一般我们把密码存在数据库里都是采用加密的方式，确保了即使数据库泄漏，不法分子也无法登录帐号。常见的加密算法有MD5,SHA1等，本篇博客将给大家讲解如何在Shiro中使用MD5算法给密码加密。

POM

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.jk.shiroLearning</groupId>
    <artifactId>chapter4</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.9</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.1.3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-core</artifactId>
            <version>1.2.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.25</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>0.2.23</version>
        </dependency>
    </dependencies>

</project>

shiro-realm.ini

[main]
#自定义authorizer
authorizer=org.apache.shiro.authz.ModularRealmAuthorizer
securityManager.authorizer=$authorizer

#自定义realm 一定要放在securityManager.authorizer赋值之后（因为调用setRealms会将realms设置给authorizer，并给各个Realm设置permissionResolver和rolePermissionResolver）
realm=com.jk.realm.MyRealm
#配置加密匹配器
credentialsMatcher=org.apache.shiro.authc.credential.HashedCredentialsMatcher
#加密算法
credentialsMatcher.hashAlgorithmName=MD5
#加密次数
credentialsMatcher.hashIterations=1024
realm.credentialsMatcher=$credentialsMatcher

securityManager.realms=$realm

配置比以前多了加密匹配器的部分

自定义Realm

public class MyRealm extends AuthorizingRealm {

    //授权,调用checkRole/checkPermission/hasRole/isPermitted都会执行该方法
    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
        SimpleAuthorizationInfo authorizationInfo = new SimpleAuthorizationInfo();
        //可通过不同principal赋予不同权限
        if (principals.getPrimaryPrincipal().equals("jack")){
            //授予角色role1
            authorizationInfo.addRole("role1");
            authorizationInfo.addRole("role2");
            //授予对user任何行为任何实例的权限
            authorizationInfo.addObjectPermission(new WildcardPermission("user:*"));
            //等同于
            //authorizationInfo.addStringPermission("user:*");
        }
        return authorizationInfo;
    }

    //认证
    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) throws AuthenticationException {
        String username = (String)token.getPrincipal();  //得到用户名
        //加密算法
        String hashAlgorithName="MD5";
        //加密明文
        String credentials="123456";
        //加密盐值
        ByteSource salt = null;
        //加密盐值
        //盐值通常取唯一的，我们这用用户名作为盐值
        //ByteSource salt= ByteSource.Util.bytes(username);
        //加密次数
        int hashIterations = 1024;
        Object password = new SimpleHash(hashAlgorithName,credentials,salt,hashIterations);
        return new SimpleAuthenticationInfo(username, password, getName());
    }
}

在一般开发过程中我们不会直接用MD5加密，还要加上一个盐值，这个盐值一般是唯一的。

验证登录

public class UseMD5 {
    public static void main(String[]args){
        //1、获取SecurityManager工厂，此处使用Ini配置文件初始化SecurityManager
        Factory<SecurityManager> factory =
                new IniSecurityManagerFactory("classpath:shiro-realm.ini");

        //2、得到SecurityManager实例 并绑定给SecurityUtils
        org.apache.shiro.mgt.SecurityManager securityManager = factory.getInstance();
        SecurityUtils.setSecurityManager(securityManager);

        //3、得到Subject及创建用户名/密码身份验证Token（即用户身份/凭证）
        Subject subject = SecurityUtils.getSubject();
        //登录信息传密码明文
        UsernamePasswordToken token = new UsernamePasswordToken("jack", "123456");

        try {
            //4、登录，即身份验证
            subject.login(token);
            //验证是否有user1的create权限
            System.out.println(subject.isPermitted("user1:create:*"));
            //验证是否有role1角色
            System.out.println(subject.hasRole("role1"));
        } catch (AuthenticationException e) {
            //5、身份验证失败
            e.printStackTrace();
        }
        //6、退出
        subject.logout();
    }
}

登录时我们传的是明文123456，校验时比较的是用MD5加盐用户名加密1024次后的值

开发中我们一般会采用数据库储存用户名，加密后密码还要盐值，，需要使用到JdbcRealm

首先执行sql语句创建数据库并插入数据

drop database if exists shiro;
create database shiro;
use shiro;

create table users (
  id bigint auto_increment,
  username varchar(100),
  password varchar(100),
  password_salt varchar(100),
  constraint pk_users primary key(id)
) charset=utf8 ENGINE=InnoDB;
create unique index idx_users_username on users(username);

create table user_roles(
  id bigint auto_increment,
  username varchar(100),
  role_name varchar(100),
  constraint pk_user_roles primary key(id)
) charset=utf8 ENGINE=InnoDB;
create unique index idx_user_roles on user_roles(username, role_name);

create table roles_permissions(
  id bigint auto_increment,
  role_name varchar(100),
  permission varchar(100),
  constraint pk_roles_permissions primary key(id)
) charset=utf8 ENGINE=InnoDB;
create unique index idx_roles_permissions on roles_permissions(role_name, permission);

insert into users(username, password, password_salt) values('jack', 'fc1709d0a95a6be30bc5926fdb7f22f4', 'jack');
insert into user_roles(username, role_name) values('jack', 'role1');
insert into user_roles(username, role_name) values('jack', 'role2');
insert into roles_permissions(role_name, permission) values('role1', 'user1:*');
insert into roles_permissions(role_name, permission) values('role1', 'user2:*');
insert into roles_permissions(role_name, permission) values('role2', 'user3:*');

shiro-jdbc.ini

[main]
authorizer=org.apache.shiro.authz.ModularRealmAuthorizer
securityManager.authorizer=$authorizer

#自定义realm 一定要放在securityManager.authorizer赋值之后（因为调用setRealms会将realms设置给authorizer，并给各个Realm设置permissionResolver和rolePermissionResolver）
jdbcRealm=org.apache.shiro.realm.jdbc.JdbcRealm
dataSource=com.alibaba.druid.pool.DruidDataSource
dataSource.driverClassName=com.mysql.jdbc.Driver
dataSource.url=jdbc:mysql://localhost:3306/shiro
dataSource.username=root
dataSource.password=root
jdbcRealm.dataSource=$dataSource
jdbcRealm.permissionsLookupEnabled=true

#配置加密匹配器
credentialsMatcher=org.apache.shiro.authc.credential.HashedCredentialsMatcher
#加密算法
credentialsMatcher.hashAlgorithmName=MD5
#加密次数
credentialsMatcher.hashIterations=1024
jdbcRealm.credentialsMatcher=$credentialsMatcher

securityManager.realms=$jdbcRealm

这个也是比之前的多了配置加密匹配器

校验登录

public class UseJdbcMD5 {
    public static void main(String[]args){
        //1、获取SecurityManager工厂，此处使用Ini配置文件初始化SecurityManager
        Factory<SecurityManager> factory =
                new IniSecurityManagerFactory("classpath:shiro-jdbc.ini");
        //2、得到SecurityManager实例 并绑定给SecurityUtils
        SecurityManager securityManager = factory.getInstance();
        SecurityUtils.setSecurityManager(securityManager);

        //3、得到Subject及创建用户名/密码身份验证Token（即用户身份/凭证）
        Subject subject = SecurityUtils.getSubject();
        //登录信息传密码明文
        UsernamePasswordToken token = new UsernamePasswordToken("jack", "123456");

        try {
            //4、登录，即身份验证
            subject.login(token);
            //验证是否有user1的create权限
            System.out.println(subject.isPermitted("user1:create:*"));
            //验证是否有role1角色
            System.out.println(subject.hasRole("role1"));
        } catch (AuthenticationException e) {
            //5、身份验证失败
            e.printStackTrace();
        }
        //6、退出
        subject.logout();
    }
}

源码地址：https://github.com/jkgeekJack/shiro-learning/tree/master/chapter4