58 lines
1.7 KiB
Markdown
58 lines
1.7 KiB
Markdown
# c-kzg - work in progress
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The very beginnings of a simple implementation of [KZG commitments](https://dankradfeist.de/ethereum/2020/06/16/kate-polynomial-commitments.html) in C, using the [Blst library](https://github.com/supranational/blst) from Supranational for field and curve operations.
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Initially, at least, this largely follows the [go-kzg](https://github.com/protolambda/go-kzg) implementation.
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Done so far:
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- FFT and inverse FFT over the finite field.
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- FFTs over the G1 group
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- Single polynomial commitment and verification
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## Installation
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Build the [Blst library](https://github.com/supranational/blst) following the instructions there. Then,
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1. Copy the resulting `libblst.a` file into the `lib/` directory here.
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2. From Blst's `bindings/` directory copy `blst.h` and `blst_aux.h` to `inc/`
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That is,
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```
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cp ../blst/libblast.a lib/
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cp ../blst/bindings/*.h inc/
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```
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## Build
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Build the `libckzg.a` library:
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```
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cd src
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make lib
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```
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Build a debug version that aborts on error conditions and attempts to print some helpful info (file, line number, condition that failed):
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```
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cd src
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make debuglib
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```
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## Run tests
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```
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cd src
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make test
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```
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Unit tests for an individual file can be built and run with `make fft_fr_test` for example. Once a test runner such as *fft_fr_test* has been built, individual unit tests can be run with `./fft_fr_test <test-name>`.
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Thanks to [Acutest](https://github.com/mity/acutest) for the unit test harness, which is used here under the MIT licence.
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## Prerequisites
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- Blst library (see above)
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- `clang` compiler. I'm using Clang 10.0.0. I'll likely add `gcc` options in future.
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- I'm developing on Ubuntu 20.04. Will check portability later.
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