ssue #19183: Implement PEP 456 'secure and interchangeable hash algorithm'.
Python now uses SipHash24 on all major platforms.
diff --git a/Python/sysmodule.c b/Python/sysmodule.c
index 35a0671..4028a01 100644
--- a/Python/sysmodule.c
+++ b/Python/sysmodule.c
@@ -658,7 +658,7 @@
"hash_info\n\
\n\
A struct sequence providing parameters used for computing\n\
-numeric hashes. The attributes are read only.");
+hashes. The attributes are read only.");
static PyStructSequence_Field hash_info_fields[] = {
{"width", "width of the type used for hashing, in bits"},
@@ -667,6 +667,11 @@
{"inf", "value to be used for hash of a positive infinity"},
{"nan", "value to be used for hash of a nan"},
{"imag", "multiplier used for the imaginary part of a complex number"},
+ {"algorithm", "name of the algorithm for hashing of str, bytes and "
+ "memoryviews"},
+ {"hash_bits", "internal output size of hash algorithm"},
+ {"seed_bits", "seed size of hash algorithm"},
+ {"cutoff", "small string optimization cutoff"},
{NULL, NULL}
};
@@ -674,7 +679,7 @@
"sys.hash_info",
hash_info_doc,
hash_info_fields,
- 5,
+ 9,
};
static PyObject *
@@ -682,9 +687,11 @@
{
PyObject *hash_info;
int field = 0;
+ PyHash_FuncDef *hashfunc;
hash_info = PyStructSequence_New(&Hash_InfoType);
if (hash_info == NULL)
return NULL;
+ hashfunc = PyHash_GetFuncDef();
PyStructSequence_SET_ITEM(hash_info, field++,
PyLong_FromLong(8*sizeof(Py_hash_t)));
PyStructSequence_SET_ITEM(hash_info, field++,
@@ -695,6 +702,14 @@
PyLong_FromLong(_PyHASH_NAN));
PyStructSequence_SET_ITEM(hash_info, field++,
PyLong_FromLong(_PyHASH_IMAG));
+ PyStructSequence_SET_ITEM(hash_info, field++,
+ PyUnicode_FromString(hashfunc->name));
+ PyStructSequence_SET_ITEM(hash_info, field++,
+ PyLong_FromLong(hashfunc->hash_bits));
+ PyStructSequence_SET_ITEM(hash_info, field++,
+ PyLong_FromLong(hashfunc->seed_bits));
+ PyStructSequence_SET_ITEM(hash_info, field++,
+ PyLong_FromLong(Py_HASH_CUTOFF));
if (PyErr_Occurred()) {
Py_CLEAR(hash_info);
return NULL;
@@ -1338,6 +1353,7 @@
executable -- absolute path of the executable binary of the Python interpreter\n\
float_info -- a struct sequence with information about the float implementation.\n\
float_repr_style -- string indicating the style of repr() output for floats\n\
+hash_info -- a struct sequence with information about the hash algorithm.\n\
hexversion -- version information encoded as a single integer\n\
implementation -- Python implementation information.\n\
int_info -- a struct sequence with information about the int implementation.\n\