117 lines
4.3 KiB
C
117 lines
4.3 KiB
C
/*
|
|
* Copyright 2021 Benjamin Edgington
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* @file c_kzg_4844.h
|
|
*
|
|
* Minimal interface required for EIP-4844.
|
|
*/
|
|
|
|
#ifndef C_KZG_4844_H
|
|
#define C_KZG_4844_H
|
|
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
|
|
#include "blst.h"
|
|
|
|
typedef blst_p1 g1_t; /**< Internal G1 group element type */
|
|
typedef blst_p2 g2_t; /**< Internal G2 group element type */
|
|
typedef blst_fr fr_t; /**< Internal Fr field element type */
|
|
typedef blst_scalar scalar_t; /**< Internal scalar type */
|
|
|
|
typedef g1_t KZGCommitment;
|
|
typedef g1_t KZGProof;
|
|
typedef fr_t BLSFieldElement;
|
|
|
|
/**
|
|
* The common return type for all routines in which something can go wrong.
|
|
*
|
|
* @warning In the case of @p C_KZG_OK or @p C_KZG_BADARGS, the caller can assume that all memory allocated by the
|
|
* called routines has been deallocated. However, in the case of @p C_KZG_ERROR or @p C_KZG_MALLOC being returned, these
|
|
* are unrecoverable and memory may have been leaked.
|
|
*
|
|
* @todo Check that memory is not leaked anywhere in the case of C_KZG_BADARGS.
|
|
*/
|
|
typedef enum {
|
|
C_KZG_OK = 0, /**< Success! */
|
|
C_KZG_BADARGS, /**< The supplied data is invalid in some way */
|
|
C_KZG_ERROR, /**< Internal error - this should never occur and may indicate a bug in the library */
|
|
C_KZG_MALLOC, /**< Could not allocate memory */
|
|
} C_KZG_RET;
|
|
|
|
|
|
/**
|
|
* Stores the setup and parameters needed for performing FFTs.
|
|
*/
|
|
typedef struct {
|
|
uint64_t max_width; /**< The maximum size of FFT these settings support, a power of 2. */
|
|
fr_t *expanded_roots_of_unity; /**< Ascending powers of the root of unity, size `width + 1`. */
|
|
fr_t *reverse_roots_of_unity; /**< Descending powers of the root of unity, size `width + 1`. */
|
|
fr_t *roots_of_unity; /**< Powers of the root of unity in bit-reversal permutation, size `width`. */
|
|
} FFTSettings;
|
|
|
|
|
|
/**
|
|
* Stores the setup and parameters needed for computing KZG proofs.
|
|
*/
|
|
typedef struct {
|
|
const FFTSettings *fs; /**< The corresponding settings for performing FFTs */
|
|
g1_t *g1_values; /**< G1 group elements from the trusted setup, in Lagrange form bit-reversal permutation */
|
|
g2_t *g2_values; /**< G2 group elements from the trusted setup */
|
|
uint64_t length; /**< The number of elements in g1_values */
|
|
} KZGSettings;
|
|
|
|
|
|
/**
|
|
* Lagrange form polynomial, with values under the bit-reversal permutation
|
|
*/
|
|
typedef struct {
|
|
fr_t *values; /**< `values[i]` is value of the polynomial at `ω^brp(i)` */
|
|
uint64_t length; /**< One more than the polynomial's degree */
|
|
} PolynomialEvalForm;
|
|
|
|
C_KZG_RET alloc_polynomial(PolynomialEvalForm *out, uint64_t length);
|
|
void free_polynomial(PolynomialEvalForm *p);
|
|
|
|
|
|
/**
|
|
* Interface functions
|
|
*/
|
|
|
|
C_KZG_RET load_trusted_setup(KZGSettings *out, FILE *in);
|
|
|
|
void free_trusted_setup(KZGSettings *s);
|
|
|
|
void bytes_to_bls_field(BLSFieldElement *out, const scalar_t *bytes);
|
|
|
|
void vector_lincomb(BLSFieldElement out[], const BLSFieldElement *vectors, const BLSFieldElement *scalars, uint64_t num_vectors, uint64_t vector_len);
|
|
|
|
void g1_lincomb(KZGCommitment *out, const KZGCommitment points[], const BLSFieldElement scalars[], uint64_t num_points);
|
|
|
|
void blob_to_kzg_commitment(KZGCommitment *out, const BLSFieldElement blob[], const KZGSettings *s);
|
|
|
|
C_KZG_RET verify_kzg_proof(bool *out, const KZGCommitment *polynomial_kzg, const BLSFieldElement *z, const BLSFieldElement *y, const KZGProof *kzg_proof, const KZGSettings *s);
|
|
|
|
C_KZG_RET compute_kzg_proof(KZGProof *out, const PolynomialEvalForm *polynomial, const BLSFieldElement *z, const KZGSettings *s);
|
|
|
|
C_KZG_RET evaluate_polynomial_in_evaluation_form(BLSFieldElement *out, const PolynomialEvalForm *polynomial, const BLSFieldElement *z, const KZGSettings *s);
|
|
|
|
void compute_powers(BLSFieldElement out[], const BLSFieldElement *x, uint64_t n);
|
|
|
|
#endif // C_KZG_4844_H
|