cloudflare/circl

cloudflare/circl

Description: CIRCL: Cloudflare Interoperable Reusable Cryptographic Library

Language: Go

License: NOASSERTION

Stars: 1675

Forks: 205

Open issues: 62

Created: 2018-09-08T19:20:52Z

Pushed: 2026-06-10T23:14:11Z

Default branch: main

Fork: no

Archived: no

README:

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. All security issues must be reported, please notify us immediately following the instructions given in our Security Policy.

Installation

You can get CIRCL by fetching:

go get -u github.com/cloudflare/circl

Alternatively, look at the Cloudflare Go fork to see how to integrate CIRCL natively in Go.

List of Algorithms

[RFC-7748]: https://doi.org/10.17487/RFC7748 [RFC-8032]: https://doi.org/10.17487/RFC8032 [RFC-8235]: https://doi.org/10.17487/RFC8235 [RFC-9180]: https://doi.org/10.17487/RFC9180 [RFC-9380]: https://doi.org/10.17487/RFC9380 [RFC-9474]: https://doi.org/10.17487/RFC9474 [RFC-9496]: https://doi.org/10.17487/RFC9496 [RFC-9497]: https://doi.org/10.17487/RFC9497 [FIPS 202]: https://doi.org/10.6028/NIST.FIPS.202 [FIPS 204]: https://doi.org/10.6028/NIST.FIPS.204 [FIPS 205]: https://doi.org/10.6028/NIST.FIPS.205 [FIPS 186-5]: https://doi.org/10.6028/NIST.FIPS.186-5 [BLS12-381]: https://electriccoin.co/blog/new-snark-curve/ [ia.cr/2015/267]: https://ia.cr/2015/267 [ia.cr/2019/966]: https://ia.cr/2019/966

Elliptic Curve Cryptography

| Diffie-Hellman Protocol | |:---:|

• [X25519](./dh/x25519) and [X448](./dh/x448) functions. ([RFC-7748])
• [Curve4Q](./dh/curve4q) function based on FourQ curve. (draft-ladd-cfrg-4q)

| Digital Signature Schemes | |:---:|

• [Ed25519](./sign/ed25519) and [Ed448](./sign/ed448) signatures. ([RFC-8032])
• [BLS](./sign/bls) signatures. (draft-irtf-cfrg-bls-signature)

| Prime Groups | |:---:|

• [P-256, P-384, P-521](./group). ([FIPS 186-5])
• [Ristretto](./group) group. ([RFC-9496])
• [Bilinear pairings](./ecc/bls12381): with the [BLS12-381] curve, and hash to G1 and G2.
• [Hash to curve](./group), hash to field, XMD and XOF [expanders](./expander). ([RFC-9380])

| High-Level Protocols | |:---:|

• [HPKE](./hpke): Hybrid Public-Key Encryption ([RFC-9180])
• [VOPRF](./oprf): Verifiable Oblivious Pseudorandom functions. ([RFC-9497])
• [RSA Blind Signatures](./blindsign/blindrsa). ([RFC-9474])
• [Partially-blind](./blindsign/blindrsa/partiallyblindrsa/) RSA Signatures. (draft-cfrg-partially-blind-rsa)
• [CPABE](./abe/cpabe): Ciphertext-Policy Attribute-Based Encryption. ([ia.cr/2019/966])
• [OT](./ot/simot): Simplest Oblivious Transfer ([ia.cr/2015/267]).
• [Threshold RSA](./tss/rsa) Signatures (Shoup Eurocrypt 2000).
• [Prio3](./vdaf/prio3) Verifiable Distributed Aggregation Function (draft-irtf-cfrg-vdaf).

Post-Quantum Cryptography

| KEM: Key Encapsulation Methods | |:---:|

• [ML-KEM](./kem/mlkem): modes 512, 768, 1024 (FIPS-203).
• [X-Wing](./kem/xwing) (draft-connolly-cfrg-xwing-kem).
• [Kyber KEM](./kem/kyber): modes 512, 768, 1024 (KYBER).
• [FrodoKEM](./kem/frodo): modes 640-SHAKE. (FrodoKEM)
• [CSIDH](./dh/csidh): Post-Quantum Commutative Group Action (CSIDH).
• (insecure, deprecated) ~~[SIDH/SIKE](./kem/sike)~~: Supersingular Key Encapsulation with primes p434, p503, p751 (SIKE).

| Digital Signature Schemes | |:---:|

• [Dilithium](./sign/dilithium): modes 2, 3, 5 (Dilithium).
• [ML-DSA](./sign/mldsa): modes 44, 65, 87 ([FIPS 204]).
• [SLH-DSA](./sign/slhdsa): twelve parameter sets, pure and pre-hash signing ([FIPS 205]).

Zero-knowledge Proofs

• [Schnorr](./zk/dl): Prove knowledge of the Discrete Logarithm. ([RFC-8235])
• [DLEQ](./zk/dleq): Prove knowledge of the Discrete Logarithm Equality. ([RFC-9497])
• [DLEQ in Qn](./zk/qndleq): Prove knowledge of the Discrete Logarithm Equality for subgroup of squares in (Z/nZ)\*.

Symmetric Cryptography

| XOF: eXtendable Output Functions | |:---:|

• [SHAKE128 and SHAKE256](./xof) ([FIPS 202]).
• [BLAKE2X](./xof): BLAKE2XB and BLAKE2XS (Blake2x)
• [KangarooTwelve](./xof/k12): fast hashing based on Keccak-p. (KangarooTwelve).
• SIMD Keccak f1600 Permutation.

| LWC: Lightweight Cryptography | |:---:|

• [Ascon v1.2](./cipher/ascon): Family of AEAD block ciphers (ASCON)

Misc

| Integers | |:---:|

• Safe primes generation.
• Integer encoding: wNAF, regular signed digit, mLSBSet representations.

| Finite Fields | |:---:|

• Fp25519, Fp448, Fp511, Fp434, Fp503, Fp751.
• Fp381, and its quadratic, sextic and twelveth extensions.
• Polynomials in monomial and Lagrange basis.

| Elliptic Curves | |:---:|

• P-384 Curve

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