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What is temp-fork-ahash?

kornelski/temp-fork-ahash — explained in plain English

Analysis updated 2026-07-18 · repo last pushed 2024-02-11

Audience · developerComplexity · 2/5DormantSetup · easy

In one sentence

AHash is a drop-in replacement for Rust's default hashmap hasher that makes in-memory data lookups much faster while protecting against collision attacks. It is for temporary, in-memory use only, not for saving or sending hashed values.

Mindmap

mindmap
  root((repo))
    What it does
      Faster hashmap hashing
      Drop-in replacement
      Keyed hash system
    Key features
      Very fast
      Attack resistant
      Non-standard output
    Use cases
      High-traffic web servers
      Data-heavy apps
      In-memory lookups
    Audience
      Rust developers
      Performance-focused
    Limitations
      Not for passwords
      Not for checksums
      In-memory only

Code map

Detail Auto

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filefunction / class

What do people build with it?

USE CASE 1

Speed up in-memory hashmap lookups in a high-traffic Rust web server.

USE CASE 2

Protect a data-heavy Rust application from collision-based denial-of-service attacks.

USE CASE 3

Replace Rust's default hasher with minimal code changes to boost lookup performance.

What is it built with?

Rust

How does it compare?

kornelski/temp-fork-ahash0verflowme/alarm-clock0xhassaan/nn-from-scratch
Stars0
LanguageCSSPython
Last pushed2024-02-112022-10-03
MaintenanceDormantDormant
Setup difficultyeasyeasymoderate
Complexity2/52/54/5
Audiencedevelopervibe coderdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min

Add it as a dependency in your Rust project's Cargo.toml and swap the hasher type in your HashMap declaration.

The explanation does not specify the license, so the terms of use are unknown.

So what is it?

AHash is a tool for programmers using the Rust language to make in-memory hashmaps, the data structures software uses to look up information by a key, like a dictionary, run much faster. It's designed as a drop-in replacement for the default hashing mechanism, meaning developers can swap it in with almost no code changes and get a noticeable speed boost. At a high level, a hashmap works by taking a key (like a word) and running it through a math function that spits out a number, which determines where the value lives in the computer's memory. AHash's approach has two key traits: it's extremely fast, and it uses a "keyed" system, meaning each map generates completely different hash values that can't be predicted without knowing the internal keys. This prevents a specific type of attack where bad actors flood a system with items designed to collide, intentionally slowing things down. This tool is meant for Rust developers building performance-sensitive applications who need fast, in-memory data lookups. For example, a developer building a high-traffic web server or a data-heavy application would use it to keep their software responsive. The project explicitly states it is not a cryptographically secure hash, so it shouldn't be used for passwords or security checksums. There's a notable tradeoff: AHash doesn't have a fixed standard for its output. This allows the algorithm to be updated and improved over time as faster techniques are discovered, but it means the same input will produce different hashes on different computers or software versions. Because of this, the project is explicitly designed for temporary, in-memory use, not for saving hashed values to disk or sending them over a network.

Copy-paste prompts

Prompt 1
Show me how to use AHash as a drop-in replacement for the default hasher in a Rust HashMap, including the Cargo.toml dependency and a basic code example.
Prompt 2
Explain why AHash is not suitable for saving hashes to disk or sending them over a network, and show me what happens to the hash output across different machines.
Prompt 3
Help me benchmark AHash against Rust's default SipHash hasher for a high-traffic web server scenario with millions of in-memory key lookups.
Prompt 4
Walk me through how AHash's keyed system prevents collision attacks where bad actors flood a hashmap with keys that hash to the same value.

Frequently asked questions

What is temp-fork-ahash?

AHash is a drop-in replacement for Rust's default hashmap hasher that makes in-memory data lookups much faster while protecting against collision attacks. It is for temporary, in-memory use only, not for saving or sending hashed values.

Is temp-fork-ahash actively maintained?

Dormant — no commits in 2+ years (last push 2024-02-11).

What license does temp-fork-ahash use?

The explanation does not specify the license, so the terms of use are unknown.

How hard is temp-fork-ahash to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is temp-fork-ahash for?

Mainly developer.

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