NewECDSAPublicKey creates a ECDSA public key from a PEM public key.

NewEngine returns a new rule engine.

NewCallback returns the callback object or function for the given callback name.

NewReflectedCallback returns the callback object or function of the given callback name.

Verify returns a non-nil error when message verification against the public key failed, nil otherwise.

VerifyRuleSignature returns a non-nil error when the rule signature is invalid, nil otherwise.