1 files changed, 105 insertions, 0 deletions
diff --git a/src/lib/mac/cbc_mac/cbc_mac.cpp b/src/lib/mac/cbc_mac/cbc_mac.cpp
new file mode 100644
index 000000000..118570e72
--- /dev/null
+++ b/src/lib/mac/cbc_mac/cbc_mac.cpp
@@ -0,0 +1,105 @@
+/*
+* CBC-MAC
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/cbc_mac.h>
+#include <botan/internal/xor_buf.h>
+#include <algorithm>
+
+namespace Botan {
+
+/*
+* Update an CBC-MAC Calculation
+*/
+void CBC_MAC::add_data(const byte input[], size_t length)
+   {
+   size_t xored = std::min(output_length() - position, length);
+   xor_buf(&state[position], input, xored);
+   position += xored;
+
+   if(position < output_length())
+      return;
+
+   e->encrypt(state);
+   input += xored;
+   length -= xored;
+   while(length >= output_length())
+      {
+      xor_buf(state, input, output_length());
+      e->encrypt(state);
+      input += output_length();
+      length -= output_length();
+      }
+
+   xor_buf(state, input, length);
+   position = length;
+   }
+
+/*
+* Finalize an CBC-MAC Calculation
+*/
+void CBC_MAC::final_result(byte mac[])
+   {
+   if(position)
+      e->encrypt(state);
+
+   copy_mem(mac, &state[0], state.size());
+   zeroise(state);
+   position = 0;
+   }
+
+/*
+* CBC-MAC Key Schedule
+*/
+void CBC_MAC::key_schedule(const byte key[], size_t length)
+   {
+   e->set_key(key, length);
+   }
+
+/*
+* Clear memory of sensitive data
+*/
+void CBC_MAC::clear()
+   {
+   e->clear();
+   zeroise(state);
+   position = 0;
+   }
+
+/*
+* Return the name of this type
+*/
+std::string CBC_MAC::name() const
+   {
+   return "CBC-MAC(" + e->name() + ")";
+   }
+
+/*
+* Return a clone of this object
+*/
+MessageAuthenticationCode* CBC_MAC::clone() const
+   {
+   return new CBC_MAC(e->clone());
+   }
+
+/*
+* CBC-MAC Constructor
+*/
+CBC_MAC::CBC_MAC(BlockCipher* e_in) :
+   e(e_in), state(e->block_size())
+   {
+   position = 0;
+   }
+
+/*
+* CBC-MAC Destructor
+*/
+CBC_MAC::~CBC_MAC()
+   {
+   delete e;
+   }
+
+}