openssl3.0如何将pkcs#1的公钥数据转换成EVP_PKEY结构

wenwen_yaya

已于 2025-03-04 10:32:16 修改

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分类专栏：密码学文章标签：算法

于 2025-03-04 10:10:12 首次发布

本文链接：https://blog.youkuaiyun.com/dream_yaya/article/details/144819296

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文章目录

前言

在将项目从 OpenSSL 1.1 升级到 OpenSSL 3.0 的过程中，开发者可能会遇到许多 API 的变化和弃用，导致开发者在实现某些功能时，找不到正确的实现方式。比如：如何实现将PKCS#1的公钥数据转换成EVP_PKEY结构。

一、问题分析

在一些场景中，我们需要将PKCS#1的相关数据转换成EVP_PKEY的格式。在openssl1.1中有相关的底层API
可以进行比较方便的转换，但在openssl3.0中，弃用了很多底层函数，这导致将PKCS#1格式的数据转换成
EVP_PKEY结构比较困难。
`在这里插入代码片`以下内容将分别介绍在openssl1.1和openssl3.0中如何进行转换

二、在openssl1.1下使用如下方式来实现将PKCS#1数据转换成EVP_PKEY结构

注：

以下实现可能存在释放不当的地方，使用时请自行测试，修改。
内存释放需要自行实现，示例实现见下文。
具体实现的代码如下：

int get_evp_public_key_rsa(const unsigned char *key, size_t keyLen, EVP_PKEY **evpKey)
{
    if ((NULL == key) || (keyLen <= 0)) {
        printf("param error\r\n");
        return 0;
    }

    RSA* rsa = d2i_RSAPublicKey(NULL, (const unsigned char**)&key, (long)keyLen);
    if (NULL == rsa) {
        printf("d2i_RSAPublicKey : %ld, %s\r\n", ERR_get_error(), ERR_reason_error_string(ERR_get_error()));
        return 0;
    }
    printf("d2i_RSAPublicKey success\r\n");

    if (NULL == (*evpKey)) {
        *evpKey = EVP_PKEY_new();
        if (NULL == (*evpKey)) {
            printf("EVP_PKEY_new error : %ld, %s\r\n", ERR_get_error(), ERR_reason_error_string(ERR_get_error()));
            SZITRUS_OPENSSL_FREE(RSA, rsa);
            return 0;
        }
        printf("EVP_PKEY_new success\r\n");
    }

    if (1 != EVP_PKEY_set1_RSA(*evpKey, rsa)) {
        printf("EVP_PKEY_new error : %ld, %s\r\n", ERR_get_error(), ERR_reason_error_string(ERR_get_error()));
        SZITRUS_OPENSSL_FREE(RSA, rsa);
        SZITRUS_OPENSSL_FREE(EVP_PKEY, *evpKey);
        *evpKey = NULL;
        return 0;
    }
    printf("EVP_PKEY_set1_RSA success\r\n");

    SZITRUS_OPENSSL_FREE(RSA, rsa);
    return 1;
}

三、在openssl3.0下使用如下方式来实现将PKCS#1数据转换成EVP_PKEY结构

	int get_evp_public_key_rsa_pkcs1(const unsigned char *key, size_t keyLen, EVP_PKEY **evpPublicKey)
    {
        if ((NULL == key) || (keyLen <= 0)) {
            printf("param error\r\n");
            return 0;
        }
        OSSL_DECODER_CTX *dctx = NULL;
        unsigned char *data;
        size_t dataLen = 0;
        EVP_PKEY *tmpEvpPublicKey = NULL;
        data = key;
        dataLen = keyLen;

        dctx = OSSL_DECODER_CTX_new_for_pkey(&tmpEvpPublicKey, "DER", "pkcs1", "RSA", OSSL_KEYMGMT_SELECT_PUBLIC_KEY, NULL, NULL);
        if (dctx == NULL) {
            printf("OSSL_DECODER_CTX_new_for_pkey error : %ld, %s\r\n", ERR_get_error(), ERR_reason_error_string(ERR_get_error()));
            return 0;
        }

        if (1 == OSSL_DECODER_from_data(dctx, &data, &dataLen)) {
            printf("OSSL_DECODER_from_data error : %ld, %s\r\n", ERR_get_error(), ERR_reason_error_string(ERR_get_error()));
            WY_OPENSSL_FREE(OSSL_DECODER_CTX, dctx);
            WY_OPENSSL_FREE(EVP_PKEY, tmpEvpPublicKey);
            tmpEvpPublicKey = NULL;
            return 0;
        }

        *evpPublicKey = EVP_PKEY_dup(tmpEvpPublicKey);
        WY_OPENSSL_FREE(OSSL_DECODER_CTX, dctx);
        WY_OPENSSL_FREE(EVP_PKEY, tmpEvpPublicKey);
        return 1;
    }

测试dome

	#include <stdio.h>
	#include "openssl/evp.h"
	static const char rsa_pkcs1[275] = {
	    0x03, 0x82, 0x01, 0x0f, 0x00, 0x30, 0x82, 0x01, 0x0a, 0x02, 0x82, 0x01, 0x01, 0x00, 0xe2, 0x3e,
	    0xa5, 0x2a, 0xd6, 0xcb, 0x6c, 0x02, 0x64, 0xcd, 0x89, 0xfa, 0xd5, 0x99, 0x72, 0x50, 0x7d, 0xb8,
	    0xb2, 0x27, 0xc9, 0x15, 0xda, 0xff, 0x10, 0x53, 0xdd, 0x69, 0xa5, 0xc4, 0x01, 0x02, 0xa9, 0xfe,
	    0x49, 0x71, 0x95, 0xd8, 0xcf, 0xb3, 0x02, 0x9f, 0xf7, 0xfe, 0x6f, 0x08, 0xde, 0xfb, 0x69, 0x4b,
	    0xc3, 0xd6, 0xe4, 0x2f, 0xe8, 0x4a, 0xe6, 0x3f, 0x1f, 0x5b, 0xf4, 0x3b, 0xf1, 0x0c, 0x49, 0xf3,
	    0x91, 0x68, 0xd4, 0x48, 0xf5, 0x41, 0x74, 0x14, 0x3f, 0x5d, 0x7c, 0x99, 0x89, 0x9d, 0x8d, 0x52,
	    0xc9, 0x5d, 0x8b, 0x18, 0xf9, 0xe1, 0x39, 0x06, 0x1e, 0x0a, 0x2d, 0x19, 0xbb, 0xa4, 0x30, 0xb4,
	    0xb4, 0x27, 0x10, 0x22, 0x38, 0xbc, 0x38, 0xf0, 0x6f, 0x4a, 0xfa, 0x34, 0x93, 0x0e, 0x9b, 0x2b,
	    0x11, 0xb4, 0x15, 0x2f, 0xe8, 0x7d, 0xda, 0x65, 0x8e, 0x49, 0x85, 0xdd, 0x56, 0x5d, 0xc1, 0x3a,
	    0x45, 0x8e, 0xe1, 0x74, 0x9a, 0x82, 0xe2, 0x7d, 0x8f, 0x65, 0x3c, 0xbf, 0xc5, 0xf5, 0x99, 0xd8,
	    0x58, 0x32, 0x0e, 0x92, 0x30, 0x21, 0x07, 0xc8, 0x4f, 0x46, 0x04, 0xfb, 0x7f, 0x75, 0x61, 0xb0,
	    0xbd, 0x55, 0xdb, 0x4b, 0xc3, 0xec, 0xe2, 0xab, 0x98, 0x53, 0xcd, 0x0a, 0x41, 0x36, 0x88, 0xa9,
	    0x8c, 0x1d, 0xd9, 0xed, 0x6c, 0xb4, 0x1c, 0x95, 0x96, 0x40, 0xa1, 0x59, 0x20, 0xa4, 0x36, 0xf3,
	    0x17, 0x03, 0x2d, 0x30, 0x4d, 0xdc, 0xa0, 0xdd, 0x8a, 0x68, 0x26, 0x89, 0x54, 0x62, 0xf4, 0x08,
	    0x52, 0xe6, 0x3e, 0x1c, 0x19, 0x55, 0xc4, 0x63, 0xc8, 0x0f, 0x63, 0xe8, 0x59, 0x11, 0x7f, 0x11,
	    0x5e, 0xc3, 0x07, 0x92, 0x24, 0x57, 0x9d, 0x8c, 0x03, 0xf0, 0x69, 0xe0, 0xe6, 0x1d, 0x54, 0x00,
	    0x63, 0x22, 0x5a, 0x30, 0xf2, 0x84, 0x84, 0x2e, 0x90, 0xc7, 0x68, 0x8c, 0x94, 0x45, 0x02, 0x03,
	    0x01, 0x00, 0x01
	};
	
	int main()
	{
		int ret = 0;
		char* publicKey = rsa_pkcs1;
		size_t publicKeyLen = strlen(rsa_pkcs1);
		EVP_PKEY *evpKey = NULL;
		ret = get_evp_public_key_rsa_pkcs1(publicKey, publicKeyLen, &evpKey);
		if (1 ！= ret) {
			printf("get evp public key error, [%d]\r\n", ret);
	        return 1;
		}
		printf("get evp public key success\r\n");
		WY_OPENSSL_FREE(EVP_PKEY, evpKey );
		return 0;
	}

四、openssl相关函数的内存释放示例

// openssl相关函数的内存释放示例
#define WY_OPENSSL_FREE(name, ptr) openssl_##name##_free(ptr)
void openssl_EVP_PKEY_free(EVP_PKEY *ptr)
{
	if (NULL != ptr) {
        EVP_PKEY_free(ptr);
        ptr = NULL;
    }
}