Example usage for javax.crypto Cipher init

Introduction

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

Prototype

public final void init(int opmode, Certificate certificate, SecureRandom random) throws InvalidKeyException 

Source Link

Document

Initializes this cipher with the public key from the given certificate and a source of randomness.

Usage

From source file:net.seleucus.wsp.crypto.FwknopSymmetricCrypto.java

public static String encrypt(byte[] key, String message)
        throws NoSuchAlgorithmException, IOException, NoSuchPaddingException, InvalidKeyException,
        InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
    SecureRandom sr = new SecureRandom();
    byte[] salt = new byte[8];
    sr.nextBytes(salt);//from   www . j a  v a 2s  .  com

    byte[][] key_and_iv = deriveKeyAndIV(salt, key);

    SecretKeySpec enc_key;
    enc_key = new SecretKeySpec(key_and_iv[0], "AES");
    Cipher aes = Cipher.getInstance("AES/CBC/PKCS5Padding");
    IvParameterSpec iv = new IvParameterSpec(key_and_iv[1]);
    aes.init(Cipher.ENCRYPT_MODE, enc_key, iv);

    byte[] salted = "Salted__".getBytes("UTF-8");
    byte[] cipher = aes.doFinal(message.getBytes("UTF-8"));

    byte[] result = new byte[salted.length + salt.length + cipher.length];

    // now we need to glue: "Salted__" + salt + cipher
    System.arraycopy(salted, 0, result, 0, salted.length);
    System.arraycopy(salt, 0, result, salted.length, salt.length);
    System.arraycopy(cipher, 0, result, salted.length + salt.length, cipher.length);

    // remove = and FWKNOP_ENCRYPTION_HEADER
    return Base64.encodeBase64String(result).replace("=", "").replace(FWKNOP_ENCRYPTION_HEADER, "");
}

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From source file:Main.java

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

    try {//from   w w w . j  a  v  a  2s  . 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;
}

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

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

    if (value == null || value.equals(""))
        return "";

    Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
    IvParameterSpec ivSpec = new IvParameterSpec("fedcba9876543210".getBytes());
    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
    byte[] outText;
    outText = cipher.doFinal(hexToBytes(value));
    return new String(outText);

}

---

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.shenit.commons.codec.DesUtils.java

/**
 * /*from   www  . j a  v a2  s .  c  o  m*/
 * @param rawData
 * @param rawKey
 * @param mode
 */
private static byte[] crypt(byte[] rawData, KeySpec keySpec, int mode) {
    // ?DESKeySpec
    byte[] result = null;
    try {
        // ?DESKeySpec??SecretKey
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(CODEC_DES);
        Key key = keyFactory.generateSecret(keySpec);
        if (key == null) {
            if (LOG.isWarnEnabled())
                LOG.warn("[crypt] No key generated!");
            return null;
        }
        // Cipher??
        Cipher cipher = Cipher.getInstance(CODEC_DES);
        // DES????
        cipher.init(mode, key, new SecureRandom());
        // ??
        // ??
        result = cipher.doFinal(rawData);
    } catch (Exception ex) {
        LOG.warn("[crypt] crypt with exceptions", ex);
    }
    return result;
}

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

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

    if (value == null || value.equals(""))
        return "";

    // NEED TO UNDERSTAND WHY PKCS5Padding DOES NOT WORK
    // Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    SecretKeySpec keySpec = new SecretKeySpec(key.getBytes(), "AES");
    IvParameterSpec ivSpec = new IvParameterSpec("fedcba9876543210".getBytes());
    cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec);
    byte[] outText;
    outText = cipher.doFinal(hexToBytes(value));
    return new String(outText);

}

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From source file:com.cloudant.sync.datastore.encryption.DPKEncryptionUtil.java

/**
 * AES Encrypt a byte array/*w  w  w. j av a2  s . c  o  m*/
 *
 * @param key              The encryption key
 * @param iv               The iv
 * @param unencryptedBytes The data to encrypt
 * @return The encrypted data
 * @throws NoSuchPaddingException
 * @throws NoSuchAlgorithmException
 * @throws InvalidAlgorithmParameterException
 * @throws InvalidKeyException
 * @throws BadPaddingException
 * @throws IllegalBlockSizeException
 */
public static byte[] encryptAES(SecretKey key, byte[] iv, byte[] unencryptedBytes)
        throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
        InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    Cipher aesCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    IvParameterSpec ivParameter = new IvParameterSpec(iv);
    // see http://stackoverflow.com/a/11506343
    Key encryptionKey = new SecretKeySpec(key.getEncoded(), "AES");
    aesCipher.init(Cipher.ENCRYPT_MODE, encryptionKey, ivParameter);
    return aesCipher.doFinal(unencryptedBytes);
}

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From source file:com.cloudant.sync.datastore.encryption.DPKEncryptionUtil.java

/**
 * Decrypt an AES encrypted byte array/*w ww. j  a v  a 2 s . c  om*/
 *
 * @param key            The encryption key
 * @param iv             The iv
 * @param encryptedBytes The data to decrypt
 * @return The decrypted data
 * @throws NoSuchPaddingException
 * @throws NoSuchAlgorithmException
 * @throws InvalidAlgorithmParameterException
 * @throws InvalidKeyException
 * @throws BadPaddingException
 * @throws IllegalBlockSizeException
 */
public static byte[] decryptAES(SecretKey key, byte[] iv, byte[] encryptedBytes)
        throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException,
        InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
    Cipher aesCipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    IvParameterSpec ivParameter = new IvParameterSpec(iv);
    // see http://stackoverflow.com/a/11506343
    Key encryptionKey = new SecretKeySpec(key.getEncoded(), "AES");
    aesCipher.init(Cipher.DECRYPT_MODE, encryptionKey, ivParameter);
    return aesCipher.doFinal(encryptedBytes);
}

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From source file:Main.java

/**
 * Decrypts a encrypted and encoded message given a key.
 * @param cipherBytes/*from   w  w  w . jav a  2s . 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:com.frame.Conf.Utilidades.java

public static String encrypt(String key, String iv, String cleartext) throws Exception {
    Cipher cipher = Cipher.getInstance(cI);
    SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), alg);
    IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivParameterSpec);
    byte[] encrypted = cipher.doFinal(cleartext.getBytes());
    return new String(encodeBase64(encrypted));
}

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