This android-studio project only ported libsnark to arm64. armeabi-v7a(arm32) have some error at prove and verify.
use ALT_BN128. more detail https://github.com/scipr-lab/libsnark
vi ~/your-workspace/snarkportingtest/app/build.gradle
- ANDROID_TOOLCHAIN=4.7 : Select compiler version
- _ANDROID_STL=c++shared : If you link library, you need this option
- WITH_PROCPS=OFF : libprocps is not necessary to link the library.
- CURVE=ALT_BN128 : use ALT_BN128
- WITH_SUPERCOP=OFF : supercop is assembly language.(can't use at arm machine)
- OPT_FLAGS=-Os -march=armv8-a : select machine
- PERFORMANCE=ON : OFF DEBUG MODE
- MINIMUM SDK VERSION : 23(ANDROID 6.0 Marshmallow)
- NDK VERSION : 21.3.6528147
- Android Gradle Plugin Version : 4.0.1
- Gradle Version : 6.1.1
use https://github.com/snp-labs/CRV
build libsnark library as command
cmake -DCURVE=ALT_BN128 -DWITH_PROCPS=OFF -DWITH_SUPERCOP=OFF -DMULTICORE=OFF -DUSE_ASM=OFF -DBINARY_OUTPUT=ON -DMONTGOMERY_OUTPUT=OFF ..
these cmake options must be defined to use CRS and proofs derived from Android
copy your CRS and proofs to ~/your-workspace/CRV/JsnarkCircuitBuilder/datafiles
use command described in link above to run libsnark library