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
}
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