aes128-decrypt.c

+/* aes128-decrypt.c
+
+   Decryption function for aes/rijndael block cipher.
+
+   Copyright (C) 2002, 2013 Niels Möller
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+
+   GNU Nettle is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+
+#include "aes-internal.h"
+
+/* For fat builds */
+#if HAVE_NATIVE_aes128_decrypt
+void
+_nettle_aes128_decrypt_c(const struct aes128_ctx *ctx,
+	       size_t length, uint8_t *dst,
+	       const uint8_t *src);
+# define nettle_aes128_decrypt _nettle_aes128_decrypt_c
+#endif
+
+void
+nettle_aes128_decrypt(const struct aes128_ctx *ctx,
+	       size_t length, uint8_t *dst,
+	       const uint8_t *src)
+{
+  assert(!(length % AES_BLOCK_SIZE) );
+  _nettle_aes_decrypt(_AES128_ROUNDS, ctx->keys + 4*_AES128_ROUNDS,
+		      &_nettle_aes_decrypt_table, length, dst, src);
+}