CODEWITHSUNDEEP
opensslcertificatessl-certificatex509certificatex509
Balamurugan
Balamurugan

Reputation: 2359

how to convert a ASN1_object to readable format using openssl library .?

X509_extension structure have a variable of ASN1_object . i want to read what is the content in that . Can any one tell me how to do that

Upvotes: 3

Views: 4118

Answers (2)

fabiano kuss
fabiano kuss

Reputation: 1

You can access the data value of the object as int the code fragment below:

ASN1_OBJECT *obj = X509_EXTENSION_get_object(ex);
char *dt_value = (char *)ext->value->data
printf("Object Value: %s\n", dt_value);

Upvotes: 0

Fauth
Fauth

Reputation: 747

An ASN1_OBJECT is just OpenSSL's representation of an OID, an object identifier. If you only want to know it's OID, then:

ASN1_OBJECT *obj = X509_EXTENSION_get_object(ex); // ex is your X509_EXTENSION *
char buff[1024];
OBJ_obj2txt(buff, 1024, obj, 0); // 0 means it will prefer a textual representation (if available) rather than the numerical one

Then buf will contain a C string with the OID.

Regards.

Upvotes: 7

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