Someone wrote that you can't emulate cards on Nexus S (or maybe only mifare ultralight cards), even if you have the opennfc driver and the rest of it set up. Any comments on this?
On 6 April 2012 17:16, Nikolay Elenkov <nikolay.elen...@gmail.com> wrote: > On Fri, Apr 6, 2012 at 10:06 PM, xanium4332 <xanium4...@gmail.com> wrote: > > > > > I've recently read through a lot of information regarding the > implementation > > of NFC, Google Wallet, card emulation etc.. on the Galaxy S > > Nice write up, you should put it in a blog post somewhere. Sounds about > right, but can't really commend on the finer points. Maybe someone else > will. > You might also get better info/response on XDA. This list is not exactly > dedicated to analyzing third party apps and/or hardware. > > > > > Now for things I'm not sure about: > > > > Does Google Wallet make use of native APIs or Java APIs to communicate to > > the secure element. I.e., is it talking to the NXP NFC stack directly, or > > through some Android-like API? > > AFAIK, it uses only Java code. You can send APDU via the Java APIs, > so that's basically all you need. > > > > > People who are receiving the 'secure element not responding' error are > > presumably failing to authenticate with the Google Wallet javacard app > which > > has been installed. However, people seem to be mentioning that this error > > means the SE is 'bricked', which I would interpret as the lockout from > the > > GlobalPlatform app due to 10 failed auths. Anybody know exactly what is > > going on here? > > You can't say for sure until you see the response APDU. IIRC, if you lock > the card you will get 'Security condition not satisfied', SW= 0x6982. > If seen this a few times :) > > > > > I think I read somewhere that the google wallet javacard app is only > > installed onto the SE after successful setup of the Google Wallet app. > I.e. > > it is not factory installed. > > This appears to be correct. > > > If so, how does secure communication occur with > > the GlobalPlatform app. Does Google Wallet perform this (I guess not, as > we > > could find the keys from the APK). How do the GlobalPlatform keys get > > securely transmitted to the SE? With SIM cards I think binary SMSs are > used > > to OTA chat with the radio interface, but obviously that can't happen > here. > > > > You don't really need to transmit the actual keys to the card, you only > need to > compute the correct session key based on the card manager key. Maybe they > are in the APK (unlikely), or processing is offloaded to a server. You > might > want to look yourself :) > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
