add source

2024-01-30 00:16:29 +00:00 · 2023-01-20 00:18:44 +08:00 · 2023-01-20 00:18:44 +08:00 · b44ada92b1
commit b44ada92b1
parent 57c942a0d2
5 changed files with 283 additions and 0 deletions
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -0,0 +1,65 @@
+# CMakeList.txt : CMake project for KgmWasm, include source and define
+# project specific logic here.
+#
+cmake_minimum_required (VERSION 3.8)
+
+project ("KgmWasm")
+
+set(CMAKE_CXX_STANDARD 14)
+
+include_directories(
+	$<TARGET_PROPERTY:INTERFACE_INCLUDE_DIRECTORIES>
+)
+
+# Add source to this project's executable.
+set(RUNTIME_METHODS_LIST
+	getValue
+	writeArrayToMemory
+	UTF8ToString
+)
+list(JOIN RUNTIME_METHODS_LIST "," RUNTIME_METHODS)
+
+set(EMSCRIPTEN_FLAGS
+	"--bind"
+	"-s NO_DYNAMIC_EXECUTION=1"
+	"-s MODULARIZE=1"
+	"-s EXPORT_NAME=KgmCryptoModule"
+	"-s EXPORTED_RUNTIME_METHODS=${RUNTIME_METHODS}"
+)
+set(EMSCRIPTEN_LEGACY_FLAGS
+	${EMSCRIPTEN_FLAGS}
+	"-s WASM=0"
+	"--memory-init-file 0"
+)
+set(EMSCRIPTEN_WASM_BUNDLE_FLAGS
+	${EMSCRIPTEN_FLAGS}
+	"-s SINGLE_FILE=1"
+)
+
+list(JOIN EMSCRIPTEN_FLAGS             " " EMSCRIPTEN_FLAGS_STR)
+list(JOIN EMSCRIPTEN_LEGACY_FLAGS      " " EMSCRIPTEN_LEGACY_FLAGS_STR)
+list(JOIN EMSCRIPTEN_WASM_BUNDLE_FLAGS " " EMSCRIPTEN_WASM_BUNDLE_FLAGS_STR)
+
+# Define projects config
+set(WASM_SOURCES
+	"KgmWasm.cpp"
+)
+
+add_executable(KgmWasm ${WASM_SOURCES})
+set_target_properties(
+	KgmWasm
+	PROPERTIES LINK_FLAGS ${EMSCRIPTEN_FLAGS_STR}
+)
+
+add_executable(KgmWasmBundle ${WASM_SOURCES})
+set_target_properties(
+	KgmWasmBundle
+	PROPERTIES LINK_FLAGS ${EMSCRIPTEN_WASM_BUNDLE_FLAGS_STR}
+)
+
+add_executable(KgmLegacy ${WASM_SOURCES})
+set_target_properties(
+	KgmLegacy
+	PROPERTIES LINK_FLAGS ${EMSCRIPTEN_LEGACY_FLAGS_STR}
+)
+
--- a/KgmWasm.cpp
+++ b/KgmWasm.cpp
@ -0,0 +1,20 @@
+// KgmWasm.cpp : Defines the entry point for the application.
+//
+
+#include "KgmWasm.h"
+
+#include "kgm.hpp"
+
+#include <stddef.h>
+#include <string.h>
+
+size_t preDec(uintptr_t blob, size_t blobSize, std::string ext)
+{
+    return PreDec((uint8_t*)blob, blobSize, ext == "vpr");
+}
+
+void decBlob(uintptr_t blob, size_t blobSize, size_t offset)
+{
+    Decrypt((uint8_t*)blob, blobSize, offset);
+    return;
+}
--- a/KgmWasm.h
+++ b/KgmWasm.h
@ -0,0 +1,18 @@
+// KgmWasm.h : Include file for standard system include files,
+// or project specific include files.
+
+#pragma once
+
+#include <emscripten/bind.h>
+#include <string>
+
+namespace em = emscripten;
+
+size_t preDec(uintptr_t blob, size_t blobSize, std::string ext);
+void decBlob(uintptr_t blob, size_t blobSize, size_t offset);
+
+EMSCRIPTEN_BINDINGS(QmcCrypto)
+{
+  em::function("preDec", &preDec, em::allow_raw_pointers());
+  em::function("decBlob", &decBlob, em::allow_raw_pointers());
+}
--- a/kgm.hpp
+++ b/kgm.hpp
@ -0,0 +1,112 @@
+#include <vector>
+
+std::vector<uint8_t> VprHeader = {
+    0x05, 0x28, 0xBC, 0x96, 0xE9, 0xE4, 0x5A, 0x43,
+    0x91, 0xAA, 0xBD, 0xD0, 0x7A, 0xF5, 0x36, 0x31 };
+std::vector<uint8_t> KgmHeader = {
+    0x7C, 0xD5, 0x32, 0xEB, 0x86, 0x02, 0x7F, 0x4B,
+    0xA8, 0xAF, 0xA6, 0x8E, 0x0F, 0xFF, 0x99, 0x14 };
+std::vector<uint8_t> VprMaskDiff = {
+    0x25, 0xDF, 0xE8, 0xA6, 0x75, 0x1E, 0x75, 0x0E,
+    0x2F, 0x80, 0xF3, 0x2D, 0xB8, 0xB6, 0xE3, 0x11, 0x00 };
+
+std::vector<uint8_t> MaskV2;
+
+std::vector<uint8_t> table1 = {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x01, 0x21, 0x01, 0x61, 0x01, 0x21, 0x01, 0xe1, 0x01, 0x21, 0x01, 0x61, 0x01, 0x21, 0x01,
+    0xd2, 0x23, 0x02, 0x02, 0x42, 0x42, 0x02, 0x02, 0xc2, 0xc2, 0x02, 0x02, 0x42, 0x42, 0x02, 0x02,
+    0xd3, 0xd3, 0x02, 0x03, 0x63, 0x43, 0x63, 0x03, 0xe3, 0xc3, 0xe3, 0x03, 0x63, 0x43, 0x63, 0x03,
+    0x94, 0xb4, 0x94, 0x65, 0x04, 0x04, 0x04, 0x04, 0x84, 0x84, 0x84, 0x84, 0x04, 0x04, 0x04, 0x04,
+    0x95, 0x95, 0x95, 0x95, 0x04, 0x05, 0x25, 0x05, 0xe5, 0x85, 0xa5, 0x85, 0xe5, 0x05, 0x25, 0x05,
+    0xd6, 0xb6, 0x96, 0xb6, 0xd6, 0x27, 0x06, 0x06, 0xc6, 0xc6, 0x86, 0x86, 0xc6, 0xc6, 0x06, 0x06,
+    0xd7, 0xd7, 0x97, 0x97, 0xd7, 0xd7, 0x06, 0x07, 0xe7, 0xc7, 0xe7, 0x87, 0xe7, 0xc7, 0xe7, 0x07,
+    0x18, 0x38, 0x18, 0x78, 0x18, 0x38, 0x18, 0xe9, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
+    0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x19, 0x08, 0x09, 0x29, 0x09, 0x69, 0x09, 0x29, 0x09,
+    0xda, 0x3a, 0x1a, 0x3a, 0x5a, 0x3a, 0x1a, 0x3a, 0xda, 0x2b, 0x0a, 0x0a, 0x4a, 0x4a, 0x0a, 0x0a,
+    0xdb, 0xdb, 0x1b, 0x1b, 0x5b, 0x5b, 0x1b, 0x1b, 0xdb, 0xdb, 0x0a, 0x0b, 0x6b, 0x4b, 0x6b, 0x0b,
+    0x9c, 0xbc, 0x9c, 0x7c, 0x1c, 0x3c, 0x1c, 0x7c, 0x9c, 0xbc, 0x9c, 0x6d, 0x0c, 0x0c, 0x0c, 0x0c,
+    0x9d, 0x9d, 0x9d, 0x9d, 0x1d, 0x1d, 0x1d, 0x1d, 0x9d, 0x9d, 0x9d, 0x9d, 0x0c, 0x0d, 0x2d, 0x0d,
+    0xde, 0xbe, 0x9e, 0xbe, 0xde, 0x3e, 0x1e, 0x3e, 0xde, 0xbe, 0x9e, 0xbe, 0xde, 0x2f, 0x0e, 0x0e,
+    0xdf, 0xdf, 0x9f, 0x9f, 0xdf, 0xdf, 0x1f, 0x1f, 0xdf, 0xdf, 0x9f, 0x9f, 0xdf, 0xdf, 0x0e, 0x0f,
+    0x00, 0x20, 0x00, 0x60, 0x00, 0x20, 0x00, 0xe0, 0x00, 0x20, 0x00, 0x60, 0x00, 0x20, 0x00, 0xf1
+};
+
+std::vector<uint8_t> table2 = {
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0x01, 0x23, 0x01, 0x67, 0x01, 0x23, 0x01, 0xef, 0x01, 0x23, 0x01, 0x67, 0x01, 0x23, 0x01,
+    0xdf, 0x21, 0x02, 0x02, 0x46, 0x46, 0x02, 0x02, 0xce, 0xce, 0x02, 0x02, 0x46, 0x46, 0x02, 0x02,
+    0xde, 0xde, 0x02, 0x03, 0x65, 0x47, 0x65, 0x03, 0xed, 0xcf, 0xed, 0x03, 0x65, 0x47, 0x65, 0x03,
+    0x9d, 0xbf, 0x9d, 0x63, 0x04, 0x04, 0x04, 0x04, 0x8c, 0x8c, 0x8c, 0x8c, 0x04, 0x04, 0x04, 0x04,
+    0x9c, 0x9c, 0x9c, 0x9c, 0x04, 0x05, 0x27, 0x05, 0xeb, 0x8d, 0xaf, 0x8d, 0xeb, 0x05, 0x27, 0x05,
+    0xdb, 0xbd, 0x9f, 0xbd, 0xdb, 0x25, 0x06, 0x06, 0xca, 0xca, 0x8e, 0x8e, 0xca, 0xca, 0x06, 0x06,
+    0xda, 0xda, 0x9e, 0x9e, 0xda, 0xda, 0x06, 0x07, 0xe9, 0xcb, 0xe9, 0x8f, 0xe9, 0xcb, 0xe9, 0x07,
+    0x19, 0x3b, 0x19, 0x7f, 0x19, 0x3b, 0x19, 0xe7, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08,
+    0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x08, 0x09, 0x2b, 0x09, 0x6f, 0x09, 0x2b, 0x09,
+    0xd7, 0x39, 0x1b, 0x39, 0x5f, 0x39, 0x1b, 0x39, 0xd7, 0x29, 0x0a, 0x0a, 0x4e, 0x4e, 0x0a, 0x0a,
+    0xd6, 0xd6, 0x1a, 0x1a, 0x5e, 0x5e, 0x1a, 0x1a, 0xd6, 0xd6, 0x0a, 0x0b, 0x6d, 0x4f, 0x6d, 0x0b,
+    0x95, 0xb7, 0x95, 0x7b, 0x1d, 0x3f, 0x1d, 0x7b, 0x95, 0xb7, 0x95, 0x6b, 0x0c, 0x0c, 0x0c, 0x0c,
+    0x94, 0x94, 0x94, 0x94, 0x1c, 0x1c, 0x1c, 0x1c, 0x94, 0x94, 0x94, 0x94, 0x0c, 0x0d, 0x2f, 0x0d,
+    0xd3, 0xb5, 0x97, 0xb5, 0xd3, 0x3d, 0x1f, 0x3d, 0xd3, 0xb5, 0x97, 0xb5, 0xd3, 0x2d, 0x0e, 0x0e,
+    0xd2, 0xd2, 0x96, 0x96, 0xd2, 0xd2, 0x1e, 0x1e, 0xd2, 0xd2, 0x96, 0x96, 0xd2, 0xd2, 0x0e, 0x0f,
+    0x00, 0x22, 0x00, 0x66, 0x00, 0x22, 0x00, 0xee, 0x00, 0x22, 0x00, 0x66, 0x00, 0x22, 0x00, 0xfe
+};
+
+std::vector<uint8_t> MaskV2PreDef = {
+    0xB8, 0xD5, 0x3D, 0xB2, 0xE9, 0xAF, 0x78, 0x8C, 0x83, 0x33, 0x71, 0x51, 0x76, 0xA0, 0xCD, 0x37,
+    0x2F, 0x3E, 0x35, 0x8D, 0xA9, 0xBE, 0x98, 0xB7, 0xE7, 0x8C, 0x22, 0xCE, 0x5A, 0x61, 0xDF, 0x68,
+    0x69, 0x89, 0xFE, 0xA5, 0xB6, 0xDE, 0xA9, 0x77, 0xFC, 0xC8, 0xBD, 0xBD, 0xE5, 0x6D, 0x3E, 0x5A,
+    0x36, 0xEF, 0x69, 0x4E, 0xBE, 0xE1, 0xE9, 0x66, 0x1C, 0xF3, 0xD9, 0x02, 0xB6, 0xF2, 0x12, 0x9B,
+    0x44, 0xD0, 0x6F, 0xB9, 0x35, 0x89, 0xB6, 0x46, 0x6D, 0x73, 0x82, 0x06, 0x69, 0xC1, 0xED, 0xD7,
+    0x85, 0xC2, 0x30, 0xDF, 0xA2, 0x62, 0xBE, 0x79, 0x2D, 0x62, 0x62, 0x3D, 0x0D, 0x7E, 0xBE, 0x48,
+    0x89, 0x23, 0x02, 0xA0, 0xE4, 0xD5, 0x75, 0x51, 0x32, 0x02, 0x53, 0xFD, 0x16, 0x3A, 0x21, 0x3B,
+    0x16, 0x0F, 0xC3, 0xB2, 0xBB, 0xB3, 0xE2, 0xBA, 0x3A, 0x3D, 0x13, 0xEC, 0xF6, 0x01, 0x45, 0x84,
+    0xA5, 0x70, 0x0F, 0x93, 0x49, 0x0C, 0x64, 0xCD, 0x31, 0xD5, 0xCC, 0x4C, 0x07, 0x01, 0x9E, 0x00,
+    0x1A, 0x23, 0x90, 0xBF, 0x88, 0x1E, 0x3B, 0xAB, 0xA6, 0x3E, 0xC4, 0x73, 0x47, 0x10, 0x7E, 0x3B,
+    0x5E, 0xBC, 0xE3, 0x00, 0x84, 0xFF, 0x09, 0xD4, 0xE0, 0x89, 0x0F, 0x5B, 0x58, 0x70, 0x4F, 0xFB,
+    0x65, 0xD8, 0x5C, 0x53, 0x1B, 0xD3, 0xC8, 0xC6, 0xBF, 0xEF, 0x98, 0xB0, 0x50, 0x4F, 0x0F, 0xEA,
+    0xE5, 0x83, 0x58, 0x8C, 0x28, 0x2C, 0x84, 0x67, 0xCD, 0xD0, 0x9E, 0x47, 0xDB, 0x27, 0x50, 0xCA,
+    0xF4, 0x63, 0x63, 0xE8, 0x97, 0x7F, 0x1B, 0x4B, 0x0C, 0xC2, 0xC1, 0x21, 0x4C, 0xCC, 0x58, 0xF5,
+    0x94, 0x52, 0xA3, 0xF3, 0xD3, 0xE0, 0x68, 0xF4, 0x00, 0x23, 0xF3, 0x5E, 0x0A, 0x7B, 0x93, 0xDD,
+    0xAB, 0x12, 0xB2, 0x13, 0xE8, 0x84, 0xD7, 0xA7, 0x9F, 0x0F, 0x32, 0x4C, 0x55, 0x1D, 0x04, 0x36,
+    0x52, 0xDC, 0x03, 0xF3, 0xF9, 0x4E, 0x42, 0xE9, 0x3D, 0x61, 0xEF, 0x7C, 0xB6, 0xB3, 0x93, 0x50,
+};
+
+uint8_t getMask(size_t pos) {
+    size_t offset = pos >> 4;
+    uint8_t value = 0;
+    while (offset >= 0x11) {
+        value ^= table1[offset % 272];
+        offset >>= 4;
+        value ^= table2[offset % 272];
+        offset >>= 4;
+    }
+
+    return MaskV2PreDef[pos % 272] ^ value;
+}
+
+std::vector<uint8_t> key(17);
+bool isVpr = false;
+
+size_t PreDec(uint8_t* fileData, size_t size, bool iV) {
+    uint32_t headerLen = *(uint32_t*)(fileData + 0x10);
+    memcpy(key.data(), (fileData + 0x1C), 0x10);
+    key[16] = 0;
+    isVpr = iV;
+    return headerLen;
+}
+
+void Decrypt(uint8_t* fileData, size_t size, size_t offset) {
+    for (size_t i = 0; i < size; ++i) {
+        uint8_t med8 = key[(i + offset) % 17] ^ fileData[i];
+        med8 ^= (med8 & 0xf) << 4;
+
+        uint8_t msk8 = getMask(i + offset);
+        msk8 ^= (msk8 & 0xf) << 4;
+        fileData[i] = med8 ^ msk8;
+
+        if (isVpr) {
+            fileData[i] ^= VprMaskDiff[(i + offset) % 17];
+        }
+    }
+}
--- a/kgm_wasm.ts
+++ b/kgm_wasm.ts
@ -0,0 +1,68 @@
+import { KgmCrypto } from '@xhacker/kgmwasm/KgmWasmBundle';
+import KgmCryptoModule from '@xhacker/kgmwasm/KgmWasmBundle';
+import { MergeUint8Array } from '@/utils/MergeUint8Array';
+
+// 每次处理 2M 的数据
+const DECRYPTION_BUF_SIZE = 2 *1024 * 1024;
+
+export interface KGMDecryptionResult {
+  success: boolean;
+  data: Uint8Array;
+  error: string;
+}
+
+/**
+ * 解密一个 KGM 加密的文件。
+ *
+ * 如果检测并解密成功，返回解密后的 Uint8Array 数据。
+ * @param  {ArrayBuffer} kgmBlob 读入的文件 Blob
+ */
+export async function DecryptKgmWasm(kgmBlob: ArrayBuffer, ext: string): Promise<KGMDecryptionResult> {
+  const result: KGMDecryptionResult = { success: false, data: new Uint8Array(), error: '' };
+
+  // 初始化模组
+  let KgmCryptoObj: KgmCrypto;
+
+  try {
+    KgmCryptoObj = await KgmCryptoModule();
+  } catch (err: any) {
+    result.error = err?.message || 'wasm 加载失败';
+    return result;
+  }
+  if (!KgmCryptoObj) {
+    result.error = 'wasm 加载失败';
+    return result;
+  }
+
+  // 申请内存块，并文件末端数据到 WASM 的内存堆
+  let kgmBuf = new Uint8Array(kgmBlob);
+  const pQmcBuf = KgmCryptoObj._malloc(DECRYPTION_BUF_SIZE);
+  KgmCryptoObj.writeArrayToMemory(kgmBuf.slice(0, DECRYPTION_BUF_SIZE), pQmcBuf);
+
+  // 进行解密初始化
+  const headerSize = KgmCryptoObj.preDec(pQmcBuf, DECRYPTION_BUF_SIZE, ext);
+  console.log(headerSize);
+  kgmBuf = kgmBuf.slice(headerSize);
+
+  const decryptedParts = [];
+  let offset = 0;
+  let bytesToDecrypt = kgmBuf.length;
+  while (bytesToDecrypt > 0) {
+    const blockSize = Math.min(bytesToDecrypt, DECRYPTION_BUF_SIZE);
+
+    // 解密一些片段
+    const blockData = new Uint8Array(kgmBuf.slice(offset, offset + blockSize));
+    KgmCryptoObj.writeArrayToMemory(blockData, pQmcBuf);
+    KgmCryptoObj.decBlob(pQmcBuf, blockSize, offset);
+    decryptedParts.push(KgmCryptoObj.HEAPU8.slice(pQmcBuf, pQmcBuf + blockSize));
+
+    offset += blockSize;
+    bytesToDecrypt -= blockSize;
+  }
+  KgmCryptoObj._free(pQmcBuf);
+
+  result.data = MergeUint8Array(decryptedParts);
+  result.success = true;
+
+  return result;
+}