func createcredsJSON()

in google_guest_agent/windows_accounts.go [169:213]

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

func createcredsJSON(k metadata.WindowsKey, pwd string) (*credsJSON, error) {
	mod, err := base64.StdEncoding.DecodeString(k.Modulus)
	if err != nil {
		return nil, fmt.Errorf("error decoding modulus: %v", err)
	}
	exp, err := base64.StdEncoding.DecodeString(k.Exponent)
	if err != nil {
		return nil, fmt.Errorf("error decoding exponent: %v", err)
	}

	key := &rsa.PublicKey{
		N: new(big.Int).SetBytes(mod),
		E: int(new(big.Int).SetBytes(exp).Int64()),
	}

	if k.HashFunction == "" {
		k.HashFunction = "sha1"
	}

	var hashFunc hash.Hash
	switch k.HashFunction {
	case "sha1":
		hashFunc = sha1.New()
	case "sha256":
		hashFunc = sha256.New()
	case "sha512":
		hashFunc = sha512.New()
	default:
		return nil, fmt.Errorf("unknown hash function requested: %q", k.HashFunction)
	}

	encPwd, err := rsa.EncryptOAEP(hashFunc, rand.Reader, key, []byte(pwd), nil)
	if err != nil {
		return nil, fmt.Errorf("error encrypting password: %v", err)
	}

	return &credsJSON{
		PasswordFound:     true,
		Exponent:          k.Exponent,
		Modulus:           k.Modulus,
		UserName:          k.UserName,
		HashFunction:      k.HashFunction,
		EncryptedPassword: base64.StdEncoding.EncodeToString(encPwd),
	}, nil
}