1 files changed, 84 insertions, 0 deletions
diff --git a/src/lib/mac/gmac/gmac.h b/src/lib/mac/gmac/gmac.h
new file mode 100644
index 000000000..b05c5451f
--- /dev/null
+++ b/src/lib/mac/gmac/gmac.h
@@ -0,0 +1,84 @@
+/*
+ * GMAC
+ * (C) 2016 Matthias Gierlings, René Korthaus
+ *
+ * Botan is released under the Simplified BSD License (see license.txt)
+ */
+
+#ifndef BOTAN_GMAC_H__
+#define BOTAN_GMAC_H__
+
+#include <botan/gcm.h>
+#include <botan/mac.h>
+#include <botan/types.h>
+#include <algorithm>
+
+namespace Botan {
+
+/**
+* GMAC
+*/
+class BOTAN_DLL GMAC : public MessageAuthenticationCode,
+                       public GHASH
+
+   {
+   public:
+      void clear() override;
+      std::string name() const override;
+      size_t output_length() const override;
+      MessageAuthenticationCode* clone() const override;
+
+      /**
+      * Must be called to set the initialization vector prior to GMAC
+      * calculation.
+      *
+      * @param nonce Initialization vector.
+      * @param nonce_len size of initialization vector.
+      */
+      void start(const byte nonce[], size_t nonce_len);
+
+      /**
+      * Must be called to set the initialization vector prior to GMAC
+      * calculation.
+      *
+      * @param nonce Initialization vector.
+      */
+      void start(const secure_vector<byte>& nonce);
+
+      /**
+      * Must be called to set the initialization vector prior to GMAC
+      * calculation.
+      *
+      * @param nonce Initialization vector.
+      */
+      void start(const std::vector<byte>& nonce);
+
+      Key_Length_Specification key_spec() const override
+         {
+         return m_cipher->key_spec();
+         }
+
+      /**
+      * Creates a new GMAC instance.
+      *
+      * @param cipher the underlying block cipher to use
+      */
+      explicit GMAC(BlockCipher* cipher);
+
+      GMAC(const GMAC&) = delete;
+      GMAC& operator=(const GMAC&) = delete;
+
+   private:
+      void add_data(const byte[], size_t) override;
+      void final_result(byte[]) override;
+      void start_msg(const byte nonce[], size_t nonce_len) override;
+      void key_schedule(const byte key[], size_t size) override;
+
+      static const size_t GCM_BS = 16;
+      secure_vector<byte> m_aad_buf;
+      std::unique_ptr<BlockCipher> m_cipher;
+      bool m_initialized;
+   };
+
+}
+#endif