Constant-time comparison of equal-length byte strings to prevent timing attacks; faithful line-by-line transliteration of upstream implementation, includes provenance headers, tests, and CI.
This is a Kotlin Multiplatform line-by-line transliteration port of cesarb/constant_time_eq.
Original Project: This port is based on cesarb/constant_time_eq. All design credit and project intent belong to the upstream authors; this repository is a faithful port to Kotlin Multiplatform with no behavioural changes intended.
This is an in-progress port. The goal is feature parity with the upstream Rust crate while providing a native Kotlin Multiplatform API. Every Kotlin file carries a // port-lint: source <path> header naming its upstream Rust counterpart so the AST-distance tool can track provenance.
cesarb/constant_time_eqThe text below is reproduced and lightly edited from
https://github.com/cesarb/constant_time_eq. It is the upstream project's own description and remains under the upstream authors' authorship; links have been rewritten to absolute upstream URLs so they continue to resolve from this repository.
Compares two equal-sized byte strings in constant time.
Inspired by the Linux kernel's crypto_memneq.
Licensed under either of
at your option.
dependencies {
implementation("io.github.kotlinmania:constant-time-eq-kotlin:0.1.1")
}
./gradlew build
./gradlew test
./gradlew swiftExportTest
See AGENTS.md and CLAUDE.md for translator discipline, port-lint header convention, and Rust → Kotlin idiom mapping.
Keep the upstream Rust checkout in tmp/constant_time_eq/ (gitignored) as the translation ground truth.
This Kotlin port is distributed under the same CC0-1.0 license as the upstream cesarb/constant_time_eq. See LICENSE (and any sibling LICENSE-* / NOTICE files mirrored from upstream) for the full text.
Original work copyrighted by the constant_time_eq authors.
Kotlin port: Copyright (c) 2026 Sydney Renee and The Solace Project.
Thanks to the cesarb/constant_time_eq maintainers and contributors for the original Rust implementation. This port reproduces their work in Kotlin Multiplatform; bug reports about upstream design or behavior should go to the upstream repository.
Surfaced from shared tags and platforms — no rankings paid for.