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diff --git a/src/crypto.h b/src/crypto.h
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+/*
+  Copyright (c) 2012-2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef _FASTD_CRYPTO_H_
+#define _FASTD_CRYPTO_H_
+
+#include "fastd.h"
+
+
+struct fastd_cipher {
+	const char *name;
+	size_t key_length;
+	size_t iv_length;
+
+	fastd_cipher_context_t* (*initialize)(fastd_context_t *ctx);
+	fastd_cipher_state_t* (*init_state)(fastd_context_t *ctx, const fastd_cipher_context_t *cctx, const uint8_t *key);
+
+	bool (*crypt)(fastd_context_t *ctx, const fastd_cipher_state_t *state, fastd_block128_t *out, const fastd_block128_t *in, size_t len, const uint8_t *iv);
+
+	void (*free_state)(fastd_context_t *ctx, fastd_cipher_state_t *state);
+	void (*free)(fastd_context_t *ctx, fastd_cipher_context_t *cctx);
+};
+
+struct fastd_mac {
+	const char *name;
+	size_t key_length;
+
+	fastd_mac_context_t* (*initialize)(fastd_context_t *ctx);
+	fastd_mac_state_t* (*init_state)(fastd_context_t *ctx, const fastd_mac_context_t *mctx, const uint8_t *key);
+
+	bool (*hash)(fastd_context_t *ctx, const fastd_mac_state_t *state, fastd_block128_t *out, const fastd_block128_t *in, size_t n_blocks);
+
+	void (*free_state)(fastd_context_t *ctx, fastd_mac_state_t *state);
+	void (*free)(fastd_context_t *ctx, fastd_mac_context_t *mctx);
+};
+
+#endif /* _FASTD_CRYPTO_H_ */