#hashing #hash #message-authentication #sha-3 #algorithm #cryptography #sha-3-256


rs_sha3_256 is a Rust implementation of the SHA3-256 cryptographic hash algorithm, part of the larger rs_shield project. This package provides SHA3-256 hashing functionality in a standalone manner, ideal for when only SHA3-256 is required. Alternatively, for those seeking a comprehensive set of cryptographic functions, this same algorithm is included within the broader rs_shield library bundle. The focus of rs_sha3_256 and the larger project is on performance, safety, and openness, with a commitment to ongoing maintenance and enhancement.

3 releases

0.1.2 Jun 12, 2023
0.1.1 Jun 4, 2023
0.1.0 May 30, 2023

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rs_sha3_256 is a Rust crate implementing the SHA-3_256 cryptographic hash algorithm. This permutation-based hash algorithm is designed for compatibility with Rust's libcore in a #![no_std] context, allowing it to operate as a standalone crate for specialized use cases and also function within a #![no_std], #![no_alloc] environment, rendering it suitable for systems where dynamic memory allocation is not feasible.

This implementation of SHA-3_256 is compliant with the Federal Information Processing Standards (FIPS) Publication 202[^1]. As per the National Institute of Standards and Technology (NIST) guidelines, SHA-3_256 is recommended for several use cases:

"SHA-3 provides security strengths against preimage, second preimage and collision attacks [...] at the 128-bit security level."

Given this advice, NIST recommendations imply that SHA-3_256 is suitable for the following contexts:

  • Digital signatures that require 128 bits of security.
  • Cryptographic hash functions in systems and protocols requiring 128 bits of security.
  • Authentication methods that necessitate 128 bits of security.

Beyond these specific recommendations, SHA-3_256 could also find application in:

  • Data integrity checks in Merkle Trees[^4].
  • Version control systems for the generation of commit identifiers[^2].
  • Hash-based message authentication codes (HMACs), when collision resistance is necessary[^3].
  • As a randomized hash function in Bloom filters[^5].
  • Key derivation functions or in generation of random numbers[^6].

These points should be carefully considered, given your overall security objectives and risk tolerance.

For access to a comprehensive range of cryptographic functions, rs_sha3_256 can be utilized as part of the rs_shield library bundle.

How To Use

Below are steps to use the rs_sha3_256 crate in your Rust projects:

  1. Add the following line to your Cargo.toml under the [dependencies] section:

    rs_sha3_256 = "0.1.*"
  2. Use the functions provided by the rs_sha3_256 module in your code. Here's an example of how to create a SHA-3_256 hash from a string:

    use rs_sha3_256::{HasherContext, Sha3_256Hasher};
    let mut sha3_256hasher = Sha3_256Hasher::default();
    sha3_256hasher.write(b"your string here");
    let u64result = sha3_256hasher.finish();
    let bytes_result = HasherContext::finish(&mut sha3_256hasher);
    assert_eq!(u64result, 0x4722CA201B0E3369);
    assert_eq!(format!("{bytes_result:02x}"), "4722ca201b0e33697597ff6abd97e83b73c4ebd2f680b3ac23616e96dc351648");
    assert_eq!(format!("{bytes_result:02X}"), "4722CA201B0E33697597FF6ABD97E83B73C4EBD2F680B3AC23616E96DC351648");
            0x47, 0x22, 0xCA, 0x20, 0x1B, 0x0E, 0x33, 0x69, 0x75, 0x97, 0xFF, 0x6A, 0xBD, 0x97, 0xE8, 0x3B, 0x73, 0xC4,
            0xEB, 0xD2, 0xF6, 0x80, 0xB3, 0xAC, 0x23, 0x61, 0x6E, 0x96, 0xDC, 0x35, 0x16, 0x48

More Information

For a more detailed exploration of rs_sha3_256, an overview of other available cryptographic functions, and an introduction to the broader rs_shield project, please consult the RustyShield project page on crates.io.


Potential contributors are encouraged to consult the contribution guidelines on our GitHub page.


This project is licensed under GPL-2.0-only.


[^1]: National Institute of Standards and Technology. (2015). SHA-3 Standard: Permutation-Based Hash and Extendable-Output Functions. FIPS PUB 202 [^2]: Linus Torvalds. (2005). Git: A distributed version control system. Software: Practice and Experience, 41(1), 79-88. DOI:10.1002/spe.1006 [^3]: Krawczyk, H., Bellare, M., & Canetti, R. (1997). HMAC: Keyed-Hashing for Message Authentication. RFC 2104 [^4]: Merkle, R. C. (1988). A Digital Signature Based on a Conventional Encryption Function. Link [^5]: Bloom, B. H. (1970). Space/time trade-offs in hash coding with allowable errors. Communications of the ACM, 13(7), 422-426. DOI:10.1145/362686.362692 [^6]: National Institute of Standards and Technology. (2012). Recommendation for Key Derivation Using Pseudorandom Functions. NIST Special Publication 800-108

Note: The references have been provided as per the best knowledge as of May 17, 2023.