Java和.net加密解密互通DES

Java代码：

public static String encrypt(String data, String key) throws Exception {
Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); 
 
        DESKeySpec desKeySpec = new DESKeySpec(key.substring(0, 8).getBytes("UTF-8")); 
 
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); 
        SecretKey secretKey = keyFactory.generateSecret(desKeySpec); 
        IvParameterSpec iv = new IvParameterSpec(key.substring(0, 8).getBytes("UTF-8")); 
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv); 
 
        return new BASE64Encoder().encode(cipher.doFinal(data.getBytes("UTF-8"))); 
}

public static String decrypt(String data, String key) throws IOException,
Exception {
if (data == null)
return "";
BASE64Decoder decoder = new BASE64Decoder();

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

DESKeySpec desKeySpec = new DESKeySpec(key.substring(0, 8).getBytes(
"UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey secretKey = keyFactory.generateSecret(desKeySpec);
IvParameterSpec iv = new IvParameterSpec(key.substring(0, 8).getBytes(
"UTF-8"));
cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);
byte[] retByte = cipher.doFinal(decoder.decodeBuffer(data));
return new String(retByte);
}

.net代码：

public static string DESEncrypt(string data, string desKey)
        {
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                byte[] inputByteArray = Encoding.UTF8.GetBytes(data);
                des.Key = Encoding.UTF8.GetBytes(desKey.Substring(0, 8));
                des.IV = Encoding.UTF8.GetBytes(desKey.Substring(0, 8));
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Convert.ToBase64String(ms.ToArray());
                ms.Close();
                return str;
            }
        }

        public static string DESDecrypt(string encryedData, string desKey)
        {
            byte[] inputByteArray = Convert.FromBase64String(encryedData);
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                des.Key = Encoding.UTF8.GetBytes(desKey.Substring(0, 8));
                des.IV = Encoding.UTF8.GetBytes(desKey.Substring(0, 8));
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Encoding.UTF8.GetString(ms.ToArray());
                ms.Close();
                return str;
            }
        } 

注意：1.Java密钥为8字节，或8的倍数。

    2.只支持加密字符串为128位以内的字符加密，如果超过128位要分段进行加密