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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Copyright (c) 2005-2006 Open Source Applications Foundation. All rights reserved. */
/* We are converting between the Python arbitrarily long integer and
* the BIGNUM arbitrarily long integer by converting to and from
* a string representation of the number (in hexadecimal).
* Direct manipulation would be a possibility, but would require
* tighter integration with the Python and OpenSSL internals.
*/
%{
#include <openssl/bn.h>
%}
%inline %{
PyObject *bn_rand(int bits, int top, int bottom)
{
BIGNUM* rnd;
PyObject *ret;
char *randhex;
rnd = BN_new();
if (rnd == NULL) {
m2_PyErr_Msg(PyExc_Exception);
return NULL;
}
if (!BN_rand(rnd, bits, top, bottom)) {
/*Custom errors?*/
m2_PyErr_Msg(PyExc_Exception);
BN_free(rnd);
return NULL;
}
randhex = BN_bn2hex(rnd);
if (!randhex) {
/*Custom errors?*/
m2_PyErr_Msg(PyExc_Exception);
BN_free(rnd);
return NULL;
}
BN_free(rnd);
ret = PyLong_FromString(randhex, NULL, 16);
OPENSSL_free(randhex);
return ret;
}
PyObject *bn_rand_range(PyObject *range)
{
BIGNUM* rnd;
BIGNUM *rng = NULL;
PyObject *ret, *tuple;
PyObject *format, *rangePyString;
char *randhex; /* PyLong_FromString is unhappy with const */
const char *rangehex;
/* Wow, it's a lot of work to convert into a hex string in C! */
format = PyUnicode_FromString("%x");
if (!format) {
PyErr_SetString(PyExc_RuntimeError, "Cannot create Python string '%x'");
return NULL;
}
tuple = PyTuple_New(1);
if (!tuple) {
Py_DECREF(format);
PyErr_SetString(PyExc_RuntimeError, "PyTuple_New() fails");
return NULL;
}
Py_INCREF(range);
PyTuple_SET_ITEM(tuple, 0, range);
rangePyString = PyUnicode_Format(format, tuple);
if (!rangePyString) {
PyErr_SetString(PyExc_Exception, "String Format failed");
Py_DECREF(format);
Py_DECREF(tuple);
return NULL;
}
Py_DECREF(format);
Py_DECREF(tuple);
rangehex = (const char*)PyUnicode_AsUTF8(rangePyString);
if (!BN_hex2bn(&rng, rangehex)) {
/*Custom errors?*/
m2_PyErr_Msg(PyExc_Exception);
Py_DECREF(rangePyString);
return NULL;
}
Py_DECREF(rangePyString);
if (!(rnd = BN_new())) {
PyErr_SetString(PyExc_MemoryError, "bn_rand_range");
return NULL;
}
if (!BN_rand_range(rnd, rng)) {
/*Custom errors?*/
m2_PyErr_Msg(PyExc_Exception);
BN_free(rnd);
BN_free(rng);
return NULL;
}
BN_free(rng);
randhex = BN_bn2hex(rnd);
if (!randhex) {
/*Custom errors?*/
m2_PyErr_Msg(PyExc_Exception);
BN_free(rnd);
return NULL;
}
BN_free(rnd);
ret = PyLong_FromString(randhex, NULL, 16);
OPENSSL_free(randhex);
return ret;
}
%}
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