Most third-party PKI vendors and some browsers have utilities to generate certificates and private keys. These utilities are typically graphical wizards that prompt you through a series of questions to define a distinguished name and a common name for the certificate.
Follow the instructions provided by the wizard to create certificate requests. Once you receive the signed PKCS #12-format certificate, use certpk12 to generate a certificate file and a private key file. Concatenate the two files into a servername.crt file, where servername is the name of the server, and place it in the server’s installation directory. By default, the certificates for Adaptive Server’s are stored in %SYBASE%\%SYBASE_ASE%\certificates. See “certpk12”.