質問編集履歴
2
codeラベルを使用して、PHPとC#のソースを記述しました。
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test
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@@ -100,6 +100,342 @@
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C#でのXOR暗号化のソースは以下の物になります。
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```C#
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace updatebinfile
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{
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class Program
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{
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static string SQLPath = "/home/sql/";
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static string binPath = "/home/sql/binfile/";
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static private byte[] Byte_Key = { 0xB5, 0x1A, 0x3, 0xF3, 0x7F, 0x42, 0xD3 };
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static int offset = 0;
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static void Main(string[] args)
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{
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String[] FileName = Directory.GetFiles(SQLPath);
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foreach(String file in FileName)
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{
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if (!file.Contains(".txt"))
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{
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String UpdateFile = Encrypt(file);
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if(File.Exists(binPath + Path.GetFileName(UpdateFile)))
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{
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File.Delete(binPath + Path.GetFileName(UpdateFile));
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}
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File.Move(UpdateFile, binPath + Path.GetFileName(UpdateFile));
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}
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}
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}
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static private void CreateBinFile(String FileName)
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{
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}
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static private String Encrypt(String FileName)
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{
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String file = System.String.Empty;
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offset = 0;
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//拡張子を判定
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{
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String[] split = FileName.Split('.');
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String extension = "." + split[split.Length - 1];
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file = ReplaceLast(FileName, extension, ".bin");
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}
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//読み込み開始
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{
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List<String> list = new List<String>();
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using (System.IO.StreamReader cReader = new System.IO.StreamReader(FileName, new System.Text.UTF8Encoding(false)))
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{
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while (!cReader.EndOfStream)
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{
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list.Add(cReader.ReadLine());
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}
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}
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{
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//既に出力先に同名のファイルがある場合は削除しておく
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System.IO.FileInfo cFileInfo = new System.IO.FileInfo(file);
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// ファイルを削除する
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cFileInfo.Delete();
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}
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using (System.IO.BinaryWriter write = new BinaryWriter(File.OpenWrite(file), new System.Text.UTF8Encoding(false)))
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{
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foreach (String str in list)
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{
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write.Write(XOR_EnCrypt(str));
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write.Write(XOR_EnCrypt("\n"));
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}
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}
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//書き込み終わったので、復号化してlistに入ってある要素と違いが無いかを確認する
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{
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String str = XOR_getDecryptString(file);
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String[] split = str.Split('\n');
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int str_offset = 0;
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foreach (String line in list)
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{
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if (!line.Equals(split[str_offset++]))
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{
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MessageBox.Show("XOR暗号化エラー\n出力ファイルと元ファイルで差異があります\n" + line + "\n" + split[str_offset], "NotCheckUploadServer", MessageBoxButtons.OK, MessageBoxIcon.Error);
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}
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}
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while (split.Length > str_offset)
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{
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String checkString = split[str_offset++];
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if (checkString.Length != 0)
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{
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MessageBox.Show("XOR暗号化エラー\n出力ファイルと元ファイルで差異があります\n" + "[" + checkString + "]", "NotCheckUploadServer", MessageBoxButtons.OK, MessageBoxIcon.Error);
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}
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}
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}
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}
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return file;
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}
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private static String ReplaceLast(String str, String key, String val)
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{
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int last = str.LastIndexOf(key);
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if (last != -1)
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{
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//StringBuilderを作成する
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System.Text.StringBuilder sb = new System.Text.StringBuilder(str);
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sb.Replace(key, val, last, str.Length - last);
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return sb.ToString();
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}
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return str;
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}
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private static byte[] XOR_EnCrypt(String text)
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{
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byte[] byte_text = new System.Text.UTF8Encoding(false).GetBytes(text);
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for (int i = 0; i < byte_text.Length; i++)
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{
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byte_text[i] ^= Byte_Key[offset++ % Byte_Key.Length];
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}
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return byte_text;
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}
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373
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private static string XOR_getDecryptString(String FileName)
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{
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offset = 0;
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380
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381
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List<byte> list = new List<byte>();
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382
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383
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try
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384
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385
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{
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386
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387
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using (System.IO.BinaryReader read = new BinaryReader(File.OpenRead(FileName)))
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388
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389
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{
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390
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391
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long length = read.BaseStream.Length;
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392
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393
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394
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395
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for (long i = 0; i < length; ++i)
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396
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397
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{
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398
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399
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list.Add(XOR_Decrypt(read.ReadByte()));
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400
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401
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}
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402
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403
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}
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404
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405
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}
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406
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407
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catch (Exception e)
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408
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409
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{
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410
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411
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MessageBox.Show("エラーA:\n" + e.Message, "ERR");
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412
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413
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}
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414
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415
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return new System.Text.UTF8Encoding(false).GetString(list.ToArray());
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416
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417
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}
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418
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419
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420
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421
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private static byte XOR_Decrypt(byte text)
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422
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423
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{
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424
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425
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return (text ^= Byte_Key[offset++ % Byte_Key.Length]);
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426
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427
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}
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428
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429
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}
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430
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431
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}
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432
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433
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434
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435
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```
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436
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437
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+
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438
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+
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103
439
|
上記のPHPを動作させるとbinファイルは正常に作成され、データも同じ容量なのですが、WinMergeなどで見てみるとバイナリデータに大量の差分がありました。
|
|
104
440
|
|
|
105
441
|
|
1
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -15,6 +15,10 @@
|
|
|
15
15
|
上記のサイトを参考にして、以下のように実装いたしました。
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16
16
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17
17
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18
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19
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20
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21
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```PHP
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|
18
22
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19
23
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<?php
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|
20
24
|
|
|
@@ -82,8 +86,6 @@
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82
86
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83
87
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$string[$i] = ($string[$i] ^ $key[$i % strlen($key)]);
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84
88
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85
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-
$string[$i] = ($string[$i] ^ $key[$i % strlen($key)]);
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86
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-
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87
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}
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88
90
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89
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return $string;
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|
@@ -92,7 +94,9 @@
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92
94
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93
95
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94
96
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97
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+
?
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|
98
|
+
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|
95
|
-
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|
99
|
+
```
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|
96
100
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97
101
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98
102
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