| /* |
| * 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 */ |
| |