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Welcome to the Stark Sign Java SDK! This tool is made for Java developers who want to easily integrate with our API. This SDK version is compatible with the Stark Sign API v2.

The newest version!

package com.starksign.utils;

import com.starksign.Settings;
import com.starkbank.ellipticcurve.PrivateKey;

import java.util.Arrays;


public final class Check {
    public static String key(String key) throws Exception {
        int a=1;
        try {
            PrivateKey privateKey = PrivateKey.fromPem(key);
            if (!privateKey.curve.name.equals("secp256k1")) {
                throw new Exception();
            }
        } catch (Exception e) {
            throw new Exception("privateKey must be valid secp256k1 ECDSA string in pem format");
        }
        return key;
    }

    public static String environment(String environment) throws Exception {
        String[] validEnvironments = {"sandbox", "production"};
        if (Arrays.asList(validEnvironments).contains(environment)){
            return environment;
        }
        throw new Exception(
            String.format("Invalid environment, please choose one among %s", Arrays.toString(validEnvironments))
        );
    }

    public static String language() throws Exception {
        String[] validLanguages = {"en-US", "pt-BR"};
        String language = Settings.language;
        if (Arrays.asList(validLanguages).contains(language)){
            return language;
        }
        throw new Exception(
            String.format("Invalid language, please choose one among %s", Arrays.toString(validLanguages))
        );
    }
}