Function getSigningKey

pkg/signer/request-signature-v4.go:68–74

getSigningKey hmac seed to calculate final signature.

(secret, loc string, t time.Time, serviceType string)

// getSigningKey hmac seed to calculate final signature.
func getSigningKey(secret, loc string, t time.Time, serviceType string) []byte {
	date := sumHMAC([]byte("AWS4"+secret), []byte(t.Format(yyyymmdd)))
	location := sumHMAC(date, []byte(loc))
	service := sumHMAC(location, []byte(serviceType))
	signingKey := sumHMAC(service, []byte("aws4_request"))
	return signingKey
}

// getSignature final signature in hexadecimal form.
func getSignature(signingKey []byte, stringToSign string) string {