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Encryption class public + Methods table
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Wizou 2025-10-10 20:27:42 +02:00
parent a5323eaa86
commit 48d005b605
3 changed files with 23 additions and 15 deletions
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12
src/Encryption.cs
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@ -13,7 +13,7 @@ using static WTelegram.Compat;
namespace WTelegram
{
internal static class Encryption
public static class Encryption
{
private static readonly Dictionary<long, RSAPublicKey> PublicKeys = [];
internal static readonly RandomNumberGenerator RNG = RandomNumberGenerator.Create();
@ -237,6 +237,8 @@ namespace WTelegram
throw new WTException("g^a or g^b is not between 2^{2048-64} and dh_prime - 2^{2048-64}");
}
/// <summary>Load a specific Telegram server public key</summary>
/// <param name="pem">A string starting with <c>-----BEGIN RSA PUBLIC KEY-----</c></param>
public static void LoadPublicKey(string pem)
{
using var rsa = RSA.Create();
@ -319,7 +321,7 @@ j4WcDuXc2CTHgH8gFTNhp/Y8/SpDOhvn9QIDAQAB
}
#if OBFUSCATION
internal sealed class AesCtr(byte[] key, byte[] ivec) : IDisposable
public sealed class AesCtr(byte[] key, byte[] ivec) : IDisposable
{
readonly ICryptoTransform _encryptor = AesECB.CreateEncryptor(key, null);
readonly byte[] _ecount = new byte[16];
@ -327,9 +329,9 @@ j4WcDuXc2CTHgH8gFTNhp/Y8/SpDOhvn9QIDAQAB
public void Dispose() => _encryptor.Dispose();
public void EncryptDecrypt(byte[] buffer, int length)
public void EncryptDecrypt(Span<byte> buffer)
{
for (int i = 0; i < length; i++)
for (int i = 0; i < buffer.Length; i++)
{
if (_num == 0)
{
@ -373,7 +375,7 @@ j4WcDuXc2CTHgH8gFTNhp/Y8/SpDOhvn9QIDAQAB
var sendCtr = new AesCtr(sendKey, sendIV);
var recvCtr = new AesCtr(recvKey, recvIV);
var encrypted = (byte[])preamble.Clone();
sendCtr.EncryptDecrypt(encrypted, 64);
sendCtr.EncryptDecrypt(encrypted);
for (int i = 56; i < 64; i++)
preamble[i] = encrypted[i];
return (sendCtr, recvCtr, preamble);