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diff --git a/src/modes/aead/aead.h b/src/modes/aead/aead.h
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+++ b/src/modes/aead/aead.h
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+/*
+* Interface for AEAD modes
+* (C) 2013 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_AEAD_MODE_H__
+#define BOTAN_AEAD_MODE_H__
+
+#include <botan/transform.h>
+
+namespace Botan {
+
+/**
+* Interface for AEAD (Authenticated Encryption with Associated Data)
+* modes. These modes provide both encryption and message
+* authentication, and can authenticate additional per-message data
+* which is not included in the ciphertext (for instance a sequence
+* number).
+*/
+class AEAD_Mode : public Transformation
+   {
+   public:
+      /**
+      * Set associated data that is not included in the ciphertext but
+      * that should be authenticated. Must be called after set_key
+      * and before finish.
+      *
+      * Unless reset by another call, the associated data is kept
+      * between messages. Thus, if the AD does not change, calling
+      * once (after set_key) is the optimum.
+      *
+      * @param ad the associated data
+      * @param ad_len length of add in bytes
+      */
+      virtual void set_associated_data(const byte ad[], size_t ad_len) = 0;
+
+      template<typename Alloc>
+      void set_associated_data_vec(const std::vector<byte, Alloc>& ad)
+         {
+         set_associated_data(&ad[0], ad.size());
+         }
+
+      /**
+      * Default AEAD nonce size (a commonly supported value among AEAD
+      * modes, and, large enough that random collisions are unlikely).
+      */
+      size_t default_nonce_size() const override { return 12; }
+   };
+
+/**
+* Get an AEAD mode by name (eg "AES-128/GCM" or "Serpent/EAX")
+*/
+BOTAN_DLL AEAD_Mode* get_aead(const std::string& name, Cipher_Dir direction);
+
+}
+
+#endif