cloudflare / Circl
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CIRCL: Cloudflare Interoperable Reusable Cryptographic Library
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CIRCL
CIRCL (Cloudflare Interoperable, Reusable Cryptographic Library) is a collection of cryptographic primitives written in Go. The goal of this library is to be used as a tool for experimental deployment of cryptographic algorithms targeting Post-Quantum (PQ) and Elliptic Curve Cryptography (ECC).
Security Disclaimer
🚨 This library is offered as-is, and without a guarantee. Therefore, it is expected that changes in the code, repository, and API occur in the future. We recommend to take caution before using this library in a production application since part of its content is experimental.
Installation
You can get it by typing:
go get -u github.com/cloudflare/circl
Versioning
Version numbers are Semvers. We release a minor version for new functionality, a major version for breaking API changes, and increment the patchlevel for bugfixes.
Implemented Primitives
| Category | Algorithms | Description | Applications |
|---|---|---|---|
| PQ Key Exchange | SIDH | SIDH provide key exchange mechanisms using ephemeral keys. | Post-quantum key exchange in TLS |
| PQ Key Exchange | cSIDH | Isogeny based drop-in replacement for Diffie–Hellman | Post-Quantum Key exchange. |
| PQ KEM | SIKE | SIKE is a key encapsulation mechanism (KEM). | Post-quantum key exchange in TLS |
| Key Exchange | X25519, X448 | RFC-7748 provides new key exchange mechanisms based on Montgomery elliptic curves. | TLS 1.3. Secure Shell. |
| Key Exchange | FourQ | One of the fastest elliptic curves at 128-bit security level. | Experimental for key agreement and digital signatures. |
| Key Exchange / Digital signatures | P-384 | Our optimizations reduce the burden when moving from P-256 to P-384. | ECDSA and ECDH using Suite B at top secret level. |
| Digital Signatures | Ed25519, Ed448 | RFC-8032 provides new signature schemes based on Edwards curves. | Digital certificates and authentication. |
| Key Encapsulation | P-256, P-384, P-521, X25519 and X448 | Key encapsulation methods based on Diffie-Hellman. | HPKE |
| Hybrid Public-Key Encryption | Base, Auth, PSK, AuthPSK | HPKE is a combination of KEM and AEAD. | TLS |
| PQ KEM/PKE | Kyber | Lattice (M-LWE) based IND-CCA2 secure key encapsulation mechanism and IND-CPA secure public key encryption | Post-Quantum Key exchange |
| PQ Digital Signatures | Dilithium, Hybrid modes | Lattice (Module LWE) based signature scheme | Post-Quantum PKI |
Work in Progress
| Category | Algorithms | Description | Applications |
|---|---|---|---|
| Hashing to Elliptic Curve Groups | Several algorithms: Elligator2, Ristretto, SWU, Icart. | Protocols based on elliptic curves require hash functions that map bit strings to points on an elliptic curve. | VOPRF. OPAQUE. PAKE. Verifiable random functions. |
| Bilinear Pairings | Plans for moving BN256 to stronger pairing curves. | A bilineal pairing is a mathematical operation that enables the implementation of advanced cryptographic protocols, such as identity-based encryption (IBE), short digital signatures (BLS), and attribute-based encryption (ABE). | Geo Key Manager, Randomness Beacon, Ethereum and other blockchain applications. |
| PQ KEM | HRSS-SXY | Lattice (NTRU) based key encapsulation mechanism. | Key exchange for low-latency environments |
| PQ Digital Signatures | SPHINCS+ | Stateless hash-based signature scheme | Post-Quantum PKI |
Testing and Benchmarking
Library comes with number of make targets which can be used for testing and benchmarking:
-
testperforms testing of the binary. -
benchruns benchmarks. -
coverproduces coverage. -
lintruns set of linters on the code base.
Contributing
To contribute, fork this repository and make your changes, and then make a Pull Request. A Pull Request requires approval of the admin team and a successful CI build.
How to Cite
To cite CIRCL, use one of the following formats and update with the date you accessed this project.
APA Style
Faz-Hernández, A. and Kwiatkowski, K. (2019). Introducing CIRCL:
An Advanced Cryptographic Library. Cloudflare. Available at
https://github.com/cloudflare/circl. Accessed Feb 2021.
Bibtex Source
@manual{circl,
title = {Introducing CIRCL: An Advanced Cryptographic Library},
author = {Armando Faz-Hern\'{a}ndez and Kris Kwiatkowski},
organization = {Cloudflare},
abstract = {{CIRCL (Cloudflare Interoperable, Reusable Cryptographic Library) is
a collection of cryptographic primitives written in Go. The goal
of this library is to be used as a tool for experimental
deployment of cryptographic algorithms targeting Post-Quantum (PQ)
and Elliptic Curve Cryptography (ECC).}},
note = {Available at \url{https://github.com/cloudflare/circl}. Accessed Feb 2021},
month = jun,
year = {2019}
}
License
The project is licensed under the BSD-3-Clause License.
Note that the project description data, including the texts, logos, images, and/or trademarks,
for each open source project belongs to its rightful owner.
If you wish to add or remove any projects, please contact us at [email protected].