65 lines
2.7 KiB
C#
65 lines
2.7 KiB
C#
using System;
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using System.Security.Cryptography;
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using KKdMainLib.IO;
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using MSIO = System.IO;
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namespace KKdMainLib
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{
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public static class DIVAFILE
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{
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private static readonly byte[] Key = "file access deny".ToASCII();
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public static void Decrypt(this string file)
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{
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Console.Title = "DIVAFILE Decrypt - File: " + Path.GetFileName(file);
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Stream reader = File.OpenReader(file);
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if (reader.ReadInt64() != 0x454C494641564944)
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{ reader.Close(); return; }
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int StreamLenght = reader.ReadInt32();
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int FileLenght = reader.ReadInt32();
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byte[] decrypted = new byte[StreamLenght];
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reader.Seek(0, 0);
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using (AesManaged crypto = new AesManaged())
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{
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crypto.Key = Key; crypto.IV = new byte[16];
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crypto.Mode = CipherMode.ECB; crypto.Padding = PaddingMode.Zeros;
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using (CryptoStream cryptoData = new CryptoStream(reader.BaseStream,
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crypto.CreateDecryptor(crypto.Key, crypto.IV), CryptoStreamMode.Read))
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cryptoData.Read(decrypted, 0, StreamLenght);
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}
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Stream writer = File.OpenWriter(file, FileLenght);
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for (int i = 0x10; i < StreamLenght && i < FileLenght + 0x10; i++)
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writer.Write(decrypted[i]);
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writer.Close();
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}
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public static void Encrypt(this string file)
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{
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Console.Title = "DIVAFILE Encrypt - File: " + Path.GetFileName(file);
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Stream reader = File.OpenReader(file);
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int FileLenghtOrigin = reader.Length;
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int FileLenght = FileLenghtOrigin.Align(16);
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reader.Close();
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byte[] In = File.OpenReader(file).ToArray(true);
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byte[] Inalign = new byte[FileLenght];
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for (int i = 0; i < In.Length; i++) Inalign[i] = In[i];
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In = null;
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byte[] encrypted = new byte[FileLenght];
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using (AesManaged crypto = new AesManaged())
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{
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crypto.Key = Key; crypto.IV = new byte[16];
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crypto.Mode = CipherMode.ECB; crypto.Padding = PaddingMode.Zeros;
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using (CryptoStream cryptoData = new CryptoStream(new MSIO.MemoryStream(Inalign),
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crypto.CreateEncryptor(crypto.Key, crypto.IV), CryptoStreamMode.Read))
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cryptoData.Read(encrypted, 0, FileLenght);
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}
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Stream writer = File.OpenWriter(file, Inalign.Length);
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writer.Write(0x454C494641564944);
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writer.Write(FileLenght);
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writer.Write(FileLenghtOrigin);
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writer.Write(encrypted);
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writer.Close();
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}
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}
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}
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