加密类工具_.NET_编程开发_程序员俱乐部

5.SHA1加密

class="prettyprint">has-numbering">//sha1加密
    public static String getSha1(String str){
        if(str==null||str.length()==0){
            return null;
        }
        char hexDigits[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};

        try {
            MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
            mdTemp.update(str.getBytes("UTF-8"));
            byte[] md = mdTemp.digest();
            int j = md.length;
            char buf[] = new char[j*2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
                buf[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(buf);
        } catch (Exception e) {
            return null;
        }
    }

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6.MD5加密工具类：

package com.huihui.util;

import java.security.MessageDigest;

/**
 * MD5加密工具类
 * @author Administrator
 *
 */
public class Md5Util {
    public final static String MD5(String s){
        char hexDigits[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'}; 
        try {
            byte[] strTemp = s.getBytes();
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");
            mdTemp.update(strTemp);
            byte[] md = mdTemp.digest();
            int j = md.length;
            char str[] = new char[j*2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0>>>4&0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);

        } catch (Exception e) {
            return null;
        }
    }

    public static void main(String[] args) {
        System.out.println(Md5Util.MD5("b"));
    }
}