Examples with DESKeySpec javax.crypto.spec.DESKeySpec used on opensource projects

Example 11 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project oxCore by GluuFederation.

the class StringEncrypter method decrypt.

/**
 * Decrypt a string encrypted with this encrypter
 *
 * @param encryptedString
 *            Encrypted string
 * @return Decrypted string
 * @throws EncryptionException
 */
public String decrypt(final String encryptedString, String encryptionKey) throws EncryptionException {
    lock.lock();
    try {
        final byte[] keyAsBytes = encryptionKey.getBytes(StringEncrypter.UNICODE_FORMAT);
        String encryptionScheme = StringEncrypter.DESEDE_ENCRYPTION_SCHEME;
        KeySpec keySpec;
        if (encryptionScheme.equalsIgnoreCase(StringEncrypter.DESEDE_ENCRYPTION_SCHEME)) {
            keySpec = new DESedeKeySpec(keyAsBytes);
        } else if (encryptionScheme.equalsIgnoreCase(StringEncrypter.DES_ENCRYPTION_SCHEME)) {
            keySpec = new DESKeySpec(keyAsBytes);
        } else {
            throw new IllegalArgumentException("Encryption scheme not supported: " + encryptionScheme);
        }
        return decrypt(encryptedString, keySpec);
    } catch (final Exception e) {
        throw new EncryptionException(e);
    } finally {
        lock.unlock();
    }
}

Example 12 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project YhLibraryForAndroid by android-coco.

the class CipherUtils method getDESKey.

/**
 * 返回可逆算法DES的密钥
 *
 * @param key
 *            前8字节将被用来生成密钥。
 * @return 生成的密钥
 * @throws Exception
 */
public static Key getDESKey(byte[] key) throws Exception {
    DESKeySpec des = new DESKeySpec(key);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    return keyFactory.generateSecret(des);
}

Example 13 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project MVPFrames by RockyQu.

the class DES method decrypt.

/**
 * 将DES加密的字符串解密
 *
 * @param encrypted 加密过的字符串
 * @return 未加密源字符串
 */
public String decrypt(String encrypted) {
    byte[] retByte = null;
    // Create SecretKey object
    DESKeySpec dks = null;
    try {
        dks = new DESKeySpec(KEY);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
        SecretKey securekey = keyFactory.generateSecret(dks);
        // Create IvParameterSpec object with initialization vector
        IvParameterSpec spec = new IvParameterSpec(IV);
        // Create Cipter object
        Cipher cipher = Cipher.getInstance(TRANSFORMATION);
        // Initialize Cipher object
        cipher.init(Cipher.DECRYPT_MODE, securekey, spec);
        if (code == 0) {
            retByte = encrypted.getBytes("ISO-8859-1");
        } else if (code == 1) {
            retByte = decode(encrypted);
        } else {
            retByte = encrypted.getBytes();
        }
        // Decrypting data
        retByte = cipher.doFinal(retByte);
        return new String(retByte, "utf-8");
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

Example 14 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project jeesuite-libs by vakinge.

the class DES method decrypt.

/**
 * DES算法，解密
 *
 * @param data 待解密字符串
 * @param key  解密私钥，长度不能够小于8位
 * @return 解密后的字节数组
 * @throws Exception 异常
 */
public static String decrypt(String key, String data) {
    if (data == null)
        return null;
    try {
        DESKeySpec dks = new DESKeySpec(key.getBytes());
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        // key的长度不能够小于8位字节
        Key secretKey = keyFactory.generateSecret(dks);
        Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
        AlgorithmParameterSpec paramSpec = new IvParameterSpec(IV_PARAMS_BYTES);
        cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
        return new String(cipher.doFinal(hex2byte(data.getBytes())));
    } catch (Exception e) {
        e.printStackTrace();
        return data;
    }
}

Example 15 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project Bytecoder by mirkosertic.

the class NTLM method calcResponse.

/* key is a 21 byte array. Split it into 3 7 byte chunks,
     * Convert each to 8 byte DES keys, encrypt the text arg with
     * each key and return the three results in a sequential []
     */
byte[] calcResponse(byte[] key, byte[] text) {
    try {
        assert key.length == 21;
        DESKeySpec dks1 = new DESKeySpec(makeDesKey(key, 0));
        DESKeySpec dks2 = new DESKeySpec(makeDesKey(key, 7));
        DESKeySpec dks3 = new DESKeySpec(makeDesKey(key, 14));
        SecretKey key1 = fac.generateSecret(dks1);
        SecretKey key2 = fac.generateSecret(dks2);
        SecretKey key3 = fac.generateSecret(dks3);
        cipher.init(Cipher.ENCRYPT_MODE, key1);
        byte[] out1 = cipher.doFinal(text, 0, 8);
        cipher.init(Cipher.ENCRYPT_MODE, key2);
        byte[] out2 = cipher.doFinal(text, 0, 8);
        cipher.init(Cipher.ENCRYPT_MODE, key3);
        byte[] out3 = cipher.doFinal(text, 0, 8);
        byte[] result = new byte[24];
        System.arraycopy(out1, 0, result, 0, 8);
        System.arraycopy(out2, 0, result, 8, 8);
        System.arraycopy(out3, 0, result, 16, 8);
        return result;
    } catch (IllegalBlockSizeException ex) {
        // None will happen
        assert false;
    } catch (BadPaddingException ex) {
        assert false;
    } catch (InvalidKeySpecException ex) {
        assert false;
    } catch (InvalidKeyException ex) {
        assert false;
    }
    return null;
}