diff options
Diffstat (limited to 'src/block/tea/tea.cpp')
| -rw-r--r-- | src/block/tea/tea.cpp | 52 |
1 files changed, 32 insertions, 20 deletions
diff --git a/src/block/tea/tea.cpp b/src/block/tea/tea.cpp index 2b4212d9c..de30858da 100644 --- a/src/block/tea/tea.cpp +++ b/src/block/tea/tea.cpp @@ -13,37 +13,49 @@ namespace Botan { /* * TEA Encryption */ -void TEA::enc(const byte in[], byte out[]) const +void TEA::encrypt_n(const byte in[], byte out[], u32bit blocks) const { - u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1); - - u32bit S = 0; - for(u32bit j = 0; j != 32; ++j) + for(u32bit i = 0; i != blocks; ++i) { - S += 0x9E3779B9; - L += ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]); - R += ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]); - } + u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1); + + u32bit S = 0; + for(u32bit j = 0; j != 32; ++j) + { + S += 0x9E3779B9; + L += ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]); + R += ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]); + } - store_be(out, L, R); + store_be(out, L, R); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* * TEA Decryption */ -void TEA::dec(const byte in[], byte out[]) const +void TEA::decrypt_n(const byte in[], byte out[], u32bit blocks) const { - u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1); - - u32bit S = 0xC6EF3720; - for(u32bit j = 0; j != 32; ++j) + for(u32bit i = 0; i != blocks; ++i) { - R -= ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]); - L -= ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]); - S -= 0x9E3779B9; - } + u32bit L = load_be<u32bit>(in, 0), R = load_be<u32bit>(in, 1); + + u32bit S = 0xC6EF3720; + for(u32bit j = 0; j != 32; ++j) + { + R -= ((L << 4) + K[2]) ^ (L + S) ^ ((L >> 5) + K[3]); + L -= ((R << 4) + K[0]) ^ (R + S) ^ ((R >> 5) + K[1]); + S -= 0x9E3779B9; + } - store_be(out, L, R); + store_be(out, L, R); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* |