/*
 * aes_icm.h
 *
 * Header for AES Integer Counter Mode.
 *
 * David A. McGrew
 * Cisco Systems, Inc.
 *
 */
/*
 *
 * Copyright (c) 2001-2005,2012, Cisco Systems, Inc.
 * 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 the Cisco Systems, Inc. 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 HOLDERS 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 AES_ICM_H
#define AES_ICM_H

#include "cipher.h"
#include <openssl/evp.h>
#include <openssl/aes.h>

#ifdef OPENSSL_IS_BORINGSSL
// BoringSSL doesn't support AES-192, cipher will be disabled
#define SRTP_NO_AES192
#endif

#define     SALT_SIZE               14
#define     AES_128_KEYSIZE         AES_BLOCK_SIZE
#ifndef SRTP_NO_AES192
#define     AES_192_KEYSIZE         AES_BLOCK_SIZE + AES_BLOCK_SIZE / 2
#endif
#define     AES_256_KEYSIZE         AES_BLOCK_SIZE * 2
#define     AES_128_KEYSIZE_WSALT   AES_128_KEYSIZE + SALT_SIZE
#ifndef SRTP_NO_AES192
#define     AES_192_KEYSIZE_WSALT   AES_192_KEYSIZE + SALT_SIZE
#endif
#define     AES_256_KEYSIZE_WSALT   AES_256_KEYSIZE + SALT_SIZE

typedef struct {
    v128_t counter;                /* holds the counter value          */
    v128_t offset;                 /* initial offset value             */
    v256_t key;
    int key_size;
    EVP_CIPHER_CTX* ctx;
} aes_icm_ctx_t;

err_status_t aes_icm_openssl_set_iv(aes_icm_ctx_t *c, void *iv, int dir);
err_status_t aes_icm_openssl_context_init(aes_icm_ctx_t *c, const uint8_t *key, int len);
err_status_t aes_icm_output(aes_icm_ctx_t *c, uint8_t *buffer, int num_octets_to_output);
uint16_t aes_icm_bytes_encrypted(aes_icm_ctx_t *c);


#endif /* AES_ICM_H */

