968 lines
26 KiB
C
968 lines
26 KiB
C
/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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* 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 "cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/ec.h>
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#include <openssl/bn.h>
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#ifndef OPENSSL_NO_CMS
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# include <openssl/cms.h>
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#endif
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#include <openssl/asn1t.h>
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#include "asn1_locl.h"
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#include "ec_lcl.h"
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#ifndef OPENSSL_NO_CMS
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static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
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static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
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#endif
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static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
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{
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const EC_GROUP *group;
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int nid;
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if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
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ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
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return 0;
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}
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if (EC_GROUP_get_asn1_flag(group)
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&& (nid = EC_GROUP_get_curve_name(group)))
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/* we have a 'named curve' => just set the OID */
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{
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*ppval = OBJ_nid2obj(nid);
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*pptype = V_ASN1_OBJECT;
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} else { /* explicit parameters */
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ASN1_STRING *pstr = NULL;
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pstr = ASN1_STRING_new();
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if (!pstr)
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return 0;
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pstr->length = i2d_ECParameters(ec_key, &pstr->data);
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if (pstr->length <= 0) {
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ASN1_STRING_free(pstr);
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ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
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return 0;
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}
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*ppval = pstr;
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*pptype = V_ASN1_SEQUENCE;
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}
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return 1;
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}
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static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
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{
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EC_KEY *ec_key = pkey->pkey.ec;
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void *pval = NULL;
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int ptype;
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unsigned char *penc = NULL, *p;
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int penclen;
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if (!eckey_param2type(&ptype, &pval, ec_key)) {
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ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
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return 0;
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}
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penclen = i2o_ECPublicKey(ec_key, NULL);
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if (penclen <= 0)
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goto err;
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penc = OPENSSL_malloc(penclen);
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if (!penc)
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goto err;
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p = penc;
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penclen = i2o_ECPublicKey(ec_key, &p);
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if (penclen <= 0)
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goto err;
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if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
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ptype, pval, penc, penclen))
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return 1;
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err:
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if (ptype == V_ASN1_OBJECT)
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ASN1_OBJECT_free(pval);
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else
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ASN1_STRING_free(pval);
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if (penc)
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OPENSSL_free(penc);
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return 0;
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}
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static EC_KEY *eckey_type2param(int ptype, void *pval)
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{
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EC_KEY *eckey = NULL;
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if (ptype == V_ASN1_SEQUENCE) {
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ASN1_STRING *pstr = pval;
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const unsigned char *pm = NULL;
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int pmlen;
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pm = pstr->data;
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pmlen = pstr->length;
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if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen))) {
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ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
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goto ecerr;
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}
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} else if (ptype == V_ASN1_OBJECT) {
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ASN1_OBJECT *poid = pval;
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EC_GROUP *group;
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/*
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* type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
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*/
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if ((eckey = EC_KEY_new()) == NULL) {
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ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
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goto ecerr;
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}
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group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
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if (group == NULL)
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goto ecerr;
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EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
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if (EC_KEY_set_group(eckey, group) == 0)
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goto ecerr;
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EC_GROUP_free(group);
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} else {
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ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
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goto ecerr;
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}
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return eckey;
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ecerr:
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if (eckey)
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EC_KEY_free(eckey);
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return NULL;
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}
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static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
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{
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const unsigned char *p = NULL;
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void *pval;
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int ptype, pklen;
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EC_KEY *eckey = NULL;
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X509_ALGOR *palg;
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if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
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return 0;
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X509_ALGOR_get0(NULL, &ptype, &pval, palg);
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eckey = eckey_type2param(ptype, pval);
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if (!eckey) {
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ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
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return 0;
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}
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/* We have parameters now set public key */
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if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
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ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
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goto ecerr;
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}
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EVP_PKEY_assign_EC_KEY(pkey, eckey);
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return 1;
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ecerr:
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if (eckey)
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EC_KEY_free(eckey);
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return 0;
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}
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static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
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{
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int r;
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const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
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const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
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*pb = EC_KEY_get0_public_key(b->pkey.ec);
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if (group == NULL || pa == NULL || pb == NULL)
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return -2;
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r = EC_POINT_cmp(group, pa, pb, NULL);
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if (r == 0)
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return 1;
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if (r == 1)
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return 0;
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return -2;
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}
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static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
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{
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const unsigned char *p = NULL;
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void *pval;
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int ptype, pklen;
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EC_KEY *eckey = NULL;
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X509_ALGOR *palg;
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if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
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return 0;
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X509_ALGOR_get0(NULL, &ptype, &pval, palg);
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eckey = eckey_type2param(ptype, pval);
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if (!eckey)
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goto ecliberr;
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/* We have parameters now set private key */
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if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
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ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
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goto ecerr;
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}
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/* calculate public key (if necessary) */
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if (EC_KEY_get0_public_key(eckey) == NULL) {
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const BIGNUM *priv_key;
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const EC_GROUP *group;
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EC_POINT *pub_key;
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/*
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* the public key was not included in the SEC1 private key =>
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* calculate the public key
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*/
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group = EC_KEY_get0_group(eckey);
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pub_key = EC_POINT_new(group);
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if (pub_key == NULL) {
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ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
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goto ecliberr;
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}
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if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group))) {
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EC_POINT_free(pub_key);
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ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
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goto ecliberr;
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}
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priv_key = EC_KEY_get0_private_key(eckey);
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if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL)) {
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EC_POINT_free(pub_key);
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ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
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goto ecliberr;
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}
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if (EC_KEY_set_public_key(eckey, pub_key) == 0) {
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EC_POINT_free(pub_key);
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ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
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goto ecliberr;
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}
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EC_POINT_free(pub_key);
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}
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|
|
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EVP_PKEY_assign_EC_KEY(pkey, eckey);
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return 1;
|
|
|
|
ecliberr:
|
|
ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
|
|
ecerr:
|
|
if (eckey)
|
|
EC_KEY_free(eckey);
|
|
return 0;
|
|
}
|
|
|
|
static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
|
|
{
|
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EC_KEY ec_key = *(pkey->pkey.ec);
|
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unsigned char *ep, *p;
|
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int eplen, ptype;
|
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void *pval;
|
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unsigned int old_flags;
|
|
|
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if (!eckey_param2type(&ptype, &pval, &ec_key)) {
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ECerr(EC_F_ECKEY_PRIV_ENCODE, EC_R_DECODE_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
/* set the private key */
|
|
|
|
/*
|
|
* do not include the parameters in the SEC1 private key see PKCS#11
|
|
* 12.11
|
|
*/
|
|
old_flags = EC_KEY_get_enc_flags(&ec_key);
|
|
EC_KEY_set_enc_flags(&ec_key, old_flags | EC_PKEY_NO_PARAMETERS);
|
|
|
|
eplen = i2d_ECPrivateKey(&ec_key, NULL);
|
|
if (!eplen) {
|
|
ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
|
|
return 0;
|
|
}
|
|
ep = (unsigned char *)OPENSSL_malloc(eplen);
|
|
if (!ep) {
|
|
ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
p = ep;
|
|
if (!i2d_ECPrivateKey(&ec_key, &p)) {
|
|
OPENSSL_free(ep);
|
|
ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
|
|
return 0;
|
|
}
|
|
|
|
if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
|
|
ptype, pval, ep, eplen)) {
|
|
OPENSSL_free(ep);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int int_ec_size(const EVP_PKEY *pkey)
|
|
{
|
|
return ECDSA_size(pkey->pkey.ec);
|
|
}
|
|
|
|
static int ec_bits(const EVP_PKEY *pkey)
|
|
{
|
|
BIGNUM *order = BN_new();
|
|
const EC_GROUP *group;
|
|
int ret;
|
|
|
|
if (!order) {
|
|
ERR_clear_error();
|
|
return 0;
|
|
}
|
|
group = EC_KEY_get0_group(pkey->pkey.ec);
|
|
if (!EC_GROUP_get_order(group, order, NULL)) {
|
|
ERR_clear_error();
|
|
return 0;
|
|
}
|
|
|
|
ret = BN_num_bits(order);
|
|
BN_free(order);
|
|
return ret;
|
|
}
|
|
|
|
static int ec_missing_parameters(const EVP_PKEY *pkey)
|
|
{
|
|
if (pkey->pkey.ec == NULL || EC_KEY_get0_group(pkey->pkey.ec) == NULL)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
|
|
{
|
|
EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
|
|
if (group == NULL)
|
|
return 0;
|
|
if (EC_KEY_set_group(to->pkey.ec, group) == 0)
|
|
return 0;
|
|
EC_GROUP_free(group);
|
|
return 1;
|
|
}
|
|
|
|
static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
|
|
{
|
|
const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
|
|
*group_b = EC_KEY_get0_group(b->pkey.ec);
|
|
if (group_a == NULL || group_b == NULL)
|
|
return -2;
|
|
if (EC_GROUP_cmp(group_a, group_b, NULL))
|
|
return 0;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
static void int_ec_free(EVP_PKEY *pkey)
|
|
{
|
|
EC_KEY_free(pkey->pkey.ec);
|
|
}
|
|
|
|
static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype)
|
|
{
|
|
unsigned char *buffer = NULL;
|
|
const char *ecstr;
|
|
size_t buf_len = 0, i;
|
|
int ret = 0, reason = ERR_R_BIO_LIB;
|
|
BIGNUM *pub_key = NULL, *order = NULL;
|
|
BN_CTX *ctx = NULL;
|
|
const EC_GROUP *group;
|
|
const EC_POINT *public_key;
|
|
const BIGNUM *priv_key;
|
|
|
|
if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
|
|
reason = ERR_R_PASSED_NULL_PARAMETER;
|
|
goto err;
|
|
}
|
|
|
|
ctx = BN_CTX_new();
|
|
if (ctx == NULL) {
|
|
reason = ERR_R_MALLOC_FAILURE;
|
|
goto err;
|
|
}
|
|
|
|
if (ktype > 0) {
|
|
public_key = EC_KEY_get0_public_key(x);
|
|
if (public_key != NULL) {
|
|
if ((pub_key = EC_POINT_point2bn(group, public_key,
|
|
EC_KEY_get_conv_form(x), NULL,
|
|
ctx)) == NULL) {
|
|
reason = ERR_R_EC_LIB;
|
|
goto err;
|
|
}
|
|
buf_len = (size_t)BN_num_bytes(pub_key);
|
|
}
|
|
}
|
|
|
|
if (ktype == 2) {
|
|
priv_key = EC_KEY_get0_private_key(x);
|
|
if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len)
|
|
buf_len = i;
|
|
} else
|
|
priv_key = NULL;
|
|
|
|
if (ktype > 0) {
|
|
buf_len += 10;
|
|
if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {
|
|
reason = ERR_R_MALLOC_FAILURE;
|
|
goto err;
|
|
}
|
|
}
|
|
if (ktype == 2)
|
|
ecstr = "Private-Key";
|
|
else if (ktype == 1)
|
|
ecstr = "Public-Key";
|
|
else
|
|
ecstr = "ECDSA-Parameters";
|
|
|
|
if (!BIO_indent(bp, off, 128))
|
|
goto err;
|
|
if ((order = BN_new()) == NULL)
|
|
goto err;
|
|
if (!EC_GROUP_get_order(group, order, NULL))
|
|
goto err;
|
|
if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, BN_num_bits(order)) <= 0)
|
|
goto err;
|
|
|
|
if ((priv_key != NULL) && !ASN1_bn_print(bp, "priv:", priv_key,
|
|
buffer, off))
|
|
goto err;
|
|
if ((pub_key != NULL) && !ASN1_bn_print(bp, "pub: ", pub_key,
|
|
buffer, off))
|
|
goto err;
|
|
if (!ECPKParameters_print(bp, group, off))
|
|
goto err;
|
|
ret = 1;
|
|
err:
|
|
if (!ret)
|
|
ECerr(EC_F_DO_EC_KEY_PRINT, reason);
|
|
if (pub_key)
|
|
BN_free(pub_key);
|
|
if (order)
|
|
BN_free(order);
|
|
if (ctx)
|
|
BN_CTX_free(ctx);
|
|
if (buffer != NULL)
|
|
OPENSSL_free(buffer);
|
|
return (ret);
|
|
}
|
|
|
|
static int eckey_param_decode(EVP_PKEY *pkey,
|
|
const unsigned char **pder, int derlen)
|
|
{
|
|
EC_KEY *eckey;
|
|
if (!(eckey = d2i_ECParameters(NULL, pder, derlen))) {
|
|
ECerr(EC_F_ECKEY_PARAM_DECODE, ERR_R_EC_LIB);
|
|
return 0;
|
|
}
|
|
EVP_PKEY_assign_EC_KEY(pkey, eckey);
|
|
return 1;
|
|
}
|
|
|
|
static int eckey_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
|
|
{
|
|
return i2d_ECParameters(pkey->pkey.ec, pder);
|
|
}
|
|
|
|
static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
|
|
ASN1_PCTX *ctx)
|
|
{
|
|
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
|
|
}
|
|
|
|
static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
|
|
ASN1_PCTX *ctx)
|
|
{
|
|
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
|
|
}
|
|
|
|
static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
|
|
ASN1_PCTX *ctx)
|
|
{
|
|
return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
|
|
}
|
|
|
|
static int old_ec_priv_decode(EVP_PKEY *pkey,
|
|
const unsigned char **pder, int derlen)
|
|
{
|
|
EC_KEY *ec;
|
|
if (!(ec = d2i_ECPrivateKey(NULL, pder, derlen))) {
|
|
ECerr(EC_F_OLD_EC_PRIV_DECODE, EC_R_DECODE_ERROR);
|
|
return 0;
|
|
}
|
|
EVP_PKEY_assign_EC_KEY(pkey, ec);
|
|
return 1;
|
|
}
|
|
|
|
static int old_ec_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
|
|
{
|
|
return i2d_ECPrivateKey(pkey->pkey.ec, pder);
|
|
}
|
|
|
|
static int ec_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
|
|
{
|
|
switch (op) {
|
|
case ASN1_PKEY_CTRL_PKCS7_SIGN:
|
|
if (arg1 == 0) {
|
|
int snid, hnid;
|
|
X509_ALGOR *alg1, *alg2;
|
|
PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, &alg1, &alg2);
|
|
if (alg1 == NULL || alg1->algorithm == NULL)
|
|
return -1;
|
|
hnid = OBJ_obj2nid(alg1->algorithm);
|
|
if (hnid == NID_undef)
|
|
return -1;
|
|
if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
|
|
return -1;
|
|
X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
|
|
}
|
|
return 1;
|
|
#ifndef OPENSSL_NO_CMS
|
|
case ASN1_PKEY_CTRL_CMS_SIGN:
|
|
if (arg1 == 0) {
|
|
int snid, hnid;
|
|
X509_ALGOR *alg1, *alg2;
|
|
CMS_SignerInfo_get0_algs(arg2, NULL, NULL, &alg1, &alg2);
|
|
if (alg1 == NULL || alg1->algorithm == NULL)
|
|
return -1;
|
|
hnid = OBJ_obj2nid(alg1->algorithm);
|
|
if (hnid == NID_undef)
|
|
return -1;
|
|
if (!OBJ_find_sigid_by_algs(&snid, hnid, EVP_PKEY_id(pkey)))
|
|
return -1;
|
|
X509_ALGOR_set0(alg2, OBJ_nid2obj(snid), V_ASN1_UNDEF, 0);
|
|
}
|
|
return 1;
|
|
|
|
case ASN1_PKEY_CTRL_CMS_ENVELOPE:
|
|
if (arg1 == 1)
|
|
return ecdh_cms_decrypt(arg2);
|
|
else if (arg1 == 0)
|
|
return ecdh_cms_encrypt(arg2);
|
|
return -2;
|
|
|
|
case ASN1_PKEY_CTRL_CMS_RI_TYPE:
|
|
*(int *)arg2 = CMS_RECIPINFO_AGREE;
|
|
return 1;
|
|
#endif
|
|
|
|
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
|
|
*(int *)arg2 = NID_sha256;
|
|
return 2;
|
|
|
|
default:
|
|
return -2;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
const EVP_PKEY_ASN1_METHOD eckey_asn1_meth = {
|
|
EVP_PKEY_EC,
|
|
EVP_PKEY_EC,
|
|
0,
|
|
"EC",
|
|
"OpenSSL EC algorithm",
|
|
|
|
eckey_pub_decode,
|
|
eckey_pub_encode,
|
|
eckey_pub_cmp,
|
|
eckey_pub_print,
|
|
|
|
eckey_priv_decode,
|
|
eckey_priv_encode,
|
|
eckey_priv_print,
|
|
|
|
int_ec_size,
|
|
ec_bits,
|
|
|
|
eckey_param_decode,
|
|
eckey_param_encode,
|
|
ec_missing_parameters,
|
|
ec_copy_parameters,
|
|
ec_cmp_parameters,
|
|
eckey_param_print,
|
|
0,
|
|
|
|
int_ec_free,
|
|
ec_pkey_ctrl,
|
|
old_ec_priv_decode,
|
|
old_ec_priv_encode
|
|
};
|
|
|
|
#ifndef OPENSSL_NO_CMS
|
|
|
|
static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
|
|
X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
|
|
{
|
|
ASN1_OBJECT *aoid;
|
|
int atype;
|
|
void *aval;
|
|
int rv = 0;
|
|
EVP_PKEY *pkpeer = NULL;
|
|
EC_KEY *ecpeer = NULL;
|
|
const unsigned char *p;
|
|
int plen;
|
|
X509_ALGOR_get0(&aoid, &atype, &aval, alg);
|
|
if (OBJ_obj2nid(aoid) != NID_X9_62_id_ecPublicKey)
|
|
goto err;
|
|
/* If absent parameters get group from main key */
|
|
if (atype == V_ASN1_UNDEF || atype == V_ASN1_NULL) {
|
|
const EC_GROUP *grp;
|
|
EVP_PKEY *pk;
|
|
pk = EVP_PKEY_CTX_get0_pkey(pctx);
|
|
if (!pk)
|
|
goto err;
|
|
grp = EC_KEY_get0_group(pk->pkey.ec);
|
|
ecpeer = EC_KEY_new();
|
|
if (!ecpeer)
|
|
goto err;
|
|
if (!EC_KEY_set_group(ecpeer, grp))
|
|
goto err;
|
|
} else {
|
|
ecpeer = eckey_type2param(atype, aval);
|
|
if (!ecpeer)
|
|
goto err;
|
|
}
|
|
/* We have parameters now set public key */
|
|
plen = ASN1_STRING_length(pubkey);
|
|
p = ASN1_STRING_data(pubkey);
|
|
if (!p || !plen)
|
|
goto err;
|
|
if (!o2i_ECPublicKey(&ecpeer, &p, plen))
|
|
goto err;
|
|
pkpeer = EVP_PKEY_new();
|
|
if (!pkpeer)
|
|
goto err;
|
|
EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
|
|
if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
|
|
rv = 1;
|
|
err:
|
|
if (ecpeer)
|
|
EC_KEY_free(ecpeer);
|
|
if (pkpeer)
|
|
EVP_PKEY_free(pkpeer);
|
|
return rv;
|
|
}
|
|
|
|
/* Set KDF parameters based on KDF NID */
|
|
static int ecdh_cms_set_kdf_param(EVP_PKEY_CTX *pctx, int eckdf_nid)
|
|
{
|
|
int kdf_nid, kdfmd_nid, cofactor;
|
|
const EVP_MD *kdf_md;
|
|
if (eckdf_nid == NID_undef)
|
|
return 0;
|
|
|
|
/* Lookup KDF type, cofactor mode and digest */
|
|
if (!OBJ_find_sigid_algs(eckdf_nid, &kdfmd_nid, &kdf_nid))
|
|
return 0;
|
|
|
|
if (kdf_nid == NID_dh_std_kdf)
|
|
cofactor = 0;
|
|
else if (kdf_nid == NID_dh_cofactor_kdf)
|
|
cofactor = 1;
|
|
else
|
|
return 0;
|
|
|
|
if (EVP_PKEY_CTX_set_ecdh_cofactor_mode(pctx, cofactor) <= 0)
|
|
return 0;
|
|
|
|
if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, EVP_PKEY_ECDH_KDF_X9_62) <= 0)
|
|
return 0;
|
|
|
|
kdf_md = EVP_get_digestbynid(kdfmd_nid);
|
|
if (!kdf_md)
|
|
return 0;
|
|
|
|
if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int ecdh_cms_set_shared_info(EVP_PKEY_CTX *pctx, CMS_RecipientInfo *ri)
|
|
{
|
|
int rv = 0;
|
|
|
|
X509_ALGOR *alg, *kekalg = NULL;
|
|
ASN1_OCTET_STRING *ukm;
|
|
const unsigned char *p;
|
|
unsigned char *der = NULL;
|
|
int plen, keylen;
|
|
const EVP_CIPHER *kekcipher;
|
|
EVP_CIPHER_CTX *kekctx;
|
|
|
|
if (!CMS_RecipientInfo_kari_get0_alg(ri, &alg, &ukm))
|
|
return 0;
|
|
|
|
if (!ecdh_cms_set_kdf_param(pctx, OBJ_obj2nid(alg->algorithm))) {
|
|
ECerr(EC_F_ECDH_CMS_SET_SHARED_INFO, EC_R_KDF_PARAMETER_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
if (alg->parameter->type != V_ASN1_SEQUENCE)
|
|
return 0;
|
|
|
|
p = alg->parameter->value.sequence->data;
|
|
plen = alg->parameter->value.sequence->length;
|
|
kekalg = d2i_X509_ALGOR(NULL, &p, plen);
|
|
if (!kekalg)
|
|
goto err;
|
|
kekctx = CMS_RecipientInfo_kari_get0_ctx(ri);
|
|
if (!kekctx)
|
|
goto err;
|
|
kekcipher = EVP_get_cipherbyobj(kekalg->algorithm);
|
|
if (!kekcipher || EVP_CIPHER_mode(kekcipher) != EVP_CIPH_WRAP_MODE)
|
|
goto err;
|
|
if (!EVP_EncryptInit_ex(kekctx, kekcipher, NULL, NULL, NULL))
|
|
goto err;
|
|
if (EVP_CIPHER_asn1_to_param(kekctx, kekalg->parameter) <= 0)
|
|
goto err;
|
|
|
|
keylen = EVP_CIPHER_CTX_key_length(kekctx);
|
|
if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
|
|
goto err;
|
|
|
|
plen = CMS_SharedInfo_encode(&der, kekalg, ukm, keylen);
|
|
|
|
if (!plen)
|
|
goto err;
|
|
|
|
if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, der, plen) <= 0)
|
|
goto err;
|
|
der = NULL;
|
|
|
|
rv = 1;
|
|
err:
|
|
if (kekalg)
|
|
X509_ALGOR_free(kekalg);
|
|
if (der)
|
|
OPENSSL_free(der);
|
|
return rv;
|
|
}
|
|
|
|
static int ecdh_cms_decrypt(CMS_RecipientInfo *ri)
|
|
{
|
|
EVP_PKEY_CTX *pctx;
|
|
pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
|
|
if (!pctx)
|
|
return 0;
|
|
/* See if we need to set peer key */
|
|
if (!EVP_PKEY_CTX_get0_peerkey(pctx)) {
|
|
X509_ALGOR *alg;
|
|
ASN1_BIT_STRING *pubkey;
|
|
if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &alg, &pubkey,
|
|
NULL, NULL, NULL))
|
|
return 0;
|
|
if (!alg || !pubkey)
|
|
return 0;
|
|
if (!ecdh_cms_set_peerkey(pctx, alg, pubkey)) {
|
|
ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_PEER_KEY_ERROR);
|
|
return 0;
|
|
}
|
|
}
|
|
/* Set ECDH derivation parameters and initialise unwrap context */
|
|
if (!ecdh_cms_set_shared_info(pctx, ri)) {
|
|
ECerr(EC_F_ECDH_CMS_DECRYPT, EC_R_SHARED_INFO_ERROR);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int ecdh_cms_encrypt(CMS_RecipientInfo *ri)
|
|
{
|
|
EVP_PKEY_CTX *pctx;
|
|
EVP_PKEY *pkey;
|
|
EVP_CIPHER_CTX *ctx;
|
|
int keylen;
|
|
X509_ALGOR *talg, *wrap_alg = NULL;
|
|
ASN1_OBJECT *aoid;
|
|
ASN1_BIT_STRING *pubkey;
|
|
ASN1_STRING *wrap_str;
|
|
ASN1_OCTET_STRING *ukm;
|
|
unsigned char *penc = NULL;
|
|
int penclen;
|
|
int rv = 0;
|
|
int ecdh_nid, kdf_type, kdf_nid, wrap_nid;
|
|
const EVP_MD *kdf_md;
|
|
pctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
|
|
if (!pctx)
|
|
return 0;
|
|
/* Get ephemeral key */
|
|
pkey = EVP_PKEY_CTX_get0_pkey(pctx);
|
|
if (!CMS_RecipientInfo_kari_get0_orig_id(ri, &talg, &pubkey,
|
|
NULL, NULL, NULL))
|
|
goto err;
|
|
X509_ALGOR_get0(&aoid, NULL, NULL, talg);
|
|
/* Is everything uninitialised? */
|
|
if (aoid == OBJ_nid2obj(NID_undef)) {
|
|
|
|
EC_KEY *eckey = pkey->pkey.ec;
|
|
/* Set the key */
|
|
unsigned char *p;
|
|
|
|
penclen = i2o_ECPublicKey(eckey, NULL);
|
|
if (penclen <= 0)
|
|
goto err;
|
|
penc = OPENSSL_malloc(penclen);
|
|
if (!penc)
|
|
goto err;
|
|
p = penc;
|
|
penclen = i2o_ECPublicKey(eckey, &p);
|
|
if (penclen <= 0)
|
|
goto err;
|
|
ASN1_STRING_set0(pubkey, penc, penclen);
|
|
pubkey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
|
|
pubkey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
|
|
|
|
penc = NULL;
|
|
X509_ALGOR_set0(talg, OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
|
|
V_ASN1_UNDEF, NULL);
|
|
}
|
|
|
|
/* See if custom paraneters set */
|
|
kdf_type = EVP_PKEY_CTX_get_ecdh_kdf_type(pctx);
|
|
if (kdf_type <= 0)
|
|
goto err;
|
|
if (!EVP_PKEY_CTX_get_ecdh_kdf_md(pctx, &kdf_md))
|
|
goto err;
|
|
ecdh_nid = EVP_PKEY_CTX_get_ecdh_cofactor_mode(pctx);
|
|
if (ecdh_nid < 0)
|
|
goto err;
|
|
else if (ecdh_nid == 0)
|
|
ecdh_nid = NID_dh_std_kdf;
|
|
else if (ecdh_nid == 1)
|
|
ecdh_nid = NID_dh_cofactor_kdf;
|
|
|
|
if (kdf_type == EVP_PKEY_ECDH_KDF_NONE) {
|
|
kdf_type = EVP_PKEY_ECDH_KDF_X9_62;
|
|
if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
|
|
goto err;
|
|
} else
|
|
/* Uknown KDF */
|
|
goto err;
|
|
if (kdf_md == NULL) {
|
|
/* Fixme later for better MD */
|
|
kdf_md = EVP_sha1();
|
|
if (EVP_PKEY_CTX_set_ecdh_kdf_md(pctx, kdf_md) <= 0)
|
|
goto err;
|
|
}
|
|
|
|
if (!CMS_RecipientInfo_kari_get0_alg(ri, &talg, &ukm))
|
|
goto err;
|
|
|
|
/* Lookup NID for KDF+cofactor+digest */
|
|
|
|
if (!OBJ_find_sigid_by_algs(&kdf_nid, EVP_MD_type(kdf_md), ecdh_nid))
|
|
goto err;
|
|
/* Get wrap NID */
|
|
ctx = CMS_RecipientInfo_kari_get0_ctx(ri);
|
|
wrap_nid = EVP_CIPHER_CTX_type(ctx);
|
|
keylen = EVP_CIPHER_CTX_key_length(ctx);
|
|
|
|
/* Package wrap algorithm in an AlgorithmIdentifier */
|
|
|
|
wrap_alg = X509_ALGOR_new();
|
|
if (!wrap_alg)
|
|
goto err;
|
|
wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
|
|
wrap_alg->parameter = ASN1_TYPE_new();
|
|
if (!wrap_alg->parameter)
|
|
goto err;
|
|
if (EVP_CIPHER_param_to_asn1(ctx, wrap_alg->parameter) <= 0)
|
|
goto err;
|
|
if (ASN1_TYPE_get(wrap_alg->parameter) == NID_undef) {
|
|
ASN1_TYPE_free(wrap_alg->parameter);
|
|
wrap_alg->parameter = NULL;
|
|
}
|
|
|
|
if (EVP_PKEY_CTX_set_ecdh_kdf_outlen(pctx, keylen) <= 0)
|
|
goto err;
|
|
|
|
penclen = CMS_SharedInfo_encode(&penc, wrap_alg, ukm, keylen);
|
|
|
|
if (!penclen)
|
|
goto err;
|
|
|
|
if (EVP_PKEY_CTX_set0_ecdh_kdf_ukm(pctx, penc, penclen) <= 0)
|
|
goto err;
|
|
penc = NULL;
|
|
|
|
/*
|
|
* Now need to wrap encoding of wrap AlgorithmIdentifier into parameter
|
|
* of another AlgorithmIdentifier.
|
|
*/
|
|
penclen = i2d_X509_ALGOR(wrap_alg, &penc);
|
|
if (!penc || !penclen)
|
|
goto err;
|
|
wrap_str = ASN1_STRING_new();
|
|
if (!wrap_str)
|
|
goto err;
|
|
ASN1_STRING_set0(wrap_str, penc, penclen);
|
|
penc = NULL;
|
|
X509_ALGOR_set0(talg, OBJ_nid2obj(kdf_nid), V_ASN1_SEQUENCE, wrap_str);
|
|
|
|
rv = 1;
|
|
|
|
err:
|
|
if (penc)
|
|
OPENSSL_free(penc);
|
|
if (wrap_alg)
|
|
X509_ALGOR_free(wrap_alg);
|
|
return rv;
|
|
}
|
|
|
|
#endif
|