我在使用下面的代码时遇到了一些问题。我在临时位置有一个需要加密的文件,这个函数会加密那些存储在“pathToSave”位置的数据。
在检查时似乎没有正确处理整个文件 - 我的输出中缺少一些内容,我怀疑它与while循环没有在整个流中运行有关。
顺便说一句,如果我尝试在while循环后调用CryptStrm.Close(),我会收到异常。这意味着如果我尝试解密文件,我会得到一个已经在使用的文件错误!
尝试了所有平常和我在这里看到类似的问题,任何帮助都会很棒。
由于
public void EncryptFile(String tempPath, String pathToSave)
{
try
{
FileStream InputFile = new FileStream(tempPath, FileMode.Open, FileAccess.Read);
FileStream OutputFile = new FileStream(pathToSave, FileMode.Create, FileAccess.Write);
RijndaelManaged RijCrypto = new RijndaelManaged();
//Key
byte[] Key = new byte[32] { ... };
//Initialisation Vector
byte[] IV = new byte[32] { ... };
RijCrypto.Padding = PaddingMode.None;
RijCrypto.KeySize = 256;
RijCrypto.BlockSize = 256;
RijCrypto.Key = Key;
RijCrypto.IV = IV;
ICryptoTransform Encryptor = RijCrypto.CreateEncryptor(Key, IV);
CryptoStream CryptStrm = new CryptoStream(OutputFile, Encryptor, CryptoStreamMode.Write);
int data;
while (-1 != (data = InputFile.ReadByte()))
{
CryptStrm.WriteByte((byte)data);
}
}
catch (Exception EncEx)
{
throw new Exception("Encoding Error: " + EncEx.Message);
}
}
编辑:
我假设我的问题在于加密。我的解密可能是罪魁祸首
public String DecryptFile(String encryptedFilePath)
{
FileStream InputFile = new FileStream(encryptedFilePath, FileMode.Open, FileAccess.Read);
RijndaelManaged RijCrypto = new RijndaelManaged();
//Key
byte[] Key = new byte[32] { ... };
//Initialisation Vector
byte[] IV = new byte[32] { ... };
RijCrypto.Padding = PaddingMode.None;
RijCrypto.KeySize = 256;
RijCrypto.BlockSize = 256;
RijCrypto.Key = Key;
RijCrypto.IV = IV;
ICryptoTransform Decryptor = RijCrypto.CreateDecryptor(Key, IV);
CryptoStream CryptStrm = new CryptoStream(InputFile, Decryptor, CryptoStreamMode.Read);
String OutputFilePath = Path.GetTempPath() + "myfile.name";
StreamWriter OutputFile = new StreamWriter(OutputFilePath);
OutputFile.Write(new StreamReader(CryptStrm).ReadToEnd());
CryptStrm.Close();
OutputFile.Close();
return OutputFilePath;
}
答案 0 :(得分:14)
嗯,这里有几个问题。
<击> 1。你设置IV的大小太大了。如果密钥大小为256,则Rijndael的IV为16字节。如果您尝试设置的字符数多于字节数,则会出现异常。 IV大小应设置为Block size / 8 see MSDN,因此您的IV大小是正确的。
我发布了一些使用内存流的示例代码来显示加密和解密。
var tempData = "This is the text to encrypt. It's not much, but it's all there is.";
using (var rijCrypto = new RijndaelManaged())
{
byte[] encryptedData;
rijCrypto.Padding = System.Security.Cryptography.PaddingMode.ISO10126;
rijCrypto.KeySize = 256;
using (var input = new MemoryStream(Encoding.Unicode.GetBytes(tempData)))
using (var output = new MemoryStream())
{
var encryptor = rijCrypto.CreateEncryptor();
using (var cryptStream = new CryptoStream(output, encryptor, CryptoStreamMode.Write))
{
var buffer = new byte[1024];
var read = input.Read(buffer, 0, buffer.Length);
while (read > 0)
{
cryptStream.Write(buffer, 0, read);
read = input.Read(buffer, 0, buffer.Length);
}
cryptStream.FlushFinalBlock();
encryptedData = output.ToArray();
}
}
using (var input = new MemoryStream(encryptedData))
using (var output = new MemoryStream())
{
var decryptor = rijCrypto.CreateDecryptor();
using (var cryptStream = new CryptoStream(input, decryptor, CryptoStreamMode.Read))
{
var buffer = new byte[1024];
var read = cryptStream.Read(buffer, 0, buffer.Length);
while (read > 0)
{
output.Write(buffer, 0, read);
read = cryptStream.Read(buffer, 0, buffer.Length);
}
cryptStream.Flush();
var result = Encoding.Unicode.GetString(output.ToArray());
}
}
}
答案 1 :(得分:2)
读取CryptoStream的另一种方法是使用CopyTo方法:
@Service
答案 2 :(得分:0)
必须首先指定KeySize。这看起来像一个错误可行
using (var aes = new AesManaged())
{
aes.KeySize = 256;
aes.Mode = CipherMode.CBC;
aes.IV = iv;
aes.Key = passwordHash;
aes.Padding = PaddingMode.PKCS7;
但这不是
using (var aes = new AesManaged())
{
aes.Mode = CipherMode.CBC;
aes.IV = iv;
aes.Key = passwordHash;
aes.Padding = PaddingMode.PKCS7;
aes.KeySize = 256;