Quite a few of the openssl functions require a key or a certificate parameter. Following methods may be used to get them:
Certificates
OpenSSL X.509
) returned from openssl_x509_read()-----BEGIN CERTIFICATE-----
Certificate Signing Requests (CSRs)
OpenSSL X.509 CSR
) returned from openssl_csr_new()-----BEGIN CERTIFICATE REQUEST-----
Public/Private Keys
OpenSSL key
) returned from openssl_get_publickey() or openssl_get_privatekey()OpenSSL X.509
) -----BEGIN PUBLIC KEY-----
array($key, $passphrase)
where $key represents a key specified using the file:// or textual content notation above, and $passphrase represents a string containing the passphrase for that private key