.idea/lib_um_crypto.iml

@@ -11,8 +11,6 @@
       <sourceFolder url="file://$MODULE_DIR$/um_crypto/ncm/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/um_audio/src" isTestSource="false" />
       <excludeFolder url="file://$MODULE_DIR$/target" />
-      <excludeFolder url="file://$MODULE_DIR$/um_wasm_loader/dist" />
-      <excludeFolder url="file://$MODULE_DIR$/um_wasm_loader/pkg" />
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />

um_crypto/kuwo/src/des/mod.rs

@@ -7,7 +7,7 @@ use core::{KuwoDes, Mode};
 use umc_utils::base64;
 
 /// Decrypt string content
-pub fn decrypt_ksing<T: AsRef<[u8]>>(data: T, key: &[u8; 8]) -> Result<String> {
+pub fn decrypt_ksing(data: &str, key: &[u8; 8]) -> Result<String> {
     let mut decoded = base64::decode(data)?;
 
     let des = KuwoDes::new(key, Mode::Decrypt);
@@ -30,7 +30,7 @@ pub fn encrypt_ksing<T: AsRef<[u8]>>(data: T, key: &[u8; 8]) -> Result<String> {
     Ok(base64::encode(data))
 }
 
-pub fn decode_ekey<T: AsRef<[u8]>>(data: T, key: &[u8; 8]) -> Result<String> {
+pub fn decode_ekey(data: &str, key: &[u8; 8]) -> Result<String> {
     let decoded = decrypt_ksing(data, key)?;
     Ok(decoded[16..].to_string())
 }

um_crypto/kuwo/src/kwm_v1.rs

@@ -11,10 +11,7 @@ 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())
-        {
+        for (k, r) in key.iter_mut().zip(resource_id.to_string().as_bytes()) {
             *k ^= r;
         }
 

um_crypto/kuwo/src/lib.rs

@@ -1,7 +1,6 @@
 use crate::kwm_v1::CipherV1;
 use anyhow::Result;
 use byteorder::{ReadBytesExt, LE};
-use std::fmt;
 use std::io::{Cursor, Read};
 use thiserror::Error;
 use umc_qmc::QMCv2Cipher;
@@ -14,16 +13,13 @@ pub use umc_qmc::QMCv2Cipher as CipherV2;
 /// Commonly used secret key for Kuwo services.
 pub const SECRET_KEY: [u8; 8] = *b"ylzsxkwm";
 
-#[derive(Debug)]
-pub struct HeaderMagicBytes(pub [u8; 16]);
-
 #[derive(Error, Debug)]
 pub enum KuwoCryptoError {
     #[error("Invalid DES data size (expected: {0} mod 8 == 0)")]
     InvalidDesDataSize(usize),
 
-    #[error("Invalid KWM header magic bytes: {0}")]
-    InvalidHeaderMagic(HeaderMagicBytes),
+    #[error("Invalid KWM header magic bytes: {0:?}")]
+    InvalidHeaderMagic([u8; 16]),
 
     #[error("KWMv2: EKey required")]
     V2EKeyRequired,
@@ -32,15 +28,6 @@ pub enum KuwoCryptoError {
     UnsupportedVersion(usize),
 }
 
-impl fmt::Display for HeaderMagicBytes {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        for byte in self.0.iter() {
-            write!(f, "{:02x} ", byte)?;
-        }
-        Ok(())
-    }
-}
-
 pub const DATA_START_OFFSET: usize = 0x400;
 
 pub enum Cipher {
@@ -91,8 +78,8 @@ impl Header {
         let mut format_name = [0u8; 0x0C];
         cursor.read_exact(&mut format_name)?;
 
-        if magic != Self::MAGIC_1 && magic != Self::MAGIC_2 {
-            Err(KuwoCryptoError::InvalidHeaderMagic(HeaderMagicBytes(magic)))?;
+        if magic != Self::MAGIC_1 || magic != Self::MAGIC_2 {
+            Err(KuwoCryptoError::InvalidHeaderMagic(magic))?;
         }
 
         Ok(Self {
@@ -112,7 +99,7 @@ impl Header {
         let cipher = match self.version {
             1 => Cipher::V1(CipherV1::new(self.resource_id)),
             2 => match ekey {
-                Some(ekey) => Cipher::V2(CipherV2::new_from_ekey(ekey)?),
+                Some(ekey) => Cipher::V2(CipherV2::new(ekey)?),
                 None => Err(KuwoCryptoError::V2EKeyRequired)?,
             },
             version => Err(KuwoCryptoError::UnsupportedVersion(version as usize))?,
@@ -134,9 +121,9 @@ impl Header {
 pub struct CipherBoDian(QMCv2Cipher);
 
 impl CipherBoDian {
-    pub fn new<T: AsRef<[u8]>>(ekey: T) -> Result<Self> {
-        let ekey = des::decode_ekey(ekey, &SECRET_KEY)?;
-        let cipher = CipherV2::new_from_ekey(ekey.as_str())?;
+    pub fn new(ekey: &str) -> Result<Self> {
+        let ekey = des::decode_ekey(&ekey, &SECRET_KEY)?;
+        let cipher = CipherV2::new(ekey)?;
         Ok(Self(cipher))
     }
 

um_crypto/qmc/src/ekey.rs

@@ -42,7 +42,7 @@ fn make_simple_key<const N: usize>() -> [u8; N] {
     result
 }
 
-pub fn decrypt_v1(ekey: &[u8]) -> Result<Vec<u8>> {
+pub fn decrypt_v1(ekey: &[u8]) -> Result<Box<[u8]>> {
     if ekey.len() < 12 {
         Err(EKeyDecryptError::EKeyTooShort)?;
     }
@@ -58,10 +58,10 @@ pub fn decrypt_v1(ekey: &[u8]) -> Result<Vec<u8>> {
         .collect_vec();
 
     let plaintext = tc_tea::decrypt(cipher, tea_key).map_err(EKeyDecryptError::FailDecryptV1)?;
-    Ok([header, &plaintext].concat())
+    Ok([header, &plaintext].concat().into())
 }
 
-pub fn decrypt_v2(ekey: &[u8]) -> Result<Vec<u8>> {
+pub fn decrypt_v2(ekey: &[u8]) -> Result<Box<[u8]>> {
     let ekey = base64::decode(ekey)?;
     let ekey = tc_tea::decrypt(ekey, EKEY_V2_KEY1).map_err(EKeyDecryptError::FailDecryptV2)?;
     let ekey = tc_tea::decrypt(ekey, EKEY_V2_KEY2).map_err(EKeyDecryptError::FailDecryptV2)?;
@@ -70,7 +70,7 @@ pub fn decrypt_v2(ekey: &[u8]) -> Result<Vec<u8>> {
     decrypt_v1(&ekey)
 }
 
-pub fn decrypt<T: AsRef<[u8]>>(ekey: T) -> Result<Vec<u8>> {
+pub fn decrypt<T: AsRef<[u8]>>(ekey: T) -> Result<Box<[u8]>> {
     let ekey = ekey.as_ref();
     match ekey.strip_prefix(EKEY_V2_PREFIX) {
         Some(v2_ekey) => decrypt_v2(v2_ekey),

um_crypto/qmc/src/lib.rs

@@ -35,11 +35,6 @@ impl QMCv2Cipher {
         Ok(cipher)
     }
 
-    pub fn new_from_ekey<T: AsRef<[u8]>>(ekey_str: T) -> Result<Self> {
-        let key = ekey::decrypt(ekey_str)?;
-        Self::new(key)
-    }
-
     pub fn decrypt<T>(&self, data: &mut T, offset: usize)
     where
         T: AsMut<[u8]> + ?Sized,

um_wasm/src/exports/qmc.rs

@@ -19,7 +19,8 @@ impl JsQMC2 {
     /// Create a new QMC2 (mgg/mflac) cipher instance.
     #[wasm_bindgen(constructor)]
     pub fn new(ekey: &str) -> Result<JsQMC2, JsError> {
-        let cipher = QMCv2Cipher::new_from_ekey(ekey).map_err(map_js_error)?;
+        let key = umc_qmc::ekey::decrypt(ekey).map_err(map_js_error)?;
+        let cipher = QMCv2Cipher::new(key).map_err(map_js_error)?;
         Ok(JsQMC2(cipher))
     }
 

um_wasm_loader/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@unlock-music/crypto",
-  "version": "0.0.0-alpha.11",
+  "version": "0.0.0-alpha.10",
   "description": "Project Unlock Music: 加解密支持库",
   "scripts": {
     "build": "node build.js",