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Diffstat (limited to 'lib/block/des/des.cpp')
| -rw-r--r-- | lib/block/des/des.cpp | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/lib/block/des/des.cpp b/lib/block/des/des.cpp new file mode 100644 index 000000000..a87b4d6bc --- /dev/null +++ b/lib/block/des/des.cpp @@ -0,0 +1,304 @@ +/* +* DES +* (C) 1999-2008 Jack Lloyd +* +* Based on a public domain implemenation by Phil Karn (who in turn +* credited Richard Outerbridge and Jim Gillogly) +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/des.h> +#include <botan/loadstor.h> +#include <botan/rotate.h> + +namespace Botan { + +namespace { + +/* +* DES Key Schedule +*/ +void des_key_schedule(u32bit round_key[32], const byte key[8]) + { + static const byte ROT[16] = { 1, 1, 2, 2, 2, 2, 2, 2, + 1, 2, 2, 2, 2, 2, 2, 1 }; + + u32bit 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); + u32bit 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); + } + } + +/* +* DES Encryption +*/ +void des_encrypt(u32bit& L, u32bit& R, + const u32bit round_key[32]) + { + for(size_t i = 0; i != 16; i += 2) + { + u32bit T0, T1; + + T0 = rotate_right(R, 4) ^ round_key[2*i]; + T1 = R ^ round_key[2*i + 1]; + + L ^= 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)]; + + T0 = rotate_right(L, 4) ^ round_key[2*i + 2]; + T1 = L ^ round_key[2*i + 3]; + + R ^= 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 Decryption +*/ +void des_decrypt(u32bit& L, u32bit& R, + const u32bit round_key[32]) + { + for(size_t i = 16; i != 0; i -= 2) + { + u32bit T0, T1; + + T0 = rotate_right(R, 4) ^ round_key[2*i - 2]; + T1 = R ^ round_key[2*i - 1]; + + L ^= 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)]; + + T0 = rotate_right(L, 4) ^ round_key[2*i - 4]; + T1 = L ^ round_key[2*i - 3]; + + R ^= 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 +*/ +void DES::encrypt_n(const byte in[], byte out[], size_t blocks) const + { + for(size_t i = 0; i != blocks; ++i) + { + u64bit T = (DES_IPTAB1[in[0]] ) | (DES_IPTAB1[in[1]] << 1) | + (DES_IPTAB1[in[2]] << 2) | (DES_IPTAB1[in[3]] << 3) | + (DES_IPTAB1[in[4]] << 4) | (DES_IPTAB1[in[5]] << 5) | + (DES_IPTAB1[in[6]] << 6) | (DES_IPTAB2[in[7]] ); + + u32bit L = static_cast<u32bit>(T >> 32); + u32bit R = static_cast<u32bit>(T); + + des_encrypt(L, R, &round_key[0]); + + 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 = rotate_left(T, 32); + + store_be(T, out); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } + } + +/* +* DES Decryption +*/ +void DES::decrypt_n(const byte in[], byte out[], size_t blocks) const + { + for(size_t i = 0; i != blocks; ++i) + { + u64bit T = (DES_IPTAB1[in[0]] ) | (DES_IPTAB1[in[1]] << 1) | + (DES_IPTAB1[in[2]] << 2) | (DES_IPTAB1[in[3]] << 3) | + (DES_IPTAB1[in[4]] << 4) | (DES_IPTAB1[in[5]] << 5) | + (DES_IPTAB1[in[6]] << 6) | (DES_IPTAB2[in[7]] ); + + u32bit L = static_cast<u32bit>(T >> 32); + u32bit R = static_cast<u32bit>(T); + + des_decrypt(L, R, &round_key[0]); + + 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 = rotate_left(T, 32); + + store_be(T, out); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } + } + +/* +* DES Key Schedule +*/ +void DES::key_schedule(const byte key[], size_t) + { + round_key.resize(32); + des_key_schedule(&round_key[0], key); + } + +void DES::clear() + { + zap(round_key); + } + +/* +* TripleDES Encryption +*/ +void TripleDES::encrypt_n(const byte in[], byte out[], size_t blocks) const + { + for(size_t i = 0; i != blocks; ++i) + { + u64bit T = (DES_IPTAB1[in[0]] ) | (DES_IPTAB1[in[1]] << 1) | + (DES_IPTAB1[in[2]] << 2) | (DES_IPTAB1[in[3]] << 3) | + (DES_IPTAB1[in[4]] << 4) | (DES_IPTAB1[in[5]] << 5) | + (DES_IPTAB1[in[6]] << 6) | (DES_IPTAB2[in[7]] ); + + u32bit L = static_cast<u32bit>(T >> 32); + u32bit R = static_cast<u32bit>(T); + + des_encrypt(L, R, &round_key[0]); + des_decrypt(R, L, &round_key[32]); + des_encrypt(L, R, &round_key[64]); + + 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 = rotate_left(T, 32); + + store_be(T, out); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } + } + +/* +* TripleDES Decryption +*/ +void TripleDES::decrypt_n(const byte in[], byte out[], size_t blocks) const + { + for(size_t i = 0; i != blocks; ++i) + { + u64bit T = (DES_IPTAB1[in[0]] ) | (DES_IPTAB1[in[1]] << 1) | + (DES_IPTAB1[in[2]] << 2) | (DES_IPTAB1[in[3]] << 3) | + (DES_IPTAB1[in[4]] << 4) | (DES_IPTAB1[in[5]] << 5) | + (DES_IPTAB1[in[6]] << 6) | (DES_IPTAB2[in[7]] ); + + u32bit L = static_cast<u32bit>(T >> 32); + u32bit R = static_cast<u32bit>(T); + + des_decrypt(L, R, &round_key[64]); + des_encrypt(R, L, &round_key[32]); + des_decrypt(L, R, &round_key[0]); + + 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 = rotate_left(T, 32); + + store_be(T, out); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } + } + +/* +* TripleDES Key Schedule +*/ +void TripleDES::key_schedule(const byte key[], size_t length) + { + round_key.resize(3*32); + des_key_schedule(&round_key[0], key); + des_key_schedule(&round_key[32], key + 8); + + if(length == 24) + des_key_schedule(&round_key[64], key + 16); + else + copy_mem(&round_key[64], &round_key[0], 32); + } + +void TripleDES::clear() + { + zap(round_key); + } + +} |