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