64 lines
1.1 KiB
C++
64 lines
1.1 KiB
C++
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// dsa.cpp - written and placed in the public domain by Wei Dai
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#include "pch.h"
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#ifndef CRYPTOPP_IMPORTS
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#include "dsa.h"
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#include "nbtheory.h"
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NAMESPACE_BEGIN(CryptoPP)
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size_t DSAConvertSignatureFormat(byte *buffer, size_t bufferSize, DSASignatureFormat toFormat, const byte *signature, size_t signatureLen, DSASignatureFormat fromFormat)
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{
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Integer r, s;
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StringStore store(signature, signatureLen);
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ArraySink sink(buffer, bufferSize);
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switch (fromFormat)
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{
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case DSA_P1363:
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r.Decode(store, signatureLen/2);
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s.Decode(store, signatureLen/2);
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break;
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case DSA_DER:
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{
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BERSequenceDecoder seq(store);
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r.BERDecode(seq);
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s.BERDecode(seq);
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seq.MessageEnd();
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break;
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}
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case DSA_OPENPGP:
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r.OpenPGPDecode(store);
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s.OpenPGPDecode(store);
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break;
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}
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switch (toFormat)
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{
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case DSA_P1363:
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r.Encode(sink, bufferSize/2);
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s.Encode(sink, bufferSize/2);
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break;
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case DSA_DER:
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{
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DERSequenceEncoder seq(sink);
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r.DEREncode(seq);
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s.DEREncode(seq);
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seq.MessageEnd();
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break;
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}
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case DSA_OPENPGP:
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r.OpenPGPEncode(sink);
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s.OpenPGPEncode(sink);
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break;
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}
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return (size_t)sink.TotalPutLength();
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}
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NAMESPACE_END
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#endif
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