Merge branch 'main' of https://github.com/kingsznhone/NCMDump.NET

kingsznhone · Apr 17, 2024 · abe3ac2 · abe3ac2
2 parents 50ce24a + ed55dc3
commit abe3ac2
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Showing 6 changed files with 41 additions and 35 deletions.
diff --git a/README.md b/README.md
@@ -30,6 +30,8 @@ Add WinUI 3 Publish.
 
 Async optimize on RC4 Stream
 
+Add linux Support
+
 
 ### v2.2.0 2024.03.24
 

diff --git a/src/NCMDumpCLI/NCMDumpCLI.csproj b/src/NCMDumpCLI/NCMDumpCLI.csproj
@@ -10,6 +10,7 @@
     <ApplicationManifest>app.manifest</ApplicationManifest>
 	<Version>2.3.0</Version>	
 	<Platforms>x64</Platforms>
+	<PublishAot>False</PublishAot>
   </PropertyGroup>
 
 

diff --git a/src/NCMDumpCore/NCMDumper.cs b/src/NCMDumpCore/NCMDumper.cs
@@ -11,8 +11,8 @@ namespace NCMDumpCore
     public class NCMDumper
     {
         private readonly int vectorSize = Vector256<byte>.Count;
-        private readonly byte[] coreKey = { 0x68, 0x7A, 0x48, 0x52, 0x41, 0x6D, 0x73, 0x6F, 0x35, 0x6B, 0x49, 0x6E, 0x62, 0x61, 0x78, 0x57 };
-        private readonly byte[] metaKey = { 0x23, 0x31, 0x34, 0x6C, 0x6A, 0x6B, 0x5F, 0x21, 0x5C, 0x5D, 0x26, 0x30, 0x55, 0x3C, 0x27, 0x28 };
+        private readonly byte[] coreKey = [0x68, 0x7A, 0x48, 0x52, 0x41, 0x6D, 0x73, 0x6F, 0x35, 0x6B, 0x49, 0x6E, 0x62, 0x61, 0x78, 0x57];
+        private readonly byte[] metaKey = [0x23, 0x31, 0x34, 0x6C, 0x6A, 0x6B, 0x5F, 0x21, 0x5C, 0x5D, 0x26, 0x30, 0x55, 0x3C, 0x27, 0x28];
 
         private bool VerifyHeader(ref MemoryStream ms)
         {
@@ -35,7 +35,7 @@ private byte[] ReadRC4Key(ref MemoryStream ms)
             ms.Read(buffer);
 
             //SIMD XOR 0x64
-            Vector256<byte> xor = Vector256.Create(0x64646464).AsByte();
+            Vector256<byte> xor = Vector256.Create((byte)0x64);
             int i;
             for (i = 0; i <= buffer.Length - vectorSize; i += vectorSize)
             {
@@ -49,11 +49,13 @@ private byte[] ReadRC4Key(ref MemoryStream ms)
             }
 
             // decrypt keybox data
-            using (var decrypter = new AesCng() { Key = coreKey, Mode = CipherMode.ECB }.CreateDecryptor())
+            using (Aes aes = Aes.Create())
             {
-                buffer = decrypter.TransformFinalBlock(buffer.ToArray(), 0, buffer.Length).Skip(17).ToArray(); // 17 = len("neteasecloudmusic")
+                aes.Mode = CipherMode.ECB;
+                aes.Key = coreKey;
+                var cleanText = aes.DecryptEcb(buffer.ToArray(), PaddingMode.PKCS7).ToArray()[17..];
+                return cleanText;
             }
-            return buffer.ToArray();
         }
 
         private MetaInfo ReadMeta(ref MemoryStream ms)
@@ -65,7 +67,7 @@ private MetaInfo ReadMeta(ref MemoryStream ms)
             ms.Read(buffer);
 
             //SIMD XOR 0x63
-            Vector256<byte> xor = Vector256.Create(0x63636363).AsByte();
+            Vector256<byte> xor = Vector256.Create((byte)0x63);
             int i;
             for (i = 0; i <= buffer.Length - vectorSize; i += vectorSize)
             {
@@ -81,21 +83,23 @@ private MetaInfo ReadMeta(ref MemoryStream ms)
             buffer = System.Convert.FromBase64String(Encoding.ASCII.GetString(buffer.ToArray()[22..]));
 
             // decrypt meta data which is a json contains info of the song
-            using (var cryptor = new AesCng() { Key = metaKey, Mode = CipherMode.ECB }.CreateDecryptor())
+            using (Aes aes = Aes.Create())
             {
-                buffer = cryptor.TransformFinalBlock(buffer.ToArray(), 0, buffer.Length);
-                var MetaJsonString = Encoding.UTF8.GetString(buffer).Replace("music:", "");
+                aes.Mode = CipherMode.ECB;
+                aes.Key = metaKey;
+                var cleanText = aes.DecryptEcb(buffer.ToArray(), PaddingMode.PKCS7);
+                var MetaJsonString = Encoding.UTF8.GetString(cleanText[6..]);
                 MetaInfo metainfo = JsonSerializer.Deserialize<MetaInfo>(MetaJsonString);
                 return metainfo;
             }
         }
 
         private async Task<byte[]> ReadAudioData(MemoryStream ms, byte[] Key)
         {
-            using (RC4_NCM_Stream rc4s = new RC4_NCM_Stream(ms, Key))
+            using (RC4_NCM_Stream rc4s = new(ms, Key))
             {
                 byte[] data = new byte[ms.Length - ms.Position];
-                Memory<byte> m_data = new Memory<byte>(data);
+                Memory<byte> m_data = new(data);
                 await rc4s.ReadAsync(m_data);
                 return data;
             }
@@ -122,7 +126,7 @@ private void AddTag(string fileName, byte[]? ImgData, MetaInfo metainfo)
                 }
             }
 
-            //Add more infomation
+            //Add more information
             tagfile.Tag.Title = metainfo.musicName;
             tagfile.Tag.Performers = metainfo.artist.Select(x => x[0]).ToArray();
             tagfile.Tag.Album = metainfo.album;
@@ -132,7 +136,7 @@ private void AddTag(string fileName, byte[]? ImgData, MetaInfo metainfo)
 
         private byte[]? FetchUrl(Uri uri)
         {
-            HttpClient client = new HttpClient();
+            HttpClient client = new();
             try
             {
                 var response = client.GetAsync(uri).Result;
@@ -182,7 +186,7 @@ public async Task<bool> ConvertAsync(string path)
             }
 
             //Read all bytes to ram.
-            MemoryStream ms = new MemoryStream(await System.IO.File.ReadAllBytesAsync(path));
+            MemoryStream ms = new(await System.IO.File.ReadAllBytesAsync(path));
 
             //Verify Header
             if (!VerifyHeader(ref ms))
@@ -201,9 +205,7 @@ public async Task<bool> ConvertAsync(string path)
             MetaInfo metainfo = ReadMeta(ref ms);
 
             //CRC32 Check
-            var crc32bytes = new byte[4];
-            ms.Read(crc32bytes, 0, crc32bytes.Length);
-            var crc32len = MemoryMarshal.Read<int>(crc32bytes);
+            uint crc32 = ReadUint32(ref ms);
 
             // skip 5 character,
             ms.Seek(5, SeekOrigin.Current);
@@ -226,16 +228,15 @@ public async Task<bool> ConvertAsync(string path)
             byte[] AudioData = await ReadAudioData(ms, RC4Key);
 
             //Flush Audio Data to disk drive
-            string OutputPath = path.Substring(0, path.LastIndexOf("."));
+            string OutputPath = path[..path.LastIndexOf('.')];
 
             string format = metainfo.format;
             if (format is null or "") format = "mp3";
             await System.IO.File.WriteAllBytesAsync($"{OutputPath}.{format}", AudioData);
 
             //Add tag and cover
             await Task.Run(() => AddTag($"{OutputPath}.{format}", ImageData, metainfo));
-            ms.Flush();
-            ms.Close();
+            await ms.DisposeAsync();
             return true;
         }
     }

diff --git a/src/NCMDumpCore/RC4_NCM.cs b/src/NCMDumpCore/RC4_NCM.cs
@@ -2,7 +2,7 @@
 {
     public class RC4_NCM
     {
-        private byte[] Keybox;
+        private readonly byte[] Keybox;
         private int i = 0, j = 0;
 
         public RC4_NCM(byte[] key)
@@ -19,7 +19,7 @@ public RC4_NCM(byte[] key)
 
         public byte[] Encrypt(byte[] data)
         {
-            Span<byte> span = new Span<byte>(data);
+            Span<byte> span = new(data);
             Encrypt(ref span);
             return span.ToArray();
         }

diff --git a/src/NCMDumpCore/RC4_NCM_Stream.cs b/src/NCMDumpCore/RC4_NCM_Stream.cs
@@ -1,9 +1,9 @@
 namespace NCMDumpCore
 {
-    internal class RC4_NCM_Stream : Stream
+    public class RC4_NCM_Stream : Stream
     {
-        private Stream innerStream;
-        private RC4_NCM rc4;
+        private readonly Stream innerStream;
+        private readonly RC4_NCM rc4;
 
         public RC4_NCM_Stream(Stream innerStream, byte[] key)
         {
@@ -73,16 +73,16 @@ public override void SetLength(long value)
 
         public override void Write(byte[] buffer, int offset, int count)
         {
-            Span<byte> span = buffer[offset..(offset + count)];
-            int bytesWrite = rc4.Encrypt(ref span);
+            Span<byte> span = buffer.AsSpan(offset, count);
+            rc4.Encrypt(ref span);
             innerStream.Write(span);
         }
 
         public override void Write(ReadOnlySpan<byte> buffer)
         {
             Span<byte> span = new byte[buffer.Length];
             buffer.CopyTo(span);
-            int bytesWrite = rc4.Encrypt(ref span);
+            rc4.Encrypt(ref span);
 
             innerStream.Write(buffer);
         }
@@ -91,15 +91,15 @@ public override async Task WriteAsync(byte[] data, int offset, int count, Cancel
         {
             byte[] buffer = data[offset..(offset + count)];
             byte[] encrypted = await Task.Run(() => rc4.Encrypt(buffer));
-            await innerStream.WriteAsync(encrypted);
+            await innerStream.WriteAsync(encrypted, cancellationToken);
             return;
         }
 
         public override async ValueTask WriteAsync(ReadOnlyMemory<byte> data, CancellationToken cancellationToken = default)
         {
             byte[] buffer = data.ToArray();
             await Task.Run(() => rc4.Encrypt(buffer));
-            await innerStream.WriteAsync(buffer);
+            await innerStream.WriteAsync(buffer, cancellationToken);
             return;
         }
     }

diff --git a/src/NCMDumpGUI/MainWindowViewModel.cs b/src/NCMDumpGUI/MainWindowViewModel.cs
@@ -71,7 +71,7 @@ public MainWindowViewModel(NCMDumper _core)
             Core = _core;
             WillDeleteNCM = true;
             ApplicationTitle = "NCMDump.NET";
-            NCMCollection = new();
+            NCMCollection = [];
             AddFolderCommand = new AsyncRelayCommand(FolderDialog);
             AddFileCommand = new AsyncRelayCommand(FileDialog);
             ClearCommand = new AsyncRelayCommand(ClearList, () => NCMCollection.Count > 0);
@@ -191,9 +191,11 @@ private async Task FolderDialog()
 
         private async Task FileDialog()
         {
-            Microsoft.Win32.OpenFileDialog ofp = new();
-            ofp.Multiselect = true;
-            ofp.Filter = "NCM File(*.ncm)|*.ncm";
+            Microsoft.Win32.OpenFileDialog ofp = new()
+            {
+                Multiselect = true,
+                Filter = "NCM File(*.ncm)|*.ncm"
+            };
             if (ofp.ShowDialog() == true)
             {
                 foreach (string file in ofp.FileNames)