HashUtils.java

package cn.liutils.util.generic;

import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import cn.liutils.core.LIUtils;

/**
 * Provides some hash functions
 * @author EAirPeter
 */
public enum HashUtils {
    MD5("MD5"),
    SHA1("SHA1");
    
    private final MessageDigest MD;
    
    private HashUtils(String alg) {
        MessageDigest md = null;
        try {
            md = MessageDigest.getInstance(alg);
        }
        catch (NoSuchAlgorithmException e) {
            LIUtils.log.error("Failed to initialize HashUtils." + alg, e);
        }
        MD = md;
    }
    
    public byte[] hash(byte[] src) {
        return MD.digest(src);
    }
    
    public byte[] hash(InputStream src) {
        return hash(readBytes(src));
    }
    
    public static byte[] readBytes(InputStream src) {
        byte[] bytes = null;
        try {
                int count = src.available();
            bytes = new byte[count];
            if (src.read(bytes) != count)
                throw new RuntimeException("Java sucks");
        }
        catch (Exception e) {
            throw new RuntimeException("Failed to read all bytes from InputStream", e);
        }
        return bytes;
    }

}