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ruby--ruby/ext/openssl/ossl_pkey_dh.c

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/*
* $Id$
* '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(OPENSSL_NO_DH)
#include "ossl.h"
#define GetPKeyDH(obj, pkey) do { \
GetPKey(obj, pkey); \
if (EVP_PKEY_type(pkey->type) != EVP_PKEY_DH) { /* PARANOIA? */ \
ossl_raise(rb_eRuntimeError, "THIS IS NOT A DH!") ; \
} \
} while (0)
#define DH_PRIVATE(dh) ((dh)->priv_key)
/*
* Classes
*/
VALUE cDH;
VALUE eDHError;
/*
* Public
*/
static VALUE
dh_instance(VALUE klass, DH *dh)
{
EVP_PKEY *pkey;
VALUE obj;
if (!dh) {
return Qfalse;
}
if (!(pkey = EVP_PKEY_new())) {
return Qfalse;
}
if (!EVP_PKEY_assign_DH(pkey, dh)) {
EVP_PKEY_free(pkey);
return Qfalse;
}
WrapPKey(klass, obj, pkey);
return obj;
}
VALUE
ossl_dh_new(EVP_PKEY *pkey)
{
VALUE obj;
if (!pkey) {
obj = dh_instance(cDH, DH_new());
} else {
if (EVP_PKEY_type(pkey->type) != EVP_PKEY_DH) {
ossl_raise(rb_eTypeError, "Not a DH key!");
}
WrapPKey(cDH, obj, pkey);
}
if (obj == Qfalse) {
ossl_raise(eDHError, NULL);
}
return obj;
}
/*
* Private
*/
/*
* 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 DH *
dh_generate(int size, int gen)
{
DH *dh;
void (*cb)(int, int, void *) = NULL;
if (rb_block_given_p()) {
cb = ossl_dh_generate_cb;
}
/* arg to cb = NULL */
if (!(dh = DH_generate_parameters(size, gen, cb, NULL))) {
return 0;
}
if (!DH_generate_key(dh)) {
DH_free(dh);
return 0;
}
return dh;
}
static VALUE
ossl_dh_s_generate(int argc, VALUE *argv, VALUE klass)
{
DH *dh ;
int g = 2;
VALUE size, gen, obj;
if (rb_scan_args(argc, argv, "11", &size, &gen) == 2) {
g = FIX2INT(gen);
}
dh = dh_generate(FIX2INT(size), g);
obj = dh_instance(klass, dh);
if (obj == Qfalse) {
DH_free(dh);
ossl_raise(eDHError, NULL);
}
return obj;
}
static VALUE
ossl_dh_initialize(int argc, VALUE *argv, VALUE self)
{
EVP_PKEY *pkey;
DH *dh;
int g = 2;
BIO *in;
VALUE buffer, gen;
GetPKey(self, pkey);
rb_scan_args(argc, argv, "11", &buffer, &gen);
if (FIXNUM_P(buffer)) {
if (!NIL_P(gen)) {
g = FIX2INT(gen);
}
if (!(dh = dh_generate(FIX2INT(buffer), g))) {
ossl_raise(eDHError, NULL);
}
} else {
StringValue(buffer);
in = BIO_new_mem_buf(RSTRING(buffer)->ptr, RSTRING(buffer)->len);
if (!in){
ossl_raise(eDHError, NULL);
}
if (!(dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL))) {
BIO_free(in);
ossl_raise(eDHError, NULL);
}
BIO_free(in);
}
if (!EVP_PKEY_assign_DH(pkey, dh)) {
DH_free(dh);
ossl_raise(eRSAError, NULL);
}
return self;
}
static VALUE
ossl_dh_is_public(VALUE self)
{
EVP_PKEY *pkey;
GetPKeyDH(self, pkey);
/*
* Do we need to check dhp->dh->public_pkey?
* return Qtrue;
*/
return (pkey->pkey.dh->pub_key) ? Qtrue : Qfalse;
}
static VALUE
ossl_dh_is_private(VALUE self)
{
EVP_PKEY *pkey;
GetPKeyDH(self, pkey);
return (DH_PRIVATE(pkey->pkey.dh)) ? Qtrue : Qfalse;
}
static VALUE
ossl_dh_export(VALUE self)
{
EVP_PKEY *pkey;
BIO *out;
BUF_MEM *buf;
VALUE str;
GetPKeyDH(self, pkey);
if (!(out = BIO_new(BIO_s_mem()))) {
ossl_raise(eDHError, NULL);
}
if (!PEM_write_bio_DHparams(out, pkey->pkey.dh)) {
BIO_free(out);
ossl_raise(eDHError, NULL);
}
BIO_get_mem_ptr(out, &buf);
str = rb_str_new(buf->data, buf->length);
BIO_free(out);
return str;
}
/*
* Stores all parameters of key to the hash
* INSECURE: PRIVATE INFORMATIONS CAN LEAK OUT!!!
* Don't use :-)) (I's up to you)
*/
static VALUE
ossl_dh_get_params(VALUE self)
{
EVP_PKEY *pkey;
VALUE hash;
GetPKeyDH(self, pkey);
hash = rb_hash_new();
rb_hash_aset(hash, rb_str_new2("p"), ossl_bn_new(pkey->pkey.dh->p));
rb_hash_aset(hash, rb_str_new2("g"), ossl_bn_new(pkey->pkey.dh->g));
rb_hash_aset(hash, rb_str_new2("pub_key"), ossl_bn_new(pkey->pkey.dh->pub_key));
rb_hash_aset(hash, rb_str_new2("priv_key"), ossl_bn_new(pkey->pkey.dh->priv_key));
return hash;
}
/*
* 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)
{
EVP_PKEY *pkey;
BIO *out;
BUF_MEM *buf;
VALUE str;
GetPKeyDH(self, pkey);
if (!(out = BIO_new(BIO_s_mem()))) {
ossl_raise(eDHError, NULL);
}
if (!DHparams_print(out, pkey->pkey.dh)) {
BIO_free(out);
ossl_raise(eDHError, NULL);
}
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)
{
EVP_PKEY *pkey;
DH *dh;
VALUE obj;
GetPKeyDH(self, pkey);
dh = DHparams_dup(pkey->pkey.dh); /* err check perfomed by dh_instance */
obj = dh_instance(CLASS_OF(self), dh);
if (obj == Qfalse) {
DH_free(dh);
ossl_raise(eDHError, NULL);
}
return obj;
}
static VALUE
ossl_dh_check_params(VALUE self)
{
DH *dh;
EVP_PKEY *pkey;
int codes;
GetPKeyDH(self, pkey);
dh = pkey->pkey.dh;
if (!DH_check(dh, &codes)) {
return Qfalse;
}
return codes == 0 ? Qtrue : Qfalse;
}
static VALUE
ossl_dh_generate_key(VALUE self)
{
DH *dh;
EVP_PKEY *pkey;
GetPKeyDH(self, pkey);
dh = pkey->pkey.dh;
if (!DH_generate_key(dh))
ossl_raise(eDHError, "Failed to generate key");
return self;
}
static VALUE
ossl_dh_compute_key(VALUE self, VALUE pub)
{
DH *dh;
EVP_PKEY *pkey;
BIGNUM *pub_key;
VALUE str;
int len;
char *buf;
GetPKeyDH(self, pkey);
dh = pkey->pkey.dh;
pub_key = GetBNPtr(pub);
len = DH_size(dh);
if (!(buf = OPENSSL_malloc(len))) {
ossl_raise(eDHError, "Cannot allocate mem for shared secret");
}
if ((len = DH_compute_key(buf, pub_key, dh)) < 0) {
OPENSSL_free(buf);
ossl_raise(eDHError, NULL);
}
str = rb_str_new(buf, len);
OPENSSL_free(buf);
return str;
}
/*
* INIT
*/
void
Init_ossl_dh()
{
eDHError = rb_define_class_under(mPKey, "DHError", ePKeyError);
cDH = rb_define_class_under(mPKey, "DH", cPKey);
rb_define_singleton_method(cDH, "generate", ossl_dh_s_generate, -1);
rb_define_method(cDH, "initialize", ossl_dh_initialize, -1);
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_alias(cDH, "to_s", "export");
rb_define_method(cDH, "public_key", ossl_dh_to_public_key, 0);
rb_define_method(cDH, "params_ok?", ossl_dh_check_params, 0);
rb_define_method(cDH, "generate_key!", ossl_dh_generate_key, 0);
rb_define_method(cDH, "compute_key", ossl_dh_compute_key, 1);
rb_define_method(cDH, "params", ossl_dh_get_params, 0);
}
#else /* defined NO_DH */
# warning >>> OpenSSL is compiled without DH support <<<
void
Init_ossl_dh()
{
rb_warning("OpenSSL is compiled without DH support");
}
#endif /* NO_DH */
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