我正在尝试使用 RSA 和 C# 加密然后解密 XML 文件，虽然我真的很接近，但有一个问题。一旦它被解密，几乎所有的文件都在那里，但在最后会有一个小问题。它要么是文件末尾的间隙，要么是更多数据附加到文件的末尾。
这是我的加密方法：
public static bool Encrypt(ProcessingHolder ph)
{
FileInfo inFile = ph.encryptedFI;
FileInfo outFile = ph.unEncryptedFI;
X509Certificate2 daCert = new X509Certificate2(keyFP, daCertPassword);
RSACryptoServiceProvider RSA = (RSACryptoServiceProvider)daCert.PrivateKey;
bool done = false;
FileStream fs = null;
FileStream fso = null;
try
{
//opens the file to encrypt into a filestream object
fs = inFile.OpenRead();
//240 is what the iOS side is using
//algorithm that calculates max bytes ((KeySize - 384) / 8) + 37
//(returns 245)
int chunkSize = 245;
fso = outFile.OpenWrite();
byte[] buffer = new byte[chunkSize];
int totalRead = 0;
while (totalRead < fs.Length)
{
int readBytes = fs.Read(buffer,0, chunkSize);
totalRead += readBytes;
//check to see if the final chunk of data is less than 245 so as not to write empty buffer
if (readBytes < chunkSize) buffer = new byte[readBytes];
//byte[] encr = new byte[readBytes];
//actual encryption
//encr = RSA.Encrypt(buffer, false);
byte[] encr = RSA.Encrypt(buffer, false);
fso.Write(encr, 0, encr.Length);
}
fso.Flush();
fso.Close();
fs.Close();
done = true;
}
catch (Exception ex)
{
Debug.WriteLine("Decrypt failed with message " + ex.Message);
done = false;
}
finally
{
if (fs != null) fs.Close();
if (fso != null) fso.Close();
}
return done;
}
}
这是我的解密方法：
public static bool Decrypt(ProcessingHolder ph)
{
FileInfo inFile = ph.encryptedFI;
FileInfo outFile = ph.unEncryptedFI;
X509Certificate2 daCert = new X509Certificate2(keyFP, daCertPassword);
RSACryptoServiceProvider RSA = (RSACryptoServiceProvider)daCert.PrivateKey;
bool done = false;
FileStream fs = null;
FileStream fso = null;
try
{
fs = inFile.OpenRead();
int chunkSize = 256;
fso = outFile.OpenWrite();
byte[] buffer = new byte[chunkSize];
int totalRead = 0;
while (totalRead < fs.Length)
{
int readBytes = fs.Read(buffer, 0, chunkSize);
totalRead += readBytes;
//check to see if the final chunk of data is less than 245 so as not to write empty buffer
//if (readBytes < chunkSize) buffer = new byte[readBytes];
byte[] decr = RSA.Decrypt(buffer, false);
fso.Write(decr, 0, decr.Length);
}
fso.Flush();
fso.Close();
fs.Close();
done = true;
}
catch (Exception ex)
{
Debug.WriteLine("Decrypt failed with message " + ex.Message);
done = false;
}
finally
{
if (fs != null) fs.Close();
if (fso != null) fso.Close();
}
return done;
}
在这里把我的头撞到墙上，提前谢谢