openssl3.2 - 官方demo学习 - kdf - hkdf.c

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

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