cpython/Include/internal/pycore_pyhash.h

#ifndef Py_INTERNAL_PYHASH_H
#define Py_INTERNAL_PYHASH_H

#ifndef Py_BUILD_CORE
#  error "this header requires Py_BUILD_CORE define"
#endif

// Similar to Py_HashPointer(), but don't replace -1 with -2.
static inline Py_hash_t
_Py_HashPointerRaw(const void *ptr)
{ … }

/* Hash secret
 *
 * memory layout on 64 bit systems
 *   cccccccc cccccccc cccccccc  uc -- unsigned char[24]
 *   pppppppp ssssssss ........  fnv -- two Py_hash_t
 *   k0k0k0k0 k1k1k1k1 ........  siphash -- two uint64_t
 *   ........ ........ ssssssss  djbx33a -- 16 bytes padding + one Py_hash_t
 *   ........ ........ eeeeeeee  pyexpat XML hash salt
 *
 * memory layout on 32 bit systems
 *   cccccccc cccccccc cccccccc  uc
 *   ppppssss ........ ........  fnv -- two Py_hash_t
 *   k0k0k0k0 k1k1k1k1 ........  siphash -- two uint64_t (*)
 *   ........ ........ ssss....  djbx33a -- 16 bytes padding + one Py_hash_t
 *   ........ ........ eeee....  pyexpat XML hash salt
 *
 * (*) The siphash member may not be available on 32 bit platforms without
 *     an unsigned int64 data type.
 */
_Py_HashSecret_t;

// Export for '_elementtree' shared extension
PyAPI_DATA(_Py_HashSecret_t) _Py_HashSecret;

#ifdef Py_DEBUG
extern int _Py_HashSecret_Initialized;
#endif


struct pyhash_runtime_state { … };

#ifndef MS_WINDOWS
#define _py_urandom_cache_INIT …
#else
#define _py_urandom_cache_INIT …
#endif

#define pyhash_state_INIT …


extern uint64_t _Py_KeyedHash(uint64_t key, const void *src, Py_ssize_t src_sz);

#endif  // !Py_INTERNAL_PYHASH_H