Creates and returns a new key object containing a private key. If key is a
string or Buffer, format is assumed to be 'pem'; otherwise, key must be an object with the properties described above.
If the private key is encrypted, a passphrase must be specified. The length
of the passphrase is limited to 1024 bytes.
Creates and returns a new key object containing a private key. If
keyis a string orBuffer,formatis assumed to be'pem'; otherwise,keymust be an object with the properties described above.If the private key is encrypted, a
passphrasemust be specified. The length of the passphrase is limited to 1024 bytes.