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Wagner | | Makoto Matsumoto | | Takuji Nishimura | | Shawn Cokus | | David Blackman | | Sebastiano Vigna | | Melissa O'Neill | +----------------------------------------------------------------------+ */ #ifndef PHP_RANDOM_H # define PHP_RANDOM_H # include "php.h" PHPAPI double php_combined_lcg(void); /* * A bit of tricky math here. We want to avoid using a modulus because * that simply tosses the high-order bits and might skew the distribution * of random values over the range. Instead we map the range directly. * * We need to map the range from 0...M evenly to the range a...b * Let n = the random number and n' = the mapped random number * * Then we have: n' = a + n(b-a)/M * * We have a problem here in that only n==M will get mapped to b which * means the chances of getting b is much much less than getting any of * the other values in the range. We can fix this by increasing our range * artificially and using: * * n' = a + n(b-a+1)/M * * Now we only have a problem if n==M which would cause us to produce a * number of b+1 which would be bad. So we bump M up by one to make sure * this will never happen, and the final algorithm looks like this: * * n' = a + n(b-a+1)/(M+1) * * -RL */ # define RAND_RANGE_BADSCALING(__n, __min, __max, __tmax) \ (__n) = (__min) + (zend_long) ((double) ( (double) (__max) - (__min) + 1.0) * ((__n) / ((__tmax) + 1.0))) # ifdef PHP_WIN32 # define GENERATE_SEED() (((zend_long) ((zend_ulong) time(NULL) * (zend_ulong) GetCurrentProcessId())) ^ ((zend_long) (1000000.0 * php_combined_lcg()))) # else # define GENERATE_SEED() (((zend_long) ((zend_ulong) time(NULL) * (zend_ulong) getpid())) ^ ((zend_long) (1000000.0 * php_combined_lcg()))) # endif # define PHP_MT_RAND_MAX ((zend_long) (0x7FFFFFFF)) /* (1<<31) - 1 */ # define MT_RAND_MT19937 0 # define MT_RAND_PHP 1 # define MT_N (624) #define PHP_RANDOM_RANGE_ATTEMPTS (50) PHPAPI void php_mt_srand(uint32_t seed); PHPAPI uint32_t php_mt_rand(void); PHPAPI zend_long php_mt_rand_range(zend_long min, zend_long max); PHPAPI zend_long php_mt_rand_common(zend_long min, zend_long max); # ifndef RAND_MAX # define RAND_MAX PHP_MT_RAND_MAX # endif # define PHP_RAND_MAX PHP_MT_RAND_MAX PHPAPI void php_srand(zend_long seed); PHPAPI zend_long php_rand(void); # if !defined(__SIZEOF_INT128__) || defined(PHP_RANDOM_FORCE_EMULATE_128) typedef struct _php_random_uint128_t { uint64_t hi; uint64_t lo; } php_random_uint128_t; static inline uint64_t php_random_uint128_hi(php_random_uint128_t num) { return num.hi; } static inline uint64_t php_random_uint128_lo(php_random_uint128_t num) { return num.lo; } static inline php_random_uint128_t php_random_uint128_constant(uint64_t hi, uint64_t lo) { php_random_uint128_t r; r.hi = hi; r.lo = lo; return r; } static inline php_random_uint128_t php_random_uint128_add(php_random_uint128_t num1, php_random_uint128_t num2) { php_random_uint128_t r; r.lo = (num1.lo + num2.lo); r.hi = (num1.hi + num2.hi + (r.lo < num1.lo)); return r; } static inline php_random_uint128_t php_random_uint128_multiply(php_random_uint128_t num1, php_random_uint128_t num2) { php_random_uint128_t r; const uint64_t x0 = num1.lo & 0xffffffffULL, x1 = num1.lo >> 32, y0 = num2.lo & 0xffffffffULL, y1 = num2.lo >> 32, z0 = (((x1 * y0) + (x0 * y0 >> 32)) & 0xffffffffULL) + x0 * y1; r.hi = num1.hi * num2.lo + num1.lo * num2.hi; r.lo = num1.lo * num2.lo; r.hi += x1 * y1 + ((x1 * y0 + (x0 * y0 >> 32)) >> 32) + (z0 >> 32); return r; } static inline uint64_t php_random_pcgoneseq128xslrr64_rotr64(php_random_uint128_t num) { const uint64_t v = (num.hi ^ num.lo), s = num.hi >> 58U; return (v >> s) | (v << ((-s) & 63)); } # else typedef __uint128_t php_random_uint128_t; static inline uint64_t php_random_uint128_hi(php_random_uint128_t num) { return (uint64_t) (num >> 64); } static inline uint64_t php_random_uint128_lo(php_random_uint128_t num) { return (uint64_t) num; } static inline php_random_uint128_t php_random_uint128_constant(uint64_t hi, uint64_t lo) { php_random_uint128_t r; r = ((php_random_uint128_t) hi << 64) + lo; return r; } static inline php_random_uint128_t php_random_uint128_add(php_random_uint128_t num1, php_random_uint128_t num2) { return num1 + num2; } static inline php_random_uint128_t php_random_uint128_multiply(php_random_uint128_t num1, php_random_uint128_t num2) { return num1 * num2; } static inline uint64_t php_random_pcgoneseq128xslrr64_rotr64(php_random_uint128_t num) { const uint64_t v = ((uint64_t) (num >> 64U)) ^ (uint64_t) num, s = num >> 122U; return (v >> s) | (v << ((-s) & 63)); } # endif PHPAPI zend_result php_random_bytes(void *bytes, size_t size, bool should_throw); PHPAPI zend_result php_random_int(zend_long min, zend_long max, zend_long *result, bool should_throw); static inline zend_result php_random_bytes_throw(void *bytes, size_t size) { return php_random_bytes(bytes, size, true); } static inline zend_result php_random_bytes_silent(void *bytes, size_t size) { return php_random_bytes(bytes, size, false); } static inline zend_result php_random_int_throw(zend_long min, zend_long max, zend_long *result) { return php_random_int(min, max, result, true); } static inline zend_result php_random_int_silent(zend_long min, zend_long max, zend_long *result) { return php_random_int(min, max, result, false); } typedef struct _php_random_status_ { size_t last_generated_size; void *state; } php_random_status; typedef struct _php_random_status_state_combinedlcg { int32_t state[2]; } php_random_status_state_combinedlcg; typedef struct _php_random_status_state_mt19937 { uint32_t state[MT_N]; uint32_t count; uint8_t mode; } php_random_status_state_mt19937; typedef struct _php_random_status_state_pcgoneseq128xslrr64 { php_random_uint128_t state; } php_random_status_state_pcgoneseq128xslrr64; typedef struct _php_random_status_state_xoshiro256starstar { uint64_t state[4]; } php_random_status_state_xoshiro256starstar; typedef struct _php_random_status_state_user { zend_object *object; zend_function *generate_method; } php_random_status_state_user; typedef struct _php_random_algo { const size_t generate_size; const size_t state_size; void (*seed)(php_random_status *status, uint64_t seed); uint64_t (*generate)(php_random_status *status); zend_long (*range)(php_random_status *status, zend_long min, zend_long max); bool (*serialize)(php_random_status *status, HashTable *data); bool (*unserialize)(php_random_status *status, HashTable *data); } php_random_algo; extern PHPAPI const php_random_algo php_random_algo_combinedlcg; extern PHPAPI const php_random_algo php_random_algo_mt19937; extern PHPAPI const php_random_algo php_random_algo_pcgoneseq128xslrr64; extern PHPAPI const php_random_algo php_random_algo_xoshiro256starstar; extern PHPAPI const php_random_algo php_random_algo_secure; extern PHPAPI const php_random_algo php_random_algo_user; typedef struct _php_random_engine { const php_random_algo *algo; php_random_status *status; zend_object std; } php_random_engine; typedef struct _php_random_randomizer { const php_random_algo *algo; php_random_status *status; bool is_userland_algo; zend_object std; } php_random_randomizer; extern PHPAPI zend_class_entry *random_ce_Random_Engine; extern PHPAPI zend_class_entry *random_ce_Random_CryptoSafeEngine; extern PHPAPI zend_class_entry *random_ce_Random_RandomError; extern PHPAPI zend_class_entry *random_ce_Random_BrokenRandomEngineError; extern PHPAPI zend_class_entry *random_ce_Random_RandomException; extern PHPAPI zend_class_entry *random_ce_Random_Engine_PcgOneseq128XslRr64; extern PHPAPI zend_class_entry *random_ce_Random_Engine_Mt19937; extern PHPAPI zend_class_entry *random_ce_Random_Engine_Xoshiro256StarStar; extern PHPAPI zend_class_entry *random_ce_Random_Engine_Secure; extern PHPAPI zend_class_entry *random_ce_Random_Randomizer; extern PHPAPI zend_class_entry *random_ce_Random_IntervalBoundary; static inline php_random_engine *php_random_engine_from_obj(zend_object *object) { return (php_random_engine *)((char *)(object) - XtOffsetOf(php_random_engine, std)); } static inline php_random_randomizer *php_random_randomizer_from_obj(zend_object *object) { return (php_random_randomizer *)((char *)(object) - XtOffsetOf(php_random_randomizer, std)); } # define Z_RANDOM_ENGINE_P(zval) php_random_engine_from_obj(Z_OBJ_P(zval)) # define Z_RANDOM_RANDOMIZER_P(zval) php_random_randomizer_from_obj(Z_OBJ_P(zval)); PHPAPI php_random_status *php_random_status_alloc(const php_random_algo *algo, const bool persistent); PHPAPI php_random_status *php_random_status_copy(const php_random_algo *algo, php_random_status *old_status, php_random_status *new_status); PHPAPI void php_random_status_free(php_random_status *status, const bool persistent); PHPAPI php_random_engine *php_random_engine_common_init(zend_class_entry *ce, zend_object_handlers *handlers, const php_random_algo *algo); PHPAPI void php_random_engine_common_free_object(zend_object *object); PHPAPI zend_object *php_random_engine_common_clone_object(zend_object *object); PHPAPI uint32_t php_random_range32(const php_random_algo *algo, php_random_status *status, uint32_t umax); PHPAPI uint64_t php_random_range64(const php_random_algo *algo, php_random_status *status, uint64_t umax); PHPAPI zend_long php_random_range(const php_random_algo *algo, php_random_status *status, zend_long min, zend_long max); PHPAPI const php_random_algo *php_random_default_algo(void); PHPAPI php_random_status *php_random_default_status(void); PHPAPI zend_string *php_random_bin2hex_le(const void *ptr, const size_t len); PHPAPI bool php_random_hex2bin_le(zend_string *hexstr, void *dest); PHPAPI void php_random_combinedlcg_seed_default(php_random_status_state_combinedlcg *state); PHPAPI void php_random_mt19937_seed_default(php_random_status_state_mt19937 *state); PHPAPI void php_random_pcgoneseq128xslrr64_advance(php_random_status_state_pcgoneseq128xslrr64 *state, uint64_t advance); PHPAPI void php_random_xoshiro256starstar_jump(php_random_status_state_xoshiro256starstar *state); PHPAPI void php_random_xoshiro256starstar_jump_long(php_random_status_state_xoshiro256starstar *state); PHPAPI double php_random_gammasection_closed_open(const php_random_algo *algo, php_random_status *status, double min, double max); PHPAPI double php_random_gammasection_closed_closed(const php_random_algo *algo, php_random_status *status, double min, double max); PHPAPI double php_random_gammasection_open_closed(const php_random_algo *algo, php_random_status *status, double min, double max); PHPAPI double php_random_gammasection_open_open(const php_random_algo *algo, php_random_status *status, double min, double max); extern zend_module_entry random_module_entry; # define phpext_random_ptr &random_module_entry PHP_MINIT_FUNCTION(random); PHP_MSHUTDOWN_FUNCTION(random); PHP_RINIT_FUNCTION(random); ZEND_BEGIN_MODULE_GLOBALS(random) php_random_status *combined_lcg; bool combined_lcg_seeded; php_random_status *mt19937; bool mt19937_seeded; int random_fd; ZEND_END_MODULE_GLOBALS(random) PHPAPI ZEND_EXTERN_MODULE_GLOBALS(random) # define RANDOM_G(v) ZEND_MODULE_GLOBALS_ACCESSOR(random, v) #endif /* PHP_RANDOM_H */