[英]Length of data to decrypt is Invalid
我一直在研究嘗試使用Rijndael C#庫進行解密時遇到的問題。 我已經嘗試了一些已發布在此處的解決方案,但似乎沒有一個可行或適用。
問題:我正在嘗試解密從硬件發送的HTTP請求。 但是,我沒有將HTTP請求轉換為與我的解密方法匹配的正確字節數(我認為這是問題嗎?)。
這是我的代碼:
System.Text.Encoding enc = System.Text.Encoding.ASCII;
System.Text.Encoding req = System.Text.Encoding.ASCII;
if (curContext != null)
{
string decrypted = "";
int totalBytes = curContext.Request.TotalBytes;
StreamReader sr = new StreamReader(curContext.Request.InputStream);
string request = sr.ReadToEnd();
if (!String.IsNullOrEmpty(request))
{
using (RijndaelManaged myRijndael = new RijndaelManaged())
{
myRijndael.Mode = CipherMode.ECB;
myRijndael.Padding = PaddingMode.None;
byte[] key = enc.GetBytes(WebConfigurationManager.AppSettings["32B"].ToString());
myRijndael.KeySize = 256;
myRijndael.Key = key;
decrypted = DecryptStringFromBytes(req.GetBytes(request), myRijndael.Key);
}
}
}
和解密方法:
static string DecryptStringFromBytes(byte[] cipherText, byte[] Key)
{
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.Mode = CipherMode.ECB;
rijAlg.Padding = PaddingMode.None;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor();
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
}
在srDecrypt.ReadToEnd()上,我得到標題中所述的錯誤消息。
我對此很陌生,所以我不確定我要去哪里。 任何意見,將不勝感激。 謝謝〜!
“從字符串到字符串到字節的流”轉換順序感覺很錯誤。 確保確實需要這樣做,而不是簡單地從響應中讀取字節。
請在Decrypt方法的底部嘗試此操作:
int plainByteCount = int.MinValue;
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
plainBytes = new byte[cipherText.Length];
plainByteCount = cryptoStream.Read(plainBytes, 0, plainBytes.Length);
}
}
string plainText = Encoding.UTF8.GetString(plainBytes, 0, plainByteCount);
return plainText;
我想我可能已經找到您的問題了。 根據StreamReader
的構造StreamReader
,默認編碼為UTF8Encoding
。 嘗試使用其他構造函數重載並傳遞ASCII編碼:
StreamReader sr = new StreamReader(
curContext.Request.InputStream, Encoding.ASCII);
string request = sr.ReadToEnd();
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