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// dsa.h - written and placed in the public domain by Wei Dai
//! \file
//! \headerfile dsa.h
//! \brief Classes for the DSA signature algorithm
#ifndef CRYPTOPP_DSA_H
#define CRYPTOPP_DSA_H
#include "cryptlib.h"
#include "gfpcrypt.h"
NAMESPACE_BEGIN(CryptoPP)
//! \brief DSA Signature Format
//! \details The DSA signature format used by Crypto++ is as defined by IEEE P1363.
//! Java nad .Net use the DER format, and OpenPGP uses the OpenPGP format.
enum DSASignatureFormat {
//! \brief Crypto++ native signature encoding format
DSA_P1363,
//! \brief signature encoding format used by Java and .Net
DSA_DER,
//! \brief OpenPGP signature encoding format
DSA_OPENPGP
};
//! \brief Converts between signature encoding formats
//! \param buffer byte buffer for the converted signature encoding
//! \param bufferSize the length of the converted signature encoding buffer
//! \param toFormat the source signature format
//! \param signature byte buffer for the existing signature encoding
//! \param signatureLen the length of the existing signature encoding buffer
//! \param fromFormat the source signature format
//! \details This function converts between these formats, and returns length
//! of signature in the target format. If <tt>toFormat == DSA_P1363</tt>, then
//! <tt>bufferSize</tt> must equal <tt>publicKey.SignatureLength()</tt>
size_t DSAConvertSignatureFormat(byte *buffer, size_t bufferSize, DSASignatureFormat toFormat,
const byte *signature, size_t signatureLen, DSASignatureFormat fromFormat);
NAMESPACE_END
#endif
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