extras: Add EC toolbox abstractions and OPRF(P-384, SHA-384) VOPRF API - Githubissues

apple / swift-crypto

Open-source implementation of a substantial portion of the API of Apple CryptoKit suitable for use on Linux platforms.

https://apple.github.io/swift-crypto

Apache License 2.0

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extras: Add EC toolbox abstractions and OPRF(P-384, SHA-384) VOPRF API #292

Closed simonjbeaumont closed 1 week ago

simonjbeaumont commented 3 weeks ago

Motivation

We would like to provide support for the P384-SHA384 Verifiable Oblivious Pseudorandom Function (VOPRF) as defined in RFC 9497: VOPRF Protocol.

Modifications

Add protocols for some "ECToolbox" abstractions: Group, GroupElement, GroupScalar, HashToGroup.
Add implementations backed by BoringSSL.
Duplicate some utilities from Crypto into _CryptoExtras: hexadecimal bytes and I2OSP.
Add VOPRF API, rooted at enum P384._VOPRF.

Results

New internal abstractions that make it easier to bring up new implementations.
New API for OPRF(P-384, SHA-384) in VOPRF mode.

Tests

Test vectors for internal HashToField implementation.
Test vectors for internal VOPRF implementation.
Tests of the VOPRF public API.

simonjbeaumont commented 3 weeks ago

@Lukasa PTAL when you have time 🙏

simonjbeaumont commented 1 week ago

Thanks @Lukasa :) please merge when convenient.