From 490d36e65ac24e34e3021c2a0947384aee138c88 Mon Sep 17 00:00:00 2001 From: Malf Furious Date: Wed, 13 Apr 2016 21:05:14 -0400 Subject: Root commit for new Compass repository This is the Alpha version of ComPASS, originally developed sometime in 2014. --- cryptopp562/dsa.cpp | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 cryptopp562/dsa.cpp (limited to 'cryptopp562/dsa.cpp') diff --git a/cryptopp562/dsa.cpp b/cryptopp562/dsa.cpp new file mode 100644 index 0000000..5aace48 --- /dev/null +++ b/cryptopp562/dsa.cpp @@ -0,0 +1,63 @@ +// dsa.cpp - written and placed in the public domain by Wei Dai + +#include "pch.h" + +#ifndef CRYPTOPP_IMPORTS + +#include "dsa.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 -- cgit v1.2.3