urity.sdk.crypto-samples.4.4.0-alpha.source-code.SignAndVerify Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016, Virgil Security, Inc.
 *
 * All rights reserved.
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of virgil nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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 */

import java.io.IOException;

import com.virgilsecurity.crypto.VirgilBase64;
import com.virgilsecurity.sdk.crypto.Crypto;
import com.virgilsecurity.sdk.crypto.KeyPair;
import com.virgilsecurity.sdk.crypto.PrivateKey;
import com.virgilsecurity.sdk.crypto.PublicKey;
import com.virgilsecurity.sdk.crypto.VirgilCrypto;

/**
 * This sample shows how to sign and verify data.
 * 
 * @author Andrii Iakovenko
 *
 */
public class SignAndVerify {

    /**
     * @param args
     * @throws IOException
     */
    public static void main(String[] args) throws IOException {
        String text = "Sign me, Please!!!";

        // Initialize Crypto
        Crypto crypto = new VirgilCrypto();

        // Generate generate public/private key pair for key recipient
        KeyPair keyPair = crypto.generateKeys();

        PublicKey publicKey = keyPair.getPublicKey();
        PrivateKey privateKey = keyPair.getPrivateKey();

        // Sign data with private key
        byte[] sign = crypto.sign(text.getBytes(), privateKey);

        System.out.println(String.format("Digital signature in Base64: %1$s", VirgilBase64.encode(sign)));

        // Verify data with sign and public key
        boolean isValid = crypto.verify(text.getBytes(), sign, publicKey);

        System.out.println(String.format("Verification result is: %1$b", isValid));
    }

}