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

概述

设置 kdf-SCRYPT算法的参数, 取key

笔记

/*!
\file scrypt.c
\note openssl3.2 - 官方demo学习 - kdf - scrypt.c
设置 kdf-SCRYPT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 scrypt_salt[] = {'N', 'a', 'C', 'l'
};/** The SCRYPT parameters 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 scrypt_n = 1024;
static unsigned int scrypt_r = 8;
static unsigned int scrypt_p = 16;static const unsigned char expected_output[] = {0xfd, 0xba, 0xbe, 0x1c, 0x9d, 0x34, 0x72, 0x00,0x78, 0x56, 0xe7, 0x19, 0x0d, 0x01, 0xe9, 0xfe,0x7c, 0x6a, 0xd7, 0xcb, 0xc8, 0x23, 0x78, 0x30,0xe7, 0x73, 0x76, 0x63, 0x4b, 0x37, 0x31, 0x62,0x2e, 0xaf, 0x30, 0xd9, 0x2e, 0x22, 0xa3, 0x88,0x6f, 0xf1, 0x09, 0x27, 0x9d, 0x98, 0x30, 0xda,0xc7, 0x27, 0xaf, 0xb9, 0x4a, 0x83, 0xee, 0x6d,0x83, 0x60, 0xcb, 0xdf, 0xa2, 0xcc, 0x06, 0x40
};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[64];OSSL_PARAM _ossl_param_ary[6], *p_ossl_param = _ossl_param_ary;OSSL_LIB_CTX *_ossl_lib_ctx = NULL;_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, "SCRYPT", 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 password */*p_ossl_param++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD, password,sizeof(password));/* Set salt */*p_ossl_param++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT, scrypt_salt,sizeof(scrypt_salt));/* Set N (default 1048576) */*p_ossl_param++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_SCRYPT_N, &scrypt_n);/* Set R (default 8) */*p_ossl_param++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_SCRYPT_R, &scrypt_r);/* Set P (default 1) */*p_ossl_param++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_SCRYPT_P, &scrypt_p);*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(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(_evp_kdf_ctx);EVP_KDF_free(_evp_kdf);OSSL_LIB_CTX_free(_ossl_lib_ctx);return ret;
}

END