Golang Support

[kushalbikriapp]

Can we see the golang implementation for this?

[kushalhalder]

func FetchPublicKey() (publicKey *TPublicKeyResponse, err error) {
	req := httplib.Get(beego.AppConfig.String("TRUECALLER_PUBLIC_KEY_URL"))
	req.SetTLSClientConfig(&tls.Config{InsecureSkipVerify: true})
	req.Debug(true)

	str, err := req.String()
	if err != nil {
		l.Printf("Error: %v", err)
		return nil, err
	}
	l.Println(str)
	pr := TPublicKeyResponse{}
	_ = json.Unmarshal([]byte(str), &pr)
	return &pr, nil
}

func VerifyPayload(s *SDKResponse) bool {
	publicKeyString, err := FetchPublicKey()
	if err != nil {
		l.Printf("Error: %v", err)
		return false
	}
	publicKeyInterface, err := x509.ParsePKIXPublicKey([]byte(publicKeyString.Key))
	publicKey, isRSAPublicKey := publicKeyInterface.(*rsa.PublicKey)
	if !isRSAPublicKey {
		l.Printf("isRSAPublicKey: %v", isRSAPublicKey)
		return false
	}
	hashed := sha256.Sum256([]byte(s.Payload))
	sDec, esDec := base64.StdEncoding.DecodeString(s.Signature)
	if esDec != nil {
		l.Printf("Signature Decode Error: %v", esDec)
		return false
	}
	e := rsa.VerifyPKCS1v15(publicKey, crypto.SHA512, hashed[:], sDec)
	if e != nil {
		l.Printf("Verify: %v", e)
		return false
	}

	return true
}

This is what I have, but it fails at
publicKey, isRSAPublicKey := publicKeyInterface.(*rsa.PublicKey)

[kushalhalder]

The error at publicKeyInterface, err := x509.ParsePKIXPublicKey([]byte(publicKeyString.Key)) is PublicKey Parse error: asn1: syntax error: sequence truncated