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signing_key

object_storage_proxy::credentials::signer

Function signing_key 

Source 
pub fn signing_key(
    datetime: &DateTime<Utc>,
    secret_key: &str,
    region: &str,
    service: &str,
) -> Result<Vec<u8>, String>
Expand description

Derive (or return a cached copy of) the SigV4 signing key.

Computes HMAC(HMAC(HMAC(HMAC("AWS4" + secret, date), region), service), "aws4_request") and stores the result in the process-wide SIGNING_KEY_CACHE. The cache entry is valid for the entire UTC calendar day; stale entries from previous days are evicted lazily on the first miss of the new day.