-/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
- * project 2006.
- */
-/* ====================================================================
- * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. All advertising materials mentioning features or use of this
- * software must display the following acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
- *
- * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
- * endorse or promote products derived from this software without
- * prior written permission. For written permission, please contact
- * licensing@OpenSSL.org.
- *
- * 5. Products derived from this software may not be called "OpenSSL"
- * nor may "OpenSSL" appear in their names without prior written
- * permission of the OpenSSL Project.
- *
- * 6. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by the OpenSSL Project
- * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
- *
- * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
- * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
- * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
- * OF THE POSSIBILITY OF SUCH DAMAGE.
- * ====================================================================
- *
- * This product includes cryptographic software written by Eric Young
- * (eay@cryptsoft.com). This product includes software written by Tim
- * Hudson (tjh@cryptsoft.com).
+/*
+ * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
*
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/*
+ * ECDH and ECDSA low level APIs are deprecated for public use, but still ok
+ * for internal use.
*/
+#include "internal/deprecated.h"
#include <stdio.h>
-#include "cryptlib.h"
+#include "internal/cryptlib.h"
#include <openssl/x509.h>
#include <openssl/ec.h>
-#include "asn1_locl.h"
-
-static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key)
- {
- const EC_GROUP *group;
- int nid;
- if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL)
- {
- ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
- return 0;
- }
- if (EC_GROUP_get_asn1_flag(group)
- && (nid = EC_GROUP_get_curve_name(group)))
- /* we have a 'named curve' => just set the OID */
- {
- *ppval = OBJ_nid2obj(nid);
- *pptype = V_ASN1_OBJECT;
- }
- else /* explicit parameters */
- {
- ASN1_STRING *pstr = NULL;
- pstr = ASN1_STRING_new();
- if (!pstr)
- return 0;
- pstr->length = i2d_ECParameters(ec_key, &pstr->data);
- if (pstr->length < 0)
- {
- ASN1_STRING_free(pstr);
- ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
- return 0;
- }
- *ppval = pstr;
- *pptype = V_ASN1_SEQUENCE;
- }
- return 1;
- }
+#include <openssl/bn.h>
+#include <openssl/cms.h>
+#include <openssl/asn1t.h>
+#include "crypto/asn1.h"
+#include "crypto/evp.h"
+#include <openssl/core_names.h>
+#include "openssl/param_build.h"
+#include "ec_local.h"
+
+#ifndef OPENSSL_NO_CMS
+static int ecdh_cms_decrypt(CMS_RecipientInfo *ri);
+static int ecdh_cms_encrypt(CMS_RecipientInfo *ri);
+#endif
+
+static int eckey_param2type(int *pptype, void **ppval, const EC_KEY *ec_key)
+{
+ const EC_GROUP *group;
+ int nid;
+ if (ec_key == NULL || (group = EC_KEY_get0_group(ec_key)) == NULL) {
+ ECerr(EC_F_ECKEY_PARAM2TYPE, EC_R_MISSING_PARAMETERS);
+ return 0;
+ }
+ if (EC_GROUP_get_asn1_flag(group)
+ && (nid = EC_GROUP_get_curve_name(group)))
+ /* we have a 'named curve' => just set the OID */
+ {
+ *ppval = OBJ_nid2obj(nid);
+ *pptype = V_ASN1_OBJECT;
+ } else { /* explicit parameters */
+
+ ASN1_STRING *pstr = NULL;
+ pstr = ASN1_STRING_new();
+ if (pstr == NULL)
+ return 0;
+ pstr->length = i2d_ECParameters(ec_key, &pstr->data);
+ if (pstr->length <= 0) {
+ ASN1_STRING_free(pstr);
+ ECerr(EC_F_ECKEY_PARAM2TYPE, ERR_R_EC_LIB);
+ return 0;
+ }
+ *ppval = pstr;
+ *pptype = V_ASN1_SEQUENCE;
+ }
+ return 1;
+}
static int eckey_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
- {
- EC_KEY *ec_key = pkey->pkey.ec;
- void *pval = NULL;
- int ptype;
- unsigned char *penc = NULL, *p;
- int penclen;
-
- if (!eckey_param2type(&ptype, &pval, ec_key))
- {
- ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
- return 0;
- }
- penclen = i2o_ECPublicKey(ec_key, NULL);
- if (penclen <= 0)
- goto err;
- penc = OPENSSL_malloc(penclen);
- if (!penc)
- goto err;
- p = penc;
- penclen = i2o_ECPublicKey(ec_key, &p);
- if (penclen <= 0)
- goto err;
- if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
- ptype, pval, penc, penclen))
- return 1;
- err:
- if (ptype == V_ASN1_OBJECT)
- ASN1_OBJECT_free(pval);
- else
- ASN1_STRING_free(pval);
- if (penc)
- OPENSSL_free(penc);
- return 0;
- }
-
-static EC_KEY *eckey_type2param(int ptype, void *pval)
- {
- EC_KEY *eckey = NULL;
- if (ptype == V_ASN1_SEQUENCE)
- {
- ASN1_STRING *pstr = pval;
- const unsigned char *pm = NULL;
- int pmlen;
- pm = pstr->data;
- pmlen = pstr->length;
- if (!(eckey = d2i_ECParameters(NULL, &pm, pmlen)))
- {
- ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
- goto ecerr;
- }
- }
- else if (ptype == V_ASN1_OBJECT)
- {
- ASN1_OBJECT *poid = pval;
- EC_GROUP *group;
-
- /* type == V_ASN1_OBJECT => the parameters are given
- * by an asn1 OID
- */
- if ((eckey = EC_KEY_new()) == NULL)
- {
- ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
- goto ecerr;
- }
- group = EC_GROUP_new_by_curve_name(OBJ_obj2nid(poid));
- if (group == NULL)
- goto ecerr;
- EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
- if (EC_KEY_set_group(eckey, group) == 0)
- goto ecerr;
- EC_GROUP_free(group);
- }
- else
- {
- ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
- goto ecerr;
- }
-
- return eckey;
-
- ecerr:
- if (eckey)
- EC_KEY_free(eckey);
- return NULL;
- }
-
-static int eckey_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
- {
- const unsigned char *p = NULL;
- void *pval;
- int ptype, pklen;
- EC_KEY *eckey = NULL;
- X509_ALGOR *palg;
-
- if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
- return 0;
- X509_ALGOR_get0(NULL, &ptype, &pval, palg);
-
- eckey = eckey_type2param(ptype, pval);
-
- if (!eckey)
- {
- ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
- return 0;
- }
-
- /* We have parameters now set public key */
- if (!o2i_ECPublicKey(&eckey, &p, pklen))
- {
- ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
- goto ecerr;
- }
-
- EVP_PKEY_assign_EC_KEY(pkey, eckey);
- return 1;
-
- ecerr:
- if (eckey)
- EC_KEY_free(eckey);
- return 0;
- }
+{
+ const EC_KEY *ec_key = pkey->pkey.ec;
+ void *pval = NULL;
+ int ptype;
+ unsigned char *penc = NULL, *p;
+ int penclen;
+
+ if (!eckey_param2type(&ptype, &pval, ec_key)) {
+ ECerr(EC_F_ECKEY_PUB_ENCODE, ERR_R_EC_LIB);
+ return 0;
+ }
+ penclen = i2o_ECPublicKey(ec_key, NULL);
+ if (penclen <= 0)
+ goto err;
+ penc = OPENSSL_malloc(penclen);
+ if (penc == NULL)
+ goto err;
+ p = penc;
+ penclen = i2o_ECPublicKey(ec_key, &p);
+ if (penclen <= 0)
+ goto err;
+ if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_EC),
+ ptype, pval, penc, penclen))
+ return 1;
+ err:
+ if (ptype == V_ASN1_OBJECT)
+ ASN1_OBJECT_free(pval);
+ else
+ ASN1_STRING_free(pval);
+ OPENSSL_free(penc);
+ return 0;
+}
+
+static EC_KEY *eckey_type2param(int ptype, const void *pval,
+ OPENSSL_CTX *libctx, const char *propq)
+{
+ EC_KEY *eckey = NULL;
+ EC_GROUP *group = NULL;
+
+ if ((eckey = EC_KEY_new_with_libctx(libctx, propq)) == NULL) {
+ ECerr(EC_F_ECKEY_TYPE2PARAM, ERR_R_MALLOC_FAILURE);
+ goto ecerr;
+ }
+
+ if (ptype == V_ASN1_SEQUENCE) {
+ const ASN1_STRING *pstr = pval;
+ const unsigned char *pm = pstr->data;
+ int pmlen = pstr->length;
+
+
+ if (d2i_ECParameters(&eckey, &pm, pmlen) == NULL) {
+ ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
+ goto ecerr;
+ }
+ } else if (ptype == V_ASN1_OBJECT) {
+ const ASN1_OBJECT *poid = pval;
+
+ /*
+ * type == V_ASN1_OBJECT => the parameters are given by an asn1 OID
+ */
+
+ group = EC_GROUP_new_by_curve_name_with_libctx(libctx, propq,
+ OBJ_obj2nid(poid));
+ if (group == NULL)
+ goto ecerr;
+ EC_GROUP_set_asn1_flag(group, OPENSSL_EC_NAMED_CURVE);
+ if (EC_KEY_set_group(eckey, group) == 0)
+ goto ecerr;
+ EC_GROUP_free(group);
+ } else {
+ ECerr(EC_F_ECKEY_TYPE2PARAM, EC_R_DECODE_ERROR);
+ goto ecerr;
+ }
+
+ return eckey;
+
+ ecerr:
+ EC_KEY_free(eckey);
+ EC_GROUP_free(group);
+ return NULL;
+}
+
+static int eckey_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
+{
+ const unsigned char *p = NULL;
+ const void *pval;
+ int ptype, pklen;
+ EC_KEY *eckey = NULL;
+ X509_ALGOR *palg;
+
+ if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
+ return 0;
+ X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+ eckey = eckey_type2param(ptype, pval, NULL, NULL);
+
+ if (!eckey) {
+ ECerr(EC_F_ECKEY_PUB_DECODE, ERR_R_EC_LIB);
+ return 0;
+ }
+
+ /* We have parameters now set public key */
+ if (!o2i_ECPublicKey(&eckey, &p, pklen)) {
+ ECerr(EC_F_ECKEY_PUB_DECODE, EC_R_DECODE_ERROR);
+ goto ecerr;
+ }
+
+ EVP_PKEY_assign_EC_KEY(pkey, eckey);
+ return 1;
+
+ ecerr:
+ EC_KEY_free(eckey);
+ return 0;
+}
static int eckey_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
- {
- int r;
- const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
- const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
- *pb = EC_KEY_get0_public_key(b->pkey.ec);
- r = EC_POINT_cmp(group, pa, pb, NULL);
- if (r == 0)
- return 1;
- if (r == 1)
- return 0;
- return -2;
- }
-
-static int eckey_priv_decode(EVP_PKEY *pkey, PKCS8_PRIV_KEY_INFO *p8)
- {
- const unsigned char *p = NULL;
- void *pval;
- int ptype, pklen;
- EC_KEY *eckey = NULL;
- X509_ALGOR *palg;
-
- if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
- return 0;
- X509_ALGOR_get0(NULL, &ptype, &pval, palg);
-
- eckey = eckey_type2param(ptype, pval);
-
- if (!eckey)
- goto ecliberr;
-
- /* We have parameters now set private key */
- if (!d2i_ECPrivateKey(&eckey, &p, pklen))
- {
- ECerr(EC_F_ECKEY_PRIV_DECODE, EC_R_DECODE_ERROR);
- goto ecerr;
- }
-
- /* calculate public key (if necessary) */
- if (EC_KEY_get0_public_key(eckey) == NULL)
- {
- const BIGNUM *priv_key;
- const EC_GROUP *group;
- EC_POINT *pub_key;
- /* the public key was not included in the SEC1 private
- * key => calculate the public key */
- group = EC_KEY_get0_group(eckey);
- pub_key = EC_POINT_new(group);
- if (pub_key == NULL)
- {
- ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
- goto ecliberr;
- }
- if (!EC_POINT_copy(pub_key, EC_GROUP_get0_generator(group)))
- {
- EC_POINT_free(pub_key);
- ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
- goto ecliberr;
- }
- priv_key = EC_KEY_get0_private_key(eckey);
- if (!EC_POINT_mul(group, pub_key, priv_key, NULL, NULL, NULL))
- {
- EC_POINT_free(pub_key);
- ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
- goto ecliberr;
- }
- if (EC_KEY_set_public_key(eckey, pub_key) == 0)
- {
- EC_POINT_free(pub_key);
- ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
- goto ecliberr;
- }
- EC_POINT_free(pub_key);
- }
-
- EVP_PKEY_assign_EC_KEY(pkey, eckey);
- return 1;
-
- ecliberr:
- ECerr(EC_F_ECKEY_PRIV_DECODE, ERR_R_EC_LIB);
- ecerr:
- if (eckey)
- EC_KEY_free(eckey);
- return 0;
- }
+{
+ int r;
+ const EC_GROUP *group = EC_KEY_get0_group(b->pkey.ec);
+ const EC_POINT *pa = EC_KEY_get0_public_key(a->pkey.ec),
+ *pb = EC_KEY_get0_public_key(b->pkey.ec);
+ if (group == NULL || pa == NULL || pb == NULL)
+ return -2;
+ r = EC_POINT_cmp(group, pa, pb, NULL);
+ if (r == 0)
+ return 1;
+ if (r == 1)
+ return 0;
+ return -2;
+}
+
+static int eckey_priv_decode_with_libctx(EVP_PKEY *pkey,
+ const PKCS8_PRIV_KEY_INFO *p8,
+ OPENSSL_CTX *libctx,
+ const char *propq)
+{
+ const unsigned char *p = NULL;
+ const void *pval;
+ int ptype, pklen;
+ EC_KEY *eckey = NULL;
+ const X509_ALGOR *palg;
+
+ if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8))
+ return 0;
+ X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+ eckey = eckey_type2param(ptype, pval, libctx, propq);
+
+ if (eckey == NULL)
+ goto ecliberr;
+
+ /* We have parameters now set private key */
+ if (!d2i_ECPrivateKey(&eckey, &p, pklen)) {
+ ECerr(0, EC_R_DECODE_ERROR);
+ goto ecerr;
+ }
+
+ EVP_PKEY_assign_EC_KEY(pkey, eckey);
+ return 1;
+
+ ecliberr:
+ ECerr(0, ERR_R_EC_LIB);
+ ecerr:
+ EC_KEY_free(eckey);
+ return 0;
+}
static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
{
- EC_KEY *ec_key;
- unsigned char *ep, *p;
- int eplen, ptype;
- void *pval;
- unsigned int tmp_flags, old_flags;
-
- ec_key = pkey->pkey.ec;
-
- if (!eckey_param2type(&ptype, &pval, ec_key))
- {
- 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);
- tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
- EC_KEY_set_enc_flags(ec_key, tmp_flags);
- eplen = i2d_ECPrivateKey(ec_key, NULL);
- if (!eplen)
- {
- EC_KEY_set_enc_flags(ec_key, old_flags);
- ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
- return 0;
- }
- ep = (unsigned char *) OPENSSL_malloc(eplen);
- if (!ep)
- {
- EC_KEY_set_enc_flags(ec_key, old_flags);
- ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- p = ep;
- if (!i2d_ECPrivateKey(ec_key, &p))
- {
- EC_KEY_set_enc_flags(ec_key, old_flags);
- OPENSSL_free(ep);
- ECerr(EC_F_ECKEY_PRIV_ENCODE, ERR_R_EC_LIB);
- }
- /* restore old encoding flags */
- EC_KEY_set_enc_flags(ec_key, old_flags);
-
- if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(NID_X9_62_id_ecPublicKey), 0,
- ptype, pval, ep, eplen))
- return 0;
-
- return 1;
+ EC_KEY ec_key = *(pkey->pkey.ec);
+ unsigned char *ep, *p;
+ int eplen, ptype;
+ void *pval;
+ unsigned int old_flags;
+
+ if (!eckey_param2type(&ptype, &pval, &ec_key)) {
+ 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 = OPENSSL_malloc(eplen);
+ if (ep == NULL) {
+ 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);
- }
+{
+ 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;
- }
+{
+ return EC_GROUP_order_bits(EC_KEY_get0_group(pkey->pkey.ec));
+}
+
+static int ec_security_bits(const EVP_PKEY *pkey)
+{
+ int ecbits = ec_bits(pkey);
+ if (ecbits >= 512)
+ return 256;
+ if (ecbits >= 384)
+ return 192;
+ if (ecbits >= 256)
+ return 128;
+ if (ecbits >= 224)
+ return 112;
+ if (ecbits >= 160)
+ return 80;
+ return ecbits / 2;
+}
static int ec_missing_parameters(const EVP_PKEY *pkey)
- {
- if (EC_KEY_get0_group(pkey->pkey.ec) == NULL)
- return 1;
- return 0;
- }
-
-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;
- }
-
-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 (EC_GROUP_cmp(group_a, group_b, NULL))
- return 0;
- else
- return 1;
- }
+{
+ 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 (to->pkey.ec == NULL) {
+ to->pkey.ec = EC_KEY_new();
+ if (to->pkey.ec == NULL)
+ goto err;
+ }
+ if (EC_KEY_set_group(to->pkey.ec, group) == 0)
+ goto err;
+ EC_GROUP_free(group);
+ return 1;
+ err:
+ EC_GROUP_free(group);
+ return 0;
+}
+
+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 ((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);
- }
- else
-
- if (ktype == 2)
- {
- if ((i = (size_t)BN_num_bytes(priv_key)) > buf_len)
- buf_len = i;
- priv_key = EC_KEY_get0_private_key(x);
- }
- 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_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);
- }
+{
+ EC_KEY_free(pkey->pkey.ec);
+}
+
+typedef enum {
+ EC_KEY_PRINT_PRIVATE,
+ EC_KEY_PRINT_PUBLIC,
+ EC_KEY_PRINT_PARAM
+} ec_print_t;
+
+static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, ec_print_t ktype)
+{
+ const char *ecstr;
+ unsigned char *priv = NULL, *pub = NULL;
+ size_t privlen = 0, publen = 0;
+ int ret = 0;
+ const EC_GROUP *group;
+
+ if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
+ ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_PASSED_NULL_PARAMETER);
+ return 0;
+ }
+
+ if (ktype != EC_KEY_PRINT_PARAM && EC_KEY_get0_public_key(x) != NULL) {
+ publen = EC_KEY_key2buf(x, EC_KEY_get_conv_form(x), &pub, NULL);
+ if (publen == 0)
+ goto err;
+ }
+
+ if (ktype == EC_KEY_PRINT_PRIVATE && EC_KEY_get0_private_key(x) != NULL) {
+ privlen = EC_KEY_priv2buf(x, &priv);
+ if (privlen == 0)
+ goto err;
+ }
+
+ if (ktype == EC_KEY_PRINT_PRIVATE)
+ ecstr = "Private-Key";
+ else if (ktype == EC_KEY_PRINT_PUBLIC)
+ ecstr = "Public-Key";
+ else
+ ecstr = "ECDSA-Parameters";
+
+ if (!BIO_indent(bp, off, 128))
+ goto err;
+ if (BIO_printf(bp, "%s: (%d bit)\n", ecstr,
+ EC_GROUP_order_bits(group)) <= 0)
+ goto err;
+
+ if (privlen != 0) {
+ if (BIO_printf(bp, "%*spriv:\n", off, "") <= 0)
+ goto err;
+ if (ASN1_buf_print(bp, priv, privlen, off + 4) == 0)
+ goto err;
+ }
+
+ if (publen != 0) {
+ if (BIO_printf(bp, "%*spub:\n", off, "") <= 0)
+ goto err;
+ if (ASN1_buf_print(bp, pub, publen, off + 4) == 0)
+ goto err;
+ }
+
+ if (!ECPKParameters_print(bp, group, off))
+ goto err;
+ ret = 1;
+ err:
+ if (!ret)
+ ECerr(EC_F_DO_EC_KEY_PRINT, ERR_R_EC_LIB);
+ OPENSSL_clear_free(priv, privlen);
+ OPENSSL_free(pub);
+ 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)) == NULL) {
+ 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);
- }
+ ASN1_PCTX *ctx)
+{
+ return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PARAM);
+}
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);
- }
-
+ ASN1_PCTX *ctx)
+{
+ return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PUBLIC);
+}
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);
- }
-
-EVP_PKEY_ASN1_METHOD eckey_asn1_meth =
- {
- EVP_PKEY_EC,
- 0,
- 0,
-
- 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,
-
- 0,0,
- ec_missing_parameters,
- ec_copy_parameters,
- ec_cmp_parameters,
- eckey_param_print,
-
- int_ec_free,
- 0
- };
+ ASN1_PCTX *ctx)
+{
+ return do_EC_KEY_print(bp, pkey->pkey.ec, indent, EC_KEY_PRINT_PRIVATE);
+}
+
+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)) == NULL) {
+ 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:
+ if (EVP_PKEY_id(pkey) == EVP_PKEY_SM2) {
+ /* For SM2, the only valid digest-alg is SM3 */
+ *(int *)arg2 = NID_sm3;
+ return 2; /* Make it mandatory */
+ }
+ *(int *)arg2 = NID_sha256;
+ return 1;
+
+ case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
+ return EC_KEY_oct2key(EVP_PKEY_get0_EC_KEY(pkey), arg2, arg1, NULL);
+
+ case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
+ return EC_KEY_key2buf(EVP_PKEY_get0_EC_KEY(pkey),
+ POINT_CONVERSION_UNCOMPRESSED, arg2, NULL);
+
+ default:
+ return -2;
+
+ }
+
+}
+
+static int ec_pkey_check(const EVP_PKEY *pkey)
+{
+ EC_KEY *eckey = pkey->pkey.ec;
+
+ /* stay consistent to what EVP_PKEY_check demands */
+ if (eckey->priv_key == NULL) {
+ ECerr(EC_F_EC_PKEY_CHECK, EC_R_MISSING_PRIVATE_KEY);
+ return 0;
+ }
+
+ return EC_KEY_check_key(eckey);
+}
+
+static int ec_pkey_public_check(const EVP_PKEY *pkey)
+{
+ EC_KEY *eckey = pkey->pkey.ec;
+
+ /*
+ * Note: it unnecessary to check eckey->pub_key here since
+ * it will be checked in EC_KEY_check_key(). In fact, the
+ * EC_KEY_check_key() mainly checks the public key, and checks
+ * the private key optionally (only if there is one). So if
+ * someone passes a whole EC key (public + private), this
+ * will also work...
+ */
+
+ return EC_KEY_check_key(eckey);
+}
+
+static int ec_pkey_param_check(const EVP_PKEY *pkey)
+{
+ EC_KEY *eckey = pkey->pkey.ec;
+
+ /* stay consistent to what EVP_PKEY_check demands */
+ if (eckey->group == NULL) {
+ ECerr(EC_F_EC_PKEY_PARAM_CHECK, EC_R_MISSING_PARAMETERS);
+ return 0;
+ }
+
+ return EC_GROUP_check(eckey->group, NULL);
+}
+
+static
+size_t ec_pkey_dirty_cnt(const EVP_PKEY *pkey)
+{
+ return pkey->pkey.ec->dirty_cnt;
+}
+
+static ossl_inline
+int ecparams_to_params(const EC_KEY *eckey, OSSL_PARAM_BLD *tmpl)
+{
+ const EC_GROUP *ecg;
+ int curve_nid;
+
+ if (eckey == NULL)
+ return 0;
+
+ ecg = EC_KEY_get0_group(eckey);
+ if (ecg == NULL)
+ return 0;
+
+ curve_nid = EC_GROUP_get_curve_name(ecg);
+
+ if (curve_nid == NID_undef) {
+ /* explicit parameters */
+
+ /*
+ * TODO(3.0): should we support explicit parameters curves?
+ */
+ return 0;
+ } else {
+ /* named curve */
+ const char *curve_name = NULL;
+
+ if ((curve_name = OBJ_nid2sn(curve_nid)) == NULL)
+ return 0;
+
+ if (!OSSL_PARAM_BLD_push_utf8_string(tmpl, OSSL_PKEY_PARAM_GROUP_NAME, curve_name, 0))
+ return 0;
+ }
+
+ return 1;
+}
+
+static
+int ec_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
+ EVP_KEYMGMT *to_keymgmt, OPENSSL_CTX *libctx,
+ const char *propq)
+{
+ const EC_KEY *eckey = NULL;
+ const EC_GROUP *ecg = NULL;
+ unsigned char *pub_key_buf = NULL;
+ size_t pub_key_buflen;
+ OSSL_PARAM_BLD *tmpl;
+ OSSL_PARAM *params = NULL;
+ const BIGNUM *priv_key = NULL;
+ const EC_POINT *pub_point = NULL;
+ int selection = 0;
+ int rv = 0;
+ BN_CTX *bnctx = NULL;
+
+ if (from == NULL
+ || (eckey = from->pkey.ec) == NULL
+ || (ecg = EC_KEY_get0_group(eckey)) == NULL)
+ return 0;
+
+ /*
+ * If the EC_KEY method is foreign, then we can't be sure of anything,
+ * and can therefore not export or pretend to export.
+ */
+ if (EC_KEY_get_method(eckey) != EC_KEY_OpenSSL())
+ return 0;
+
+ tmpl = OSSL_PARAM_BLD_new();
+ if (tmpl == NULL)
+ return 0;
+
+ /* export the domain parameters */
+ if (!ecparams_to_params(eckey, tmpl))
+ goto err;
+ selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
+
+ priv_key = EC_KEY_get0_private_key(eckey);
+ pub_point = EC_KEY_get0_public_key(eckey);
+
+ if (pub_point != NULL) {
+ /*
+ * EC_POINT_point2buf() can generate random numbers in some
+ * implementations so we need to ensure we use the correct libctx.
+ */
+ bnctx = BN_CTX_new_ex(libctx);
+ if (bnctx == NULL)
+ goto err;
+
+ /* convert pub_point to a octet string according to the SECG standard */
+ if ((pub_key_buflen = EC_POINT_point2buf(ecg, pub_point,
+ POINT_CONVERSION_COMPRESSED,
+ &pub_key_buf, bnctx)) == 0
+ || !OSSL_PARAM_BLD_push_octet_string(tmpl,
+ OSSL_PKEY_PARAM_PUB_KEY,
+ pub_key_buf,
+ pub_key_buflen))
+ goto err;
+ selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
+ }
+
+ if (priv_key != NULL) {
+ size_t sz;
+ int ecbits;
+ int ecdh_cofactor_mode;
+
+ /*
+ * Key import/export should never leak the bit length of the secret
+ * scalar in the key.
+ *
+ * For this reason, on export we use padded BIGNUMs with fixed length.
+ *
+ * When importing we also should make sure that, even if short lived,
+ * the newly created BIGNUM is marked with the BN_FLG_CONSTTIME flag as
+ * soon as possible, so that any processing of this BIGNUM might opt for
+ * constant time implementations in the backend.
+ *
+ * Setting the BN_FLG_CONSTTIME flag alone is never enough, we also have
+ * to preallocate the BIGNUM internal buffer to a fixed public size big
+ * enough that operations performed during the processing never trigger
+ * a realloc which would leak the size of the scalar through memory
+ * accesses.
+ *
+ * Fixed Length
+ * ------------
+ *
+ * The order of the large prime subgroup of the curve is our choice for
+ * a fixed public size, as that is generally the upper bound for
+ * generating a private key in EC cryptosystems and should fit all valid
+ * secret scalars.
+ *
+ * For padding on export we just use the bit length of the order
+ * converted to bytes (rounding up).
+ *
+ * For preallocating the BIGNUM storage we look at the number of "words"
+ * required for the internal representation of the order, and we
+ * preallocate 2 extra "words" in case any of the subsequent processing
+ * might temporarily overflow the order length.
+ */
+ ecbits = EC_GROUP_order_bits(ecg);
+ if (ecbits <= 0)
+ goto err;
+
+ sz = (ecbits + 7 ) / 8;
+ if (!OSSL_PARAM_BLD_push_BN_pad(tmpl,
+ OSSL_PKEY_PARAM_PRIV_KEY,
+ priv_key, sz))
+ goto err;
+ selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
+
+ /*
+ * The ECDH Cofactor Mode is defined only if the EC_KEY actually
+ * contains a private key, so we check for the flag and export it only
+ * in this case.
+ */
+ ecdh_cofactor_mode =
+ (EC_KEY_get_flags(eckey) & EC_FLAG_COFACTOR_ECDH) ? 1 : 0;
+
+ /* Export the ECDH_COFACTOR_MODE parameter */
+ if (!OSSL_PARAM_BLD_push_int(tmpl,
+ OSSL_PKEY_PARAM_USE_COFACTOR_ECDH,
+ ecdh_cofactor_mode))
+ goto err;
+ selection |= OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS;
+ }
+
+ params = OSSL_PARAM_BLD_to_param(tmpl);
+
+ /* We export, the provider imports */
+ rv = evp_keymgmt_import(to_keymgmt, to_keydata, selection, params);
+
+ err:
+ OSSL_PARAM_BLD_free(tmpl);
+ OSSL_PARAM_BLD_free_params(params);
+ OPENSSL_free(pub_key_buf);
+ BN_CTX_free(bnctx);
+ return rv;
+}
+
+static int ec_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
+{
+ EVP_PKEY_CTX *pctx = vpctx;
+ EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
+ EC_KEY *ec = EC_KEY_new_with_libctx(pctx->libctx, pctx->propquery);
+
+ if (ec == NULL) {
+ ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ if (!ec_key_domparams_fromdata(ec, params)
+ || !ec_key_otherparams_fromdata(ec, params)
+ || !ec_key_fromdata(ec, params, 1)
+ || !EVP_PKEY_assign_EC_KEY(pkey, ec)) {
+ EC_KEY_free(ec);
+ return 0;
+ }
+ return 1;
+}
+
+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,
+
+ NULL,
+ eckey_priv_encode,
+ eckey_priv_print,
+
+ int_ec_size,
+ ec_bits,
+ ec_security_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,
+
+ 0, 0, 0,
+
+ ec_pkey_check,
+ ec_pkey_public_check,
+ ec_pkey_param_check,
+
+ 0, /* set_priv_key */
+ 0, /* set_pub_key */
+ 0, /* get_priv_key */
+ 0, /* get_pub_key */
+
+ ec_pkey_dirty_cnt,
+ ec_pkey_export_to,
+ ec_pkey_import_from,
+ eckey_priv_decode_with_libctx
+};
+
+#if !defined(OPENSSL_NO_SM2)
+const EVP_PKEY_ASN1_METHOD sm2_asn1_meth = {
+ EVP_PKEY_SM2,
+ EVP_PKEY_EC,
+ ASN1_PKEY_ALIAS
+};
+#endif
+
+int EC_KEY_print(BIO *bp, const EC_KEY *x, int off)
+{
+ int private = EC_KEY_get0_private_key(x) != NULL;
+
+ return do_EC_KEY_print(bp, x, off,
+ private ? EC_KEY_PRINT_PRIVATE : EC_KEY_PRINT_PUBLIC);
+}
+
+int ECParameters_print(BIO *bp, const EC_KEY *x)
+{
+ return do_EC_KEY_print(bp, x, 4, EC_KEY_PRINT_PARAM);
+}
+
+#ifndef OPENSSL_NO_CMS
+
+static int ecdh_cms_set_peerkey(EVP_PKEY_CTX *pctx,
+ X509_ALGOR *alg, ASN1_BIT_STRING *pubkey)
+{
+ const ASN1_OBJECT *aoid;
+ int atype;
+ const 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 == NULL)
+ goto err;
+ grp = EC_KEY_get0_group(pk->pkey.ec);
+ ecpeer = EC_KEY_new();
+ if (ecpeer == NULL)
+ goto err;
+ if (!EC_KEY_set_group(ecpeer, grp))
+ goto err;
+ } else {
+ ecpeer = eckey_type2param(atype, aval, pctx->libctx, pctx->propquery);
+ if (!ecpeer)
+ goto err;
+ }
+ /* We have parameters now set public key */
+ plen = ASN1_STRING_length(pubkey);
+ p = ASN1_STRING_get0_data(pubkey);
+ if (p == NULL || plen == 0)
+ goto err;
+ if (!o2i_ECPublicKey(&ecpeer, &p, plen))
+ goto err;
+ pkpeer = EVP_PKEY_new();
+ if (pkpeer == NULL)
+ goto err;
+ EVP_PKEY_set1_EC_KEY(pkpeer, ecpeer);
+ if (EVP_PKEY_derive_set_peer(pctx, pkpeer) > 0)
+ rv = 1;
+ err:
+ EC_KEY_free(ecpeer);
+ 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_63) <= 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:
+ X509_ALGOR_free(kekalg);
+ 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;
+ const 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 == NULL)
+ 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 parameters 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_63;
+ if (EVP_PKEY_CTX_set_ecdh_kdf_type(pctx, kdf_type) <= 0)
+ goto err;
+ } else
+ /* Unknown 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 == NULL)
+ goto err;
+ wrap_alg->algorithm = OBJ_nid2obj(wrap_nid);
+ wrap_alg->parameter = ASN1_TYPE_new();
+ if (wrap_alg->parameter == NULL)
+ 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 == NULL)
+ 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:
+ OPENSSL_free(penc);
+ X509_ALGOR_free(wrap_alg);
+ return rv;
+}
+
+#endif
projects / openssl.git / blobdiff