um/web
um
/
web
81
147
Fork 60
Code Issues 15 Pull Requests 1 Packages Projects Releases 2 Wiki Activity

Merge pull request #214 from unlock-music/fix/qmc-cipher 

fix(QMCv2): cipher should determine by key size
This commit is contained in:
MengYX 2021-12-18 22:32:29 +08:00 committed by GitHub
parent 5ec23215fa e1efbe53fc
commit 4057b88fef
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
src/decrypt/qmc.ts
View File

@ -177,16 +177,14 @@ export class QmcDecoder {
this.audioSize = this.size - keySize - 8
const rawKey = this.file.subarray(this.audioSize, this.size - 8)
const keyEnd = rawKey.findIndex(v => v == QmcDecoder.BYTE_COMMA)
const keyDec = QmcDeriveKey(rawKey.subarray(0, keyEnd))
this.cipher = new QmcRC4Cipher(keyDec)
this.setCipher(rawKey.subarray(0, keyEnd))
} else {
const sizeView = new DataView(last4Byte.buffer, last4Byte.byteOffset);
const keySize = sizeView.getUint32(0, true)
if (keySize < 0x300) {
this.audioSize = this.size - keySize - 4
const rawKey = this.file.subarray(this.audioSize, this.size - 4)
const keyDec = QmcDeriveKey(rawKey)
this.cipher = new QmcMapCipher(keyDec)
this.setCipher(rawKey)
} else {
this.audioSize = this.size
this.cipher = new QmcStaticCipher()
@ -194,5 +192,14 @@ export class QmcDecoder {
}
}
private setCipher(keyRaw: Uint8Array) {
const keyDec = QmcDeriveKey(keyRaw)
if (keyDec.length > 300) {
this.cipher = new QmcRC4Cipher(keyDec)
} else {
this.cipher = new QmcMapCipher(keyDec)
}
}
}