文件利用对称密钥key加密后，并利用数字证书加密公共密钥，如何将加密后的文件和加密后的KEY连接起来

[tigion]

如题，有代码最好 我邮箱[e-mail] 谢谢了啊

[zhizlm]

[e-mail] 发你邮箱了。

[zhizlm]

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



//加密的方法
public static string jiami(string str, string encryptKey)
{

DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();
byte[] key = Encoding.Unicode.GetBytes(encryptKey);
byte[] data = Encoding.Unicode.GetBytes(str);
System.IO.MemoryStream MStream = new System.IO.MemoryStream();
CryptoStream CStream = new CryptoStream(MStream, descsp.CreateEncryptor(key, key), CryptoStreamMode.Write);
CStream.Write(data, 0, data.Length);
CStream.FlushFinalBlock();
return Convert.ToBase64String(MStream.ToArray());
}

//解密的方法
public static String JieMi(String str, string encryptKey)
{

DESCryptoServiceProvider descsp = new DESCryptoServiceProvider();
byte[] key = Encoding.Unicode.GetBytes(encryptKey);
byte[] data = Convert.FromBase64String(str);
System.IO.MemoryStream MStream = new System.IO.MemoryStream();
CryptoStream CStream = new CryptoStream(MStream, descsp.CreateDecryptor(key, key), CryptoStreamMode.Write);
CStream.Write(data, 0, data.Length);
CStream.FlushFinalBlock();
return Encoding.Unicode.GetString(MStream.ToArray());
}