openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA

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文章目录

- openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_paramvalidate.c
- 概述
- 笔记
- END

openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_paramvalidate.c

概述

OPENSSL_hexstr2buf_ex 将16禁止字符串填充到16进制buffer
BIO_new_mem_buf 有用, 可以内存的内容转为bio, 不用非要落地为文件才能操作

将buffer中写的DSA param 载入到bio
从bio产生_evp_pkey_dsa

从 pkey产生 _evp_pkey_ctx1, 检查 _evp_pkey_ctx1的param
设置新的param, 和 _evp_pkey_dsa 一起, 产生新的_evp_pkey_ctx2, 检查 _evp_pkey_ctx2的param
再次设置一个新的param, 用OSSL_PARAM_merge合并_evp_pkey_ctx2的param, 作为新的param
用新的param产生新的ctx => _evp_pkey_ctx3, 检查 _evp_pkey_ctx3的参数
取 _evp_pkey_ctx3的EVP_PKEY, 并打印EVP_PKEY的公用参数和param

笔记

/*!
\file EVP_PKEY_DSA_paramvalidate.c
\note 
openssl3.2 - 官方demo学习 - pkey - EVP_PKEY_DSA_paramvalidate.c
OPENSSL_hexstr2buf_ex 将16禁止字符串填充到16进制buffer
BIO_new_mem_buf 有用, 可以内存的内容转为bio, 不用非要落地为文件才能操作将buffer中写的DSA param 载入到bio
从bio产生_evp_pkey_dsa
1. 从 pkey产生 _evp_pkey_ctx1, 检查 _evp_pkey_ctx1的param
2. 设置新的param, 和 _evp_pkey_dsa 一起, 产生新的_evp_pkey_ctx2, 检查 _evp_pkey_ctx2的param
3. 再次设置一个新的param, 用OSSL_PARAM_merge合并_evp_pkey_ctx2的param, 作为新的param
4. 用新的param产生新的ctx => _evp_pkey_ctx3, 检查 _evp_pkey_ctx3的参数
5. 取 _evp_pkey_ctx3的EVP_PKEY, 并打印EVP_PKEY的公用参数和param
*//*-* Copyright 2022-2023 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*//** Example showing how to validate DSA parameters.** Proper FIPS 186-4 DSA (FFC) parameter validation requires that all* the parameters used during parameter generation are supplied* when doing the validation. Unfortunately saving DSA parameters as* a PEM or DER file does not write out all required fields. Because* of this the default provider normally only does a partial* validation. The FIPS provider will however try to do a full* validation. To force the default provider to use full* validation the 'seed' that is output during generation must be* added to the key. See doc/man7/EVP_PKEY-FFC for more information.*/#include <openssl/evp.h>
#include <openssl/core_names.h>
#include <openssl/pem.h>
#include "dsa.h"#include "my_openSSL_lib.h"/* The following values were output from the EVP_PKEY_DSA_paramgen demo */
static const char dsapem[] ="-----BEGIN DSA PARAMETERS-----\n""MIICLAKCAQEA1pobSR1FJ3+Tvi0J6Tk1PSV2owZey1Nuo847hGw/59VCS6RPQEqr\n""vp5fhbvBjupBeVGA/AMH6rI4i4h6jlhurrqH1CqUHVcDhJzxV668bMLiP3mIxg5o\n""9Yq8x6BnSOtH5Je0tpeE0/fEvvLjCwBUbwnwWxzjANcvDUEt9XYeRrtB2v52fr56\n""hVYz3wMMNog4CEDOLTvx7/84eVPuUeWDRQFH1EaHMdulP34KBcatEEpEZapkepng\n""nohm9sFSPQhq2utpkH7pNXdG0EILBtRDCvUpF5720a48LYofdggh2VEZfgElAGFk\n""dW/CkvyBDmGIzil5aTz4MMsdudaVYgzt6wIhAPsSGC42Qa+X0AFGvonb5nmfUVm/\n""8aC+tHk7Nb2AYLHXAoIBADx5C0H1+QHsmGKvuOaY+WKUt7aWUrEivD1zBMJAQ6bL\n""Wv9lbCq1CFHvVzojeOVpn872NqDEpkx4HTpvqhxWL5CkbN/HaGItsQzkD59AQg3v\n""4YsLlkesq9Jq6x/aWetJXWO36fszFv1gpD3NY3wliBvMYHx62jfc5suh9D3ZZvu7\n""PLGH4X4kcfzK/R2b0oVbEBjVTe5GMRYZRqnvfSW2f2fA7BzI1OL83UxDDe58cL2M\n""GcAoUYXOBAfZ37qLMm2juf+o5gCrT4CXfRPu6kbapt7V/YIc1nsNgeAOKKoFBHBQ\n""gc5u5G6G/j79FVoSDq9DYwTJcHPsU+eHj1uWHso1AjQ=\n""-----END DSA PARAMETERS-----\n";static const char hexseed[] ="cba30ccd905aa7675a0b81769704bf3c""ccf2ca1892b2eaf6b9e2b38d9bf6affc""42ada55986d8a1772b442770954d0b65";
const int gindex = 42;
const int pcounter = 363;
static const char digest[] = "SHA384";/** Create a new dsa param key that is the combination of an existing param key* plus extra parameters.*/
EVP_PKEY_CTX *create_merged_key(EVP_PKEY *dsaparams, const OSSL_PARAM *newparams,OSSL_LIB_CTX *libctx, const char *propq)
{EVP_PKEY_CTX *out = NULL;EVP_PKEY_CTX *ctx = NULL;EVP_PKEY *pkey = NULL;OSSL_PARAM *mergedparams = NULL;OSSL_PARAM *loadedparams = NULL;/* Specify EVP_PKEY_KEY_PUBLIC here if you have a public key */if (EVP_PKEY_todata(dsaparams, EVP_PKEY_KEY_PARAMETERS, &loadedparams) <= 0) {fprintf(stderr, "EVP_PKEY_todata() failed\n");goto cleanup;}mergedparams = OSSL_PARAM_merge(loadedparams, newparams);if (mergedparams == NULL) {fprintf(stderr, "OSSL_PARAM_merge() failed\n");goto cleanup;}ctx = EVP_PKEY_CTX_new_from_name(libctx, "DSA", propq);if (ctx == NULL) {fprintf(stderr, "EVP_PKEY_CTX_new_from_name() failed\n");goto cleanup;}if (EVP_PKEY_fromdata_init(ctx) <= 0|| EVP_PKEY_fromdata(ctx, &pkey,EVP_PKEY_KEY_PARAMETERS, mergedparams) <= 0) {fprintf(stderr, "EVP_PKEY_fromdata() failed\n");goto cleanup;}out = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq);if (out == NULL) {fprintf(stderr, "EVP_PKEY_CTX_new_from_pkey() failed\n");goto cleanup;}cleanup:EVP_PKEY_free(pkey);OSSL_PARAM_free(loadedparams);OSSL_PARAM_free(mergedparams);EVP_PKEY_CTX_free(ctx);return out;
}int main(int argc, char **argv)
{int ret = EXIT_FAILURE;OSSL_LIB_CTX *_ossl_lib_ctx = NULL;const char *propq = NULL;EVP_PKEY *_evp_pkey_dsa = NULL;EVP_PKEY_CTX *_evp_pkey_ctx1 = NULL;EVP_PKEY_CTX *_evp_pkey_ctx2 = NULL;EVP_PKEY_CTX *_evp_pkey_ctx3 = NULL;BIO *bio_in = NULL;OSSL_PARAM params[6];unsigned char seed[64];size_t seedlen;/*! openssl有各种相关函数, 吃惊OPENSSL_hexstr2buf_ex 将16禁止字符串填充到16进制buffer*/if (!OPENSSL_hexstr2buf_ex(seed, sizeof(seed), &seedlen, hexseed, '\0'))goto cleanup;/** This example loads the PEM data from a memory buffer* Use BIO_new_fp() to load a PEM file instead*//*!BIO_new_mem_buf 有用, 可以内存的内容转为bio, 不用非要落地为文件才能操作*/bio_in = BIO_new_mem_buf(dsapem, (int)strlen(dsapem));if (bio_in == NULL) {fprintf(stderr, "BIO_new_mem_buf() failed\n");goto cleanup;}/* Load DSA params from pem data */_evp_pkey_dsa = PEM_read_bio_Parameters_ex(bio_in, NULL, _ossl_lib_ctx, propq);if (_evp_pkey_dsa == NULL) {fprintf(stderr, "Failed to load dsa params\n");goto cleanup;}_evp_pkey_ctx1 = EVP_PKEY_CTX_new_from_pkey(_ossl_lib_ctx, _evp_pkey_dsa, propq);if (_evp_pkey_ctx1 == NULL) {fprintf(stderr, "EVP_PKEY_CTX_new_from_pkey() failed\n");goto cleanup;}/** When using the default provider this only does a partial check to* make sure that the values of p, q and g are ok.* This will fail however if the FIPS provider is used since it does* a proper FIPS 186-4 key validation which requires extra parameters*/if (EVP_PKEY_param_check(_evp_pkey_ctx1) <= 0) {fprintf(stderr, "Simple EVP_PKEY_param_check() failed \n");goto cleanup;}/** Setup parameters that we want to add.* For illustration purposes it deliberately omits a required parameter.*/params[0] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE,"fips186_4", 0);/* Force it to do a proper validation by setting the seed */params[1] = OSSL_PARAM_construct_octet_string(OSSL_PKEY_PARAM_FFC_SEED,(void *)seed, seedlen);params[2] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_GINDEX, (int *)&gindex);params[3] = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_PCOUNTER, (int *)&pcounter);params[4] = OSSL_PARAM_construct_end();/* generate a new key that is the combination of the existing key and the new params */_evp_pkey_ctx2 = create_merged_key(_evp_pkey_dsa, params, _ossl_lib_ctx, propq);if (_evp_pkey_ctx2 == NULL)goto cleanup;/* This will fail since not all the parameters used for key generation are added */if (EVP_PKEY_param_check(_evp_pkey_ctx2) > 0) {fprintf(stderr, "EVP_PKEY_param_check() should fail\n");goto cleanup;}/** Add the missing parameters onto the end of the existing list of params* If the default was used for the generation then this parameter is not* needed*/params[4] = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_DIGEST,(char *)digest, 0);params[5] = OSSL_PARAM_construct_end();_evp_pkey_ctx3 = create_merged_key(_evp_pkey_dsa, params, _ossl_lib_ctx, propq);if (_evp_pkey_ctx3 == NULL)goto cleanup;if (EVP_PKEY_param_check(_evp_pkey_ctx3) <= 0) {fprintf(stderr, "EVP_PKEY_param_check() failed\n");goto cleanup;}if (!dsa_print_key(EVP_PKEY_CTX_get0_pkey(_evp_pkey_ctx3), 0, _ossl_lib_ctx, propq))goto cleanup;ret = EXIT_SUCCESS;
cleanup:EVP_PKEY_free(_evp_pkey_dsa);EVP_PKEY_CTX_free(_evp_pkey_ctx3);EVP_PKEY_CTX_free(_evp_pkey_ctx2);EVP_PKEY_CTX_free(_evp_pkey_ctx1);BIO_free(bio_in);return ret;
}