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/* Copyright (c) 1999 Ng Pheng Siong. All rights reserved. */
/* $Id$ */
%{
#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;
%warnfilter(454) _dh_err;
%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);
}
DH *dh_generate_parameters(int plen, int g, PyObject *pyfunc) {
DH *dh;
BN_GENCB *gencb;
int ret;
if ((gencb=BN_GENCB_new()) == NULL) {
m2_PyErr_Msg(_dh_err);
return NULL;
}
if ((dh=DH_new()) == NULL) {
m2_PyErr_Msg(_dh_err);
BN_GENCB_free(gencb);
return NULL;
}
BN_GENCB_set(gencb, bn_gencb_callback, (void *)pyfunc);
Py_INCREF(pyfunc);
ret = DH_generate_parameters_ex(dh, plen, g, gencb);
Py_DECREF(pyfunc);
BN_GENCB_free(gencb);
if (ret)
return dh;
m2_PyErr_Msg(_dh_err);
DH_free(dh);
return NULL;
}
/* 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 = 0, 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))) {
m2_PyErr_Msg(_dh_err);
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);
m2_PyErr_Msg(_dh_err);
return NULL;
}
ret = PyBytes_FromStringAndSize((const char *)key, klen);
BN_free(pk);
PyMem_Free(key);
return ret;
}
PyObject *dh_get_p(DH *dh) {
const BIGNUM* p = NULL;
DH_get0_pqg(dh, &p, NULL, NULL);
if (!p) {
PyErr_SetString(_dh_err, "'p' is unset");
return NULL;
}
return bn_to_mpi(p);
}
PyObject *dh_get_g(DH *dh) {
const BIGNUM* g = NULL;
DH_get0_pqg(dh, NULL, NULL, &g);
if (!g) {
PyErr_SetString(_dh_err, "'g' is unset");
return NULL;
}
return bn_to_mpi(g);
}
PyObject *dh_get_pub(DH *dh) {
const BIGNUM* pub_key = NULL;
DH_get0_key(dh, &pub_key, NULL);
if (!pub_key) {
PyErr_SetString(_dh_err, "'pub' is unset");
return NULL;
}
return bn_to_mpi(pub_key);
}
PyObject *dh_get_priv(DH *dh) {
const BIGNUM* priv_key = NULL;
DH_get0_key(dh, NULL, &priv_key);
if (!priv_key) {
PyErr_SetString(_dh_err, "'priv' is unset");
return NULL;
}
return bn_to_mpi(priv_key);
}
PyObject *dh_set_pg(DH *dh, PyObject *pval, PyObject* gval) {
BIGNUM* p, *g;
if (!(p = m2_PyObject_AsBIGNUM(pval, _dh_err))
|| !(g = m2_PyObject_AsBIGNUM(gval, _dh_err)))
return NULL;
if (!DH_set0_pqg(dh, p, NULL, g)) {
PyErr_SetString(_dh_err,
"Cannot set prime number or generator of Z_p for DH.");
BN_free(p);
BN_free(g);
return NULL;
}
Py_RETURN_NONE;
}
%}
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