Updated Readme with information about c-kzg-4844 drop-in replacement

readme.md

@@ -4,64 +4,31 @@ The goal is to create a parallelized KZG library for Ethereum Data Sharding (aka
 
 # Backend ECC libraries
 
-Support for multiple backend ECC libraries is implemented via [Traits](https://github.com/sifraitech/kzg/blob/main/kzg/src/lib.rs). Such an approach allows to easily change backend ECC libraries in a way that is done in [benchmarks](https://github.com/sifraitech/kzg/tree/main/kzg-bench/src/benches) and [tests](https://github.com/sifraitech/kzg/tree/main/kzg-bench/src/tests). List of different backend ECC libraries:
+Support for multiple backend ECC libraries is implemented via [Traits](https://github.com/sifraitech/kzg/blob/main/kzg/src/lib.rs). Such an approach allows to easy change backend ECC libraries as all the crates shared the same interface (see [benchmarks](https://github.com/sifraitech/kzg/tree/main/kzg-bench/src/benches) and [tests](https://github.com/sifraitech/kzg/tree/main/kzg-bench/src/tests)). The current state of supported backend ECC libraries:
 
-* Arkworks - Rust implementation using [akrworks](https://github.com/arkworks-rs);
-* blst-from-scratch - Rust implementation using [blst](https://github.com/supranational/blst);
-* ckzg - bindings for [c-kzg](https://github.com/benjaminion/c-kzg) that uses [blst](https://github.com/supranational/blst);
-* mcl - Rust implementation using [mcl](https://github.com/herumi/mcl);
-* zkcrypto - Rust implementation using [zkcrypto](https://github.com/zkcrypto).
+| Backend ECC | FFT/DAS | EIP-4844 (non-parallel) | EIP-4844 (parallel) | [c-kzg-4844](https://github.com/ethereum/c-kzg-4844) drop-in replacement |
+| :---: | :---: | :---: | :---: | :---: |
+| [blst](https://github.com/supranational/blst) | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |
+| [mcl](https://github.com/herumi/mcl) | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: | :white_check_mark: |
+| [arkworks](https://github.com/arkworks-rs/algebra) | :heavy_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
+| [zkcrypto](https://github.com/zkcrypto/bls12_381) | :heavy_check_mark: | :white_check_mark: | :white_check_mark: | :white_check_mark: |
+
+# Drop-in replacement for c-kzg-4844
+
+We aim to expose [an identical C interface](https://github.com/sifraitech/rust-kzg/blob/b4de1923a6218ea37021d0f9e3bd375dbf529d34/blst-from-scratch/src/eip_4844.rs#L604:L835) compared to [c-kzg-4844](https://github.com/ethereum/c-kzg-4844) so that `rust-kzg` could work as a drop-in replacement for c-kzg-4844. If you already use [c-kzg-4844 bindings](https://github.com/ethereum/c-kzg-4844/tree/main/bindings) you can try faster paralellized `rust-kzg` without any changes to your code-base by simply replacing the binary. Instructions for C#, Java, Nodejs, Python, Rust bindings are available [here](https://github.com/sifraitech/rust-kzg/blob/main/blst-from-scratch/run-c-kzg-4844-tests.sh)
 
 # Example
 
 The best place to look for examples is [tests](https://github.com/sifraitech/kzg/tree/main/kzg-bench/src/tests) directory.
 
+Currently, the ECC backend is set by pointing Cargo to the corresponding crate:
+
 ```
 [dependencies]
 kzg = { git = "https://github.com/sifraitech/kzg.git", package = "blst_from_scratch" }
 kzg_traits = { git = "https://github.com/sifraitech/kzg.git", package = "kzg" }
 ```
 
-```
-use kzg::eip_4844::{bytes_to_bls_field, compute_powers};
-use kzg_traits::*;
-
-const EXPECTED_POWERS: [[u64; 4usize]; 11] = [
-    [1, 0, 0, 0],
-    [32930439, 0, 0, 0],
-    [1084413812732721, 0, 0, 0],
-    [15773128324309817559, 1935, 0, 0],
-    [17639716667354648417, 63748557064, 0, 0],
-    [14688837229838358055, 2099267969765560859, 0, 0],
-    [17806839894568993937, 15217493595388594120, 3747534, 0],
-    [17407663719861420663, 10645919139951883969, 123407966953127, 0],
-    [9882663619548185281, 9079722283539367550, 5594831647882181930, 220],
-    [4160126872399834567, 5941227867469556516, 11658769961926678707, 7254684264],
-    [4000187329613806065, 4317886535621327299, 17988956659770583631, 238899937640724696]
-];
-
-fn main() {
-    let x: u64 = 32930439;
-    let n = 11;
-
-    let x_bytes: [u8; 32] = u64_to_bytes(x);
-
-    let x_bls = bytes_to_bls_field(&x_bytes);
-
-    let powers = compute_powers(&x_bls, n);
-
-    for (p, expected_p) in powers.iter().zip(EXPECTED_POWERS.iter()) {
-        assert_eq!(expected_p, &p.to_u64_arr());
-    }
-}
-
-fn u64_to_bytes(x: u64) -> [u8; 32] {
-    let mut bytes = [0u8; 32];
-    bytes[0..8].copy_from_slice(&x.to_le_bytes());
-    bytes
-}
-```
-
 # Benchmarks
 
 The latest benchmarks on AMD 3900X: