Java DES 加解密（”DES/EBC/NoPadding”）详解编程语言

private static final Cipher DES_CIPHER; 
 
static { 
    try { 
        DES_CIPHER = Cipher.getInstance("DES/ECB/NoPadding"); 
    } catch (NoSuchAlgorithmException | NoSuchPaddingException e) { 
        throw Throwables.propagate(e); 
    } 
} 
 
public static String encryptDES(String encryptString, String encryptKey) { 
    try { 
        DES_CIPHER.init(Cipher.ENCRYPT_MODE, new SecretKeySpec(encryptKey.getBytes(IcbcConstant.ENCODING_GBK), "DES")); 
        byte[] encryptedData = DES_CIPHER.doFinal(encryptString.getBytes(IcbcConstant.ENCODING_GBK)); 
        return new String(encryptedData, IcbcConstant.ENCODING_GBK); 
    } catch (Throwable e) { 
        throw Throwables.propagate(e); 
    } 
} 
 
public static String decryptDES(String decryptString, String decryptKey) { 
    try { 
        DES_CIPHER.init(Cipher.DECRYPT_MODE, new SecretKeySpec(decryptKey.getBytes(IcbcConstant.ENCODING_GBK), "DES")); 
        byte decryptedData[] = DES_CIPHER.doFinal(decryptString.getBytes(IcbcConstant.ENCODING_GBK)); 
        return new String(decryptedData, IcbcConstant.ENCODING_GBK); 
    } catch (Throwable e) { 
        throw Throwables.propagate(e); 
    } 
}

 private static byte[] formatData(String str) { 
        int yu = str.length() % 8; 
        if (yu == 0) { 
            return str.getBytes(Charset.forName(Constants.Charset)); 
        } 
        int size = 8 - yu; 
        byte[] arr = new byte[str.length() + size]; 
        byte[] data = str.getBytes(Charset.forName(Constants.Charset)); 
        int i = 0; 
        for (; i < data.length; i++) { 
            arr[i] = data[i]; 
        } 
        for (int j = 0; j < size; j++, i++) { 
            arr[i] = ' '; 
        } 
        return arr; 
    } 
 
    private static byte[] formatByte(byte[] arr) { 
        int i = 0; 
        for (; i < arr.length; i++) { 
            if ((char) arr[i] == ' ') { 
                break; 
            } 
        } 
        byte[] result = new byte[i]; 
        System.arraycopy(arr, 0, result, 0, i); 
        return result; 
    }