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/**
* sha256module.cpp -- Python wrappers around Crypto++'s SHA-256
*/
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#if (PY_VERSION_HEX < 0x02050000)
typedef int Py_ssize_t;
#endif
#include <assert.h>
/* from Crypto++ */
#ifdef DISABLE_EMBEDDED_CRYPTOPP
#include <cryptopp/sha.h>
#include <cryptopp/hex.h>
#include <cryptopp/filters.h>
#else
#include <embeddedcryptopp/sha.h>
#include <embeddedcryptopp/hex.h>
#include <embeddedcryptopp/filters.h>
#endif
static const char*const sha256___doc__ = "_sha256 hash function";
static PyObject *sha256_error;
typedef struct {
PyObject_HEAD
/* internal */
CryptoPP::SHA256* h;
PyStringObject* digest;
} SHA256;
PyDoc_STRVAR(SHA256__doc__,
"a SHA256 hash object\n\
Its constructor takes an optional string, which has the same effect as\n\
calling .update() with that string.");
static PyObject *
SHA256_update(SHA256* self, PyObject* msgobj) {
if (self->digest)
return PyErr_Format(sha256_error, "Precondition violation: once .digest() has been called you are required to never call .update() again.");
const char *msg;
Py_ssize_t msgsize;
if (PyString_AsStringAndSize(msgobj, const_cast<char**>(&msg), &msgsize))
return NULL;
self->h->Update(reinterpret_cast<const byte*>(msg), msgsize);
Py_RETURN_NONE;
}
PyDoc_STRVAR(SHA256_update__doc__,
"Update the hash object with the string msg. Repeated calls are equivalent to\n\
a single call with the concatenation of all the messages.");
static PyObject *
SHA256_digest(SHA256* self, PyObject* dummy) {
if (!self->digest) {
assert (self->h);
self->digest = reinterpret_cast<PyStringObject*>(PyString_FromStringAndSize(NULL, self->h->DigestSize()));
if (!self->digest)
return NULL;
self->h->Final(reinterpret_cast<byte*>(PyString_AS_STRING(self->digest)));
}
Py_INCREF(self->digest);
return reinterpret_cast<PyObject*>(self->digest);
}
PyDoc_STRVAR(SHA256_digest__doc__,
"Return the binary digest of the messages that were passed to the update()\n\
method (including the initial message if any).");
static PyObject *
SHA256_hexdigest(SHA256* self, PyObject* dummy) {
PyObject* digest = SHA256_digest(self, NULL);
if (!digest)
return NULL;
Py_ssize_t dsize = PyString_GET_SIZE(digest);
PyStringObject* hexdigest = reinterpret_cast<PyStringObject*>(PyString_FromStringAndSize(NULL, dsize*2));
CryptoPP::ArraySink* as = new CryptoPP::ArraySink(reinterpret_cast<byte*>(PyString_AS_STRING(hexdigest)), dsize*2);
CryptoPP::HexEncoder enc;
enc.Attach(as);
enc.Put(reinterpret_cast<const byte*>(PyString_AS_STRING(digest)), static_cast<size_t>(dsize));
Py_DECREF(digest); digest = NULL;
return reinterpret_cast<PyObject*>(hexdigest);
}
PyDoc_STRVAR(SHA256_hexdigest__doc__,
"Return the hex-encoded digest of the messages that were passed to the update()\n\
method (including the initial message if any).");
static PyMethodDef SHA256_methods[] = {
{"update", reinterpret_cast<PyCFunction>(SHA256_update), METH_O, SHA256_update__doc__},
{"digest", reinterpret_cast<PyCFunction>(SHA256_digest), METH_NOARGS, SHA256_digest__doc__},
{"hexdigest", reinterpret_cast<PyCFunction>(SHA256_hexdigest), METH_NOARGS, SHA256_hexdigest__doc__},
{NULL},
};
static PyObject *
SHA256_new(PyTypeObject* type, PyObject *args, PyObject *kwdict) {
SHA256* self = reinterpret_cast<SHA256*>(type->tp_alloc(type, 0));
if (!self)
return NULL;
self->h = new CryptoPP::SHA256();
if (!self->h)
return PyErr_NoMemory();
self->digest = NULL;
return reinterpret_cast<PyObject*>(self);
}
static void
SHA256_dealloc(SHA256* self) {
Py_XDECREF(self->digest);
delete self->h;
self->ob_type->tp_free((PyObject*)self);
}
static int
SHA256_init(PyObject* self, PyObject *args, PyObject *kwdict) {
static const char *kwlist[] = { "msg", NULL };
const char *msg = NULL;
Py_ssize_t msgsize = 0;
if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|t#", const_cast<char**>(kwlist), &msg, &msgsize))
return -1;
if (msg)
reinterpret_cast<SHA256*>(self)->h->Update(reinterpret_cast<const byte*>(msg), msgsize);
return 0;
}
static PyTypeObject SHA256_type = {
PyObject_HEAD_INIT(NULL)
0, /*ob_size*/
"_sha256.SHA256", /*tp_name*/
sizeof(SHA256), /*tp_basicsize*/
0, /*tp_itemsize*/
reinterpret_cast<destructor>(SHA256_dealloc), /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
0, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
SHA256__doc__, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
SHA256_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
//reinterpret_cast<initproc>(SHA256_init), /* tp_init */
SHA256_init, /* tp_init */
0, /* tp_alloc */
SHA256_new, /* tp_new */
};
void
init_sha256(PyObject* module) {
if (PyType_Ready(&SHA256_type) < 0)
return;
Py_INCREF(&SHA256_type);
PyModule_AddObject(module, "sha256_SHA256", (PyObject *)&SHA256_type);
sha256_error = PyErr_NewException(const_cast<char*>("_sha256.Error"), NULL, NULL);
PyModule_AddObject(module, "sha256_Error", sha256_error);
PyModule_AddStringConstant(module, "sha256___doc__", const_cast<char*>(sha256___doc__));
}
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