adding argon2 verify

Author: WingZer0o

package-lock.json

@@ -4,16 +4,29 @@ import koffi  from "koffi";
 export class Argon2Wrapper {
   private lib;
   private argon2_hash: Function;
+  private argon2_verify: Function;
 
   constructor() {
     this.lib = (os.platform() === "win32") ? koffi.load(global.pathToWindowsDll) : koffi.load(global.pathToLinuxSO);
-    this.argon2_hash = this.lib.func("argon2_hash", 'string', ['string'])
+    this.argon2_hash = this.lib.func("argon2_hash", 'string', ['string']);
+    this.argon2_verify = this.lib.func("argon2_verify", 'int8', ['string', 'string']);
   }
 
-  public hashPassword(passwordToHash: string): string | null {
+  public hashPassword(passwordToHash: string): string {
     if (!passwordToHash) {
         throw new Error("You must provide a password to hash");
     }
     return this.argon2_hash(passwordToHash);
   }
+
+  public verifyPassword(hashedPassword: string, passwordToVerify: string): boolean {
+    if (!hashedPassword || !passwordToVerify) {
+      throw new Error("You must provide a hashed password and a non hash password to verify with Argon2");
+    }
+    let result: number = this.argon2_verify(hashedPassword, passwordToVerify);
+    if (result == 0)
+      return false;
+    else 
+      return true;
+  }
 }