1 files changed, 92 insertions, 0 deletions
diff --git a/src/x919_mac.cpp b/src/x919_mac.cpp
new file mode 100644
index 000000000..8e43a5742
--- /dev/null
+++ b/src/x919_mac.cpp
@@ -0,0 +1,92 @@
+/*************************************************
+* ANSI X9.19 MAC Source File                     *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/x919_mac.h>
+#include <botan/lookup.h>
+#include <botan/bit_ops.h>
+#include <algorithm>
+
+namespace Botan {
+
+/*************************************************
+* Update an ANSI X9.19 MAC Calculation           *
+*************************************************/
+void ANSI_X919_MAC::add_data(const byte input[], u32bit length)
+   {
+   u32bit xored = std::min(8 - position, length);
+   xor_buf(state + position, input, xored);
+   position += xored;
+
+   if(position < 8) return;
+
+   e->encrypt(state);
+   input += xored;
+   length -= xored;
+   while(length >= 8)
+      {
+      xor_buf(state, input, 8);
+      e->encrypt(state);
+      input += 8;
+      length -= 8;
+      }
+
+   xor_buf(state, input, length);
+   position = length;
+   }
+
+/*************************************************
+* Finalize an ANSI X9.19 MAC Calculation         *
+*************************************************/
+void ANSI_X919_MAC::final_result(byte mac[])
+   {
+   if(position)
+      e->encrypt(state);
+   d->decrypt(state, mac);
+   e->encrypt(mac);
+   state.clear();
+   position = 0;
+   }
+
+/*************************************************
+* ANSI X9.19 MAC Key Schedule                    *
+*************************************************/
+void ANSI_X919_MAC::key(const byte key[], u32bit length)
+   {
+   e->set_key(key, 8);
+   if(length == 8) d->set_key(key, 8);
+   else            d->set_key(key + 8, 8);
+   }
+
+/*************************************************
+* Clear memory of sensitive data                 *
+*************************************************/
+void ANSI_X919_MAC::clear() throw()
+   {
+   e->clear();
+   d->clear();
+   state.clear();
+   position = 0;
+   }
+
+/*************************************************
+* ANSI X9.19 MAC Constructor                     *
+*************************************************/
+ANSI_X919_MAC::ANSI_X919_MAC() : MessageAuthenticationCode(8, 8, 16, 8)
+   {
+   e = get_block_cipher("DES");
+   d = get_block_cipher("DES");
+   position = 0;
+   }
+
+/*************************************************
+* ANSI X9.19 MAC Destructor                      *
+*************************************************/
+ANSI_X919_MAC::~ANSI_X919_MAC()
+   {
+   delete e;
+   delete d;
+   }
+
+}