1 files changed, 129 insertions, 0 deletions
diff --git a/src/lib/block/lubyrack/lubyrack.cpp b/src/lib/block/lubyrack/lubyrack.cpp
new file mode 100644
index 000000000..9be079003
--- /dev/null
+++ b/src/lib/block/lubyrack/lubyrack.cpp
@@ -0,0 +1,129 @@
+/*
+* Luby-Rackoff
+* (C) 1999-2008 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/lubyrack.h>
+#include <botan/internal/xor_buf.h>
+
+namespace Botan {
+
+/*
+* Luby-Rackoff Encryption
+*/
+void LubyRackoff::encrypt_n(const byte in[], byte out[], size_t blocks) const
+   {
+   const size_t len = hash->output_length();
+
+   secure_vector<byte> buffer_vec(len);
+   byte* buffer = &buffer_vec[0];
+
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      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);
+
+      in += 2 * len;
+      out += 2 * len;
+      }
+   }
+
+/*
+* Luby-Rackoff Decryption
+*/
+void LubyRackoff::decrypt_n(const byte in[], byte out[], size_t blocks) const
+   {
+   const size_t len = hash->output_length();
+
+   secure_vector<byte> buffer_vec(len);
+   byte* buffer = &buffer_vec[0];
+
+   for(size_t i = 0; i != blocks; ++i)
+      {
+      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);
+
+      in += 2 * len;
+      out += 2 * len;
+      }
+   }
+
+/*
+* Luby-Rackoff Key Schedule
+*/
+void LubyRackoff::key_schedule(const byte key[], size_t length)
+   {
+   K1.assign(key, key + (length / 2));
+   K2.assign(key + (length / 2), key + length);
+   }
+
+/*
+* Clear memory of sensitive data
+*/
+void LubyRackoff::clear()
+   {
+   zap(K1);
+   zap(K2);
+   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) : hash(h)
+   {
+   }
+
+}