├── .gitattributes ├── .gitignore ├── KugouDecryption.sln ├── KugouDecryption ├── KgmaDecoder.cs ├── KugouDecryption.csproj ├── Properties │ ├── Resources.Designer.cs │ └── Resources.resx └── kgm.v2.xz ├── LICENSE └── README.md /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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**/*.HTMLClient/GeneratedArtifacts 299 | **/*.DesktopClient/GeneratedArtifacts 300 | **/*.DesktopClient/ModelManifest.xml 301 | **/*.Server/GeneratedArtifacts 302 | **/*.Server/ModelManifest.xml 303 | _Pvt_Extensions 304 | 305 | # Paket dependency manager 306 | .paket/paket.exe 307 | paket-files/ 308 | 309 | # FAKE - F# Make 310 | .fake/ 311 | 312 | # CodeRush personal settings 313 | .cr/personal 314 | 315 | # Python Tools for Visual Studio (PTVS) 316 | __pycache__/ 317 | *.pyc 318 | 319 | # Cake - Uncomment if you are using it 320 | # tools/** 321 | # !tools/packages.config 322 | 323 | # Tabs Studio 324 | *.tss 325 | 326 | # Telerik's JustMock configuration file 327 | *.jmconfig 328 | 329 | # BizTalk build output 330 | *.btp.cs 331 | *.btm.cs 332 | *.odx.cs 333 | *.xsd.cs 334 | 335 | # OpenCover UI analysis results 336 | OpenCover/ 337 | 338 | # Azure Stream Analytics local run output 339 | ASALocalRun/ 340 | 341 | # MSBuild Binary and Structured Log 342 | *.binlog 343 | 344 | # NVidia Nsight GPU debugger configuration file 345 | *.nvuser 346 | 347 | # MFractors (Xamarin productivity tool) working folder 348 | .mfractor/ 349 | 350 | # Local History for Visual Studio 351 | .localhistory/ 352 | 353 | # BeatPulse healthcheck temp database 354 | healthchecksdb 355 | 356 | # Backup folder for Package Reference Convert tool in Visual Studio 2017 357 | MigrationBackup/ 358 | 359 | # Ionide (cross platform F# VS Code tools) working folder 360 | .ionide/ 361 | 362 | # Fody - auto-generated XML schema 363 | FodyWeavers.xsd -------------------------------------------------------------------------------- /KugouDecryption.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 16 4 | VisualStudioVersion = 16.0.31205.134 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "KugouDecryption", "KugouDecryption\KugouDecryption.csproj", "{8AA26E44-880E-49AD-AAAF-C7E6321A716D}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|Any CPU = Debug|Any CPU 11 | Debug|ARM = Debug|ARM 12 | Debug|ARM64 = Debug|ARM64 13 | Debug|x64 = Debug|x64 14 | Debug|x86 = Debug|x86 15 | Release|Any CPU = Release|Any CPU 16 | Release|ARM = Release|ARM 17 | Release|ARM64 = Release|ARM64 18 | Release|x64 = Release|x64 19 | Release|x86 = Release|x86 20 | EndGlobalSection 21 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 22 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU 23 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|Any CPU.Build.0 = Debug|Any CPU 24 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|ARM.ActiveCfg = Debug|Any CPU 25 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|ARM.Build.0 = Debug|Any CPU 26 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|ARM64.ActiveCfg = Debug|Any CPU 27 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|ARM64.Build.0 = Debug|Any CPU 28 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|x64.ActiveCfg = Debug|Any CPU 29 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|x64.Build.0 = Debug|Any CPU 30 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|x86.ActiveCfg = Debug|Any CPU 31 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Debug|x86.Build.0 = Debug|Any CPU 32 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|Any CPU.ActiveCfg = Release|Any CPU 33 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|Any CPU.Build.0 = Release|Any CPU 34 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|ARM.ActiveCfg = Release|Any CPU 35 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|ARM.Build.0 = Release|Any CPU 36 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|ARM64.ActiveCfg = Release|Any CPU 37 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|ARM64.Build.0 = Release|Any CPU 38 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|x64.ActiveCfg = Release|Any CPU 39 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|x64.Build.0 = Release|Any CPU 40 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|x86.ActiveCfg = Release|Any CPU 41 | {8AA26E44-880E-49AD-AAAF-C7E6321A716D}.Release|x86.Build.0 = Release|Any CPU 42 | EndGlobalSection 43 | GlobalSection(SolutionProperties) = preSolution 44 | HideSolutionNode = FALSE 45 | EndGlobalSection 46 | GlobalSection(ExtensibilityGlobals) = postSolution 47 | SolutionGuid = {BF62CE6E-4444-4AD8-A48A-5A22A16BFE7A} 48 | EndGlobalSection 49 | EndGlobal 50 | -------------------------------------------------------------------------------- /KugouDecryption/KgmaDecoder.cs: -------------------------------------------------------------------------------- 1 | using SharpCompress.Compressors.Xz; 2 | using System; 3 | using System.IO; 4 | 5 | namespace KugouDecryption 6 | { 7 | /// 8 | /// 解密kgm/kgma/vpr的静态类 9 | /// 10 | public static class KgmaDecoder 11 | { 12 | /// 13 | /// vpr校验头部 14 | /// 15 | private static ReadOnlySpan VprHeader => new byte[16] { 0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43, 0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31 }; 16 | 17 | /// 18 | /// kgm(a)校验头部 19 | /// 20 | private static ReadOnlySpan KgmHeader => new byte[16] { 0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B, 0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14 }; 21 | 22 | /// 23 | /// vpr文件后期mask 24 | /// 25 | private static ReadOnlySpan MaskVpr => new byte[17] { 0x25, 0xDF, 0xE8, 0xA6, 0x75, 0x1E, 0x75, 0x0E, 0x2F, 0x80, 0xF3, 0x2D, 0xB8, 0xB6, 0xE3, 0x11, 0x00 }; 26 | 27 | /// 28 | /// 先置mask 29 | /// 30 | private static ReadOnlySpan MaskV2 => new byte[] 31 | { 32 | 0xB8, 0xD5, 0x3D, 0xB2, 0xE9, 0xAF, 0x78, 0x8C, 0x83, 0x33, 0x71, 0x51, 0x76, 0xA0, 0xCD, 0x37, 33 | 0x2F, 0x3E, 0x35, 0x8D, 0xA9, 0xBE, 0x98, 0xB7, 0xE7, 0x8C, 0x22, 0xCE, 0x5A, 0x61, 0xDF, 0x68, 34 | 0x69, 0x89, 0xFE, 0xA5, 0xB6, 0xDE, 0xA9, 0x77, 0xFC, 0xC8, 0xBD, 0xBD, 0xE5, 0x6D, 0x3E, 0x5A, 35 | 0x36, 0xEF, 0x69, 0x4E, 0xBE, 0xE1, 0xE9, 0x66, 0x1C, 0xF3, 0xD9, 0x02, 0xB6, 0xF2, 0x12, 0x9B, 36 | 0x44, 0xD0, 0x6F, 0xB9, 0x35, 0x89, 0xB6, 0x46, 0x6D, 0x73, 0x82, 0x06, 0x69, 0xC1, 0xED, 0xD7, 37 | 0x85, 0xC2, 0x30, 0xDF, 0xA2, 0x62, 0xBE, 0x79, 0x2D, 0x62, 0x62, 0x3D, 0x0D, 0x7E, 0xBE, 0x48, 38 | 0x89, 0x23, 0x02, 0xA0, 0xE4, 0xD5, 0x75, 0x51, 0x32, 0x02, 0x53, 0xFD, 0x16, 0x3A, 0x21, 0x3B, 39 | 0x16, 0x0F, 0xC3, 0xB2, 0xBB, 0xB3, 0xE2, 0xBA, 0x3A, 0x3D, 0x13, 0xEC, 0xF6, 0x01, 0x45, 0x84, 40 | 0xA5, 0x70, 0x0F, 0x93, 0x49, 0x0C, 0x64, 0xCD, 0x31, 0xD5, 0xCC, 0x4C, 0x07, 0x01, 0x9E, 0x00, 41 | 0x1A, 0x23, 0x90, 0xBF, 0x88, 0x1E, 0x3B, 0xAB, 0xA6, 0x3E, 0xC4, 0x73, 0x47, 0x10, 0x7E, 0x3B, 42 | 0x5E, 0xBC, 0xE3, 0x00, 0x84, 0xFF, 0x09, 0xD4, 0xE0, 0x89, 0x0F, 0x5B, 0x58, 0x70, 0x4F, 0xFB, 43 | 0x65, 0xD8, 0x5C, 0x53, 0x1B, 0xD3, 0xC8, 0xC6, 0xBF, 0xEF, 0x98, 0xB0, 0x50, 0x4F, 0x0F, 0xEA, 44 | 0xE5, 0x83, 0x58, 0x8C, 0x28, 0x2C, 0x84, 0x67, 0xCD, 0xD0, 0x9E, 0x47, 0xDB, 0x27, 0x50, 0xCA, 45 | 0xF4, 0x63, 0x63, 0xE8, 0x97, 0x7F, 0x1B, 0x4B, 0x0C, 0xC2, 0xC1, 0x21, 0x4C, 0xCC, 0x58, 0xF5, 46 | 0x94, 0x52, 0xA3, 0xF3, 0xD3, 0xE0, 0x68, 0xF4, 0x00, 0x23, 0xF3, 0x5E, 0x0A, 0x7B, 0x93, 0xDD, 47 | 0xAB, 0x12, 0xB2, 0x13, 0xE8, 0x84, 0xD7, 0xA7, 0x9F, 0x0F, 0x32, 0x4C, 0x55, 0x1D, 0x04, 0x36, 48 | 0x52, 0xDC, 0x03, 0xF3, 0xF9, 0x4E, 0x42, 0xE9, 0x3D, 0x61, 0xEF, 0x7C, 0xB6, 0xB3, 0x93, 0x50, 49 | }; 50 | 51 | /// 52 | /// 将源文件数据解密为音频数据 53 | /// 54 | /// 55 | /// 56 | /// 音频数据 57 | public static unsafe byte[] Decode(byte[] buffer) 58 | { 59 | ReadOnlySpan span = buffer ?? throw new ArgumentNullException(nameof(buffer)); 60 | bool vpr = span[..16].SequenceEqual(VprHeader) || (span[..16].SequenceEqual(KgmHeader) ? false : throw new ArgumentException("给定的文件格式不是kgm/kgma/vpr中的一种")); 61 | Span key = stackalloc byte[17]; 62 | span[0x1c..0x2c].CopyTo(key); // 其实就是加一个0到后边去 63 | fixed (byte* ptrBegin = span) 64 | fixed (byte* maskV2Ptr = MaskV2) // 避免边界检查 65 | fixed (byte* keyPtr = key) // 避免边界检查 66 | { 67 | byte* ptr = ptrBegin + 16; 68 | int headerLength = *(int*)ptr; 69 | #if BIGENDIAN 70 | headerLength = BinaryPrimitives.ReverseEndianness(headerLength); 71 | #endif 72 | int length = span.Length - headerLength, 73 | keyLength = (int)((uint)length >> 4) + 1; 74 | if (keyLength > 73155904) 75 | { 76 | throw new NotSupportedException("源文件长度过长"); 77 | } 78 | byte[] result = GC.AllocateUninitializedArray(length); 79 | using (MemoryStream ms = new(Properties.Resources.kgm_v2)) 80 | using (XZStream stream = new(ms)) 81 | { 82 | stream.Read(result.AsSpan()[..keyLength]); 83 | } 84 | ptr = ptrBegin + span.Length; 85 | fixed (byte* resultPtrBegin = result) 86 | { 87 | byte* resultPtrEnd = resultPtrBegin + length, 88 | resultPtr = resultPtrEnd; 89 | int mod17 = length % 17, 90 | mod272 = length % 272; 91 | for (int i = length; i != -1; i--) // 倒过来遍历, 这样子mask可以先往result里边放 92 | { 93 | int med8 = keyPtr[mod17] ^ *ptr--; 94 | med8 ^= (med8 & 0xF) << 4; 95 | int msk8 = maskV2Ptr[mod272] ^ resultPtrBegin[i >> 4]; 96 | msk8 ^= (msk8 & 0xF) << 4; 97 | *resultPtr-- = (byte)(med8 ^ msk8); // 避免边界检查 98 | mod17--; 99 | mod17 += 17 & (mod17 >> 31); // -1的时候置为16 100 | mod272--; 101 | mod272 += 272 & (mod272 >> 31); // -1的时候置为272 102 | } 103 | if (vpr) 104 | { 105 | resultPtr = resultPtrEnd; 106 | fixed (byte* maskVprPtr = MaskVpr) // 避免边界检查 107 | { 108 | mod17 = length % 17; 109 | for (int i = 0; i < length; i++) 110 | { 111 | *resultPtr-- ^= maskVprPtr[mod17]; 112 | mod17 -= 1; 113 | mod17 += 17 & (mod17 >> 31); // -1的时候置为16 114 | } 115 | } 116 | } 117 | } 118 | return result; 119 | } 120 | } 121 | } 122 | } 123 | -------------------------------------------------------------------------------- /KugouDecryption/KugouDecryption.csproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | net5.0 5 | enable 6 | true 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | True 16 | True 17 | Resources.resx 18 | 19 | 20 | 21 | 22 | 23 | ResXFileCodeGenerator 24 | Resources.Designer.cs 25 | 26 | 27 | 28 | 29 | -------------------------------------------------------------------------------- /KugouDecryption/Properties/Resources.Designer.cs: -------------------------------------------------------------------------------- 1 | //------------------------------------------------------------------------------ 2 | // 3 | // This code was generated by a tool. 4 | // Runtime Version:4.0.30319.42000 5 | // 6 | // Changes to this file may cause incorrect behavior and will be lost if 7 | // the code is regenerated. 8 | // 9 | //------------------------------------------------------------------------------ 10 | 11 | namespace KugouDecryption.Properties { 12 | using System; 13 | 14 | 15 | /// 16 | /// A strongly-typed resource class, for looking up localized strings, etc. 17 | /// 18 | // This class was auto-generated by the StronglyTypedResourceBuilder 19 | // class via a tool like ResGen or Visual Studio. 20 | // To add or remove a member, edit your .ResX file then rerun ResGen 21 | // with the /str option, or rebuild your VS project. 22 | [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "16.0.0.0")] 23 | [global::System.Diagnostics.DebuggerNonUserCodeAttribute()] 24 | [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()] 25 | internal class Resources { 26 | 27 | private static global::System.Resources.ResourceManager resourceMan; 28 | 29 | private static global::System.Globalization.CultureInfo resourceCulture; 30 | 31 | [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")] 32 | internal Resources() { 33 | } 34 | 35 | /// 36 | /// Returns the cached ResourceManager instance used by this class. 37 | /// 38 | [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)] 39 | internal static global::System.Resources.ResourceManager ResourceManager { 40 | get { 41 | if (object.ReferenceEquals(resourceMan, null)) { 42 | global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("KugouDecryption.Properties.Resources", typeof(Resources).Assembly); 43 | resourceMan = temp; 44 | } 45 | return resourceMan; 46 | } 47 | } 48 | 49 | /// 50 | /// Overrides the current thread's CurrentUICulture property for all 51 | /// resource lookups using this strongly typed resource class. 52 | /// 53 | [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)] 54 | internal static global::System.Globalization.CultureInfo Culture { 55 | get { 56 | return resourceCulture; 57 | } 58 | set { 59 | resourceCulture = value; 60 | } 61 | } 62 | 63 | /// 64 | /// Looks up a localized resource of type System.Byte[]. 65 | /// 66 | internal static byte[] kgm_v2 { 67 | get { 68 | object obj = ResourceManager.GetObject("kgm_v2", resourceCulture); 69 | return ((byte[])(obj)); 70 | } 71 | } 72 | } 73 | } 74 | -------------------------------------------------------------------------------- /KugouDecryption/Properties/Resources.resx: -------------------------------------------------------------------------------- 1 |  2 | 3 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | text/microsoft-resx 110 | 111 | 112 | 2.0 113 | 114 | 115 | System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 116 | 117 | 118 | System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 119 | 120 | 121 | 122 | ..\kgm.v2.xz;System.Byte[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 123 | 124 | -------------------------------------------------------------------------------- /KugouDecryption/kgm.v2.xz: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Executor-Cheng/KugouDecryption/754efaeeea968f8975575ca4c734f24cb71f4b73/KugouDecryption/kgm.v2.xz -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2021 Executor 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # KugouDecryption 2 | 解密酷狗的kgma/vpr 3 | 4 | 本项目参考 [unlock-music/cli](https://github.com/unlock-music/cli) 制作而成 5 | 解密时, 对`xz`压缩格式进行解压缩操作的内存开销十分巨大, 大概会暂时占用 130MB 左右的内存 6 | --------------------------------------------------------------------------------