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some renaming

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Wizou 2022-01-25 23:16:28 +01:00
parent 733d106265
commit 582027e800
2 changed files with 9 additions and 9 deletions
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2
FAQ.md
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@ -23,7 +23,7 @@ If you need to manage these user accounts in parallel, you can create multiple i
and give them a Config callback that will select a different session file ;
for example: `new WTelegram.Client(what => Config(what, "session42"))`
Also please note that the session files are encrypted with your api_hash, so if you change it, the existing session files can't be read anymore.
Also please note that the session files are encrypted with your api_hash (or session_key), so if you change it, the existing session files can't be read anymore.
Your api_id/api_hash represents your application, and shouldn't change with each user account the application will manage.
<a name="GUI"></a>

16
src/Session.cs
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@ -40,10 +40,10 @@ namespace WTelegram
private readonly SHA256 _sha256 = SHA256.Create();
private FileStream _fileStream;
private int _nextPosition;
private byte[] _apiHash; // used as AES key for encryption of session file
private byte[] _rgbKey; // 32-byte encryption key
private static readonly Aes aes = Aes.Create();
internal static Session LoadOrCreate(string pathname, byte[] apiHash)
internal static Session LoadOrCreate(string pathname, byte[] rgbKey)
{
var header = new byte[8];
var fileStream = new FileStream(pathname, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None, 1); // no buffering
@ -58,10 +58,10 @@ namespace WTelegram
fileStream.Position = position;
if (fileStream.Read(input, 0, length) != length)
throw new ApplicationException($"Can't read session block ({position}, {length})");
var session = Load(input, apiHash);
var session = Load(input, rgbKey);
session._fileStream = fileStream;
session._nextPosition = position + length;
session._apiHash = apiHash;
session._rgbKey = rgbKey;
Helpers.Log(2, "Loaded previous session");
return session;
}
@ -70,15 +70,15 @@ namespace WTelegram
throw new ApplicationException($"Exception while reading session file: {ex.Message}\nDelete the file to start a new session", ex);
}
}
return new Session { _fileStream = fileStream, _nextPosition = 8, _apiHash = apiHash };
return new Session { _fileStream = fileStream, _nextPosition = 8, _rgbKey = rgbKey };
}
internal void Dispose() => _fileStream.Dispose();
internal static Session Load(byte[] input, byte[] apiHash)
internal static Session Load(byte[] input, byte[] rgbKey)
{
using var sha256 = SHA256.Create();
using var decryptor = aes.CreateDecryptor(apiHash, input[0..16]);
using var decryptor = aes.CreateDecryptor(rgbKey, input[0..16]);
var utf8Json = decryptor.TransformFinalBlock(input, 16, input.Length - 16);
if (!sha256.ComputeHash(utf8Json, 32, utf8Json.Length - 32).SequenceEqual(utf8Json[0..32]))
throw new ApplicationException("Integrity check failed in session loading");
@ -91,7 +91,7 @@ namespace WTelegram
var finalBlock = new byte[16];
var output = new byte[(16 + 32 + utf8Json.Length + 16) & ~15];
Encryption.RNG.GetBytes(output, 0, 16);
using var encryptor = aes.CreateEncryptor(_apiHash, output[0..16]);
using var encryptor = aes.CreateEncryptor(_rgbKey, output[0..16]);
encryptor.TransformBlock(_sha256.ComputeHash(utf8Json), 0, 32, output, 16);
encryptor.TransformBlock(utf8Json, 0, utf8Json.Length & ~15, output, 48);
utf8Json.AsSpan(utf8Json.Length & ~15).CopyTo(finalBlock);