The keytype parameter is used to specify what type of key is to be generated. Valid values are "RSA", which is the default, "DSA" and "EC". The name and challenge attributes are required in all cases. The keytype attribute is optional for RSA key generation and required for DSA and EC key generation. The keyparams attribute is required for DSA and EC key generation and ignored for RSA key generation. PQG is a synonym for keyparams. That is, you may specify keyparams="pqg-params" or pqg="pqg-params".