lucasmenendez / gopaillier

Simple homomorphic encryption based on Paillier cryptosystem implementation in Go. Supports floating point numbers, addition, subtraction, multiplication and division.

GoPaillier

Extended version of a Paillier cryptosystem implementation in Go.

Features

• Extended Paillier cryptosystem implementation with negative number support (read more here).
• Uses Standard Form notation to encode numbers allowing to use Paillier encryption scheme over integer and floating points numbers (read more about number package here).
• Allows four different operations:
  • Addition between encrypted and plain numbers: A' + B.
  • subtraction between encrypted and plain numbers: A' + (-B).
  • Multiplication between encrypted and plain numbers: A' * B.
  • Division between encrypted and plain numbers: A' * 1/B.

Installation

go get github.com/lucasmenendez/gopaillier@latest

Examples

There are three basic examples ready to help starting with the library:

• Basic Paillier example: Source code.
• Median example: Source code.
• SDK example: Source code.

gopaillier's Issues

Why the AddEncrypt is not supported in the SDK

Thank you for your good work for go paillier.
It's very useful for make float number operation with the SDK.
But I'm curious why the AddEncrypt is not supported?

Dead loop for 0

Hello, Lucas , I found another problem when setInt with 0 in number.go
It's a dead loop for it.

So it's better to check it before loop.

if input != 0 {
	for new(big.Int).Mod(bInput, iTen).Cmp(iZero) == 0 {
		bInput.Div(bInput, iTen)
		exp++
	}
}