search

italia / cie-PN532

Arduino library for SPI and I2C access to the NFC chip in the Italian Electronic Identity Card (CIE)
BSD 3-Clause "New" or "Revised" License
23 stars 8 forks source link

Document dependency on BigNumber.h #4

Closed alranel closed 6 years ago

alranel commented 6 years ago

Compilation requires the BigNumber library which I found here:

https://github.com/nickgammon/BigNumber

This dependency should be documented.

BrightSoul commented 6 years ago

The BigNumber class wasn't really needed, so I removed its reference from the cie_PN532.h file and documentation is not needed. BigNumber was used in a previous attempt at performing modular exponentiation without a dedicated chip. The attempt failed on an Arduino UNO due to unsufficient memory (just 2 KBs of SRAM) and I think it won't ever be able to make the calculation needed to verify the CIE is genuine.

CIE verification will be supported only on an Arduino MRK1000 which has dedicated hardware to perform this task in a timely manner. The guys from IPZS are going to update the codebase soon to add this feature.