openssl3.2 - 官方demo学习 - kdf - hkdf.c
概述
设置摘要算法HKDF的参数, 然后取key文章来源地址https://www.toymoban.com/news/detail-799301.html
笔记
/*!
\file hkdf.c
\note
openssl3.2 - 官方demo学习 - kdf - hkdf.c
设置摘要算法HKDF的参数, 然后取key
*/
/*
* 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 <stdbool.h>
#include <openssl/core_names.h>
#include <openssl/crypto.h>
#include <openssl/kdf.h>
#include <openssl/obj_mac.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include "my_openSSL_lib.h"
/*
* test vector from
* https://datatracker.ietf.org/doc/html/rfc5869
*/
static unsigned char hkdf_salt[] = {
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
0x0c
};
static unsigned char hkdf_ikm[] = {
0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b
};
static unsigned char hkdf_info[] = {
0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9
};
/* Expected output keying material */
static unsigned char hkdf_okm[] = {
0x3c, 0xb2, 0x5f, 0x25, 0xfa, 0xac, 0xd5, 0x7a, 0x90, 0x43, 0x4f, 0x64,
0xd0, 0x36, 0x2f, 0x2a, 0x2d, 0x2d, 0x0a, 0x90, 0xcf, 0x1a, 0x5a, 0x4c,
0x5d, 0xb0, 0x2d, 0x56, 0xec, 0xc4, 0xc5, 0xbf, 0x34, 0x00, 0x72, 0x08,
0xd5, 0xb8, 0x87, 0x18, 0x58, 0x65
};
int test_EVP_MD_name(void);
int main(int argc, char** argv)
{
int ret = EXIT_FAILURE;
EVP_KDF* _evp_kdf = NULL;
EVP_KDF_CTX* _evp_kdf_ctx = NULL;
unsigned char out[42];
OSSL_PARAM _ossl_param_ary[5], * p_ossl_param = _ossl_param_ary;
OSSL_LIB_CTX* _ossl_lib_ctx = NULL;
// test_EVP_MD_name(); // 想看看摘要算法名称的有效列表
_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 key derivation function implementation */
_evp_kdf = EVP_KDF_fetch(_ossl_lib_ctx, "HKDF", NULL);
if (_evp_kdf == NULL) {
fprintf(stderr, "EVP_KDF_fetch() returned NULL\n");
goto end;
}
/* Create a context for the key derivation operation */
_evp_kdf_ctx = EVP_KDF_CTX_new(_evp_kdf);
if (_evp_kdf_ctx == NULL) {
fprintf(stderr, "EVP_KDF_CTX_new() returned NULL\n");
goto end;
}
/* Set the underlying hash function used to derive the key */
*p_ossl_param++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
"SHA256", 0);
/* Set input keying material */
*p_ossl_param++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_KEY, hkdf_ikm,
sizeof(hkdf_ikm));
/* Set application specific information */
*p_ossl_param++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_INFO, hkdf_info,
sizeof(hkdf_info));
/* Set salt */
*p_ossl_param++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, hkdf_salt,
sizeof(hkdf_salt));
*p_ossl_param = OSSL_PARAM_construct_end();
/* Derive the key */
if (EVP_KDF_derive(_evp_kdf_ctx, out, sizeof(out), _ossl_param_ary) != 1) {
fprintf(stderr, "EVP_KDF_derive() failed\n");
goto end;
}
if (CRYPTO_memcmp(hkdf_okm, out, sizeof(hkdf_okm)) != 0) {
fprintf(stderr, "Generated key does not match expected value\n");
goto end;
}
ret = EXIT_SUCCESS;
end:
EVP_KDF_CTX_free(_evp_kdf_ctx);
EVP_KDF_free(_evp_kdf);
OSSL_LIB_CTX_free(_ossl_lib_ctx);
return ret;
}
int test_EVP_MD_name(void)
{
OSSL_LIB_CTX* ctx;
EVP_MD* md = NULL;
int res = 0;
do {
ctx = OSSL_LIB_CTX_new();
if (NULL == ctx) {
break;
}
md = EVP_MD_fetch(ctx, "whirlpool", NULL);
res = 1;
} while (false);
if (NULL != md)
{
EVP_MD_free(md);
}
if (NULL != ctx)
{
OSSL_LIB_CTX_free(ctx);
}
return res;
}
END
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