239a0abfd5
There are all the type-specific serializations rather than something tagged with a type. i2d_PrivateKey's PKCS#8 codepath was unreachable because every EVP_PKEY type has an old_priv_encode function. To prune EVP_PKEY_ASN1_METHOD further, replace i2d_PrivateKey into a switch case so we don't need to keep old_priv_encode around. This cuts down on a case of outside modules reaching into crypto/evp method tables. Change-Id: I30db2eed836d560056ba9d1425b960d0602c3cf2 Reviewed-on: https://boringssl-review.googlesource.com/6865 Reviewed-by: Adam Langley <agl@google.com>
496 lines
13 KiB
C
496 lines
13 KiB
C
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2006.
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*/
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/* ====================================================================
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* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com). */
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#include <openssl/evp.h>
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#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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#include <openssl/bytestring.h>
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#include <openssl/ec.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 <openssl/x509.h>
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#include "internal.h"
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static int eckey_param2type(int *pptype, void **ppval, EC_KEY *ec_key) {
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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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OPENSSL_PUT_ERROR(EVP, EVP_R_MISSING_PARAMETERS);
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return 0;
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}
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nid = EC_GROUP_get_curve_name(group);
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if (nid == NID_undef) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_NO_NID_FOR_CURVE);
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return 0;
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}
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*ppval = (void*) OBJ_nid2obj(nid);
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*pptype = V_ASN1_OBJECT;
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return 1;
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}
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static int eckey_pub_encode(CBB *out, const EVP_PKEY *key) {
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const EC_KEY *ec_key = key->pkey.ec;
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const EC_GROUP *group = EC_KEY_get0_group(ec_key);
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int curve_nid = EC_GROUP_get_curve_name(group);
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if (curve_nid == NID_undef) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_NO_NID_FOR_CURVE);
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return 0;
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}
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const EC_POINT *public_key = EC_KEY_get0_public_key(ec_key);
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/* See RFC 5480, section 2. */
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CBB spki, algorithm, key_bitstring;
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if (!CBB_add_asn1(out, &spki, CBS_ASN1_SEQUENCE) ||
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!CBB_add_asn1(&spki, &algorithm, CBS_ASN1_SEQUENCE) ||
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!OBJ_nid2cbb(&algorithm, NID_X9_62_id_ecPublicKey) ||
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!OBJ_nid2cbb(&algorithm, curve_nid) ||
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!CBB_add_asn1(&spki, &key_bitstring, CBS_ASN1_BITSTRING) ||
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!CBB_add_u8(&key_bitstring, 0 /* padding */) ||
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!EC_POINT_point2cbb(&key_bitstring, group, public_key,
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POINT_CONVERSION_UNCOMPRESSED, NULL) ||
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!CBB_flush(out)) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_ENCODE_ERROR);
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return 0;
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}
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return 1;
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}
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static int eckey_pub_decode(EVP_PKEY *out, CBS *params, CBS *key) {
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/* See RFC 5480, section 2. */
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/* The parameters are a named curve. */
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CBS named_curve;
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if (!CBS_get_asn1(params, &named_curve, CBS_ASN1_OBJECT) ||
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CBS_len(params) != 0) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
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return 0;
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}
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EC_KEY *eckey = EC_KEY_new_by_curve_name(OBJ_cbs2nid(&named_curve));
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if (eckey == NULL) {
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return 0;
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}
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EC_POINT *point = EC_POINT_new(EC_KEY_get0_group(eckey));
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if (point == NULL ||
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!EC_POINT_oct2point(EC_KEY_get0_group(eckey), point, CBS_data(key),
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CBS_len(key), NULL) ||
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!EC_KEY_set_public_key(eckey, point)) {
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goto err;
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}
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EC_POINT_free(point);
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EVP_PKEY_assign_EC_KEY(out, eckey);
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return 1;
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err:
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EC_POINT_free(point);
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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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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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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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} else if (r == 1) {
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return 0;
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} else {
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return -2;
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}
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}
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static EC_KEY *eckey_type2param(int ptype, void *pval) {
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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 uint8_t *pm = pstr->data;
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int pmlen = pstr->length;
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eckey = d2i_ECParameters(NULL, &pm, pmlen);
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if (eckey == NULL) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
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goto err;
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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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/* type == V_ASN1_OBJECT => the parameters are given
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* by an asn1 OID */
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eckey = EC_KEY_new_by_curve_name(OBJ_obj2nid(poid));
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if (eckey == NULL) {
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goto err;
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}
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} else {
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OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
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goto err;
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}
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return eckey;
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err:
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if (eckey) {
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EC_KEY_free(eckey);
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}
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return NULL;
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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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const uint8_t *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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}
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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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}
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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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OPENSSL_PUT_ERROR(EVP, EVP_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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ecliberr:
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OPENSSL_PUT_ERROR(EVP, ERR_R_EC_LIB);
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ecerr:
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if (eckey) {
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EC_KEY_free(eckey);
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}
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return 0;
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}
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static int eckey_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey) {
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EC_KEY *ec_key;
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uint8_t *ep, *p;
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int eplen, ptype;
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void *pval;
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unsigned int tmp_flags, old_flags;
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ec_key = pkey->pkey.ec;
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if (!eckey_param2type(&ptype, &pval, ec_key)) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
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return 0;
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}
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/* set the private key */
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/* do not include the parameters in the SEC1 private key
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* see PKCS#11 12.11 */
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old_flags = EC_KEY_get_enc_flags(ec_key);
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tmp_flags = old_flags | EC_PKEY_NO_PARAMETERS;
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EC_KEY_set_enc_flags(ec_key, tmp_flags);
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eplen = i2d_ECPrivateKey(ec_key, NULL);
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if (!eplen) {
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EC_KEY_set_enc_flags(ec_key, old_flags);
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OPENSSL_PUT_ERROR(EVP, ERR_R_EC_LIB);
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return 0;
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}
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ep = OPENSSL_malloc(eplen);
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if (!ep) {
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EC_KEY_set_enc_flags(ec_key, old_flags);
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OPENSSL_PUT_ERROR(EVP, ERR_R_MALLOC_FAILURE);
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return 0;
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}
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p = ep;
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if (!i2d_ECPrivateKey(ec_key, &p)) {
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EC_KEY_set_enc_flags(ec_key, old_flags);
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OPENSSL_free(ep);
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OPENSSL_PUT_ERROR(EVP, ERR_R_EC_LIB);
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return 0;
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}
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/* restore old encoding flags */
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EC_KEY_set_enc_flags(ec_key, old_flags);
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if (!PKCS8_pkey_set0(p8, (ASN1_OBJECT *)OBJ_nid2obj(NID_X9_62_id_ecPublicKey),
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0, ptype, pval, ep, eplen)) {
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OPENSSL_free(ep);
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return 0;
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}
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return 1;
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}
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static int int_ec_size(const EVP_PKEY *pkey) {
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return ECDSA_size(pkey->pkey.ec);
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}
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static int ec_bits(const EVP_PKEY *pkey) {
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const EC_GROUP *group = EC_KEY_get0_group(pkey->pkey.ec);
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if (group == NULL) {
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ERR_clear_error();
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return 0;
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}
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return BN_num_bits(EC_GROUP_get0_order(group));
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}
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static int ec_missing_parameters(const EVP_PKEY *pkey) {
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return EC_KEY_get0_group(pkey->pkey.ec) == NULL;
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}
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static int ec_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from) {
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EC_GROUP *group = EC_GROUP_dup(EC_KEY_get0_group(from->pkey.ec));
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if (group == NULL ||
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EC_KEY_set_group(to->pkey.ec, group) == 0) {
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return 0;
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}
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EC_GROUP_free(group);
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return 1;
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}
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static int ec_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b) {
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const EC_GROUP *group_a = EC_KEY_get0_group(a->pkey.ec),
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*group_b = EC_KEY_get0_group(b->pkey.ec);
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if (EC_GROUP_cmp(group_a, group_b, NULL) != 0) {
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/* mismatch */
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return 0;
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}
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return 1;
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}
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static void int_ec_free(EVP_PKEY *pkey) { EC_KEY_free(pkey->pkey.ec); }
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static int do_EC_KEY_print(BIO *bp, const EC_KEY *x, int off, int ktype) {
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uint8_t *buffer = NULL;
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const char *ecstr;
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size_t buf_len = 0, i;
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int ret = 0, reason = ERR_R_BIO_LIB;
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BN_CTX *ctx = NULL;
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const EC_GROUP *group;
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const EC_POINT *public_key;
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const BIGNUM *priv_key;
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uint8_t *pub_key_bytes = NULL;
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size_t pub_key_bytes_len = 0;
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if (x == NULL || (group = EC_KEY_get0_group(x)) == NULL) {
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reason = ERR_R_PASSED_NULL_PARAMETER;
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goto err;
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}
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ctx = BN_CTX_new();
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if (ctx == NULL) {
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reason = ERR_R_MALLOC_FAILURE;
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goto err;
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}
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if (ktype > 0) {
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public_key = EC_KEY_get0_public_key(x);
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if (public_key != NULL) {
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pub_key_bytes_len = EC_POINT_point2oct(
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group, public_key, EC_KEY_get_conv_form(x), NULL, 0, ctx);
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if (pub_key_bytes_len == 0) {
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reason = ERR_R_MALLOC_FAILURE;
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goto err;
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}
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pub_key_bytes = OPENSSL_malloc(pub_key_bytes_len);
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if (pub_key_bytes == NULL) {
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reason = ERR_R_MALLOC_FAILURE;
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goto err;
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}
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pub_key_bytes_len =
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EC_POINT_point2oct(group, public_key, EC_KEY_get_conv_form(x),
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pub_key_bytes, pub_key_bytes_len, ctx);
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if (pub_key_bytes_len == 0) {
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reason = ERR_R_MALLOC_FAILURE;
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goto err;
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}
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buf_len = pub_key_bytes_len;
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}
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}
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if (ktype == 2) {
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priv_key = EC_KEY_get0_private_key(x);
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if (priv_key && (i = (size_t)BN_num_bytes(priv_key)) > buf_len) {
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buf_len = i;
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}
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} else {
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priv_key = NULL;
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}
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if (ktype > 0) {
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buf_len += 10;
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if ((buffer = OPENSSL_malloc(buf_len)) == NULL) {
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reason = ERR_R_MALLOC_FAILURE;
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goto err;
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}
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}
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if (ktype == 2) {
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ecstr = "Private-Key";
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} else if (ktype == 1) {
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ecstr = "Public-Key";
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} else {
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ecstr = "ECDSA-Parameters";
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}
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if (!BIO_indent(bp, off, 128)) {
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goto err;
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}
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const BIGNUM *order = EC_GROUP_get0_order(group);
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if (BIO_printf(bp, "%s: (%d bit)\n", ecstr, BN_num_bits(order)) <= 0) {
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goto err;
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}
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if ((priv_key != NULL) &&
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!ASN1_bn_print(bp, "priv:", priv_key, buffer, off)) {
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goto err;
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}
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if (pub_key_bytes != NULL) {
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BIO_hexdump(bp, pub_key_bytes, pub_key_bytes_len, off);
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}
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/* TODO(fork): implement */
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/*
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if (!ECPKParameters_print(bp, group, off))
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goto err; */
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ret = 1;
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err:
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if (!ret) {
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OPENSSL_PUT_ERROR(EVP, reason);
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}
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OPENSSL_free(pub_key_bytes);
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BN_CTX_free(ctx);
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OPENSSL_free(buffer);
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return ret;
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}
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static int eckey_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx) {
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return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 0);
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}
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static int eckey_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx) {
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return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 1);
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}
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static int eckey_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
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ASN1_PCTX *ctx) {
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return do_EC_KEY_print(bp, pkey->pkey.ec, indent, 2);
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}
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static int eckey_opaque(const EVP_PKEY *pkey) {
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return EC_KEY_is_opaque(pkey->pkey.ec);
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}
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static int old_ec_priv_decode(EVP_PKEY *pkey, const uint8_t **pder,
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int derlen) {
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EC_KEY *ec;
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if (!(ec = d2i_ECPrivateKey(NULL, pder, derlen))) {
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OPENSSL_PUT_ERROR(EVP, EVP_R_DECODE_ERROR);
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return 0;
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}
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EVP_PKEY_assign_EC_KEY(pkey, ec);
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return 1;
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}
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const EVP_PKEY_ASN1_METHOD ec_asn1_meth = {
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EVP_PKEY_EC,
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0,
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"EC",
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eckey_pub_decode,
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eckey_pub_encode,
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eckey_pub_cmp,
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eckey_pub_print,
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|
|
eckey_priv_decode,
|
|
eckey_priv_encode,
|
|
eckey_priv_print,
|
|
|
|
eckey_opaque,
|
|
0 /* pkey_supports_digest */,
|
|
|
|
int_ec_size,
|
|
ec_bits,
|
|
|
|
ec_missing_parameters,
|
|
ec_copy_parameters,
|
|
ec_cmp_parameters,
|
|
eckey_param_print,
|
|
0,
|
|
|
|
int_ec_free,
|
|
old_ec_priv_decode,
|
|
|
|
NULL /* digest_verify_init_from_algorithm */,
|
|
NULL /* digest_sign_algorithm */,
|
|
};
|