openssl3.2 - 官方demo学习 - kdf - pbkdf2.c

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openssl3.2 - 官方demo学习 - kdf - pbkdf2.c

概述

设置PBKDF2算法的参数, 取key

笔记

/*!
\file pbkdf2.c
\note 
openssl3.2 - 官方demo学习 - kdf - pbkdf2.c
设置PBKDF2算法的参数, 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 <openssl/core_names.h>
#include <openssl/crypto.h>
#include <openssl/kdf.h>
#include <openssl/obj_mac.h>
#include <openssl/params.h>#include "my_openSSL_lib.h"/** test vector from* https://datatracker.ietf.org/doc/html/rfc7914*//** Hard coding a password into an application is very bad.* It is done here solely for educational purposes.*/
static unsigned char password[] = {'P', 'a', 's', 's', 'w', 'o', 'r', 'd'
};/** The salt is better not being hard coded too.  Each password should have a* different salt if possible.  The salt is not considered secret information* and is safe to store with an encrypted password.*/
static unsigned char pbkdf2_salt[] = {'N', 'a', 'C', 'l'
};/** The iteration parameter can be variable or hard coded.  The disadvantage with* hard coding them is that they cannot easily be adjusted for future* technological improvements appear.*/
static unsigned int pbkdf2_iterations = 80000;static const unsigned char expected_output[] = {0x4d, 0xdc, 0xd8, 0xf6, 0x0b, 0x98, 0xbe, 0x21,0x83, 0x0c, 0xee, 0x5e, 0xf2, 0x27, 0x01, 0xf9,0x64, 0x1a, 0x44, 0x18, 0xd0, 0x4c, 0x04, 0x14,0xae, 0xff, 0x08, 0x87, 0x6b, 0x34, 0xab, 0x56,0xa1, 0xd4, 0x25, 0xa1, 0x22, 0x58, 0x33, 0x54,0x9a, 0xdb, 0x84, 0x1b, 0x51, 0xc9, 0xb3, 0x17,0x6a, 0x27, 0x2b, 0xde, 0xbb, 0xa1, 0xd0, 0x78,0x47, 0x8f, 0x62, 0xb3, 0x97, 0xf3, 0x3c, 0x8d
};int main(int argc, char **argv)
{int ret = EXIT_FAILURE;EVP_KDF *kdf = NULL;EVP_KDF_CTX *kctx = NULL;unsigned char out[64];OSSL_PARAM params[5], *p = params;OSSL_LIB_CTX *library_context = NULL;library_context = OSSL_LIB_CTX_new();if (library_context == NULL) {fprintf(stderr, "OSSL_LIB_CTX_new() returned NULL\n");goto end;}/* Fetch the key derivation function implementation */kdf = EVP_KDF_fetch(library_context, "PBKDF2", NULL);if (kdf == NULL) {fprintf(stderr, "EVP_KDF_fetch() returned NULL\n");goto end;}/* Create a context for the key derivation operation */kctx = EVP_KDF_CTX_new(kdf);if (kctx == NULL) {fprintf(stderr, "EVP_KDF_CTX_new() returned NULL\n");goto end;}/* Set password */*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD, password,sizeof(password));/* Set salt */*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, pbkdf2_salt,sizeof(pbkdf2_salt));/* Set iteration count (default 2048) */*p++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_ITER, &pbkdf2_iterations);/* Set the underlying hash function used to derive the key */*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,"SHA256", 0);*p = OSSL_PARAM_construct_end();/* Derive the key */if (EVP_KDF_derive(kctx, out, sizeof(out), params) != 1) {fprintf(stderr, "EVP_KDF_derive() failed\n");goto end;}if (CRYPTO_memcmp(expected_output, out, sizeof(expected_output)) != 0) {fprintf(stderr, "Generated key does not match expected value\n");goto end;}ret = EXIT_SUCCESS;
end:EVP_KDF_CTX_free(kctx);EVP_KDF_free(kdf);OSSL_LIB_CTX_free(library_context);return ret;
}

END

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