/*
  Copyright (c) 2012-2014, 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.
*/


#include <src/crypto.h>
#include <src/fastd.h>


@CIPHER_DEFINITIONS@

typedef struct fastd_cipher_impl {
	const char *name;
	const fastd_cipher_t *impl;
} fastd_cipher_impl_t;

typedef struct cipher_entry {
	const char *name;
	const fastd_cipher_info_t *info;
	const fastd_cipher_impl_t *impls;
} cipher_entry_t;

@CIPHER_IMPLS@

static const cipher_entry_t ciphers[] = { @CIPHER_LIST@
};

static const fastd_cipher_t *cipher_conf[array_size(ciphers)] = {};


static inline bool cipher_available(const fastd_cipher_t *cipher) {
	return (!cipher->available) || cipher->available();
}

/** Initializes the list of ciphers */
void fastd_cipher_init(void) {
	size_t i, j;
	for (i = 0; i < array_size(ciphers); i++) {
		for (j = 0; ciphers[i].impls[j].impl; j++) {
			if (cipher_available(ciphers[i].impls[j].impl))
				break;
		}

		cipher_conf[i] = ciphers[i].impls[j].impl;
	}
}

/** Configures a cipher to use a specific implementation */
bool fastd_cipher_config(const char *name, const char *impl) {
	size_t i;
	for (i = 0; i < array_size(ciphers); i++) {
		if (!strcmp(ciphers[i].name, name)) {
			size_t j;
			for (j = 0; ciphers[i].impls[j].impl; j++) {
				if (!strcmp(ciphers[i].impls[j].name, impl)) {
					if (!cipher_available(ciphers[i].impls[j].impl))
						return false;

					cipher_conf[i] = ciphers[i].impls[j].impl;
					return true;
				}
			}

			return false;
		}
	}

	return false;
}

const fastd_cipher_info_t* fastd_cipher_info_get_by_name(const char *name) {
	size_t i;
	for (i = 0; i < array_size(ciphers); i++) {
		if (strcmp(ciphers[i].name, name))
			continue;

		if (cipher_conf[i])
			return ciphers[i].info;

		break;
	}

	return NULL;
}

const fastd_cipher_t* fastd_cipher_get(const fastd_cipher_info_t *info) {
	size_t i;
	for (i = 0; i < array_size(ciphers); i++) {
		if (ciphers[i].info == info)
			return cipher_conf[i];
	}

	return NULL;
}