Nicely encapsulate different crypto algorithm implementations

1 files changed, 77 insertions, 0 deletions

diff --git a/src/crypto.h b/src/crypto.h
new file mode 100644
index 0000000..89c44d6
--- /dev/null
+++ b/src/crypto.h
@@ -0,0 +1,77 @@
+/*
+  Copyright (c) 2012, 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 "types.h"
+
+#include <stdint.h>
+
+
+typedef union _fastd_block128 {
+	uint8_t b[16];
+	uint64_t qw[2];
+} __attribute__((aligned(16))) fastd_block128;
+
+
+#ifdef USE_CRYPTO_AES128CTR
+struct _fastd_crypto_aes128ctr {
+	const char *name;
+
+	fastd_crypto_aes128ctr_context* (*init)(fastd_context *ctx);
+	fastd_crypto_aes128ctr_state* (*set_key)(fastd_context *ctx, const fastd_crypto_aes128ctr_context *cctx, const fastd_block128 *key);
+	bool (*crypt)(fastd_context *ctx, const fastd_crypto_aes128ctr_state *cstate, fastd_block128 *out, const fastd_block128 *in, size_t len, const fastd_block128 *iv);
+
+	void (*free_state)(fastd_context *ctx, fastd_crypto_aes128ctr_state *cstate);
+	void (*free)(fastd_context *ctx, fastd_crypto_aes128ctr_context *cctx);
+};
+#endif
+
+#ifdef USE_CRYPTO_GHASH
+struct _fastd_crypto_ghash {
+	const char *name;
+
+	fastd_crypto_ghash_context* (*init)(fastd_context *ctx);
+	fastd_crypto_ghash_state* (*set_h)(fastd_context *ctx, const fastd_crypto_ghash_context *cctx, const fastd_block128 *h);
+	bool (*hash)(fastd_context *ctx, const fastd_crypto_ghash_state *cstate, fastd_block128 *out, const fastd_block128 *in, size_t n_blocks);
+
+	void (*free_state)(fastd_context *ctx, fastd_crypto_ghash_state *cstate);
+	void (*free)(fastd_context *ctx, fastd_crypto_ghash_context *cctx);
+};
+#endif
+
+
+static inline void xor(fastd_block128 *x, const fastd_block128 *a, const fastd_block128 *b) {
+	x->qw[0] = a->qw[0] ^ b->qw[0];
+	x->qw[1] = a->qw[1] ^ b->qw[1];
+}
+
+static inline void xor_a(fastd_block128 *x, const fastd_block128 *a) {
+	xor(x, x, a);
+}
+
+#endif /* _FASTD_CRYPTO_H_ */