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概述
使用GMAC算法, 设置参数(指定加密算法 e.g. AES-128-GCM, 设置iv) 用key执行初始化, 然后对明文生成MAC数据 官方注释给出建议, key, iv最好不要硬编码出现在程… 文章目录 openssl3.2 - 官方demo学习 - mac - gmac.c概述笔记END openssl3.2 - 官方demo学习 - mac - gmac.c
概述
使用GMAC算法, 设置参数(指定加密算法 e.g. AES-128-GCM, 设置iv) 用key执行初始化, 然后对明文生成MAC数据 官方注释给出建议, key, iv最好不要硬编码出现在程序中
笔记
/*!
\file gmac.c
\note openssl3.2 - 官方demo学习 - mac - gmac.c
使用GMAC算法, 设置参数(指定加密算法 e.g. AES-128-GCM, 设置iv)
用key执行初始化, 然后对明文生成MAC数据
*//** Copyright 2021-2023 The OpenSSL Project Authors. All Rights Reserved.** Licensed under the Apache License 2.0 (the License). You may not use* this file except in compliance with the License. You can obtain a copy* in the file LICENSE in the source distribution or at* https://www.openssl.org/source/license.html*/#include stdio.h
#include stdlib.h
#include openssl/core_names.h
#include openssl/evp.h
#include openssl/params.h
#include openssl/err.h#include my_openSSL_lib.h/** Taken from NISTs GCM Test Vectors* http://csrc.nist.gov/groups/STM/cavp/*//** Hard coding the key into an application is very bad.* It is done here solely for educational purposes.*/
static unsigned char key[] {0x77, 0xbe, 0x63, 0x70, 0x89, 0x71, 0xc4, 0xe2,0x40, 0xd1, 0xcb, 0x79, 0xe8, 0xd7, 0x7f, 0xeb
};/** The initialisation vector (IV) is better not being hard coded too.* Repeating password/IV pairs compromises the integrity of GMAC.* The IV is not considered secret information and is safe to store with* an encrypted password.*/
static unsigned char iv[] {0xe0, 0xe0, 0x0f, 0x19, 0xfe, 0xd7, 0xba,0x01, 0x36, 0xa7, 0x97, 0xf3
};static unsigned char data[] {0x7a, 0x43, 0xec, 0x1d, 0x9c, 0x0a, 0x5a, 0x78,0xa0, 0xb1, 0x65, 0x33, 0xa6, 0x21, 0x3c, 0xab
};static const unsigned char expected_output[] {0x20, 0x9f, 0xcc, 0x8d, 0x36, 0x75, 0xed, 0x93,0x8e, 0x9c, 0x71, 0x66, 0x70, 0x9d, 0xd9, 0x46
};/** A property query used for selecting the GMAC implementation and the* underlying GCM mode cipher.*/
static char* propq NULL;int main(int argc, char** argv)
{int ret EXIT_FAILURE;EVP_MAC* _evp_mac NULL;EVP_MAC_CTX* _evp_mac_ctx NULL;unsigned char out[16];OSSL_PARAM _ossl_param_ary[4], * p_ossl_param _ossl_param_ary;OSSL_LIB_CTX* _ossl_lib_ctx NULL;size_t out_len 0;_ossl_lib_ctx OSSL_LIB_CTX_new();if (_ossl_lib_ctx NULL) {fprintf(stderr, OSSL_LIB_CTX_new() returned NULL\n);goto end;}/* Fetch the GMAC implementation */_evp_mac EVP_MAC_fetch(_ossl_lib_ctx, GMAC, propq);if (_evp_mac NULL) {fprintf(stderr, EVP_MAC_fetch() returned NULL\n);goto end;}/* Create a context for the GMAC operation */_evp_mac_ctx EVP_MAC_CTX_new(_evp_mac);if (_evp_mac_ctx NULL) {fprintf(stderr, EVP_MAC_CTX_new() returned NULL\n);goto end;}/* GMAC requires a GCM mode cipher to be specified */*p_ossl_param OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_CIPHER,AES-128-GCM, 0);/** If a non-default property query is required when fetching the GCM mode* cipher, it needs to be specified too.*/if (propq ! NULL)*p_ossl_param OSSL_PARAM_construct_utf8_string(OSSL_MAC_PARAM_PROPERTIES,propq, 0);/* Set the initialisation vector (IV) */*p_ossl_param OSSL_PARAM_construct_octet_string(OSSL_CIPHER_PARAM_IV,iv, sizeof(iv));*p_ossl_param OSSL_PARAM_construct_end();/* Initialise the GMAC operation */if (!EVP_MAC_init(_evp_mac_ctx, key, sizeof(key), _ossl_param_ary)) {fprintf(stderr, EVP_MAC_init() failed\n);goto end;}/* Make one or more calls to process the data to be authenticated */if (!EVP_MAC_update(_evp_mac_ctx, data, sizeof(data))) {fprintf(stderr, EVP_MAC_update() failed\n);goto end;}/* Make one call to the final to get the MAC */if (!EVP_MAC_final(_evp_mac_ctx, out, out_len, sizeof(out))) {fprintf(stderr, EVP_MAC_final() failed\n);goto end;}printf(Generated MAC:\n);BIO_dump_indent_fp(stdout, out, (int)out_len, 2);putchar(\n);if (out_len ! sizeof(expected_output)) {fprintf(stderr, Generated MAC has an unexpected length\n);goto end;}if (CRYPTO_memcmp(expected_output, out, sizeof(expected_output)) ! 0) {fprintf(stderr, Generated MAC does not match expected value\n);goto end;}ret EXIT_SUCCESS;
end:EVP_MAC_CTX_free(_evp_mac_ctx);EVP_MAC_free(_evp_mac);OSSL_LIB_CTX_free(_ossl_lib_ctx);if (ret ! EXIT_SUCCESS)ERR_print_errors_fp(stderr);return ret;
}
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