Android中PIN和PUK码解锁研究
由于目前手头没有真机，只是在模拟器上修改部分telephony代码来调出请求输入PIN码的界面。具体方法：修改external/qemu/telephony/sim_card.c中的asimcard_create()函数，将card-&status =
A_SIM_STATUS_READY改为card-&status =
A_SIM_STATUS_PIN，然后重新编译代码生成image，启动模拟器就直接进入PIN码解锁界面。
PIN码解锁界面属于Phone Policy的一部分，代码位置在
framework/base/policy/src/com/android/internal/policy/SimUnlockScreen.java。当用户输入PIN码按下OK键时，会调用checkPin()函数，通过启动一个线程CheckSimPin来调用TelephonyManager的supplyPin()接口，并注册一个类似于Callback的虚函数onSimLockChangedResponse()并实现之，这样当supplyPin()调用返回时，触发该Callback函数。
supplyPin()接口的具体实现在PhoneInterfaceManager中，代码位置在
packages/apps/Phone/src/com/android/phone/PhoneInterfaceManager.java。首先创建一个线程并启动来维护一个Handler用于接收RIL上来的消息(SUPPLY_PIN_COMPLETE)。随后调用IccCard的supplyPin()方法并将Handler注册上去，此后一直wait，直到Hander收到指定消息后将其唤醒返回，并将操作结果传给其调用者。
&&&&&&&&&如果成功，返回值为true，代表PIN码验证成功。&此时SimUnlockScreen中的onSimLockChangedResponse()方法会被调用，它会通知KeyguardUpdateMonitor去更新SimState的状态为IccCard.State.READY，并通知锁屏程序解锁成功。
&&&&&&&&&如果失败，SimUnlockScreen界面会一直存在，直到连续输入三次失败后，IccCard.java会发出一个Action为”ACTION_SIM_STATE_CHANGED_LOCKED”的广播，由于KeyguardUpdateMonitor对它进行了监听，所以它的onReceive()会被触发，并根据Intent携带的Extras进行SIMState的修改，此时由于reason为“PUK”,故将SIMState置为PUK_
REQUIRED，并触发所有注册监听SIM状态改变的Callback。KeyguardViewMediator的onSimStateChanged()被调用，由于SIMState状态为PUK_
REQUIRED，所以屏幕Mode被设置为LockScreen此时会进入锁屏界面按道理此时需要输入PUK码进行PIN码的修改。但是由于目前的流程中没有对PUK码的请求输入进行处理，所以导致锁屏界面解锁后整个界面不可操作，具体原因可能要调查现有的锁屏程序，不过据我所知目前Android原生态的锁屏都有这个问题，即一旦PIN码锁住之后，手机使用不了，必须将SIM拔出在支持PUK解锁的手机上解锁之后才可以继续使用。
&&&&&&&&&另外目前底层包括framework中均已支持PUK码的解锁，所以工作量都集中在应用程序及锁屏的部分代码中，有些问题可能还需要锁屏来支持。其实目前PUK解锁方式可以通过在紧急拨号盘中输入”**05*PUK*PIN*PIN#”来完成，只不过一般用户根本不知道和使用这个功能。所以需要自己来实现一套PUK码解锁界面，从目前来看放在Keyguard中比较合适。
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Copyright (C) 2012- All Rights ReservedGuangzhou Songpin Tent Technology Co.,Ltd (China Manufacturer) - Company Profile
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Guangzhou Songpin Tent Technology Co.,Ltd
Company Description
Business Type: Manufacturer, Trading Company
Main Products:
Tent (Wedding Tent,Party Tent,Outdoor Tent,Exhibition Tent,Warehouse Tent,Event Tent)
Location: Guangdong, China (Mainland)
Year Established: 2012
Year start exporting: 2007
Number Of Employees: 101 - 200 People
Total Annual Sales Volume: confidential
Main Markets: Africa, Oceania, Mid East, Western Europe, Northern Europe
Average Lead Time: 15 Day(s)
Guangzhou Songpin Tent Technology Co., Ltd was established in 2007, covers an area of more than 5000 square meters and is located in Port Industrial Zone, Xinhua Town, Huadu District, Guangzhou City, Guangdong Province with convenient transportation. We are close to Guangzhou Baiyun Airport, north to Guangzhou Train Station and Kwong-Ching Highway (Xinhua Exit). It only takes 30 minutes from our firm to Baiyun Airport by car.
As a professional tent and umbrella manufacturer, we have R&D, Design, Production, Marketing and Export departments. Our sales market covers mainland China, Hong Kong, Macao and Taiwan area. For exporting, our products sell well in North America, Europe, South Africa, and Australia. Our main famous brand partners include PepsiCo, Coca Cola, Wahaha, Robust, Mengniu, Tsingtao Beer, CR Snow Beer, and Masterkong.
Our main products are party tent, pagoda tent, aluminum tent, event tent, exhibition tent, banquet tent, PVC tent, instant tents, promotion tents, party tents, advertising umbrellas, beach umbrellas, patio umbrellas, golf umbrellas, sun umbrellas, wooden umbrellas, folding umbrellas, gift umbrellas. All of our products can be printed with logos from the clients. With our advanced silk-screen, painting, and heat-transfer printing technology, we can make goods as per your ideas for advertising. We will make your advertising promotion successful!
Pursuing the guideline of "Professional Service, Good Quality Products, Reasonable Prices", we sincerely look forward to establishing a long-lasting relationship with clie
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