[kgm] refactor: convert to enum for dispatch

um_cli/src/cmd/kgm.rs

@@ -4,6 +4,7 @@ use std::fs::File;
 use std::io::{Read, Seek, SeekFrom, Write};
 use std::path::PathBuf;
 use umc_kgm::header::Header;
+use umc_kgm::Decipher;
 
 /// Decrypt a KGM/VPR file (Kugou Music)
 #[derive(Args)]
@@ -23,7 +24,7 @@ impl ArgsKGM {
         let mut header = [0u8; 0x40];
         file_input.read_exact(&mut header)?;
         let kgm_header = Header::from_buffer(&mut header)?;
-        let decipher = kgm_header.make_decipher()?;
+        let decipher = Decipher::new(&kgm_header)?;
         file_input.seek(SeekFrom::Start(kgm_header.offset_to_data as u64))?;
 
         let mut offset = 0usize;