1 files changed, 124 insertions, 0 deletions

diff --git a/CryptoPP/pkcspad.cpp b/CryptoPP/pkcspad.cpp
new file mode 100644
index 000000000..e1f1d1e23
--- /dev/null
+++ b/CryptoPP/pkcspad.cpp
@@ -0,0 +1,124 @@
+// pkcspad.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+
+#ifndef CRYPTOPP_PKCSPAD_CPP	// SunCC workaround: compiler could cause this file to be included twice
+#define CRYPTOPP_PKCSPAD_CPP
+
+#include "pkcspad.h"
+#include <assert.h>
+
+NAMESPACE_BEGIN(CryptoPP)
+
+// more in dll.cpp
+template<> const byte PKCS_DigestDecoration<Weak1::MD2>::decoration[] = {0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x02,0x05,0x00,0x04,0x10};
+template<> const unsigned int PKCS_DigestDecoration<Weak1::MD2>::length = sizeof(PKCS_DigestDecoration<Weak1::MD2>::decoration);
+
+template<> const byte PKCS_DigestDecoration<Weak1::MD5>::decoration[] = {0x30,0x20,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0x04,0x10};
+template<> const unsigned int PKCS_DigestDecoration<Weak1::MD5>::length = sizeof(PKCS_DigestDecoration<Weak1::MD5>::decoration);
+
+template<> const byte PKCS_DigestDecoration<RIPEMD160>::decoration[] = {0x30,0x21,0x30,0x09,0x06,0x05,0x2b,0x24,0x03,0x02,0x01,0x05,0x00,0x04,0x14};
+template<> const unsigned int PKCS_DigestDecoration<RIPEMD160>::length = sizeof(PKCS_DigestDecoration<RIPEMD160>::decoration);
+
+template<> const byte PKCS_DigestDecoration<Tiger>::decoration[] = {0x30,0x29,0x30,0x0D,0x06,0x09,0x2B,0x06,0x01,0x04,0x01,0xDA,0x47,0x0C,0x02,0x05,0x00,0x04,0x18};
+template<> const unsigned int PKCS_DigestDecoration<Tiger>::length = sizeof(PKCS_DigestDecoration<Tiger>::decoration);
+
+size_t PKCS_EncryptionPaddingScheme::MaxUnpaddedLength(size_t paddedLength) const
+{
+	return SaturatingSubtract(paddedLength/8, 10U);
+}
+
+void PKCS_EncryptionPaddingScheme::Pad(RandomNumberGenerator &rng, const byte *input, size_t inputLen, byte *pkcsBlock, size_t pkcsBlockLen, const NameValuePairs &parameters) const
+{
+	assert (inputLen <= MaxUnpaddedLength(pkcsBlockLen));	// this should be checked by caller
+
+	// convert from bit length to byte length
+	if (pkcsBlockLen % 8 != 0)
+	{
+		pkcsBlock[0] = 0;
+		pkcsBlock++;
+	}
+	pkcsBlockLen /= 8;
+
+	pkcsBlock[0] = 2;  // block type 2
+
+	// pad with non-zero random bytes
+	for (unsigned i = 1; i < pkcsBlockLen-inputLen-1; i++)
+		pkcsBlock[i] = (byte)rng.GenerateWord32(1, 0xff);
+
+	pkcsBlock[pkcsBlockLen-inputLen-1] = 0;     // separator
+	memcpy(pkcsBlock+pkcsBlockLen-inputLen, input, inputLen);
+}
+
+DecodingResult PKCS_EncryptionPaddingScheme::Unpad(const byte *pkcsBlock, size_t pkcsBlockLen, byte *output, const NameValuePairs &parameters) const
+{
+	bool invalid = false;
+	size_t maxOutputLen = MaxUnpaddedLength(pkcsBlockLen);
+
+	// convert from bit length to byte length
+	if (pkcsBlockLen % 8 != 0)
+	{
+		invalid = (pkcsBlock[0] != 0) || invalid;
+		pkcsBlock++;
+	}
+	pkcsBlockLen /= 8;
+
+	// Require block type 2.
+	invalid = (pkcsBlock[0] != 2) || invalid;
+
+	// skip past the padding until we find the separator
+	size_t i=1;
+	while (i<pkcsBlockLen && pkcsBlock[i++]) { // null body
+		}
+	assert(i==pkcsBlockLen || pkcsBlock[i-1]==0);
+
+	size_t outputLen = pkcsBlockLen - i;
+	invalid = (outputLen > maxOutputLen) || invalid;
+
+	if (invalid)
+		return DecodingResult();
+
+	memcpy (output, pkcsBlock+i, outputLen);
+	return DecodingResult(outputLen);
+}
+
+// ********************************************************
+
+#ifndef CRYPTOPP_IMPORTS
+
+void PKCS1v15_SignatureMessageEncodingMethod::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()));
+
+	size_t pkcsBlockLen = representativeBitLength;
+	// convert from bit length to byte length
+	if (pkcsBlockLen % 8 != 0)
+	{
+		representative[0] = 0;
+		representative++;
+	}
+	pkcsBlockLen /= 8;
+
+	representative[0] = 1;   // block type 1
+
+	unsigned int digestSize = hash.DigestSize();
+	byte *pPadding = representative + 1;
+	byte *pDigest = representative + pkcsBlockLen - digestSize;
+	byte *pHashId = pDigest - hashIdentifier.second;
+	byte *pSeparator = pHashId - 1;
+
+	// pad with 0xff
+	memset(pPadding, 0xff, pSeparator-pPadding);
+	*pSeparator = 0;
+	memcpy(pHashId, hashIdentifier.first, hashIdentifier.second);
+	hash.Final(pDigest);
+}
+
+#endif
+
+NAMESPACE_END
+
+#endif