Example usage for java.security KeyPair getPrivate

Introduction

In this page you can find the example usage for java.security KeyPair getPrivate.

Prototype

public PrivateKey getPrivate()

Source Link

Document

Returns a reference to the private key component of this key pair.

Usage

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 . java 2s  . c  o  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:Main.java

public static void main(String[] args) throws Exception {
    String algorithm = "";
    KeyPair keyPair = KeyPairGenerator.getInstance(algorithm).generateKeyPair();

    System.out.println(keyPair.getPublic());
    System.out.println(keyPair.getPrivate());

}

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);//from  ww w  . j a  v a2  s . c  om

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

From source file:KeyTools.java

public static void main(String[] rgstring) {
    try {/*w w  w . j ava 2 s . com*/
        File filePublic = new File(rgstring[0]);
        File filePrivate = new File(rgstring[1]);

        KeyPairGenerator keypairgenerator = KeyPairGenerator.getInstance("DSA");

        keypairgenerator.initialize(1024, new SecureRandom());

        KeyPair keypair = keypairgenerator.generateKeyPair();

        writeToFile(keypair.getPublic(), filePublic);
        writeToFile(keypair.getPrivate(), filePrivate);
    } catch (Exception ex) {
        ex.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("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);/*from   ww  w . j a  v  a  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:br.edu.ufcg.lsd.commune.network.signature.Util.java

public static void main(String[] args) {
    KeyPair keyPair = generateKeyPair();
    System.out.println(encodeArrayToBase64String(keyPair.getPrivate().getEncoded()));
    System.out.println(encodeArrayToBase64String(keyPair.getPublic().getEncoded()));
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
    kpg.initialize(1024);/*  ww w. ja v a 2 s . c om*/
    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("SHA256withRSA", "BC");
    signature.initSign(keyPair.getPrivate());

    byte[] message = "abc".getBytes();
    signature.update(message);/*from  w  w w  .ja v  a  2 s .  c  o  m*/

    byte[] sigBytes = signature.sign();
    Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", "BC");
    cipher.init(Cipher.DECRYPT_MODE, keyPair.getPublic());

    byte[] decSig = cipher.doFinal(sigBytes);
    ASN1InputStream aIn = new ASN1InputStream(decSig);
    ASN1Sequence seq = (ASN1Sequence) aIn.readObject();

    System.out.println(ASN1Dump.dumpAsString(seq));

    MessageDigest hash = MessageDigest.getInstance("SHA-256", "BC");
    hash.update(message);

    ASN1OctetString sigHash = (ASN1OctetString) seq.getObjectAt(1);
    System.out.println(MessageDigest.isEqual(hash.digest(), sigHash.getOctets()));
}

From source file:MainClass.java

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

    KeyPair keyPair = generateKeyPair(999);

    byte[] data = { 65, 66, 67, 68, 69, 70, 71, 72, 73, 74 };
    byte[] digitalSignature = signData(data, keyPair.getPrivate());

    boolean verified;

    verified = verifySig(data, keyPair.getPublic(), digitalSignature);
    System.out.println(verified);

    keyPair = generateKeyPair(888);//from  w w w  .  ja v  a 2 s.  c  o m
    verified = verifySig(data, keyPair.getPublic(), digitalSignature);
    System.out.println(verified);

}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    String s = "F488FD584E49DBCD20B49DE49107366B336C380D451D0F7C88"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111"
            + "11111111111111111111111111111111111111111111111111" + "2F78C7";
    BigInteger base = BigInteger.valueOf(2);
    BigInteger modulus = new BigInteger(s, 16);
    DHParameterSpec skipParameterSpec = new DHParameterSpec(modulus, base);

    KeyPairGenerator kpg1 = KeyPairGenerator.getInstance("DH");
    kpg1.initialize(skipParameterSpec);/*from ww  w . j a v  a2s .c o  m*/
    KeyPair kp1 = kpg1.generateKeyPair();

    KeyAgreement ka1 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey1 = (DHPrivateKey) kp1.getPrivate();
    DHPublicKey publicKey1 = (DHPublicKey) kp1.getPublic();
    ka1.init(privateKey1);
    System.out.println("1 is using " + publicKey1.getY() + " for its public key");
    KeyPairGenerator kpg2 = KeyPairGenerator.getInstance("DH");
    kpg2.initialize(skipParameterSpec);
    KeyPair kp2 = kpg2.generateKeyPair();

    KeyAgreement ka2 = KeyAgreement.getInstance("DH");
    DHPrivateKey privateKey2 = (DHPrivateKey) kp2.getPrivate();
    DHPublicKey publicKey2 = (DHPublicKey) kp2.getPublic();
    ka2.init(privateKey2);
    System.out.println("2 is using " + publicKey2.getY() + " for its public key");
    ka1.doPhase(publicKey2, true);
    byte[] sharedKey1 = ka1.generateSecret();
    System.out.println("1 is using " + new BigInteger(1, sharedKey1) + " for its shared key");

    ka2.doPhase(publicKey1, true);
    byte[] sharedKey2 = ka2.generateSecret();
    System.out.println("2 is using " + new BigInteger(1, sharedKey2) + " for its shared key");
}