diff options
Diffstat (limited to 'src/block/twofish/twofish.cpp')
| -rw-r--r-- | src/block/twofish/twofish.cpp | 156 |
1 files changed, 84 insertions, 72 deletions
diff --git a/src/block/twofish/twofish.cpp b/src/block/twofish/twofish.cpp index 9784b00a2..6a482a8f3 100644 --- a/src/block/twofish/twofish.cpp +++ b/src/block/twofish/twofish.cpp @@ -14,91 +14,103 @@ namespace Botan { /* * Twofish Encryption */ -void Twofish::enc(const byte in[], byte out[]) const +void Twofish::encrypt_n(const byte in[], byte out[], u32bit blocks) const { - u32bit A = load_le<u32bit>(in, 0) ^ round_key[0]; - u32bit B = load_le<u32bit>(in, 1) ^ round_key[1]; - u32bit C = load_le<u32bit>(in, 2) ^ round_key[2]; - u32bit D = load_le<u32bit>(in, 3) ^ round_key[3]; - - for(u32bit j = 0; j != 16; j += 2) + for(u32bit i = 0; i != blocks; ++i) { - u32bit X, Y; - - X = SBox0[get_byte(3, A)] ^ SBox1[get_byte(2, A)] ^ - SBox2[get_byte(1, A)] ^ SBox3[get_byte(0, A)]; - Y = SBox0[get_byte(0, B)] ^ SBox1[get_byte(3, B)] ^ - SBox2[get_byte(2, B)] ^ SBox3[get_byte(1, B)]; - X += Y; - Y += X + round_key[2*j + 9]; - X += round_key[2*j + 8]; - - C = rotate_right(C ^ X, 1); - D = rotate_left(D, 1) ^ Y; - - X = SBox0[get_byte(3, C)] ^ SBox1[get_byte(2, C)] ^ - SBox2[get_byte(1, C)] ^ SBox3[get_byte(0, C)]; - Y = SBox0[get_byte(0, D)] ^ SBox1[get_byte(3, D)] ^ - SBox2[get_byte(2, D)] ^ SBox3[get_byte(1, D)]; - X += Y; - Y += X + round_key[2*j + 11]; - X += round_key[2*j + 10]; - - A = rotate_right(A ^ X, 1); - B = rotate_left(B, 1) ^ Y; - } + u32bit A = load_le<u32bit>(in, 0) ^ round_key[0]; + u32bit B = load_le<u32bit>(in, 1) ^ round_key[1]; + u32bit C = load_le<u32bit>(in, 2) ^ round_key[2]; + u32bit D = load_le<u32bit>(in, 3) ^ round_key[3]; - C ^= round_key[4]; - D ^= round_key[5]; - A ^= round_key[6]; - B ^= round_key[7]; + for(u32bit j = 0; j != 16; j += 2) + { + u32bit X, Y; + + X = SBox0[get_byte(3, A)] ^ SBox1[get_byte(2, A)] ^ + SBox2[get_byte(1, A)] ^ SBox3[get_byte(0, A)]; + Y = SBox0[get_byte(0, B)] ^ SBox1[get_byte(3, B)] ^ + SBox2[get_byte(2, B)] ^ SBox3[get_byte(1, B)]; + X += Y; + Y += X + round_key[2*j + 9]; + X += round_key[2*j + 8]; + + C = rotate_right(C ^ X, 1); + D = rotate_left(D, 1) ^ Y; + + X = SBox0[get_byte(3, C)] ^ SBox1[get_byte(2, C)] ^ + SBox2[get_byte(1, C)] ^ SBox3[get_byte(0, C)]; + Y = SBox0[get_byte(0, D)] ^ SBox1[get_byte(3, D)] ^ + SBox2[get_byte(2, D)] ^ SBox3[get_byte(1, D)]; + X += Y; + Y += X + round_key[2*j + 11]; + X += round_key[2*j + 10]; + + A = rotate_right(A ^ X, 1); + B = rotate_left(B, 1) ^ Y; + } - store_le(out, C, D, A, B); + C ^= round_key[4]; + D ^= round_key[5]; + A ^= round_key[6]; + B ^= round_key[7]; + + store_le(out, C, D, A, B); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* * Twofish Decryption */ -void Twofish::dec(const byte in[], byte out[]) const +void Twofish::decrypt_n(const byte in[], byte out[], u32bit blocks) const { - u32bit A = load_le<u32bit>(in, 0) ^ round_key[4]; - u32bit B = load_le<u32bit>(in, 1) ^ round_key[5]; - u32bit C = load_le<u32bit>(in, 2) ^ round_key[6]; - u32bit D = load_le<u32bit>(in, 3) ^ round_key[7]; - - for(u32bit j = 0; j != 16; j += 2) + for(u32bit i = 0; i != blocks; ++i) { - u32bit X, Y; - - X = SBox0[get_byte(3, A)] ^ SBox1[get_byte(2, A)] ^ - SBox2[get_byte(1, A)] ^ SBox3[get_byte(0, A)]; - Y = SBox0[get_byte(0, B)] ^ SBox1[get_byte(3, B)] ^ - SBox2[get_byte(2, B)] ^ SBox3[get_byte(1, B)]; - X += Y; - Y += X + round_key[39 - 2*j]; - X += round_key[38 - 2*j]; - - C = rotate_left(C, 1) ^ X; - D = rotate_right(D ^ Y, 1); - - X = SBox0[get_byte(3, C)] ^ SBox1[get_byte(2, C)] ^ - SBox2[get_byte(1, C)] ^ SBox3[get_byte(0, C)]; - Y = SBox0[get_byte(0, D)] ^ SBox1[get_byte(3, D)] ^ - SBox2[get_byte(2, D)] ^ SBox3[get_byte(1, D)]; - X += Y; - Y += X + round_key[37 - 2*j]; - X += round_key[36 - 2*j]; - - A = rotate_left(A, 1) ^ X; - B = rotate_right(B ^ Y, 1); - } + u32bit A = load_le<u32bit>(in, 0) ^ round_key[4]; + u32bit B = load_le<u32bit>(in, 1) ^ round_key[5]; + u32bit C = load_le<u32bit>(in, 2) ^ round_key[6]; + u32bit D = load_le<u32bit>(in, 3) ^ round_key[7]; - C ^= round_key[0]; - D ^= round_key[1]; - A ^= round_key[2]; - B ^= round_key[3]; + for(u32bit j = 0; j != 16; j += 2) + { + u32bit X, Y; + + X = SBox0[get_byte(3, A)] ^ SBox1[get_byte(2, A)] ^ + SBox2[get_byte(1, A)] ^ SBox3[get_byte(0, A)]; + Y = SBox0[get_byte(0, B)] ^ SBox1[get_byte(3, B)] ^ + SBox2[get_byte(2, B)] ^ SBox3[get_byte(1, B)]; + X += Y; + Y += X + round_key[39 - 2*j]; + X += round_key[38 - 2*j]; + + C = rotate_left(C, 1) ^ X; + D = rotate_right(D ^ Y, 1); + + X = SBox0[get_byte(3, C)] ^ SBox1[get_byte(2, C)] ^ + SBox2[get_byte(1, C)] ^ SBox3[get_byte(0, C)]; + Y = SBox0[get_byte(0, D)] ^ SBox1[get_byte(3, D)] ^ + SBox2[get_byte(2, D)] ^ SBox3[get_byte(1, D)]; + X += Y; + Y += X + round_key[37 - 2*j]; + X += round_key[36 - 2*j]; + + A = rotate_left(A, 1) ^ X; + B = rotate_right(B ^ Y, 1); + } - store_le(out, C, D, A, B); + C ^= round_key[0]; + D ^= round_key[1]; + A ^= round_key[2]; + B ^= round_key[3]; + + store_le(out, C, D, A, B); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* |