Sum array example

[jimouris]

Add an external-IO use-case (as mentioned in issue #66 )

Each client sends an array (ExternalIO/sum-client-array.cpp) to the players (Programs/Source/sum-array.mpc), players compute the sum of the arrays (using MPC) and return it to the clients.

Example:
data1.txt has [1, 2, 3, 4, 5]
data2.txt has [6, 7, 8, 9, 10]

Usage:

./Scripts/setup-online.sh
./compile.py sum-array
./Scripts/run-online.sh sum-array

./sum-client-array.x 123 2 ./ExternalIO/data1.txt 0
./sum-client-array.x 456 2 ./ExternalIO/data2.txt 1

And the result:

Array with sum of clients arrays is :
7 9 11 13 15 

[mkskeller]

Hi, I'm reluctant the merge this, not because of its content but firstly because SPDZ-2 is considered inactive and secondly because I'm not affiliated with Bristol anymore. However, I'm happy to look into it if you get it to work in https://github.com/n1analytics/mp-spdz. MP-SPDZ preserves all the functionality of SPDZ-2, so I don't see a reason why it shouldn't work.

[jimouris]

Hi, despite the fact that the repository is considered inactive, I thought that an array example would be useful to exist. Anyway, I will create a similar PR in MP-SPDZ when I have the time to.