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| author | watcherhd <watcherhd@e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb> | 2011-11-26 14:19:43 +0000 |
|---|---|---|
| committer | watcherhd <watcherhd@e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb> | 2011-11-26 14:19:43 +0000 |
| commit | 7aff1e4cb053394db57c2814d5fe1e6493e0cc75 (patch) | |
| tree | c8585e44049b37e4da152495c954242204c2c38d /CryptoPP/crypto/emsa2.cpp | |
| parent | 6f3d69266933ef120d229e0daf2da164b77214d0 (diff) | |
Project folders rename part 2
git-svn-id: http://miranda-plugins.googlecode.com/svn/trunk@214 e753b5eb-9565-29b2-b5c5-2cc6f99dfbcb
Diffstat (limited to 'CryptoPP/crypto/emsa2.cpp')
| -rw-r--r-- | CryptoPP/crypto/emsa2.cpp | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/CryptoPP/crypto/emsa2.cpp b/CryptoPP/crypto/emsa2.cpp new file mode 100644 index 0000000..4397435 --- /dev/null +++ b/CryptoPP/crypto/emsa2.cpp @@ -0,0 +1,34 @@ +// emsa2.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+#include "emsa2.h"
+
+#ifndef CRYPTOPP_IMPORTS
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void EMSA2Pad::ComputeMessageRepresentative(RandomNumberGenerator &rng,
+ const byte *recoverableMessage, size_t recoverableMessageLength,
+ HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+ byte *representative, size_t representativeBitLength) const
+{
+ assert(representativeBitLength >= MinRepresentativeBitLength(hashIdentifier.second, hash.DigestSize()));
+
+ if (representativeBitLength % 8 != 7)
+ throw PK_SignatureScheme::InvalidKeyLength("EMSA2: EMSA2 requires a key length that is a multiple of 8");
+
+ size_t digestSize = hash.DigestSize();
+ size_t representativeByteLength = BitsToBytes(representativeBitLength);
+
+ representative[0] = messageEmpty ? 0x4b : 0x6b;
+ memset(representative+1, 0xbb, representativeByteLength-digestSize-4); // pad with 0xbb
+ byte *afterP2 = representative+representativeByteLength-digestSize-3;
+ afterP2[0] = 0xba;
+ hash.Final(afterP2+1);
+ representative[representativeByteLength-2] = *hashIdentifier.first;
+ representative[representativeByteLength-1] = 0xcc;
+}
+
+NAMESPACE_END
+
+#endif
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