字符串加密，解密一例

 

.net 里面提供了丰富的加密解密东东，这里只不过用了一个。

public class StringDEProvider
    {
        #region 内部字段

        private SymmetricAlgorithm mCSP;

        /// <summary>
        /// 密钥|注：必须长度12
        /// </summary>
        private const string CIV = "MoLiQingCha=";
        /// <summary>
        /// 初始化向量|注：必须长度12
        /// </summary>
        private const string CKEY = "Xingmai0216=";

        #endregion

        #region 实例构造函数

        public StringDEProvider()
        {
            mCSP = new DESCryptoServiceProvider();
        }

        #endregion

        #region 实例方法

        /// <summary>
        /// 加密字符串
        /// </summary>
        /// <param name="Value"></param>
        /// <returns></returns>
        public string EncryptString(string Value)
        {
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;

            ct = mCSP.CreateEncryptor(Convert.FromBase64String(CKEY), Convert.FromBase64String(CIV));

            byt = Encoding.UTF8.GetBytes(Value);

            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();

            cs.Close();

            return Convert.ToBase64String(ms.ToArray());
        }

        /// <summary>
        /// 解密字符串
        /// </summary>
        /// <param name="Value"></param>
        /// <returns></returns>
        public string DecryptString(string Value)
        {
            ICryptoTransform ct;
            MemoryStream ms;
            CryptoStream cs;
            byte[] byt;

            ct = mCSP.CreateDecryptor(Convert.FromBase64String(CKEY), Convert.FromBase64String(CIV));

            byt = Convert.FromBase64String(Value);

            ms = new MemoryStream();
            cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
            cs.Write(byt, 0, byt.Length);
            cs.FlushFinalBlock();

            cs.Close();

            return Encoding.UTF8.GetString(ms.ToArray());
        }

        #endregion
    }