func getAlgo()

in aws_signing_helper/cert_store_signer_darwin.go [370:403]

• 33 lines of code
• 11 McCabe index (conditional complexity)

func getAlgo(cert *x509.Certificate, hash crypto.Hash) (algo C.SecKeyAlgorithm, err error) {
	switch cert.PublicKey.(type) {
	case *ecdsa.PublicKey:
		switch hash {
		case crypto.SHA1:
			algo = C.kSecKeyAlgorithmECDSASignatureDigestX962SHA1
		case crypto.SHA256:
			algo = C.kSecKeyAlgorithmECDSASignatureDigestX962SHA256
		case crypto.SHA384:
			algo = C.kSecKeyAlgorithmECDSASignatureDigestX962SHA384
		case crypto.SHA512:
			algo = C.kSecKeyAlgorithmECDSASignatureDigestX962SHA512
		default:
			err = ErrUnsupportedHash
		}
	case *rsa.PublicKey:
		switch hash {
		case crypto.SHA1:
			algo = C.kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA1
		case crypto.SHA256:
			algo = C.kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA256
		case crypto.SHA384:
			algo = C.kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA384
		case crypto.SHA512:
			algo = C.kSecKeyAlgorithmRSASignatureDigestPKCS1v15SHA512
		default:
			err = ErrUnsupportedHash
		}
	default:
		err = errors.New("unsupported key type")
	}

	return algo, err
}