.net使用des加密算法

来源：互联网发布：ch341a编程器软件1.30 编辑：程序博客网时间：2024/04/28 12:13

String desKey = "BFYB_KEY";//键

String desIV = "BFYB_IIV";//向量

/// <summary>

/// DES加密
/// </summary>
/// <param name="originText"></param>
/// <returns></returns>
public String desEncode(String originText)
{
byte[] tmpDesKey = System.Text.ASCIIEncoding.ASCII.GetBytes(desKey);
byte[] tmpDesIV = System.Text.ASCIIEncoding.ASCII.GetBytes(desIV);
//
DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();
MemoryStream memStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memStream, desProvider.CreateEncryptor(tmpDesKey, tmpDesIV), CryptoStreamMode.Write);

StreamWriter streamWriter = new StreamWriter(cryptoStream);
streamWriter.Write(originText);
streamWriter.Flush();
cryptoStream.FlushFinalBlock();
streamWriter.Flush();
String retStr = Convert.ToBase64String(memStream.GetBuffer(), 0, (int)memStream.Length);

return retStr;
}
/// <summary>
/// DES解密
/// </summary>
/// <param name="originText"></param>
/// <returns></returns>
public String desDecode(String originText)
{
byte[] tmpDesKey = System.Text.ASCIIEncoding.ASCII.GetBytes(desKey);
byte[] tmpDesIV = System.Text.ASCIIEncoding.ASCII.GetBytes(desIV);
//
byte[] originBytes;
try
{
originText.Replace("_%_", "/");
originText.Replace("-%-", "#");
originBytes = Convert.FromBase64String(originText);
}
catch(Exception exception)
{
return null;
}
DESCryptoServiceProvider desProvider = new DESCryptoServiceProvider();
MemoryStream memStream = new MemoryStream(originBytes);
CryptoStream cryptoStream = new CryptoStream(memStream, desProvider.CreateDecryptor(tmpDesKey, tmpDesIV), CryptoStreamMode.Read);
StreamReader steamReader = new StreamReader(cryptoStream);
String retString = steamReader.ReadToEnd();

return retString;
}

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