使用Rijndael来加密/解密文件 [英] Using Rijndael to encrypt/decrypt files

问题描述

我需要传输xml文件，需要加密。我发现一些例子认为我很接近，但是当我解密文件时，我最终会遇到垃圾字符。有一些关于这个的帖子，但我没有看到任何将会完全有帮助。这是加密和解密代码。

I need to transfer xml files and they are required to be encrypted. I have found some examples think I'm close but when I decrypt the file I end up with trailing junk characters. There are some posts about this but I have not seen any that will exactly help. Here is the encrypt and decrypt code.

private void EncryptFile(string inputFile, string outputFile, string key) {
    try {
        byte[] keyBytes;
        keyBytes = Encoding.Unicode.GetBytes(key);

        Rfc2898DeriveBytes derivedKey = new Rfc2898DeriveBytes(key, keyBytes);

        RijndaelManaged rijndaelCSP = new RijndaelManaged();
        rijndaelCSP.Key = derivedKey.GetBytes(rijndaelCSP.KeySize / 8);
        rijndaelCSP.IV = derivedKey.GetBytes(rijndaelCSP.BlockSize / 8);

        ICryptoTransform encryptor = rijndaelCSP.CreateEncryptor();

        FileStream inputFileStream = new FileStream(inputFile, FileMode.Open, FileAccess.Read);

        byte[] inputFileData = new byte[(int)inputFileStream.Length];
        inputFileStream.Read(inputFileData, 0, (int)inputFileStream.Length);

        FileStream outputFileStream = new FileStream(outputFile, FileMode.Create, FileAccess.Write);

        CryptoStream encryptStream = new CryptoStream(outputFileStream, encryptor, CryptoStreamMode.Write);
        encryptStream.Write(inputFileData, 0, (int)inputFileStream.Length);
        encryptStream.FlushFinalBlock();

        rijndaelCSP.Clear();
        encryptStream.Close();
        inputFileStream.Close();
        outputFileStream.Close();
    }
    catch (Exception ex) {
        MessageBox.Show(ex.Message, "Encryption Failed!", MessageBoxButtons.OK, MessageBoxIcon.Error);
        return;
    }

    MessageBox.Show("File Encryption Complete!");

}

private void DecryptFile(string inputFile, string outputFile, string key) {
    try {
        byte[] keyBytes = Encoding.Unicode.GetBytes(key);

        Rfc2898DeriveBytes derivedKey = new Rfc2898DeriveBytes(key, keyBytes);

        RijndaelManaged rijndaelCSP = new RijndaelManaged();
        rijndaelCSP.Key = derivedKey.GetBytes(rijndaelCSP.KeySize / 8);
        rijndaelCSP.IV = derivedKey.GetBytes(rijndaelCSP.BlockSize / 8);
        ICryptoTransform decryptor = rijndaelCSP.CreateDecryptor();

        FileStream inputFileStream = new FileStream(inputFile, FileMode.Open, FileAccess.Read);

        CryptoStream decryptStream = new CryptoStream(inputFileStream, decryptor, CryptoStreamMode.Read);

        byte[] inputFileData = new byte[(int)inputFileStream.Length];
        decryptStream.Read(inputFileData, 0, (int)inputFileStream.Length);

        FileStream outputFileStream = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
        outputFileStream.Write(inputFileData, 0, inputFileData.Length);
        outputFileStream.Flush();

        rijndaelCSP.Clear();

        decryptStream.Close();
        inputFileStream.Close();
        outputFileStream.Close();
    }
    catch (Exception ex) {
        MessageBox.Show(ex.Message, "Decryption Failed!", MessageBoxButtons.OK, MessageBoxIcon.Error);
        return;
    }

    MessageBox.Show("File Decryption Complete!");
}

我结束了

<?xml version="1.0" encoding="UTF-8"?>
<transaction>
  <header>
    <qOrderNumber></qOrderNumber>
    <qRequestDate></qRequestDate>
    <testOrder></testOrder>
    <qCustomerNumber></qCustomerNumber>
    <transactionStatus></transactionStatus>
  </header>
  <lines>
    <line>
      <productID></productID>
      <serialNumber></serialNumber>
    </line>
    <line> 
      <productID></productID>
      <serialNumber></serialNumber>
    </line>
  </lines>
</transaction>NULNULNULNULNULNUL

推荐答案

解密，注意从CryptoStream.Read调用返回值。它告诉您字节数组中解密数据的长度（通常与由于填充而导致的加密数据的长度不匹配）。尝试在解密函数中使用以下内容：

When decrypting, pay attention to the return value from the CryptoStream.Read call. It tells you the length of the decrypted data in your byte array (usually will not match the length of the encrypted data due to padding). Try using the following in your decrypt function:

int decrypt_length = decryptStream.Read(inputFileData, 0, (int)inputFileStream.Length);
FileStream outputFileStream = new FileStream(outputFile, FileMode.Create, FileAccess.Write);
outputFileStream.Write(inputFileData, 0, decrypt_length);

这篇关于使用Rijndael来加密/解密文件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！