diff options
Diffstat (limited to 'src/block/xtea/xtea.cpp')
| -rw-r--r-- | src/block/xtea/xtea.cpp | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/src/block/xtea/xtea.cpp b/src/block/xtea/xtea.cpp index 5047f6594..0dba5f2be 100644 --- a/src/block/xtea/xtea.cpp +++ b/src/block/xtea/xtea.cpp @@ -14,33 +14,45 @@ namespace Botan { /* * XTEA Encryption */ -void XTEA::enc(const byte in[], byte out[]) const +void XTEA::encrypt_n(const byte in[], byte out[], u32bit blocks) const { - u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1); - - for(u32bit j = 0; j != 32; ++j) + for(u32bit i = 0; i != blocks; ++i) { - L += (((R << 4) ^ (R >> 5)) + R) ^ EK[2*j]; - R += (((L << 4) ^ (L >> 5)) + L) ^ EK[2*j+1]; - } + u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1); + + for(u32bit j = 0; j != 32; ++j) + { + L += (((R << 4) ^ (R >> 5)) + R) ^ EK[2*j]; + R += (((L << 4) ^ (L >> 5)) + L) ^ EK[2*j+1]; + } - store_be(out, L, R); + store_be(out, L, R); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* * XTEA Decryption */ -void XTEA::dec(const byte in[], byte out[]) const +void XTEA::decrypt_n(const byte in[], byte out[], u32bit blocks) const { - u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1); - - for(u32bit j = 0; j != 32; ++j) + for(u32bit i = 0; i != blocks; ++i) { - R -= (((L << 4) ^ (L >> 5)) + L) ^ EK[63 - 2*j]; - L -= (((R << 4) ^ (R >> 5)) + R) ^ EK[62 - 2*j]; - } + u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1); + + for(u32bit j = 0; j != 32; ++j) + { + R -= (((L << 4) ^ (L >> 5)) + L) ^ EK[63 - 2*j]; + L -= (((R << 4) ^ (R >> 5)) + R) ^ EK[62 - 2*j]; + } - store_be(out, L, R); + store_be(out, L, R); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* |