[英]Error while decrypting a bytes array using AES256 C#
I was doing a program for encrypting private files on another computer apart, where this same formula worked correctly, I don't understand why this part of code doesn't work, even though it worked before: 我当时正在编写一个程序,用于加密另一台计算机上的私人文件,在该计算机上,相同的公式正常工作,我不理解为什么这部分代码不起作用,即使以前也可以起作用:
public static byte[] AES_Decrypt(byte[] bytesToBeDecrypted, byte[] passwordBytes)
{
byte[] decryptedBytes = null;
byte[] saltBytes = new byte[] { 2, 0, 0, 4, 0, 3, 0, 3 };
using (MemoryStream ms = new MemoryStream())
{
using (RijndaelManaged AES = new RijndaelManaged())
{
AES.KeySize = 256;
AES.BlockSize = 256;
AES.Padding = PaddingMode.PKCS7;
var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Mode = CipherMode.CFB;
using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
cs.Close();
}
decryptedBytes = ms.ToArray();
}
}
return decryptedBytes;
}
I've been trying to find out for about 2 hours because it gives me that error when decrypting, but counting on the little encryption knowledge that I have have it's absolutely impossible. 我一直试图找出大约2个小时,因为它在解密时会给我这个错误,但是依靠我所拥有的一点加密知识绝对是不可能的。
First of all, when i say ChunkSize i mean ChunkSize, because first of all I split the file into 5Mb bytes array, then i encrypt or decrypt the Byte Array and write the data into the file. 首先,当我说ChunkSize时,我的意思是ChunkSize,因为首先将文件拆分为5Mb字节数组,然后对字节数组进行加密或解密,然后将数据写入文件中。 Problem was, that ChunkSize was like less than 1Mb and thats why CryptographicException arises.
问题是,ChunkSize小于1Mb,这就是为什么CryptographicException出现的原因。
if (File.Exists(FileToDecrypt)) {
byte[] PasswordBytes;
if (IsFileTypePassword) {
PasswordBytes = File.ReadAllBytes(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),"K3ys\\" + PasswordToDecrypt));
} else {
PasswordBytes = Encoding.UTF8.GetBytes(PasswordToDecrypt);
}
DecryptFile(5000000, FileToDecrypt, PasswordBytes); // Here was the problem
DecThread.Abort();
}
And here is the function that splits the file, its a little bit different than mine but it does the same, also this piece of code is grabbed from another Question form StackOverflow. 这是分割文件的函数,它与我的文件有些许不同,但功能相同,这部分代码也是从另一个Question窗体StackOverflow抓取的。
public static void SplitFile(string inputFile, int chunkSize, string path)
{
byte[] buffer = new byte[chunkSize];
using (Stream input = File.OpenRead(inputFile))
{
int index = 0;
while (input.Position < input.Length)
{
using (Stream output = File.Create(path + "\\" + index))
{
int chunkBytesRead = 0;
while (chunkBytesRead < chunkSize)
{
int bytesRead = input.Read(buffer,
chunkBytesRead,
chunkSize - chunkBytesRead);
if (bytesRead == 0)
{
break;
}
chunkBytesRead += bytesRead;
}
output.Write(buffer, 0, chunkBytesRead);
}
index++;
}
}
}
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