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Fix: algorithm bugs in qmc

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Optimize: algorithm in `kgm`
This commit is contained in:
Emmm Monster
2021-08-03 04:17:10 +08:00
parent 60c15894c0
commit 28d84e4dc2
3 changed files with 6 additions and 10 deletions
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8
algo/kgm/kgm.go
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@@ -75,12 +75,8 @@ func (d *Decoder) Decode() error {
d.audio = make([]byte, lenData)
for i := 0; i < lenData; i++ {
med8 := d.key[i%17] ^ dataEncrypted[i]
med8 ^= (med8 & 0xf) << 4
msk8 := maskV2PreDef[i%272] ^ maskV2[i>>4]
msk8 ^= (msk8 & 0xf) << 4
d.audio[i] = med8 ^ msk8
med8 := dataEncrypted[i] ^ d.key[i%17] ^ maskV2PreDef[i%(16*17)] ^ maskV2[i>>4]
d.audio[i] = med8 ^ (med8&0xf)<<4
}
if d.isVpr {
for i := 0; i < lenData; i++ {