Example usage for javax.crypto Cipher DECRYPT

Introduction

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

Prototype

int DECRYPT_MODE

To view the source code for javax.crypto Cipher DECRYPT_MODE.

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Document

Constant used to initialize cipher to decryption mode.

Usage

From source file:de.uzk.hki.da.utils.PasswordUtils.java

public static String decryptPassword(String password) {

    byte key[] = "394z57f4".getBytes();
    byte decryptedPassword[];

    try {//ww  w.j  ava 2 s  .  c  om
        SecretKey secretKey = SecretKeyFactory.getInstance("DES").generateSecret(new DESKeySpec(key));
        Cipher decrypt = Cipher.getInstance("DES/CBC/PKCS5Padding");
        decrypt.init(Cipher.DECRYPT_MODE, secretKey,
                new IvParameterSpec(new byte[] { 0x01, 0x02, 0x04, 0x10, 0x01, 0x02, 0x04, 0x10 }));
        decryptedPassword = decrypt.doFinal(Base64.decodeBase64(password.getBytes()));

    } catch (GeneralSecurityException e) {
        throw new RuntimeException("Couldn't decrypt password " + password + e);
    }

    return new String(decryptedPassword);
}

From source file:com.avbravo.avbravoutils.crypto.Encriptador.java

public static String decrypt(String key, String encrypted) throws Exception {
    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);
}

From source file:com.intera.roostrap.util.EncryptionUtil.java

public static void decrypt(String encryptionKey, InputStream is, OutputStream os)
        throws InvalidKeyException, IOException {
    encryptOrDecrypt(encryptionKey, Cipher.DECRYPT_MODE, is, os);
}

From source file:com.ad.mediasharing.tvmclient.AESEncryption.java

public static byte[] decrypt(byte[] cipherBytes, String key, byte[] iv) throws Exception {
    Cipher cipher = Cipher.getInstance(ENCRYPTION_ALGORITHM);
    AlgorithmParameters params = AlgorithmParameters.getInstance("AES");
    params.init(new IvParameterSpec(iv));
    cipher.init(Cipher.DECRYPT_MODE, getKey(key), params);
    return cipher.doFinal(cipherBytes);
}

From source file:com.doculibre.constellio.utils.aes.SimpleProtector.java

public static String decrypt(String encryptedValue) throws Exception {
    Key key = generateKey();// ww w.  j a  va2s .c o m
    Cipher c = Cipher.getInstance(ALGORITHM);
    c.init(Cipher.DECRYPT_MODE, key);
    byte[] decordedValue = Base64.decodeBase64(encryptedValue);
    byte[] decValue = c.doFinal(decordedValue);
    String decryptedValue = new String(decValue);
    return decryptedValue;
}

From source file:com.lecaddyfute.utils.security.AESCrypto.java

public static String decrypt1(String encryptedData) throws Exception {
    KeyGenerator keyGen = KeyGenerator.getInstance(ALGO);
    keyGen.init(128);/*  w  w w.jav a2  s.c  om*/
    SecretKey key = keyGen.generateKey();
    Cipher c = Cipher.getInstance(ALGO);

    c.init(Cipher.DECRYPT_MODE, key);
    //        byte[] decordedValue = Base64.decodeBase64(encryptedData.getBytes());
    //        byte[] decValue = c.doFinal(decordedValue);
    byte[] decValue = c.doFinal(encryptedData.getBytes("UTF8"));
    String decryptedValue = new String(decValue);
    return decryptedValue;
}

From source file:br.com.aws.odonto.utils.CipherUtil.java

public static synchronized String decrypt(String token) throws Exception {
    String tokenDecrypt = null;/*w ww  .ja  v  a  2 s  .  c  o  m*/
    try {
        byte[] strDecodeCipher = base64.decode(token.getBytes());
        //System.out.println("    base64 decode: "+new String(strDecodeCipher));
        cipher.init(Cipher.DECRYPT_MODE, secretKey);
        byte[] decryptedData = cipher.doFinal(strDecodeCipher);
        tokenDecrypt = new String(decryptedData);
        //System.out.println("cipher decrypt: " +tokenDecrypt);
    } catch (Exception e) {
        e.printStackTrace();
        throw e;
    }
    return tokenDecrypt;
}

From source file:Main.java

private static PKCS8EncodedKeySpec decryptPrivateKey(byte[] encryptedPrivateKey)
        throws GeneralSecurityException {
    EncryptedPrivateKeyInfo epkInfo;
    try {//from  w w  w. j  a va2s .co  m
        epkInfo = new EncryptedPrivateKeyInfo(encryptedPrivateKey);
    } catch (IOException ex) {
        // Probably not an encrypted key.
        return null;
    }

    char[] password = System.console().readPassword("Password for the private key file: ");

    SecretKeyFactory skFactory = SecretKeyFactory.getInstance(epkInfo.getAlgName());
    Key key = skFactory.generateSecret(new PBEKeySpec(password));
    Arrays.fill(password, '\0');

    Cipher cipher = Cipher.getInstance(epkInfo.getAlgName());
    cipher.init(Cipher.DECRYPT_MODE, key, epkInfo.getAlgParameters());

    try {
        return epkInfo.getKeySpec(cipher);
    } catch (InvalidKeySpecException ex) {
        System.err.println("Password may be bad.");
        throw ex;
    }
}

From source file:com.java.demo.DesDemo.java

public static byte[] Decrypt(byte[] strBytes) {
    try {// www . j a v  a2  s . c o  m
        Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, convertSecretKey);
        byte[] result = cipher.doFinal(strBytes);
        return result;
    } catch (Exception e) {
        return null;
    }
}

From source file:com.philosophy.LicenseDecoder.java

public LicenseDecoder(String text) {
    license = text;/*from www.  j a  v  a2 s.co  m*/
    byte[] keyBytes = { 88, 42, 94, 52, 56, 81, 82, 98 };
    System.out.println("Original License : " + license);
    try {
        SecretKey key = new SecretKeySpec(keyBytes, "DES");
        Cipher cipher = Cipher.getInstance("DES");
        byte[] decoded = Base64.decodeBase64(license.getBytes());
        cipher.init(Cipher.DECRYPT_MODE, key);
        byte[] decrypted = cipher.doFinal(decoded);
        System.out.println("Decrypted license : " + new String(decrypted));
    } catch (NoSuchAlgorithmException e) {
    } catch (NoSuchPaddingException e) {
    } catch (InvalidKeyException e) {
    } catch (IllegalStateException e) {
    } catch (IllegalBlockSizeException e) {
    } catch (BadPaddingException e) {
    }
}

Example usage for javax.crypto Cipher DECRYPT_MODE

Introduction

Prototype

Document

Usage