(Android™) BCrypt Verify a Password (Check if Password is Correct)

A system that uses BCrypt for storing passwords would not store the actual password, but would instead store the bcrypt hash of the password. When a user presents the password, such as for login, call BCryptVerify to verify the password against the stored bcrypt hash.

Note: This example requires Chilkat v9.5.0.65 or greater.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    String storedHash = "$2a$10$H5kIVktMGzAPKGKNAe9DVu0iwEqfhv/o4MMJ/Dzw/MPy1leOE9NOK";
    String password = "mySecretPassword";

    boolean passwordValid = crypt.BCryptVerify(password,storedHash);
    if (passwordValid == true) {
        Log.i(TAG, password + " is valid.");
        }
    else {
        Log.i(TAG, password + " is NOT valid.");
        }

    password = "notAValidPassword";
    passwordValid = crypt.BCryptVerify(password,storedHash);
    if (passwordValid == true) {
        Log.i(TAG, password + " is valid.");
        }
    else {
        Log.i(TAG, password + " is NOT valid.");
        }

    // Output should be:

    // 	mySecretPassword is valid.
    // 	notAValidPassword is NOT valid.

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}