C#的DES加密和解密方法

[c#]代码库

/// <summary>
/// 进行DES加密。
/// </summary>
/// <param name="pToEncrypt">要加密的字符串。</param>
/// <param name="sKey">密钥，且必须为8位。</param>
/// <returns>以Base64格式返回的加密字符串。</returns>
public string Encrypt(string pToEncrypt, string sKey)
{
using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
{
byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
cs.Close();
}
string str = Convert.ToBase64String(ms.ToArray());
ms.Close();
return str;
}
}
 
    
// <summary>
// 进行DES解密。
// </summary>
// <param name="pToDecrypt">要解密的以Base64</param>
// <param name="sKey">密钥，且必须为8位。</param>
// <returns>已解密的字符串。</returns>
public string Decrypt(string pToDecrypt, string sKey)
{
 byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);
 using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
 {
 des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
 des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
 System.IO.MemoryStream ms = new System.IO.MemoryStream();
 using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
 {
 cs.Write(inputByteArray, 0, inputByteArray.Length);
 cs.FlushFinalBlock();
 cs.Close();
 }
 string str = Encoding.UTF8.GetString(ms.ToArray());
 ms.Close();
 return str;
 }
}