Baseline: Ausgangszustand vor Modularisierung

Erster Commit des bestehenden monolithischen WinForms-Copytraders, inklusive der Alt-Backups (*.bak), damit diese dauerhaft in der Historie rekonstruierbar bleiben. Threema-Lib unter libs/ wurde vendored (nested .git entfernt). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-01 13:16:16 +02:00
commit 475d396f80
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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using IcgSoftware.Threema.CoreMsgApi.Exceptions;
+
+namespace IcgSoftware.Threema.CoreMsgApi
+{
+	/// <summary>
+	/// Encapsulates an asymmetric key, either public or private.
+	/// </summary>
+	public class Key
+	{
+		public static readonly char separator = ':';
+
+		public static class KeyType
+		{
+			public const string PRIVATE = "private";
+			public const string PUBLIC = "public";
+		}
+
+		public byte[] key;
+		public string type;
+
+		public Key(string type, byte[] key)
+		{
+			this.key = key;
+			this.type = type;
+		}
+
+
+		/// <summary>
+		/// Decodes and validates an encoded key.
+		/// Encoded key format: type:hex_key
+		/// </summary>
+		/// <param name="encodedKey">an encoded key</param>
+		/// <returns></returns>
+		public static Key DecodeKey(string encodedKey)
+		{
+			// Split key and check length
+			string[] keyArray = encodedKey.Split(Key.separator);
+			if (keyArray.Length != 2)
+			{
+				throw new InvalidKeyException("Does not contain a valid key format");
+			}
+
+			// Unpack key
+			string keyType = keyArray[0];
+			string keyContent = keyArray[1];
+
+			// Is this a valid hex key?
+			if (!Regex.IsMatch(keyContent, "[0-9a-fA-F]{64}"))
+			{
+				throw new InvalidKeyException("Does not contain a valid key");
+			}
+
+			return new Key(keyType, DataUtils.HexStringToByteArray(keyContent));
+		}
+
+		/// <summary>
+		/// Decodes and validates an encoded key.
+		/// Encoded key format: type:hex_key
+		/// </summary>
+		/// <param name="encodedKey">an encoded key</param>
+		/// <param name="expectedKeyType">the expected type of the key</param>
+		/// <returns></returns>
+		public static Key DecodeKey(String encodedKey, String expectedKeyType)
+		{
+			Key key = DecodeKey(encodedKey);
+
+			// Check key type
+			if (!key.type.Equals(expectedKeyType))
+			{
+				throw new InvalidKeyException("Expected key type: " + expectedKeyType + ", got: " + key.type);
+			}
+
+			return key;
+		}
+
+		/// <summary>
+		/// Encodes a key.
+		/// </summary>
+		/// <returns>an encoded key</returns>
+		public String Encode()
+		{
+			return this.type + Key.separator + DataUtils.ByteArrayToHexString(this.key);
+		}
+	}
+}