Example usage for java.security Signature initVerify

Introduction

In this page you can find the example usage for java.security Signature initVerify.

Prototype

public final void initVerify(Certificate certificate) throws InvalidKeyException 

Source Link

Document

Initializes this object for verification, using the public key from the given certificate.

Usage

From source file:SignatureTest.java

public static void main(String[] args) {
    try {/*from  www .  j  av  a  2  s.  com*/
        if (args[0].equals("-genkeypair")) {
            KeyPairGenerator pairgen = KeyPairGenerator.getInstance("DSA");
            SecureRandom random = new SecureRandom();
            pairgen.initialize(KEYSIZE, random);
            KeyPair keyPair = pairgen.generateKeyPair();
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(args[1]));
            out.writeObject(keyPair.getPublic());
            out.close();
            out = new ObjectOutputStream(new FileOutputStream(args[2]));
            out.writeObject(keyPair.getPrivate());
            out.close();
        } else if (args[0].equals("-sign")) {
            ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[3]));
            PrivateKey privkey = (PrivateKey) keyIn.readObject();
            keyIn.close();

            Signature signalg = Signature.getInstance("DSA");
            signalg.initSign(privkey);

            File infile = new File(args[1]);
            InputStream in = new FileInputStream(infile);
            int length = (int) infile.length();
            byte[] message = new byte[length];
            in.read(message, 0, length);
            in.close();

            signalg.update(message);
            byte[] signature = signalg.sign();

            DataOutputStream out = new DataOutputStream(new FileOutputStream(args[2]));
            int signlength = signature.length;
            out.writeInt(signlength);
            out.write(signature, 0, signlength);
            out.write(message, 0, length);
            out.close();
        } else if (args[0].equals("-verify")) {
            ObjectInputStream keyIn = new ObjectInputStream(new FileInputStream(args[2]));
            PublicKey pubkey = (PublicKey) keyIn.readObject();
            keyIn.close();

            Signature verifyalg = Signature.getInstance("DSA");
            verifyalg.initVerify(pubkey);

            File infile = new File(args[1]);
            DataInputStream in = new DataInputStream(new FileInputStream(infile));
            int signlength = in.readInt();
            byte[] signature = new byte[signlength];
            in.read(signature, 0, signlength);

            int length = (int) infile.length() - signlength - 4;
            byte[] message = new byte[length];
            in.read(message, 0, length);
            in.close();

            verifyalg.update(message);
            if (!verifyalg.verify(signature))
                System.out.print("not ");
            System.out.println("verified");
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

---

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA", "BC");

    keyGen.initialize(512, new SecureRandom());

    KeyPair keyPair = keyGen.generateKeyPair();
    Signature signature = Signature.getInstance("DSA", "BC");

    signature.initSign(keyPair.getPrivate(), new SecureRandom());
    byte[] message = "abc".getBytes();
    signature.update(message);//  www  .j ava2s  .  c  o m

    byte[] sigBytes = signature.sign();
    signature.initVerify(keyPair.getPublic());
    signature.update(message);
    System.out.println(signature.verify(sigBytes));
}

---

From source file:Main.java

public static void main(String[] args) throws Exception {
    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
    kpg.initialize(1024);//from www . j  a  v  a 2s  .  c o  m
    KeyPair keyPair = kpg.genKeyPair();

    byte[] data = "test".getBytes("UTF8");

    Signature sig = Signature.getInstance("MD5WithRSA");
    sig.initSign(keyPair.getPrivate());
    sig.update(data);
    byte[] signatureBytes = sig.sign();
    System.out.println("Singature:" + new BASE64Encoder().encode(signatureBytes));

    sig.initVerify(keyPair.getPublic());
    sig.update(data);

    System.out.println(sig.verify(signatureBytes));
}

---

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());

    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA", "BC");

    keyGen.initialize(512, new SecureRandom());

    KeyPair keyPair = keyGen.generateKeyPair();
    Signature signature = Signature.getInstance("SHA1withRSA", "BC");

    signature.initSign(keyPair.getPrivate(), new SecureRandom());

    byte[] message = "abc".getBytes();
    signature.update(message);/*w w  w.  j  ava 2 s  .  c  o m*/

    byte[] sigBytes = signature.sign();
    signature.initVerify(keyPair.getPublic());
    signature.update(message);
    System.out.println(signature.verify(sigBytes));
}

---

From source file:Main.java

public static void main(String[] argv) throws Exception {
    KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
    keyGen.initialize(1024);//from  w w  w . j a  v  a 2 s  .co m
    KeyPair keypair = keyGen.genKeyPair();
    DSAPrivateKey privateKey = (DSAPrivateKey) keypair.getPrivate();
    DSAPublicKey publicKey = (DSAPublicKey) keypair.getPublic();

    DSAParams dsaParams = privateKey.getParams();
    BigInteger p = dsaParams.getP();
    BigInteger q = dsaParams.getQ();
    BigInteger g = dsaParams.getG();
    BigInteger x = privateKey.getX();
    BigInteger y = publicKey.getY();

    KeyFactory keyFactory = KeyFactory.getInstance("DSA");
    KeySpec publicKeySpec = new DSAPublicKeySpec(y, p, q, g);
    PublicKey publicKey1 = keyFactory.generatePublic(publicKeySpec);
    KeySpec privateKeySpec = new DSAPrivateKeySpec(x, p, q, g);
    PrivateKey privateKey1 = keyFactory.generatePrivate(privateKeySpec);

    byte[] buffer = new byte[1024];

    Signature sig = Signature.getInstance(privateKey1.getAlgorithm());
    sig.initSign(privateKey1);
    sig.update(buffer, 0, buffer.length);

    byte[] signature = sig.sign();

    sig = Signature.getInstance(publicKey1.getAlgorithm());
    sig.initVerify(publicKey1);
    sig.update(buffer, 0, buffer.length);
    sig.verify(signature);

}

---

From source file:Version2LicenseDecoder.java

public static void main(String[] args) throws IOException, Exception {
    new Version2LicenseDecoder();
    String lll = "AAABDA0ODAoPeNptUEtPg0AQvu+vIPG8ZsEKlmQPFda6DVAENB68rHTUbdotmQVi/71QTHykh5lM5nvMl7m4Q+2sOuOwwGHz8PomnDFnmVaOx9wrEoOtUTetPhi+ksXiJXREr3adGjckQjgNsWqBj3zKfMoCstWoLhNdg7EgNvqkFlkliryQpSA/DrzFDv7Qq2MDmdoDj9ZpKopILpIJV3Wre5gEu4n7BGhHE4+kSpsWjDI1iM9G4/FXomBMtMZ3ZbSdjm4PWpnN0M1knXX7V8D126MdDDl1SQnYA8qY31b5A5WRLKgfP0d0du8uSSkyPhRNPJ/5njcn38kHeiLjc8j5SHmH9Yey8P95XxVof60wKwITfDIxHZPgo323OEKd2FJ4BXvU7wIUIbLvXQNrkIAf4AL2Aeu4ZBRbTOA=X02dl";
    String lls = "AAABckRlc2NyaXB0aW9uPUpJUkE6IENvbW1lcmNpYWwKQ3JlYXRpb25EYXRlPTIwMTMtMDYtMDcKamlyYS5MaWNlbnNlRWRpdGlvbj1FTlRFUlBSSVNFCkV2YWx1YXRpb249ZmFsc2UKamlyYS5MaWNlbnNlVHlwZU5hbWU9Q09NTUVSQ0lBTApqaXJhLmFjdGl2ZT10cnVlCmxpY2Vuc2VWZXJzaW9uPTIKTWFpbnRlbmFuY2VFeHBpcnlEYXRlPTIwOTktMDYtMDcKT3JnYW5pc2F0aW9uPWpvaWFuZGpvaW4KU0VOPVNFTi1MMjYwNjIyOQpTZXJ2ZXJJRD1CVFBRLUlDSVItNkRYQy00SDFHCmppcmEuTnVtYmVyT2ZVc2Vycz0tMQpMaWNlbnNlSUQ9TElEU0VOLUwyNjA2MjI5CkxpY2Vuc2VFeHBpcnlEYXRlPTIwOTktMDYtMDcKUHVyY2hhc2VEYXRlPTIwMTMtMDYtMDc=X02g4";
    //      String sll = "Description=JIRA:Commercial\nCreationDate=2013-06-07\njira.LicenseEdition=ENTERPRISE\nEvaluation=false\njira.LicenseTypeName=COMMERCIAL\njira.active=true\nlicenseVersion=2\nMaintenanceExpiryDate=2099-06-07\nOrganisation=joiandjoin\nSEN=SEN-L2606229\nServerID=BTPQ-ICIR-6DXC-4H1G\njira.NumberOfUsers=-1\nLicenseID=LIDSEN-L2606229\nLicenseExpiryDate=2099-06-07\nPurchaseDate=2013-06-07";
    //      String sll = "com.allenta.jira.plugins.gitlab.gitlab-listener.enterprise=true\nDescription=GitLab Listener\\: Evaluation\nNumberOfUsers=-1\nCreationDate=2015-12-29\nContactEMail=xwturing@gmail.com\nEvaluation=true\ncom.allenta.jira.plugins.gitlab.gitlab-listener.Starter=false\nlicenseVersion=2\nMaintenanceExpiryDate=2099-01-27\nOrganisation=Evaluation license\nSEN=SEN-L7030895\ncom.allenta.jira.plugins.gitlab.gitlab-listener.active=true\nLicenseExpiryDate=2099-01-27\nLicenseTypeName=COMMERCIAL\nPurchaseDate=2015-12-29\n";
    //      String sll = "jira.product.jira-servicedesk.active=true\njira.product.jira-servicedesk.Starter=false\nNumberOfUsers=-1\nPurchaseDate=2016-01-05\ncom.atlassian.servicedesk.active=true\nLicenseTypeName=COMMERCIAL\nLicenseExpiryDate=2099-02-03\nContactEMail=xwturing@gmail.com\nServerID=BWGW-FKTG-N1UQ-PNHH\ncom.atlassian.servicedesk.LicenseTypeName=COMMERCIAL\njira.product.jira-servicedesk.NumberOfUsers=-1\nMaintenanceExpiryDate=2099-02-03\ncom.atlassian.servicedesk.enterprise=true\nLicenseID=LIDSEN-L7059162\nSEN=SEN-L7059162\nOrganisation=Evaluation license\nCreationDate=2016-01-05\ncom.atlassian.servicedesk.numRoleCount=-1\nlicenseVersion=2\nDescription=JIRA Service Desk (Server)\\: Evaluation\nEvaluation=true";
    String sll = "NumberOfUsers=-1\n" + "jira.product.jira-core.NumberOfUsers=-1\n" + "jira.NumberOfUsers=-1\n"
            + "PurchaseDate=2016-02-20\n" + "LicenseTypeName=COMMERCIAL\n" + "LicenseExpiryDate=2099-03-21\n"
            + "ContactEMail=xwturing@gmail.com\n" + "ServerID=BVDW-Q5Y0-CRXH-AI3I\n"
            + "jira.product.jira-core.Starter=false\n" + "jira.LicenseEdition=ENTERPRISE\n"
            + "jira.product.jira-core.active=true\n" + "MaintenanceExpiryDate=2099-03-21\n"
            + "LicenseID=LIDSEN-L7336401\n" + "SEN=SEN-L7336401\n" + "Organisation=Evaluation license\n"
            + "CreationDate=2016-02-20\n" + "licenseVersion=2\n"
            + "Description=JIRA Core (Server)\\: Evaluation\n" + "jira.active=true\n"
            + "jira.LicenseTypeName=COMMERCIAL\n" + "Evaluation=true";

    byte[] allData = sll.getBytes();
    Signature signature = Signature.getInstance("SHA1withDSA");
    signature.initVerify(PUBLIC_KEY);
    signature.update(allData);/*from  w  w w  . j  a  va  2s  .  co m*/
    ByteArrayInputStream in = new ByteArrayInputStream(allData);
    DataInputStream dIn = new DataInputStream(in);
    int textLength = dIn.readInt();
    byte[] licenseText = new byte[textLength];
    dIn.read(licenseText);
    byte[] hash = new byte[dIn.available()];
    dIn.read(hash);
    String result = packLicense(allData, hash);
    System.out.println(result);
}

---

From source file:testSig.java

public static void main(String[] args) {

    /* Test generating and verifying a DSA signature */

    try {//from w  w w  .ja v a2 s  .  c  o m

        /* generate a key pair */

        KeyPairGenerator keyGen = KeyPairGenerator.getInstance("DSA");
        keyGen.initialize(1024, new SecureRandom());
        KeyPair pair = keyGen.generateKeyPair();

        /*
         * create a Signature object to use for signing and verifying
         */

        Signature dsa = Signature.getInstance("SHA/DSA");

        /* initialize the Signature object for signing */

        PrivateKey priv = pair.getPrivate();

        dsa.initSign(priv);

        /* Update and sign the data */

        FileInputStream fis = new FileInputStream(args[0]);
        byte b;
        while (fis.available() != 0) {
            b = (byte) fis.read();
            dsa.update(b);
        }
        ;

        fis.close();

        /*
         * Now that all the data to be signed has been read in, sign it
         */
        byte[] sig = dsa.sign();

        /* Verify the signature */

        /* Initialize the Signature object for verification */
        PublicKey pub = pair.getPublic();
        dsa.initVerify(pub);

        /* Update and verify the data */

        fis = new FileInputStream(args[0]);
        while (fis.available() != 0) {
            b = (byte) fis.read();
            dsa.update(b);
        }
        ;

        fis.close();

        boolean verifies = dsa.verify(sig);

        System.out.println("signature verifies: " + verifies);

    } catch (Exception e) {
        System.err.println("Caught exception " + e.toString());
    }

}

---

From source file:MainClass.java

static void performVerification(String s, String alg, byte[] signature, PublicKey publicKey) throws Exception {
    Signature sign = Signature.getInstance(alg);
    sign.initVerify(publicKey);
    sign.update(s.getBytes());/*from w ww  . ja  v  a  2  s  .co m*/
    System.out.println(sign.verify(signature));
}

---

From source file:MainClass.java

public static boolean verifySig(byte[] data, PublicKey key, byte[] sig) throws Exception {
    Signature signer = Signature.getInstance("SHA1withDSA");
    signer.initVerify(key);
    signer.update(data);/*w  w w.j  a  v  a  2  s .  c o m*/
    return (signer.verify(sig));

}

---

From source file:com.java.demo.RsaDemo.java

public static boolean Verify(String str, byte[] enstr) {
    try {//  w  w  w. j a v a 2 s  .com
        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rSAPublicKey.getEncoded());
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
        Signature signature = Signature.getInstance("MD5withRSA");
        signature.initVerify(publicKey);
        signature.update(str.getBytes());
        boolean result = signature.verify(enstr);
        return result;
    } catch (Exception e) {
        System.out.println("com.Java.Demo.RsaDemo.Verify()" + e.getMessage());
        return false;
    }
}

---

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