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# Introduction
This folder contains code for Porthos - a semi-honest 3 party secure computation protocol.
# Setup
(Ubuntu):
* sudo apt-get install libssl-dev
* sudo apt-get install g++
* sudo apt-get install make
# Running the protocol
- To compile use `make clean && make -j`.
- Currently the codebase contains precompiled code the following 3 neural networks: ResNet-50, DenseNet-121 and SqueezeNet for ImageNet, checked into the following folder: `./src/example_neural_nets`. Toggle the flag in `./src/example_neural_nets/network_config.h` to switch the network which runs. Note that if there is more than one network flag uncommented (meaning ON) or if there is already a main file in src, the compilation will error out saying multiple declarations of main function.
- To run for example the ResNet-50 code, use the following commands:
`./party0.sh < ../Athos/Networks/ResNet/ResNet_img_input.inp`,
`./party1.sh`, and
`./party2.sh`.
Note that the first command makes use of input generated from Athos. Please refer to the Athos readme on how to do the same.
# Notes
- If porthosSecretType != uint64_t, porthosSecretType multiplication function won't work.
- Possible instructions for installation of libssl on Mac, though untested.
-- brew install libssl
-- cd /usr/local/include
-- ln -s ../opt/openssl/include/openssl .
Also, use the second build command for Mac to be safe. Read the Caveats part of brew install instructions, since Apple has deprecated the use of OpenSSL.
- When extracting bits out of \_\_m128i, val[0] corresponds to the LSB. The set functions of \_\_m128i take the first argument as val[0].
- Matrix multiplication assembly code only works for Intel C/C++ compiler. The non-assembly code has correctness issues when both the multiplicands are large uint64_t's