From d23a489940499bd6c634a1cb0a9875f094f8a850 Mon Sep 17 00:00:00 2001
From: weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0>
Date: Thu, 20 Mar 2003 01:24:12 +0000
Subject: various changes for 5.1

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@38 57ff6487-cd31-0410-9ec3-f628ee90f5f0
---
 pkcspad.cpp | 75 +++++++++++++++++++++----------------------------------------
 1 file changed, 25 insertions(+), 50 deletions(-)

(limited to 'pkcspad.cpp')

diff --git a/pkcspad.cpp b/pkcspad.cpp
index e94a1fd..e04ac9d 100644
--- a/pkcspad.cpp
+++ b/pkcspad.cpp
@@ -18,6 +18,9 @@ template<> const unsigned int PKCS_DigestDecoration<MD5>::length = sizeof(PKCS_D
 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);
+
 template<> const byte PKCS_DigestDecoration<SHA256>::decoration[] = {0x30,0x31,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x01,0x05,0x00,0x04,0x20};
 template<> const unsigned int PKCS_DigestDecoration<SHA256>::length = sizeof(PKCS_DigestDecoration<SHA256>::decoration);
 
@@ -27,11 +30,9 @@ template<> const unsigned int PKCS_DigestDecoration<SHA384>::length = sizeof(PKC
 template<> const byte PKCS_DigestDecoration<SHA512>::decoration[] = {0x30,0x51,0x30,0x0d,0x06,0x09,0x60,0x86,0x48,0x01,0x65,0x03,0x04,0x02,0x03,0x05,0x00,0x04,0x40};
 template<> const unsigned int PKCS_DigestDecoration<SHA512>::length = sizeof(PKCS_DigestDecoration<SHA512>::decoration);
 
-
-
 unsigned int PKCS_EncryptionPaddingScheme::MaxUnpaddedLength(unsigned int paddedLength) const
 {
-	return paddedLength/8 > 10 ? paddedLength/8-10 : 0;
+	return SaturatingSubtract(paddedLength/8, 10U);
 }
 
 void PKCS_EncryptionPaddingScheme::Pad(RandomNumberGenerator &rng, const byte *input, unsigned int inputLen, byte *pkcsBlock, unsigned int pkcsBlockLen) const
@@ -72,7 +73,7 @@ DecodingResult PKCS_EncryptionPaddingScheme::Unpad(const byte *pkcsBlock, unsign
 	// Require block type 2.
 	invalid = (pkcsBlock[0] != 2) || invalid;
 
-	// skip past the padding until we find the seperator
+	// skip past the padding until we find the separator
 	unsigned i=1;
 	while (i<pkcsBlockLen && pkcsBlock[i++]) { // null body
 		}
@@ -90,62 +91,36 @@ DecodingResult PKCS_EncryptionPaddingScheme::Unpad(const byte *pkcsBlock, unsign
 
 // ********************************************************
 
-unsigned int PKCS_SignaturePaddingScheme::MaxUnpaddedLength(unsigned int paddedLength) const
-{
-	return paddedLength/8 > 10 ? paddedLength/8-10 : 0;
-}
-
-void PKCS_SignaturePaddingScheme::Pad(RandomNumberGenerator &, const byte *input, unsigned int inputLen, byte *pkcsBlock, unsigned int pkcsBlockLen) 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] = 1;   // block type 1
-
-	// padd with 0xff
-	memset(pkcsBlock+1, 0xff, pkcsBlockLen-inputLen-2);
-
-	pkcsBlock[pkcsBlockLen-inputLen-1] = 0;               // separator
-	memcpy(pkcsBlock+pkcsBlockLen-inputLen, input, inputLen);
-}
-
-DecodingResult PKCS_SignaturePaddingScheme::Unpad(const byte *pkcsBlock, unsigned int pkcsBlockLen, byte *output) const
+void PKCS1v15_SignatureMessageEncodingMethod::ComputeMessageRepresentative(RandomNumberGenerator &rng, 
+	const byte *recoverableMessage, unsigned int recoverableMessageLength,
+	HashTransformation &hash, HashIdentifier hashIdentifier, bool messageEmpty,
+	byte *representative, unsigned int representativeBitLength) const
 {
-	unsigned int maxOutputLen = MaxUnpaddedLength(pkcsBlockLen);
+	unsigned int digestSize = hash.DigestSize();
+	if (digestSize + hashIdentifier.second + 10 > representativeBitLength/8)
+		throw PK_Signer::KeyTooShort();
 
+	unsigned int pkcsBlockLen = representativeBitLength;
 	// convert from bit length to byte length
 	if (pkcsBlockLen % 8 != 0)
 	{
-		if (pkcsBlock[0] != 0)
-			return DecodingResult();
-		pkcsBlock++;
+		representative[0] = 0;
+		representative++;
 	}
 	pkcsBlockLen /= 8;
 
-	// Require block type 1.
-	if (pkcsBlock[0] != 1)
-		return DecodingResult();
-
-	// skip past the padding until we find the seperator
-	unsigned i=1;
-	while (i<pkcsBlockLen && pkcsBlock[i++])
-		if (pkcsBlock[i-1] != 0xff)     // not valid padding
-			return DecodingResult();
-	assert(i==pkcsBlockLen || pkcsBlock[i-1]==0);
+	representative[0] = 1;   // block type 1
 
-	unsigned int outputLen = pkcsBlockLen - i;
-	if (outputLen > maxOutputLen)
-		return DecodingResult();
+	byte *pPadding = representative + 1;
+	byte *pDigest = representative + pkcsBlockLen - digestSize;
+	byte *pHashId = pDigest - hashIdentifier.second;
+	byte *pSeparator = pHashId - 1;
 
-	memcpy (output, pkcsBlock+i, outputLen);
-	return DecodingResult(outputLen);
+	// pad with 0xff
+	memset(pPadding, 0xff, pSeparator-pPadding);
+	*pSeparator = 0;
+	memcpy(pHashId, hashIdentifier.first, hashIdentifier.second);
+	hash.Final(pDigest);
 }
 
 NAMESPACE_END
-- 
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