bpo-40791: Use CRYPTO_memcmp() for compare_digest (#20456)
hashlib.compare_digest uses OpenSSL's CRYPTO_memcmp() function
when OpenSSL is available.
Note: The _operator module is a builtin module. I don't want to add
libcrypto dependency to libpython. Therefore I duplicated the wrapper
function and added a copy to _hashopenssl.c.
diff --git a/Modules/_operator.c b/Modules/_operator.c
index 19026b6..8a54829 100644
--- a/Modules/_operator.c
+++ b/Modules/_operator.c
@@ -785,6 +785,8 @@
return PyObject_LengthHint(obj, default_value);
}
+/* NOTE: Keep in sync with _hashopenssl.c implementation. */
+
/*[clinic input]
_operator._compare_digest = _operator.eq