> From: openssl-users <openssl-users-bounces@xxxxxxxxxxx> On Behalf Of Jason Qian via openssl-users > Subject: Need help - Client Authentication > > My question is regarding "SSL_CTX_set_default_passwd_cb_userdata". > Do I need to set the password? I tried with/without the call and all seemed to work fine. "SSL_CTX_set_default_passwd_cb_userdata()" is only useful is you are also calling "SSL_CTX_set_default_passwd_cb()" to set your own callback function, which I don't see in your posted code. So, no. The callback would be used when the client certificate is encrypted and needs a password. -spw
