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

Example 16 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project mailim by zengsn.

the class DESUtil method decrypt.

/**
 * DES解密方法
 *
 * @param message
 *            需要解密字符串
 * @param key
 *            解密需要的KEY
 * @param keyENCODED
 *            解密KEY转换编码
 * @param HexStringENCODED
 *            解密字符串转换编码
 * @param CipherInstanceType
 *            解密类型
 * @return
 * @throws Exception
 */
public static String decrypt(String message, String key, String keyENCODED, String HexStringENCODED, String CipherInstanceType) throws Exception {
    byte[] bytesrc = convertHexString(message);
    byte[] theKey = null;
    String jqstr = getstrByte(key).substring(0, 8).toUpperCase();
    theKey = jqstr.getBytes(keyENCODED);
    Cipher cipher = Cipher.getInstance(CipherInstanceType);
    DESKeySpec desKeySpec = new DESKeySpec(theKey);
    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
    SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
    IvParameterSpec iv = new IvParameterSpec(theKey);
    cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
    byte[] retByte = cipher.doFinal(bytesrc);
    return new String(retByte, HexStringENCODED);
}

Example 17 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project mailim by zengsn.

the class DESUtil method ENCRYPTMethod.

/**
 * DES加密
 *
 * @param HexString
 *            字符串（16位16进制字符串）
 * @param keyStr
 *            密钥16个1
 * @throws Exception
 */
public static String ENCRYPTMethod(String HexString, String keyStr) throws Exception {
    String jmstr = "";
    try {
        byte[] theKey = null;
        String jqstr = getstrByte(keyStr).substring(0, 8).toUpperCase();
        theKey = jqstr.getBytes(ENCODED_ASCII);
        Cipher cipher = Cipher.getInstance(CIPHER_INSTANCE_CBC);
        DESKeySpec desKeySpec = new DESKeySpec(theKey);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
        IvParameterSpec iv = new IvParameterSpec(theKey);
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);
        byte[] theCph = cipher.doFinal(HexString.getBytes(ENCODED_UTF8));
        jmstr = toHexString(theCph).toUpperCase();
        jmstr = toHexString(theCph);
    } catch (Exception e) {
        e.printStackTrace();
        return null;
    }
    return jmstr;
}

Example 18 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project happy-dns-android by qiniu.

the class DES method decrypt.

/**
 * Convert encrypted hex string to UTF-8 string
 * @param data data to decrypt
 * @param key decrypt key
 * @return UTF-8 string
 */
public static String decrypt(String data, String key) {
    try {
        Cipher c = Cipher.getInstance("DES/ECB/PKCS5Padding");
        c.init(Cipher.DECRYPT_MODE, SecretKeyFactory.getInstance("DES").generateSecret(new DESKeySpec(key.getBytes())));
        return new String(c.doFinal(Hex.decodeHex(data.toCharArray())), Charset.defaultCharset());
    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

Example 19 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project derby by apache.

the class EncryptionManager method decryptData.

// This method decrypts the usreid/password with the middle 8 bytes of
// the generated secret key and an encryption token. Then it returns the
// decrypted data in a byte array.
// plainText   The byte array form userid/password to encrypt.
// initVector  The byte array which is used to calculate the
// encryption token.
// targetPublicKey   DERBY' public key.
// Returns the decrypted data in a byte array.
public byte[] decryptData(byte[] cipherText, int securityMechanism, byte[] initVector, byte[] targetPublicKey) throws SqlException {
    byte[] plainText = null;
    Key key = null;
    if (token_ == null) {
        token_ = calculateEncryptionToken(securityMechanism, initVector);
    }
    try {
        if (secKey_ == null) {
            // use this encryption key to initiate a SecretKeySpec object
            secKey_ = generatePrivateKey(targetPublicKey);
            SecretKeySpec desKey = new SecretKeySpec(secKey_, "DES");
            key = desKey;
        } else {
            // use this encryption key to initiate a SecretKeySpec object
            DESKeySpec desKey = new DESKeySpec(secKey_);
            if (secretKeyFactory_ == null) {
                secretKeyFactory_ = SecretKeyFactory.getInstance("DES", providerName);
            }
            key = secretKeyFactory_.generateSecret(desKey);
        }
        // We use DES in CBC mode because this is the mode used in PROTOCOL. The
        // encryption mode has to be consistent for encryption and decryption.
        // CBC mode requires an initialization vector(IV) parameter. In CBC mode
        // we need to initialize the Cipher object with an IV, which can be supplied
        // using the javax.crypto.spec.IvParameterSpec class.
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding", providerName);
        // generate a IVParameterSpec object and use it to initiate the
        // Cipher object.
        IvParameterSpec ivParam = new IvParameterSpec(token_);
        // initiate the Cipher using encryption mode, encryption key and the
        // IV parameter.
        cipher.init(Cipher.DECRYPT_MODE, key, ivParam);
        // Execute the final phase of encryption
        plainText = cipher.doFinal(cipherText);
    } catch (NoSuchPaddingException e) {
        throw new SqlException(agent_.logWriter_, new ClientMessageId(SQLState.CRYPTO_NO_SUCH_PADDING));
    } catch (BadPaddingException e) {
        throw new SqlException(agent_.logWriter_, new ClientMessageId(SQLState.CRYPTO_BAD_PADDING));
    } catch (IllegalBlockSizeException e) {
        throw new SqlException(agent_.logWriter_, new ClientMessageId(SQLState.CRYPTO_ILLEGAL_BLOCK_SIZE));
    } catch (GeneralSecurityException e) {
        throw new SqlException(agent_.logWriter_, new ClientMessageId(SQLState.SECURITY_EXCEPTION_ENCOUNTERED), e);
    }
    return plainText;
}

Example 20 with DESKeySpec

use of javax.crypto.spec.DESKeySpec in project derby by apache.

the class EncryptionManager method encryptData.

// This method encrypts the usreid/password with the middle 8 bytes of
// the generated secret key and an encryption token. Then it returns the
// encrypted data in a byte array.
// plainText   The byte array form userid/password to encrypt.
// initVector  The byte array which is used to calculate the
// encryption token.
// targetPublicKey   DERBY' public key.
// Returns the encrypted data in a byte array.
public byte[] encryptData(byte[] plainText, int securityMechanism, byte[] initVector, byte[] targetPublicKey) throws SqlException {
    byte[] cipherText = null;
    Key key = null;
    if (token_ == null) {
        token_ = calculateEncryptionToken(securityMechanism, initVector);
    }
    try {
        if (secKey_ == null) {
            // use this encryption key to initiate a SecretKeySpec object
            secKey_ = generatePrivateKey(targetPublicKey);
            SecretKeySpec desKey = new SecretKeySpec(secKey_, "DES");
            key = desKey;
        } else {
            // use this encryption key to initiate a SecretKeySpec object
            DESKeySpec desKey = new DESKeySpec(secKey_);
            if (secretKeyFactory_ == null) {
                secretKeyFactory_ = SecretKeyFactory.getInstance("DES", providerName);
            }
            key = secretKeyFactory_.generateSecret(desKey);
        }
        // We use DES in CBC mode because this is the mode used in PROTOCOL. The
        // encryption mode has to be consistent for encryption and decryption.
        // CBC mode requires an initialization vector(IV) parameter. In CBC mode
        // we need to initialize the Cipher object with an IV, which can be supplied
        // using the javax.crypto.spec.IvParameterSpec class.
        Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding", providerName);
        // generate a IVParameterSpec object and use it to initiate the
        // Cipher object.
        IvParameterSpec ivParam = new IvParameterSpec(token_);
        // initiate the Cipher using encryption mode, encryption key and the
        // IV parameter.
        cipher.init(Cipher.ENCRYPT_MODE, key, ivParam);
        // Execute the final phase of encryption
        cipherText = cipher.doFinal(plainText);
    } catch (NoSuchPaddingException e) {
        throw new SqlException(agent_.logWriter_, new ClientMessageId(SQLState.CRYPTO_NO_SUCH_PADDING));
    } catch (BadPaddingException e) {
        throw new SqlException(agent_.logWriter_, new ClientMessageId(SQLState.CRYPTO_BAD_PADDING));
    } catch (IllegalBlockSizeException e) {
        throw new SqlException(agent_.logWriter_, new ClientMessageId(SQLState.CRYPTO_ILLEGAL_BLOCK_SIZE));
    } catch (GeneralSecurityException e) {
        throw new SqlException(agent_.logWriter_, new ClientMessageId(SQLState.SECURITY_EXCEPTION_ENCOUNTERED), e);
    }
    return cipherText;
}