/* * DES * (C) 1999-2008,2018 Jack Lloyd * * Based on a public domain implemenation by Phil Karn (who in turn * credited Richard Outerbridge and Jim Gillogly) * * Botan is released under the Simplified BSD License (see license.txt) */ #include #include #include namespace Botan { namespace { /* * DES Key Schedule */ void des_key_schedule(uint32_t round_key[32], const uint8_t key[8]) { static const uint8_t ROT[16] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; uint32_t C = ((key[7] & 0x80) << 20) | ((key[6] & 0x80) << 19) | ((key[5] & 0x80) << 18) | ((key[4] & 0x80) << 17) | ((key[3] & 0x80) << 16) | ((key[2] & 0x80) << 15) | ((key[1] & 0x80) << 14) | ((key[0] & 0x80) << 13) | ((key[7] & 0x40) << 13) | ((key[6] & 0x40) << 12) | ((key[5] & 0x40) << 11) | ((key[4] & 0x40) << 10) | ((key[3] & 0x40) << 9) | ((key[2] & 0x40) << 8) | ((key[1] & 0x40) << 7) | ((key[0] & 0x40) << 6) | ((key[7] & 0x20) << 6) | ((key[6] & 0x20) << 5) | ((key[5] & 0x20) << 4) | ((key[4] & 0x20) << 3) | ((key[3] & 0x20) << 2) | ((key[2] & 0x20) << 1) | ((key[1] & 0x20) ) | ((key[0] & 0x20) >> 1) | ((key[7] & 0x10) >> 1) | ((key[6] & 0x10) >> 2) | ((key[5] & 0x10) >> 3) | ((key[4] & 0x10) >> 4); uint32_t D = ((key[7] & 0x02) << 26) | ((key[6] & 0x02) << 25) | ((key[5] & 0x02) << 24) | ((key[4] & 0x02) << 23) | ((key[3] & 0x02) << 22) | ((key[2] & 0x02) << 21) | ((key[1] & 0x02) << 20) | ((key[0] & 0x02) << 19) | ((key[7] & 0x04) << 17) | ((key[6] & 0x04) << 16) | ((key[5] & 0x04) << 15) | ((key[4] & 0x04) << 14) | ((key[3] & 0x04) << 13) | ((key[2] & 0x04) << 12) | ((key[1] & 0x04) << 11) | ((key[0] & 0x04) << 10) | ((key[7] & 0x08) << 8) | ((key[6] & 0x08) << 7) | ((key[5] & 0x08) << 6) | ((key[4] & 0x08) << 5) | ((key[3] & 0x08) << 4) | ((key[2] & 0x08) << 3) | ((key[1] & 0x08) << 2) | ((key[0] & 0x08) << 1) | ((key[3] & 0x10) >> 1) | ((key[2] & 0x10) >> 2) | ((key[1] & 0x10) >> 3) | ((key[0] & 0x10) >> 4); for(size_t i = 0; i != 16; ++i) { C = ((C << ROT[i]) | (C >> (28-ROT[i]))) & 0x0FFFFFFF; D = ((D << ROT[i]) | (D >> (28-ROT[i]))) & 0x0FFFFFFF; round_key[2*i ] = ((C & 0x00000010) << 22) | ((C & 0x00000800) << 17) | ((C & 0x00000020) << 16) | ((C & 0x00004004) << 15) | ((C & 0x00000200) << 11) | ((C & 0x00020000) << 10) | ((C & 0x01000000) >> 6) | ((C & 0x00100000) >> 4) | ((C & 0x00010000) << 3) | ((C & 0x08000000) >> 2) | ((C & 0x00800000) << 1) | ((D & 0x00000010) << 8) | ((D & 0x00000002) << 7) | ((D & 0x00000001) << 2) | ((D & 0x00000200) ) | ((D & 0x00008000) >> 2) | ((D & 0x00000088) >> 3) | ((D & 0x00001000) >> 7) | ((D & 0x00080000) >> 9) | ((D & 0x02020000) >> 14) | ((D & 0x00400000) >> 21); round_key[2*i+1] = ((C & 0x00000001) << 28) | ((C & 0x00000082) << 18) | ((C & 0x00002000) << 14) | ((C & 0x00000100) << 10) | ((C & 0x00001000) << 9) | ((C & 0x00040000) << 6) | ((C & 0x02400000) << 4) | ((C & 0x00008000) << 2) | ((C & 0x00200000) >> 1) | ((C & 0x04000000) >> 10) | ((D & 0x00000020) << 6) | ((D & 0x00000100) ) | ((D & 0x00000800) >> 1) | ((D & 0x00000040) >> 3) | ((D & 0x00010000) >> 4) | ((D & 0x00000400) >> 5) | ((D & 0x00004000) >> 10) | ((D & 0x04000000) >> 13) | ((D & 0x00800000) >> 14) | ((D & 0x00100000) >> 18) | ((D & 0x01000000) >> 24) | ((D & 0x08000000) >> 26); } } inline uint32_t spbox(uint32_t T0, uint32_t T1) { return DES_SPBOX1[get_byte(0, T0)] ^ DES_SPBOX2[get_byte(0, T1)] ^ DES_SPBOX3[get_byte(1, T0)] ^ DES_SPBOX4[get_byte(1, T1)] ^ DES_SPBOX5[get_byte(2, T0)] ^ DES_SPBOX6[get_byte(2, T1)] ^ DES_SPBOX7[get_byte(3, T0)] ^ DES_SPBOX8[get_byte(3, T1)]; } /* * DES Encryption */ inline void des_encrypt(uint32_t& Lr, uint32_t& Rr, const uint32_t round_key[32]) { uint32_t L = Lr; uint32_t R = Rr; for(size_t i = 0; i != 16; i += 2) { L ^= spbox(rotr<4>(R) ^ round_key[2*i ], R ^ round_key[2*i+1]); R ^= spbox(rotr<4>(L) ^ round_key[2*i+2], L ^ round_key[2*i+3]); } Lr = L; Rr = R; } inline void des_encrypt_x2(uint32_t& L0r, uint32_t& R0r, uint32_t& L1r, uint32_t& R1r, const uint32_t round_key[32]) { uint32_t L0 = L0r; uint32_t R0 = R0r; uint32_t L1 = L1r; uint32_t R1 = R1r; for(size_t i = 0; i != 16; i += 2) { L0 ^= spbox(rotr<4>(R0) ^ round_key[2*i ], R0 ^ round_key[2*i+1]); L1 ^= spbox(rotr<4>(R1) ^ round_key[2*i ], R1 ^ round_key[2*i+1]); R0 ^= spbox(rotr<4>(L0) ^ round_key[2*i+2], L0 ^ round_key[2*i+3]); R1 ^= spbox(rotr<4>(L1) ^ round_key[2*i+2], L1 ^ round_key[2*i+3]); } L0r = L0; R0r = R0; L1r = L1; R1r = R1; } /* * DES Decryption */ inline void des_decrypt(uint32_t& Lr, uint32_t& Rr, const uint32_t round_key[32]) { uint32_t L = Lr; uint32_t R = Rr; for(size_t i = 16; i != 0; i -= 2) { L ^= spbox(rotr<4>(R) ^ round_key[2*i - 2], R ^ round_key[2*i - 1]); R ^= spbox(rotr<4>(L) ^ round_key[2*i - 4], L ^ round_key[2*i - 3]); } Lr = L; Rr = R; } inline void des_decrypt_x2(uint32_t& L0r, uint32_t& R0r, uint32_t& L1r, uint32_t& R1r, const uint32_t round_key[32]) { uint32_t L0 = L0r; uint32_t R0 = R0r; uint32_t L1 = L1r; uint32_t R1 = R1r; for(size_t i = 16; i != 0; i -= 2) { L0 ^= spbox(rotr<4>(R0) ^ round_key[2*i - 2], R0 ^ round_key[2*i - 1]); L1 ^= spbox(rotr<4>(R1) ^ round_key[2*i - 2], R1 ^ round_key[2*i - 1]); R0 ^= spbox(rotr<4>(L0) ^ round_key[2*i - 4], L0 ^ round_key[2*i - 3]); R1 ^= spbox(rotr<4>(L1) ^ round_key[2*i - 4], L1 ^ round_key[2*i - 3]); } L0r = L0; R0r = R0; L1r = L1; R1r = R1; } inline void des_IP(uint32_t& L, uint32_t& R, const uint8_t block[]) { uint64_t T = (DES_IPTAB1[block[0]] ) | (DES_IPTAB1[block[1]] << 1) | (DES_IPTAB1[block[2]] << 2) | (DES_IPTAB1[block[3]] << 3) | (DES_IPTAB1[block[4]] << 4) | (DES_IPTAB1[block[5]] << 5) | (DES_IPTAB1[block[6]] << 6) | (DES_IPTAB2[block[7]] ); L = static_cast(T >> 32); R = static_cast(T); } inline void des_FP(uint32_t L, uint32_t R, uint8_t out[]) { uint64_t T = (DES_FPTAB1[get_byte(0, L)] << 5) | (DES_FPTAB1[get_byte(1, L)] << 3) | (DES_FPTAB1[get_byte(2, L)] << 1) | (DES_FPTAB2[get_byte(3, L)] << 1) | (DES_FPTAB1[get_byte(0, R)] << 4) | (DES_FPTAB1[get_byte(1, R)] << 2) | (DES_FPTAB1[get_byte(2, R)] ) | (DES_FPTAB2[get_byte(3, R)] ); T = rotl<32>(T); store_be(T, out); } } /* * DES Encryption */ void DES::encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const { verify_key_set(m_round_key.empty() == false); while(blocks >= 2) { uint32_t L0, R0; uint32_t L1, R1; des_IP(L0, R0, in); des_IP(L1, R1, in + BLOCK_SIZE); des_encrypt_x2(L0, R0, L1, R1, m_round_key.data()); des_FP(L0, R0, out); des_FP(L1, R1, out + BLOCK_SIZE); in += 2*BLOCK_SIZE; out += 2*BLOCK_SIZE; blocks -= 2; } for(size_t i = 0; i < blocks; ++i) { uint32_t L, R; des_IP(L, R, in + BLOCK_SIZE*i); des_encrypt(L, R, m_round_key.data()); des_FP(L, R, out + BLOCK_SIZE*i); } } /* * DES Decryption */ void DES::decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const { verify_key_set(m_round_key.empty() == false); while(blocks >= 2) { uint32_t L0, R0; uint32_t L1, R1; des_IP(L0, R0, in); des_IP(L1, R1, in + BLOCK_SIZE); des_decrypt_x2(L0, R0, L1, R1, m_round_key.data()); des_FP(L0, R0, out); des_FP(L1, R1, out + BLOCK_SIZE); in += 2*BLOCK_SIZE; out += 2*BLOCK_SIZE; blocks -= 2; } for(size_t i = 0; i < blocks; ++i) { uint32_t L, R; des_IP(L, R, in + BLOCK_SIZE*i); des_decrypt(L, R, m_round_key.data()); des_FP(L, R, out + BLOCK_SIZE*i); } } /* * DES Key Schedule */ void DES::key_schedule(const uint8_t key[], size_t) { m_round_key.resize(32); des_key_schedule(m_round_key.data(), key); } void DES::clear() { zap(m_round_key); } /* * TripleDES Encryption */ void TripleDES::encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const { verify_key_set(m_round_key.empty() == false); while(blocks >= 2) { uint32_t L0, R0; uint32_t L1, R1; des_IP(L0, R0, in); des_IP(L1, R1, in + BLOCK_SIZE); des_encrypt_x2(L0, R0, L1, R1, &m_round_key[0]); des_decrypt_x2(R0, L0, R1, L1, &m_round_key[32]); des_encrypt_x2(L0, R0, L1, R1, &m_round_key[64]); des_FP(L0, R0, out); des_FP(L1, R1, out + BLOCK_SIZE); in += 2*BLOCK_SIZE; out += 2*BLOCK_SIZE; blocks -= 2; } for(size_t i = 0; i != blocks; ++i) { uint32_t L, R; des_IP(L, R, in + BLOCK_SIZE*i); des_encrypt(L, R, &m_round_key[0]); des_decrypt(R, L, &m_round_key[32]); des_encrypt(L, R, &m_round_key[64]); des_FP(L, R, out + BLOCK_SIZE*i); } } /* * TripleDES Decryption */ void TripleDES::decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const { verify_key_set(m_round_key.empty() == false); while(blocks >= 2) { uint32_t L0, R0; uint32_t L1, R1; des_IP(L0, R0, in); des_IP(L1, R1, in + BLOCK_SIZE); des_decrypt_x2(L0, R0, L1, R1, &m_round_key[64]); des_encrypt_x2(R0, L0, R1, L1, &m_round_key[32]); des_decrypt_x2(L0, R0, L1, R1, &m_round_key[0]); des_FP(L0, R0, out); des_FP(L1, R1, out + BLOCK_SIZE); in += 2*BLOCK_SIZE; out += 2*BLOCK_SIZE; blocks -= 2; } for(size_t i = 0; i != blocks; ++i) { uint32_t L, R; des_IP(L, R, in + BLOCK_SIZE*i); des_decrypt(L, R, &m_round_key[64]); des_encrypt(R, L, &m_round_key[32]); des_decrypt(L, R, &m_round_key[0]); des_FP(L, R, out + BLOCK_SIZE*i); } } /* * TripleDES Key Schedule */ void TripleDES::key_schedule(const uint8_t key[], size_t length) { m_round_key.resize(3*32); des_key_schedule(&m_round_key[0], key); des_key_schedule(&m_round_key[32], key + 8); if(length == 24) des_key_schedule(&m_round_key[64], key + 16); else copy_mem(&m_round_key[64], &m_round_key[0], 32); } void TripleDES::clear() { zap(m_round_key); } }