苏州哪个公司做门户网站,支付宝小程序开发工具,app推广方法及技巧,手机网站 空间文章目录 openssl3.2 - 官方demo学习 - mac - siphash.c概述笔记END openssl3.2 - 官方demo学习 - mac - siphash.c
概述
MAC算法为 SIPHASH, 设置参数(C-rounds, D-rounds, 也可以不设置, 有默认值) 用key初始化MAC算法, 算明文的MAC值
笔记
/*!
\file siphash.c
\note
op… 文章目录 openssl3.2 - 官方demo学习 - mac - siphash.c概述笔记END openssl3.2 - 官方demo学习 - mac - siphash.c
概述
MAC算法为 SIPHASH, 设置参数(C-rounds, D-rounds, 也可以不设置, 有默认值) 用key初始化MAC算法, 算明文的MAC值
笔记
/*!
\file siphash.c
\note
openssl3.2 - 官方demo学习 - mac - siphash.c
MAC算法为 SIPHASH, 设置参数(C-rounds, D-rounds, 也可以不设置, 有默认值)
用key初始化MAC算法, 算明文的MAC值
*//** 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 the test vector from the paper SipHash: a fast short-input PRF.* https://www.aumasson.jp/siphash/siphash.pdf*//** Hard coding the key into an application is very bad.* It is done here solely for educational purposes.*/
static unsigned char key[] {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
};static unsigned char data[] {0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e
};static const unsigned char expected_output[] {0xe5, 0x45, 0xbe, 0x49, 0x61, 0xca, 0x29, 0xa1
};/** A property query used for selecting the SIPHASH implementation.*/
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[8];OSSL_PARAM params[4], * p params;OSSL_LIB_CTX* _ossl_lib_ctx NULL;unsigned int digest_len 8, c_rounds 2, d_rounds 4;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 SipHash implementation */_evp_mac EVP_MAC_fetch(_ossl_lib_ctx, SIPHASH, propq);if (_evp_mac NULL) {fprintf(stderr, EVP_MAC_fetch() returned NULL\n);goto end;}/* Create a context for the SipHash 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;}/* SipHash can support either 8 or 16-byte digests. */*p OSSL_PARAM_construct_uint(OSSL_MAC_PARAM_SIZE, digest_len);/** The number of C-rounds and D-rounds is configurable. Standard SipHash* uses values of 2 and 4 respectively. The following lines are unnecessary* as they set the default, but demonstrate how to change these values.*/*p OSSL_PARAM_construct_uint(OSSL_MAC_PARAM_C_ROUNDS, c_rounds);*p OSSL_PARAM_construct_uint(OSSL_MAC_PARAM_D_ROUNDS, d_rounds);*p OSSL_PARAM_construct_end();/* Initialise the SIPHASH operation */if (!EVP_MAC_init(_evp_mac_ctx, key, sizeof(key), params)) {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;
}
END
