[wasm/qtfm] feat: add qtfm wasm glue

um_wasm/src/exports/qtfm.rs

@@ -0,0 +1,40 @@
+use std::convert::TryInto;
+use umc_qtfm::{nonce, secret, Decipher};
+use wasm_bindgen::prelude::wasm_bindgen;
+use wasm_bindgen::JsError;
+
+/// QingTingFM QTA file decipher.
+#[wasm_bindgen(js_name=QingTingFM)]
+pub struct JsQingTingFM(Decipher);
+
+#[wasm_bindgen(js_class = QingTingFM)]
+impl JsQingTingFM {
+    #[wasm_bindgen(js_name=getDeviceKey)]
+    pub fn get_device_key(
+        product: &str,
+        device: &str,
+        manufacturer: &str,
+        brand: &str,
+        board: &str,
+        model: &str,
+    ) -> Vec<u8> {
+        secret::make_device_secret(product, device, manufacturer, brand, board, model).to_vec()
+    }
+
+    #[wasm_bindgen(js_name=getFileIV)]
+    pub fn get_file_iv(file_name: &str) -> Result<Vec<u8>, JsError> {
+        let iv = nonce::make_decipher_iv(file_name)?;
+        Ok(iv.to_vec())
+    }
+
+    #[wasm_bindgen(constructor)]
+    pub fn new(device_key: &[u8], file_iv: &[u8]) -> Result<JsQingTingFM, JsError> {
+        let decipher = Decipher::new(device_key.try_into()?, file_iv.try_into()?);
+        Ok(JsQingTingFM(decipher))
+    }
+
+    /// Decrypt encrypted buffer part.
+    pub fn decrypt(&self, buffer: &mut [u8], offset: usize) {
+        self.0.decrypt(buffer, offset)
+    }
+}