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KgmWasm
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bugfix for wrong buffer size for preDec

This commit is contained in:
朱 征赜 2023-08-29 00:55:06 +08:00
parent c245ae7477
commit 62ecc63af0
1 changed files with 9 additions and 9 deletions
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18
kgm_wasm.ts
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@ -2,7 +2,7 @@ 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
// 每次可以处理 2M 的数据
const DECRYPTION_BUF_SIZE = 2 *1024 * 1024;
export interface KGMDecryptionResult {
@ -36,12 +36,12 @@ export async function DecryptKgmWasm(kgmBlob: ArrayBuffer, ext: string): Promise
// 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);
const pKgmBuf = KgmCryptoObj._malloc(DECRYPTION_BUF_SIZE);
const preDecDataSize = Math.min(DECRYPTION_BUF_SIZE, kgmBlob.byteLength); // 初始化缓冲区大小
KgmCryptoObj.writeArrayToMemory(kgmBuf.slice(0, preDecDataSize), pKgmBuf);
// 进行解密初始化
const headerSize = KgmCryptoObj.preDec(pQmcBuf, DECRYPTION_BUF_SIZE, ext);
console.log(headerSize);
const headerSize = KgmCryptoObj.preDec(pKgmBuf, preDecDataSize, ext);
kgmBuf = kgmBuf.slice(headerSize);
const decryptedParts = [];
@ -52,14 +52,14 @@ export async function DecryptKgmWasm(kgmBlob: ArrayBuffer, ext: string): Promise
// 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));
KgmCryptoObj.writeArrayToMemory(blockData, pKgmBuf);
KgmCryptoObj.decBlob(pKgmBuf, blockSize, offset);
decryptedParts.push(KgmCryptoObj.HEAPU8.slice(pKgmBuf, pKgmBuf + blockSize));
offset += blockSize;
bytesToDecrypt -= blockSize;
}
KgmCryptoObj._free(pQmcBuf);
KgmCryptoObj._free(pKgmBuf);
result.data = MergeUint8Array(decryptedParts);
result.success = true;