diff options
Diffstat (limited to 'src/block/rc5')
| -rw-r--r-- | src/block/rc5/info.txt | 7 | ||||
| -rw-r--r-- | src/block/rc5/rc5.cpp | 72 | ||||
| -rw-r--r-- | src/block/rc5/rc5.h | 8 |
3 files changed, 47 insertions, 40 deletions
diff --git a/src/block/rc5/info.txt b/src/block/rc5/info.txt index 4a150c3b0..2032b406f 100644 --- a/src/block/rc5/info.txt +++ b/src/block/rc5/info.txt @@ -1,10 +1,3 @@ realname "RC5" define RC5 - -load_on auto - -<add> -rc5.cpp -rc5.h -</add> diff --git a/src/block/rc5/rc5.cpp b/src/block/rc5/rc5.cpp index 5d83d5a4e..4bfa27ea0 100644 --- a/src/block/rc5/rc5.cpp +++ b/src/block/rc5/rc5.cpp @@ -16,47 +16,59 @@ namespace Botan { /* * RC5 Encryption */ -void RC5::enc(const byte in[], byte out[]) const +void RC5::encrypt_n(const byte in[], byte out[], u32bit blocks) const { - u32bit A = load_le<u32bit>(in, 0), B = load_le<u32bit>(in, 1); - - A += S[0]; B += S[1]; - for(u32bit j = 0; j != ROUNDS; j += 4) + for(u32bit i = 0; i != blocks; ++i) { - A = rotate_left(A ^ B, B % 32) + S[2*j+2]; - B = rotate_left(B ^ A, A % 32) + S[2*j+3]; - A = rotate_left(A ^ B, B % 32) + S[2*j+4]; - B = rotate_left(B ^ A, A % 32) + S[2*j+5]; - A = rotate_left(A ^ B, B % 32) + S[2*j+6]; - B = rotate_left(B ^ A, A % 32) + S[2*j+7]; - A = rotate_left(A ^ B, B % 32) + S[2*j+8]; - B = rotate_left(B ^ A, A % 32) + S[2*j+9]; - } + u32bit A = load_le<u32bit>(in, 0), B = load_le<u32bit>(in, 1); + + A += S[0]; B += S[1]; + for(u32bit j = 0; j != ROUNDS; j += 4) + { + A = rotate_left(A ^ B, B % 32) + S[2*j+2]; + B = rotate_left(B ^ A, A % 32) + S[2*j+3]; + A = rotate_left(A ^ B, B % 32) + S[2*j+4]; + B = rotate_left(B ^ A, A % 32) + S[2*j+5]; + A = rotate_left(A ^ B, B % 32) + S[2*j+6]; + B = rotate_left(B ^ A, A % 32) + S[2*j+7]; + A = rotate_left(A ^ B, B % 32) + S[2*j+8]; + B = rotate_left(B ^ A, A % 32) + S[2*j+9]; + } - store_le(out, A, B); + store_le(out, A, B); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* * RC5 Decryption */ -void RC5::dec(const byte in[], byte out[]) const +void RC5::decrypt_n(const byte in[], byte out[], u32bit blocks) const { - u32bit A = load_le<u32bit>(in, 0), B = load_le<u32bit>(in, 1); - - for(u32bit j = ROUNDS; j != 0; j -= 4) + for(u32bit i = 0; i != blocks; ++i) { - B = rotate_right(B - S[2*j+1], A % 32) ^ A; - A = rotate_right(A - S[2*j ], B % 32) ^ B; - B = rotate_right(B - S[2*j-1], A % 32) ^ A; - A = rotate_right(A - S[2*j-2], B % 32) ^ B; - B = rotate_right(B - S[2*j-3], A % 32) ^ A; - A = rotate_right(A - S[2*j-4], B % 32) ^ B; - B = rotate_right(B - S[2*j-5], A % 32) ^ A; - A = rotate_right(A - S[2*j-6], B % 32) ^ B; - } - B -= S[1]; A -= S[0]; + u32bit A = load_le<u32bit>(in, 0), B = load_le<u32bit>(in, 1); + + for(u32bit j = ROUNDS; j != 0; j -= 4) + { + B = rotate_right(B - S[2*j+1], A % 32) ^ A; + A = rotate_right(A - S[2*j ], B % 32) ^ B; + B = rotate_right(B - S[2*j-1], A % 32) ^ A; + A = rotate_right(A - S[2*j-2], B % 32) ^ B; + B = rotate_right(B - S[2*j-3], A % 32) ^ A; + A = rotate_right(A - S[2*j-4], B % 32) ^ B; + B = rotate_right(B - S[2*j-5], A % 32) ^ A; + A = rotate_right(A - S[2*j-6], B % 32) ^ B; + } + B -= S[1]; A -= S[0]; - store_le(out, A, B); + store_le(out, A, B); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; + } } /* diff --git a/src/block/rc5/rc5.h b/src/block/rc5/rc5.h index 083224720..82931c1d2 100644 --- a/src/block/rc5/rc5.h +++ b/src/block/rc5/rc5.h @@ -18,13 +18,15 @@ namespace Botan { class BOTAN_DLL RC5 : public BlockCipher { public: - void clear() throw() { S.clear(); } + void encrypt_n(const byte in[], byte out[], u32bit blocks) const; + void decrypt_n(const byte in[], byte out[], u32bit blocks) const; + + void clear() { S.clear(); } std::string name() const; BlockCipher* clone() const { return new RC5(ROUNDS); } + RC5(u32bit); private: - void enc(const byte[], byte[]) const; - void dec(const byte[], byte[]) const; void key_schedule(const byte[], u32bit); SecureVector<u32bit> S; const u32bit ROUNDS; |