diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/ethereum/ethash/src/libethash/ethash.h')
| -rw-r--r-- | Godeps/_workspace/src/github.com/ethereum/ethash/src/libethash/ethash.h | 75 |
1 files changed, 41 insertions, 34 deletions
diff --git a/Godeps/_workspace/src/github.com/ethereum/ethash/src/libethash/ethash.h b/Godeps/_workspace/src/github.com/ethereum/ethash/src/libethash/ethash.h index a7159de65..eb3097307 100644 --- a/Godeps/_workspace/src/github.com/ethereum/ethash/src/libethash/ethash.h +++ b/Godeps/_workspace/src/github.com/ethereum/ethash/src/libethash/ethash.h @@ -43,26 +43,26 @@ extern "C" { #endif typedef struct ethash_params { - size_t full_size; // Size of full data set (in bytes, multiple of mix size (128)). - size_t cache_size; // Size of compute cache (in bytes, multiple of node size (64)). + 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]; + uint8_t result[32]; + uint8_t mix_hash[32]; } ethash_return_value; -size_t ethash_get_datasize(const uint32_t block_number); -size_t ethash_get_cachesize(const uint32_t block_number); +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); + params->full_size = ethash_get_datasize(block_number); + params->cache_size = ethash_get_cachesize(block_number); } typedef struct ethash_cache { - void *mem; + void *mem; } ethash_cache; void ethash_mkcache(ethash_cache *cache, ethash_params const *params, const uint8_t seed[32]); @@ -72,44 +72,51 @@ void ethash_light(ethash_return_value *ret, ethash_cache const *cache, ethash_pa 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); + 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); + 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); + 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); + ethash_full(ret, full, params, header_hash, nonce); } -// Returns if hash is less than or equal to difficulty -static inline int ethash_check_difficulty( - const uint8_t hash[32], - const uint8_t difficulty[32]) { - // Difficulty is big endian - for (int i = 0; i < 32; i++) { - if (hash[i] == difficulty[i]) continue; - return hash[i] < difficulty[i]; - } - return 1; +/// @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; } -int ethash_quick_check_difficulty( - const uint8_t header_hash[32], - const uint64_t nonce, - const uint8_t mix_hash[32], - const uint8_t difficulty[32]); +/// 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 } |