This is a Kotlin Multiplatform line-by-line transliteration port of RustCrypto/utils.

Original Project: This port is based on RustCrypto/utils. 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.

The text below is reproduced and lightly edited from https://github.com/RustCrypto/utils. 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.

This repository contains various utility crates used in the RustCrypto project.

Name	crates.io	Docs	Description
aarch64-dit			Wrappers for enabling/disabling the Data Independent Timing (DIT) feature on AArch64 CPUs
blobby			Decoder of the simple de-duplicated binary blob storage format
block-buffer			Fixed size buffer for block processing of data
block‑padding			Padding and unpadding of messages divided into blocks
cmov			Conditional move intrinsics
cpubits			Compile-time detection heuristics for the optimal word size to use for the target CPU
cpufeatures			Lightweight and efficient alternative to the is_x86_feature_detected! macro
ctutils			Constant-time utility library with selection and equality testing support targeting cryptographic applications
dbl			Double operation in Galois Field (GF)
digest-io			std::io-compatibility wrappers for traits defined in the digest crate
hex-literal			A macro for converting hexadecimal strings to a byte array at compile time
inout			Custom reference types for code generic over in-place and buffer-to-buffer modes of operation.
wycheproof2blb
zeroize			Securely zero memory while avoiding compiler optimizations

All crates licensed under either of

• Apache License, Version 2.0
• MIT license

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

dependencies {
    implementation("io.github.kotlinmania:zeroize-kotlin:0.1.0")
}

./gradlew build
./gradlew test

• macOS arm64
• Linux x64
• Windows mingw-x64
• iOS arm64 / simulator-arm64 (Swift export + XCFramework)
• JS (browser + Node.js)
• Wasm-JS (browser + Node.js)
• Wasm-WASI (Node.js)
• Android (API 24+)
• Android Native arm32 / arm64 / x86 / x64
• JVM

See AGENTS.md for translator discipline, port-lint header convention, and Rust -> Kotlin idiom mapping.

This Kotlin port is distributed under the same Apache-2.0 license as the upstream RustCrypto/utils. See LICENSE (and any sibling LICENSE-* / NOTICE files mirrored from upstream) for the full text.

Original work copyrighted by the utils authors.
Kotlin port: Copyright (c) 2026 Sydney Renee and The Solace Project.

Thanks to the RustCrypto/utils 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.