mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-11-01 02:38:53 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 15

bpo-40302: Add pycore_byteswap.h header file (GH-19552)

Browse source 
Add a new internal pycore_byteswap.h header file with the following
functions:

* _Py_bswap16()
* _Py_bswap32()
* _Py_bswap64()

Use these functions in _ctypes, sha256 and sha512 modules,
and also use in the UTF-32 encoder.

sha256, sha512 and _ctypes modules are now built with the internal
C API.
This commit is contained in:
Victor Stinner 2020-04-17 17:47:20 +02:00 • committed by GitHub
parent 485e715cb1
commit 1ae035b7e8
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
13 changed files with 219 additions and 112 deletions
Download patch file Download diff file Expand all files Collapse all files

17
Modules/sha256module.c
View file

@ -17,6 +17,7 @@
/* SHA objects */
#include "Python.h"
#include "pycore_byteswap.h" // _Py_bswap32()
#include "structmember.h" // PyMemberDef
#include "hashlib.h"
#include "pystrhex.h"
@ -30,12 +31,7 @@ class SHA256Type "SHAobject *" "&PyType_Type"
/* Some useful types */
typedef unsigned char SHA_BYTE;
#if SIZEOF_INT == 4
typedef unsigned int SHA_INT32; /* 32-bit integer */
#else
/* not defined. compilation will die. */
#endif
typedef uint32_t SHA_INT32; /* 32-bit integer */
/* The SHA block size and message digest sizes, in bytes */
@ -61,14 +57,9 @@ typedef struct {
#if PY_LITTLE_ENDIAN
static void longReverse(SHA_INT32 *buffer, int byteCount)
{
SHA_INT32 value;
byteCount /= sizeof(*buffer);
while (byteCount--) {
value = *buffer;
value = ( ( value & 0xFF00FF00L ) >> 8 ) | \
( ( value & 0x00FF00FFL ) << 8 );
*buffer++ = ( value << 16 ) | ( value >> 16 );
for (; byteCount--; buffer++) {
*buffer = _Py_bswap32(*buffer);
}
}
#endif