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Standard Ciphersuites for Cryptographic Protocols

Cryptographic protocols are often parameterized by ciphersuites and share common functions for data serialization, message expansion, and domain separation. A ciphersuite may also specify algebraic structures used by the protocol, and these structures need to expose a common interface to the protocol.

This repository contains the code for the following npm packages:

@privacyresearch/ciphersuite-shared - A collection of tools and interfaces develpers can use to author ciphersuites that will operate with protocol implementations that consume these interfaces, such as this implementation of the Internet-Draft VOPRF protocol.
@privacyresearch/generic-ciphersuite-r255s256 - An implementation of the OPRF(Ristretto255, SHA256) ciphersuite using a generic curve implementation that allows developers to provide their own implementation of arbitrary precision arithmetic (e.g. JSBI).
@privacyresearch/noble-ciphersuite-r255s256 - An implementation of the OPRF(Ristretto255, SHA256) ciphersuite using the native bigint-based noble-ed25519 implementation of the Edwards25519 curve.

This library is a work in progress, exposing ciphersuites dependent on a prime-order group (in practice often from an elliptic curve) and a hash function. The interfaces and functions come directly from this Internet-Draft OPRF protocol and are used in an implementation of this specification. Thus, at this point in development, the interfaces and function collections will be incomplete. As we implement more protocols using external ciphersuites developed with this library, we will expand the capabilities of the library and improve the abstractions.

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Standard Ciphersuites for Cryptographic Protocols

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