Life & fun · February 19, 2026
Fast and lightweight hash implementations (xdigest)
I was working on optimising Subversion. One of its bottleneck is computing file hashes. First thing I tried was to use OpenSSL for that. It significantly improved its performance. It made it 8x faster in some cases. However, it was not optimal to use it: - OpenSSL is heavy and bloated. It's like a whole operating system on its own. - Since OpenSSL 3.0, low-level digest APIs are deprecated, and instead they recommend to use EVP which might be slow in some cases. So I decided to create a new library for computing cryptographic digests. It basically takes OpenSSL's implementations, but with an…
What it does
In the maker’s words, at launch
I was working on optimising Subversion. One of its bottleneck is computing file hashes. First thing I tried was to use OpenSSL for that. It significantly improved its performance. It made it 8x faster in some cases. However, it was not optimal to use it: - OpenSSL is heavy and bloated. It's like a whole operating system on its own. - Since OpenSSL 3.0, low-level digest APIs are deprecated, and instead they recommend to use EVP which might be slow in some cases. So I decided to create a new library for computing cryptographic digests. It basically takes OpenSSL's implementations, but with an aim to provide simple and lightweight access to popular hash algorithms with a focus on performance.
Does the same job
all alternatives →- DFDiscohash – Fast Hash2020 · github.com · ▲75
- TBThe BLAKE3 hash function running on a 6502 microprocessor2022 · github.com · ▲91
- FAfcp – A significantly faster alternative to cp(1), written in Rust2021 · github.com · ▲88
- GVGo version of HighwayHash with optimized assembly implementations2018 · github.com · ▲48
- HAHash Archive helps you verify the hashes of insecure downloads2016 · hash-archive.org · ▲52
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