C#使用RSA加密解密文件

萧瑟 2019年9月8日21:43:39 评论 17

加密代码：

//加密代码，注意会覆盖原文件，里面有我的公钥，你要用时记得覆盖我的公钥
private bool encryptFile(string filename)
{
FileStream f;
try
{
f = new FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
}
catch
{
return false;
}
Random r = new Random();
Thread.Sleep(10*r.Next(3,8));
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);
rsa.FromXmlString("<RSAKeyValue><Modulus>w7nNT8U7kwTw8UqLk0lROxmfTRZnQrMH1QrNyUGtoeAJ3w+iH08j+h83cPWxwPoxpXm1cgCLFWtCFWY1rkQDCCLxJhUIwYTbGKTg9h0uUVfNxGiNji7dcHShd01UYpZjHCwOar1wjJD4vJqVJCk++59UUMhE9IUATuSUVpRy1bE=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>");
//导入密钥
byte[] data = new byte[16];
ArrayList con = new ArrayList();
while(f.Read(data, 0, 16)!=0)
{
byte[] result = rsa.Encrypt(data,false);
//Thread.Sleep(10 * r.Next(2, 7));
con.Add(result);
}
//加密
f.Seek(0, SeekOrigin.Begin);
foreach(byte[] d in con)
{
f.Write(d, 0, d.Length);
}
f.Close();
return true;
}

解密代码：

//解密代码，覆盖原文件，返回值表示是否解密成功
private bool decryptFile(string filename,string key)
{
FileStream f;
try
{
f = new FileStream(filename, FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
}
catch
{
return false;
}
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(1024);
try
{
rsa.FromXmlString(key);
}
catch
{
return false;
}
byte[] data = new byte[128];
ArrayList con = new ArrayList();
while (f.Read(data, 0, 128) != 0)
{
byte[] result;
try
{
result = rsa.Decrypt(data, false);
}
catch
{
return false;
}
con.Add(result);
}
//解密
f.SetLength(con.Count * 16);
f.Seek(0, SeekOrigin.Begin);
foreach (byte[] d in con)
{
f.Write(d, 0, d.Length);
}
f.Close();
return true;
}

微信公众号

博客微信公众号，欢迎关注。