# Functions
New session.
SignerDefault signatureDefault signer payload: query or body header https://docs.aws.amazon.com/general/latest/gr/sigv4-create-canonical-request.html eg.
ValidateDefault validate signature.
# Constants
hmac-sha256.
# Variables
error list.
error list.
error list.
error list.
error list.
error list.
error list.
# Type aliases
SignatureType is type of Authorization requested for a given request.
Signer sign the request before Do().
Validator validate the request data.