changed.对启动器重构的尝试

LanMountainDesktop.Launcher/Update/UpdateHash.cs

@@ -0,0 +1,84 @@
+using System.Security.Cryptography;
+
+namespace LanMountainDesktop.Launcher.Update;
+
+internal static class UpdateHash
+{
+    public static string ComputeSha256Hex(string filePath)
+    {
+        using var stream = File.OpenRead(filePath);
+        var hash = SHA256.HashData(stream);
+        return Convert.ToHexString(hash).ToLowerInvariant();
+    }
+
+    public static byte[] ComputeSha512(string filePath)
+    {
+        using var stream = File.OpenRead(filePath);
+        return SHA512.HashData(stream);
+    }
+
+    public static bool TryParseHashBytes(string? rawHash, out byte[] bytes)
+    {
+        bytes = [];
+        if (string.IsNullOrWhiteSpace(rawHash))
+        {
+            return false;
+        }
+
+        var normalized = rawHash.Trim();
+        var separator = normalized.IndexOf(':');
+        if (separator >= 0 && separator < normalized.Length - 1)
+        {
+            normalized = normalized[(separator + 1)..].Trim();
+        }
+
+        var compact = normalized.Replace("-", string.Empty);
+        if (compact.Length > 0 && compact.Length % 2 == 0 && IsHexString(compact))
+        {
+            try
+            {
+                bytes = Convert.FromHexString(compact);
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        try
+        {
+            bytes = Convert.FromBase64String(normalized);
+            return bytes.Length > 0;
+        }
+        catch
+        {
+            return false;
+        }
+    }
+
+    public static string NormalizeHashText(string hash)
+    {
+        var normalized = hash.Trim();
+        var separator = normalized.IndexOf(':');
+        if (separator >= 0 && separator < normalized.Length - 1)
+        {
+            normalized = normalized[(separator + 1)..];
+        }
+
+        return normalized.Replace("-", string.Empty).Trim().ToLowerInvariant();
+    }
+
+    private static bool IsHexString(string value)
+    {
+        foreach (var ch in value)
+        {
+            if (!Uri.IsHexDigit(ch))
+            {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}