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(byte[] input) throws IllegalBlockSizeException, BadPaddingException

Source Link

Document

Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.

Usage

From source file:com.sysfore.pos.licensemanagement.LicenceManagementUtil.java

public static String encrypt(String strToEncrypt) {
    try {// w  w w  .j  a v  a2s.c  o  m
        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
        final SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey);

        final String encryptedString = Base64.encodeBase64String(cipher.doFinal(strToEncrypt.getBytes()));
        return encryptedString;
    } catch (Exception e) {
        log.error("Error while encrypting", e);
    }
    return null;

}

From source file:hh.learnj.test.license.test.rsacoder.RSACoder.java

/**
 * //from   ww  w  . ja  v a2s  .  c  om
 * 
 * @param data?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] encryptByPublicKey(byte[] data, byte[] key) throws Exception {

    // 
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ?
    // ???
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);
    // 
    PublicKey pubKey = keyFactory.generatePublic(x509KeySpec);

    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, pubKey);
    return cipher.doFinal(data);
}

From source file:hh.learnj.test.license.test.rsacoder.RSACoder.java

/**
 * ?//from w w w .  ja  v  a2s .co m
 * 
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] decryptByPrivateKey(byte[] data, byte[] key) throws Exception {
    // ??
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ??
    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.DECRYPT_MODE, privateKey);
    return cipher.doFinal(data);
}

From source file:com.example.license.RSAUtil.java

/**
 * ?/*from   w  ww  .j  a  v a  2s  . c  om*/
 * 
 * @param data
 *            ?
 * @param key
 *            
 * @return ??
 */
public static String encrypt(String data, String seed) throws Exception {
    KeyPair keyPair = generatorKeyPair(seed);
    // Cipher??
    Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM);
    // SecureRandom random = new SecureRandom();
    // ?Cipher?
    cipher.init(Cipher.ENCRYPT_MODE, keyPair.getPrivate());
    byte[] results = cipher.doFinal(data.getBytes());
    // http://tripledes.online-domain-tools.com/??
    for (int i = 0; i < results.length; i++) {
        System.out.print(results[i] + " ");
    }
    System.out.println();
    // ??Base64?
    return Base64.encodeBase64String(results);
}

From source file:hh.learnj.test.license.test.rsacoder.RSACoder.java

/**
 * ?/*from w  ww. j  a  v a 2 s .c  o m*/
 * 
 * @param data?
 * @param key
 *            
 * @return byte[] ?
 */
public static byte[] encryptByPrivateKey(byte[] data, byte[] key) throws Exception {

    // ??
    PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(key);
    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
    // ??
    PrivateKey privateKey = keyFactory.generatePrivate(pkcs8KeySpec);
    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
    cipher.init(Cipher.ENCRYPT_MODE, privateKey);
    return cipher.doFinal(data);
}

From source file:authentication.AES.java

public static String decrypt(String textoencriptado) throws Exception {
    Cipher decripta = Cipher.getInstance("AES/CBC/PKCS5Padding", "SunJCE");
    SecretKeySpec key = new SecretKeySpec(chaveencriptacao.getBytes("UTF-8"), "AES");
    decripta.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV.getBytes("UTF-8")));
    return new String(decripta.doFinal(Base64.decodeBase64(textoencriptado)), "UTF-8");
}

From source file:Main.java

/**
 * More flexible AES decrypt that doesn't encode
 *
 * @param key AES key typically 128, 192 or 256 bit
 * @param iv Initiation Vector/*www .j a  v  a2  s  .  c om*/
 * @param decodedCipherText in bytes (assumed it's already been decoded)
 * @return Decrypted message cipher text (not encoded)
 * @throws GeneralSecurityException if something goes wrong during encryption
 */
public static byte[] decrypt(final SecretKeySpec key, final byte[] iv, final byte[] decodedCipherText)
        throws GeneralSecurityException {
    final Cipher cipher = Cipher.getInstance(AES_MODE);
    IvParameterSpec ivSpec = new IvParameterSpec(iv);
    cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
    byte[] decryptedBytes = cipher.doFinal(decodedCipherText);

    log("decryptedBytes", decryptedBytes);

    return decryptedBytes;
}

From source file:com.cl.roadshow.crypto.AESCtr.java

/**
 * Private encryption method.//w  w  w.ja v  a2  s .com
 * 
 * @param keystring
 * @param message
 * @param bits
 * @return bytearray containing encrypted message
 * @throws Exception
 */
private static byte[] encrypt(String keystring, String message, int bits) throws Exception {
    byte[] encValue = null;
    SecureRandom random = new SecureRandom();
    byte[] nonceBytes = new byte[8];
    random.nextBytes(nonceBytes);
    IvParameterSpec nonce = new IvParameterSpec(Arrays.copyOf(nonceBytes, 16));

    Key key = generateKey(keystring, bits);
    Cipher c = Cipher.getInstance(ALGORITHM);
    c.init(Cipher.ENCRYPT_MODE, key, nonce);
    byte[] ciphertextWithoutNonce = c.doFinal(message.getBytes("UTF-8"));
    encValue = Arrays.copyOf(nonceBytes, nonceBytes.length + ciphertextWithoutNonce.length);
    for (int i = 0; i < ciphertextWithoutNonce.length; i++) {
        encValue[i + 8] = ciphertextWithoutNonce[i];
    }

    return encValue;
}

From source file:com.amazonaws.tvm.AESEncryption.java

public static byte[] encrypt(String clearText, String key, byte[] iv) throws Exception {
    Cipher cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM);
    AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
    params.init(new IvParameterSpec(iv));
    cipher.init(Cipher.ENCRYPT_MODE, getKey(key), params);
    return cipher.doFinal(clearText.getBytes());
}

From source file:com.ad.mediasharing.tvmclient.AESEncryption.java

public static byte[] decrypt(byte[] cipherBytes, String key, byte[] iv) throws Exception {
    Cipher cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM);
    AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
    params.init(new IvParameterSpec(iv));
    cipher.init(Cipher.DECRYPT_MODE, getKey(key), params);
    return cipher.doFinal(cipherBytes);
}