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/* MD5 module */
/* This module provides an interface to the MD5 algorithm */
/* See below for information about the original code this module was
based upon. Additional work performed by:
Andrew Kuchling (amk@amk.ca)
Greg Stein (gstein@lyra.org)
Trevor Perrin (trevp@trevp.net)
Copyright (C) 2005-2007 Gregory P. Smith (greg@krypto.org)
Licensed to PSF under a Contributor Agreement.
*/
/* MD5 objects */
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#include "hashlib.h"
#include "pycore_strhex.h" // _Py_strhex()
#include "pycore_typeobject.h" // _PyType_GetModuleState()
/*[clinic input]
module _md5
class MD5Type "MD5object *" "&PyType_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=6e5261719957a912]*/
/* Some useful types */
#if SIZEOF_INT == 4
typedef unsigned int MD5_INT32; /* 32-bit integer */
typedef long long MD5_INT64; /* 64-bit integer */
#else
/* not defined. compilation will die. */
#endif
/* The MD5 block size and message digest sizes, in bytes */
#define MD5_BLOCKSIZE 64
#define MD5_DIGESTSIZE 16
#include "_hacl/Hacl_Hash_MD5.h"
typedef struct {
PyObject_HEAD
// Prevents undefined behavior via multiple threads entering the C API.
// The lock will be NULL before threaded access has been enabled.
PyThread_type_lock lock;
Hacl_Streaming_MD5_state *hash_state;
} MD5object;
#include "clinic/md5module.c.h"
typedef struct {
PyTypeObject* md5_type;
} MD5State;
static inline MD5State*
md5_get_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (MD5State *)state;
}
static MD5object *
newMD5object(MD5State * st)
{
MD5object *md5 = (MD5object *)PyObject_GC_New(MD5object, st->md5_type);
md5->lock = NULL;
PyObject_GC_Track(md5);
return md5;
}
/* Internal methods for a hash object */
static int
MD5_traverse(PyObject *ptr, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(ptr));
return 0;
}
static void
MD5_dealloc(MD5object *ptr)
{
Hacl_Streaming_MD5_legacy_free(ptr->hash_state);
if (ptr->lock != NULL) {
PyThread_free_lock(ptr->lock);
}
PyTypeObject *tp = Py_TYPE(ptr);
PyObject_GC_UnTrack(ptr);
PyObject_GC_Del(ptr);
Py_DECREF(tp);
}
/* External methods for a hash object */
/*[clinic input]
MD5Type.copy
cls: defining_class
Return a copy of the hash object.
[clinic start generated code]*/
static PyObject *
MD5Type_copy_impl(MD5object *self, PyTypeObject *cls)
/*[clinic end generated code: output=bf055e08244bf5ee input=d89087dcfb2a8620]*/
{
MD5State *st = _PyType_GetModuleState(cls);
MD5object *newobj;
if ((newobj = newMD5object(st))==NULL)
return NULL;
ENTER_HASHLIB(self);
newobj->hash_state = Hacl_Streaming_MD5_legacy_copy(self->hash_state);
LEAVE_HASHLIB(self);
return (PyObject *)newobj;
}
/*[clinic input]
MD5Type.digest
Return the digest value as a bytes object.
[clinic start generated code]*/
static PyObject *
MD5Type_digest_impl(MD5object *self)
/*[clinic end generated code: output=eb691dc4190a07ec input=bc0c4397c2994be6]*/
{
unsigned char digest[MD5_DIGESTSIZE];
ENTER_HASHLIB(self);
Hacl_Streaming_MD5_legacy_finish(self->hash_state, digest);
LEAVE_HASHLIB(self);
return PyBytes_FromStringAndSize((const char *)digest, MD5_DIGESTSIZE);
}
/*[clinic input]
MD5Type.hexdigest
Return the digest value as a string of hexadecimal digits.
[clinic start generated code]*/
static PyObject *
MD5Type_hexdigest_impl(MD5object *self)
/*[clinic end generated code: output=17badced1f3ac932 input=b60b19de644798dd]*/
{
unsigned char digest[MD5_DIGESTSIZE];
ENTER_HASHLIB(self);
Hacl_Streaming_MD5_legacy_finish(self->hash_state, digest);
LEAVE_HASHLIB(self);
return _Py_strhex((const char*)digest, MD5_DIGESTSIZE);
}
static void update(Hacl_Streaming_MD5_state *state, uint8_t *buf, Py_ssize_t len) {
#if PY_SSIZE_T_MAX > UINT32_MAX
while (len > UINT32_MAX) {
Hacl_Streaming_MD5_legacy_update(state, buf, UINT32_MAX);
len -= UINT32_MAX;
buf += UINT32_MAX;
}
#endif
Hacl_Streaming_MD5_legacy_update(state, buf, (uint32_t) len);
}
/*[clinic input]
MD5Type.update
obj: object
/
Update this hash object's state with the provided string.
[clinic start generated code]*/
static PyObject *
MD5Type_update(MD5object *self, PyObject *obj)
/*[clinic end generated code: output=f6ad168416338423 input=6e1efcd9ecf17032]*/
{
Py_buffer buf;
GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
if (self->lock == NULL && buf.len >= HASHLIB_GIL_MINSIZE) {
self->lock = PyThread_allocate_lock();
}
if (self->lock != NULL) {
Py_BEGIN_ALLOW_THREADS
PyThread_acquire_lock(self->lock, 1);
update(self->hash_state, buf.buf, buf.len);
PyThread_release_lock(self->lock);
Py_END_ALLOW_THREADS
} else {
update(self->hash_state, buf.buf, buf.len);
}
PyBuffer_Release(&buf);
Py_RETURN_NONE;
}
static PyMethodDef MD5_methods[] = {
MD5TYPE_COPY_METHODDEF
MD5TYPE_DIGEST_METHODDEF
MD5TYPE_HEXDIGEST_METHODDEF
MD5TYPE_UPDATE_METHODDEF
{NULL, NULL} /* sentinel */
};
static PyObject *
MD5_get_block_size(PyObject *self, void *closure)
{
return PyLong_FromLong(MD5_BLOCKSIZE);
}
static PyObject *
MD5_get_name(PyObject *self, void *closure)
{
return PyUnicode_FromStringAndSize("md5", 3);
}
static PyObject *
md5_get_digest_size(PyObject *self, void *closure)
{
return PyLong_FromLong(MD5_DIGESTSIZE);
}
static PyGetSetDef MD5_getseters[] = {
{"block_size",
(getter)MD5_get_block_size, NULL,
NULL,
NULL},
{"name",
(getter)MD5_get_name, NULL,
NULL,
NULL},
{"digest_size",
(getter)md5_get_digest_size, NULL,
NULL,
NULL},
{NULL} /* Sentinel */
};
static PyType_Slot md5_type_slots[] = {
{Py_tp_dealloc, MD5_dealloc},
{Py_tp_methods, MD5_methods},
{Py_tp_getset, MD5_getseters},
{Py_tp_traverse, MD5_traverse},
{0,0}
};
static PyType_Spec md5_type_spec = {
.name = "_md5.md5",
.basicsize = sizeof(MD5object),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION |
Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
.slots = md5_type_slots
};
/* The single module-level function: new() */
/*[clinic input]
_md5.md5
string: object(c_default="NULL") = b''
*
usedforsecurity: bool = True
Return a new MD5 hash object; optionally initialized with a string.
[clinic start generated code]*/
static PyObject *
_md5_md5_impl(PyObject *module, PyObject *string, int usedforsecurity)
/*[clinic end generated code: output=587071f76254a4ac input=7a144a1905636985]*/
{
MD5object *new;
Py_buffer buf;
if (string)
GET_BUFFER_VIEW_OR_ERROUT(string, &buf);
MD5State *st = md5_get_state(module);
if ((new = newMD5object(st)) == NULL) {
if (string)
PyBuffer_Release(&buf);
return NULL;
}
new->hash_state = Hacl_Streaming_MD5_legacy_create_in();
if (PyErr_Occurred()) {
Py_DECREF(new);
if (string)
PyBuffer_Release(&buf);
return NULL;
}
if (string) {
if (buf.len >= HASHLIB_GIL_MINSIZE) {
/* We do not initialize self->lock here as this is the constructor
* where it is not yet possible to have concurrent access. */
Py_BEGIN_ALLOW_THREADS
update(new->hash_state, buf.buf, buf.len);
Py_END_ALLOW_THREADS
} else {
update(new->hash_state, buf.buf, buf.len);
}
PyBuffer_Release(&buf);
}
return (PyObject *)new;
}
/* List of functions exported by this module */
static struct PyMethodDef MD5_functions[] = {
_MD5_MD5_METHODDEF
{NULL, NULL} /* Sentinel */
};
static int
_md5_traverse(PyObject *module, visitproc visit, void *arg)
{
MD5State *state = md5_get_state(module);
Py_VISIT(state->md5_type);
return 0;
}
static int
_md5_clear(PyObject *module)
{
MD5State *state = md5_get_state(module);
Py_CLEAR(state->md5_type);
return 0;
}
static void
_md5_free(void *module)
{
_md5_clear((PyObject *)module);
}
/* Initialize this module. */
static int
md5_exec(PyObject *m)
{
MD5State *st = md5_get_state(m);
st->md5_type = (PyTypeObject *)PyType_FromModuleAndSpec(
m, &md5_type_spec, NULL);
if (PyModule_AddObjectRef(m, "MD5Type", (PyObject *)st->md5_type) < 0) {
return -1;
}
return 0;
}
static PyModuleDef_Slot _md5_slots[] = {
{Py_mod_exec, md5_exec},
{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
{0, NULL}
};
static struct PyModuleDef _md5module = {
PyModuleDef_HEAD_INIT,
.m_name = "_md5",
.m_size = sizeof(MD5State),
.m_methods = MD5_functions,
.m_slots = _md5_slots,
.m_traverse = _md5_traverse,
.m_clear = _md5_clear,
.m_free = _md5_free,
};
PyMODINIT_FUNC
PyInit__md5(void)
{
return PyModuleDef_Init(&_md5module);
}
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