writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrSignatureVersionNotSupported), r.URL)
		atomic.AddUint64(&globalHTTPStats.rejectedRequestsAuth, 1)
	})
}

func validateSignature(atype authType, r *http.Request) (auth.Credentials, bool, APIErrorCode) {
	var cred auth.Credentials
	var owner bool
	var s3Err APIErrorCode
	switch atype {
	case authTypeUnknown, authTypeStreamingSigned:

		return
	}

	objectAPI := api.ObjectAPI()
	if objectAPI == nil {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
		return
	}

	cred, owner, s3Err := validateSignature(getRequestAuthType(r), r)
	if s3Err != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Err), r.URL)
		return
	}