com.licc.common.util.Digests.java Source code

Introduction

Here is the source code for com.licc.common.util.Digests.java

Source

/*******************************************************************************
 * Copyright (c) 2005, 2014 springside.github.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 *******************************************************************************/
package com.licc.common.util;

import org.apache.commons.lang3.Validate;

import java.io.IOException;
import java.io.InputStream;
import java.security.GeneralSecurityException;
import java.security.MessageDigest;
import java.security.SecureRandom;

/**
 * ?SHA-1/MD5??.
 * 
 * ByteSource??Hex, Base64UrlSafeBase64
 * 
 * @author calvin
 */
public class Digests {

    private static final String SHA1 = "SHA-1";
    private static final String MD5 = "MD5";

    private static SecureRandom random = new SecureRandom();

    /**
     * sha1.
     */
    public static byte[] sha1(byte[] input) {
        return digest(input, SHA1, null, 1);
    }

    public static byte[] sha1(byte[] input, byte[] salt) {
        return digest(input, SHA1, salt, 1);
    }

    public static byte[] sha1(byte[] input, byte[] salt, int iterations) {
        return digest(input, SHA1, salt, iterations);
    }

    /**
     * , ?md5sha1.
     */
    private static byte[] digest(byte[] input, String algorithm, byte[] salt, int iterations) {
        try {
            MessageDigest digest = MessageDigest.getInstance(algorithm);

            if (salt != null) {
                digest.update(salt);
            }

            byte[] result = digest.digest(input);

            for (int i = 1; i < iterations; i++) {
                digest.reset();
                result = digest.digest(result);
            }
            return result;
        } catch (GeneralSecurityException e) {
            throw Exceptions.unchecked(e);
        }
    }

    /**
     * ??Byte[]salt.
     * 
     * @param numBytes byte?
     */
    public static byte[] generateSalt(int numBytes) {
        Validate.isTrue(numBytes > 0, "numBytes argument must be a positive integer (1 or larger)", numBytes);

        byte[] bytes = new byte[numBytes];
        random.nextBytes(bytes);
        return bytes;
    }

    /**
     * md5.
     */
    public static byte[] md5(InputStream input) throws IOException {
        return digest(input, MD5);
    }

    /**
     * sha1.
     */
    public static byte[] sha1(InputStream input) throws IOException {
        return digest(input, SHA1);
    }

    private static byte[] digest(InputStream input, String algorithm) throws IOException {
        try {
            MessageDigest messageDigest = MessageDigest.getInstance(algorithm);
            int bufferLength = 8 * 1024;
            byte[] buffer = new byte[bufferLength];
            int read = input.read(buffer, 0, bufferLength);

            while (read > -1) {
                messageDigest.update(buffer, 0, read);
                read = input.read(buffer, 0, bufferLength);
            }

            return messageDigest.digest();
        } catch (GeneralSecurityException e) {
            throw Exceptions.unchecked(e);
        }
    }

    public static String md5(String str) {
        try {
            MessageDigest e = MessageDigest.getInstance("MD5");
            e.update(str.getBytes());
            byte[] b = e.digest();
            StringBuffer buf = new StringBuffer("");

            for (int offset = 0; offset < b.length; ++offset) {
                int i = b[offset];
                if (i < 0) {
                    i += 256;
                }

                if (i < 16) {
                    buf.append("0");
                }

                buf.append(Integer.toHexString(i));
            }
            str = buf.toString();
        } catch (Exception var6) {
            var6.printStackTrace();
        }

        return str;
    }
}