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[kgm/ncm/kwm] refactor: improve performance for large file

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鲁树人
2024-09-15 23:25:19 +01:00
parent fd73e8b9a3
commit da806d7ad4
4 changed files with 18 additions and 30 deletions
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11
um_crypto/kuwo/src/kwm_v1.rs
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@@ -11,10 +11,8 @@ const KEY: [u8; 0x20] = [
impl CipherV1 {
pub fn new(resource_id: u32) -> Self {
let mut key = KEY;
for (k, r) in key
.iter_mut()
.zip(resource_id.to_string().as_bytes().iter().cycle())
{
let resource_id = resource_id.to_string();
for (k, &r) in key.iter_mut().zip(resource_id.as_bytes().iter().cycle()) {
*k ^= r;
}
@@ -26,10 +24,9 @@ impl CipherV1 {
T: AsMut<[u8]> + ?Sized,
{
let data = data.as_mut();
let key_stream = self.key.iter().cycle().skip(offset % self.key.len());
for (datum, key) in data.iter_mut().zip(key_stream) {
*datum ^= *key;
for (datum, offset) in data.iter_mut().zip(offset..) {
*datum ^= self.key[offset % self.key.len()];
}
}
}