/* * CAST-256 * (C) 1999-2007 Jack Lloyd * * Botan is released under the Simplified BSD License (see license.txt) */ #include #include #include namespace Botan { namespace { /* * CAST-256 Round Type 1 */ void round1(u32bit& out, u32bit in, u32bit mask, u32bit rot) { u32bit temp = rotate_left(mask + in, rot); out ^= (CAST_SBOX1[get_byte(0, temp)] ^ CAST_SBOX2[get_byte(1, temp)]) - CAST_SBOX3[get_byte(2, temp)] + CAST_SBOX4[get_byte(3, temp)]; } /* * CAST-256 Round Type 2 */ void round2(u32bit& out, u32bit in, u32bit mask, u32bit rot) { u32bit temp = rotate_left(mask ^ in, rot); out ^= (CAST_SBOX1[get_byte(0, temp)] - CAST_SBOX2[get_byte(1, temp)] + CAST_SBOX3[get_byte(2, temp)]) ^ CAST_SBOX4[get_byte(3, temp)]; } /* * CAST-256 Round Type 3 */ void round3(u32bit& out, u32bit in, u32bit mask, u32bit rot) { u32bit temp = rotate_left(mask - in, rot); out ^= ((CAST_SBOX1[get_byte(0, temp)] + CAST_SBOX2[get_byte(1, temp)]) ^ CAST_SBOX3[get_byte(2, temp)]) - CAST_SBOX4[get_byte(3, temp)]; } } /* * CAST-256 Encryption */ void CAST_256::encrypt_n(const byte in[], byte out[], size_t blocks) const { for(size_t i = 0; i != blocks; ++i) { u32bit A = load_be(in, 0); u32bit B = load_be(in, 1); u32bit C = load_be(in, 2); u32bit D = load_be(in, 3); round1(C, D, m_MK[ 0], m_RK[ 0]); round2(B, C, m_MK[ 1], m_RK[ 1]); round3(A, B, m_MK[ 2], m_RK[ 2]); round1(D, A, m_MK[ 3], m_RK[ 3]); round1(C, D, m_MK[ 4], m_RK[ 4]); round2(B, C, m_MK[ 5], m_RK[ 5]); round3(A, B, m_MK[ 6], m_RK[ 6]); round1(D, A, m_MK[ 7], m_RK[ 7]); round1(C, D, m_MK[ 8], m_RK[ 8]); round2(B, C, m_MK[ 9], m_RK[ 9]); round3(A, B, m_MK[10], m_RK[10]); round1(D, A, m_MK[11], m_RK[11]); round1(C, D, m_MK[12], m_RK[12]); round2(B, C, m_MK[13], m_RK[13]); round3(A, B, m_MK[14], m_RK[14]); round1(D, A, m_MK[15], m_RK[15]); round1(C, D, m_MK[16], m_RK[16]); round2(B, C, m_MK[17], m_RK[17]); round3(A, B, m_MK[18], m_RK[18]); round1(D, A, m_MK[19], m_RK[19]); round1(C, D, m_MK[20], m_RK[20]); round2(B, C, m_MK[21], m_RK[21]); round3(A, B, m_MK[22], m_RK[22]); round1(D, A, m_MK[23], m_RK[23]); round1(D, A, m_MK[27], m_RK[27]); round3(A, B, m_MK[26], m_RK[26]); round2(B, C, m_MK[25], m_RK[25]); round1(C, D, m_MK[24], m_RK[24]); round1(D, A, m_MK[31], m_RK[31]); round3(A, B, m_MK[30], m_RK[30]); round2(B, C, m_MK[29], m_RK[29]); round1(C, D, m_MK[28], m_RK[28]); round1(D, A, m_MK[35], m_RK[35]); round3(A, B, m_MK[34], m_RK[34]); round2(B, C, m_MK[33], m_RK[33]); round1(C, D, m_MK[32], m_RK[32]); round1(D, A, m_MK[39], m_RK[39]); round3(A, B, m_MK[38], m_RK[38]); round2(B, C, m_MK[37], m_RK[37]); round1(C, D, m_MK[36], m_RK[36]); round1(D, A, m_MK[43], m_RK[43]); round3(A, B, m_MK[42], m_RK[42]); round2(B, C, m_MK[41], m_RK[41]); round1(C, D, m_MK[40], m_RK[40]); round1(D, A, m_MK[47], m_RK[47]); round3(A, B, m_MK[46], m_RK[46]); round2(B, C, m_MK[45], m_RK[45]); round1(C, D, m_MK[44], m_RK[44]); store_be(out, A, B, C, D); in += BLOCK_SIZE; out += BLOCK_SIZE; } } /* * CAST-256 Decryption */ void CAST_256::decrypt_n(const byte in[], byte out[], size_t blocks) const { for(size_t i = 0; i != blocks; ++i) { u32bit A = load_be(in, 0); u32bit B = load_be(in, 1); u32bit C = load_be(in, 2); u32bit D = load_be(in, 3); round1(C, D, m_MK[44], m_RK[44]); round2(B, C, m_MK[45], m_RK[45]); round3(A, B, m_MK[46], m_RK[46]); round1(D, A, m_MK[47], m_RK[47]); round1(C, D, m_MK[40], m_RK[40]); round2(B, C, m_MK[41], m_RK[41]); round3(A, B, m_MK[42], m_RK[42]); round1(D, A, m_MK[43], m_RK[43]); round1(C, D, m_MK[36], m_RK[36]); round2(B, C, m_MK[37], m_RK[37]); round3(A, B, m_MK[38], m_RK[38]); round1(D, A, m_MK[39], m_RK[39]); round1(C, D, m_MK[32], m_RK[32]); round2(B, C, m_MK[33], m_RK[33]); round3(A, B, m_MK[34], m_RK[34]); round1(D, A, m_MK[35], m_RK[35]); round1(C, D, m_MK[28], m_RK[28]); round2(B, C, m_MK[29], m_RK[29]); round3(A, B, m_MK[30], m_RK[30]); round1(D, A, m_MK[31], m_RK[31]); round1(C, D, m_MK[24], m_RK[24]); round2(B, C, m_MK[25], m_RK[25]); round3(A, B, m_MK[26], m_RK[26]); round1(D, A, m_MK[27], m_RK[27]); round1(D, A, m_MK[23], m_RK[23]); round3(A, B, m_MK[22], m_RK[22]); round2(B, C, m_MK[21], m_RK[21]); round1(C, D, m_MK[20], m_RK[20]); round1(D, A, m_MK[19], m_RK[19]); round3(A, B, m_MK[18], m_RK[18]); round2(B, C, m_MK[17], m_RK[17]); round1(C, D, m_MK[16], m_RK[16]); round1(D, A, m_MK[15], m_RK[15]); round3(A, B, m_MK[14], m_RK[14]); round2(B, C, m_MK[13], m_RK[13]); round1(C, D, m_MK[12], m_RK[12]); round1(D, A, m_MK[11], m_RK[11]); round3(A, B, m_MK[10], m_RK[10]); round2(B, C, m_MK[ 9], m_RK[ 9]); round1(C, D, m_MK[ 8], m_RK[ 8]); round1(D, A, m_MK[ 7], m_RK[ 7]); round3(A, B, m_MK[ 6], m_RK[ 6]); round2(B, C, m_MK[ 5], m_RK[ 5]); round1(C, D, m_MK[ 4], m_RK[ 4]); round1(D, A, m_MK[ 3], m_RK[ 3]); round3(A, B, m_MK[ 2], m_RK[ 2]); round2(B, C, m_MK[ 1], m_RK[ 1]); round1(C, D, m_MK[ 0], m_RK[ 0]); store_be(out, A, B, C, D); in += BLOCK_SIZE; out += BLOCK_SIZE; } } /* * CAST-256 Key Schedule */ void CAST_256::key_schedule(const byte key[], size_t length) { static const u32bit KEY_MASK[192] = { 0x5A827999, 0xC95C653A, 0x383650DB, 0xA7103C7C, 0x15EA281D, 0x84C413BE, 0xF39DFF5F, 0x6277EB00, 0xD151D6A1, 0x402BC242, 0xAF05ADE3, 0x1DDF9984, 0x8CB98525, 0xFB9370C6, 0x6A6D5C67, 0xD9474808, 0x482133A9, 0xB6FB1F4A, 0x25D50AEB, 0x94AEF68C, 0x0388E22D, 0x7262CDCE, 0xE13CB96F, 0x5016A510, 0xBEF090B1, 0x2DCA7C52, 0x9CA467F3, 0x0B7E5394, 0x7A583F35, 0xE9322AD6, 0x580C1677, 0xC6E60218, 0x35BFEDB9, 0xA499D95A, 0x1373C4FB, 0x824DB09C, 0xF1279C3D, 0x600187DE, 0xCEDB737F, 0x3DB55F20, 0xAC8F4AC1, 0x1B693662, 0x8A432203, 0xF91D0DA4, 0x67F6F945, 0xD6D0E4E6, 0x45AAD087, 0xB484BC28, 0x235EA7C9, 0x9238936A, 0x01127F0B, 0x6FEC6AAC, 0xDEC6564D, 0x4DA041EE, 0xBC7A2D8F, 0x2B541930, 0x9A2E04D1, 0x0907F072, 0x77E1DC13, 0xE6BBC7B4, 0x5595B355, 0xC46F9EF6, 0x33498A97, 0xA2237638, 0x10FD61D9, 0x7FD74D7A, 0xEEB1391B, 0x5D8B24BC, 0xCC65105D, 0x3B3EFBFE, 0xAA18E79F, 0x18F2D340, 0x87CCBEE1, 0xF6A6AA82, 0x65809623, 0xD45A81C4, 0x43346D65, 0xB20E5906, 0x20E844A7, 0x8FC23048, 0xFE9C1BE9, 0x6D76078A, 0xDC4FF32B, 0x4B29DECC, 0xBA03CA6D, 0x28DDB60E, 0x97B7A1AF, 0x06918D50, 0x756B78F1, 0xE4456492, 0x531F5033, 0xC1F93BD4, 0x30D32775, 0x9FAD1316, 0x0E86FEB7, 0x7D60EA58, 0xEC3AD5F9, 0x5B14C19A, 0xC9EEAD3B, 0x38C898DC, 0xA7A2847D, 0x167C701E, 0x85565BBF, 0xF4304760, 0x630A3301, 0xD1E41EA2, 0x40BE0A43, 0xAF97F5E4, 0x1E71E185, 0x8D4BCD26, 0xFC25B8C7, 0x6AFFA468, 0xD9D99009, 0x48B37BAA, 0xB78D674B, 0x266752EC, 0x95413E8D, 0x041B2A2E, 0x72F515CF, 0xE1CF0170, 0x50A8ED11, 0xBF82D8B2, 0x2E5CC453, 0x9D36AFF4, 0x0C109B95, 0x7AEA8736, 0xE9C472D7, 0x589E5E78, 0xC7784A19, 0x365235BA, 0xA52C215B, 0x14060CFC, 0x82DFF89D, 0xF1B9E43E, 0x6093CFDF, 0xCF6DBB80, 0x3E47A721, 0xAD2192C2, 0x1BFB7E63, 0x8AD56A04, 0xF9AF55A5, 0x68894146, 0xD7632CE7, 0x463D1888, 0xB5170429, 0x23F0EFCA, 0x92CADB6B, 0x01A4C70C, 0x707EB2AD, 0xDF589E4E, 0x4E3289EF, 0xBD0C7590, 0x2BE66131, 0x9AC04CD2, 0x099A3873, 0x78742414, 0xE74E0FB5, 0x5627FB56, 0xC501E6F7, 0x33DBD298, 0xA2B5BE39, 0x118FA9DA, 0x8069957B, 0xEF43811C, 0x5E1D6CBD, 0xCCF7585E, 0x3BD143FF, 0xAAAB2FA0, 0x19851B41, 0x885F06E2, 0xF738F283, 0x6612DE24, 0xD4ECC9C5, 0x43C6B566, 0xB2A0A107, 0x217A8CA8, 0x90547849, 0xFF2E63EA, 0x6E084F8B, 0xDCE23B2C, 0x4BBC26CD, 0xBA96126E, 0x296FFE0F, 0x9849E9B0, 0x0723D551, 0x75FDC0F2, 0xE4D7AC93, 0x53B19834, 0xC28B83D5, 0x31656F76, 0xA03F5B17, 0x0F1946B8 }; static const byte KEY_ROT[32] = { 0x13, 0x04, 0x15, 0x06, 0x17, 0x08, 0x19, 0x0A, 0x1B, 0x0C, 0x1D, 0x0E, 0x1F, 0x10, 0x01, 0x12, 0x03, 0x14, 0x05, 0x16, 0x07, 0x18, 0x09, 0x1A, 0x0B, 0x1C, 0x0D, 0x1E, 0x0F, 0x00, 0x11, 0x02 }; m_MK.resize(48); m_RK.resize(48); secure_vector K(8); for(size_t i = 0; i != length; ++i) K[i/4] = (K[i/4] << 8) + key[i]; u32bit A = K[0], B = K[1], C = K[2], D = K[3], E = K[4], F = K[5], G = K[6], H = K[7]; for(size_t i = 0; i != 48; i += 4) { round1(G, H, KEY_MASK[4*i+ 0], KEY_ROT[(4*i+ 0) % 32]); round2(F, G, KEY_MASK[4*i+ 1], KEY_ROT[(4*i+ 1) % 32]); round3(E, F, KEY_MASK[4*i+ 2], KEY_ROT[(4*i+ 2) % 32]); round1(D, E, KEY_MASK[4*i+ 3], KEY_ROT[(4*i+ 3) % 32]); round2(C, D, KEY_MASK[4*i+ 4], KEY_ROT[(4*i+ 4) % 32]); round3(B, C, KEY_MASK[4*i+ 5], KEY_ROT[(4*i+ 5) % 32]); round1(A, B, KEY_MASK[4*i+ 6], KEY_ROT[(4*i+ 6) % 32]); round2(H, A, KEY_MASK[4*i+ 7], KEY_ROT[(4*i+ 7) % 32]); round1(G, H, KEY_MASK[4*i+ 8], KEY_ROT[(4*i+ 8) % 32]); round2(F, G, KEY_MASK[4*i+ 9], KEY_ROT[(4*i+ 9) % 32]); round3(E, F, KEY_MASK[4*i+10], KEY_ROT[(4*i+10) % 32]); round1(D, E, KEY_MASK[4*i+11], KEY_ROT[(4*i+11) % 32]); round2(C, D, KEY_MASK[4*i+12], KEY_ROT[(4*i+12) % 32]); round3(B, C, KEY_MASK[4*i+13], KEY_ROT[(4*i+13) % 32]); round1(A, B, KEY_MASK[4*i+14], KEY_ROT[(4*i+14) % 32]); round2(H, A, KEY_MASK[4*i+15], KEY_ROT[(4*i+15) % 32]); m_RK[i ] = (A % 32); m_RK[i+1] = (C % 32); m_RK[i+2] = (E % 32); m_RK[i+3] = (G % 32); m_MK[i ] = H; m_MK[i+1] = F; m_MK[i+2] = D; m_MK[i+3] = B; } } void CAST_256::clear() { zap(m_MK); zap(m_RK); } }