558 lines
12 KiB
C
558 lines
12 KiB
C
/* $OpenBSD: dh_ameth.c,v 1.39 2023/08/12 07:59:48 tb Exp $ */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2006.
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*/
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/* ====================================================================
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* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include <openssl/asn1.h>
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#include <openssl/bn.h>
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#include <openssl/dh.h>
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#include <openssl/err.h>
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#include <openssl/x509.h>
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#include "asn1_local.h"
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#include "bn_local.h"
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#include "dh_local.h"
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#include "evp_local.h"
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static void
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dh_free(EVP_PKEY *pkey)
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{
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DH_free(pkey->pkey.dh);
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}
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static int
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dh_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
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{
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X509_ALGOR *algor;
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int ptype;
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const void *pval;
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const ASN1_STRING *astr;
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const unsigned char *key, *params, *p;
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int key_len, params_len;
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ASN1_INTEGER *aint = NULL;
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DH *dh = NULL;
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int ret = 0;
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if (!X509_PUBKEY_get0_param(NULL, &key, &key_len, &algor, pubkey))
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goto err;
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X509_ALGOR_get0(NULL, &ptype, &pval, algor);
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if (ptype != V_ASN1_SEQUENCE) {
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DHerror(DH_R_PARAMETER_ENCODING_ERROR);
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goto err;
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}
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astr = pval;
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params = astr->data;
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params_len = astr->length;
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p = params;
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if ((dh = d2i_DHparams(NULL, &p, params_len)) == NULL) {
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DHerror(DH_R_DECODE_ERROR);
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goto err;
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}
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p = key;
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if ((aint = d2i_ASN1_INTEGER(NULL, &p, key_len)) == NULL) {
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DHerror(DH_R_DECODE_ERROR);
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goto err;
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}
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BN_free(dh->pub_key);
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if ((dh->pub_key = ASN1_INTEGER_to_BN(aint, NULL)) == NULL) {
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DHerror(DH_R_BN_DECODE_ERROR);
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goto err;
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}
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if (!EVP_PKEY_assign_DH(pkey, dh))
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goto err;
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dh = NULL;
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ret = 1;
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err:
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ASN1_INTEGER_free(aint);
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DH_free(dh);
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return ret;
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}
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static int
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dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
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{
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const DH *dh = pkey->pkey.dh;
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ASN1_STRING *astr = NULL;
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int ptype = V_ASN1_SEQUENCE;
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ASN1_INTEGER *aint = NULL;
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ASN1_OBJECT *aobj;
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unsigned char *params = NULL, *key = NULL;
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int params_len = 0, key_len = 0;
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int ret = 0;
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if ((params_len = i2d_DHparams(dh, ¶ms)) <= 0) {
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DHerror(ERR_R_MALLOC_FAILURE);
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params_len = 0;
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goto err;
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}
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if ((astr = ASN1_STRING_new()) == NULL) {
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DHerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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ASN1_STRING_set0(astr, params, params_len);
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params = NULL;
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params_len = 0;
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if ((aint = BN_to_ASN1_INTEGER(dh->pub_key, NULL)) == NULL)
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goto err;
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if ((key_len = i2d_ASN1_INTEGER(aint, &key)) <= 0) {
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DHerror(ERR_R_MALLOC_FAILURE);
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key_len = 0;
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goto err;
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}
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if ((aobj = OBJ_nid2obj(EVP_PKEY_DH)) == NULL)
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goto err;
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if (!X509_PUBKEY_set0_param(pk, aobj, ptype, astr, key, key_len))
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goto err;
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astr = NULL;
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key = NULL;
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key_len = 0;
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ret = 1;
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err:
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ASN1_STRING_free(astr);
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ASN1_INTEGER_free(aint);
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freezero(params, params_len);
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freezero(key, key_len);
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return ret;
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}
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/*
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* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in
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* that the AlgorithmIdentifier contains the parameters, the private key
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* is explcitly included and the pubkey must be recalculated.
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*/
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static int
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dh_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
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{
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const X509_ALGOR *algor;
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int ptype;
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const void *pval;
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const ASN1_STRING *astr;
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const unsigned char *key, *params, *p;
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int key_len, params_len;
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ASN1_INTEGER *aint = NULL;
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DH *dh = NULL;
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int ret = 0;
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if (!PKCS8_pkey_get0(NULL, &key, &key_len, &algor, p8))
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goto err;
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X509_ALGOR_get0(NULL, &ptype, &pval, algor);
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if (ptype != V_ASN1_SEQUENCE) {
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DHerror(DH_R_PARAMETER_ENCODING_ERROR);
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goto err;
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}
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astr = pval;
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params = astr->data;
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params_len = astr->length;
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p = params;
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if ((dh = d2i_DHparams(NULL, &p, params_len)) == NULL) {
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DHerror(DH_R_DECODE_ERROR);
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goto err;
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}
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p = key;
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if ((aint = d2i_ASN1_INTEGER(NULL, &p, key_len)) == NULL) {
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DHerror(DH_R_DECODE_ERROR);
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goto err;
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}
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BN_free(dh->priv_key);
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if ((dh->priv_key = ASN1_INTEGER_to_BN(aint, NULL)) == NULL) {
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DHerror(DH_R_BN_DECODE_ERROR);
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goto err;
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}
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if (!DH_generate_key(dh))
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goto err;
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if (!EVP_PKEY_assign_DH(pkey, dh))
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goto err;
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dh = NULL;
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ret = 1;
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err:
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ASN1_INTEGER_free(aint);
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DH_free(dh);
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return ret;
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}
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static int
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dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
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{
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const DH *dh = pkey->pkey.dh;
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ASN1_STRING *astr = NULL;
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int ptype = V_ASN1_SEQUENCE;
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ASN1_INTEGER *aint = NULL;
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ASN1_OBJECT *aobj;
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unsigned char *params = NULL, *key = NULL;
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int params_len = 0, key_len = 0;
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int ret = 0;
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if ((params_len = i2d_DHparams(dh, ¶ms)) <= 0) {
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DHerror(ERR_R_MALLOC_FAILURE);
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params_len = 0;
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goto err;
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}
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if ((astr = ASN1_STRING_type_new(V_ASN1_SEQUENCE)) == NULL) {
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DHerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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ASN1_STRING_set0(astr, params, params_len);
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params = NULL;
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params_len = 0;
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if ((aint = BN_to_ASN1_INTEGER(dh->priv_key, NULL)) == NULL) {
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DHerror(DH_R_BN_ERROR);
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goto err;
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}
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if ((key_len = i2d_ASN1_INTEGER(aint, &key)) <= 0) {
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DHerror(ERR_R_MALLOC_FAILURE);
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key_len = 0;
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goto err;
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}
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if ((aobj = OBJ_nid2obj(NID_dhKeyAgreement)) == NULL)
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goto err;
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if (!PKCS8_pkey_set0(p8, aobj, 0, ptype, astr, key, key_len))
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goto err;
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astr = NULL;
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key = NULL;
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key_len = 0;
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ret = 1;
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err:
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ASN1_STRING_free(astr);
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ASN1_INTEGER_free(aint);
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freezero(params, params_len);
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freezero(key, key_len);
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return ret;
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}
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static int
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dh_param_decode(EVP_PKEY *pkey, const unsigned char **params, int params_len)
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{
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DH *dh = NULL;
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int ret = 0;
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if ((dh = d2i_DHparams(NULL, params, params_len)) == NULL) {
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DHerror(ERR_R_DH_LIB);
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goto err;
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}
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if (!EVP_PKEY_assign_DH(pkey, dh))
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goto err;
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dh = NULL;
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ret = 1;
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err:
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DH_free(dh);
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return ret;
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}
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static int
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dh_param_encode(const EVP_PKEY *pkey, unsigned char **params)
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{
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return i2d_DHparams(pkey->pkey.dh, params);
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}
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static int
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do_dh_print(BIO *bp, const DH *x, int indent, ASN1_PCTX *ctx, int ptype)
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{
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int reason = ERR_R_BUF_LIB, ret = 0;
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const char *ktype = NULL;
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BIGNUM *priv_key, *pub_key;
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if (ptype == 2)
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priv_key = x->priv_key;
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else
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priv_key = NULL;
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if (ptype > 0)
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pub_key = x->pub_key;
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else
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pub_key = NULL;
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if (ptype == 2)
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ktype = "PKCS#3 DH Private-Key";
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else if (ptype == 1)
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ktype = "PKCS#3 DH Public-Key";
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else
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ktype = "PKCS#3 DH Parameters";
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if (x->p == NULL) {
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reason = ERR_R_PASSED_NULL_PARAMETER;
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goto err;
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}
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if (!BIO_indent(bp, indent, 128))
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goto err;
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if (BIO_printf(bp, "%s: (%d bit)\n", ktype, BN_num_bits(x->p)) <= 0)
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goto err;
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indent += 4;
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if (!bn_printf(bp, priv_key, indent, "private-key:"))
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goto err;
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if (!bn_printf(bp, pub_key, indent, "public-key:"))
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goto err;
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if (!bn_printf(bp, x->p, indent, "prime:"))
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goto err;
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if (!bn_printf(bp, x->g, indent, "generator:"))
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goto err;
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if (x->length != 0) {
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if (!BIO_indent(bp, indent, 128))
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goto err;
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if (BIO_printf(bp, "recommended-private-length: %d bits\n",
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(int)x->length) <= 0)
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goto err;
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}
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ret = 1;
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if (0) {
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err:
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DHerror(reason);
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}
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return(ret);
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}
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static int
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dh_size(const EVP_PKEY *pkey)
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{
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return DH_size(pkey->pkey.dh);
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}
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static int
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dh_bits(const EVP_PKEY *pkey)
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{
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return BN_num_bits(pkey->pkey.dh->p);
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}
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static int
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dh_security_bits(const EVP_PKEY *pkey)
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{
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return DH_security_bits(pkey->pkey.dh);
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}
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static int
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dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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if (BN_cmp(a->pkey.dh->p, b->pkey.dh->p) ||
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BN_cmp(a->pkey.dh->g, b->pkey.dh->g))
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return 0;
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else
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return 1;
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}
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static int
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dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
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{
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BIGNUM *a;
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if ((a = BN_dup(from->pkey.dh->p)) == NULL)
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return 0;
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BN_free(to->pkey.dh->p);
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to->pkey.dh->p = a;
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if ((a = BN_dup(from->pkey.dh->g)) == NULL)
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return 0;
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BN_free(to->pkey.dh->g);
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to->pkey.dh->g = a;
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return 1;
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}
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static int
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dh_missing_parameters(const EVP_PKEY *pkey)
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{
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const DH *dh = pkey->pkey.dh;
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return dh->p == NULL || dh->g == NULL;
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}
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static int
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dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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if (dh_cmp_parameters(a, b) == 0)
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return 0;
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if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
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return 0;
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else
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return 1;
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}
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static int
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dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
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{
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return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 0);
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}
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static int
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dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
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{
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return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 1);
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}
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static int
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dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent, ASN1_PCTX *ctx)
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{
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return do_dh_print(bp, pkey->pkey.dh, indent, ctx, 2);
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}
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int
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DHparams_print(BIO *bp, const DH *x)
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{
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return do_dh_print(bp, x, 4, NULL, 0);
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}
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LCRYPTO_ALIAS(DHparams_print);
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int
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DHparams_print_fp(FILE *fp, const DH *x)
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{
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BIO *b;
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int ret;
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if ((b = BIO_new(BIO_s_file())) == NULL) {
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DHerror(ERR_R_BUF_LIB);
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return 0;
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}
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BIO_set_fp(b, fp, BIO_NOCLOSE);
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ret = DHparams_print(b, x);
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BIO_free(b);
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return ret;
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}
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LCRYPTO_ALIAS(DHparams_print_fp);
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static int
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dh_pkey_public_check(const EVP_PKEY *pkey)
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{
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DH *dh = pkey->pkey.dh;
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if (dh->pub_key == NULL) {
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DHerror(DH_R_MISSING_PUBKEY);
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return 0;
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}
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return DH_check_pub_key_ex(dh, dh->pub_key);
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}
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static int
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dh_pkey_param_check(const EVP_PKEY *pkey)
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{
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DH *dh = pkey->pkey.dh;
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/*
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* It would have made more sense to support EVP_PKEY_check() for DH
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* keys and call DH_check_ex() there and keeping this as a wrapper
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* for DH_param_check_ex(). We follow OpenSSL's choice.
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*/
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return DH_check_ex(dh);
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}
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const EVP_PKEY_ASN1_METHOD dh_asn1_meth = {
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.pkey_id = EVP_PKEY_DH,
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.pkey_base_id = EVP_PKEY_DH,
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.pem_str = "DH",
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.info = "OpenSSL PKCS#3 DH method",
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.pub_decode = dh_pub_decode,
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.pub_encode = dh_pub_encode,
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.pub_cmp = dh_pub_cmp,
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.pub_print = dh_public_print,
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.priv_decode = dh_priv_decode,
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.priv_encode = dh_priv_encode,
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.priv_print = dh_private_print,
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.pkey_size = dh_size,
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.pkey_bits = dh_bits,
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.pkey_security_bits = dh_security_bits,
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.param_decode = dh_param_decode,
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.param_encode = dh_param_encode,
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.param_missing = dh_missing_parameters,
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.param_copy = dh_copy_parameters,
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.param_cmp = dh_cmp_parameters,
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.param_print = dh_param_print,
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.pkey_free = dh_free,
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.pkey_check = NULL,
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.pkey_public_check = dh_pkey_public_check,
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.pkey_param_check = dh_pkey_param_check,
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};
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