在C中打开SSL证书指纹

您可以使用openssl加密API生成哈希.请参阅 http://www.openssl.org/docs/crypto/EVP_DigestInit.html的openssl加密文档.以下是示例程序.使用您的PEM证书文本替换以下程序中的示例文本.

#include <st@L_618_10@.h>
#include <openssl/evp.h>

main(int argc,char *argv[])
{
    EVP_MD_CTX mdctx;
    const EVP_MD *md;
    char mess1[] = "Test message\n";
    char mess2[] = "Hello World\n";
    unsigned char md_value[EVP_MAX_MD_SIZE];
    int md_len,i;

    OpenSSL_add_all_digests();

    if(!argv[1]) {
       printf("Usage: mdtest digestname\n");
       exit(1);
    }

    md = EVP_get_digestbyname(argv[1]);

    if(!md) {
       printf("UnkNown message digest %s\n",argv[1]);
       exit(1);
    }

    EVP_MD_CTX_init(&mdctX);
    EVP_DigesTinit_ex(&mdctx,md,null);
    EVP_Digestupdate(&mdctx,mess1,strlen(mess1));
    EVP_Digestupdate(&mdctx,mess2,strlen(mess2));
    EVP_DigestFinal_ex(&mdctx,md_value,&md_len);
    EVP_MD_CTX_cleanup(&mdctX);

    printf("Digest is: ");
    for(i = 0; i < md_len; i++) printf("%02x",md_value[i]);
    printf("\n");
}