/* * aes_icm_ossl.c * * AES Integer Counter Mode * * John A. Foley * Cisco Systems, Inc. * * 2/24/2012: This module was modified to use CiscoSSL for AES counter * mode. Eddy Lem contributed the code to allow this. * * 12/20/2012: Added support for AES-192 and AES-256. */ /* * * Copyright (c) 2013-2017, 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. * */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <openssl/evp.h> #include "aes_icm_ext.h" #include "crypto_types.h" #include "err.h" /* for srtp_debug */ #include "alloc.h" #include "cipher_types.h" srtp_debug_module_t srtp_mod_aes_icm = …; /* * integer counter mode works as follows: * * 16 bits * <-----> * +------+------+------+------+------+------+------+------+ * | nonce | packet index | ctr |---+ * +------+------+------+------+------+------+------+------+ | * | * +------+------+------+------+------+------+------+------+ v * | salt |000000|->(+) * +------+------+------+------+------+------+------+------+ | * | * +---------+ * | encrypt | * +---------+ * | * +------+------+------+------+------+------+------+------+ | * | keystream block |<--+ * +------+------+------+------+------+------+------+------+ * * All fields are big-endian * * ctr is the block counter, which increments from zero for * each packet (16 bits wide) * * packet index is distinct for each packet (48 bits wide) * * nonce can be distinct across many uses of the same key, or * can be a fixed value per key, or can be per-packet randomness * (64 bits) * */ /* * This function allocates a new instance of this crypto engine. * The key_len parameter should be one of 30, 38, or 46 for * AES-128, AES-192, and AES-256 respectively. Note, this key_len * value is inflated, as it also accounts for the 112 bit salt * value. The tlen argument is for the AEAD tag length, which * isn't used in counter mode. */ static srtp_err_status_t srtp_aes_icm_openssl_alloc(srtp_cipher_t **c, int key_len, int tlen) { … } /* * This function deallocates an instance of this engine */ static srtp_err_status_t srtp_aes_icm_openssl_dealloc(srtp_cipher_t *c) { … } /* * aes_icm_openssl_context_init(...) initializes the aes_icm_context * using the value in key[]. * * the key is the secret key * * the salt is unpredictable (but not necessarily secret) data which * randomizes the starting point in the keystream */ static srtp_err_status_t srtp_aes_icm_openssl_context_init(void *cv, const uint8_t *key) { … } /* * aes_icm_set_iv(c, iv) sets the counter value to the exor of iv with * the offset */ static srtp_err_status_t srtp_aes_icm_openssl_set_iv( void *cv, uint8_t *iv, srtp_cipher_direction_t dir) { … } /* * This function encrypts a buffer using AES CTR mode * * Parameters: * c Crypto context * buf data to encrypt * enc_len length of encrypt buffer */ static srtp_err_status_t srtp_aes_icm_openssl_encrypt(void *cv, unsigned char *buf, unsigned int *enc_len) { … } /* * Name of this crypto engine */ static const char srtp_aes_icm_128_openssl_description[] = …; static const char srtp_aes_icm_192_openssl_description[] = …; static const char srtp_aes_icm_256_openssl_description[] = …; /* * KAT values for AES self-test. These * values came from the legacy libsrtp code. */ /* clang-format off */ static const uint8_t srtp_aes_icm_128_test_case_0_key[SRTP_AES_ICM_128_KEY_LEN_WSALT] = …; /* clang-format on */ /* clang-format off */ static uint8_t srtp_aes_icm_128_test_case_0_nonce[16] = …; /* clang-format on */ /* clang-format off */ static const uint8_t srtp_aes_icm_128_test_case_0_plaintext[32] = …; /* clang-format on */ /* clang-format off */ static const uint8_t srtp_aes_icm_128_test_case_0_ciphertext[32] = …; /* clang-format on */ static const srtp_cipher_test_case_t srtp_aes_icm_128_test_case_0 = …; /* * KAT values for AES-192-CTR self-test. These * values came from section 7 of RFC 6188. */ /* clang-format off */ static const uint8_t srtp_aes_icm_192_test_case_0_key[SRTP_AES_ICM_192_KEY_LEN_WSALT] = …; /* clang-format on */ /* clang-format off */ static uint8_t srtp_aes_icm_192_test_case_0_nonce[16] = …; /* clang-format on */ /* clang-format off */ static const uint8_t srtp_aes_icm_192_test_case_0_plaintext[32] = …; /* clang-format on */ /* clang-format off */ static const uint8_t srtp_aes_icm_192_test_case_0_ciphertext[32] = …; /* clang-format on */ static const srtp_cipher_test_case_t srtp_aes_icm_192_test_case_0 = …; /* * KAT values for AES-256-CTR self-test. These * values came from section 7 of RFC 6188. */ /* clang-format off */ static const uint8_t srtp_aes_icm_256_test_case_0_key[SRTP_AES_ICM_256_KEY_LEN_WSALT] = …; /* clang-format on */ /* clang-format off */ static uint8_t srtp_aes_icm_256_test_case_0_nonce[16] = …; /* clang-format on */ /* clang-format off */ static const uint8_t srtp_aes_icm_256_test_case_0_plaintext[32] = …; /* clang-format on */ /* clang-format off */ static const uint8_t srtp_aes_icm_256_test_case_0_ciphertext[32] = …; /* clang-format on */ static const srtp_cipher_test_case_t srtp_aes_icm_256_test_case_0 = …; /* * This is the function table for this crypto engine. * note: the encrypt function is identical to the decrypt function */ const srtp_cipher_type_t srtp_aes_icm_128 = …; /* * This is the function table for this crypto engine. * note: the encrypt function is identical to the decrypt function */ const srtp_cipher_type_t srtp_aes_icm_192 = …; /* * This is the function table for this crypto engine. * note: the encrypt function is identical to the decrypt function */ const srtp_cipher_type_t srtp_aes_icm_256 = …;
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