Modernise Romulus-M implementation and improve error handling

tests/romulus-m-reference.test.ts

@@ -5,13 +5,12 @@ import {
   DecryptResult,
 } from "../src/romulus-m";
 
-function parseHexString(string: string): number[] {
-  const ret = [];
+function parseHexString(string: string): Uint8Array {
+  const bytes: number[] = [];
   for (let i = 0; i < string.length; i += 2) {
-    ret.push(parseInt(string.slice(i, i + 2), 16));
+    bytes.push(parseInt(string.slice(i, i + 2), 16));
   }
-
-  return ret;
+  return new Uint8Array(bytes);
 }
 
 test.each(referenceTests)(
@@ -27,7 +26,7 @@ test.each(referenceTests)(
 
     // Then
     const expectedResult = parseHexString(ciphertext);
-    expect(result).toMatchObject(expectedResult);
+    expect(result).toEqual(expectedResult);
   },
 );
 
@@ -47,6 +46,6 @@ test.each(referenceTests)(
       success: true,
       plaintext: parseHexString(plaintext),
     };
-    expect(result).toMatchObject(expectedResult);
+    expect(result).toEqual(expectedResult);
   },
 );