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author | Keith Isdale <keith.isdale@nokia.com> | 2010-07-26 14:56:53 +1000 |
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committer | Keith Isdale <keith.isdale@nokia.com> | 2010-07-26 14:56:53 +1000 |
commit | 9f034793bcfc51c2b7c1dd14db806f7258f9a9eb (patch) | |
tree | 63bd0f50ce5b77828ad8205eafd7b9412810499e /botan/src/block/xtea/xtea.cpp | |
parent | 619d92cfef29e653bfdf852e83888e50cfc4348f (diff) | |
parent | 65271649dbc90f3af1184ad1b23bdb64c0c07d07 (diff) |
Merge branch 'master' of git://git-nokia.trolltech.com.au/qtsoftware/research/qtuitest
Diffstat (limited to 'botan/src/block/xtea/xtea.cpp')
-rw-r--r-- | botan/src/block/xtea/xtea.cpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/botan/src/block/xtea/xtea.cpp b/botan/src/block/xtea/xtea.cpp new file mode 100644 index 0000000..5047f65 --- /dev/null +++ b/botan/src/block/xtea/xtea.cpp @@ -0,0 +1,64 @@ +/* +* XTEA +* (C) 1999-2009 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/xtea.h> +#include <botan/loadstor.h> +#include <botan/parsing.h> + +namespace Botan { + +/* +* XTEA Encryption +*/ +void XTEA::enc(const byte in[], byte out[]) const + { + 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); + } + +/* +* XTEA Decryption +*/ +void XTEA::dec(const byte in[], byte out[]) const + { + 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); + } + +/* +* XTEA Key Schedule +*/ +void XTEA::key_schedule(const byte key[], u32bit) + { + SecureBuffer<u32bit, 4> UK; + for(u32bit i = 0; i != 4; ++i) + UK[i] = load_be<u32bit>(key, i); + + u32bit D = 0; + for(u32bit i = 0; i != 64; i += 2) + { + EK[i ] = D + UK[D % 4]; + D += 0x9E3779B9; + EK[i+1] = D + UK[(D >> 11) % 4]; + } + } + +} |