fn derive_signing_key(
secret_key: &str,
date_stamp: &str,
region: &str,
service: &str,
) -> Vec<u8> ⓘExpand description
Derive the AWS SigV4 signing key for a given date, region, and service.
kDate = HMAC("AWS4" + secret, dateStamp)
kRegion = HMAC(kDate, region)
kService = HMAC(kRegion, service)
kSigning = HMAC(kService, "aws4_request")