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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/lubyrack/lubyrack.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/lubyrack/lubyrack.cpp')
-rw-r--r-- | botan/src/block/lubyrack/lubyrack.cpp | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/botan/src/block/lubyrack/lubyrack.cpp b/botan/src/block/lubyrack/lubyrack.cpp new file mode 100644 index 0000000..a9d2b1d --- /dev/null +++ b/botan/src/block/lubyrack/lubyrack.cpp @@ -0,0 +1,116 @@ +/* +* Luby-Rackoff +* (C) 1999-2008 Jack Lloyd +* +* Distributed under the terms of the Botan license +*/ + +#include <botan/lubyrack.h> +#include <botan/xor_buf.h> + +namespace Botan { + +/* +* Luby-Rackoff Encryption +*/ +void LubyRackoff::enc(const byte in[], byte out[]) const + { + const u32bit len = hash->OUTPUT_LENGTH; + + SecureVector<byte> buffer(len); + hash->update(K1); + hash->update(in, len); + hash->final(buffer); + xor_buf(out + len, in + len, buffer, len); + + hash->update(K2); + hash->update(out + len, len); + hash->final(buffer); + xor_buf(out, in, buffer, len); + + hash->update(K1); + hash->update(out, len); + hash->final(buffer); + xor_buf(out + len, buffer, len); + + hash->update(K2); + hash->update(out + len, len); + hash->final(buffer); + xor_buf(out, buffer, len); + } + +/* +* Luby-Rackoff Decryption +*/ +void LubyRackoff::dec(const byte in[], byte out[]) const + { + const u32bit len = hash->OUTPUT_LENGTH; + + SecureVector<byte> buffer(len); + hash->update(K2); + hash->update(in + len, len); + hash->final(buffer); + xor_buf(out, in, buffer, len); + + hash->update(K1); + hash->update(out, len); + hash->final(buffer); + xor_buf(out + len, in + len, buffer, len); + + hash->update(K2); + hash->update(out + len, len); + hash->final(buffer); + xor_buf(out, buffer, len); + + hash->update(K1); + hash->update(out, len); + hash->final(buffer); + xor_buf(out + len, buffer, len); + } + +/* +* Luby-Rackoff Key Schedule +*/ +void LubyRackoff::key_schedule(const byte key[], u32bit length) + { + K1.set(key, length / 2); + K2.set(key + length / 2, length / 2); + } + +/* +* Clear memory of sensitive data +*/ +void LubyRackoff::clear() throw() + { + K1.clear(); + K2.clear(); + hash->clear(); + } + +/* +* Return a clone of this object +*/ +BlockCipher* LubyRackoff::clone() const + { + return new LubyRackoff(hash->clone()); + } + +/* +* Return the name of this type +*/ +std::string LubyRackoff::name() const + { + return "Luby-Rackoff(" + hash->name() + ")"; + } + +/* +* Luby-Rackoff Constructor +*/ +LubyRackoff::LubyRackoff(HashFunction* h) : + BlockCipher(2 * (h ? h->OUTPUT_LENGTH: 0), + 2, 32, 2), + hash(h) + { + } + +} |