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, int inputOffset, int inputLen)
        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:Main.java

/**
 * Invokes the Cipher to perform encryption or decryption (depending on the
 * initialized mode)./*from ww  w  .j  a v a  2  s. c  o m*/
 */
public static byte[] doFinal(Cipher cipher, byte[] input, int inputOffSet, int inputLen) {
    try {
        return cipher.doFinal(input, inputOffSet, inputLen);
    } catch (IllegalBlockSizeException e) {
        throw new IllegalStateException("Unable to invoke Cipher due to illegal block size", e);
    } catch (BadPaddingException e) {
        throw new IllegalStateException("Unable to invoke Cipher due to bad padding", e);
    }
}

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From source file:com.bytecode.util.Crypto.java

private static byte[] decrypt(String keystring, byte[] message, int bits) throws Exception {
    byte[] decValue = null;
    byte[] nonceBytes = Arrays.copyOf(Arrays.copyOf(message, 8), 16);
    IvParameterSpec nonce = new IvParameterSpec(nonceBytes);

    Key key = generateKey(keystring, bits);
    Cipher c = Cipher.getInstance(ALGORITHM);
    c.init(Cipher.DECRYPT_MODE, key, nonce);
    decValue = c.doFinal(message, 8, message.length - 8);

    return decValue;
}

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From source file:com.kixeye.chassis.transport.crypto.SymmetricKeyCryptoUtils.java

/**
 * Encrypts a data blob using the given key and cipher.
 * //from   w  w  w.j  a  v a 2  s . com
 * @param data
 * @param offset
 * @param length
 * @param key
 * @param cipher
 * @return
 * @throws GeneralSecurityException
 */
public static byte[] encrypt(byte[] data, int offset, int length, Key key, String cipherTransformation,
        String cipherProvider) throws GeneralSecurityException {
    Cipher cipher = loadCipher(cipherTransformation, cipherProvider);
    cipher.init(Cipher.ENCRYPT_MODE, key);

    return cipher.doFinal(data, offset, length);
}

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From source file:com.kixeye.chassis.transport.crypto.SymmetricKeyCryptoUtils.java

/**
 * Decrypts a data blob using the given key and cipher.
 * // w w w . j  a  v a  2  s.co  m
 * @param data
 * @param offset
 * @param length
 * @param key
 * @param cipher
 * @return
 * @throws GeneralSecurityException
 */
public static byte[] decrypt(byte[] data, int offset, int length, Key key, String cipherTransformation,
        String cipherProvider) throws GeneralSecurityException {
    Cipher cipher = loadCipher(cipherTransformation, cipherProvider);
    cipher.init(Cipher.DECRYPT_MODE, key);

    return cipher.doFinal(data, offset, length);
}

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

/**
 * Private decryption method.//  w  w w . ja  v a 2 s.  c  om
 * 
 * @param keystring
 * @param message
 * @param bits
 * @return bytearray containing decrypted message
 * @throws Exception
 */
private static byte[] decrypt(String keystring, byte[] message, int bits) throws Exception {
    byte[] decValue = null;
    byte[] nonceBytes = Arrays.copyOf(Arrays.copyOf(message, 8), 16);
    IvParameterSpec nonce = new IvParameterSpec(nonceBytes);

    Key key = generateKey(keystring, bits);
    Cipher c = Cipher.getInstance(ALGORITHM);
    c.init(Cipher.DECRYPT_MODE, key, nonce);
    decValue = c.doFinal(message, 8, message.length - 8);

    return decValue;
}

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From source file:de.mpg.escidoc.services.aa.crypto.RSAEncoder.java

public static String rsaEncrypt(String string) throws Exception {
    StringWriter resultWriter = new StringWriter();
    byte[] bytes = string.getBytes("UTF-8");
    PublicKey pubKey = (PublicKey) readKeyFromFile(Config.getProperty("escidoc.aa.public.key.file"), true);
    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.ENCRYPT_MODE, pubKey);
    int blockSize = 245;
    for (int i = 0; i < bytes.length; i += blockSize) {
        byte[] result = cipher.doFinal(bytes, i, (i + blockSize < bytes.length ? blockSize : bytes.length - i));
        if (i > 0) {
            resultWriter.write("&");
        }/*from   w ww  .  jav a 2  s.  com*/
        resultWriter.write("auth=");
        resultWriter.write(URLEncoder.encode(new String(Base64.encodeBase64(result)), "ISO-8859-1"));
    }
    return resultWriter.toString();

}

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From source file:net.firejack.platform.web.security.x509.KeyUtils.java

public static byte[] decrypt(PrivateKey key, byte[] bytes) throws Exception {
    byte[] result = new byte[0];

    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.DECRYPT_MODE, key);
    int length = cipher.getOutputSize(bytes.length);

    for (int i = 0; i < bytes.length; i += length) {
        byte[] bytes1 = cipher.doFinal(bytes, i, Math.min(bytes.length - i, length));
        result = ArrayUtils.addAll(result, bytes1);
    }//from  w  ww .j a  v  a 2 s  .c  o m

    return result;
}

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From source file:net.firejack.platform.web.security.x509.KeyUtils.java

public static byte[] encrypt(PublicKey key, byte[] bytes) throws Exception {
    byte[] result = new byte[0];

    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(Cipher.ENCRYPT_MODE, key);

    int length = cipher.getOutputSize(bytes.length) - 11;
    for (int i = 0; i < bytes.length; i += length) {
        byte[] buffer = cipher.doFinal(bytes, i, Math.min(bytes.length - i, length));
        result = ArrayUtils.addAll(result, buffer);
    }// w w w  . j  a  v a 2s  .  com

    return result;
}

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