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