Key/Certificate parameters
Quite a few of the openssl functions require a key or a certificate parameter. PHP 4.0.5 and earlier have to use a key or certificate resource returned by one of the openssl_get_xxx functions. Later versions may use one of the following methods:
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Certificates
- An X.509 resource returned from openssl_x509_read()
- A string having the format file://path/to/cert.pem; the named file must contain a PEM encoded certificate
- A string containing the content of a certificate, PEM encoded
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Public/Private Keys
- A key resource returned from openssl_get_publickey() or openssl_get_privatekey()
- For public keys only: an X.509 resource
- A string having the format file://path/to/file.pem - the named file must contain a PEM encoded certificate/private key (it may contain both)
- A string containing the content of a certificate/key, PEM encoded
- For private keys, you may also use the syntax 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
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