/* * Threefish-512 * (C) 2013,2014 Jack Lloyd * * Botan is released under the Simplified BSD License (see license.txt) */ #include #include 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& M, const secure_vector& 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(in, 0); u64bit X1 = load_le(in, 1); u64bit X2 = load_le(in, 2); u64bit X3 = load_le(in, 3); u64bit X4 = load_le(in, 4); u64bit X5 = load_le(in, 5); u64bit X6 = load_le(in, 6); u64bit X7 = load_le(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(in, 0); u64bit X1 = load_le(in, 1); u64bit X2 = load_le(in, 2); u64bit X3 = load_le(in, 3); u64bit X4 = load_le(in, 4); u64bit X5 = load_le(in, 5); u64bit X6 = load_le(in, 6); u64bit X7 = load_le(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(tweak, 0); m_T[1] = load_le(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(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); } }