Example usage for java.security SecureRandom SecureRandom

Introduction

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

Prototype

public SecureRandom()

Source Link

Document

Constructs a secure random number generator (RNG) implementing the default random number algorithm.

Usage

From source file:Main.java

public static void main(String[] argv) throws Exception {
    SecureRandom sr = new SecureRandom();

    byte[] bytes = new byte[8];
    sr.nextBytes(bytes);//www.  ja va2  s .  c o m
    System.out.println(Arrays.toString(bytes));
}

From source file:MainClass.java

public static void main(String[] unused) {
    Random prng = new SecureRandom(); // self-seeding
    System.out.println(BigInteger.probablePrime(10, prng));
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    int bitLength = 512; // 512 bits
    SecureRandom rnd = new SecureRandom();
    int certainty = 90; // 1 - 1/2(90) certainty
    BigInteger mod = new BigInteger(bitLength, certainty, rnd);

    System.out.println(mod);/*w w w .  ja v  a 2s.  co m*/
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    int bitLength = 512; // 512 bits
    SecureRandom rnd = new SecureRandom();
    int certainty = 90; // 1 - 1/2(90) certainty
    System.out.println("BitLength : " + bitLength);
    BigInteger mod = new BigInteger(bitLength, certainty, rnd);
    BigInteger exponent = BigInteger.probablePrime(bitLength, rnd);
    BigInteger n = BigInteger.probablePrime(bitLength, rnd);

    BigInteger result = n.modPow(exponent, mod);
    System.out.println("Number ^ Exponent MOD Modulus = Result");
    System.out.println("Number");
    System.out.println(n);//from   w ww  .  j a va2s  . com
    System.out.println("Exponent");
    System.out.println(exponent);
    System.out.println("Modulus");
    System.out.println(mod);
    System.out.println("Result");
    System.out.println(result);
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {

    SecureRandom random = new SecureRandom();
    byte[] keyBytes = new byte[20];
    random.nextBytes(keyBytes);/*  w ww .  j ava2  s.  co m*/
    SecretKeySpec key = new SecretKeySpec(keyBytes, "HMACSHA1");

    System.out.println("Key:" + new BASE64Encoder().encode(key.getEncoded()));

    Mac mac = Mac.getInstance("HmacSHA1");
    mac.init(key);

    mac.update("test".getBytes("UTF8"));
    byte[] result = mac.doFinal();

    System.out.println("MAC: " + new BASE64Encoder().encode(result));
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {

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

}

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   w  w w  .  j  a va  2  s.co m*/

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

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  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:cn.lynx.emi.license.GenerateKeyPairs.java

public static void main(String[] args) throws NoSuchAlgorithmException {
    KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA");
    SecureRandom secrand = new SecureRandom();
    secrand.setSeed("cn.lynx.emi".getBytes());
    keygen.initialize(4096, secrand);//from  w ww  . j a  v a 2  s .  c o  m
    KeyPair keys = keygen.genKeyPair();

    PublicKey pubkey = keys.getPublic();
    PrivateKey prikey = keys.getPrivate();

    String myPubKey = Base64.encodeBase64String(pubkey.getEncoded());
    String myPriKey = Base64.encodeBase64String(prikey.getEncoded());
    System.out.println(prikey);
    System.out.println("pubKey=" + myPubKey);
    System.out.println("priKey=" + myPriKey);
}

From source file:MainClass.java

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

    byte[] input = "abc".getBytes();
    Cipher cipher = Cipher.getInstance("RSA/None/PKCS1Padding", "BC");
    SecureRandom random = new SecureRandom();
    KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA", "BC");

    generator.initialize(256, random);/*w  w  w.  j  av  a  2s  .  com*/

    KeyPair pair = generator.generateKeyPair();
    Key pubKey = pair.getPublic();
    Key privKey = pair.getPrivate();

    cipher.init(Cipher.ENCRYPT_MODE, pubKey, random);
    byte[] cipherText = cipher.doFinal(input);
    System.out.println("cipher: " + new String(cipherText));

    cipher.init(Cipher.DECRYPT_MODE, privKey);
    byte[] plainText = cipher.doFinal(cipherText);
    System.out.println("plain : " + new String(plainText));
}