在P中将PEM转换为DER-Java 学习之路

我有PEM格式的证书，我想使用C语言中的OpenSLL函数将其转换为DER格式 .

我该怎么做？

谢谢 .

2 回答

你可以这样做 -

#include <stdio.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/err.h>

void convert(char* cert_filestr,char* certificateFile)
{
    X509* x509 = NULL;
    FILE* fd = NULL,*fl = NULL;

    fl = fopen(cert_filestr,"rb");
    if(fl) 
    {
        fd = fopen(certificateFile,"w+");
        if(fd) 
        {
            x509 = PEM_read_X509(fl,&x509,NULL,NULL);
            if(x509) 
            {
                 i2d_X509_fp(fd, x509);
            }
            else 
            {
                printf("failed to parse to X509 from fl");
            }
            fclose(fd);
        }
        else
        {
             printf("can't open fd");
        }
        fclose(fl);
    }
    else 
    {
         printf("can't open f");
    }
}


int main()
{
    convert("abc.pem","axc.der");
    return 0;
}

回复于 2024-04-29T04:22:03+08:00

试试这个 -

void convert(const unsigned char * pem_string_cert,char* certificateFile)
{
    X509* x509 = NULL;
    FILE* fd = NULL;

    BIO *bio;

    bio = BIO_new(BIO_s_mem());
    BIO_puts(bio, pem_string_cert);
    x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL);

    fd = fopen(certificateFile,"w+");
    if(fd) 
    {
            i2d_X509_fp(fd, x509);
    }
    else 
    {
         printf("can't open fd");
    }
    fclose(fd);
}

回复于 2024-04-29T04:22:03+08:00

在P中将PEM转换为DER

2 回答

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