diff options
Diffstat (limited to 'src/block/idea')
| -rw-r--r-- | src/block/idea/idea.cpp | 132 | ||||
| -rw-r--r-- | src/block/idea/idea.h | 8 | ||||
| -rw-r--r-- | src/block/idea/info.txt | 7 |
3 files changed, 77 insertions, 70 deletions
diff --git a/src/block/idea/idea.cpp b/src/block/idea/idea.cpp index 5bbe47087..fb5fe83f1 100644 --- a/src/block/idea/idea.cpp +++ b/src/block/idea/idea.cpp @@ -60,77 +60,89 @@ u16bit mul_inv(u16bit x) /* * IDEA Encryption */ -void IDEA::enc(const byte in[], byte out[]) const +void IDEA::encrypt_n(const byte in[], byte out[], u32bit blocks) const { - u16bit X1 = load_be<u16bit>(in, 0); - u16bit X2 = load_be<u16bit>(in, 1); - u16bit X3 = load_be<u16bit>(in, 2); - u16bit X4 = load_be<u16bit>(in, 3); - - for(u32bit j = 0; j != 8; ++j) + for(u32bit i = 0; i != blocks; ++i) { - X1 = mul(X1, EK[6*j+0]); - X2 += EK[6*j+1]; - X3 += EK[6*j+2]; - X4 = mul(X4, EK[6*j+3]); - - u16bit T0 = X3; - X3 = mul(X3 ^ X1, EK[6*j+4]); - - u16bit T1 = X2; - X2 = mul((X2 ^ X4) + X3, EK[6*j+5]); - X3 += X2; - - X1 ^= X2; - X4 ^= X3; - X2 ^= T0; - X3 ^= T1; + u16bit X1 = load_be<u16bit>(in, 0); + u16bit X2 = load_be<u16bit>(in, 1); + u16bit X3 = load_be<u16bit>(in, 2); + u16bit X4 = load_be<u16bit>(in, 3); + + for(u32bit j = 0; j != 8; ++j) + { + X1 = mul(X1, EK[6*j+0]); + X2 += EK[6*j+1]; + X3 += EK[6*j+2]; + X4 = mul(X4, EK[6*j+3]); + + u16bit T0 = X3; + X3 = mul(X3 ^ X1, EK[6*j+4]); + + u16bit T1 = X2; + X2 = mul((X2 ^ X4) + X3, EK[6*j+5]); + X3 += X2; + + X1 ^= X2; + X4 ^= X3; + X2 ^= T0; + X3 ^= T1; + } + + X1 = mul(X1, EK[48]); + X2 += EK[50]; + X3 += EK[49]; + X4 = mul(X4, EK[51]); + + store_be(out, X1, X3, X2, X4); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; } - - X1 = mul(X1, EK[48]); - X2 += EK[50]; - X3 += EK[49]; - X4 = mul(X4, EK[51]); - - store_be(out, X1, X3, X2, X4); } /* * IDEA Decryption */ -void IDEA::dec(const byte in[], byte out[]) const +void IDEA::decrypt_n(const byte in[], byte out[], u32bit blocks) const { - u16bit X1 = load_be<u16bit>(in, 0); - u16bit X2 = load_be<u16bit>(in, 1); - u16bit X3 = load_be<u16bit>(in, 2); - u16bit X4 = load_be<u16bit>(in, 3); - - for(u32bit j = 0; j != 8; ++j) + for(u32bit i = 0; i != blocks; ++i) { - X1 = mul(X1, DK[6*j+0]); - X2 += DK[6*j+1]; - X3 += DK[6*j+2]; - X4 = mul(X4, DK[6*j+3]); - - u16bit T0 = X3; - X3 = mul(X3 ^ X1, DK[6*j+4]); - - u16bit T1 = X2; - X2 = mul((X2 ^ X4) + X3, DK[6*j+5]); - X3 += X2; - - X1 ^= X2; - X4 ^= X3; - X2 ^= T0; - X3 ^= T1; + u16bit X1 = load_be<u16bit>(in, 0); + u16bit X2 = load_be<u16bit>(in, 1); + u16bit X3 = load_be<u16bit>(in, 2); + u16bit X4 = load_be<u16bit>(in, 3); + + for(u32bit j = 0; j != 8; ++j) + { + X1 = mul(X1, DK[6*j+0]); + X2 += DK[6*j+1]; + X3 += DK[6*j+2]; + X4 = mul(X4, DK[6*j+3]); + + u16bit T0 = X3; + X3 = mul(X3 ^ X1, DK[6*j+4]); + + u16bit T1 = X2; + X2 = mul((X2 ^ X4) + X3, DK[6*j+5]); + X3 += X2; + + X1 ^= X2; + X4 ^= X3; + X2 ^= T0; + X3 ^= T1; + } + + X1 = mul(X1, DK[48]); + X2 += DK[50]; + X3 += DK[49]; + X4 = mul(X4, DK[51]); + + store_be(out, X1, X3, X2, X4); + + in += BLOCK_SIZE; + out += BLOCK_SIZE; } - - X1 = mul(X1, DK[48]); - X2 += DK[50]; - X3 += DK[49]; - X4 = mul(X4, DK[51]); - - store_be(out, X1, X3, X2, X4); } /* diff --git a/src/block/idea/idea.h b/src/block/idea/idea.h index 2c53cd0e4..c1a79f423 100644 --- a/src/block/idea/idea.h +++ b/src/block/idea/idea.h @@ -18,13 +18,15 @@ namespace Botan { class BOTAN_DLL IDEA : public BlockCipher { public: - void clear() throw() { EK.clear(); DK.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() { EK.clear(); DK.clear(); } std::string name() const { return "IDEA"; } BlockCipher* clone() const { return new IDEA; } + IDEA() : BlockCipher(8, 16) {} private: - void enc(const byte[], byte[]) const; - void dec(const byte[], byte[]) const; void key_schedule(const byte[], u32bit); SecureBuffer<u16bit, 52> EK, DK; }; diff --git a/src/block/idea/info.txt b/src/block/idea/info.txt index 2da3ffb43..f11b3d224 100644 --- a/src/block/idea/info.txt +++ b/src/block/idea/info.txt @@ -1,10 +1,3 @@ realname "IDEA" define IDEA - -load_on auto - -<add> -idea.cpp -idea.h -</add> |