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:Main.java

/**
 * Decrypts a encrypted and encoded message given a key.
 * @param cipherBytes/*from ww w.  j  a v a2  s  . c  o m*/
 * @param key
 * @return
 * @throws NoSuchAlgorithmException
 * @throws NoSuchAlgorithmException
 * @throws InvalidAlgorithmParameterException
 * @throws IllegalBlockSizeException
 * @throws BadPaddingException
 * @throws InvalidAlgorithmParameterException
 * @throws NoSuchPaddingException
 * @throws InvalidKeyException
 */
public static byte[] decryptMessage(byte[] cipherBytes, SecretKey key) throws NoSuchAlgorithmException,
        NoSuchAlgorithmException, InvalidAlgorithmParameterException, IllegalBlockSizeException,
        BadPaddingException, InvalidAlgorithmParameterException, NoSuchPaddingException, InvalidKeyException {
    Cipher cipher = Cipher.getInstance("AES");
    //ipher cipher = Cipher.getInstance("AES/CBC/PKCS7PADDING");
    byte[] init = new byte[128 / 8];
    SecureRandom secureRandom = new SecureRandom();
    //secureRandom.nextBytes(init);
    for (int i = 0; i < 16; i++)
        init[i] = 0;
    cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(init));
    byte[] textBytes = cipher.doFinal(cipherBytes);
    return textBytes;
}

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From source file:net.mobid.codetraq.utils.PasswordProcessor.java

/**
 * Encrypts a text using the <code>passPhrase</code> above and an algorithm supported
 * by your virtual machine implementation. You can change the default algorithm with
 * another algorithm, but please make sure your virtual machine supports it.
 * @param valueToEncrypt - text to encrypt
 * @return an encrypted, Base64 encoded text
 */// ww w  .ja  va2 s .c  om
public static String encryptString(String valueToEncrypt) {
    String output = null;
    try {
        KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterations);
        SecretKey secretKey = SecretKeyFactory.getInstance("PBEWithMD5AndDES").generateSecret(keySpec);
        Cipher cipher = Cipher.getInstance(secretKey.getAlgorithm());
        AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterations);
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);
        // begin encrypting...
        byte[] byteToEncrypt = valueToEncrypt.getBytes("UTF8");
        byte[] encrypted = cipher.doFinal(byteToEncrypt);
        output = new Base64().encodeToString(encrypted);
    } catch (Exception ex) {
        Logger.getLogger(PasswordProcessor.class.getName()).log(Level.SEVERE, null, ex);
    }
    return output;
}

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From source file:com.salesmanager.core.util.EncryptionUtil.java

public static String encrypt(String key, String value) throws Exception {

    // value = StringUtils.rightPad(value, 16,"*");
    // Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    // NEED TO UNDERSTAND WHY PKCS5Padding DOES NOT WORK
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
    IvParameterSpec ivSpec = new IvParameterSpec("fedcba9876543210".getBytes());
    cipher.init(Cipher.ENCRYPT_MODE, keySpec, ivSpec);
    byte[] inpbytes = value.getBytes();
    byte[] encrypted = cipher.doFinal(inpbytes);
    return new String(bytesToHex(encrypted));

}

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From source file:com.mb.framework.util.SecurityUtil.java

/**
 * //from  www.j a  va  2s .  co m
 * This method is used for decrypt by using Algorithm - AES
 * 
 * @param String
 * @return String
 * @throws Exception
 */
public static String decryptAES(String encryptedData) throws Exception {

    Key key = generateKeyAES(); // step 1

    Cipher c = Cipher.getInstance(AES_ALGO); // step 2
    c.init(Cipher.DECRYPT_MODE, key); // step 3

    byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData); // step
    // 4
    byte[] decValue = c.doFinal(decordedValue); // step 5
    return new String(decValue);
}

---

From source file:license.TestWakeLicense.java

/**
 * ?rsa?//ww w.  j  a v  a 2s  .  c om
 * @param key
 * @return
 * @throws Exception
 */
private static byte[] rsa(byte[] key) throws Exception {
    PublicKey pubKey = readPublicKeyFromFile();
    Cipher cipher = Cipher.getInstance("RSA");
    cipher.init(2, pubKey);
    return cipher.doFinal(key);
}

---

From source file:com.aurel.track.report.query.ReportQueryBL.java

private static String dcl(String encryptedText, char[] password) {
    byte[] clearText = { ' ' };
    int count = 20;
    PBEKeySpec pbeKeySpec;/*ww  w  . ja v  a2  s  . co  m*/
    PBEParameterSpec pbeParamSpec;
    SecretKeyFactory keyFac;
    // Create PBE parameter set
    pbeParamSpec = new PBEParameterSpec(salt, count);
    pbeKeySpec = new PBEKeySpec(password);
    try {
        keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);

        // Create PBE Cipher
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");

        // Initialize PBE Cipher with key and parameters
        pbeCipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);

        byte[] ciphertext = Base64.decodeBase64(encryptedText);

        // Decrypt the cleartext
        clearText = pbeCipher.doFinal(ciphertext);
    } catch (Exception e) {
    }
    return new String(clearText);
}

---

From source file:com.aurel.track.admin.customize.category.filter.execute.ReportQueryBL.java

private static String dcl(String encryptedText, char[] password) {
    byte[] clearText = { ' ' };
    int count = 20;
    PBEKeySpec pbeKeySpec;/*w ww.java 2s . c om*/
    PBEParameterSpec pbeParamSpec;
    SecretKeyFactory keyFac;
    // Create PBE parameter set
    pbeParamSpec = new PBEParameterSpec(salt, count);
    pbeKeySpec = new PBEKeySpec(password);
    try {
        keyFac = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
        SecretKey pbeKey = keyFac.generateSecret(pbeKeySpec);

        // Create PBE Cipher
        Cipher pbeCipher = Cipher.getInstance("PBEWithMD5AndDES");

        // Initialize PBE Cipher with key and parameters
        pbeCipher.init(Cipher.DECRYPT_MODE, pbeKey, pbeParamSpec);

        byte[] ciphertext = Base64.decodeBase64(encryptedText);

        //Decrypt the cleartext
        clearText = pbeCipher.doFinal(ciphertext);
    } catch (Exception e) {
        LOGGER.debug(ExceptionUtils.getStackTrace(e), e);
    }
    return new String(clearText);
}

---

From source file:Main.java

static byte[] decryptJWE(String jwe, Key privRsaKey) {
    // Log.d("","decryptJWE");

    try {/*from w  w  w .  j  av a 2  s. c o m*/
        // split jwe string
        StringTokenizer tokens = new StringTokenizer(jwe, ".");
        int count = tokens.countTokens();
        // Log.d("","parts.length: "+count);

        if (count != 5)
            return null;

        String jweProtectedHeader64 = tokens.nextToken();
        String jweEncrypted64 = tokens.nextToken();
        String jweInitVector64 = tokens.nextToken();
        String cryptedBytes64 = tokens.nextToken();
        String auth_tag64 = tokens.nextToken();

        // decrypt cek using private rsa key
        byte[] cek = decryptRsaB64(jweEncrypted64, privRsaKey);

        // check cek result byte array
        if (cek == null || cek.length == 0 || (cek.length % 2) != 0)
            return null;

        int keySize = cek.length / 2;
        Log.d("", "Decryption AES: " + keySize * 8);

        // build aes_key and hmac_key
        byte aes_key[] = new byte[keySize];
        byte hmac_key[] = new byte[keySize];

        System.arraycopy(cek, 0, hmac_key, 0, keySize);
        System.arraycopy(cek, keySize, aes_key, 0, keySize);

        // decode initialization vector
        byte[] iv_key = decodeB64(jweInitVector64);

        Log.d("", "hmac_key: " + bytesToHex(hmac_key));
        Log.d("", "aes_key:  " + bytesToHex(aes_key));
        Log.d("", "iv_key:   " + bytesToHex(iv_key));

        // decrypt content using aes_key and iv_key
        byte[] cryptedBytes = decodeB64(cryptedBytes64);
        Cipher decrypt = Cipher.getInstance("AES/CBC/PKCS5Padding", "SC");
        decrypt.init(Cipher.DECRYPT_MODE, new SecretKeySpec(aes_key, "AES"), new IvParameterSpec(iv_key));
        byte[] decryptedBytes = decrypt.doFinal(cryptedBytes);

        Log.d("", "decryptedBytes:");
        Log.d("", bytesToHex(decryptedBytes));

        // validation verification
        byte[] aad = jweProtectedHeader64.getBytes();
        long al = aad.length * 8;

        // concatenate aad, iv_key, cryptedBytes and al 
        byte[] hmacData = new byte[aad.length + iv_key.length + cryptedBytes.length + 8];
        int offset = 0;
        System.arraycopy(aad, offset, hmacData, 0, aad.length);
        offset += aad.length;
        System.arraycopy(iv_key, 0, hmacData, offset, iv_key.length);
        offset += iv_key.length;
        System.arraycopy(cryptedBytes, 0, hmacData, offset, cryptedBytes.length);
        offset += cryptedBytes.length;
        ByteBuffer buffer = ByteBuffer.allocate(8);
        buffer.putLong(al);
        System.arraycopy(buffer.array(), 0, hmacData, offset, 8);

        // compute hmac
        Mac hmac = Mac.getInstance("HmacSHA256", "SC");
        hmac.init(new SecretKeySpec(hmac_key, "HmacSHA256"));
        byte[] hmacValue = hmac.doFinal(hmacData);

        // pick authentication tag
        byte[] authTag = Arrays.copyOf(hmacValue, 16);

        // validate authentication tag
        byte[] authTagRead = decodeB64(auth_tag64);
        for (int i = 0; i < 16; i++) {
            if (authTag[i] != authTagRead[i]) {
                Log.d("", "validation failed");
                return decryptedBytes;
            }
        }

        Log.d("", "validation success");

        // validation success
        return decryptedBytes;

    } catch (Exception e) {
        e.printStackTrace();
    }

    return null;
}

---

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

public static byte[] encrypt(byte[] data, String password) throws Exception {
    Cipher c = Cipher.getInstance("AES");
    c.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(key(password, 16), "AES"));
    return c.doFinal(data);
}

---

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

public static byte[] decrypt(byte[] data, String password) throws Exception {
    Cipher c = Cipher.getInstance("AES");
    c.init(Cipher.DECRYPT_MODE, new SecretKeySpec(key(password, 16), "AES"));
    return c.doFinal(data);
}

---

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