dedis/kyber, a golang implementation of Kyber crypto lib (NOTE this is not to be confused with the pq-crystals Kyber PQ KEM)

Noémien Kocher 4e19b71bd4 Merge pull request #459 from seafooler/master 7 months ago
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examples 0aef776bdc Merge branch 'master' into patch-1 2 years ago
group 6a0ad452aa Jeff's Comments 1 year ago
pairing 29b3a97b4a Adding simpler test 1 year ago
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LICENSE 2e259b283b added mpl-v2 license 5 years ago
Makefile a0aa572ec5 Makefile: use upstream version 2 years ago 49d0788ed0 Update 1 year ago
doc.go c97e3ddd46 Add a security reporting address. 3 years ago
encoding.go e3423ee8bb Update for new module import paths 3 years ago
go.mod a5a2914d82 Do not depend on confused protobuf v1.0.10. 2 years ago
go.sum e636375d94 Fix go.sum 2 years ago
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hash.go 91b23e8e89 Documentation fixes. 4 years ago
random.go 53b9299885 Update docs for v1 release. 4 years ago
xof.go 34069cf003 Fixes from code review from Linus. 4 years ago

Docs Build Status

DEDIS Advanced Crypto Library for Go

This package provides a toolbox of advanced cryptographic primitives for Go, targeting applications like Cothority that need more than straightforward signing and encryption. Please see the Godoc documentation for this package for details on the library's purpose and API functionality.

This package includes a mix of variable time and constant time implementations. If your application is sensitive to timing-based attacks and you need to constrain Kyber to offering only constant time implementations, you should use the suites.RequireConstantTime() function in the init() function of your main package.

Versioning - Development

We use the following versioning model:

  • crypto.v0 was the first semi-stable version. See migration notes.
  • kyber.v1 never existed, in order to keep kyber, onet and cothorithy versions linked
  • was the last stable version
  • Starting with v3.0.0, kyber is a Go module, and we respect semantic versioning.

So if you depend on the master branch, you can expect breakages from time to time. If you need something that doesn't change in a backward-compatible way you should use have a go.mod file in the directory where your main package is.

Using the module

Kyber supports Go modules, and currently has a major version of 3, which means that the import path is:

Here is a basic example of getting started using it:

  1. Make a new directory called “ex". Change directory to “ex" and put this in main.go: ```go package main

import (



func main() {

s := suites.MustFind("Ed25519")
x := s.Scalar().Zero()

} ```

  1. Type “go mod init”. The resulting go.mod file will have no dependencies listed yet.
  2. Type “go build”. The go tool will fill in the new dependencies that it find for you, i.e. "require v3.0.13”.
  3. Running ./ex will print 0000000000000000000000000000000000000000000000000000000000000000.

A note on deriving shared secrets

Traditionally, ECDH (Elliptic curve Diffie-Hellman) derives the shared secret from the x point only. In this framework, you can either manually retrieve the value or use the MarshalBinary method to take the combined (x, y) value as the shared secret. We recommend the latter process for new softare/protocols using this framework as it is cleaner and generalizes across different types of groups (e.g., both integer and elliptic curves), although it will likely be incompatible with other implementations of ECDH. See the Wikipedia page on ECDH.

Reporting security problems

This library is offered as-is, and without a guarantee. It will need an independent security review before it should be considered ready for use in security-critical applications. If you integrate Kyber into your application it is YOUR RESPONSIBILITY to arrange for that audit.

If you notice a possible security problem, please report it to