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/*
* Threefish-512
* (C) 2013,2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/internal/block_utils.h>
#include <botan/threefish.h>
namespace Botan {
BOTAN_REGISTER_BLOCK_CIPHER_NAMED_NOARGS(Threefish_512, "Threefish-512");
#define THREEFISH_ROUND(X0,X1,X2,X3,X4,X5,X6,X7,ROT1,ROT2,ROT3,ROT4) \
do { \
X0 += X4; \
X1 += X5; \
X2 += X6; \
X3 += X7; \
X4 = rotate_left(X4, ROT1); \
X5 = rotate_left(X5, ROT2); \
X6 = rotate_left(X6, ROT3); \
X7 = rotate_left(X7, ROT4); \
X4 ^= X0; \
X5 ^= X1; \
X6 ^= X2; \
X7 ^= X3; \
} while(0)
#define THREEFISH_INJECT_KEY(r) \
do { \
X0 += m_K[(r ) % 9]; \
X1 += m_K[(r+1) % 9]; \
X2 += m_K[(r+2) % 9]; \
X3 += m_K[(r+3) % 9]; \
X4 += m_K[(r+4) % 9]; \
X5 += m_K[(r+5) % 9] + m_T[(r ) % 3]; \
X6 += m_K[(r+6) % 9] + m_T[(r+1) % 3]; \
X7 += m_K[(r+7) % 9] + (r); \
} while(0)
#define THREEFISH_ENC_8_ROUNDS(R1,R2) \
do { \
THREEFISH_ROUND(X0,X2,X4,X6, X1,X3,X5,X7, 46,36,19,37); \
THREEFISH_ROUND(X2,X4,X6,X0, X1,X7,X5,X3, 33,27,14,42); \
THREEFISH_ROUND(X4,X6,X0,X2, X1,X3,X5,X7, 17,49,36,39); \
THREEFISH_ROUND(X6,X0,X2,X4, X1,X7,X5,X3, 44, 9,54,56); \
THREEFISH_INJECT_KEY(R1); \
\
THREEFISH_ROUND(X0,X2,X4,X6, X1,X3,X5,X7, 39,30,34,24); \
THREEFISH_ROUND(X2,X4,X6,X0, X1,X7,X5,X3, 13,50,10,17); \
THREEFISH_ROUND(X4,X6,X0,X2, X1,X3,X5,X7, 25,29,39,43); \
THREEFISH_ROUND(X6,X0,X2,X4, X1,X7,X5,X3, 8,35,56,22); \
THREEFISH_INJECT_KEY(R2); \
} while(0)
void Threefish_512::skein_feedfwd(const secure_vector<u64bit>& M,
const secure_vector<u64bit>& T)
{
BOTAN_ASSERT(m_K.size() == 9, "Key was set");
BOTAN_ASSERT(M.size() == 8, "Single block");
m_T[0] = T[0];
m_T[1] = T[1];
m_T[2] = T[0] ^ T[1];
u64bit X0 = M[0];
u64bit X1 = M[1];
u64bit X2 = M[2];
u64bit X3 = M[3];
u64bit X4 = M[4];
u64bit X5 = M[5];
u64bit X6 = M[6];
u64bit X7 = M[7];
THREEFISH_INJECT_KEY(0);
THREEFISH_ENC_8_ROUNDS(1,2);
THREEFISH_ENC_8_ROUNDS(3,4);
THREEFISH_ENC_8_ROUNDS(5,6);
THREEFISH_ENC_8_ROUNDS(7,8);
THREEFISH_ENC_8_ROUNDS(9,10);
THREEFISH_ENC_8_ROUNDS(11,12);
THREEFISH_ENC_8_ROUNDS(13,14);
THREEFISH_ENC_8_ROUNDS(15,16);
THREEFISH_ENC_8_ROUNDS(17,18);
m_K[0] = M[0] ^ X0;
m_K[1] = M[1] ^ X1;
m_K[2] = M[2] ^ X2;
m_K[3] = M[3] ^ X3;
m_K[4] = M[4] ^ X4;
m_K[5] = M[5] ^ X5;
m_K[6] = M[6] ^ X6;
m_K[7] = M[7] ^ X7;
m_K[8] = m_K[0] ^ m_K[1] ^ m_K[2] ^ m_K[3] ^
m_K[4] ^ m_K[5] ^ m_K[6] ^ m_K[7] ^ 0x1BD11BDAA9FC1A22;
}
void Threefish_512::encrypt_n(const byte in[], byte out[], size_t blocks) const
{
BOTAN_ASSERT(m_K.size() == 9, "Key was set");
BOTAN_ASSERT(m_T.size() == 3, "Tweak was set");
for(size_t i = 0; i != blocks; ++i)
{
u64bit X0 = load_le<u64bit>(in, 0);
u64bit X1 = load_le<u64bit>(in, 1);
u64bit X2 = load_le<u64bit>(in, 2);
u64bit X3 = load_le<u64bit>(in, 3);
u64bit X4 = load_le<u64bit>(in, 4);
u64bit X5 = load_le<u64bit>(in, 5);
u64bit X6 = load_le<u64bit>(in, 6);
u64bit X7 = load_le<u64bit>(in, 7);
THREEFISH_INJECT_KEY(0);
THREEFISH_ENC_8_ROUNDS(1,2);
THREEFISH_ENC_8_ROUNDS(3,4);
THREEFISH_ENC_8_ROUNDS(5,6);
THREEFISH_ENC_8_ROUNDS(7,8);
THREEFISH_ENC_8_ROUNDS(9,10);
THREEFISH_ENC_8_ROUNDS(11,12);
THREEFISH_ENC_8_ROUNDS(13,14);
THREEFISH_ENC_8_ROUNDS(15,16);
THREEFISH_ENC_8_ROUNDS(17,18);
store_le(out, X0, X1, X2, X3, X4, X5, X6, X7);
in += 64;
out += 64;
}
}
#undef THREEFISH_ENC_8_ROUNDS
#undef THREEFISH_INJECT_KEY
#undef THREEFISH_ROUND
void Threefish_512::decrypt_n(const byte in[], byte out[], size_t blocks) const
{
BOTAN_ASSERT(m_K.size() == 9, "Key was set");
BOTAN_ASSERT(m_T.size() == 3, "Tweak was set");
#define THREEFISH_ROUND(X0,X1,X2,X3,X4,X5,X6,X7,ROT1,ROT2,ROT3,ROT4) \
do { \
X4 ^= X0; \
X5 ^= X1; \
X6 ^= X2; \
X7 ^= X3; \
X4 = rotate_right(X4, ROT1); \
X5 = rotate_right(X5, ROT2); \
X6 = rotate_right(X6, ROT3); \
X7 = rotate_right(X7, ROT4); \
X0 -= X4; \
X1 -= X5; \
X2 -= X6; \
X3 -= X7; \
} while(0)
#define THREEFISH_INJECT_KEY(r) \
do { \
X0 -= m_K[(r ) % 9]; \
X1 -= m_K[(r+1) % 9]; \
X2 -= m_K[(r+2) % 9]; \
X3 -= m_K[(r+3) % 9]; \
X4 -= m_K[(r+4) % 9]; \
X5 -= m_K[(r+5) % 9] + m_T[(r ) % 3]; \
X6 -= m_K[(r+6) % 9] + m_T[(r+1) % 3]; \
X7 -= m_K[(r+7) % 9] + (r); \
} while(0)
#define THREEFISH_DEC_8_ROUNDS(R1,R2) \
do { \
THREEFISH_ROUND(X6,X0,X2,X4, X1,X7,X5,X3, 8,35,56,22); \
THREEFISH_ROUND(X4,X6,X0,X2, X1,X3,X5,X7, 25,29,39,43); \
THREEFISH_ROUND(X2,X4,X6,X0, X1,X7,X5,X3, 13,50,10,17); \
THREEFISH_ROUND(X0,X2,X4,X6, X1,X3,X5,X7, 39,30,34,24); \
THREEFISH_INJECT_KEY(R1); \
\
THREEFISH_ROUND(X6,X0,X2,X4, X1,X7,X5,X3, 44, 9,54,56); \
THREEFISH_ROUND(X4,X6,X0,X2, X1,X3,X5,X7, 17,49,36,39); \
THREEFISH_ROUND(X2,X4,X6,X0, X1,X7,X5,X3, 33,27,14,42); \
THREEFISH_ROUND(X0,X2,X4,X6, X1,X3,X5,X7, 46,36,19,37); \
THREEFISH_INJECT_KEY(R2); \
} while(0)
for(size_t i = 0; i != blocks; ++i)
{
u64bit X0 = load_le<u64bit>(in, 0);
u64bit X1 = load_le<u64bit>(in, 1);
u64bit X2 = load_le<u64bit>(in, 2);
u64bit X3 = load_le<u64bit>(in, 3);
u64bit X4 = load_le<u64bit>(in, 4);
u64bit X5 = load_le<u64bit>(in, 5);
u64bit X6 = load_le<u64bit>(in, 6);
u64bit X7 = load_le<u64bit>(in, 7);
THREEFISH_INJECT_KEY(18);
THREEFISH_DEC_8_ROUNDS(17,16);
THREEFISH_DEC_8_ROUNDS(15,14);
THREEFISH_DEC_8_ROUNDS(13,12);
THREEFISH_DEC_8_ROUNDS(11,10);
THREEFISH_DEC_8_ROUNDS(9,8);
THREEFISH_DEC_8_ROUNDS(7,6);
THREEFISH_DEC_8_ROUNDS(5,4);
THREEFISH_DEC_8_ROUNDS(3,2);
THREEFISH_DEC_8_ROUNDS(1,0);
store_le(out, X0, X1, X2, X3, X4, X5, X6, X7);
in += 64;
out += 64;
}
#undef THREEFISH_DEC_8_ROUNDS
#undef THREEFISH_INJECT_KEY
#undef THREEFISH_ROUND
}
void Threefish_512::set_tweak(const byte tweak[], size_t len)
{
if(len != 16)
throw std::runtime_error("Unsupported twofish tweak length");
m_T.resize(3);
m_T[0] = load_le<u64bit>(tweak, 0);
m_T[1] = load_le<u64bit>(tweak, 1);
m_T[2] = m_T[0] ^ m_T[1];
}
void Threefish_512::key_schedule(const byte key[], size_t)
{
// todo: define key schedule for smaller keys
m_K.resize(9);
for(size_t i = 0; i != 8; ++i)
m_K[i] = load_le<u64bit>(key, i);
m_K[8] = m_K[0] ^ m_K[1] ^ m_K[2] ^ m_K[3] ^
m_K[4] ^ m_K[5] ^ m_K[6] ^ m_K[7] ^ 0x1BD11BDAA9FC1A22;
// Reset tweak to all zeros on key reset
m_T.resize(3);
zeroise(m_T);
}
void Threefish_512::clear()
{
zeroise(m_K);
zeroise(m_T);
}
}
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