In message <[EMAIL PROTECTED]> on Thu, 10 Jul 2003 16:24:48 +0900, "Wu Junwei" <[EMAIL
PROTECTED]> said:
Wu.Junwei> How can I get the DN of a certificate in ASN.1 format
Wu.Junwei> from a X509_NAME object?
(I'm starting to believe we need a HOWTO on understanding all those
acronyms)
What you're writing above is really confusing, so here's my guess at
what you meant:
1. you have a certificate. (It's structure is defined in the ASN.1
language by necessity).
2. the certificate is in binary format (DER, which is an encoding
format)
3. you need to figure out how to load it in your program.
4. you need to figure out how to get an X509_NAME from the result of
the load.
If all that is correct, the following (untested!) snipet of code
should work:
FILE *f = fopen("yourfile","r");
X509 *x509;
X509_NAME *x509name;
if (f == NULL) { you_error_routine; }
x509 = d2i_X509_fp(f, NULL);
if (x509 == NULL) { you_error_routine; }
x509name = X509_get_subject_name(x509);
After that, you can do what you need with x509name. If you need to
print it, for example, you can use X509_NAME_print_ex (see the
corresponding manual).
--
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