func()

in aws_signing_helper/file_system_signer.go [42:77]

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

func (fileSystemSigner *FileSystemSigner) Sign(rand io.Reader, digest []byte, opts crypto.SignerOpts) (signature []byte, err error) {
	privateKey, _, _ := fileSystemSigner.readCertFiles()
	var hash []byte
	switch opts.HashFunc() {
	case crypto.SHA256:
		sum := sha256.Sum256(digest)
		hash = sum[:]
	case crypto.SHA384:
		sum := sha512.Sum384(digest)
		hash = sum[:]
	case crypto.SHA512:
		sum := sha512.Sum512(digest)
		hash = sum[:]
	default:
		return nil, ErrUnsupportedHash
	}

	ecdsaPrivateKey, ok := privateKey.(*ecdsa.PrivateKey)
	if ok {
		sig, err := ecdsa.SignASN1(rand, ecdsaPrivateKey, hash[:])
		if err == nil {
			return sig, nil
		}
	}

	rsaPrivateKey, ok := privateKey.(*rsa.PrivateKey)
	if ok {
		sig, err := rsa.SignPKCS1v15(rand, rsaPrivateKey, opts.HashFunc(), hash[:])
		if err == nil {
			return sig, nil
		}
	}

	log.Println("unsupported algorithm")
	return nil, errors.New("unsupported algorithm")
}