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/*
* 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 */
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