diff options
Diffstat (limited to 'plugins/CryptoPP/crypto/shark.cpp')
| -rw-r--r-- | plugins/CryptoPP/crypto/shark.cpp | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/plugins/CryptoPP/crypto/shark.cpp b/plugins/CryptoPP/crypto/shark.cpp new file mode 100644 index 0000000000..1692a88005 --- /dev/null +++ b/plugins/CryptoPP/crypto/shark.cpp @@ -0,0 +1,141 @@ +// 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], GF256::Element(a>>(56-8*j)))) << (56-8*i);
+ return result;
+}
+
+void SHARK::Base::UncheckedSetKey(const byte *key, unsigned int keyLen, const NameValuePairs ¶ms)
+{
+ AssertValidKeyLength(keyLen);
+
+ m_rounds = GetRoundsAndThrowIfInvalid(params, this);
+ 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 (!IsForwardTransformation())
+ {
+ 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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