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Diffstat (limited to 'src/lib/block/threefish/threefish.cpp')
| -rw-r--r-- | src/lib/block/threefish/threefish.cpp | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/src/lib/block/threefish/threefish.cpp b/src/lib/block/threefish/threefish.cpp new file mode 100644 index 000000000..587a76a12 --- /dev/null +++ b/src/lib/block/threefish/threefish.cpp @@ -0,0 +1,205 @@ +/* +* Threefish-512 +* (C) 2013 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/threefish.h> +#include <botan/rotate.h> +#include <botan/loadstor.h> + +namespace Botan { + +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"); + +#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) + + 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[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; + } + +void Threefish_512::clear() + { + zeroise(m_K); + zeroise(m_T); + } + +} |