/* * SAFER-SK * (C) 1999-2009 Jack Lloyd * * Botan is released under the Simplified BSD License (see license.txt) */ #include #include #include namespace Botan { namespace { const byte EXP[256] = { 0x01, 0x2D, 0xE2, 0x93, 0xBE, 0x45, 0x15, 0xAE, 0x78, 0x03, 0x87, 0xA4, 0xB8, 0x38, 0xCF, 0x3F, 0x08, 0x67, 0x09, 0x94, 0xEB, 0x26, 0xA8, 0x6B, 0xBD, 0x18, 0x34, 0x1B, 0xBB, 0xBF, 0x72, 0xF7, 0x40, 0x35, 0x48, 0x9C, 0x51, 0x2F, 0x3B, 0x55, 0xE3, 0xC0, 0x9F, 0xD8, 0xD3, 0xF3, 0x8D, 0xB1, 0xFF, 0xA7, 0x3E, 0xDC, 0x86, 0x77, 0xD7, 0xA6, 0x11, 0xFB, 0xF4, 0xBA, 0x92, 0x91, 0x64, 0x83, 0xF1, 0x33, 0xEF, 0xDA, 0x2C, 0xB5, 0xB2, 0x2B, 0x88, 0xD1, 0x99, 0xCB, 0x8C, 0x84, 0x1D, 0x14, 0x81, 0x97, 0x71, 0xCA, 0x5F, 0xA3, 0x8B, 0x57, 0x3C, 0x82, 0xC4, 0x52, 0x5C, 0x1C, 0xE8, 0xA0, 0x04, 0xB4, 0x85, 0x4A, 0xF6, 0x13, 0x54, 0xB6, 0xDF, 0x0C, 0x1A, 0x8E, 0xDE, 0xE0, 0x39, 0xFC, 0x20, 0x9B, 0x24, 0x4E, 0xA9, 0x98, 0x9E, 0xAB, 0xF2, 0x60, 0xD0, 0x6C, 0xEA, 0xFA, 0xC7, 0xD9, 0x00, 0xD4, 0x1F, 0x6E, 0x43, 0xBC, 0xEC, 0x53, 0x89, 0xFE, 0x7A, 0x5D, 0x49, 0xC9, 0x32, 0xC2, 0xF9, 0x9A, 0xF8, 0x6D, 0x16, 0xDB, 0x59, 0x96, 0x44, 0xE9, 0xCD, 0xE6, 0x46, 0x42, 0x8F, 0x0A, 0xC1, 0xCC, 0xB9, 0x65, 0xB0, 0xD2, 0xC6, 0xAC, 0x1E, 0x41, 0x62, 0x29, 0x2E, 0x0E, 0x74, 0x50, 0x02, 0x5A, 0xC3, 0x25, 0x7B, 0x8A, 0x2A, 0x5B, 0xF0, 0x06, 0x0D, 0x47, 0x6F, 0x70, 0x9D, 0x7E, 0x10, 0xCE, 0x12, 0x27, 0xD5, 0x4C, 0x4F, 0xD6, 0x79, 0x30, 0x68, 0x36, 0x75, 0x7D, 0xE4, 0xED, 0x80, 0x6A, 0x90, 0x37, 0xA2, 0x5E, 0x76, 0xAA, 0xC5, 0x7F, 0x3D, 0xAF, 0xA5, 0xE5, 0x19, 0x61, 0xFD, 0x4D, 0x7C, 0xB7, 0x0B, 0xEE, 0xAD, 0x4B, 0x22, 0xF5, 0xE7, 0x73, 0x23, 0x21, 0xC8, 0x05, 0xE1, 0x66, 0xDD, 0xB3, 0x58, 0x69, 0x63, 0x56, 0x0F, 0xA1, 0x31, 0x95, 0x17, 0x07, 0x3A, 0x28 }; const byte LOG[512] = { 0x80, 0x00, 0xB0, 0x09, 0x60, 0xEF, 0xB9, 0xFD, 0x10, 0x12, 0x9F, 0xE4, 0x69, 0xBA, 0xAD, 0xF8, 0xC0, 0x38, 0xC2, 0x65, 0x4F, 0x06, 0x94, 0xFC, 0x19, 0xDE, 0x6A, 0x1B, 0x5D, 0x4E, 0xA8, 0x82, 0x70, 0xED, 0xE8, 0xEC, 0x72, 0xB3, 0x15, 0xC3, 0xFF, 0xAB, 0xB6, 0x47, 0x44, 0x01, 0xAC, 0x25, 0xC9, 0xFA, 0x8E, 0x41, 0x1A, 0x21, 0xCB, 0xD3, 0x0D, 0x6E, 0xFE, 0x26, 0x58, 0xDA, 0x32, 0x0F, 0x20, 0xA9, 0x9D, 0x84, 0x98, 0x05, 0x9C, 0xBB, 0x22, 0x8C, 0x63, 0xE7, 0xC5, 0xE1, 0x73, 0xC6, 0xAF, 0x24, 0x5B, 0x87, 0x66, 0x27, 0xF7, 0x57, 0xF4, 0x96, 0xB1, 0xB7, 0x5C, 0x8B, 0xD5, 0x54, 0x79, 0xDF, 0xAA, 0xF6, 0x3E, 0xA3, 0xF1, 0x11, 0xCA, 0xF5, 0xD1, 0x17, 0x7B, 0x93, 0x83, 0xBC, 0xBD, 0x52, 0x1E, 0xEB, 0xAE, 0xCC, 0xD6, 0x35, 0x08, 0xC8, 0x8A, 0xB4, 0xE2, 0xCD, 0xBF, 0xD9, 0xD0, 0x50, 0x59, 0x3F, 0x4D, 0x62, 0x34, 0x0A, 0x48, 0x88, 0xB5, 0x56, 0x4C, 0x2E, 0x6B, 0x9E, 0xD2, 0x3D, 0x3C, 0x03, 0x13, 0xFB, 0x97, 0x51, 0x75, 0x4A, 0x91, 0x71, 0x23, 0xBE, 0x76, 0x2A, 0x5F, 0xF9, 0xD4, 0x55, 0x0B, 0xDC, 0x37, 0x31, 0x16, 0x74, 0xD7, 0x77, 0xA7, 0xE6, 0x07, 0xDB, 0xA4, 0x2F, 0x46, 0xF3, 0x61, 0x45, 0x67, 0xE3, 0x0C, 0xA2, 0x3B, 0x1C, 0x85, 0x18, 0x04, 0x1D, 0x29, 0xA0, 0x8F, 0xB2, 0x5A, 0xD8, 0xA6, 0x7E, 0xEE, 0x8D, 0x53, 0x4B, 0xA1, 0x9A, 0xC1, 0x0E, 0x7A, 0x49, 0xA5, 0x2C, 0x81, 0xC4, 0xC7, 0x36, 0x2B, 0x7F, 0x43, 0x95, 0x33, 0xF2, 0x6C, 0x68, 0x6D, 0xF0, 0x02, 0x28, 0xCE, 0xDD, 0x9B, 0xEA, 0x5E, 0x99, 0x7C, 0x14, 0x86, 0xCF, 0xE5, 0x42, 0xB8, 0x40, 0x78, 0x2D, 0x3A, 0xE9, 0x64, 0x1F, 0x92, 0x90, 0x7D, 0x39, 0x6F, 0xE0, 0x89, 0x30, 0x80, 0x00, 0xB0, 0x09, 0x60, 0xEF, 0xB9, 0xFD, 0x10, 0x12, 0x9F, 0xE4, 0x69, 0xBA, 0xAD, 0xF8, 0xC0, 0x38, 0xC2, 0x65, 0x4F, 0x06, 0x94, 0xFC, 0x19, 0xDE, 0x6A, 0x1B, 0x5D, 0x4E, 0xA8, 0x82, 0x70, 0xED, 0xE8, 0xEC, 0x72, 0xB3, 0x15, 0xC3, 0xFF, 0xAB, 0xB6, 0x47, 0x44, 0x01, 0xAC, 0x25, 0xC9, 0xFA, 0x8E, 0x41, 0x1A, 0x21, 0xCB, 0xD3, 0x0D, 0x6E, 0xFE, 0x26, 0x58, 0xDA, 0x32, 0x0F, 0x20, 0xA9, 0x9D, 0x84, 0x98, 0x05, 0x9C, 0xBB, 0x22, 0x8C, 0x63, 0xE7, 0xC5, 0xE1, 0x73, 0xC6, 0xAF, 0x24, 0x5B, 0x87, 0x66, 0x27, 0xF7, 0x57, 0xF4, 0x96, 0xB1, 0xB7, 0x5C, 0x8B, 0xD5, 0x54, 0x79, 0xDF, 0xAA, 0xF6, 0x3E, 0xA3, 0xF1, 0x11, 0xCA, 0xF5, 0xD1, 0x17, 0x7B, 0x93, 0x83, 0xBC, 0xBD, 0x52, 0x1E, 0xEB, 0xAE, 0xCC, 0xD6, 0x35, 0x08, 0xC8, 0x8A, 0xB4, 0xE2, 0xCD, 0xBF, 0xD9, 0xD0, 0x50, 0x59, 0x3F, 0x4D, 0x62, 0x34, 0x0A, 0x48, 0x88, 0xB5, 0x56, 0x4C, 0x2E, 0x6B, 0x9E, 0xD2, 0x3D, 0x3C, 0x03, 0x13, 0xFB, 0x97, 0x51, 0x75, 0x4A, 0x91, 0x71, 0x23, 0xBE, 0x76, 0x2A, 0x5F, 0xF9, 0xD4, 0x55, 0x0B, 0xDC, 0x37, 0x31, 0x16, 0x74, 0xD7, 0x77, 0xA7, 0xE6, 0x07, 0xDB, 0xA4, 0x2F, 0x46, 0xF3, 0x61, 0x45, 0x67, 0xE3, 0x0C, 0xA2, 0x3B, 0x1C, 0x85, 0x18, 0x04, 0x1D, 0x29, 0xA0, 0x8F, 0xB2, 0x5A, 0xD8, 0xA6, 0x7E, 0xEE, 0x8D, 0x53, 0x4B, 0xA1, 0x9A, 0xC1, 0x0E, 0x7A, 0x49, 0xA5, 0x2C, 0x81, 0xC4, 0xC7, 0x36, 0x2B, 0x7F, 0x43, 0x95, 0x33, 0xF2, 0x6C, 0x68, 0x6D, 0xF0, 0x02, 0x28, 0xCE, 0xDD, 0x9B, 0xEA, 0x5E, 0x99, 0x7C, 0x14, 0x86, 0xCF, 0xE5, 0x42, 0xB8, 0x40, 0x78, 0x2D, 0x3A, 0xE9, 0x64, 0x1F, 0x92, 0x90, 0x7D, 0x39, 0x6F, 0xE0, 0x89, 0x30 }; } /* * SAFER-SK Encryption */ void SAFER_SK::encrypt_n(const byte in[], byte out[], size_t blocks) const { for(size_t i = 0; i != blocks; ++i) { byte A = in[0], B = in[1], C = in[2], D = in[3], E = in[4], F = in[5], G = in[6], H = in[7], X, Y; for(size_t j = 0; j != 16*rounds; j += 16) { A = EXP[A ^ EK[j ]]; B = LOG[B + EK[j+1]]; C = LOG[C + EK[j+2]]; D = EXP[D ^ EK[j+3]]; E = EXP[E ^ EK[j+4]]; F = LOG[F + EK[j+5]]; G = LOG[G + EK[j+6]]; H = EXP[H ^ EK[j+7]]; A += EK[j+ 8]; B ^= EK[j+ 9]; C ^= EK[j+10]; D += EK[j+11]; E += EK[j+12]; F ^= EK[j+13]; G ^= EK[j+14]; H += EK[j+15]; B += A; D += C; F += E; H += G; A += B; C += D; E += F; G += H; C += A; G += E; D += B; H += F; A += C; E += G; B += D; F += H; H += D; Y = D + H; D = B + F; X = B + D; B = A + E; A += B; F = C + G; E = C + F; C = X; G = Y; } out[0] = A ^ EK[16*rounds+0]; out[1] = B + EK[16*rounds+1]; out[2] = C + EK[16*rounds+2]; out[3] = D ^ EK[16*rounds+3]; out[4] = E ^ EK[16*rounds+4]; out[5] = F + EK[16*rounds+5]; out[6] = G + EK[16*rounds+6]; out[7] = H ^ EK[16*rounds+7]; in += BLOCK_SIZE; out += BLOCK_SIZE; } } /* * SAFER-SK Decryption */ void SAFER_SK::decrypt_n(const byte in[], byte out[], size_t blocks) const { for(size_t i = 0; i != blocks; ++i) { byte A = in[0], B = in[1], C = in[2], D = in[3], E = in[4], F = in[5], G = in[6], H = in[7]; A ^= EK[16*rounds+0]; B -= EK[16*rounds+1]; C -= EK[16*rounds+2]; D ^= EK[16*rounds+3]; E ^= EK[16*rounds+4]; F -= EK[16*rounds+5]; G -= EK[16*rounds+6]; H ^= EK[16*rounds+7]; for(s32bit j = 16*(rounds-1); j >= 0; j -= 16) { byte T = E; E = B; B = C; C = T; T = F; F = D; D = G; G = T; A -= E; B -= F; C -= G; D -= H; E -= A; F -= B; G -= C; H -= D; A -= C; E -= G; B -= D; F -= H; C -= A; G -= E; D -= B; H -= F; A -= B; C -= D; E -= F; G -= H; B -= A; D -= C; F -= E; H -= G; A = LOG[A - EK[j+8 ] + 256]; B = EXP[B ^ EK[j+9 ]]; C = EXP[C ^ EK[j+10]]; D = LOG[D - EK[j+11] + 256]; E = LOG[E - EK[j+12] + 256]; F = EXP[F ^ EK[j+13]]; G = EXP[G ^ EK[j+14]]; H = LOG[H - EK[j+15] + 256]; A ^= EK[j+0]; B -= EK[j+1]; C -= EK[j+2]; D ^= EK[j+3]; E ^= EK[j+4]; F -= EK[j+5]; G -= EK[j+6]; H ^= EK[j+7]; } out[0] = A; out[1] = B; out[2] = C; out[3] = D; out[4] = E; out[5] = F; out[6] = G; out[7] = H; in += BLOCK_SIZE; out += BLOCK_SIZE; } } /* * SAFER-SK Key Schedule */ void SAFER_SK::key_schedule(const byte key[], size_t) { const byte BIAS[208] = { 0x16, 0x73, 0x3B, 0x1E, 0x8E, 0x70, 0xBD, 0x86, 0x47, 0x7E, 0x24, 0x56, 0xF1, 0x77, 0x88, 0x46, 0xB1, 0xBA, 0xA3, 0xB7, 0x10, 0x0A, 0xC5, 0x37, 0xC9, 0x5A, 0x28, 0xAC, 0x64, 0xA5, 0xEC, 0xAB, 0xC6, 0x67, 0x95, 0x58, 0x0D, 0xF8, 0x9A, 0xF6, 0x66, 0xDC, 0x05, 0x3D, 0xD3, 0x8A, 0xC3, 0xD8, 0x6A, 0xE9, 0x36, 0x49, 0x43, 0xBF, 0xEB, 0xD4, 0x9B, 0x68, 0xA0, 0x65, 0x5D, 0x57, 0x92, 0x1F, 0x71, 0x5C, 0xBB, 0x22, 0xC1, 0xBE, 0x7B, 0xBC, 0x63, 0x94, 0x5F, 0x2A, 0x61, 0xB8, 0x34, 0x32, 0xFD, 0xFB, 0x17, 0x40, 0xE6, 0x51, 0x1D, 0x41, 0x8F, 0x29, 0xDD, 0x04, 0x80, 0xDE, 0xE7, 0x31, 0x7F, 0x01, 0xA2, 0xF7, 0x39, 0xDA, 0x6F, 0x23, 0xFE, 0x3A, 0xD0, 0x1C, 0xD1, 0x30, 0x3E, 0x12, 0xCD, 0x0F, 0xE0, 0xA8, 0xAF, 0x82, 0x59, 0x2C, 0x7D, 0xAD, 0xB2, 0xEF, 0xC2, 0x87, 0xCE, 0x75, 0x13, 0x02, 0x90, 0x4F, 0x2E, 0x72, 0x33, 0x85, 0x8D, 0xCF, 0xA9, 0x81, 0xE2, 0xC4, 0x27, 0x2F, 0x7A, 0x9F, 0x52, 0xE1, 0x15, 0x38, 0x2B, 0xFC, 0x42, 0xC7, 0x08, 0xE4, 0x09, 0x55, 0x5E, 0x8C, 0x76, 0x60, 0xFF, 0xDF, 0xD7, 0x98, 0xFA, 0x0B, 0x00, 0x1A, 0xF9, 0xA6, 0xB9, 0xE8, 0x9E, 0x62, 0xD9, 0x91, 0x50, 0xD2, 0xEE, 0x18, 0xB4, 0x07, 0xEA, 0x5B, 0xA4, 0xC8, 0x0E, 0xCB, 0x48, 0x69, 0x4E, 0x9C, 0x35, 0x79, 0x45, 0x4D, 0x54, 0xE5, 0x3C, 0x0C, 0x4A, 0x8B, 0x3F, 0xCC, 0xA7, 0xDB }; const byte KEY_INDEX[208] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x09, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x00, 0x01, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x09, 0x0A, 0x0B, 0x05, 0x06, 0x07, 0x08, 0x00, 0x01, 0x02, 0x03, 0x0F, 0x10, 0x11, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x07, 0x08, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x11, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x00, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x09, 0x0A, 0x04, 0x05, 0x06, 0x07, 0x08, 0x00, 0x01, 0x02, 0x0E, 0x0F, 0x10, 0x11, 0x09, 0x0A, 0x0B, 0x0C, 0x06, 0x07, 0x08, 0x00, 0x01, 0x02, 0x03, 0x04, 0x10, 0x11, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x08, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x09, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x00, 0x01, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x09, 0x0A, 0x0B, 0x05, 0x06, 0x07, 0x08, 0x00, 0x01, 0x02, 0x03, 0x0F, 0x10, 0x11, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x07, 0x08, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x11, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F }; EK.resize(16 * rounds + 8); secure_vector KB(18); for(size_t i = 0; i != 8; ++i) { KB[ 8] ^= KB[i] = rotate_left(key[i], 5); KB[17] ^= KB[i+9] = EK[i] = key[i+8]; } for(size_t i = 0; i != rounds; ++i) { for(size_t j = 0; j != 18; ++j) KB[j] = rotate_left(KB[j], 6); for(size_t j = 0; j != 16; ++j) EK[16*i+j+8] = KB[KEY_INDEX[16*i+j]] + BIAS[16*i+j]; } } void SAFER_SK::clear() { zap(EK); } /* * Return the name of this type */ std::string SAFER_SK::name() const { return "SAFER-SK(" + std::to_string(rounds) + ")"; } /* * Return a clone of this object */ BlockCipher* SAFER_SK::clone() const { return new SAFER_SK(rounds); } /* * SAFER-SK Constructor */ SAFER_SK::SAFER_SK(size_t r) : rounds(r) { if(rounds > 13 || rounds == 0) throw Invalid_Argument(name() + ": Invalid number of rounds"); } }