Hello: I use the openssl to write some certificate file. I have two question here. Could you so kind to tell me how to solve the problems? 1. How to get the OID string? ex: 1.2.840.10040.4.3 2. How to add my own extension field with binary data(such as a bmp file)? Thank you very much. Student: shunza ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]