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C-KZG-4844: A minimal library for EIP-4844 Polynomial Commitments

This is a copy of C-KZG stripped down to support the Polynomial Commitments API:

  • bytes_to_bls_field
  • vector_lincomb
  • g1_lincomb
  • blob_to_kzg_commitment
  • verify_kzg_proof
  • compute_kzg_proof
  • evaluate_polynomial_in_evaluation_form

and compute_powers from the Validator API.

We also provide load_trusted_setup and free_trusted_setup to load the trusted setup data from a file into an object that can be passed to the API functions.

The only dependency is blst. Ensure blst.h is provided at ../inc and libblst.a at ../lib. (blst.h includes blst_aux.h, but the latter is unused and can be empty.)