我试图加密和解密使用上一个RijndaelManaged的套接字文件流,但我一直碰到异常长度无效
CryptographicException: Length of the data to decrypt is invalid. at System.Security.Cryptography.RijndaelManagedTransform.TransformFinalBlock(Byte[] inputBuffer, Int32 inputOffset, Int32 inputCount) at System.Security.Cryptography.CryptoStream.FlushFinalBlock() at System.Security.Cryptography.CryptoStream.Dispose(Boolean disposing)
唯一的例外是在年底抛出receiveFile中的使用语句,当整个文件已被传输时。
我试过在网上搜索,但只找到了加密和解密单个字符串时使用编码时出现的问题的答案。我使用FileStream,所以我没有指定任何使用的编码,所以这不应该是问题。这些是我的方法:
private void transferFile(FileInfo file, long position, long readBytes)
{
// transfer on socket stream
Stream stream = new FileStream(file.FullName, FileMode.Open);
if (position > 0)
{
stream.Seek(position, SeekOrigin.Begin);
}
// if this should be encrypted, wrap the encryptor stream
if (UseCipher)
{
stream = new CryptoStream(stream, streamEncryptor, CryptoStreamMode.Read);
}
using (stream)
{
int read;
byte[] array = new byte[8096];
while ((read = stream.Read(array, 0, array.Length)) > 0)
{
streamSocket.Send(array, 0, read, SocketFlags.None);
position += read;
}
}
}
private void receiveFile(FileInfo transferFile)
{
byte[] array = new byte[8096];
// receive file
Stream stream = new FileStream(transferFile.FullName, FileMode.Append);
if (UseCipher)
{
stream = new CryptoStream(stream, streamDecryptor, CryptoStreamMode.Write);
}
using (stream)
{
long position = new FileInfo(transferFile.Path).Length;
while (position < transferFile.Length)
{
int maxRead = Math.Min(array.Length, (int)(transferFile.Length - position));
int read = position < array.Length
? streamSocket.Receive(array, maxRead, SocketFlags.None)
: streamSocket.Receive(array, SocketFlags.None);
stream.Write(array, 0, read);
position += read;
}
}
}
这是我用来设置密码的方法。 byte [] init是一个生成的字节数组。
private void setupStreamCipher(byte[] init)
{
RijndaelManaged cipher = new RijndaelManaged();
cipher.KeySize = cipher.BlockSize = 256; // bit size
cipher.Mode = CipherMode.ECB;
cipher.Padding = PaddingMode.ISO10126;
byte[] keyBytes = new byte[32];
byte[] ivBytes = new byte[32];
Array.Copy(init, keyBytes, 32);
Array.Copy(init, 32, ivBytes, 0, 32);
streamEncryptor = cipher.CreateEncryptor(keyBytes, ivBytes);
streamDecryptor = cipher.CreateDecryptor(keyBytes, ivBytes);
}
任何人有一个想法,我可能会做错什么?
的FlushFinalBlock()方法被调用在using语句
我将改变CipherMode的“关闭部分”,我刚刚进入它作为一个例子,所以你知道,我不初始化我的密码在任何“怪异”的方式。 sendFile()中的readBytes尚未使用,我忘记删除它。我读到文件末尾,所以这不应该成为问题。 我以为 正在照顾填充?我可以改变什么来使它工作? – Patrick 2009-06-03 12:02:26如果加密流处于读取模式,那么如果您放弃它,最后的块将会丢失;它必须从其基础源流中实际读取文件结尾以产生最终块。 – 2009-06-03 16:43:55