Rsa DataFlex Reference Documentation

Rsa

Current Version: 9.5.0.73

RSA encryption component / library. Encrypt and decrypt byte arrays and strings. Generate public/private key pairs from 384 to 4096 bits in length. Import and export RSA keys. Import keys from SNK files. Input/output in raw binary, base64, hex encoding, quoted-printable, URL-encoding, etc.

Object Creation

// (Dataflex programs use the 32-bit Chilkat ActiveX)
Handle hoRsa
Get Create(RefClass(cComChilkatRsa)) to hoRsa

Properties

Charset
Function ComCharset Returns String
Procedure Set ComCharset String value

This property only applies when encrypting, decrypting, signing, or verifying signatures for strings. When encrypting strings, the input string is first converted to this charset before encrypting.

When decrypting, the decrypted data is interpreted as a string with this charset encoding and converted to the appropriate return. For example, ActiveX's returning strings always return Unicode (2 bytes/char). Java strings are utf-8. Chilkat C++ strings are ANSI or utf-8. .NET strings are Unicode.

The default value of this property is the ANSI charset of the local computer.

When signing string data, the input string is first converted to this charset before being hashed and signed. When verifying the signature for string data, the input string is first converted to this charset before the verification process begins.

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DebugLogFilePath
Function ComDebugLogFilePath Returns String
Procedure Set ComDebugLogFilePath String value

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.

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EncodingMode
Function ComEncodingMode Returns String
Procedure Set ComEncodingMode String value

Encoding mode to be used in methods ending in "ENC", such as EncryptStringENC. Valid EncodingModes are "base64", "hex", "url", or "quoted-printable" (or "qp"). Encryption methods ending in "ENC" will return encrypted data as a string encoded according to this property's value. Decryption methods ending in "ENC" accept an encoded string as specified by this property. The string is first decoded and then decrypted. The default value is "base64".

This property also applies to the "ENC" methods for creating and verifying digital signatures.

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LastBinaryResult
Function ComLastBinaryResult Returns Variant
Introduced in version 9.5.0.52

The binary data returned by the last (binary data returning) method called. Only available if Chilkat.Global.KeepBinaryResult is set to True. This provides a means for obtaining large varbinary results in the SQL Server environment (where limitations exist in getting large amounts of data returned by method calls, but where temp tables can be used for binary properties).

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LastErrorHtml
Function ComLastErrorHtml Returns String

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.

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LastErrorText
Function ComLastErrorText Returns String

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.

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LastErrorXml
Function ComLastErrorXml Returns String

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.

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LastMethodSuccess
Function ComLastMethodSuccess Returns Boolean
Procedure Set ComLastMethodSuccess Boolean value
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.

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LastStringResult
Function ComLastStringResult Returns String
Introduced in version 9.5.0.52

The string return value of the last (string returning) method called. Only available if Chilkat.Global.KeepStringResult is set to True. This provides a means for obtaining large string results in the SQL Server environment (where limitations exist in getting long strings returned by method calls, but where temp tables can be used for string properties).

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LastStringResultLen
Function ComLastStringResultLen Returns Integer
Introduced in version 9.5.0.53

The length, in characters, of the string contained in the LastStringResult property.

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LittleEndian
Function ComLittleEndian Returns Boolean
Procedure Set ComLittleEndian Boolean value

The default value is False, which means that signatures and encrypted output will be created using the big endian byte ordering. A value of True will produce little-endian output, which is what Microsoft's Crypto API produces.

Important: Prior to v9.5.0.49, this property behaved the opposite as it should for encryption. When updating from an older version of Chilkat to v9.5.0.49 or greater, the following change is required:

  • If the application did NOT explicity set the LittleEndian property, then no change is required for encryption/decryption. If signatures were being created or verified, then explicitly set this property to True.
  • If the application explicitly set this property, then reverse the setting ONLY if doing encryption/decryption. No changes are required if doing signature creation/verification.

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NoUnpad
Function ComNoUnpad Returns Boolean
Procedure Set ComNoUnpad Boolean value

If True, skips unpadding when decrypting. The default is False. This property value is typically left unchanged.

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NumBits
Function ComNumBits Returns Integer

The number of bits of the key generated or imported into this RSA encryption object. Keys ranging in size from 384 bits to 4096 bits can be generated by calling GenerateKey. A public or private key may be imported by calling ImportPublicKey or ImportPrivateKey. A key must be available either via GenerateKey or import before any of the encrypt/decrypt methods may be called.

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OaepHash
Function ComOaepHash Returns String
Procedure Set ComOaepHash String value
Introduced in version 9.5.0.48

Selects the hash algorithm for use within OAEP padding. The valid choices are "sha1", "sha256", "sha384", "sha512", "md2", "md5", "haval", "ripemd128", "ripemd160","ripemd256", or "ripemd320". The default is "sha1".

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OaepMgfHash
Function ComOaepMgfHash Returns String
Procedure Set ComOaepMgfHash String value
Introduced in version 9.5.0.71

Selects the MGF (mask generation) hash algorithm for use within OAEP padding. The valid choices are "sha1", "sha256", "sha384", "sha512", "md2", "md5", "haval", "ripemd128", "ripemd160","ripemd256", or "ripemd320". The default is "sha1".

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OaepPadding
Function ComOaepPadding Returns Boolean
Procedure Set ComOaepPadding Boolean value

Controls whether Optimal Asymmetric Encryption Padding (OAEP) is used for the padding scheme (for encrypting/decrypting). If set to False, PKCS1 v1.5 padding is used. If set to True, PKCS1 v2.0 (OAEP) padding is used.

Important: The OAEP padding algorithm uses randomly generated bytes. Therefore, the RSA result will be different each time, even if all of the other inputs are identical. For example, if you RSA encrypt or sign the same data using the same key 100 times, the output will appear different each time, but they are all valid.

When creating digital signatures, this property controls whether RSA-PSS or PKCS1 v1.5 is used. If True, then the RSA-PSS signature scheme is used. The default value of this property is False.

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VerboseLogging
Function ComVerboseLogging Returns Boolean
Procedure Set ComVerboseLogging Boolean value

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.

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Version
Function ComVersion Returns String

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

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Methods

DecryptBytes
Function ComDecryptBytes Variant inData Boolean usePrivateKey Returns Variant

Decrypts byte data using the RSA encryption algorithm. usePrivateKey should be set to True if the private key is to be used for decrypting. Otherwise it should be set to False if the public key is to be used for decrypting.

Important: If trying to match OpenSSL results, set the LittleEndian property = False.

Returns null on failure

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DecryptBytesENC
Function ComDecryptBytesENC String str Boolean bUsePrivateKey Returns Variant

Same as DecryptBytes, except the input is an encoded string. The encoding is specified by the EncodingMode property, which can have values such as "base64", "hex", "quoted-printable", "url", etc.

Important: If trying to match OpenSSL results, set the LittleEndian property = False.

Returns null on failure

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DecryptString
Function ComDecryptString Variant binarySig Boolean usePrivateKey Returns String

Decrypts encrypted string data and returns an unencrypted string. usePrivateKey should be set to True if the private key is to be used for decrypting. Otherwise it should be set to False if the public key is to be used. The Charset property controls how the component interprets the decrypted string. Depending on the programming language, strings are returned to the application as Unicode, utf-8, or ANSI. Internal to DecryptString, the decrypted string is automatically converted from the charset specified by the Charset property to the encoding required by the calling programming language.

Important: If trying to match OpenSSL results, set the LittleEndian property = False.

Returns null on failure

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DecryptStringENC
Function ComDecryptStringENC String encodedSig Boolean usePrivateKey Returns String

Same as DecryptString, except the input is an encoded string. The encoding is specified by the EncodingMode property, which can have values such as "base64", "hex", "quoted-printable", "url", etc.

Important: If trying to match OpenSSL results, set the LittleEndian property = False.

Returns null on failure

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EncryptBytes
Function ComEncryptBytes Variant binaryData Boolean usePrivateKey Returns Variant

Encrypts byte data using the RSA encryption algorithm. usePrivateKey should be set to True if the private key is to be used for encrypting. Otherwise it should be set to False if the public key is to be used for encrypting.

Important: If trying to match OpenSSL results, set the LittleEndian property = False.

Returns null on failure

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EncryptBytesENC
Function ComEncryptBytesENC Variant data Boolean bUsePrivateKey Returns String

Same as EncryptBytes, except the output is an encoded string. The encoding is specified by the EncodingMode property, which can have values such as "base64", "hex", "quoted-printable", "url", etc.

Important: If trying to match OpenSSL results, set the LittleEndian property = False.

Returns null on failure

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EncryptString
Function ComEncryptString String stringToEncrypt Boolean usePrivateKey Returns Variant

Encrypts a string using the RSA encryption algorithm. usePrivateKey should be set to True if the private key is to be used for encrypting. Otherwise it should be set to False if the public key is to be used for encrypting. The string is first converted (if necessary) to the character encoding specified by the Charset property before encrypting. The encrypted bytes are returned.

Important: If trying to match OpenSSL results, set the LittleEndian property = False.

Returns null on failure

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EncryptStringENC
Function ComEncryptStringENC String str Boolean bUsePrivateKey Returns String

Same as EncryptString, except the output is an encoded string. The encoding is specified by the EncodingMode property, which can have values such as "base64", "hex", "quoted-printable", "url", etc.

Important: If trying to match OpenSSL results, set the LittleEndian property = False.

Returns null on failure

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ExportPrivateKey
Function ComExportPrivateKey Returns String

Exports the private-key of an RSA key pair to XML format. This is typically called after generating a new RSA key via the GenerateKey method.

Returns null on failure

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ExportPrivateKeyObj
Function ComExportPrivateKeyObj Returns cComPrivateKey
Introduced in version 9.5.0.40

Exports the private-key to a private key object. This is typically called after generating a new RSA key via the GenerateKey method. Once the private key object is obtained, it may be saved in a variety of different formats.

Returns null on failure

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ExportPublicKey
Function ComExportPublicKey Returns String

Exports the public-key of an RSA key pair to XML format. This is typically called after generating a new RSA key via the GenerateKey method.

Returns null on failure

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ExportPublicKeyObj
Function ComExportPublicKeyObj Returns cComPublicKey
Introduced in version 9.5.0.40

Exports the public key to a public key object. Once the public key object is obtained, it may be saved in a variety of different formats.

Returns null on failure

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GenerateKey
Function ComGenerateKey Integer numBits Returns Boolean

Generates a new RSA public/private key pair. The number of bits can range from 512 to 8192. Typical key lengths are 1024, 2048, or 4096 bits. After successful generation, the public/private parts of the key can be exported to XML via the ExportPrivateKey and ExportPublicKey methods.

Note: Prior to version 9.5.0.49, the max key size was 4096 bits. Generating an 8192-bit RSA key takes a considerable amount of time and CPU processing power. There are no event callbacks or progress monitoring for RSA key generation. Calling this will block the thread until it returns.

Returns True for success, False for failure.

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ImportPrivateKey
Function ComImportPrivateKey String xmlKey Returns Boolean

Imports a private key from XML format. After successful import, the private key can be used to encrypt or decrypt. A private key (by definition) contains both private and public parts. This is because the public key consist of modulus and exponent. The private key consists of modulus, exponent, P, Q, DP, DQ, InverseQ, and D using base64 representation:

<RSAKeyValue>
  <Modulus>...</Modulus>
  <Exponent>...</Exponent>
  <P>...</P>
  <Q>...</Q>
  <DP>...</DP>
  <DQ>...</DQ>
  <InverseQ>...</InverseQ>
  <D>...</D>
</RSAKeyValue>

Important: The Rsa object can contain either a private key or a public key, but not both. Importing a private key overwrites the existing key regardless of whether the type of key is public or private.

Returns True for success, False for failure.

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ImportPrivateKeyObj
Function ComImportPrivateKeyObj cComPrivateKey key Returns Boolean
Introduced in version 9.5.0.40

Imports a private key from a private key object. The imported private key is used in methods that sign or decrypt.

Returns True for success, False for failure.

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ImportPublicKey
Function ComImportPublicKey String xmlKey Returns Boolean

Imports a public key from XML format. After successful import, the public key can be used to encrypt or decrypt.

Note: Importing a public key overwrites the key that is currently contained in this object - even if it's a private key.

A public key consists of modulus and exponent using base64 representation:

<RSAKeyValue>
  <Modulus>...</Modulus>
  <Exponent>...</Exponent>
</RSAKeyValue>

Important: The Rsa object can contain either a private key or a public key, but not both. Importing a private key overwrites the existing key regardless of whether the type of key is public or private.

Returns True for success, False for failure.

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ImportPublicKeyObj
Function ComImportPublicKeyObj cComPublicKey key Returns Boolean
Introduced in version 9.5.0.40

Imports a public key from a public key object. The imported public key is used in methods that encrypt data or verify signatures.

Returns True for success, False for failure.

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OpenSslSignBytes
Function ComOpenSslSignBytes Variant data Returns Variant

Duplicates OpenSSL's rsautl utility for creating RSA signatures. Input data consists of binary bytes, and returns the signature bytes.

Returns null on failure

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OpenSslSignBytesENC
Function ComOpenSslSignBytesENC Variant data Returns String

Duplicates OpenSSL's rsautl utility for creating RSA signatures. Input data consists of binary bytes, and returns the signature as a string encoded according to the EncodingMode property (base64, hex, etc.).

Returns null on failure

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OpenSslSignString
Function ComOpenSslSignString String str Returns Variant

Duplicates OpenSSL's rsautl utility for creating RSA signatures. Input data is a string, and returns the signature bytes.

Returns null on failure

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OpenSslSignStringENC
Function ComOpenSslSignStringENC String str Returns String

Duplicates OpenSSL's rsautl utility for creating RSA signatures. Input data is a string, and returns the signature as a string encoded according to the EncodingMode property (base64, hex, etc.).

Returns null on failure

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OpenSslVerifyBytes
Function ComOpenSslVerifyBytes Variant signature Returns Variant

Duplicates OpenSSL's rsautl utility for verifying RSA signatures and recovering the original data. Input data consists of the raw signature bytes and returns the original bytes.

Returns null on failure

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OpenSslVerifyBytesENC
Function ComOpenSslVerifyBytesENC String str Returns Variant

Duplicates OpenSSL's rsautl utility for verifying RSA signatures and recovering the original data. Input data is a signature string encoded according to the EncodingMode property (base64, hex, etc.). Returns the original bytes.

Returns null on failure

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OpenSslVerifyString
Function ComOpenSslVerifyString Variant data Returns String

Duplicates OpenSSL's rsautl utility for verifying RSA signatures and recovering the original data. Input data consists of the raw signature bytes and returns the original string.

Returns null on failure

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OpenSslVerifyStringENC
Function ComOpenSslVerifyStringENC String str Returns String

Duplicates OpenSSL's rsautl utility for verifying RSA signatures and recovering the original data. Input data is a signature string encoded according to the EncodingMode property (base64, hex, etc.). Returns the original string.

Returns null on failure

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SetX509Cert
Function ComSetX509Cert cComChilkatCert cert Boolean usePrivateKey Returns Boolean
Introduced in version 9.5.0.73

Provides the private or public key indirectly through a certificate. This method is especially useful on Windows computers where the private key is installed as non-exportable (such as on a hardware token).

Returns True for success, False for failure.

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SignBytes
Function ComSignBytes Variant binaryData String hashAlgorithm Returns Variant

Creates an RSA digital signature by hashing binaryData and then signing the hash. The hash algorithm is specified by hashAlgorithm, which may be "SHA-1", "MD5", "MD2", "SHA-256", "SHA-384", or "SHA-512". The recommended hash algorithm is "SHA-1".

Important: If trying to match OpenSSL results, set the LittleEndian property = False. (The LittleEndian property should also be set to False to match Amazon web services, such as CloudFront.)

A private key is required to create a digital signature.

An error is indicated when a byte array of 0 length is returned.

Returns null on failure

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SignBytesENC
Function ComSignBytesENC Variant binaryData String hashAlgorithm Returns String

Creates an RSA digital signature by hashing binaryData and then signing the hash. The hash algorithm is specified by hashAlgorithm, which may be "SHA-1", "MD5", "MD2", "SHA-256", "SHA-384", or "SHA-512". The recommended hash algorithm is "SHA-1". The digital signature is returned as an encoded string, where the encoding is specified by the EncodingMode property.

Important: If trying to match OpenSSL results, set the LittleEndian property = False. (The LittleEndian property should also be set to False to match Amazon web services, such as CloudFront.)

A private key is required to create a digital signature.

An error is indicated when null reference is returned.

Returns null on failure

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SignHash
Function ComSignHash Variant hashBytes String hashAlg Returns Variant

The same as the SignBytes method, except the hash to be signed is passed directly.

Returns null on failure

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SignHashENC
Function ComSignHashENC String encodedHash String hashAlg Returns String

The same as SignBytesENC except the hash is passed directly.

Returns null on failure

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SignString
Function ComSignString String strToBeHashed String hashAlgorithm Returns Variant

Creates an RSA digital signature by hashing strToBeHashed and then signing the hash. The hash algorithm is specified by hashAlgorithm, which may be "SHA-1", "MD5", "MD2", "SHA-256", "SHA-384", or "SHA-512". The recommended hash algorithm is "SHA-1".

Important: If trying to match OpenSSL results, set the LittleEndian property = False. (The LittleEndian property should also be set to False to match Amazon web services, such as CloudFront.)

A private key is required to create a digital signature.

An error is indicated when a byte array of 0 length is returned.

Returns null on failure

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SignStringENC
Function ComSignStringENC String strToBeHashed String hashAlgorithm Returns String

Creates an RSA digital signature by hashing strToBeHashed and then signing the hash. The hash algorithm is specified by hashAlgorithm, which may be "SHA-1", "MD5", "MD2", "SHA-256", "SHA-384", or "SHA-512". The recommended hash algorithm is "SHA-1". The digital signature is returned as an encoded string, where the encoding is specified by the EncodingMode property.

Important: If trying to match OpenSSL results, set the LittleEndian property = False. (The LittleEndian property should also be set to False to match Amazon web services, such as CloudFront.)

A private key is required to create a digital signature.

An error is indicated when null reference is returned.

Returns null on failure

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SnkToXml
Function ComSnkToXml String filename Returns String

Imports a .snk file to an XML document that can be imported via the ImportPrivateKey method.

Returns null on failure

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UnlockComponent
Function ComUnlockComponent String unlockCode Returns Boolean

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

Returns True for success, False for failure.

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VerifyBytes
Function ComVerifyBytes Variant originalData String hashAlgorithm Variant signatureBytes Returns Boolean

Verifies an RSA digital signature. Returns True if the signature is valid for the originalData. The hashAlgorithm may be "SHA-1", "MD5", "MD2", "SHA-256", "SHA-384", or "SHA-512". The recommended hash algorithm is "SHA-1".

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VerifyBytesENC
Function ComVerifyBytesENC Variant originalData String hashAlgorithm String encodedSig Returns Boolean

Verifies an RSA digital signature. Returns True if the signature is valid for the originalData. The hashAlgorithm may be "SHA-1", "MD5", "MD2", "SHA-256", "SHA-384", or "SHA-512". The recommended hash algorithm is "SHA-1".

The encodedSig is a digital signature encoded according to the EncodingMode property (i.e. base64, hex, etc.).

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VerifyHash
Function ComVerifyHash Variant hashBytes String hashAlg Variant sigBytes Returns Boolean

The same as VerifyBytes except the hash of the original data is passed directly.

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VerifyHashENC
Function ComVerifyHashENC String encodedHash String hashAlg String encodedSig Returns Boolean

The same as VerifyBytesENC except the hash of the original data is passed directly.

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VerifyPrivateKey
Function ComVerifyPrivateKey String xml Returns Boolean

Returns True if the XML contains a valid RSA private key. Otherwise returns False.

Returns True for success, False for failure.

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VerifyString
Function ComVerifyString String originalString String hashAlgorithm Variant binarySig Returns Boolean

Verifies an RSA digital signature. Returns True if the signature is valid for the originalString. The hashAlgorithm may be "SHA-1", "MD5", "MD2", "SHA-256", "SHA-384", or "SHA-512". The recommended hash algorithm is "SHA-1".

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VerifyStringENC
Function ComVerifyStringENC String originalString String hashAlgorithm String encodedSig Returns Boolean

Verifies an RSA digital signature. Returns True if the signature is valid for the originalString. The hashAlgorithm may be "SHA-1", "MD5", "MD2", "SHA-256", "SHA-384", or "SHA-512". The recommended hash algorithm is "SHA-1".

The encodedSig is a digital signature encoded according to the EncodingMode property (i.e. base64, hex, etc.).

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