Example usage for javax.crypto Cipher doFinal

Introduction

In this page you can find the example usage for javax.crypto Cipher doFinal.

Prototype

public final byte[] doFinal() throws IllegalBlockSizeException, BadPaddingException 

Source Link

Document

Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized.

Usage

From source file:DataStudioCrak.java

public static void main(String[] args) {
    String company = "labthink";
    byte[] companyByteArray = company.getBytes();
    byte[] companyByteIntArray = intToByteArray(compute(companyByteArray, companyByteArray.length));
    // byte[] ff = "zhulixia".getBytes();
    byte[] snByte = new byte[32];
    byte[] byte1 = new byte[] { 7, 1 };
    byte[] byte2 = "zhaodapengpojiehahahahahaha".getBytes();
    byte[] byte3 = new byte[] { 127 };
    byte[] snMain = new byte[24];
    System.arraycopy(byte1, 0, snMain, 0, 2);
    System.arraycopy(byte2, 0, snMain, 2, 17);
    System.arraycopy(companyByteIntArray, 0, snMain, 19, 4);
    System.arraycopy(byte3, 0, snMain, 23, 1);
    //  1 - single license,2 - site license ,3 educational license
    snMain[2] = (byte) 1;
    int intSn = compute(snMain, snMain.length);
    System.out.println("intSn=" + intSn);
    byte[] key1 = "dddd".getBytes();
    byte[] key2 = intToByteArray(intSn);
    byte[] key = new byte[8];
    System.arraycopy(key1, 0, key, 0, 4);
    System.arraycopy(key2, 0, key, 4, 4);

    byte encodedSnMain[] = new byte[snMain.length];
    try {//from  w ww  .  j  a  v a2s  .  c om
        DESKeySpec deskeyspec = new DESKeySpec(key);
        javax.crypto.SecretKey secretkey = SecretKeyFactory.getInstance("DES").generateSecret(deskeyspec);
        Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, secretkey);
        cipher.update(snMain, 0, snMain.length, encodedSnMain);
        cipher.doFinal();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    System.arraycopy(key1, 0, snByte, 0, 4);
    System.arraycopy(key2, 0, snByte, 28, 4);
    System.arraycopy(encodedSnMain, 0, snByte, 4, 24);
    char[] snCharArray = Hex.encodeHex(snByte);
    String sn = new String(snCharArray);
    System.out.println("sn=" + sn);
}

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From source file:net.labthink.run.DataStudioCrak.java

public static void main(String[] args) {
    String company = "Labthink";
    byte[] companyByteArray = company.getBytes();
    byte[] companyByteIntArray = intToByteArray(compute(companyByteArray, companyByteArray.length));
    // byte[] ff = "zhulixia".getBytes();
    byte[] snByte = new byte[32];
    byte[] byte1 = new byte[] { 7, 1 };
    byte[] byte2 = "zhaodapengpojiehahahahahaha".getBytes();
    byte[] byte3 = new byte[] { 127 };
    byte[] snMain = new byte[24];
    System.arraycopy(byte1, 0, snMain, 0, 2);
    System.arraycopy(byte2, 0, snMain, 2, 17);
    System.arraycopy(companyByteIntArray, 0, snMain, 19, 4);
    System.arraycopy(byte3, 0, snMain, 23, 1);
    //  1 - single license,2 - site license ,3 educational license
    snMain[2] = (byte) 1;
    int intSn = compute(snMain, snMain.length);
    System.out.println("intSn=" + intSn);
    byte[] key1 = "dddd".getBytes();
    byte[] key2 = intToByteArray(intSn);
    byte[] key = new byte[8];
    System.arraycopy(key1, 0, key, 0, 4);
    System.arraycopy(key2, 0, key, 4, 4);

    byte encodedSnMain[] = new byte[snMain.length];
    try {//from   w ww  .  j a v a  2s .  co m
        DESKeySpec deskeyspec = new DESKeySpec(key);
        javax.crypto.SecretKey secretkey = SecretKeyFactory.getInstance("DES").generateSecret(deskeyspec);
        Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
        cipher.init(Cipher.ENCRYPT_MODE, secretkey);
        cipher.update(snMain, 0, snMain.length, encodedSnMain);
        cipher.doFinal();
    } catch (Exception ex) {
        ex.printStackTrace();
    }
    System.arraycopy(key1, 0, snByte, 0, 4);
    System.arraycopy(key2, 0, snByte, 28, 4);
    System.arraycopy(encodedSnMain, 0, snByte, 4, 24);
    char[] snCharArray = Hex.encodeHex(snByte);
    String sn = new String(snCharArray);
    System.out.println("sn=" + sn);
}

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From source file:hh.learnj.test.license.test.rsa.RSATest.java

/**
 * /*from  w w  w .ja  v a2 s . c  o  m*/
 * 
 * @param target
 * @throws Exception
 */
static void decryptionByPublicKey(String target) throws Exception {
    PublicKey publicKey = getPublicKey();
    Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, publicKey);
    cipher.update(decodeBase64(target));
    String source = new String(cipher.doFinal(), "UTF-8");
    System.out.println("??\r\n" + source);
}

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From source file:hh.learnj.test.license.test.rsa.RSATest.java

/**
 * ?/* w w  w .java  2  s  .c  o m*/
 * 
 * @param target
 * @throws Exception
 */
static void decryptionByPrivateKey(String target) throws Exception {
    PrivateKey privateKey = getPrivateKey();
    Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, privateKey);
    cipher.update(decodeBase64(target));
    String source = new String(cipher.doFinal(), "UTF-8");
    System.out.println("???\r\n" + source);
}

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From source file:hh.learnj.test.license.test.rsa.RSATest.java

/**
 * /*from ww  w .  j  a v  a2  s  .c  o m*/
 * 
 * @param data
 * @return
 * @throws Exception
 */
static String encryptionByPublicKey(String source) throws Exception {
    PublicKey publicKey = getPublicKey();
    Cipher cipher = Cipher.getInstance(publicKey.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, publicKey);
    cipher.update(source.getBytes("UTF-8"));
    String target = encodeBase64(cipher.doFinal());
    System.out.println("??\r\n" + target);
    return target;
}

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From source file:hh.learnj.test.license.test.rsa.RSATest.java

/**
 * ?/*from w  w w .  j  a  va 2 s  .co m*/
 * 
 * @param data
 * @return
 * @throws Exception
 */
static String encryptionByPrivateKey(String source) throws Exception {
    PrivateKey privateKey = getPrivateKey();
    Cipher cipher = Cipher.getInstance(privateKey.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, privateKey);
    cipher.update(source.getBytes("UTF-8"));
    String target = encodeBase64(cipher.doFinal());
    System.out.println("???\r\n" + target);
    return target;
}

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From source file:cloudeventbus.pki.CertificateUtils.java

public static byte[] signChallenge(PrivateKey key, byte[] challenge, byte[] salt) {
    try {//  w w w  .  j a  va  2 s .  co  m
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, key);
        cipher.update(challenge);
        cipher.update(salt);
        return cipher.doFinal();
    } catch (GeneralSecurityException e) {
        throw new CertificateSecurityException(e);
    }
}

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From source file:TripleDES.java

/**
 * Use the specified TripleDES key to decrypt bytes ready from the input
 * stream and write them to the output stream. This method uses uses Cipher
 * directly to show how it can be done without CipherInputStream and
 * CipherOutputStream.//from   w  w w  .j  a  va2s  .  c o m
 */
public static void decrypt(SecretKey key, InputStream in, OutputStream out)
        throws NoSuchAlgorithmException, InvalidKeyException, IOException, IllegalBlockSizeException,
        NoSuchPaddingException, BadPaddingException {
    // Create and initialize the decryption engine
    Cipher cipher = Cipher.getInstance("DESede");
    cipher.init(Cipher.DECRYPT_MODE, key);

    // Read bytes, decrypt, and write them out.
    byte[] buffer = new byte[2048];
    int bytesRead;
    while ((bytesRead = in.read(buffer)) != -1) {
        out.write(cipher.update(buffer, 0, bytesRead));
    }

    // Write out the final bunch of decrypted bytes
    out.write(cipher.doFinal());
    out.flush();
}

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From source file:com.hernandez.rey.crypto.TripleDES.java

/**
 * Use the specified TripleDES key to decrypt bytes ready from the input stream and write them to the output stream.
 * This method uses uses Cipher directly to show how it can be done without CipherInputStream and CipherOutputStream.
 * //from   w w  w .  ja v  a 2 s .c o  m
 * @param key the key for decryption
 * @param in
 * @param out
 * @throws NoSuchAlgorithmException
 * @throws InvalidKeyException
 * @throws IOException
 * @throws IllegalBlockSizeException
 * @throws NoSuchPaddingException
 * @throws BadPaddingException
 */
public static void decrypt(final SecretKey key, final InputStream in, final OutputStream out)
        throws NoSuchAlgorithmException, InvalidKeyException, IOException, IllegalBlockSizeException,
        NoSuchPaddingException, BadPaddingException {
    // Create and initialize the decryption engine
    final Cipher cipher = Cipher.getInstance("DESede");
    cipher.init(Cipher.DECRYPT_MODE, key);

    // Read bytes, decrypt, and write them out.
    final byte[] buffer = new byte[2048];
    int bytesRead;
    while ((bytesRead = in.read(buffer)) != -1) {
        out.write(cipher.update(buffer, 0, bytesRead));
    }

    // Write out the final bunch of decrypted bytes
    out.write(cipher.doFinal());
    out.flush();
}

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