1 files changed, 64 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/lib/mac/gmac/gmac.h b/comm/third_party/botan/src/lib/mac/gmac/gmac.h
new file mode 100644
index 0000000000..b78aeec6f1
--- /dev/null
+++ b/comm/third_party/botan/src/lib/mac/gmac/gmac.h
@@ -0,0 +1,64 @@
+/*
+ * GMAC
+ * (C) 2016 Matthias Gierlings, René Korthaus
+ * (C) 2017 Jack Lloyd
+ *
+ * Botan is released under the Simplified BSD License (see license.txt)
+ */
+
+#ifndef BOTAN_GMAC_H_
+#define BOTAN_GMAC_H_
+
+#include <botan/mac.h>
+
+BOTAN_FUTURE_INTERNAL_HEADER(gmac.h)
+
+namespace Botan {
+
+class BlockCipher;
+class GHASH;
+
+/**
+* GMAC
+*
+* GMAC requires a unique initialization vector be used for each message.
+* This must be provided via the MessageAuthenticationCode::start() API
+*/
+class BOTAN_PUBLIC_API(2,0) GMAC final : public MessageAuthenticationCode
+   {
+   public:
+      void clear() override;
+      std::string name() const override;
+      size_t output_length() const override;
+      MessageAuthenticationCode* clone() const override;
+
+      Key_Length_Specification key_spec() const override;
+
+      /**
+      * 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;
+
+      ~GMAC();
+
+   private:
+      void add_data(const uint8_t[], size_t) override;
+      void final_result(uint8_t[]) override;
+      void start_msg(const uint8_t nonce[], size_t nonce_len) override;
+      void key_schedule(const uint8_t key[], size_t size) override;
+
+      static const size_t GCM_BS = 16;
+      std::unique_ptr<BlockCipher> m_cipher;
+      std::unique_ptr<GHASH> m_ghash;
+      secure_vector<uint8_t> m_aad_buf;
+      size_t m_aad_buf_pos;
+      bool m_initialized;
+   };
+
+}
+#endif