the size of the hash output length in bits.

The secret key is set by calling one of the following methods prior to calling this method: SetHmacKeyBytes, SetHmacKeyEncoded, or SetHmacKeyString.

The hash algorithm is specified by the HashAlgorithm property.

Note: If using Chilkat v9.5.0.55 or later, update your programs to use MacBytes instead (with the MacAlgorithm property set to "hmac").

Returns an empty byte array on failure

Function HmacBytesENC(ByVal inBytes As Byte()) As String

This method is deprecated. It will be removed in a future version.

Computes an HMAC using a secret key and hash algorithm. The result is encoded to a string using the encoding (base64, hex, etc.) specified by the EncodingMode property.

The secret key is set by calling one of the following methods prior to calling this method: SetHmacKeyBytes, SetHmacKeyEncoded, or SetHmacKeyString.

The hash algorithm is specified by the HashAlgorithm property.

Note: If using Chilkat v9.5.0.55 or later, update your programs to use MacBytesEnc instead (with the MacAlgorithm property set to "hmac").

Returns Nothing on failure

Function HmacString(ByVal inText As String) As Byte()

This method is deprecated. It will be removed in a future version.

Computes an HMAC using a secret key and hash algorithm.

The secret key is set by calling one of the following methods prior to calling this method: SetHmacKeyBytes, SetHmacKeyEncoded, or SetHmacKeyString.

The hash algorithm is specified by the HashAlgorithm property.

Note: If using Chilkat v9.5.0.55 or later, update your programs to use MacString instead (with the MacAlgorithm property set to "hmac").

Returns an empty byte array on failure

Function HmacStringENC(ByVal inText As String) As String

This method is deprecated. It will be removed in a future version.

Computes an HMAC using a secret key and hash algorithm. The result is encoded to a string using the encoding (base64, hex, etc.) specified by the EncodingMode property.

The secret key is set by calling one of the following methods prior to calling this method: SetHmacKeyBytes, SetHmacKeyEncoded, or SetHmacKeyString.

The hash algorithm is specified by the HashAlgorithm property.

Note: If using Chilkat v9.5.0.55 or later, update your programs to use MacStringENC instead (with the MacAlgorithm property set to "hmac").

Returns Nothing on failure

Function InflateBytes(ByVal data As Byte()) As Byte()

Decompresses data that was compressed with CompressBytes.

This is a legacy method that should not be used in new development. It will not be marked as deprecated or removed from future APIs because existing applications may have data already compressed using CompressBytes.

This method expects the input to begin with an 8-byte header composed of a 4-byte magic number (0xB394A7E1) and the 4-byte length of the uncompressed data.

Returns an empty byte array on failure

Function InflateBytesENC(ByVal str As String) As Byte()

The opposite of CompressBytesENC. The EncodingMode and CompressionAlgorithm properties should match what was used when compressing.

Returns an empty byte array on failure

Supported Binary Encodings

Function InflateString(ByVal data As Byte()) As String

The opposite of CompressString. The Charset and CompressionAlgorithm properties should match what was used when compressing.

Returns Nothing on failure

Function InflateStringENC(ByVal str As String) As String

The opposite of CompressStringENC. The Charset, EncodingMode, and CompressionAlgorithm properties should match what was used when compressing.

Returns Nothing on failure

Crypt2 Compression Example

Function IsUnlocked() As Boolean

Returns true if the component is unlocked.

Function LastJsonData() As JsonObject

Introduced in version 9.5.0.70

Provides information about what transpired in the last method called. For many methods, there is no information. For some methods, details about what transpired can be obtained via LastJsonData. For example, after calling a method to verify a signature, the LastJsonData will return JSON with details about the algorithms used for signature verification.

Returns Nothing on failure

Function MacBdENC(ByVal bd As BinData) As String

Introduced in version 9.5.0.66

Computes a Message Authentication Code on the bytes contained in bd, using the MAC algorithm specified in the MacAlgorithm property. The result is encoded to a string using the encoding (base64, hex, etc.) specified by the EncodingMode property.

Returns Nothing on failure

Function MacBytes(ByVal inBytes As Byte()) As Byte()

Introduced in version 9.5.0.55

Computes a Message Authentication Code using the MAC algorithm specified in the MacAlgorithm property.

Returns an empty byte array on failure

Demonstrates the MacBytes Method

Function MacBytesENC(ByVal inBytes As Byte()) As String

Computes a Message Authentication Code using the MAC algorithm specified in the MacAlgorithm property. The result is encoded to a string using the encoding (base64, hex, etc.) specified by the EncodingMode property.

Returns Nothing on failure

Demonstrates the MacBytesENC Method

Function MacString(ByVal inText As String) As Byte()

Introduced in version 9.5.0.55

Computes a Message Authentication Code using the MAC algorithm specified in the MacAlgorithm property.

Returns an empty byte array on failure

Demonstrates the MacString Method

Function MacStringENC(ByVal inText As String) As String

Introduced in version 9.5.0.55

Computes a Message Authentication Code using the MAC algorithm specified in the MacAlgorithm property. The result is encoded to a string using the encoding (base64, hex, etc.) specified by the EncodingMode property.

Returns Nothing on failure

Demonstrates HMAC SHA256

Function MySqlAesDecrypt(ByVal strEncryptedHex As String, ByVal strPassword As String) As String

Matches MySQL's AES_DECRYPT function. strEncryptedHex is a hex-encoded string of the AES encrypted data. The return value is the original unencrypted string.

Returns Nothing on failure

Function MySqlAesEncrypt(ByVal strData As String, ByVal strPassword As String) As String

Matches MySQL's AES_ENCRYPT function. The return value is a hex-encoded string of the encrypted data. The equivalent call in MySQL would look like this: HEX(AES_ENCRYPT('The quick brown fox jumps over the lazy dog','password'))

Returns Nothing on failure

Match MySQL AES_ENCRYPT Function

Function OpaqueSignBd(ByVal bd As BinData) As Boolean

Introduced in version 9.5.0.67

In-place signs the contents of bd. The contents of bd is replaced with the PKCS7/CMS format signature that embeds the data that was signed.

Returns True for success, False for failure.

RSASSA-PSS Sign Binary Data

Function OpaqueSignBytes(ByVal data As Byte()) As Byte()

Digitally signs a byte array and returns a PKCS7/CMS format signature. This is a signature that contains both the original data as well as the signature. A certificate must be set by calling SetSigningCert prior to calling this method.

Returns an empty byte array on failure

Function OpaqueSignBytesENC(ByVal data As Byte()) As String

Digitally signs a byte array and returns a PKCS7/CMS format signature in encoded string format (such as Base64 or hex). This is a signature that contains both the original data as well as the signature. A certificate must be set by calling SetSigningCert prior to calling this method. The EncodingMode property controls the output encoding, which can be "Base64", "QP","Hex", etc. (See the EncodingMode property.)

Returns Nothing on failure

Supported Binary Encodings

Function OpaqueSignString(ByVal str As String) As Byte()

Digitally signs a string and returns a PKCS7/CMS format signature. This is a signature that contains both the original data as well as the signature. A certificate must be set by calling SetSigningCert prior to calling this method. The Charset property controls the character encoding of the string that is signed. (Languages such as VB.NET, C#, and Visual Basic work with Unicode strings.) To sign Unicode data (2 bytes per char), set the Charset property to "Unicode". To implicitly convert the string to a mutlibyte charset such as "iso-8859-1", "Shift_JIS", "utf-8", or something else, then set the Charset property to the name of the charset before signing. The complete list of charsets is listed in the EncryptString method description.

Returns an empty byte array on failure

Function OpaqueSignStringENC(ByVal str As String) As String

Digitally signs a string and returns a PKCS7/CMS format signature in encoded string format (such as base64 or hex). This is a signature that contains both the original data as well as the signature. A certificate must be set by calling SetSigningCert prior to calling this method. The Charset property controls the character encoding of the string that is signed. (Languages such as VB.NET, C#, and Visual Basic work with Unicode strings.) To sign Unicode data (2 bytes per char), set the Charset property to "Unicode". To implicitly convert the string to a mutlibyte charset such as "iso-8859-1", "Shift_JIS", "utf-8", or something else, then set the Charset property to the name of the charset before signing. The complete list of charsets is listed in the EncryptString method description.

The EncodingMode property controls the output encoding, which can be "Base64", "QP","Hex", etc. (See the EncodingMode property.)

Returns Nothing on failure

Supported Binary Encodings

Create and Verify an Opaque PKCS7/CMS Signature

Function OpaqueVerifyBd(ByVal bd As BinData) As Boolean

Introduced in version 9.5.0.67

In-place verifies and unwraps the PKCS7/CMS contents of bd. If the signature is verified, the contents of bd will be replaced with the original data, and the method returns True. If the signature is not verified, then the contents of bd remain unchanged and the method returns False.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Returns True for success, False for failure.

RSASSA-PSS Sign Binary Data

Function OpaqueVerifyBytes(ByVal p7s As Byte()) As Byte()

Verifies an opaque signature and returns the original data. If the signature verification fails, the returned data will be 0 bytes in length.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Returns an empty byte array on failure

Function OpaqueVerifyBytesENC(ByVal p7s As String) As Byte()

Verifies an opaque signature (encoded in string form) and returns the original data. If the signature verification fails, the returned data will be 0 bytes in length.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Returns an empty byte array on failure

Supported Binary Encodings

Function OpaqueVerifyString(ByVal p7s As Byte()) As String

Verifies an opaque signature and returns the original string. If the signature verification fails, the returned string will be 0 characters in length.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Returns Nothing on failure

Function OpaqueVerifyStringENC(ByVal p7s As String) As String

Verifies an opaque signature (encoded in string form) and returns the original data string. If the signature verification fails, the returned string will be 0 characters in length.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Returns Nothing on failure

Supported Binary Encodings

Create and Verify an Opaque PKCS7/CMS Signature

Function Pbkdf1(ByVal password As String, ByVal charset As String, ByVal hashAlg As String, ByVal salt As String, ByVal iterationCount As Integer, ByVal outputKeyBitLen As Integer, ByVal encoding As String) As String

Implements the PBKDF1 algorithm (Password Based Key Derivation Function #1). The password is converted to the character encoding represented by charset before being passed (internally) to the key derivation function. The hashAlg may be "md5", "sha1", "md2", etc. The salt should be random data at least 8 bytes (64 bits) in length. (The GenRandomBytesENC method is good for generating a random salt value.) The iterationCount should be no less than 1000. The length (in bits) of the derived key output by this method is controlled by outputKeyBitLen. The encoding argument may be "base64", "hex", etc. It controls the encoding of the output, and the expected encoding of the salt. The derived key is returned.

Note: Starting in version 9.5.0.47, if the charset is set to one of the keywords "hex" or "base64", then the password will be considered binary data that is hex or base64 encoded. The bytes will be decoded and used directly as a binary password.

Returns Nothing on failure

PBKDF1 - Derive Key from Password

Function Pbkdf2(ByVal password As String, ByVal charset As String, ByVal hashAlg As String, ByVal salt As String, ByVal iterationCount As Integer, ByVal outputKeyBitLen As Integer, ByVal encoding As String) As String

Implements the PBKDF2 algorithm (Password Based Key Derivation Function #2). The password is converted to the character encoding represented by charset before being passed (internally) to the key derivation function. The hashAlg may be "sha256", "sha384", "sha512", "md5", "sha1", "md2", or any hash algorithm listed in the HashAlgorithm property. The salt should be random data at least 8 bytes (64 bits) in length. (The GenRandomBytesENC method is good for generating a random salt value.) The iterationCount should be no less than 1000. The length (in bits) of the derived key output by this method is controlled by outputKeyBitLen. The encoding argument may be "base64", "hex", etc. It controls the encoding of the output, and the expected encoding of the salt. The derived key is returned.

Note: The PBKDF2 function (internally) utilizes a PRF that is a pseudorandom function that is a keyed HMAC. The hash algorithm specified by hashAlg determines this PRF. If hashAlg is "SHA256", then HMAC-SHA256 is used for the PRF. Likewise, if the hash function is "SHA1", then HMAC-SHA1 is used. HMAC can be used with any hash algorithm.

Note: Starting in version 9.5.0.47, if the charset is set to one of the keywords "hex" or "base64", then the password will be considered binary data that is hex or base64 encoded. The bytes will be decoded and used directly as a binary password.

Returns Nothing on failure

PBKDF2 - Derive Key from Password

WPA Key Calculation from PassPhrase to Hex

Duplicate .NET's Rfc2898DeriveBytes Functionality

Function Pkcs7ExtractDigest(ByVal signerIndex As Integer, ByVal pkcs7 As String) As String

Introduced in version 9.5.0.48

Extracts the signature digest contained within a PKCS7 signature. The PKCS7 is passed in the encoding determined by the EncodingMode property (such as base64, hex, etc.) an the signature digest is returned in the same encoding.

Returns Nothing on failure

Extract PKCS7 Signature Digest

Sub RandomizeIV()

Sets the initialization vector to a random value.

Sub RandomizeKey()

Sets the secret key to a random value.

Function ReadFile(ByVal filename As String) As Byte()

Convenience method to read an entire file and return as a byte array.

Returns an empty byte array on failure

Function ReEncode(ByVal encodedData As String, ByVal fromEncoding As String, ByVal toEncoding As String) As String

Provides a means for converting from one encoding to another (such as base64 to hex). This is helpful for programming environments where byte arrays are a real pain-in-the-***. The fromEncoding and toEncoding may be (case-insensitive) "Base64", "modBase64", "Base32", "Base58", "UU", "QP" (for quoted-printable), "URL" (for url-encoding), "Hex", "Q", "B", "url_oauth", "url_rfc1738", "url_rfc2396", and "url_rfc3986".

Returns Nothing on failure

Function SaveLastError(ByVal path As String) As Boolean

Saves the last-error information (the contents of LastErrorXml) to an XML formatted file.

Returns True for success, False for failure.

Function SetCSP(ByVal csp As Csp) As Boolean

(Only applies to the Microsoft Windows OS) Sets the Cryptographic Service Provider (CSP) to be used for PKI public-key encryption / signing, or public-key decryption / signature verification.

This is not commonly used becaues the default Microsoft CSP is typically appropriate. One instance where SetCSP is necessary is when using the Crypto-Pro CSP for the GOST R 34.10-2001 and GOST R 34.10-94 providers.

Returns True for success, False for failure.

Function SetDecryptCert(ByVal cert As Cert) As Boolean

Sets the digital certificate to be used for decryption when the CryptAlgorithm property is set to "PKI". A private key is required for decryption. Because this method only specifies the certificate, a prerequisite is that the certificate w/ private key must have been pre-installed on the computer. Private keys are stored in the Windows Protected Store (either a user account specific store, or the system-wide store). The Chilkat component will automatically locate and find the certificate's corresponding private key from the protected store when decrypting.

Returns True for success, False for failure.

Function SetDecryptCert2(ByVal cert As Cert, ByVal key As PrivateKey) As Boolean

Sets the digital certificate to be used for decryption when the CryptAlgorithm property is set to "PKI". The private key is supplied in the 2nd argument to this method, so there is no requirement that the certificate be pre-installed on a computer before decrypting (if this method is called).

Returns True for success, False for failure.

Function SetEncodedAad(ByVal aadStr As String, ByVal encoding As String) As Boolean

Introduced in version 9.5.0.55

Sets the authenticated additional data from an encoded string. The authenticated additional data (AAD), if any, is used in authenticated encryption modes such as GCM. The aadStr argument can be set to any of the following strings: "base64", "hex", "quoted-printable", "ascii", or "url".

The Aad is used when the CipherMode is "gcm" (Galois/Counter Mode), which is a mode valid for symmetric ciphers that have a block size of 16 bytes, such as AES or Twofish.

Returns True for success, False for failure.

AEAD AES 128-bit GCM

Function SetEncodedAuthTag(ByVal authTagStr As String, ByVal encoding As String) As Boolean

Introduced in version 9.5.0.55

Sets the expected authenticated tag from an encoded string. The authenticated tag is used in authenticated encryption modes such as GCM. An application would set the expected authenticated tag prior to decrypting. The authTagStr argument can be set to any of the following strings: "base64", "hex", "quoted-printable", "ascii", or "url".

The authenticated tag plays a role when the CipherMode is "gcm" (Galois/Counter Mode), which is a mode valid for symmetric block ciphers that have a block size of 16 bytes, such as AES or Twofish.

Returns True for success, False for failure.

AEAD AES 128-bit GCM

Sub SetEncodedIV(ByVal ivStr As String, ByVal encoding As String)

Sets the initialization vector from an encoded string. The encoding argument can be set to any of the following strings: "base64", "hex", "quoted-printable", "ascii", or "url".

Sub SetEncodedKey(ByVal keyStr As String, ByVal encoding As String)

Sets the secret key from an encoded string. The encoding argument can be set to any of the following strings: "base64", "hex", "quoted-printable", "ascii", or "url".

Generate Encryption Key

Sub SetEncodedSalt(ByVal saltStr As String, ByVal encoding As String)

Sets the password-based encryption (PBE) salt bytes from an encoded string. The encoding argument can be set to any of the following strings: "base64", "hex", "quoted-printable", "ascii", or "url".

Function SetEncryptCert(ByVal cert As Cert) As Boolean

Tells the encryption library to use a specific digital certificate for public-key encryption. To encrypt with multiple certificates, call AddEncryptCert once for each certificate. (Calling this method is the equivalent of calling ClearEncryptCerts followed by AddEncryptCert.)

Returns True for success, False for failure.

RSAES-OAEP Encrypt String with AES-128 Content Encryption and SHA256

Sub SetHmacKeyBytes(ByVal keyBytes As Byte())

This method is deprecated. It will be removed in a future version.

Sets the HMAC key to be used for one of the HMAC methods.

Note: If using Chilkat v9.5.0.55 or later, update your programs to use SetMacKeyBytes instead.

Sub SetHmacKeyEncoded(ByVal key As String, ByVal encoding As String)

This method is deprecated. It will be removed in a future version.

Sets the secret key to be used for one of the HMAC methods. The encoding can be set to any of the following strings: "base64", "hex", "quoted-printable", or "url".

Note: If using Chilkat v9.5.0.55 or later, update your programs to use SetMacKeyEncoded instead.

Sub SetHmacKeyString(ByVal key As String)

This method is deprecated. It will be removed in a future version.

Sets the MAC key to be used for one of the HMAC methods.

Note: If using Chilkat v9.5.0.55 or later, update your programs to use SetMacKeyString instead.

Demonstrates HMAC SHA256

Function SetMacKeyBytes(ByVal keyBytes As Byte()) As Boolean

Introduced in version 9.5.0.55

Sets the MAC key to be used for one of the Mac methods.

Returns True for success, False for failure.

Function SetMacKeyEncoded(ByVal key As String, ByVal encoding As String) As Boolean

Introduced in version 9.5.0.55

Sets the MAC key to be used for one of the Mac methods. The encoding can be set to any of the following strings: "base64", "hex", "quoted-printable", or "url".

Returns True for success, False for failure.

Poly1305 MAC

Function SetMacKeyString(ByVal key As String) As Boolean

Introduced in version 9.5.0.55

Sets the MAC key to be used for one of the Mac methods.

Returns True for success, False for failure.

Sub SetSecretKeyViaPassword(ByVal password As String)

Accepts a password string and (internally) generates a binary secret key of the appropriate bit length and sets the SecretKey property. This method should only be used if you are using Chilkat for both encryption and decryption because the password-to-secret-key algorithm would need to be identical for the decryption to match the encryption.

There is no minimum or maximum password length. The password string is transformed to a binary secret key by computing the MD5 digest (of the utf-8 password) to obtain 16 bytes. If the KeyLength is greater than 16 bytes, then the MD5 digest of the Base64 encoding of the utf-8 password is added. A max of 32 bytes of key material is generated, and this is truncated to the actual KeyLength required. The example below shows how to manually duplicate the computation.

Manually Duplicate SetSecretKeyViaPassword

openssl enc decrypt

Function SetSigningCert(ByVal cert As Cert) As Boolean

Specifies a certificate to be used when creating PKCS7 digital signatures. Signing requires both a certificate and private key. In this case, the private key is implicitly specified if the certificate originated from a PFX that contains the corresponding private key, or if on a Windows-based computer where the certificate and corresponding private key are pre-installed. (If a PFX file is used, it is provided via the AddPfxSourceFile or AddPfxSourceData methods.)

Returns True for success, False for failure.

Function SetSigningCert2(ByVal cert As Cert, ByVal privateKey As PrivateKey) As Boolean

Specifies a digital certificate and private key to be used for creating PKCS7 digital signatures.

Returns True for success, False for failure.

Create and Verify an Opaque PKCS7/CMS Signature

Function SetVerifyCert(ByVal cert As Cert) As Boolean

Sets the digital certificate to be used in verifying a signature.

Returns True for success, False for failure.

Create and Verify an Opaque PKCS7/CMS Signature

Function SignBdENC(ByVal dataToSign As BinData) As String

Introduced in version 9.5.0.67

Digitally signs the contents of dataToSign and returns the detached digital signature in an encoded string (according to the EncodingMode property setting).

Returns Nothing on failure

RSASSA-PSS Sign Binary Data

Function SignBytes(ByVal data As Byte()) As Byte()

Digitally signs a byte array and returns the detached digital signature. A certificate must be set by calling SetSigningCert prior to calling this method.

Returns an empty byte array on failure

Function SignBytesENC(ByVal data As Byte()) As String

Digitally signs a byte array and returns the detached digital signature encoded as a printable string. A certificate must be set by calling SetSigningCert prior to calling this method. The EncodingMode property controls the output encoding, which can be "Base64", "QP", or "Hex".

Returns Nothing on failure

Supported Binary Encodings

Function SignSbENC(ByVal sb As StringBuilder) As String

Introduced in version 9.5.0.67

Digitally signs a the contents of sb and returns the PKCS7 detached digital signature as an encoded string according to the EncodingMode property setting.

Returns Nothing on failure

RSASSA-PSS Sign Text

Function SignString(ByVal str As String) As Byte()

Digitally signs a string and returns the detached digital signature. A certificate must be set by calling SetSigningCert prior to calling this method. The Charset property controls the character encoding of the string that is signed. (Languages such as VB.NET, C#, and Visual Basic work with Unicode strings.) To sign Unicode data (2 bytes per char), set the Charset property to "Unicode". To implicitly convert the string to a mutlibyte charset such as "iso-8859-1", "Shift_JIS", "utf-8", or something else, then set the Charset property to the name of the charset before signing. The complete list of charsets is listed in the EncryptString method description.

Returns an empty byte array on failure

Function SignStringENC(ByVal str As String) As String

Digitally signs a string and returns the PKCS7 detached digital signature as an encoded string. A certificate must be set by calling SetSigningCert prior to calling this method. The Charset property controls the character encoding of the string that is signed. (Languages such as VB.NET, C#, and Visual Basic work with Unicode strings.) To sign Unicode data (2 bytes per char), set the Charset property to "Unicode". To implicitly convert the string to a mutlibyte charset such as "iso-8859-1", "Shift_JIS", "utf-8", or something else, then set the Charset property to the name of the charset before signing. The complete list of charsets is listed in the EncryptString method description.

The encoding of the output string is controlled by the EncodingMode property, which can be set to "Base64", "QP", or "Hex".

Returns Nothing on failure

Supported Binary Encodings

RSASSA-PSS Sign String to Create Base64 PCKS7 Signature

Function StringToBytes(ByVal inStr As String, ByVal charset As String) As Byte()

Convert a string to a byte array where the characters are encoded according to the charset specified.

Returns an empty byte array on failure

Function TrimEndingWith(ByVal inStr As String, ByVal ending As String) As String

Trim a string ending with a specific substring until the string no longer ends with that substring.

Returns Nothing on failure

Function UnlockComponent(ByVal unlockCode As String) As Boolean

Unlocks the component. This must be called once prior to calling any other method.

Returns True for success, False for failure.

Diagnosing UnlockComponent Problems

UnlockComponent LastErrorText shows exact string passed to it.

Verify UnlockComponent Success w/ Purchased Unlock Code

LastErrorText Standard Information

Function UseCertVault(ByVal vault As XmlCertVault) As Boolean

Introduced in version 9.5.0.40

Adds an XML certificate vault to the object's internal list of sources to be searched for certificates and private keys when encrypting/decrypting or signing/verifying. Unlike the AddPfxSourceData and AddPfxSourceFile methods, only a single XML certificate vault can be used. If UseCertVault is called multiple times, only the last certificate vault will be used, as each call to UseCertVault will replace the certificate vault provided in previous calls.

Returns True for success, False for failure.

Function VerifyBdENC(ByVal data As BinData, ByVal encodedSig As String) As Boolean

Introduced in version 9.5.0.67

Verifies a digital signature against the original data contained in data. Returns True if the signature is verified.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Returns True for success, False for failure.

RSASSA-PSS Sign Binary Data

Function VerifyBytes(ByVal data As Byte(), ByVal sig As Byte()) As Boolean

Verifies a byte array against a digital signature and returns true if the byte array is unaltered.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Function VerifyBytesENC(ByVal data As Byte(), ByVal encodedSig As String) As Boolean

Verifies a byte array against a string-encoded digital signature and returns true if the byte array is unaltered. This method can be used to verify a signature produced by SignBytesENC. The EncodingMode property must be set prior to calling to match the encoding of the digital signature string ("Base64", "QP", or "Hex").

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Supported Binary Encodings

Function VerifyDetachedSignature(ByVal inFilename As String, ByVal p7sFilename As String) As Boolean

Verifies a .p7s (PKCS #7 Signature) against the original file (or exact copy of it). If the inFilename has not been modified, the return value is True, otherwise it is False. This method is equivalent to VerifyP7S.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Function VerifyP7M(ByVal p7mPath As String, ByVal destPath As String) As Boolean

Verifies a .p7m file and extracts the original file from the .p7m. Returns True if the signature is valid and the contents are unchanged. Otherwise returns False.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Extract a File from a .p7m (PKCS7 Signed-Data)

CAdES BES Attached (Opaque) Signature

Create P7M Using Pre-Installed Windows Certificate

Function VerifyP7S(ByVal inFilename As String, ByVal p7sFilename As String) As Boolean

Verifies a .p7s (PKCS #7 Signature) against the original file (or exact copy of it). If the inFilename has not been modified, the return value is True, otherwise it is False.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

CAdES BES Detached Signature

Function VerifySbENC(ByVal sb As StringBuilder, ByVal encodedSig As String) As Boolean

Introduced in version 9.5.0.67

Verifies a digital signature against the original data contained in sb. Returns True if the signature is verified.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Returns True for success, False for failure.

RSASSA-PSS Sign Text

Function VerifyString(ByVal str As String, ByVal sig As Byte()) As Boolean

Verifies a string against a binary digital signature and returns true if the string is unaltered. This method can be used to verify a signature produced by SignString. The Charset property must be set to the charset that was used when creating the signature.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Function VerifyStringENC(ByVal str As String, ByVal encodedSig As String) As Boolean

Verifies a string against a string-encoded digital signature and returns true if the string is unaltered. This method can be used to verify a signature produced by SignStringENC. The Charset and EncodingMode properties must be set to the same values that were used when creating the signature.

Note: The signer certificates can be retrieved after any Verify* method call by using the NumSignerCerts property and the GetSignerCert method.

Supported Binary Encodings

RSASSA-PSS Sign String to Create Base64 PCKS7 Signature

Function WriteFile(ByVal filename As String, ByVal fileData As Byte()) As Boolean

Convenience method to write an entire byte array to a file.

Returns True for success, False for failure.

Events

Event OnAbortCheck

Provides the opportunity for a method call to be aborted. The AbortCheck event is fired periodically based on the value of the HeartbeatMs property. If HeartbeatMs is 0, then no AbortCheck events will fire. As an example, to fire 5 AbortCheck events per second, set the HeartbeatMs property equal to 200.

Args are passed using Chilkat.AbortCheckEventArgs

Event callback implementation:

Dim WithEvents crypt As Chilkat.Crypt2

Private Sub crypt_OnAbortCheck(sender As Object, args As Chilkat.AbortCheckEventArgs) Handles crypt.OnAbortCheck

    ...

End Sub

Event OnBinaryData

Binary data provided by certain methods.

Args are passed using Chilkat.BinaryDataEventArgs

Event callback implementation:

Dim WithEvents crypt As Chilkat.Crypt2

Private Sub crypt_OnBinaryData(sender As Object, args As Chilkat.BinaryDataEventArgs) Handles crypt.OnBinaryData

    ...

End Sub

Event OnPercentDone

Provides the percentage completed for any method that involves network communications or time-consuming processing (assuming it is a method where a percentage completion can be measured). This event is only fired when it is possible to know a percentage completion, and when it makes sense to express the operation as a percentage completed. The pctDone argument will have a value from 1 to 100. For operations (Chilkat method calls) that complete very quickly, the number of PercentDone callbacks will vary, but the final callback should have a value of 100. For long running operations, no more than one callback per percentage point will occur (for example: 1, 2, 3, ... 98, 99, 100).

The PercentDone callback counts as an AbortCheck event. For method calls that complete quickly such that PercentDone events fire, it may be that AbortCheck events don't fire because the opportunity to abort is already provided in the PercentDone callback. For time consuming operations, where the amount of time between PercentDone callbacks are long, AbortCheck callbacks may be used to allow for the operation to be aborted in a more responsive manner.

The abort output argument provides a means for aborting the operation. Setting it to True will cause the method to abort and return a failed status (or whatever return value indicates failure).

Args are passed using Chilkat.PercentDoneEventArgs

Event callback implementation:

Dim WithEvents crypt As Chilkat.Crypt2

Private Sub crypt_OnPercentDone(sender As Object, args As Chilkat.PercentDoneEventArgs) Handles crypt.OnPercentDone

    ...

End Sub

Event OnProgressInfo

A general name/value event that provides information about what is happening during a method call. To find out what information is available, write code to handle this event and log the name/value pairs. Most are self-explanatory.

Args are passed using Chilkat.ProgressInfoEventArgs

Event callback implementation:

Dim WithEvents crypt As Chilkat.Crypt2

Private Sub crypt_OnProgressInfo(sender As Object, args As Chilkat.ProgressInfoEventArgs) Handles crypt.OnProgressInfo

    ...

End Sub

Event OnTaskCompleted

Called in the background thread when an asynchronous task completes.

VB.NET TaskCompleted Event Callback Example

Args are passed using Chilkat.TaskCompletedEventArgs

Event callback implementation:

Dim WithEvents crypt As Chilkat.Crypt2

Private Sub crypt_OnTaskCompleted(sender As Object, args As Chilkat.TaskCompletedEventArgs) Handles crypt.OnTaskCompleted

    ...

End Sub

Event OnTextData

Text data provided by certain methods.

Args are passed using Chilkat.TextDataEventArgs

Event callback implementation:

Dim WithEvents crypt As Chilkat.Crypt2

Private Sub crypt_OnTextData(sender As Object, args As Chilkat.TextDataEventArgs) Handles crypt.OnTextData

    ...

End Sub