# Functions
GetDefaultAccesskeyStorage initiates an empty DefaultAccesskeyStorage.
GetDefaultAuthenticator creates an empty DefaultAuthenticator instance.
IsEmpty verify whether the inputted string is empty.
Sign gets a signature string with given bytes.
SignWithParams returns a signature with giving params and metadata.
# Structs
ConsumerSignFilter signs the request on consumer side.
DefaultAccesskeyStorage is the default implementation of AccesskeyStorage.
DefaultAuthenticator is the default implementation of Authenticator.
ProviderAuthFilter verifies the correctness of the signature on provider side.