文章目录
openssl3.2 - 官方demo学习 - kdf - argon2.c
概述
设置KDF算法的参数, 并获得key
笔记
c
/*!
\file argon2.c
\note openssl3.2 - 官方demo学习 - kdf - argon2.c
设置KDF算法的参数, 并获得key
*/
/*
* Copyright 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/params.h>
#include <openssl/thread.h>
#include "my_openSSL_lib.h"
/*
* Example showing how to use Argon2 KDF.
* See man EVP_KDF-ARGON2 for more information.
*
* test vector from
* https://datatracker.ietf.org/doc/html/rfc9106
*/
/*
* Hard coding a password into an application is very bad.
* It is done here solely for educational purposes.
*/
static unsigned char password[] = {
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01
};
/*
* 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 salt[] = {
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,
0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02
};
/*
* Optional secret for KDF
*/
static unsigned char secret[] = {
0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03, 0x03
};
/*
* Optional additional data
*/
static unsigned char ad[] = {
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04
};
/*
* Argon2 cost parameters
*/
static uint32_t memory_cost = 32;
static uint32_t iteration_cost = 3;
static uint32_t parallel_cost = 4;
static const unsigned char expected_output[] = {
0x0d, 0x64, 0x0d, 0xf5, 0x8d, 0x78, 0x76, 0x6c,
0x08, 0xc0, 0x37, 0xa3, 0x4a, 0x8b, 0x53, 0xc9,
0xd0, 0x1e, 0xf0, 0x45, 0x2d, 0x75, 0xb6, 0x5e,
0xb5, 0x25, 0x20, 0xe9, 0x6b, 0x01, 0xe6, 0x59
};
int main(int argc, char **argv)
{
int rv = EXIT_FAILURE;
EVP_KDF *_evp_kdf = NULL;
EVP_KDF_CTX *_evp_kdf_ctx = NULL;
unsigned char out[32];
OSSL_PARAM _ossl_param_ary[9], *p_ossl_param = _ossl_param_ary;
OSSL_LIB_CTX *_ossl_lib_ctx = NULL;
unsigned int threads;
_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, "argon2id", 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;
}
/*
* Thread support can be turned off; use serialization if we cannot
* set requested number of threads.
*/
threads = parallel_cost;
if (OSSL_set_max_threads(_ossl_lib_ctx, parallel_cost) != 1) {
uint64_t max_threads = OSSL_get_max_threads(_ossl_lib_ctx);
if (max_threads == 0)
threads = 1;
else if (max_threads < parallel_cost)
threads = (unsigned int)max_threads;
}
/* 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, salt, sizeof(salt));
/* Set optional additional data */
*p_ossl_param++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_ARGON2_AD, ad, sizeof(ad));
/* Set optional secret */
*p_ossl_param++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET, secret, sizeof(secret));
/* Set iteration count */
*p_ossl_param++ = OSSL_PARAM_construct_uint32(OSSL_KDF_PARAM_ITER, &iteration_cost);
/* Set threads performing derivation (can be decreased) */
*p_ossl_param++ = OSSL_PARAM_construct_uint(OSSL_KDF_PARAM_THREADS, &threads);
/* Set parallel cost */
*p_ossl_param++ = OSSL_PARAM_construct_uint32(OSSL_KDF_PARAM_ARGON2_LANES, ¶llel_cost);
/* Set memory requirement */
*p_ossl_param++ = OSSL_PARAM_construct_uint32(OSSL_KDF_PARAM_ARGON2_MEMCOST, &memory_cost);
*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;
}
rv = EXIT_SUCCESS;
end:
EVP_KDF_CTX_free(_evp_kdf_ctx);
EVP_KDF_free(_evp_kdf);
OSSL_LIB_CTX_free(_ossl_lib_ctx);
return rv;
}