105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
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/* tell python that PyArg_ParseTuple(t#) means Py_ssize_t, not int */
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#define PY_SSIZE_T_CLEAN
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#include <Python.h>
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#if (PY_VERSION_HEX < 0x02050000)
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typedef int Py_ssize_t;
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#endif
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/* This is required for compatibility with Python 2. */
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#if PY_MAJOR_VERSION >= 3
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#include <bytesobject.h>
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#define y "y"
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#else
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#define PyBytes_FromStringAndSize PyString_FromStringAndSize
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#define y "t"
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#endif
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int curve25519_donna(char *mypublic,
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const char *secret, const char *basepoint);
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static PyObject *
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pycurve25519_makeprivate(PyObject *self, PyObject *args)
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{
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char *in1;
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Py_ssize_t in1len;
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if (!PyArg_ParseTuple(args, y"#:clamp", &in1, &in1len))
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return NULL;
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if (in1len != 32) {
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PyErr_SetString(PyExc_ValueError, "input must be 32-byte string");
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return NULL;
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}
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in1[0] &= 248;
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in1[31] &= 127;
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in1[31] |= 64;
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return PyBytes_FromStringAndSize((char *)in1, 32);
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}
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static PyObject *
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pycurve25519_makepublic(PyObject *self, PyObject *args)
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{
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const char *private;
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char mypublic[32];
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char basepoint[32] = {9};
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Py_ssize_t privatelen;
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if (!PyArg_ParseTuple(args, y"#:makepublic", &private, &privatelen))
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return NULL;
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if (privatelen != 32) {
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PyErr_SetString(PyExc_ValueError, "input must be 32-byte string");
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return NULL;
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}
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curve25519_donna(mypublic, private, basepoint);
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return PyBytes_FromStringAndSize((char *)mypublic, 32);
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}
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static PyObject *
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pycurve25519_makeshared(PyObject *self, PyObject *args)
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{
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const char *myprivate, *theirpublic;
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char shared_key[32];
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Py_ssize_t myprivatelen, theirpubliclen;
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if (!PyArg_ParseTuple(args, y"#"y"#:generate",
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&myprivate, &myprivatelen, &theirpublic, &theirpubliclen))
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return NULL;
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if (myprivatelen != 32) {
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PyErr_SetString(PyExc_ValueError, "input must be 32-byte string");
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return NULL;
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}
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if (theirpubliclen != 32) {
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PyErr_SetString(PyExc_ValueError, "input must be 32-byte string");
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return NULL;
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}
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curve25519_donna(shared_key, myprivate, theirpublic);
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return PyBytes_FromStringAndSize((char *)shared_key, 32);
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}
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static PyMethodDef
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curve25519_functions[] = {
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{"make_private", pycurve25519_makeprivate, METH_VARARGS, "data->private"},
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{"make_public", pycurve25519_makepublic, METH_VARARGS, "private->public"},
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{"make_shared", pycurve25519_makeshared, METH_VARARGS, "private+public->shared"},
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{NULL, NULL, 0, NULL},
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};
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#if PY_MAJOR_VERSION >= 3
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static struct PyModuleDef
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curve25519_module = {
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PyModuleDef_HEAD_INIT,
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"_curve25519",
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NULL,
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NULL,
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curve25519_functions,
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};
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PyObject *
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PyInit__curve25519(void)
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{
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return PyModule_Create(&curve25519_module);
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}
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#else
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PyMODINIT_FUNC
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init_curve25519(void)
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{
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(void)Py_InitModule("_curve25519", curve25519_functions);
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}
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#endif
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