Des对称可逆加密

/// <summary>

/// DES AES Blowfish

///  对称加密算法的优点是速度快，

///  缺点是密钥管理不方便，要求共享密钥。

/// 可逆对称加密  密钥长度8

/// </summary>

using System.Security.Cryptography;

public class DesEncrypt

{

//8位长度

private static string KEY = "ruanmou1";

private static byte[] rgbKey = ASCIIEncoding.ASCII.GetBytes(KEY.Substring(0, 8));

private static byte[] rgbIV = ASCIIEncoding.ASCII.GetBytes(KEY.Insert(0, "w").Substring(0, 8));

/// <summary>

/// DES 加密

/// </summary>

/// <param name="strValue"></param>

/// <returns></returns>

public static string Encrypt(string strValue)

{

DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();

using (MemoryStream memStream = new MemoryStream())

{

CryptoStream crypStream = new CryptoStream(memStream, dsp.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

StreamWriter sWriter = new StreamWriter(crypStream);

sWriter.Write(strValue);

sWriter.Flush();

crypStream.FlushFinalBlock();

memStream.Flush();

return Convert.ToBase64String(memStream.GetBuffer(), 0, (int)memStream.Length);

}

}

/// <summary>

/// DES解密

/// </summary>

/// <param name="EncValue"></param>

/// <returns></returns>

public static string Decrypt(string EncValue)

{

DESCryptoServiceProvider dsp = new DESCryptoServiceProvider();

byte[] buffer = Convert.FromBase64String(EncValue);

using (MemoryStream memStream = new MemoryStream())

{

CryptoStream crypStream = new CryptoStream(memStream, dsp.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);

crypStream.Write(buffer, 0, buffer.Length);

crypStream.FlushFinalBlock();

return ASCIIEncoding.UTF8.GetString(memStream.ToArray());

}

}

}

string desEn1 = DesEncrypt.Encrypt("张三李四");

string desDe1 = DesEncrypt.Decrypt(desEn1);