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)
+   {
+   }
+
+}