Example usage for java.security MessageDigest digest

Introduction

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

Prototype

public byte[] digest()

Source Link

Document

Completes the hash computation by performing final operations such as padding.

Usage

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    MessageDigest m = MessageDigest.getInstance("MD5");
    m.update("test".getBytes());
    byte s[] = m.digest();
    String result = "";
    for (int i = 0; i < s.length; i++) {
        result += Integer.toHexString((0x000000ff & s[i]) | 0xffffff00).substring(6);
    }//from   w w w  .  j  a  va  2 s  . c  o  m
    System.out.println(result);
}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    FileInputStream fis = new FileInputStream("test");
    ObjectInputStream ois = new ObjectInputStream(fis);
    Object o = ois.readObject();//from ww w  .jav a  2  s  .  co m
    if (!(o instanceof String)) {
        System.out.println("Unexpected data in file");
        System.exit(-1);
    }
    String data = (String) o;
    System.out.println("Got message " + data);
    o = ois.readObject();
    if (!(o instanceof byte[])) {
        System.out.println("Unexpected data in file");
        System.exit(-1);
    }
    byte origDigest[] = (byte[]) o;
    MessageDigest md = MessageDigest.getInstance("SHA");
    md.update(data.getBytes());
    if (MessageDigest.isEqual(md.digest(), origDigest))
        System.out.println("Message is valid");
    else
        System.out.println("Message was corrupted");
}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    FileInputStream fis = new FileInputStream("test");
    ObjectInputStream ois = new ObjectInputStream(fis);
    Object o = ois.readObject();//  w  w  w .j  a  v  a2  s.  c  o  m
    if (!(o instanceof String)) {
        System.out.println("Unexpected data in file");
        System.exit(-1);
    }
    String data = (String) o;
    System.out.println("Got message " + data);
    o = ois.readObject();
    if (!(o instanceof byte[])) {
        System.out.println("Unexpected data in file");
        System.exit(-1);
    }
    byte origDigest[] = (byte[]) o;
    byte pass[] = "aaa".getBytes();
    byte buf[] = data.getBytes();
    MessageDigest md = MessageDigest.getInstance("SHA");
    md.update(pass);
    md.update(buf);
    byte digest1[] = md.digest();
    md.update(pass);
    md.update(digest1);
    System.out.println(MessageDigest.isEqual(md.digest(), origDigest));
}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
    MessageDigest sha = MessageDigest.getInstance("SHA-1");
    byte[] data1 = { 65, 66, 67, 68, 69 };

    sha.update(data1);/*from   w  w  w .jav  a2 s .  c  om*/
    byte[] msgDigest = sha.digest();

    System.out.println("--- Message Digest ---");
    for (int i = 0; i < msgDigest.length; i++) {
        System.out.print(msgDigest[i] + " ");
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    String password = "secret";
    String algorithm = "SHA";

    byte[] plainText = password.getBytes();

    MessageDigest md = MessageDigest.getInstance(algorithm);

    md.reset();/*ww  w  .  j a v  a  2s. co  m*/
    md.update(plainText);
    byte[] encodedPassword = md.digest();

    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < encodedPassword.length; i++) {
        if ((encodedPassword[i] & 0xff) < 0x10) {
            sb.append("0");
        }
        sb.append(Long.toString(encodedPassword[i] & 0xff, 16));
    }
    System.out.println("Plain    : " + password);
    System.out.println("Encrypted: " + sb.toString());
}

From source file:algoritmorsa_md5.MD5.java

/**
 * @param args the command line arguments
 *//* ww  w  . ja  v  a  2  s . com*/
public static void main(String[] args) throws NoSuchAlgorithmException {
    // TODO code application logic here

    MessageDigest md = MessageDigest.getInstance(MessageDigestAlgorithms.MD5);
    md.update("yesica".getBytes());
    byte[] digest = md.digest();

    for (byte b : digest) {
        System.out.println(Integer.toHexString(0xFF & b));
    }
    System.out.println();
    byte[] encoded = Base64.encodeBase64(digest);
    System.out.println(new String(encoded));
}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    MessageDigest m = MessageDigest.getInstance("MD5");
    FileInputStream fin = new FileInputStream(args[0]);
    DigestInputStream din = new DigestInputStream(fin, m);
    while (din.read() != -1)
        ;// w  w w.  ja  v  a 2s .  co m

    byte s[] = m.digest();
    for (int i = 0; i < s.length; i++) {
        System.out.print(Integer.toHexString((0x000000ff & s[i]) | 0xffffff00).substring(6));
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    URL u = new URL("http://www.google.com");
    InputStream in = u.openStream();
    MessageDigest sha = MessageDigest.getInstance("SHA");
    byte[] data = new byte[1024];
    int bytesRead = -1;
    while ((bytesRead = in.read(data)) >= 0) {
        sha.update(data, 0, bytesRead);/*from  w w w.j a v  a2  s  . c  om*/
    }
    byte[] result = sha.digest();
    System.out.println(Arrays.toString(result));
    System.out.println(new BigInteger(result));
}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    FileOutputStream fos = new FileOutputStream("test");
    MessageDigest md = MessageDigest.getInstance("SHA");
    ObjectOutputStream oos = new ObjectOutputStream(fos);
    String data = "thee";
    byte buf[] = data.getBytes();
    md.update(buf);//from  ww w .j av  a  2  s . co  m
    oos.writeObject(data);
    oos.writeObject(md.digest());
}

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);/* ww w  .j a v  a2s .  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()));
}