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https://github.com/docknetwork/crypto

Rust crypto library for data privacy tools
https://github.com/docknetwork/crypto

accumulator anonymous-credentials cryptography delegatable-credentials distributed-key-generation dkg group-signatures oblivious-transfer publicly-verifiable-secret-sharing range-proofs schnorr secret-sharing sigma-protocol signatures structure-preserving-signatures threshold-signatures verifiable-encryption verifiable-secret-sharing zero-knowledge-proofs zk-snarks

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Rust crypto library for data privacy tools

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README 

        
# TBD



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Library providing privacy enhancing cryptographic primitives.



## Primitives



1. [Schnorr proof of knowledge protocol](./schnorr_pok) to prove knowledge of discrete log and inequality of discrete logs. [This](https://crypto.stanford.edu/cs355/19sp/lec5.pdf) is a good reference. 

2. [BBS and BBS+ signatures](./bbs_plus) for anonymous credentials. BBS+ is based on the paper [Anonymous Attestation Using the Strong Diffie Hellman Assumption Revisited](https://eprint.iacr.org/2016/663) and 

   BBS is based on the paper [Revisiting BBS Signatures](https://eprint.iacr.org/2023/275). Also implements the threshold variants of these based on the paper [Threshold BBS+ Signatures for Distributed Anonymous Credential Issuance](https://eprint.iacr.org/2023/602)

3. [Dynamic accumulators, both positive and universal](./vb_accumulator). Based on the papers [Dynamic Universal Accumulator with Batch Update over Bilinear Groups](https://eprint.iacr.org/2020/777) and [Efficient Constructions of Pairing Based Accumulators](https://eprint.iacr.org/2021/638). Implements a keyed-verification variant of these accumulators as well which does not require pairings.

4. [Composite proof system](./proof_system) that combines above primitives for use cases like 

   - prove knowledge of a BBS+ signature and the corresponding messages

   - prove knowledge of a modified PS signature and the corresponding messages

   - equality of signed messages (from same or different signatures) in zero knowledge

   - inequality of signed messages with public or committed values in zero knowledge

   - the (non)membership of a certain signed message(s)in the accumulator

   - numeric bounds (min, max) on the messages can be proved in zero-knowledge 

   - verifiable encryption of signed messages under BBS+ or PS. 

   - zk-SNARK created from R1CS and WASM generated by [Circom](https://docs.circom.io/) with witnesses as BBS+ signed messages (not exclusively though). 

5. [Verifiable encryption](./saver) using [SAVER](https://eprint.iacr.org/2019/1270).

6. [Compression and amortization of Sigma protocols](./compressed_sigma). This is PoC implementation.

7. [Secret sharing schemes and DKG](./secret_sharing_and_dkg). Implements several verifiable secret sharing schemes and DKG from Gennaro and FROST. Also implements protocol to do a distributed DLOG check.

8. [Cocount and PS signatures](./coconut/). Based on the paper [Security Analysis of Coconut, an Attribute-Based Credential Scheme with Threshold Issuance](https://eprint.iacr.org/2022/011)

9. [LegoGroth16](./legogroth16/).  LegoGroth16, the [LegoSNARK](https://eprint.iacr.org/2019/142) variant of [Groth16](https://eprint.iacr.org/2016/260) zkSNARK proof system

10. [Oblivious Transfer (OT) and Oblivious Transfer Extensions (OTE)](./oblivious_transfer).

11. [Short group signatures](./short_group_sig/). BB signature and weak-BB signature and their proofs of knowledge based on the papers [Short Signatures Without Random Oracles](https://eprint.iacr.org/2004/171) and [Scalable Revocation Scheme for Anonymous Credentials Based on n-times Unlinkable Proofs](http://library.usc.edu.ph/ACM/SIGSAC%202017/wpes/p123.pdf).

12. [Keyed-Verification Anonymous Credentials (KVAC)](./kvac). Implements Keyed-Verification Anonymous Credentials (KVAC) schemes.

13. [SyRA](./syra). Implements sybil resilient signatures to be used for generating pseudonyms for low-entropy credential attributes.

14. [Verifiable encryption](./verifiable_encryption) using the paper [Verifiable Encryption from MPC-in-the-Head](https://eprint.iacr.org/2021/1704.pdf).



## Composite proof system



The [proof system](./proof_system) that uses above-mentioned primitives. 



## Build



`cargo build` or `cargo build --release`



By default, it uses standard library and [rayon](https://github.com/rayon-rs/rayon) for parallelization



To build with standard library but without parallelization, use `cargo build --no-default-features --features=std`



For `no_std` support, build as `cargo build --no-default-features --features=wasmer-sys`



For WASM, build as `cargo build --no-default-features --features=wasmer-js --target wasm32-unknown-unknown`



## Test



`cargo test`



The above maybe slower as it runs the tests in debug mode and some tests work on large inputs. 

For running tests faster, run `cargo test --release`



## Benchmarking



[Criterion](https://github.com/bheisler/criterion.rs) benchmarks [here](./benches)



Some tests also print time consumed by the operations, run `cargo test --release -- --nocapture [test name]`



## WASM wrapper



A WASM wrapper has been created over this repo [here](https://github.com/docknetwork/crypto-wasm). The wrapper is then used to create [this Typescript library](https://github.com/docknetwork/crypto-wasm-ts) which is more ergonomic than using the wrapper as the wrapper contains free floating functions.