c# - RijndaelManaged false 解密结果
问题描述
我有一个问题，我试图自己解决它，但我不能。我的程序从目录中搜索 als .txt 文件。然后它读取文件并加密每个文件并覆盖旧文件。这很好用。现在我想解密txt文件，会发生以下情况：
在这里你可以看到加密的文本和解密的文本
所以问题是，.txt 文件被加密了，解密也有效，但是当我解密时没有原始文本。你可以在图片上看到它，只有有线字母。我不明白为什么，我使用相同的盐和相同的密码。
这是我的代码：
前 3 个片段用于加密，另外 3 个片段用于解密。
foreach (var file in d2.GetFiles("*.txt"))
{
Console.WriteLine(file.FullName, file.Name);
string temppfad = file.FullName;
StreamReader sr = new StreamReader(temppfad);
string Inhalt = sr.ReadToEnd();
Console.WriteLine(Inhalt + "\n");
string Verschlüsselterinhalt = Verschlüsseln(Password, Inhalt);
sr.Close();
File.WriteAllText(temppfad, Verschlüsselterinhalt);
}
这些部分仍然有效，只需上传它以更好地理解它。
加密部分：
static string Verschlüsseln(string PW, string original)
{
using (RijndaelManaged myRijndael = new RijndaelManaged())
{
myRijndael.GenerateKey();
myRijndael.GenerateIV();
byte[] salt = Encoding.ASCII.GetBytes("0PQUX76U0adfaDADFexA888887Dz3J3X");
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(PW, salt);
myRijndael.Key = key.GetBytes(myRijndael.KeySize / 8);
myRijndael.IV = key.GetBytes(myRijndael.BlockSize / 8);
// Encrypt the string to an array of bytes.
byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);
StringBuilder s = new StringBuilder();
foreach (byte item in encrypted)
{
s.Append(item.ToString("X2") + " ");
}
Console.WriteLine("Encrypted: " + s + "\n\n");
return s.ToString();
}
}
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
rijAlg.Mode = CipherMode.CBC;
rijAlg.Padding = PaddingMode.Zeros;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
// Return the encrypted bytes from the memory stream.
return encrypted;
}
我认为到那时一切都很好，现在我将发布解密部分。
foreach (var file in d2.GetFiles("*.txt"))
{
Console.WriteLine(file.FullName, file.Name);
string temppfad = file.FullName;
StreamReader sr = new StreamReader(temppfad);
string Inhalt = sr.ReadToEnd();
Console.WriteLine("Inhalt: " + Inhalt + "\n");
string Entschlüsselterinhalt = Entschlüsseln(Password, Inhalt);
sr.Close();
File.WriteAllText(temppfad, Entschlüsselterinhalt);
}
static string Entschlüsseln(string PW, string original)
{
using (RijndaelManaged myRijndael = new RijndaelManaged())
{
myRijndael.GenerateKey();
myRijndael.GenerateIV();
byte[] salt = Encoding.ASCII.GetBytes("0PQUX76U0adfaDADFexA888887Dz3J3X");
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(PW, salt);
myRijndael.Key = key.GetBytes(myRijndael.KeySize / 8);
myRijndael.IV = key.GetBytes(myRijndael.BlockSize / 8);
// Decrypt the bytes to a string.
byte[] originalbytes = Encoding.ASCII.GetBytes(original);
string decrypted = DecryptStringFromBytes(originalbytes, myRijndael.Key, myRijndael.IV);
//Display the original data and the decrypted data.
Console.WriteLine("Decrypted: " + decrypted);
return decrypted;
}
}
static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
rijAlg.Mode = CipherMode.CBC;
rijAlg.Padding = PaddingMode.Zeros;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
// 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();
}
}
}
}
return plaintext;
}
当有人可以帮助我时，我会很高兴。
更新！！！
我现在编辑了我的代码，现在看起来是这样的：
foreach (var file in d2.GetFiles("*.txt"))
{
Console.WriteLine(file.FullName, file.Name);
string temppfad = file.FullName;
StreamReader sr = new StreamReader(temppfad);
string Inhalt = sr.ReadToEnd();
Console.WriteLine(Inhalt + "\n");
byte[] Verschlüsselterinhalt = Verschlüsseln(Password, Inhalt);
sr.Close();
File.WriteAllBytes(temppfad, Verschlüsselterinhalt);
}
static byte[] Verschlüsseln(string PW, string original)
{
using (RijndaelManaged myRijndael = new RijndaelManaged())
{
byte[] salt = Encoding.ASCII.GetBytes("0PQUX76U0adfaDADFexA888887Dz3J3X");
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(PW, salt);
myRijndael.Key = key.GetBytes(myRijndael.KeySize / 8);
myRijndael.IV = key.GetBytes(myRijndael.BlockSize / 8);
// Encrypt the string to an array of bytes.
byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);
return encrypted;
}
}
我认为那部分没问题，现在解密时出现错误
foreach (var file in d2.GetFiles("*.txt"))
{
Console.WriteLine(file.FullName, file.Name);
string temppfad = file.FullName;
StreamReader sr = new StreamReader(temppfad);
string Inhalt = sr.ReadToEnd();
Console.WriteLine("Inhalt: " + Inhalt + "\n");
string Entschlüsselterinhalt = Entschlüsseln(Password, Inhalt);
sr.Close();
File.WriteAllText(temppfad, Entschlüsselterinhalt);
}
static string Entschlüsseln(string PW, string original)
{
using (RijndaelManaged myRijndael = new RijndaelManaged())
{
byte[] salt = Encoding.ASCII.GetBytes("0PQUX76U0adfaDADFexA888887Dz3J3X");
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(PW, salt);
myRijndael.Key = key.GetBytes(myRijndael.KeySize / 8);
myRijndael.IV = key.GetBytes(myRijndael.BlockSize / 8);
// Decrypt the bytes to a string.
byte[] originalbytes = Encoding.ASCII.GetBytes(original);
string decrypted = DecryptStringFromBytes(originalbytes, myRijndael.Key, myRijndael.IV);
//Display the original data and the decrypted data.
Console.WriteLine("Decrypted: " + decrypted);
return decrypted;
}
}
错误出现在这里：
这里有完整的代码：
static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
rijAlg.Mode = CipherMode.CBC;
rijAlg.Padding = PaddingMode.Zeros;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
// 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();
}
}
}
}
return plaintext;
}
问候
解决方案
问题是您这样做会弄乱加密文本
StringBuilder s = new StringBuilder();
foreach (byte item in encrypted)
{
s.Append(item.ToString("X2") + " ");
}
正如 Damien 提到的，您应该从中返回一个字节数组static string Verschlüsseln(string PW, string original)并用于File.WriteAllBytes将其写入文件。然后，您可以使用File.ReadAllBytes从文件中读取它并将 byte[] 传递给您的解密方法，并且您不需要对编码做任何事情。
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