Sha256.java

package com.aperture_software.glados_wiki.support;

import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;
import org.apache.shiro.crypto.RandomNumberGenerator;
import org.apache.shiro.crypto.SecureRandomNumberGenerator;
import org.apache.shiro.crypto.hash.Sha256Hash;
import org.apache.shiro.util.ByteSource;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.Vector;

/**
 * Created by jhyun on 13. 12. 24.
 */
@Component
public class Sha256 {

    public static final int HASH_ITERATION = 1024;

    private List<Byte> toBytes(final ByteSource byteSource) {
        Vector<Byte> v = new Vector<Byte>();
        for (byte b : byteSource.getBytes()) {
            v.add(b);
        }
        return v;
    }

    public Pair<List<Byte>, String> getSaltAndHash(final String plainTextPassword) {
        RandomNumberGenerator rng = new SecureRandomNumberGenerator();
        final ByteSource salt = rng.nextBytes();
        final String hashedPasswordBase64 = new Sha256Hash(plainTextPassword, salt, HASH_ITERATION).toBase64();
        return new ImmutablePair<List<Byte>, String>(toBytes(salt), hashedPasswordBase64);
    }

}