diff options
Diffstat (limited to 'src/block/kasumi/kasumi.cpp')
| -rw-r--r-- | src/block/kasumi/kasumi.cpp | 110 |
1 files changed, 61 insertions, 49 deletions
diff --git a/src/block/kasumi/kasumi.cpp b/src/block/kasumi/kasumi.cpp index e051ddefb..dff6db13c 100644 --- a/src/block/kasumi/kasumi.cpp +++ b/src/block/kasumi/kasumi.cpp @@ -109,79 +109,91 @@ u16bit FI(u16bit I, u16bit K) /* * KASUMI Encryption */ -void KASUMI::enc(const byte in[], byte out[]) const +void KASUMI::encrypt_n(const byte in[], byte out[], u32bit blocks) const { - u16bit B0 = load_be<u16bit>(in, 0); - u16bit B1 = load_be<u16bit>(in, 1); - u16bit B2 = load_be<u16bit>(in, 2); - u16bit B3 = load_be<u16bit>(in, 3); - - for(u32bit j = 0; j != 8; j += 2) + for(u32bit i = 0; i != blocks; ++i) { - const u16bit* K = EK + 8*j; + u16bit B0 = load_be<u16bit>(in, 0); + u16bit B1 = load_be<u16bit>(in, 1); + u16bit B2 = load_be<u16bit>(in, 2); + u16bit B3 = load_be<u16bit>(in, 3); - u16bit R = B1 ^ (rotate_left(B0, 1) & K[0]); - u16bit L = B0 ^ (rotate_left(R, 1) | K[1]); + for(u32bit j = 0; j != 8; j += 2) + { + const u16bit* K = EK + 8*j; - L = FI(L ^ K[ 2], K[ 3]) ^ R; - R = FI(R ^ K[ 4], K[ 5]) ^ L; - L = FI(L ^ K[ 6], K[ 7]) ^ R; + u16bit R = B1 ^ (rotate_left(B0, 1) & K[0]); + u16bit L = B0 ^ (rotate_left(R, 1) | K[1]); - R = B2 ^= R; - L = B3 ^= L; + L = FI(L ^ K[ 2], K[ 3]) ^ R; + R = FI(R ^ K[ 4], K[ 5]) ^ L; + L = FI(L ^ K[ 6], K[ 7]) ^ R; - R = FI(R ^ K[10], K[11]) ^ L; - L = FI(L ^ K[12], K[13]) ^ R; - R = FI(R ^ K[14], K[15]) ^ L; + R = B2 ^= R; + L = B3 ^= L; - R ^= (rotate_left(L, 1) & K[8]); - L ^= (rotate_left(R, 1) | K[9]); + R = FI(R ^ K[10], K[11]) ^ L; + L = FI(L ^ K[12], K[13]) ^ R; + R = FI(R ^ K[14], K[15]) ^ L; - B0 ^= L; - B1 ^= R; - } + R ^= (rotate_left(L, 1) & K[8]); + L ^= (rotate_left(R, 1) | K[9]); + + B0 ^= L; + B1 ^= R; + } - store_be(out, B0, B1, B2, B3); + store_be(out, B0, B1, B2, B3); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* * KASUMI Decryption */ -void KASUMI::dec(const byte in[], byte out[]) const +void KASUMI::decrypt_n(const byte in[], byte out[], u32bit blocks) const { - u16bit B0 = load_be<u16bit>(in, 0); - u16bit B1 = load_be<u16bit>(in, 1); - u16bit B2 = load_be<u16bit>(in, 2); - u16bit B3 = load_be<u16bit>(in, 3); - - for(u32bit j = 0; j != 8; j += 2) + for(u32bit i = 0; i != blocks; ++i) { - const u16bit* K = EK + 8*(6-j); + u16bit B0 = load_be<u16bit>(in, 0); + u16bit B1 = load_be<u16bit>(in, 1); + u16bit B2 = load_be<u16bit>(in, 2); + u16bit B3 = load_be<u16bit>(in, 3); - u16bit L = B2, R = B3; + for(u32bit j = 0; j != 8; j += 2) + { + const u16bit* K = EK + 8*(6-j); - L = FI(L ^ K[10], K[11]) ^ R; - R = FI(R ^ K[12], K[13]) ^ L; - L = FI(L ^ K[14], K[15]) ^ R; + u16bit L = B2, R = B3; - L ^= (rotate_left(R, 1) & K[8]); - R ^= (rotate_left(L, 1) | K[9]); + L = FI(L ^ K[10], K[11]) ^ R; + R = FI(R ^ K[12], K[13]) ^ L; + L = FI(L ^ K[14], K[15]) ^ R; - R = B0 ^= R; - L = B1 ^= L; + L ^= (rotate_left(R, 1) & K[8]); + R ^= (rotate_left(L, 1) | K[9]); - L ^= (rotate_left(R, 1) & K[0]); - R ^= (rotate_left(L, 1) | K[1]); + R = B0 ^= R; + L = B1 ^= L; - R = FI(R ^ K[2], K[3]) ^ L; - L = FI(L ^ K[4], K[5]) ^ R; - R = FI(R ^ K[6], K[7]) ^ L; + L ^= (rotate_left(R, 1) & K[0]); + R ^= (rotate_left(L, 1) | K[1]); - B2 ^= L; - B3 ^= R; - } + R = FI(R ^ K[2], K[3]) ^ L; + L = FI(L ^ K[4], K[5]) ^ R; + R = FI(R ^ K[6], K[7]) ^ L; + + B2 ^= L; + B3 ^= R; + } - store_be(out, B0, B1, B2, B3); + store_be(out, B0, B1, B2, B3); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* |