dsa.h File Reference

Classes for the DSA signature algorithm. More...

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Enumerations
enum	DSASignatureFormat { DSA_P1363 , DSA_DER , DSA_OPENPGP }
	DSA Signature Format. More...

Functions
size_t	DSAConvertSignatureFormat (byte *buffer, size_t bufferSize, DSASignatureFormat toFormat, const byte *signature, size_t signatureLen, DSASignatureFormat fromFormat)
	Converts between signature encoding formats. More...

Detailed Description

Classes for the DSA signature algorithm.

Definition in file dsa.h.

Enumeration Type Documentation

DSASignatureFormat

enum DSASignatureFormat

DSA Signature Format.

The DSA signature format used by Crypto++ is as defined by IEEE P1363. OpenSSL, Java and .Net use the DER format, and OpenPGP uses the OpenPGP format.

See also

DSAConvertSignatureFormat on the Crypto++ wiki.

Since

Crypto++ 1.0

Enumerator
DSA_P1363	Crypto++ native signature encoding format.
DSA_DER	signature encoding format used by OpenSSL, Java and .Net
DSA_OPENPGP	OpenPGP signature encoding format.

Definition at line 20 of file dsa.h.

Function Documentation

DSAConvertSignatureFormat()

size_t DSAConvertSignatureFormat	(	byte *	buffer,
		size_t	bufferSize,
		DSASignatureFormat	toFormat,
		const byte *	signature,
		size_t	signatureLen,
		DSASignatureFormat	fromFormat
	)

Converts between signature encoding formats.

Parameters

buffer	byte buffer for the converted signature encoding
bufferSize	the length of the converted signature encoding buffer
toFormat	the source signature format
signature	byte buffer for the existing signature encoding
signatureLen	the length of the existing signature encoding buffer
fromFormat	the source signature format

Returns

the number of bytes written during encoding

This function converts between these formats, and returns length of signature in the target format. If toFormat == DSA_P1363, then bufferSize must equal publicKey.SignatureLength() or verifier.SignatureLength().

If the destination buffer is too small then the output of the encoded r and s will be truncated. Be sure to provide an adequately sized buffer and check the return value for the number of bytes written.

See also

DSAConvertSignatureFormat on the Crypto++ wiki.

Since

Crypto++ 1.0