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/*
This file is part of ethash.
ethash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
ethash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with ethash. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file ethash.h
* @date 2015
*/
#pragma once
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <stddef.h>
#include "compiler.h"
#define REVISION 23
#define DATASET_BYTES_INIT 1073741824U // 2**30
#define DATASET_BYTES_GROWTH 8388608U // 2**23
#define CACHE_BYTES_INIT 1073741824U // 2**24
#define CACHE_BYTES_GROWTH 131072U // 2**17
#define EPOCH_LENGTH 30000U
#define MIX_BYTES 128
#define HASH_BYTES 64
#define DATASET_PARENTS 256
#define CACHE_ROUNDS 3
#define ACCESSES 64
#ifdef __cplusplus
extern "C" {
#endif
typedef struct ethash_params {
uint64_t full_size; // Size of full data set (in bytes, multiple of mix size (128)).
uint64_t cache_size; // Size of compute cache (in bytes, multiple of node size (64)).
} ethash_params;
typedef struct ethash_return_value {
uint8_t result[32];
uint8_t mix_hash[32];
} ethash_return_value;
uint64_t ethash_get_datasize(const uint32_t block_number);
uint64_t ethash_get_cachesize(const uint32_t block_number);
// initialize the parameters
static inline void ethash_params_init(ethash_params *params, const uint32_t block_number) {
params->full_size = ethash_get_datasize(block_number);
params->cache_size = ethash_get_cachesize(block_number);
}
typedef struct ethash_cache {
void *mem;
} ethash_cache;
void ethash_mkcache(ethash_cache *cache, ethash_params const *params, const uint8_t seed[32]);
void ethash_compute_full_data(void *mem, ethash_params const *params, ethash_cache const *cache);
void ethash_full(ethash_return_value *ret, void const *full_mem, ethash_params const *params, const uint8_t header_hash[32], const uint64_t nonce);
void ethash_light(ethash_return_value *ret, ethash_cache const *cache, ethash_params const *params, const uint8_t header_hash[32], const uint64_t nonce);
void ethash_get_seedhash(uint8_t seedhash[32], const uint32_t block_number);
static inline void ethash_prep_light(void *cache, ethash_params const *params, const uint8_t seed[32]) {
ethash_cache c;
c.mem = cache;
ethash_mkcache(&c, params, seed);
}
static inline void ethash_compute_light(ethash_return_value *ret, void const *cache, ethash_params const *params, const uint8_t header_hash[32], const uint64_t nonce) {
ethash_cache c;
c.mem = (void *) cache;
ethash_light(ret, &c, params, header_hash, nonce);
}
static inline void ethash_prep_full(void *full, ethash_params const *params, void const *cache) {
ethash_cache c;
c.mem = (void *) cache;
ethash_compute_full_data(full, params, &c);
}
static inline void ethash_compute_full(ethash_return_value *ret, void const *full, ethash_params const *params, const uint8_t header_hash[32], const uint64_t nonce) {
ethash_full(ret, full, params, header_hash, nonce);
}
/// @brief Compare two s256-bit big-endian values.
/// @returns 1 if @a a is less than or equal to @a b, 0 otherwise.
/// Both parameters are 256-bit big-endian values.
static inline int ethash_leq_be256(const uint8_t a[32], const uint8_t b[32]) {
// Boundary is big endian
for (int i = 0; i < 32; i++) {
if (a[i] == b[i])
continue;
return a[i] < b[i];
}
return 1;
}
/// Perofrms a cursory check on the validity of the nonce.
/// @returns 1 if the nonce may possibly be valid for the given header_hash & boundary.
/// @p boundary equivalent to 2 ^ 256 / block_difficulty, represented as a 256-bit big-endian.
int ethash_preliminary_check_boundary(
const uint8_t header_hash[32],
const uint64_t nonce,
const uint8_t mix_hash[32],
const uint8_t boundary[32]);
#define ethash_quick_check_difficulty ethash_preliminary_check_boundary
#define ethash_check_difficulty ethash_leq_be256
#ifdef __cplusplus
}
#endif
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