ASN1解碼器（libtasn1-3.3）打印DD證書的內容pem

Question

如何使用ASN1解碼器（libtasn1-3.3）打印作爲參數接收的DD證書pem的內容？

Answer 1

asn1Decoding爲libtasn1-3.3

一個程序。如果該程序爲你工作，那麼ansn1Decoding具有解碼功能，您可以使用（當然，你必須適應了這些代碼。如果你不想通過移動解碼碼出你的程序修改，那麼你要複製的解碼碼到您的代碼）：

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

如果你想從你的程序中調用解碼，那麼你必須

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); 
}