From b21162cf8e06f40baa1f58be6a8c17435cebc34d Mon Sep 17 00:00:00 2001
From: weidai <weidai@57ff6487-cd31-0410-9ec3-f628ee90f5f0>
Date: Fri, 4 Oct 2002 17:31:41 +0000
Subject: Initial revision

git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@2 57ff6487-cd31-0410-9ec3-f628ee90f5f0
---
 shark.cpp | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 shark.cpp

(limited to 'shark.cpp')

diff --git a/shark.cpp b/shark.cpp
new file mode 100644
index 0000000..fff3bfd
--- /dev/null
+++ b/shark.cpp
@@ -0,0 +1,142 @@
+// shark.cpp - written and placed in the public domain by Wei Dai
+
+#include "pch.h"
+
+#ifdef WORD64_AVAILABLE
+
+#include "shark.h"
+#include "misc.h"
+#include "modes.h"
+#include "gf256.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+static word64 SHARKTransform(word64 a)
+{
+	static const byte iG[8][8] = {
+		0xe7, 0x30, 0x90, 0x85, 0xd0, 0x4b, 0x91, 0x41, 
+		0x53, 0x95, 0x9b, 0xa5, 0x96, 0xbc, 0xa1, 0x68, 
+		0x02, 0x45, 0xf7, 0x65, 0x5c, 0x1f, 0xb6, 0x52, 
+		0xa2, 0xca, 0x22, 0x94, 0x44, 0x63, 0x2a, 0xa2, 
+		0xfc, 0x67, 0x8e, 0x10, 0x29, 0x75, 0x85, 0x71, 
+		0x24, 0x45, 0xa2, 0xcf, 0x2f, 0x22, 0xc1, 0x0e, 
+		0xa1, 0xf1, 0x71, 0x40, 0x91, 0x27, 0x18, 0xa5, 
+		0x56, 0xf4, 0xaf, 0x32, 0xd2, 0xa4, 0xdc, 0x71, 
+	};
+
+	word64 result=0;
+	GF256 gf256(0xf5);
+	for (unsigned int i=0; i<8; i++)
+		for(unsigned int j=0; j<8; j++) 
+			result ^= word64(gf256.Multiply(iG[i][j], a>>(56-8*j))) << (56-8*i);
+	return result;
+}
+
+void SHARK::Base::UncheckedSetKey(CipherDir dir, const byte *key, unsigned int keyLen, unsigned int rounds)
+{
+	AssertValidKeyLength(keyLen);
+	AssertValidRounds(rounds);
+
+	m_rounds = rounds;
+	m_roundKeys.New(m_rounds+1);
+
+	// concatenate key enought times to fill a
+	for (unsigned int i=0; i<(m_rounds+1)*8; i++)
+		((byte *)m_roundKeys.begin())[i] = key[i%keyLen];
+
+	SHARK::Encryption e;
+	e.InitForKeySetup();
+	byte IV[8] = {0,0,0,0,0,0,0,0};
+	CFB_Mode_ExternalCipher::Encryption cfb(e, IV);
+
+	cfb.ProcessString((byte *)m_roundKeys.begin(), (m_rounds+1)*8);
+
+	ConditionalByteReverse(BIG_ENDIAN_ORDER, m_roundKeys.begin(), m_roundKeys.begin(), (m_rounds+1)*8);
+
+	m_roundKeys[m_rounds] = SHARKTransform(m_roundKeys[m_rounds]);
+
+	if (dir == DECRYPTION)
+	{
+		unsigned int i;
+
+		// transform encryption round keys into decryption round keys
+		for (i=0; i<m_rounds/2; i++)
+			std::swap(m_roundKeys[i], m_roundKeys[m_rounds-i]);
+
+		for (i=1; i<m_rounds; i++)
+			m_roundKeys[i] = SHARKTransform(m_roundKeys[i]);
+	}
+
+#ifdef IS_LITTLE_ENDIAN
+	m_roundKeys[0] = ByteReverse(m_roundKeys[0]);
+	m_roundKeys[m_rounds] = ByteReverse(m_roundKeys[m_rounds]);
+#endif
+}
+
+// construct an SHARK_Enc object with fixed round keys, to be used to initialize actual round keys
+void SHARK::Enc::InitForKeySetup()
+{
+	m_rounds = DEFAULT_ROUNDS;
+	m_roundKeys.New(DEFAULT_ROUNDS+1);
+
+	for (unsigned int i=0; i<DEFAULT_ROUNDS; i++)
+		m_roundKeys[i] = cbox[0][i];
+
+	m_roundKeys[DEFAULT_ROUNDS] = SHARKTransform(cbox[0][DEFAULT_ROUNDS]);
+
+#ifdef IS_LITTLE_ENDIAN
+	m_roundKeys[0] = ByteReverse(m_roundKeys[0]);
+	m_roundKeys[m_rounds] = ByteReverse(m_roundKeys[m_rounds]);
+#endif
+}
+
+typedef word64 ArrayOf256Word64s[256];
+
+template <const byte *sbox, const ArrayOf256Word64s *cbox>
+struct SharkProcessAndXorBlock{		// VC60 workaround: problem with template functions
+inline SharkProcessAndXorBlock(const word64 *roundKeys, unsigned int rounds, const byte *inBlock, const byte *xorBlock, byte *outBlock)
+{
+	word64 tmp = *(word64 *)inBlock ^ roundKeys[0];
+
+	ByteOrder order = GetNativeByteOrder();
+	tmp = cbox[0][GetByte(order, tmp, 0)] ^ cbox[1][GetByte(order, tmp, 1)] 
+		^ cbox[2][GetByte(order, tmp, 2)] ^ cbox[3][GetByte(order, tmp, 3)] 
+		^ cbox[4][GetByte(order, tmp, 4)] ^ cbox[5][GetByte(order, tmp, 5)] 
+		^ cbox[6][GetByte(order, tmp, 6)] ^ cbox[7][GetByte(order, tmp, 7)]
+		^ roundKeys[1];
+
+	for(unsigned int i=2; i<rounds; i++) 
+	{
+		tmp = cbox[0][GETBYTE(tmp, 7)] ^ cbox[1][GETBYTE(tmp, 6)] 
+			^ cbox[2][GETBYTE(tmp, 5)] ^ cbox[3][GETBYTE(tmp, 4)] 
+			^ cbox[4][GETBYTE(tmp, 3)] ^ cbox[5][GETBYTE(tmp, 2)] 
+			^ cbox[6][GETBYTE(tmp, 1)] ^ cbox[7][GETBYTE(tmp, 0)]
+			^ roundKeys[i];
+	}
+
+	PutBlock<byte, BigEndian>(xorBlock, outBlock)
+		(sbox[GETBYTE(tmp, 7)])
+		(sbox[GETBYTE(tmp, 6)])
+		(sbox[GETBYTE(tmp, 5)])
+		(sbox[GETBYTE(tmp, 4)])
+		(sbox[GETBYTE(tmp, 3)])
+		(sbox[GETBYTE(tmp, 2)])
+		(sbox[GETBYTE(tmp, 1)])
+		(sbox[GETBYTE(tmp, 0)]);
+
+	*(word64 *)outBlock ^= roundKeys[rounds];
+}};
+
+void SHARK::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	SharkProcessAndXorBlock<sbox, cbox>(m_roundKeys, m_rounds, inBlock, xorBlock, outBlock);
+}
+
+void SHARK::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+	SharkProcessAndXorBlock<sbox, cbox>(m_roundKeys, m_rounds, inBlock, xorBlock, outBlock);
+}
+
+NAMESPACE_END
+
+#endif // WORD64_AVAILABLE
-- 
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