CkRsa C++ Reference Documentation

CkRsa

Current Version: 9.5.0.75

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

// Local variable on the stack
CkRsa obj;

// Dynamically allocate/delete
CkRsa *pObj = new CkRsa();
// ...
delete pObj;

Properties

Charset
void get_Charset(CkString &str);
const char *charset(void);
void put_Charset(const char *ansiOrUtf8Str);

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
void get_DebugLogFilePath(CkString &str);
const char *debugLogFilePath(void);
void put_DebugLogFilePath(const char *ansiOrUtf8Str);

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
void get_EncodingMode(CkString &str);
const char *encodingMode(void);
void put_EncodingMode(const char *ansiOrUtf8Str);

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.

More Information and Examples
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LastErrorHtml
void get_LastErrorHtml(CkString &str);
const char *lastErrorHtml(void);

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
void get_LastErrorText(CkString &str);
const char *lastErrorText(void);

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
void get_LastErrorXml(CkString &str);
const char *lastErrorXml(void);

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
bool get_LastMethodSuccess(void);
void put_LastMethodSuccess(bool newVal);
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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LittleEndian
bool get_LittleEndian(void);
void put_LittleEndian(bool newVal);

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
bool get_NoUnpad(void);
void put_NoUnpad(bool newVal);

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

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NumBits
int get_NumBits(void);

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
void get_OaepHash(CkString &str);
const char *oaepHash(void);
void put_OaepHash(const char *ansiOrUtf8Str);
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
void get_OaepMgfHash(CkString &str);
const char *oaepMgfHash(void);
void put_OaepMgfHash(const char *ansiOrUtf8Str);
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
bool get_OaepPadding(void);
void put_OaepPadding(bool newVal);

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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Utf8
bool get_Utf8(void);
void put_Utf8(bool newVal);

When set to true, all "const char *" arguments are interpreted as utf-8 strings. If set to false (the default), then "const char *" arguments are interpreted as ANSI strings. Also, when set to true, and Chilkat method returning a "const char *" is returning the utf-8 representation. If set to false, all "const char *" return values are ANSI strings.

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VerboseLogging
bool get_VerboseLogging(void);
void put_VerboseLogging(bool newVal);

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
void get_Version(CkString &str);
const char *version(void);

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

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Methods

DecryptBytes
bool DecryptBytes(CkByteData &inData, bool usePrivateKey, CkByteData &outData);

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 true for success, false for failure.

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DecryptBytesENC
bool DecryptBytesENC(const char *str, bool bUsePrivateKey, CkByteData &outData);

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 true for success, false for failure.

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DecryptString
bool DecryptString(CkByteData &binarySig, bool usePrivateKey, CkString &outStr);
const char *decryptString(CkByteData &binarySig, bool usePrivateKey);

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 true for success, false for failure.

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DecryptStringENC
bool DecryptStringENC(const char *encodedSig, bool usePrivateKey, CkString &outStr);
const char *decryptStringENC(const char *encodedSig, bool usePrivateKey);

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 true for success, false for failure.

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EncryptBytes
bool EncryptBytes(CkByteData &binaryData, bool usePrivateKey, CkByteData &outData);

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 true for success, false for failure.

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EncryptBytesENC
bool EncryptBytesENC(CkByteData &data, bool bUsePrivateKey, CkString &outStr);
const char *encryptBytesENC(CkByteData &data, bool bUsePrivateKey);

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 true for success, false for failure.

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EncryptString
bool EncryptString(const char *stringToEncrypt, bool usePrivateKey, CkByteData &outData);

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 true for success, false for failure.

More Information and Examples
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EncryptStringENC
bool EncryptStringENC(const char *str, bool bUsePrivateKey, CkString &outStr);
const char *encryptStringENC(const char *str, bool bUsePrivateKey);

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 true for success, false for failure.

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ExportPrivateKey
bool ExportPrivateKey(CkString &outStr);
const char *exportPrivateKey(void);

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 true for success, false for failure.

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ExportPrivateKeyObj
CkPrivateKey *ExportPrivateKeyObj(void);
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.

Note: The application is responsible for deleting (via the C++ delete operator) the object returned by this method.

Returns NULL on failure

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ExportPublicKey
bool ExportPublicKey(CkString &outStr);
const char *exportPublicKey(void);

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 true for success, false for failure.

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ExportPublicKeyObj
CkPublicKey *ExportPublicKeyObj(void);
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.

Note: The application is responsible for deleting (via the C++ delete operator) the object returned by this method.

Returns NULL on failure

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GenerateKey
bool GenerateKey(int numBits);

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
bool ImportPrivateKey(const char *xmlKey);

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
bool ImportPrivateKeyObj(CkPrivateKey &key);
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
bool ImportPublicKey(const char *xmlKey);

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
bool ImportPublicKeyObj(CkPublicKey &key);
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.

More Information and Examples
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OpenSslSignBytes
bool OpenSslSignBytes(CkByteData &data, CkByteData &outBytes);

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

Returns true for success, false for failure.

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OpenSslSignBytesENC
bool OpenSslSignBytesENC(CkByteData &data, CkString &outStr);
const char *openSslSignBytesENC(CkByteData &data);

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 true for success, false for failure.

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OpenSslSignString
bool OpenSslSignString(const char *str, CkByteData &outBytes);

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

Returns true for success, false for failure.

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OpenSslSignStringENC
bool OpenSslSignStringENC(const char *str, CkString &outStr);
const char *openSslSignStringENC(const char *str);

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 true for success, false for failure.

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OpenSslVerifyBytes
bool OpenSslVerifyBytes(CkByteData &signature, CkByteData &outBytes);

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 true for success, false for failure.

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OpenSslVerifyBytesENC
bool OpenSslVerifyBytesENC(const char *str, CkByteData &outBytes);

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 true for success, false for failure.

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OpenSslVerifyString
bool OpenSslVerifyString(CkByteData &data, CkString &outStr);
const char *openSslVerifyString(CkByteData &data);

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 true for success, false for failure.

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OpenSslVerifyStringENC
bool OpenSslVerifyStringENC(const char *str, CkString &outStr);
const char *openSslVerifyStringENC(const char *str);

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 true for success, false for failure.

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SaveLastError
bool SaveLastError(const char *path);

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

Returns true for success, false for failure.

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SetX509Cert
bool SetX509Cert(CkCert &cert, bool usePrivateKey);
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
bool SignBytes(CkByteData &binaryData, const char *hashAlgorithm, CkByteData &outData);

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 true for success, false for failure.

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SignBytesENC
bool SignBytesENC(CkByteData &binaryData, const char *hashAlgorithm, CkString &outStr);
const char *signBytesENC(CkByteData &binaryData, const char *hashAlgorithm);

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 true for success, false for failure.

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SignHash
bool SignHash(CkByteData &hashBytes, const char *hashAlg, CkByteData &outBytes);

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

Returns true for success, false for failure.

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SignHashENC
bool SignHashENC(const char *encodedHash, const char *hashAlg, CkString &outStr);
const char *signHashENC(const char *encodedHash, const char *hashAlg);

The same as SignBytesENC except the hash is passed directly.

Returns true for success, false for failure.

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SignString
bool SignString(const char *strToBeHashed, const char *hashAlgorithm, CkByteData &outData);

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 true for success, false for failure.

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SignStringENC
bool SignStringENC(const char *strToBeHashed, const char *hashAlgorithm, CkString &outStr);
const char *signStringENC(const char *strToBeHashed, const char *hashAlgorithm);

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 true for success, false for failure.

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SnkToXml
bool SnkToXml(const char *filename, CkString &outStr);
const char *snkToXml(const char *filename);

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

Returns true for success, false for failure.

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UnlockComponent
bool UnlockComponent(const char *unlockCode);

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
bool VerifyBytes(CkByteData &originalData, const char *hashAlgorithm, CkByteData &signatureBytes);

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
bool VerifyBytesENC(CkByteData &originalData, const char *hashAlgorithm, const char *encodedSig);

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
bool VerifyHash(CkByteData &hashBytes, const char *hashAlg, CkByteData &sigBytes);

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

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VerifyHashENC
bool VerifyHashENC(const char *encodedHash, const char *hashAlg, const char *encodedSig);

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

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VerifyPrivateKey
bool VerifyPrivateKey(const char *xml);

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
bool VerifyString(const char *originalString, const char *hashAlgorithm, CkByteData &binarySig);

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
bool VerifyStringENC(const char *originalString, const char *hashAlgorithm, const char *encodedSig);

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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