TLSharp and Tests

2026-04-05 06:26:44 +00:00 · 2015-09-28 10:01:17 +08:00 · 2015-09-28 10:01:17 +08:00 · 3bb487a194
commit 3bb487a194
parent 9cf850e9b8
39 changed files with 21943 additions and 0 deletions
--- a/TLSharp.Core/MTProto/Crypto/RSA.cs
+++ b/TLSharp.Core/MTProto/Crypto/RSA.cs
@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Security.Cryptography;
+
+namespace TLSharp.Core.MTProto.Crypto {
+
+    class RSAServerKey {
+
+        private string fingerprint;
+        private BigInteger m;
+        private BigInteger e;
+
+        public RSAServerKey(string fingerprint, BigInteger m, BigInteger e) {
+            this.fingerprint = fingerprint;
+            this.m = m;
+            this.e = e;
+        }
+
+        public byte[] Encrypt(byte[] data, int offset, int length) {
+            
+            using(MemoryStream buffer = new MemoryStream(255))
+            using(BinaryWriter writer = new BinaryWriter(buffer)) {
+                using(SHA1 sha1 = new SHA1Managed()) {
+                    byte[] hashsum = sha1.ComputeHash(data, offset, length);
+					writer.Write(hashsum);
+                }
+
+                buffer.Write(data, offset, length);
+                if(length < 235) {
+                    byte[] padding = new byte[235 - length];
+                    new Random().NextBytes(padding);
+                    buffer.Write(padding, 0, padding.Length);
+                }
+
+                byte[] ciphertext = new BigInteger(1, buffer.ToArray()).ModPow(e, m).ToByteArrayUnsigned();
+
+                if(ciphertext.Length == 256) {
+                    return ciphertext;
+                } else {
+                    byte[] paddedCiphertext = new byte[256];
+                    int padding = 256 - ciphertext.Length;
+                    for(int i = 0; i < padding; i++) {
+                        paddedCiphertext[i] = 0;
+                    }
+                    ciphertext.CopyTo(paddedCiphertext, padding);
+					return paddedCiphertext;
+                }
+            }
+
+        }
+    }
+    public class RSA {
+        private static readonly Dictionary<string, RSAServerKey> serverKeys = new Dictionary<string, RSAServerKey>() {
+            { "216be86c022bb4c3", new RSAServerKey("216be86c022bb4c3", new BigInteger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new BigInteger("010001", 16)) }
+        };
+
+        public static byte[] Encrypt(string fingerprint, byte[] data, int offset, int length) {
+            string fingerprintLower = fingerprint.ToLower();
+            if(!serverKeys.ContainsKey(fingerprintLower)) {
+                return null;
+            }
+
+            RSAServerKey key = serverKeys[fingerprintLower];
+
+            return key.Encrypt(data, offset, length);
+        }
+    }
+    
+}