/*
 * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 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.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * 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 __CRYPTO_MOD_H__
#define __CRYPTO_MOD_H__

/* Return values */
enum crypto_ret_value {
	CRYPTO_SUCCESS = 0,
	CRYPTO_ERR_INIT,
	CRYPTO_ERR_HASH,
	CRYPTO_ERR_SIGNATURE,
	CRYPTO_ERR_UNKNOWN
};

/*
 * Cryptographic library descriptor
 */
typedef struct crypto_lib_desc_s {
	const char *name;

	/* Initialize library. This function is not expected to fail. All errors
	 * must be handled inside the function, asserting or panicing in case of
	 * a non-recoverable error */
	void (*init)(void);

	/* Verify a digital signature. Return one of the
	 * 'enum crypto_ret_value' options */
	int (*verify_signature)(void *data_ptr, unsigned int data_len,
				void *sig_ptr, unsigned int sig_len,
				void *sig_alg, unsigned int sig_alg_len,
				void *pk_ptr, unsigned int pk_len);

	/* Verify a hash. Return one of the 'enum crypto_ret_value' options */
	int (*verify_hash)(void *data_ptr, unsigned int data_len,
			   void *digest_info_ptr, unsigned int digest_info_len);
} crypto_lib_desc_t;

/* Public functions */
void crypto_mod_init(void);
int crypto_mod_verify_signature(void *data_ptr, unsigned int data_len,
				void *sig_ptr, unsigned int sig_len,
				void *sig_alg, unsigned int sig_alg_len,
				void *pk_ptr, unsigned int pk_len);
int crypto_mod_verify_hash(void *data_ptr, unsigned int data_len,
			   void *digest_info_ptr, unsigned int digest_info_len);

/* Macro to register a cryptographic library */
#define REGISTER_CRYPTO_LIB(_name, _init, _verify_signature, _verify_hash) \
	const crypto_lib_desc_t crypto_lib_desc = { \
		.name = _name, \
		.init = _init, \
		.verify_signature = _verify_signature, \
		.verify_hash = _verify_hash \
	}

#endif /* __CRYPTO_MOD_H__ */