Computes a salted PBKDF2 hash of given plain text password suitable for storing in a database. - Android java.security

Android examples for java.security:Password

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Description

Computes a salted PBKDF2 hash of given plain text password suitable for storing in a database.

Demo Code


//package com.java2s;
import android.util.Base64;
import java.security.SecureRandom;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

public class Main {
    private static final int iterations = 1000;
    private static final int saltLen = 32;
    private static final int desiredKeyLen = 256;

    /**/*  w ww  . j av  a  2s.  c om*/
     * Computes a salted PBKDF2 hash of given plaintext password suitable for storing in a database. Empty passwords are not supported.
     *
     * @param password
     * @return
     * @throws Exception
     */
    public static String getSaltedHash(String password) throws Exception {
        byte[] salt = SecureRandom.getInstance("SHA1PRNG").generateSeed(
                saltLen);
        // store the salt with the password
        return Base64.encodeToString(salt, Base64.NO_WRAP) + "$"
                + hash(password, salt);
    }

    private static String hash(String password, byte[] salt)
            throws Exception {
        if (password == null || password.length() == 0) {
            throw new IllegalArgumentException(
                    "Empty passwords are not supported.");
        }
        SecretKeyFactory f = SecretKeyFactory
                .getInstance("PBKDF2WithHmacSHA1");
        SecretKey key = f.generateSecret(new PBEKeySpec(password
                .toCharArray(), salt, iterations, desiredKeyLen));
        return Base64.encodeToString(key.getEncoded(), Base64.NO_WRAP);
    }
}

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