384 lines
7.4 KiB
C
384 lines
7.4 KiB
C
/*
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* $Id$
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* 'OpenSSL for Ruby' project
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* Copyright (C) 2001-2002 Michal Rokos <m.rokos@sh.cvut.cz>
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* All rights reserved.
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*/
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/*
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* This program is licenced under the same licence as Ruby.
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* (See the file 'LICENCE'.)
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*/
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#if !defined(OPENSSL_NO_DH)
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#include "ossl.h"
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#define GetPKeyDH(obj, pkey) do { \
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GetPKey(obj, pkey); \
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if (EVP_PKEY_type(pkey->type) != EVP_PKEY_DH) { /* PARANOIA? */ \
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ossl_raise(rb_eRuntimeError, "THIS IS NOT A DH!") ; \
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} \
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} while (0)
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#define DH_HAS_PRIVATE(dh) ((dh)->priv_key)
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#ifdef OSSL_ENGINE_ENABLED
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# define DH_PRIVATE(dh) (DH_HAS_PRIVATE(dh) || (dh)->engine)
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#else
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# define DH_PRIVATE(dh) DH_HAS_PRIVATE(dh)
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#endif
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/*
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* Classes
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*/
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VALUE cDH;
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VALUE eDHError;
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/*
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* Public
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*/
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static VALUE
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dh_instance(VALUE klass, DH *dh)
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{
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EVP_PKEY *pkey;
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VALUE obj;
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if (!dh) {
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return Qfalse;
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}
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if (!(pkey = EVP_PKEY_new())) {
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return Qfalse;
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}
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if (!EVP_PKEY_assign_DH(pkey, dh)) {
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EVP_PKEY_free(pkey);
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return Qfalse;
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}
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WrapPKey(klass, obj, pkey);
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return obj;
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}
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VALUE
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ossl_dh_new(EVP_PKEY *pkey)
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{
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VALUE obj;
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if (!pkey) {
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obj = dh_instance(cDH, DH_new());
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} else {
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if (EVP_PKEY_type(pkey->type) != EVP_PKEY_DH) {
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ossl_raise(rb_eTypeError, "Not a DH key!");
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}
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WrapPKey(cDH, obj, pkey);
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}
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if (obj == Qfalse) {
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ossl_raise(eDHError, NULL);
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}
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return obj;
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}
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/*
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* Private
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*/
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static DH *
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dh_generate(int size, int gen)
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{
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DH *dh;
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dh = DH_generate_parameters(size, gen,
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rb_block_given_p() ? ossl_generate_cb : NULL,
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NULL);
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if (!dh) return 0;
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if (!DH_generate_key(dh)) {
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DH_free(dh);
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return 0;
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}
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return dh;
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}
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static VALUE
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ossl_dh_s_generate(int argc, VALUE *argv, VALUE klass)
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{
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DH *dh ;
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int g = 2;
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VALUE size, gen, obj;
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if (rb_scan_args(argc, argv, "11", &size, &gen) == 2) {
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g = FIX2INT(gen);
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}
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dh = dh_generate(FIX2INT(size), g);
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obj = dh_instance(klass, dh);
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if (obj == Qfalse) {
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DH_free(dh);
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ossl_raise(eDHError, NULL);
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}
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return obj;
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}
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static VALUE
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ossl_dh_initialize(int argc, VALUE *argv, VALUE self)
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{
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EVP_PKEY *pkey;
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DH *dh;
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int g = 2;
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BIO *in;
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VALUE arg, gen;
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GetPKey(self, pkey);
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rb_scan_args(argc, argv, "11", &arg, &gen);
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if (FIXNUM_P(arg)) {
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if (!NIL_P(gen)) {
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g = FIX2INT(gen);
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}
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if (!(dh = dh_generate(FIX2INT(arg), g))) {
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ossl_raise(eDHError, NULL);
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}
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}
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else {
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arg = ossl_to_der_if_possible(arg);
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in = ossl_obj2bio(arg);
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dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
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if (!dh){
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BIO_reset(in);
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dh = d2i_DHparams_bio(in, NULL);
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}
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BIO_free(in);
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if (!dh) ossl_raise(eDHError, NULL);
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}
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if (!EVP_PKEY_assign_DH(pkey, dh)) {
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DH_free(dh);
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ossl_raise(eRSAError, NULL);
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}
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return self;
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}
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static VALUE
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ossl_dh_is_public(VALUE self)
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{
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EVP_PKEY *pkey;
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GetPKeyDH(self, pkey);
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/*
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* Do we need to check dhp->dh->public_pkey?
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* return Qtrue;
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*/
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return (pkey->pkey.dh->pub_key) ? Qtrue : Qfalse;
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}
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static VALUE
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ossl_dh_is_private(VALUE self)
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{
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EVP_PKEY *pkey;
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GetPKeyDH(self, pkey);
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return (DH_PRIVATE(pkey->pkey.dh)) ? Qtrue : Qfalse;
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}
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static VALUE
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ossl_dh_export(VALUE self)
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{
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EVP_PKEY *pkey;
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BIO *out;
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VALUE str;
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GetPKeyDH(self, pkey);
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if (!(out = BIO_new(BIO_s_mem()))) {
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ossl_raise(eDHError, NULL);
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}
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if (!PEM_write_bio_DHparams(out, pkey->pkey.dh)) {
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BIO_free(out);
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ossl_raise(eDHError, NULL);
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}
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str = ossl_membio2str(out);
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return str;
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}
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static VALUE
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ossl_dh_to_der(VALUE self)
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{
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EVP_PKEY *pkey;
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unsigned char *p;
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long len;
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VALUE str;
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GetPKeyDH(self, pkey);
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if((len = i2d_DHparams(pkey->pkey.dh, NULL)) <= 0)
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ossl_raise(eDHError, NULL);
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str = rb_str_new(0, len);
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p = RSTRING(str)->ptr;
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if(i2d_DHparams(pkey->pkey.dh, &p) < 0)
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ossl_raise(eDHError, NULL);
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ossl_str_adjust(str, p);
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return str;
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}
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/*
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* Stores all parameters of key to the hash
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* INSECURE: PRIVATE INFORMATIONS CAN LEAK OUT!!!
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* Don't use :-)) (I's up to you)
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*/
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static VALUE
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ossl_dh_get_params(VALUE self)
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{
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EVP_PKEY *pkey;
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VALUE hash;
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GetPKeyDH(self, pkey);
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hash = rb_hash_new();
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rb_hash_aset(hash, rb_str_new2("p"), ossl_bn_new(pkey->pkey.dh->p));
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rb_hash_aset(hash, rb_str_new2("g"), ossl_bn_new(pkey->pkey.dh->g));
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rb_hash_aset(hash, rb_str_new2("pub_key"), ossl_bn_new(pkey->pkey.dh->pub_key));
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rb_hash_aset(hash, rb_str_new2("priv_key"), ossl_bn_new(pkey->pkey.dh->priv_key));
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return hash;
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}
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/*
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* Prints all parameters of key to buffer
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* INSECURE: PRIVATE INFORMATIONS CAN LEAK OUT!!!
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* Don't use :-)) (I's up to you)
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*/
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static VALUE
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ossl_dh_to_text(VALUE self)
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{
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EVP_PKEY *pkey;
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BIO *out;
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VALUE str;
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GetPKeyDH(self, pkey);
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if (!(out = BIO_new(BIO_s_mem()))) {
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ossl_raise(eDHError, NULL);
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}
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if (!DHparams_print(out, pkey->pkey.dh)) {
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BIO_free(out);
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ossl_raise(eDHError, NULL);
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}
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str = ossl_membio2str(out);
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return str;
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}
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/*
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* Makes new instance DH PUBLIC_KEY from PRIVATE_KEY
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*/
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static VALUE
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ossl_dh_to_public_key(VALUE self)
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{
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EVP_PKEY *pkey;
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DH *dh;
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VALUE obj;
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GetPKeyDH(self, pkey);
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dh = DHparams_dup(pkey->pkey.dh); /* err check perfomed by dh_instance */
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obj = dh_instance(CLASS_OF(self), dh);
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if (obj == Qfalse) {
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DH_free(dh);
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ossl_raise(eDHError, NULL);
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}
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return obj;
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}
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static VALUE
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ossl_dh_check_params(VALUE self)
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{
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DH *dh;
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EVP_PKEY *pkey;
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int codes;
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GetPKeyDH(self, pkey);
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dh = pkey->pkey.dh;
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if (!DH_check(dh, &codes)) {
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return Qfalse;
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}
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return codes == 0 ? Qtrue : Qfalse;
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}
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static VALUE
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ossl_dh_generate_key(VALUE self)
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{
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DH *dh;
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EVP_PKEY *pkey;
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GetPKeyDH(self, pkey);
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dh = pkey->pkey.dh;
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if (!DH_generate_key(dh))
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ossl_raise(eDHError, "Failed to generate key");
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return self;
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}
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static VALUE
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ossl_dh_compute_key(VALUE self, VALUE pub)
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{
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DH *dh;
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EVP_PKEY *pkey;
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BIGNUM *pub_key;
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VALUE str;
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int len;
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GetPKeyDH(self, pkey);
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dh = pkey->pkey.dh;
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pub_key = GetBNPtr(pub);
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len = DH_size(dh);
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str = rb_str_new(0, len);
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if ((len = DH_compute_key(RSTRING(str)->ptr, pub_key, dh)) < 0) {
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ossl_raise(eDHError, NULL);
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}
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RSTRING(str)->len = len;
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RSTRING(str)->ptr[len] = 0;
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return str;
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}
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/*
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* INIT
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*/
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void
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Init_ossl_dh()
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{
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eDHError = rb_define_class_under(mPKey, "DHError", ePKeyError);
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cDH = rb_define_class_under(mPKey, "DH", cPKey);
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rb_define_singleton_method(cDH, "generate", ossl_dh_s_generate, -1);
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rb_define_method(cDH, "initialize", ossl_dh_initialize, -1);
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rb_define_method(cDH, "public?", ossl_dh_is_public, 0);
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rb_define_method(cDH, "private?", ossl_dh_is_private, 0);
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rb_define_method(cDH, "to_text", ossl_dh_to_text, 0);
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rb_define_method(cDH, "export", ossl_dh_export, 0);
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rb_define_alias(cDH, "to_pem", "export");
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rb_define_alias(cDH, "to_s", "export");
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rb_define_method(cDH, "to_der", ossl_dh_to_der, 0);
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rb_define_method(cDH, "public_key", ossl_dh_to_public_key, 0);
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rb_define_method(cDH, "params_ok?", ossl_dh_check_params, 0);
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rb_define_method(cDH, "generate_key!", ossl_dh_generate_key, 0);
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rb_define_method(cDH, "compute_key", ossl_dh_compute_key, 1);
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rb_define_method(cDH, "params", ossl_dh_get_params, 0);
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}
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#else /* defined NO_DH */
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# warning >>> OpenSSL is compiled without DH support <<<
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void
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Init_ossl_dh()
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{
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rb_warning("OpenSSL is compiled without DH support");
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}
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#endif /* NO_DH */
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