fix(QMCv2): cipher should determine by key size

(cherry picked from commit dba63f212cbf9351e5dc16870eb32ae582db2867)
master
MengYX 9 months ago
parent c1320c811b
commit b9efb68851
No known key found for this signature in database
GPG Key ID: E63F9C7303E8F604
  1. 15
      src/decrypt/qmc.ts

@ -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)
}
}
}

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