stringencryptor.cs

这是可以加密&解密字符串

using System.Security.Cryptography;
using System.IO;

namespace GTT
{
    public class StringEncryptor : StringCrypto
    {
        /// <remarks>
        /// 使用.Net SymmetricAlgorithm 类的构造器.
        /// </remarks>
        public StringEncryptor(SymmProvEnum netSelected)
            : base(netSelected)
        {
        }
        /// <remarks>
        /// 使用自定义SymmetricAlgorithm类的构造器.
        /// </remarks>
        public StringEncryptor(SymmetricAlgorithm ServiceProvider)
            : base(ServiceProvider)
        {
        }

        public override string Execute(string source)
        {
            byte[] bytIn = System.Text.ASCIIEncoding.ASCII.GetBytes(source);
            byte[] bytOut = Encrypting(bytIn);
            int i = 0;
            for (i = 0; i < bytOut.Length; i++)
            {
                if (bytOut[i] == 0)
                {
                    break;
                }
            }
            return System.Convert.ToBase64String(bytOut, 0, i);
        }

        private byte[] Encrypting(byte[] Source)
        {
            // create a MemoryStream so that the process can be done without I/O files 
            System.IO.MemoryStream ms = new System.IO.MemoryStream();

            byte[] bytKey = GetLegalKey(Key);

            // set the private key 
            _mobjCryptoService.Key = bytKey;
            _mobjCryptoService.IV = bytKey;

            // create an Encryptor from the Provider Service instance 
            ICryptoTransform encrypto = _mobjCryptoService.CreateEncryptor();

            // create Crypto Stream that transforms a stream using the encryption 
            CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);

            // write out encrypted content into MemoryStream 
            cs.Write(Source, 0, Source.Length);
            cs.FlushFinalBlock();

            // get the output and trim the ''\0'' bytes 
            byte[] bytOut = ms.GetBuffer();

            // convert into Base64 so that the result can be used in xml 
            return bytOut;
        }
    }
}