7743c026cb
RFC 5915 requires the use of the I2OSP primitive as defined in RFC 3447 for encoding ECPrivateKey. Fix this and add a test. See also upstream's 30cd4ff294252c4b6a4b69cbef6a5b4117705d22, though it mixes up degree and order. Change-Id: I81ba14da3c8d69e3799422c669fab7f16956f322 Reviewed-on: https://boringssl-review.googlesource.com/4469 Reviewed-by: Adam Langley <agl@google.com>
593 lines
17 KiB
C
593 lines
17 KiB
C
/* Written by Nils Larsch for the OpenSSL project. */
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/* ====================================================================
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* Copyright (c) 2000-2003 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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#include <openssl/ec.h>
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/mem.h>
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#include <openssl/obj.h>
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#include "internal.h"
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typedef struct x9_62_fieldid_st {
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ASN1_OBJECT *fieldType;
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union {
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char *ptr;
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/* NID_X9_62_prime_field */
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ASN1_INTEGER *prime;
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/* anything else */
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ASN1_TYPE *other;
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} p;
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} X9_62_FIELDID;
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ASN1_ADB_TEMPLATE(fieldID_def) = ASN1_SIMPLE(X9_62_FIELDID, p.other, ASN1_ANY);
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ASN1_ADB(X9_62_FIELDID) = {
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ADB_ENTRY(NID_X9_62_prime_field, ASN1_SIMPLE(X9_62_FIELDID, p.prime, ASN1_INTEGER)),
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} ASN1_ADB_END(X9_62_FIELDID, 0, fieldType, 0, &fieldID_def_tt, NULL);
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ASN1_SEQUENCE(X9_62_FIELDID) = {
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ASN1_SIMPLE(X9_62_FIELDID, fieldType, ASN1_OBJECT),
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ASN1_ADB_OBJECT(X9_62_FIELDID)
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} ASN1_SEQUENCE_END(X9_62_FIELDID);
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typedef struct x9_62_curve_st {
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ASN1_OCTET_STRING *a;
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ASN1_OCTET_STRING *b;
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ASN1_BIT_STRING *seed;
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} X9_62_CURVE;
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ASN1_SEQUENCE(X9_62_CURVE) = {
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ASN1_SIMPLE(X9_62_CURVE, a, ASN1_OCTET_STRING),
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ASN1_SIMPLE(X9_62_CURVE, b, ASN1_OCTET_STRING),
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ASN1_OPT(X9_62_CURVE, seed, ASN1_BIT_STRING)
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} ASN1_SEQUENCE_END(X9_62_CURVE);
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typedef struct ec_parameters_st {
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long version;
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X9_62_FIELDID *fieldID;
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X9_62_CURVE *curve;
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ASN1_OCTET_STRING *base;
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ASN1_INTEGER *order;
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ASN1_INTEGER *cofactor;
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} ECPARAMETERS;
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DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS);
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ASN1_SEQUENCE(ECPARAMETERS) = {
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ASN1_SIMPLE(ECPARAMETERS, version, LONG),
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ASN1_SIMPLE(ECPARAMETERS, fieldID, X9_62_FIELDID),
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ASN1_SIMPLE(ECPARAMETERS, curve, X9_62_CURVE),
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ASN1_SIMPLE(ECPARAMETERS, base, ASN1_OCTET_STRING),
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ASN1_SIMPLE(ECPARAMETERS, order, ASN1_INTEGER),
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ASN1_OPT(ECPARAMETERS, cofactor, ASN1_INTEGER)
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} ASN1_SEQUENCE_END(ECPARAMETERS);
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IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS);
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typedef struct ecpk_parameters_st {
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int type;
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union {
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ASN1_OBJECT *named_curve;
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ECPARAMETERS *parameters;
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} value;
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} ECPKPARAMETERS;
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/* SEC1 ECPrivateKey */
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typedef struct ec_privatekey_st {
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long version;
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ASN1_OCTET_STRING *privateKey;
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ECPKPARAMETERS *parameters;
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ASN1_BIT_STRING *publicKey;
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} EC_PRIVATEKEY;
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DECLARE_ASN1_FUNCTIONS_const(ECPKPARAMETERS);
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DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECPKPARAMETERS, ECPKPARAMETERS);
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ASN1_CHOICE(ECPKPARAMETERS) = {
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ASN1_SIMPLE(ECPKPARAMETERS, value.named_curve, ASN1_OBJECT),
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ASN1_SIMPLE(ECPKPARAMETERS, value.parameters, ECPARAMETERS),
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} ASN1_CHOICE_END(ECPKPARAMETERS);
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IMPLEMENT_ASN1_FUNCTIONS_const(ECPKPARAMETERS);
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DECLARE_ASN1_FUNCTIONS_const(EC_PRIVATEKEY);
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DECLARE_ASN1_ENCODE_FUNCTIONS_const(EC_PRIVATEKEY, EC_PRIVATEKEY);
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ASN1_SEQUENCE(EC_PRIVATEKEY) = {
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ASN1_SIMPLE(EC_PRIVATEKEY, version, LONG),
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ASN1_SIMPLE(EC_PRIVATEKEY, privateKey, ASN1_OCTET_STRING),
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ASN1_EXP_OPT(EC_PRIVATEKEY, parameters, ECPKPARAMETERS, 0),
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ASN1_EXP_OPT(EC_PRIVATEKEY, publicKey, ASN1_BIT_STRING, 1),
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} ASN1_SEQUENCE_END(EC_PRIVATEKEY);
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IMPLEMENT_ASN1_FUNCTIONS_const(EC_PRIVATEKEY);
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ECPKPARAMETERS *ec_asn1_group2pkparameters(const EC_GROUP *group,
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ECPKPARAMETERS *params) {
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int ok = 0, nid;
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ECPKPARAMETERS *ret = params;
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if (ret == NULL) {
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ret = ECPKPARAMETERS_new();
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if (ret == NULL) {
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OPENSSL_PUT_ERROR(EC, ec_asn1_group2pkparameters, ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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} else {
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if (ret->value.named_curve) {
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ASN1_OBJECT_free(ret->value.named_curve);
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}
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}
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/* use the ASN.1 OID to describe the the elliptic curve parameters. */
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nid = EC_GROUP_get_curve_name(group);
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if (nid) {
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ret->type = 0;
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ret->value.named_curve = (ASN1_OBJECT*) OBJ_nid2obj(nid);
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ok = ret->value.named_curve != NULL;
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}
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if (!ok) {
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ECPKPARAMETERS_free(ret);
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return NULL;
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}
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return ret;
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}
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EC_GROUP *ec_asn1_pkparameters2group(const ECPKPARAMETERS *params) {
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EC_GROUP *ret = NULL;
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int nid = NID_undef;
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if (params == NULL) {
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OPENSSL_PUT_ERROR(EC, ec_asn1_pkparameters2group, EC_R_MISSING_PARAMETERS);
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return NULL;
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}
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if (params->type == 0) {
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nid = OBJ_obj2nid(params->value.named_curve);
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} else if (params->type == 1) {
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/* We don't support arbitary curves so we attempt to recognise it from the
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* group order. */
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const ECPARAMETERS *ecparams = params->value.parameters;
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unsigned i;
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const struct built_in_curve *curve;
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for (i = 0; OPENSSL_built_in_curves[i].nid != NID_undef; i++) {
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curve = &OPENSSL_built_in_curves[i];
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const unsigned param_len = curve->data->param_len;
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if (ecparams->order->length == param_len &&
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memcmp(ecparams->order->data, &curve->data->data[param_len * 5],
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param_len) == 0) {
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nid = curve->nid;
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break;
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}
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}
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}
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if (nid == NID_undef) {
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OPENSSL_PUT_ERROR(EC, ec_asn1_pkparameters2group, EC_R_NON_NAMED_CURVE);
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return NULL;
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}
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ret = EC_GROUP_new_by_curve_name(nid);
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if (ret == NULL) {
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OPENSSL_PUT_ERROR(EC, ec_asn1_pkparameters2group,
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EC_R_EC_GROUP_NEW_BY_NAME_FAILURE);
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return NULL;
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}
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return ret;
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}
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static EC_GROUP *d2i_ECPKParameters(EC_GROUP **groupp, const uint8_t **inp,
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long len) {
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EC_GROUP *group = NULL;
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ECPKPARAMETERS *params = NULL;
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params = d2i_ECPKPARAMETERS(NULL, inp, len);
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if (params == NULL) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPKParameters, EC_R_D2I_ECPKPARAMETERS_FAILURE);
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ECPKPARAMETERS_free(params);
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return NULL;
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}
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group = ec_asn1_pkparameters2group(params);
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if (group == NULL) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPKParameters, EC_R_PKPARAMETERS2GROUP_FAILURE);
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ECPKPARAMETERS_free(params);
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return NULL;
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}
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if (groupp && *groupp) {
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EC_GROUP_free(*groupp);
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}
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if (groupp) {
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*groupp = group;
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}
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ECPKPARAMETERS_free(params);
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return group;
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}
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static int i2d_ECPKParameters(const EC_GROUP *group, uint8_t **outp) {
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int ret = 0;
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ECPKPARAMETERS *tmp = ec_asn1_group2pkparameters(group, NULL);
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if (tmp == NULL) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPKParameters, EC_R_GROUP2PKPARAMETERS_FAILURE);
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return 0;
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}
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ret = i2d_ECPKPARAMETERS(tmp, outp);
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if (ret == 0) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPKParameters, EC_R_I2D_ECPKPARAMETERS_FAILURE);
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ECPKPARAMETERS_free(tmp);
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return 0;
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}
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ECPKPARAMETERS_free(tmp);
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return ret;
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}
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EC_KEY *d2i_ECPrivateKey(EC_KEY **a, const uint8_t **in, long len) {
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int ok = 0;
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EC_KEY *ret = NULL;
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EC_PRIVATEKEY *priv_key = NULL;
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priv_key = d2i_EC_PRIVATEKEY(NULL, in, len);
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if (priv_key == NULL) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, ERR_R_EC_LIB);
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return NULL;
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}
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if (a == NULL || *a == NULL) {
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ret = EC_KEY_new();
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if (ret == NULL) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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} else {
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ret = *a;
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}
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if (priv_key->parameters) {
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if (ret->group) {
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EC_GROUP_free(ret->group);
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}
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ret->group = ec_asn1_pkparameters2group(priv_key->parameters);
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}
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if (ret->group == NULL) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, ERR_R_EC_LIB);
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goto err;
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}
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ret->version = priv_key->version;
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if (priv_key->privateKey) {
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ret->priv_key =
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BN_bin2bn(M_ASN1_STRING_data(priv_key->privateKey),
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M_ASN1_STRING_length(priv_key->privateKey), ret->priv_key);
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if (ret->priv_key == NULL) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, ERR_R_BN_LIB);
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goto err;
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}
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} else {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, EC_R_MISSING_PRIVATE_KEY);
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goto err;
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}
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if (ret->pub_key) {
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EC_POINT_free(ret->pub_key);
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}
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ret->pub_key = EC_POINT_new(ret->group);
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if (ret->pub_key == NULL) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, ERR_R_EC_LIB);
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goto err;
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}
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if (priv_key->publicKey) {
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const uint8_t *pub_oct;
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int pub_oct_len;
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pub_oct = M_ASN1_STRING_data(priv_key->publicKey);
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pub_oct_len = M_ASN1_STRING_length(priv_key->publicKey);
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/* The first byte (the point conversion form) must be present. */
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if (pub_oct_len <= 0) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, EC_R_BUFFER_TOO_SMALL);
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goto err;
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}
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/* Save the point conversion form. */
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ret->conv_form = (point_conversion_form_t)(pub_oct[0] & ~0x01);
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if (!EC_POINT_oct2point(ret->group, ret->pub_key, pub_oct, pub_oct_len,
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NULL)) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, ERR_R_EC_LIB);
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goto err;
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}
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} else {
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if (!EC_POINT_mul(ret->group, ret->pub_key, ret->priv_key, NULL, NULL,
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NULL)) {
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OPENSSL_PUT_ERROR(EC, d2i_ECPrivateKey, ERR_R_EC_LIB);
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goto err;
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}
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/* Remember the original private-key-only encoding. */
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ret->enc_flag |= EC_PKEY_NO_PUBKEY;
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}
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if (a) {
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*a = ret;
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}
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ok = 1;
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err:
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if (!ok) {
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if (ret && (a == NULL || *a != ret)) {
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EC_KEY_free(ret);
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}
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ret = NULL;
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}
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if (priv_key) {
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EC_PRIVATEKEY_free(priv_key);
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}
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return ret;
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}
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int i2d_ECPrivateKey(const EC_KEY *key, uint8_t **outp) {
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int ret = 0, ok = 0;
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uint8_t *buffer = NULL;
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size_t buf_len = 0, tmp_len;
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EC_PRIVATEKEY *priv_key = NULL;
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if (key == NULL || key->group == NULL || key->priv_key == NULL) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_PASSED_NULL_PARAMETER);
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goto err;
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}
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priv_key = EC_PRIVATEKEY_new();
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if (priv_key == NULL) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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priv_key->version = key->version;
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buf_len = BN_num_bytes(&key->group->order);
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buffer = OPENSSL_malloc(buf_len);
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if (buffer == NULL) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!BN_bn2bin_padded(buffer, buf_len, key->priv_key)) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_BN_LIB);
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goto err;
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}
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if (!M_ASN1_OCTET_STRING_set(priv_key->privateKey, buffer, buf_len)) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_ASN1_LIB);
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goto err;
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}
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/* TODO(fork): replace this flexibility with key sensible default? */
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if (!(key->enc_flag & EC_PKEY_NO_PARAMETERS)) {
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if ((priv_key->parameters = ec_asn1_group2pkparameters(
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key->group, priv_key->parameters)) == NULL) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_EC_LIB);
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goto err;
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}
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}
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/* TODO(fork): replace this flexibility with key sensible default? */
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if (!(key->enc_flag & EC_PKEY_NO_PUBKEY) && key->pub_key != NULL) {
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priv_key->publicKey = M_ASN1_BIT_STRING_new();
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if (priv_key->publicKey == NULL) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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tmp_len = EC_POINT_point2oct(key->group, key->pub_key, key->conv_form, NULL,
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0, NULL);
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if (tmp_len > buf_len) {
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uint8_t *tmp_buffer = OPENSSL_realloc(buffer, tmp_len);
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if (!tmp_buffer) {
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OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_MALLOC_FAILURE);
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goto err;
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}
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buffer = tmp_buffer;
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buf_len = tmp_len;
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}
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if (!EC_POINT_point2oct(key->group, key->pub_key, key->conv_form, buffer,
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buf_len, NULL)) {
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|
OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_EC_LIB);
|
|
goto err;
|
|
}
|
|
|
|
priv_key->publicKey->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
|
|
priv_key->publicKey->flags |= ASN1_STRING_FLAG_BITS_LEFT;
|
|
if (!M_ASN1_BIT_STRING_set(priv_key->publicKey, buffer, buf_len)) {
|
|
OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_ASN1_LIB);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
ret = i2d_EC_PRIVATEKEY(priv_key, outp);
|
|
if (ret == 0) {
|
|
OPENSSL_PUT_ERROR(EC, i2d_ECPrivateKey, ERR_R_EC_LIB);
|
|
goto err;
|
|
}
|
|
ok = 1;
|
|
|
|
err:
|
|
if (buffer) {
|
|
OPENSSL_free(buffer);
|
|
}
|
|
if (priv_key) {
|
|
EC_PRIVATEKEY_free(priv_key);
|
|
}
|
|
return (ok ? ret : 0);
|
|
}
|
|
|
|
int i2d_ECParameters(const EC_KEY *key, uint8_t **outp) {
|
|
if (key == NULL) {
|
|
OPENSSL_PUT_ERROR(EC, i2d_ECParameters, ERR_R_PASSED_NULL_PARAMETER);
|
|
return 0;
|
|
}
|
|
return i2d_ECPKParameters(key->group, outp);
|
|
}
|
|
|
|
EC_KEY *d2i_ECParameters(EC_KEY **key, const uint8_t **inp, long len) {
|
|
EC_KEY *ret;
|
|
|
|
if (inp == NULL || *inp == NULL) {
|
|
OPENSSL_PUT_ERROR(EC, d2i_ECParameters, ERR_R_PASSED_NULL_PARAMETER);
|
|
return NULL;
|
|
}
|
|
|
|
if (key == NULL || *key == NULL) {
|
|
ret = EC_KEY_new();
|
|
if (ret == NULL) {
|
|
OPENSSL_PUT_ERROR(EC, d2i_ECParameters, ERR_R_MALLOC_FAILURE);
|
|
return NULL;
|
|
}
|
|
} else {
|
|
ret = *key;
|
|
}
|
|
|
|
if (!d2i_ECPKParameters(&ret->group, inp, len)) {
|
|
OPENSSL_PUT_ERROR(EC, d2i_ECParameters, ERR_R_EC_LIB);
|
|
if (key == NULL || *key == NULL) {
|
|
EC_KEY_free(ret);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
if (key) {
|
|
*key = ret;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
EC_KEY *o2i_ECPublicKey(EC_KEY **keyp, const uint8_t **inp, long len) {
|
|
EC_KEY *ret = NULL;
|
|
|
|
if (keyp == NULL || *keyp == NULL || (*keyp)->group == NULL) {
|
|
OPENSSL_PUT_ERROR(EC, o2i_ECPublicKey, ERR_R_PASSED_NULL_PARAMETER);
|
|
return 0;
|
|
}
|
|
ret = *keyp;
|
|
if (ret->pub_key == NULL &&
|
|
(ret->pub_key = EC_POINT_new(ret->group)) == NULL) {
|
|
OPENSSL_PUT_ERROR(EC, o2i_ECPublicKey, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
if (!EC_POINT_oct2point(ret->group, ret->pub_key, *inp, len, NULL)) {
|
|
OPENSSL_PUT_ERROR(EC, o2i_ECPublicKey, ERR_R_EC_LIB);
|
|
return 0;
|
|
}
|
|
/* save the point conversion form */
|
|
ret->conv_form = (point_conversion_form_t)(*inp[0] & ~0x01);
|
|
*inp += len;
|
|
return ret;
|
|
}
|
|
|
|
int i2o_ECPublicKey(const EC_KEY *key, uint8_t **outp) {
|
|
size_t buf_len = 0;
|
|
int new_buffer = 0;
|
|
|
|
if (key == NULL) {
|
|
OPENSSL_PUT_ERROR(EC, i2o_ECPublicKey, ERR_R_PASSED_NULL_PARAMETER);
|
|
return 0;
|
|
}
|
|
|
|
buf_len = EC_POINT_point2oct(key->group, key->pub_key, key->conv_form, NULL,
|
|
0, NULL);
|
|
|
|
if (outp == NULL || buf_len == 0) {
|
|
/* out == NULL => just return the length of the octet string */
|
|
return buf_len;
|
|
}
|
|
|
|
if (*outp == NULL) {
|
|
*outp = OPENSSL_malloc(buf_len);
|
|
if (*outp == NULL) {
|
|
OPENSSL_PUT_ERROR(EC, i2o_ECPublicKey, ERR_R_MALLOC_FAILURE);
|
|
return 0;
|
|
}
|
|
new_buffer = 1;
|
|
}
|
|
if (!EC_POINT_point2oct(key->group, key->pub_key, key->conv_form, *outp,
|
|
buf_len, NULL)) {
|
|
OPENSSL_PUT_ERROR(EC, i2o_ECPublicKey, ERR_R_EC_LIB);
|
|
if (new_buffer) {
|
|
OPENSSL_free(*outp);
|
|
*outp = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
if (!new_buffer) {
|
|
*outp += buf_len;
|
|
}
|
|
return buf_len;
|
|
}
|