CryptoPP:

changed folder structure

git-svn-id: http://svn.miranda-ng.org/main/trunk@1083 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 145 insertions, 0 deletions

diff --git a/plugins/CryptoPP/crypto/src/pssr.cpp b/plugins/CryptoPP/crypto/src/pssr.cpp
new file mode 100644
index 0000000000..34ce71aed6
--- /dev/null
+++ b/plugins/CryptoPP/crypto/src/pssr.cpp
@@ -0,0 +1,145 @@
+// pssr.cpp - written and placed in the public domain by Wei Dai

+

+#include "pch.h"

+#include "pssr.h"

+#include <functional>

+

+NAMESPACE_BEGIN(CryptoPP)

+

+// more in dll.cpp

+template<> const byte EMSA2HashId<RIPEMD160>::id = 0x31;

+template<> const byte EMSA2HashId<RIPEMD128>::id = 0x32;

+template<> const byte EMSA2HashId<Whirlpool>::id = 0x37;

+

+#ifndef CRYPTOPP_IMPORTS

+

+size_t PSSR_MEM_Base::MinRepresentativeBitLength(size_t hashIdentifierLength, size_t digestLength) const

+{

+	size_t saltLen = SaltLen(digestLength);

+	size_t minPadLen = MinPadLen(digestLength);

+	return 9 + 8*(minPadLen + saltLen + digestLength + hashIdentifierLength);

+}

+

+size_t PSSR_MEM_Base::MaxRecoverableLength(size_t representativeBitLength, size_t hashIdentifierLength, size_t digestLength) const

+{

+	if (AllowRecovery())

+		return SaturatingSubtract(representativeBitLength, MinRepresentativeBitLength(hashIdentifierLength, digestLength)) / 8;

+	return 0;

+}

+

+bool PSSR_MEM_Base::IsProbabilistic() const 

+{

+	return SaltLen(1) > 0;

+}

+

+bool PSSR_MEM_Base::AllowNonrecoverablePart() const

+{

+	return true;

+}

+

+bool PSSR_MEM_Base::RecoverablePartFirst() const

+{

+	return false;

+}

+

+void PSSR_MEM_Base::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()));

+

+	const size_t u = hashIdentifier.second + 1;

+	const size_t representativeByteLength = BitsToBytes(representativeBitLength);

+	const size_t digestSize = hash.DigestSize();

+	const size_t saltSize = SaltLen(digestSize);

+	byte *const h = representative + representativeByteLength - u - digestSize;

+

+	SecByteBlock digest(digestSize), salt(saltSize);

+	hash.Final(digest);

+	rng.GenerateBlock(salt, saltSize);

+

+	// compute H = hash of M'

+	byte c[8];

+	PutWord(false, BIG_ENDIAN_ORDER, c, (word32)SafeRightShift<29>(recoverableMessageLength));

+	PutWord(false, BIG_ENDIAN_ORDER, c+4, word32(recoverableMessageLength << 3));

+	hash.Update(c, 8);

+	hash.Update(recoverableMessage, recoverableMessageLength);

+	hash.Update(digest, digestSize);

+	hash.Update(salt, saltSize);

+	hash.Final(h);

+

+	// compute representative

+	GetMGF().GenerateAndMask(hash, representative, representativeByteLength - u - digestSize, h, digestSize, false);

+	byte *xorStart = representative + representativeByteLength - u - digestSize - salt.size() - recoverableMessageLength - 1;

+	xorStart[0] ^= 1;

+	xorbuf(xorStart + 1, recoverableMessage, recoverableMessageLength);

+	xorbuf(xorStart + 1 + recoverableMessageLength, salt, salt.size());

+	memcpy(representative + representativeByteLength - u, hashIdentifier.first, hashIdentifier.second);

+	representative[representativeByteLength - 1] = hashIdentifier.second ? 0xcc : 0xbc;

+	if (representativeBitLength % 8 != 0)

+		representative[0] = (byte)Crop(representative[0], representativeBitLength % 8);

+}

+

+DecodingResult PSSR_MEM_Base::RecoverMessageFromRepresentative(

+	HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,

+	byte *representative, size_t representativeBitLength,

+	byte *recoverableMessage) const

+{

+	assert(representativeBitLength >= MinRepresentativeBitLength(hashIdentifier.second, hash.DigestSize()));

+

+	const size_t u = hashIdentifier.second + 1;

+	const size_t representativeByteLength = BitsToBytes(representativeBitLength);

+	const size_t digestSize = hash.DigestSize();

+	const size_t saltSize = SaltLen(digestSize);

+	const byte *const h = representative + representativeByteLength - u - digestSize;

+

+	SecByteBlock digest(digestSize);

+	hash.Final(digest);

+

+	DecodingResult result(0);

+	bool &valid = result.isValidCoding;

+	size_t &recoverableMessageLength = result.messageLength;

+

+	valid = (representative[representativeByteLength - 1] == (hashIdentifier.second ? 0xcc : 0xbc)) && valid;

+	valid = (memcmp(representative + representativeByteLength - u, hashIdentifier.first, hashIdentifier.second) == 0) && valid;

+

+	GetMGF().GenerateAndMask(hash, representative, representativeByteLength - u - digestSize, h, digestSize);

+	if (representativeBitLength % 8 != 0)

+		representative[0] = (byte)Crop(representative[0], representativeBitLength % 8);

+

+	// extract salt and recoverableMessage from DB = 00 ... || 01 || M || salt

+	byte *salt = representative + representativeByteLength - u - digestSize - saltSize;

+	byte *M = std::find_if(representative, salt-1, std::bind2nd(std::not_equal_to<byte>(), 0));

+	recoverableMessageLength = salt-M-1;

+	if (*M == 0x01 

+		&& (size_t)(M - representative - (representativeBitLength % 8 != 0)) >= MinPadLen(digestSize)

+		&& recoverableMessageLength <= MaxRecoverableLength(representativeBitLength, hashIdentifier.second, digestSize))

+	{

+		memcpy(recoverableMessage, M+1, recoverableMessageLength);

+	}

+	else

+	{

+		recoverableMessageLength = 0;

+		valid = false;

+	}

+

+	// verify H = hash of M'

+	byte c[8];

+	PutWord(false, BIG_ENDIAN_ORDER, c, (word32)SafeRightShift<29>(recoverableMessageLength));

+	PutWord(false, BIG_ENDIAN_ORDER, c+4, word32(recoverableMessageLength << 3));

+	hash.Update(c, 8);

+	hash.Update(recoverableMessage, recoverableMessageLength);

+	hash.Update(digest, digestSize);

+	hash.Update(salt, saltSize);

+	valid = hash.Verify(h) && valid;

+

+	if (!AllowRecovery() && valid && recoverableMessageLength != 0)

+		{throw NotImplemented("PSSR_MEM: message recovery disabled");}

+	

+	return result;

+}

+

+#endif

+

+NAMESPACE_END