diff options
Diffstat (limited to 'plugins/CryptoPP/crypto/src/3way.cpp')
| -rw-r--r-- | plugins/CryptoPP/crypto/src/3way.cpp | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/plugins/CryptoPP/crypto/src/3way.cpp b/plugins/CryptoPP/crypto/src/3way.cpp new file mode 100644 index 0000000000..f1265ce8d0 --- /dev/null +++ b/plugins/CryptoPP/crypto/src/3way.cpp @@ -0,0 +1,139 @@ +// 3way.cpp - modifed by Wei Dai from Joan Daemen's 3way.c
+// The original code and all modifications are in the public domain.
+
+#include "pch.h"
+#include "3way.h"
+#include "misc.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+void ThreeWay_TestInstantiations()
+{
+ ThreeWay::Encryption x1;
+ ThreeWay::Decryption x2;
+}
+
+static const word32 START_E = 0x0b0b; // round constant of first encryption round
+static const word32 START_D = 0xb1b1; // round constant of first decryption round
+static const word32 RC_MODULUS = 0x11011;
+
+static inline word32 reverseBits(word32 a)
+{
+ a = ((a & 0xAAAAAAAA) >> 1) | ((a & 0x55555555) << 1);
+ a = ((a & 0xCCCCCCCC) >> 2) | ((a & 0x33333333) << 2);
+ return ((a & 0xF0F0F0F0) >> 4) | ((a & 0x0F0F0F0F) << 4);
+}
+
+#define mu(a0, a1, a2) \
+{ \
+ a1 = reverseBits(a1); \
+ word32 t = reverseBits(a0); \
+ a0 = reverseBits(a2); \
+ a2 = t; \
+}
+
+#define pi_gamma_pi(a0, a1, a2) \
+{ \
+ word32 b0, b2; \
+ b2 = rotlFixed(a2, 1U); \
+ b0 = rotlFixed(a0, 22U); \
+ a0 = rotlFixed(b0 ^ (a1|(~b2)), 1U); \
+ a2 = rotlFixed(b2 ^ (b0|(~a1)), 22U);\
+ a1 ^= (b2|(~b0)); \
+}
+
+// thanks to Paulo Barreto for this optimized theta()
+#define theta(a0, a1, a2) \
+{ \
+ word32 b0, b1, c; \
+ c = a0 ^ a1 ^ a2; \
+ c = rotlFixed(c, 16U) ^ rotlFixed(c, 8U); \
+ b0 = (a0 << 24) ^ (a2 >> 8) ^ (a1 << 8) ^ (a0 >> 24); \
+ b1 = (a1 << 24) ^ (a0 >> 8) ^ (a2 << 8) ^ (a1 >> 24); \
+ a0 ^= c ^ b0; \
+ a1 ^= c ^ b1; \
+ a2 ^= c ^ (b0 >> 16) ^ (b1 << 16); \
+}
+
+#define rho(a0, a1, a2) \
+{ \
+ theta(a0, a1, a2); \
+ pi_gamma_pi(a0, a1, a2); \
+}
+
+void ThreeWay::Base::UncheckedSetKey(const byte *uk, unsigned int length, const NameValuePairs ¶ms)
+{
+ AssertValidKeyLength(length);
+
+ m_rounds = GetRoundsAndThrowIfInvalid(params, this);
+
+ for (unsigned int i=0; i<3; i++)
+ m_k[i] = (word32)uk[4*i+3] | ((word32)uk[4*i+2]<<8) | ((word32)uk[4*i+1]<<16) | ((word32)uk[4*i]<<24);
+
+ if (!IsForwardTransformation())
+ {
+ theta(m_k[0], m_k[1], m_k[2]);
+ mu(m_k[0], m_k[1], m_k[2]);
+ m_k[0] = ByteReverse(m_k[0]);
+ m_k[1] = ByteReverse(m_k[1]);
+ m_k[2] = ByteReverse(m_k[2]);
+ }
+}
+
+void ThreeWay::Enc::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+ typedef BlockGetAndPut<word32, BigEndian> Block;
+
+ word32 a0, a1, a2;
+ Block::Get(inBlock)(a0)(a1)(a2);
+
+ word32 rc = START_E;
+
+ for(unsigned i=0; i<m_rounds; i++)
+ {
+ a0 ^= m_k[0] ^ (rc<<16);
+ a1 ^= m_k[1];
+ a2 ^= m_k[2] ^ rc;
+ rho(a0, a1, a2);
+
+ rc <<= 1;
+ if (rc&0x10000) rc ^= 0x11011;
+ }
+ a0 ^= m_k[0] ^ (rc<<16);
+ a1 ^= m_k[1];
+ a2 ^= m_k[2] ^ rc;
+ theta(a0, a1, a2);
+
+ Block::Put(xorBlock, outBlock)(a0)(a1)(a2);
+}
+
+void ThreeWay::Dec::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
+{
+ typedef BlockGetAndPut<word32, LittleEndian> Block;
+
+ word32 a0, a1, a2;
+ Block::Get(inBlock)(a0)(a1)(a2);
+
+ word32 rc = START_D;
+
+ mu(a0, a1, a2);
+ for(unsigned i=0; i<m_rounds; i++)
+ {
+ a0 ^= m_k[0] ^ (rc<<16);
+ a1 ^= m_k[1];
+ a2 ^= m_k[2] ^ rc;
+ rho(a0, a1, a2);
+
+ rc <<= 1;
+ if (rc&0x10000) rc ^= 0x11011;
+ }
+ a0 ^= m_k[0] ^ (rc<<16);
+ a1 ^= m_k[1];
+ a2 ^= m_k[2] ^ rc;
+ theta(a0, a1, a2);
+ mu(a0, a1, a2);
+
+ Block::Put(xorBlock, outBlock)(a0)(a1)(a2);
+}
+
+NAMESPACE_END
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