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.aimluck.eip.util.ALCellularUtils.java

/**
 * Triple DES ?????/*from w  w w. j av a  2s .  c om*/
 * 
 * @param plain
 *          ?
 * @return ?
 * @throws Exception
 *           ??
 */
@SuppressWarnings("unused")
private static String decrypt3Des(String key, String plain) throws Exception {
    String KEY_CRPTY_ALGORITHM = "DESede";

    // 24????
    byte[] tripleDesKeyData = new byte[24];
    byte[] kyebyte = key.getBytes();
    int len = kyebyte.length;
    for (int i = 0; i < len; i++) {
        tripleDesKeyData[i] = kyebyte[i];
    }
    SecretKey secretKey = new SecretKeySpec(tripleDesKeyData, KEY_CRPTY_ALGORITHM);

    Cipher cipher = Cipher.getInstance(KEY_CRPTY_ALGORITHM);
    cipher.init(Cipher.DECRYPT_MODE, secretKey);

    Base64 decoder = new Base64();
    byte[] decParam = decoder.decode(plain.trim().getBytes());

    return String.valueOf(cipher.doFinal(decParam));
}

From source file:Main.java

public static byte[] encryptMsg(String msg, RSAPublicKeySpec pubKeySpec) {
    if (msg != null && pubKeySpec != null && !msg.isEmpty()) {
        try {/*from w ww  . ja  v  a  2  s.  c o m*/
            Log.w(TAG, "msg is: " + msg + " with length " + msg.length());
            KeyFactory fact = KeyFactory.getInstance("RSA");

            PublicKey pubKey = fact.generatePublic(pubKeySpec);

            // TODO encrypt the message and send it
            // Cipher cipher = Cipher.getInstance("RSA/None/NoPadding");
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
            // Cipher cipher =
            // Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding",
            // "BC");
            cipher.init(Cipher.ENCRYPT_MODE, pubKey);
            Log.d(TAG, "cipher block size is " + cipher.getBlockSize());
            byte[] msgByteArray = msg.getBytes();
            byte[] cipherData = new byte[cipher.getOutputSize(msgByteArray.length)];
            cipherData = cipher.doFinal(msgByteArray);
            Log.d(TAG, "output size is " + cipher.getOutputSize(msgByteArray.length));
            Log.d(TAG, "is the measurement already broken into chunks here? " + (new String(cipherData)));
            return cipherData;

        } catch (NoSuchAlgorithmException e) {
            Log.e(TAG, "RSA algorithm not available", e);
        } catch (InvalidKeySpecException e) {
            Log.e(TAG, "", e);
        } catch (NoSuchPaddingException e) {
            Log.e(TAG, "", e);
        } catch (InvalidKeyException e) {
            Log.e(TAG, "", e);
        } catch (BadPaddingException e) {
            Log.e(TAG, "", e);
        } catch (IllegalBlockSizeException e) {
            Log.e(TAG, "", e);
        } catch (Exception e) {
            Log.e(TAG, "", e);
        } /*
           * catch (NoSuchProviderException e) { Log.e(TAG, "", e); }
           */
    }
    return null;
}

From source file:com.blackducksoftware.tools.commonframework.core.encryption.Password.java

/**
 * Decrypt the given binary/encrypted password, and return the original text
 * password. The argument should have been encrypted using a valid
 * (according to isValidPassword() password encrypted by the
 * encryptStringToBinary() method.//w ww. ja  va2s . c o  m
 *
 * @param encryptedPasswordBinary
 * @return the original text password
 * @throws KeyStoreException
 * @throws NoSuchAlgorithmException
 * @throws CertificateException
 * @throws IOException
 * @throws UnrecoverableKeyException
 * @throws InvalidKeyException
 * @throws NoSuchPaddingException
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 */
public static String decryptBinaryToString(final byte[] encryptedPasswordBinary) throws KeyStoreException,
        NoSuchAlgorithmException, CertificateException, IOException, UnrecoverableKeyException,
        InvalidKeyException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {

    // get key
    final Key key = getKey(KEY_PASSWORD);
    if (key == null) {
        throw new InvalidKeyException("The password decryption key is null");
    }

    // decrypt
    final Cipher cipher = Cipher.getInstance(CIPHER_TRANSFORMATION);
    cipher.init(Cipher.DECRYPT_MODE, key);
    byte[] decryptedBytes = cipher.doFinal(encryptedPasswordBinary);
    decryptedBytes = Arrays.copyOf(decryptedBytes, MAX_LENGTH);

    // convert byte array to String
    final String reconstitutedString = new String(decryptedBytes, UTF8).trim();
    return reconstitutedString;
}

From source file:com.eucalyptus.imaging.manifest.DownloadManifestFactory.java

private static EncryptedKey reEncryptKey(EncryptedKey in, PublicKey keyToUse) throws Exception {
    // Decrypt key and IV with Eucalyptus
    PrivateKey pk = SystemCredentials.lookup(Eucalyptus.class).getPrivateKey();
    Cipher cipher = Ciphers.RSA_PKCS1.get();
    cipher.init(Cipher.DECRYPT_MODE, pk, Crypto.getSecureRandomSupplier().get());
    byte[] key = cipher.doFinal(Hashes.hexToBytes(in.getKey()));
    byte[] iv = cipher.doFinal(Hashes.hexToBytes(in.getIV()));
    // Encrypt key and IV with NC
    cipher.init(Cipher.ENCRYPT_MODE, keyToUse, Crypto.getSecureRandomSupplier().get());
    return new EncryptedKey(Hashes.bytesToHex(cipher.doFinal(key)), Hashes.bytesToHex(cipher.doFinal(iv)));
}

From source file:com.dinochiesa.edgecallouts.AesCryptoCallout.java

public static byte[] aesDecrypt(String cipherName, byte[] key, byte[] iv, byte[] cipherText) throws Exception {
    Cipher cipher = Cipher.getInstance(cipherName);
    cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key, "AES"), new IvParameterSpec(iv));
    byte[] clearText = cipher.doFinal(cipherText);
    return clearText;
}