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/* Copyright (c) 1999 Ng Pheng Siong. All rights reserved. */
/* $Id: _dh.i 695 2009-07-24 06:37:01Z heikki $ */
%{
#include <openssl/bn.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/dh.h>
%}
%apply Pointer NONNULL { DH * };
%rename(dh_new) DH_new;
extern DH *DH_new(void);
%rename(dh_free) DH_free;
extern void DH_free(DH *);
%rename(dh_size) DH_size;
extern int DH_size(const DH *);
%rename(dh_generate_key) DH_generate_key;
extern int DH_generate_key(DH *);
%rename(dhparams_print) DHparams_print;
%threadallow DHparams_print;
extern int DHparams_print(BIO *, const DH *);
%constant int dh_check_ok = 0;
%constant int dh_check_p_not_prime = DH_CHECK_P_NOT_PRIME;
%constant int dh_check_p_not_strong = DH_CHECK_P_NOT_STRONG_PRIME;
%constant int dh_check_g_failed = DH_UNABLE_TO_CHECK_GENERATOR;
%constant int dh_check_bad_g = DH_NOT_SUITABLE_GENERATOR;
%constant DH_GENERATOR_2 = 2;
%constant DH_GENERATOR_5 = 5;
%inline %{
static PyObject *_dh_err;
void dh_init(PyObject *dh_err) {
Py_INCREF(dh_err);
_dh_err = dh_err;
}
int dh_type_check(DH *dh) {
/* Our getting here means we passed Swig's type checking,
XXX Still need to check the pointer for sanity? */
return 1;
}
%}
%threadallow dh_read_parameters;
%inline %{
DH *dh_read_parameters(BIO *bio) {
return PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
}
void gendh_callback(int p, int n, void *arg) {
PyObject *argv, *ret, *cbfunc;
cbfunc = (PyObject *)arg;
argv = Py_BuildValue("(ii)", p, n);
ret = PyEval_CallObject(cbfunc, argv);
PyErr_Clear();
Py_DECREF(argv);
Py_XDECREF(ret);
}
DH *dh_generate_parameters(int plen, int g, PyObject *pyfunc) {
DH *dh;
Py_INCREF(pyfunc);
dh = DH_generate_parameters(plen, g, gendh_callback, (void *)pyfunc);
Py_DECREF(pyfunc);
if (!dh)
PyErr_SetString(_dh_err, ERR_reason_error_string(ERR_get_error()));
return dh;
}
/* Note return value shenanigan. */
int dh_check(DH *dh) {
int err;
return (DH_check(dh, &err)) ? 0 : err;
}
PyObject *dh_compute_key(DH *dh, PyObject *pubkey) {
const void *pkbuf;
int pklen, klen;
void *key;
BIGNUM *pk;
PyObject *ret;
if (m2_PyObject_AsReadBufferInt(pubkey, &pkbuf, &pklen) == -1)
return NULL;
if (!(pk = BN_mpi2bn((unsigned char *)pkbuf, pklen, NULL))) {
PyErr_SetString(_dh_err, ERR_reason_error_string(ERR_get_error()));
return NULL;
}
if (!(key = PyMem_Malloc(DH_size(dh)))) {
BN_free(pk);
PyErr_SetString(PyExc_MemoryError, "dh_compute_key");
return NULL;
}
if ((klen = DH_compute_key((unsigned char *)key, pk, dh)) == -1) {
BN_free(pk);
PyMem_Free(key);
PyErr_SetString(_dh_err, ERR_reason_error_string(ERR_get_error()));
return NULL;
}
ret = PyString_FromStringAndSize((const char *)key, klen);
BN_free(pk);
PyMem_Free(key);
return ret;
}
PyObject *dh_get_p(DH *dh) {
if (!dh->p) {
PyErr_SetString(_dh_err, "'p' is unset");
return NULL;
}
return bn_to_mpi(dh->p);
}
PyObject *dh_get_g(DH *dh) {
if (!dh->g) {
PyErr_SetString(_dh_err, "'g' is unset");
return NULL;
}
return bn_to_mpi(dh->g);
}
PyObject *dh_get_pub(DH *dh) {
if (!dh->pub_key) {
PyErr_SetString(_dh_err, "'pub' is unset");
return NULL;
}
return bn_to_mpi(dh->pub_key);
}
PyObject *dh_get_priv(DH *dh) {
if (!dh->priv_key) {
PyErr_SetString(_dh_err, "'priv' is unset");
return NULL;
}
return bn_to_mpi(dh->priv_key);
}
PyObject *dh_set_p(DH *dh, PyObject *value) {
BIGNUM *bn;
const void *vbuf;
int vlen;
if (m2_PyObject_AsReadBufferInt(value, &vbuf, &vlen) == -1)
return NULL;
if (!(bn = BN_mpi2bn((unsigned char *)vbuf, vlen, NULL))) {
PyErr_SetString(_dh_err, ERR_reason_error_string(ERR_get_error()));
return NULL;
}
if (dh->p)
BN_free(dh->p);
dh->p = bn;
Py_INCREF(Py_None);
return Py_None;
}
PyObject *dh_set_g(DH *dh, PyObject *value) {
BIGNUM *bn;
const void *vbuf;
int vlen;
if (m2_PyObject_AsReadBufferInt(value, &vbuf, &vlen) == -1)
return NULL;
if (!(bn = BN_mpi2bn((unsigned char *)vbuf, vlen, NULL))) {
PyErr_SetString(_dh_err, ERR_reason_error_string(ERR_get_error()));
return NULL;
}
if (dh->g)
BN_free(dh->g);
dh->g = bn;
Py_INCREF(Py_None);
return Py_None;
}
%}
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