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package com.hn.pay.wxpay.utils;

import java.security.MessageDigest;

public class HashKit {
	
	private static final java.security.SecureRandom random = new java.security.SecureRandom();
	private static final char[] HEX_DIGITS = "0123456789abcdef".toCharArray();
	private static final char[] CHAR_ARRAY = "_-0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();

	/**
	 *  md5加密
	 * @param srcStr srcStr
	 * @return 加密后字符串
	 */
	public static String md5(String srcStr){
		return hash("MD5", srcStr);
	}


	/**
	 *
	 * @param algorithm algorithm
	 * @param srcStr srcStr
	 * @return {String}
	 */
	public static String hash(String algorithm, String srcStr) {
		try {
			MessageDigest md = MessageDigest.getInstance(algorithm);
			byte[] bytes = md.digest(srcStr.getBytes("utf-8"));
			return toHex(bytes);
		}
		catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	/**
	 *  toHex
	 * @param bytes bytes
	 * @return 十六进制
	 */
	private static String toHex(byte[] bytes) {
		StringBuilder ret = new StringBuilder(bytes.length * 2);
		for (int i=0; i> 4) & 0x0f]);
			ret.append(HEX_DIGITS[bytes[i] & 0x0f]);
		}
		return ret.toString();
	}

	/**
	 *  slowEquals
	 * @param a a
	 * @param b b
	 * @return true or false
	 */
	public static boolean slowEquals(byte[] a, byte[] b) {
		if (a == null || b == null) {
			return false;
		}
		
		int diff = a.length ^ b.length;
		for(int i=0; i