test_hasher

Simple Android x86 hasher implementation. Hashing logic is implemented using 256 bytes chunks and then checked against stock crypto_generalhash implementation. Project is organized using ndk-build system. Tested on Arch Linux with Nexus 5 x86 Android (29 API).

Requirements

• libsodium 1.0.18 -> https://download.libsodium.org/libsodium/releases/libsodium-1.0.18-stable.tar.gz,
• Android NDK 18b -> https://dl.google.com/android/repository/android-ndk-r18b-linux-x86_64.zip,
• greatest unit test library -> https://github.com/silentbicycle/greatest/tree/7f89ba4c5fdb5c6b776d5d8e4dcb17cb77cbe789 Resulting binary is statically linked with libsodium and libhasher (hashing logic implementation).

Project structure

• ./makefiles -> entry points for ndk-build configuration
• ./src/greatest -> unit test library and simple tests (statically linked with libsodium and libhasher)
• ./src/hasher -> hashing logic implementation which results to libhasher Android x86 library for static linking
• ./src/main -> main execution logic and arguments parse (statically linked with libsodium and libhasher)
• ./src/sodium -> compiled Android x86 library for static linking (compilation routine in build.sh file)

Compilation

Compilation script compiles libsodium using $LIBSODIUM_SRC/dist-build/android-x86.sh, then places libsodium.a and header files into ./src/sodium. After that compilation proceeds using ndk-build.

$ ANDROID_NDK_HOME=<SET_YOUR_ANDROID_NDK_HOME> LIBSODIUM_SRC=<SET_YOUR_LIBSODIUM_SRC_DIRECTORY> PROJECT_DIR=<SET_PROJECT_PATH> /path/to/build.sh

(example: $ ANDROID_NDK_HOME=/home/user/android-ndk-r18b LIBSODIUM_SRC=/home/user/libsodium-stable PROJECT_DIR=/home/user/test_hasher /home/user/test_hasher/build.sh )

After that push $PROJECT_DIR/libs/x86/main and $PROJECT_DIR/libs/hasher_unittest via adb and execute:

$ adb push $PROJECT_DIR/libs/x86/hasher_unittest /data/local/tmp $ adb push $PROJECT_DIR/libs/x86/main /data/local/tmp $ adb shell

Usage

Inside adb shell: $$ cd /data/local/tmp $$ ./hasher_unittest $$ ./main 123 (result must be "F5D67BAE73B0E10D0DFD3043B3F4F100ADA014C5C37BD5CE97813B13F5AB2BCF" without quotes, hex-encoded )