ASN1解码器（libtasn1-3.3）打印DD证书pem的内容

Question

如何使用ASN1解码器（libtasn1-3.3）打印作为参数接收的DD证书pem的内容？

Answer 1

asn1Decoding是来自libtasn1-3.3

的程序

如果该程序适合你，那么ansn1Decoding有一个你可以使用的解码功能（当然你必须调整这个代码。如果你不想通过将解码代码移到你的程序来修改，然后你必须将解码代码复制到你的代码中）：

static int decode (asn1_node definitions, const char *typeName, void *der, int der_len, int benchmark)

如果你想从程序中调用解码，那么你必须

asn1_node definitions = NULL;
int asn1_result = ASN1_SUCCESS;
unsigned char *der;
int der_len = 0, benchmark = 0;
// Please test with asn1Decoding application manually to find the correct typeName for your code
char typeName[] = {"PKIX1.Certificate"};

asn1_result = asn1_parser2tree ("Your File Name", &definitions, errorDescription);
if (asn1_result != ASN1_SUCCESS) {    exit(1); }
{
    size_t tmplen;
    der = (unsigned char *) read_binary_file (inputFileDerName, &tmplen);
    der_len = tmplen;
}

if (der == NULL)
{
      asn1_delete_structure (&definitions);
      exit (1);
}

if (decode (definitions, typeName, der, der_len, benchmark) != ASN1_SUCCESS)
{
      asn1_delete_structure (&definitions);
}