cpython/Modules/sha1module.c

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/* SHA1 module */
/* This module provides an interface to the SHA1 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.
*/
/* SHA1 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 _sha1
class SHA1Type "SHA1object *" "&PyType_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=3dc9a20d1becb759]*/
/* Some useful types */
#if SIZEOF_INT == 4
typedef unsigned int SHA1_INT32; /* 32-bit integer */
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typedef long long SHA1_INT64; /* 64-bit integer */
#else
/* not defined. compilation will die. */
#endif
/* The SHA1 block size and message digest sizes, in bytes */
#define SHA1_BLOCKSIZE 64
#define SHA1_DIGESTSIZE 20
#include "_hacl/Hacl_Hash_SHA1.h"
typedef struct {
PyObject_HEAD
// Prevents undefined behavior via multiple threads entering the C API.
bool use_mutex;
PyMutex mutex;
PyThread_type_lock lock;
Hacl_Hash_SHA1_state_t *hash_state;
} SHA1object;
#include "clinic/sha1module.c.h"
typedef struct {
PyTypeObject* sha1_type;
} SHA1State;
static inline SHA1State*
sha1_get_state(PyObject *module)
{
void *state = PyModule_GetState(module);
assert(state != NULL);
return (SHA1State *)state;
}
static SHA1object *
newSHA1object(SHA1State *st)
{
SHA1object *sha = (SHA1object *)PyObject_GC_New(SHA1object, st->sha1_type);
if (sha == NULL) {
return NULL;
}
HASHLIB_INIT_MUTEX(sha);
PyObject_GC_Track(sha);
return sha;
}
/* Internal methods for a hash object */
static int
SHA1_traverse(PyObject *ptr, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(ptr));
return 0;
}
static void
SHA1_dealloc(SHA1object *ptr)
{
Hacl_Hash_SHA1_free(ptr->hash_state);
PyTypeObject *tp = Py_TYPE(ptr);
PyObject_GC_UnTrack(ptr);
PyObject_GC_Del(ptr);
Py_DECREF(tp);
}
/* External methods for a hash object */
/*[clinic input]
SHA1Type.copy
cls: defining_class
Return a copy of the hash object.
[clinic start generated code]*/
static PyObject *
SHA1Type_copy_impl(SHA1object *self, PyTypeObject *cls)
/*[clinic end generated code: output=b32d4461ce8bc7a7 input=6c22e66fcc34c58e]*/
{
SHA1State *st = _PyType_GetModuleState(cls);
SHA1object *newobj;
if ((newobj = newSHA1object(st)) == NULL)
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return NULL;
ENTER_HASHLIB(self);
newobj->hash_state = Hacl_Hash_SHA1_copy(self->hash_state);
LEAVE_HASHLIB(self);
return (PyObject *)newobj;
}
/*[clinic input]
SHA1Type.digest
Return the digest value as a bytes object.
[clinic start generated code]*/
static PyObject *
SHA1Type_digest_impl(SHA1object *self)
/*[clinic end generated code: output=2f05302a7aa2b5cb input=13824b35407444bd]*/
{
unsigned char digest[SHA1_DIGESTSIZE];
ENTER_HASHLIB(self);
Hacl_Hash_SHA1_digest(self->hash_state, digest);
LEAVE_HASHLIB(self);
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return PyBytes_FromStringAndSize((const char *)digest, SHA1_DIGESTSIZE);
}
/*[clinic input]
SHA1Type.hexdigest
Return the digest value as a string of hexadecimal digits.
[clinic start generated code]*/
static PyObject *
SHA1Type_hexdigest_impl(SHA1object *self)
/*[clinic end generated code: output=4161fd71e68c6659 input=97691055c0c74ab0]*/
{
unsigned char digest[SHA1_DIGESTSIZE];
ENTER_HASHLIB(self);
Hacl_Hash_SHA1_digest(self->hash_state, digest);
LEAVE_HASHLIB(self);
return _Py_strhex((const char *)digest, SHA1_DIGESTSIZE);
}
static void update(Hacl_Hash_SHA1_state_t *state, uint8_t *buf, Py_ssize_t len) {
#if PY_SSIZE_T_MAX > UINT32_MAX
while (len > UINT32_MAX) {
Hacl_Hash_SHA1_update(state, buf, UINT32_MAX);
len -= UINT32_MAX;
buf += UINT32_MAX;
}
#endif
Hacl_Hash_SHA1_update(state, buf, (uint32_t) len);
}
/*[clinic input]
SHA1Type.update
obj: object
/
Update this hash object's state with the provided string.
[clinic start generated code]*/
static PyObject *
SHA1Type_update(SHA1object *self, PyObject *obj)
/*[clinic end generated code: output=d9902f0e5015e9ae input=aad8e07812edbba3]*/
{
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Py_buffer buf;
GET_BUFFER_VIEW_OR_ERROUT(obj, &buf);
if (!self->use_mutex && buf.len >= HASHLIB_GIL_MINSIZE) {
self->use_mutex = true;
}
if (self->use_mutex) {
Py_BEGIN_ALLOW_THREADS
PyMutex_Lock(&self->mutex);
update(self->hash_state, buf.buf, buf.len);
PyMutex_Unlock(&self->mutex);
Py_END_ALLOW_THREADS
} else {
update(self->hash_state, buf.buf, buf.len);
}
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PyBuffer_Release(&buf);
Py_RETURN_NONE;
}
static PyMethodDef SHA1_methods[] = {
SHA1TYPE_COPY_METHODDEF
SHA1TYPE_DIGEST_METHODDEF
SHA1TYPE_HEXDIGEST_METHODDEF
SHA1TYPE_UPDATE_METHODDEF
{NULL, NULL} /* sentinel */
};
static PyObject *
SHA1_get_block_size(PyObject *self, void *closure)
{
return PyLong_FromLong(SHA1_BLOCKSIZE);
}
static PyObject *
SHA1_get_name(PyObject *self, void *closure)
{
return PyUnicode_FromStringAndSize("sha1", 4);
}
static PyObject *
sha1_get_digest_size(PyObject *self, void *closure)
{
return PyLong_FromLong(SHA1_DIGESTSIZE);
}
static PyGetSetDef SHA1_getseters[] = {
{"block_size",
(getter)SHA1_get_block_size, NULL,
NULL,
NULL},
{"name",
(getter)SHA1_get_name, NULL,
NULL,
NULL},
{"digest_size",
(getter)sha1_get_digest_size, NULL,
NULL,
NULL},
{NULL} /* Sentinel */
};
static PyType_Slot sha1_type_slots[] = {
{Py_tp_dealloc, SHA1_dealloc},
{Py_tp_methods, SHA1_methods},
{Py_tp_getset, SHA1_getseters},
{Py_tp_traverse, SHA1_traverse},
{0,0}
};
static PyType_Spec sha1_type_spec = {
.name = "_sha1.sha1",
.basicsize = sizeof(SHA1object),
.flags = (Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION |
Py_TPFLAGS_IMMUTABLETYPE | Py_TPFLAGS_HAVE_GC),
.slots = sha1_type_slots
};
/* The single module-level function: new() */
/*[clinic input]
_sha1.sha1
string: object(c_default="NULL") = b''
*
usedforsecurity: bool = True
Return a new SHA1 hash object; optionally initialized with a string.
[clinic start generated code]*/
static PyObject *
_sha1_sha1_impl(PyObject *module, PyObject *string, int usedforsecurity)
/*[clinic end generated code: output=6f8b3af05126e18e input=bd54b68e2bf36a8a]*/
{
SHA1object *new;
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Py_buffer buf;
if (string)
GET_BUFFER_VIEW_OR_ERROUT(string, &buf);
SHA1State *st = sha1_get_state(module);
if ((new = newSHA1object(st)) == NULL) {
if (string)
PyBuffer_Release(&buf);
return NULL;
}
new->hash_state = Hacl_Hash_SHA1_malloc();
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);
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}
return (PyObject *)new;
}
/* List of functions exported by this module */
static struct PyMethodDef SHA1_functions[] = {
_SHA1_SHA1_METHODDEF
{NULL, NULL} /* Sentinel */
};
static int
_sha1_traverse(PyObject *module, visitproc visit, void *arg)
{
SHA1State *state = sha1_get_state(module);
Py_VISIT(state->sha1_type);
return 0;
}
static int
_sha1_clear(PyObject *module)
{
SHA1State *state = sha1_get_state(module);
Py_CLEAR(state->sha1_type);
return 0;
}
static void
_sha1_free(void *module)
{
_sha1_clear((PyObject *)module);
}
static int
_sha1_exec(PyObject *module)
{
SHA1State* st = sha1_get_state(module);
st->sha1_type = (PyTypeObject *)PyType_FromModuleAndSpec(
module, &sha1_type_spec, NULL);
if (PyModule_AddObjectRef(module,
"SHA1Type",
(PyObject *)st->sha1_type) < 0) {
return -1;
}
return 0;
}
/* Initialize this module. */
static PyModuleDef_Slot _sha1_slots[] = {
{Py_mod_exec, _sha1_exec},
{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
{Py_mod_gil, Py_MOD_GIL_NOT_USED},
{0, NULL}
};
static struct PyModuleDef _sha1module = {
PyModuleDef_HEAD_INIT,
.m_name = "_sha1",
.m_size = sizeof(SHA1State),
.m_methods = SHA1_functions,
.m_slots = _sha1_slots,
.m_traverse = _sha1_traverse,
.m_clear = _sha1_clear,
.m_free = _sha1_free
};
PyMODINIT_FUNC
PyInit__sha1(void)
{
return PyModuleDef_Init(&_sha1module);
}