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/*
* $Id: ossl_pkey_dh.c,v 1.4 2002/04/07 16:34:43 majkl Exp $
* 'OpenSSL for Ruby' project
* Copyright (C) 2001-2002 Michal Rokos <m.rokos@sh.cvut.cz>
* All rights reserved.
*/
/*
* This program is licenced under the same licence as Ruby.
* (See the file 'LICENCE'.)
*/
#if !defined(NO_DH) && !defined(OPENSSL_NO_DH)
#include "ossl.h"
#include "ossl_pkey.h"
#define MakeDH(obj, dhp) do {\
obj = Data_Make_Struct(cDH, ossl_dh, 0, ossl_dh_free, dhp);\
dhp->pkey.get_EVP_PKEY = ossl_dh_get_EVP_PKEY;\
} while (0)
#define GetDH(obj, dhp) do {\
Data_Get_Struct(obj, ossl_dh, dhp);\
if (!dhp->dh) rb_raise(eDHError, "not initialized!");\
} while (0)
#define DH_PRIVATE(dh) ((dh)->priv_key)
/*
* Classes
*/
VALUE cDH;
VALUE eDHError;
/*
* Struct
*/
typedef struct ossl_dh_st {
ossl_pkey pkey;
DH *dh;
} ossl_dh;
static void
ossl_dh_free(ossl_dh *dhp)
{
if (dhp) {
if (dhp->dh) DH_free(dhp->dh);
dhp->dh = NULL;
free(dhp);
}
}
/*
* Public
*/
VALUE
ossl_dh_new(DH *dh)
{
ossl_dh *dhp = NULL;
DH *new = NULL;
VALUE obj;
if (!dh)
new = DH_new();
else new = DHparams_dup(dh);
if (!new)
OSSL_Raise(eDHError, "");
MakeDH(obj, dhp);
dhp->dh = new;
return obj;
}
DH *
ossl_dh_get_DH(VALUE obj)
{
ossl_dh *dhp = NULL;
DH *dh = NULL;
OSSL_Check_Type(obj, cDH);
GetDH(obj, dhp);
dh = DHparams_dup(dhp->dh);
if (!dh)
OSSL_Raise(eDHError, "");
return dh;
}
EVP_PKEY *
ossl_dh_get_EVP_PKEY(VALUE obj)
{
DH *dh = NULL;
EVP_PKEY *pkey = NULL;
dh = ossl_dh_get_DH(obj);
if (!(pkey = EVP_PKEY_new())) {
DH_free(dh);
OSSL_Raise(eDHError, "");
}
if (!EVP_PKEY_assign_DH(pkey, dh)) { /* NO DUP - don't free! */
DH_free(dh);
EVP_PKEY_free(pkey);
OSSL_Raise(eDHError, "");
}
return pkey;
}
/*
* Private
*/
static VALUE
ossl_dh_s_new_from_pem(VALUE klass, VALUE buffer)
{
ossl_dh *dhp = NULL;
DH *dh = NULL;
BIO *in = NULL;
VALUE obj;
buffer = rb_String(buffer);
if (!(in = BIO_new_mem_buf(RSTRING(buffer)->ptr, RSTRING(buffer)->len)))
OSSL_Raise(eDHError, "");
if (!(dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL))) {
BIO_free(in);
OSSL_Raise(eDHError, "");
}
BIO_free(in);
MakeDH(obj, dhp);
dhp->dh = dh;
return obj;
}
/*
* CB for yielding when generating DH params
*/
static void
ossl_dh_generate_cb(int p, int n, void *arg)
{
VALUE ary;
ary = rb_ary_new2(2);
rb_ary_store(ary, 0, INT2NUM(p));
rb_ary_store(ary, 1, INT2NUM(n));
rb_yield(ary);
}
static VALUE
ossl_dh_s_generate(VALUE klass, VALUE size, VALUE gen)
{
ossl_dh *dhp = NULL;
DH *dh = NULL;
void (*cb)(int, int, void *) = NULL;
VALUE obj;
Check_Type(size, T_FIXNUM);
if (rb_block_given_p())
cb = ossl_dh_generate_cb;
if (!(dh = DH_generate_parameters(FIX2INT(size), FIX2INT(gen), cb, NULL))) { /* arg to cb = NULL */
OSSL_Raise(eDHError, "");
}
if (!DH_generate_key(dh)) {
DH_free(dh);
OSSL_Raise(eDHError, "");
}
MakeDH(obj, dhp);
dhp->dh = dh;
return obj;
}
static VALUE
ossl_dh_is_public(VALUE self)
{
ossl_dh *dhp = NULL;
GetDH(self, dhp);
/*
* Do we need to check dhp->dh->public_pkey?
* return Qtrue;
*/
return (dhp->dh->pub_key) ? Qtrue : Qfalse;
}
static VALUE
ossl_dh_is_private(VALUE self)
{
ossl_dh *dhp = NULL;
GetDH(self, dhp);
return (DH_PRIVATE(dhp->dh)) ? Qtrue : Qfalse;
}
static VALUE
ossl_dh_export(VALUE self)
{
ossl_dh *dhp = NULL;
BIO *out = NULL;
BUF_MEM *buf = NULL;
VALUE str;
GetDH(self, dhp);
if (!(out = BIO_new(BIO_s_mem()))) {
OSSL_Raise(eDHError, "");
}
if (!PEM_write_bio_DHparams(out, dhp->dh)) {
BIO_free(out);
OSSL_Raise(eDHError, "");
}
BIO_get_mem_ptr(out, &buf);
str = rb_str_new(buf->data, buf->length);
BIO_free(out);
return str;
}
/*
* Prints all parameters of key to buffer
* INSECURE: PRIVATE INFORMATIONS CAN LEAK OUT!!!
* Don't use :-)) (I's up to you)
*/
static VALUE
ossl_dh_to_text(VALUE self)
{
ossl_dh *dhp = NULL;
BIO *out = NULL;
BUF_MEM *buf = NULL;
VALUE str;
GetDH(self, dhp);
if (!(out = BIO_new(BIO_s_mem()))) {
OSSL_Raise(eDHError, "");
}
if (!DHparams_print(out, dhp->dh)) {
BIO_free(out);
OSSL_Raise(eDHError, "");
}
BIO_get_mem_ptr(out, &buf);
str = rb_str_new(buf->data, buf->length);
BIO_free(out);
return str;
}
/*
* Makes new instance DH PUBLIC_KEY from PRIVATE_KEY
*/
static VALUE
ossl_dh_to_public_key(VALUE self)
{
ossl_dh *dhp1 = NULL, *dhp2 = NULL;
VALUE obj;
GetDH(self, dhp1);
MakeDH(obj, dhp2);
if (!(dhp2->dh = DHparams_dup(dhp1->dh))) {
OSSL_Raise(eDHError, "");
}
return obj;
}
/*
* INIT
*/
void
Init_ossl_dh(VALUE mPKey, VALUE cPKey, VALUE ePKeyError)
{
eDHError = rb_define_class_under(mPKey, "DHError", ePKeyError);
cDH = rb_define_class_under(mPKey, "DH", cPKey);
rb_define_singleton_method(cDH, "new_from_pem", ossl_dh_s_new_from_pem, 1);
rb_define_singleton_method(cDH, "generate", ossl_dh_s_generate, 2);
rb_define_alias(CLASS_OF(cDH), "new_from_fixnum", "generate");
rb_define_method(cDH, "public?", ossl_dh_is_public, 0);
rb_define_method(cDH, "private?", ossl_dh_is_private, 0);
rb_define_method(cDH, "to_text", ossl_dh_to_text, 0);
rb_define_method(cDH, "export", ossl_dh_export, 0);
rb_define_alias(cDH, "to_pem", "export");
rb_define_method(cDH, "public_key", ossl_dh_to_public_key, 0);
}
#else /* defined NO_DH */
# warning >>> OpenSSL is compiled without DH support <<<
void
Init_ossl_dh(VALUE mPKey, VALUE cPKey, VALUE ePKeyError)
{
rb_warning("OpenSSL is compiled without DH support");
}
#endif /* NO_DH */
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