Example usage for javax.crypto Cipher doFinal

List of usage examples for javax.crypto Cipher doFinal

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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.liusoft.dlog4j.upgrade.StringUtils.java

/**
 * //ww w . j a va 2 s .  co  m
 * @param src ??
 * @param key 8?
 * @return     ??
 * @throws Exception
 */
public static byte[] encrypt(byte[] src, byte[] key) throws Exception {
    //      DES????
    SecureRandom sr = new SecureRandom();
    // ?DESKeySpec
    DESKeySpec dks = new DESKeySpec(key);
    // ?DESKeySpec??
    // SecretKey
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
    SecretKey securekey = keyFactory.generateSecret(dks);
    // Cipher??
    Cipher cipher = Cipher.getInstance(DES);
    // ?Cipher
    cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
    // ??
    // ??
    return cipher.doFinal(src);
}

From source file:com.liusoft.dlog4j.upgrade.StringUtils.java

/**
 * /* w w w.  ja  v  a2  s  . co m*/
 * @param src   ??
 * @param key   8?
 * @return      ??
 * @throws Exception
 */
public static byte[] decrypt(byte[] src, byte[] key) throws Exception {
    //      DES????
    SecureRandom sr = new SecureRandom();
    // ?DESKeySpec
    DESKeySpec dks = new DESKeySpec(key);
    // ?DESKeySpec??
    // SecretKey
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
    SecretKey securekey = keyFactory.generateSecret(dks);
    // Cipher??
    Cipher cipher = Cipher.getInstance(DES);
    // ?Cipher
    cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
    // ??
    // ??
    return cipher.doFinal(src);
}

From source file:com.security.ch08_rsa.RSACoderTextKey.java

/**
 * //w  w  w. j a  va  2  s .c o m
 *
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 * @throws Exception
 */
private static byte[] encryptByPublicKey(byte[] data, byte[] key) throws Exception {

    // ?
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

    PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);

    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.ENCRYPT_MODE, publicKey);

    return cipher.doFinal(data);
}

From source file:cloudeventbus.pki.CertificateUtils.java

public static Certificate signCertificate(Certificate issuer, PrivateKey issuerPrivateKey,
        Certificate certificate) {
    if (issuer.getSerialNumber() != certificate.getIssuer()) {
        throw new CertificateIssuerMismatchException(
                "The authority certificate serial number doesn't much the certificate issuer.");
    }//ww  w.j a  va2  s  . c  om
    validatePermissions(issuer, certificate);
    final byte[] hash = certificate.hash();

    try {
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, issuerPrivateKey);
        final byte[] signature = cipher.doFinal(hash);
        return new Certificate(certificate.getType(), certificate.getSerialNumber(), certificate.getIssuer(),
                certificate.getExpirationDate(), certificate.getPublicKey(),
                certificate.getSubscribePermissions(), certificate.getPublishPermissions(),
                certificate.getComment(), signature);
    } catch (GeneralSecurityException e) {
        throw new CertificateSecurityException(e);
    }
}

From source file:com.credomatic.gprod.db2query2csv.Security.java

/**
 * Cifra una cadena de carateres utilizando el algoritmo AES y una llave (128, 256, o 512 bits). 
 * @param KeySize tamao de la llave autogenerada para relizar el cifrado
 * @param value cadena de caracteres que sera cifrada
 * @return instancia de tipo ${@link SecurityParams} con el resultado del proceso de cifrado
 *//*ww  w . j  a  v a2 s  .  com*/
public static SecurityParams encrypt(int KeySize, String value) {

    SecurityParams result = null;
    try {
        // Get the KeyGenerator
        final KeyGenerator kgen = KeyGenerator.getInstance("AES");
        kgen.init(KeySize);

        // Generate the secret key specs.
        final SecretKey skey = kgen.generateKey();
        final byte[] raw = skey.getEncoded();
        final SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
        final Cipher cipher = Cipher.getInstance("AES");

        cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
        final String key = new Base64().encodeAsString(raw);
        final String encrypt = (new Base64()).encodeAsString(cipher.doFinal(value.getBytes()));

        result = new SecurityParams(encrypt, key, KeySize);

    } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | IllegalBlockSizeException
            | BadPaddingException ex) {
        Logger.getLogger(Security.class.getName()).log(Level.SEVERE, null, ex);
    }
    return result;
}

From source file:com.security.ch08_rsa.RSACoderTextKey.java

/**
 * /*from ww  w . ja  v a2  s  . co m*/
 *
 * @param data
 *            ?
 * @param key
 *            
 * @return byte[] ?
 * @throws Exception
 */
private static byte[] decryptByPublicKey(byte[] data, byte[] key) throws Exception {

    // ?
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(key);

    KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);

    // ?
    PublicKey publicKey = keyFactory.generatePublic(x509KeySpec);

    // ?
    Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());

    cipher.init(Cipher.DECRYPT_MODE, publicKey);

    return cipher.doFinal(data);
}

From source file:com.security.ch08_rsa.RSACoderTextKey.java

/**
 * ?/*from www . j  a  v a 2 s.c  o  m*/
 *
 * @param data
 *            ?
 * @param key
 *            ?
 * @return byte[] ?
 * @throws Exception
 */
private 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.security.ch08_rsa.RSACoderTextKey.java

/**
 * ?/* www .jav a  2s. c  om*/
 *
 * @param data
 *            ?
 * @param key
 *            ?
 * @return byte[] ?
 * @throws Exception
 */
private 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:net.seleucus.wsp.crypto.FwknopSymmetricCrypto.java

public static String decrypt(byte[] key, String ciphertext)
        throws NoSuchAlgorithmException, IOException, NoSuchPaddingException, InvalidKeyException,
        InvalidAlgorithmParameterException, IllegalBlockSizeException, BadPaddingException {
    if (!ciphertext.startsWith(FWKNOP_ENCRYPTION_HEADER)) {
        ciphertext = FWKNOP_ENCRYPTION_HEADER.concat(ciphertext);
    }//from  w  w  w  . j  a  va  2s  . co m
    // we need to remove Salted__ from the salt_and_ciphertext therefore -> SALT_LEN +/- 8

    byte[] salt_and_ciphertext = Base64.decodeBase64(ciphertext);
    byte[] salt = new byte[SALT_LEN];
    byte[] cipher = new byte[salt_and_ciphertext.length - SALT_LEN - 8];
    System.arraycopy(salt_and_ciphertext, 8, salt, 0, SALT_LEN);
    System.arraycopy(salt_and_ciphertext, 8 + SALT_LEN, cipher, 0, cipher.length);
    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.DECRYPT_MODE, enc_key, iv);
    byte[] plain = aes.doFinal(cipher);

    return new String(plain, "UTF-8");
}

From source file:ec.edu.uce.medicina.seguimiento.util.EncryptionUtility.java

/**
 *Mtodo que permite la desencriptacin de la contrasea
 * @param encrypted/*from w  w w .ja va 2 s . c o m*/
 * @return
 * @throws Exception
 */
public static String decrypt(String encrypted) throws Exception {
    String key = "02AE31B79CCCB2A3"; //llave
    String iv = "0123456789ABCDEF";
    Cipher cipher = Cipher.getInstance(cI);
    SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), alg);
    IvParameterSpec ivParameterSpec = new IvParameterSpec(iv.getBytes());
    byte[] enc = decodeBase64(encrypted);
    cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivParameterSpec);
    byte[] decrypted = cipher.doFinal(enc);
    return new String(decrypted);
}