[331] | 1 | /*
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| 2 | * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /* ====================================================================
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| 11 | * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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| 12 | * Portions originally developed by SUN MICROSYSTEMS, INC., and
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| 13 | * contributed to the OpenSSL project.
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| 14 | */
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| 15 |
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| 16 | #include <internal/cryptlib.h>
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| 17 | #include <string.h>
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| 18 | #include "ec_lcl.h"
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| 19 | #include <openssl/err.h>
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| 20 | #include <openssl/engine.h>
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| 21 |
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| 22 | EC_KEY *EC_KEY_new(void)
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| 23 | {
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| 24 | return EC_KEY_new_method(NULL);
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| 25 | }
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| 26 |
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| 27 | EC_KEY *EC_KEY_new_by_curve_name(int nid)
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| 28 | {
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| 29 | EC_KEY *ret = EC_KEY_new();
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| 30 | if (ret == NULL)
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| 31 | return NULL;
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| 32 | ret->group = EC_GROUP_new_by_curve_name(nid);
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| 33 | if (ret->group == NULL) {
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| 34 | EC_KEY_free(ret);
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| 35 | return NULL;
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| 36 | }
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| 37 | if (ret->meth->set_group != NULL
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| 38 | && ret->meth->set_group(ret, ret->group) == 0) {
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| 39 | EC_KEY_free(ret);
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| 40 | return NULL;
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| 41 | }
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| 42 | return ret;
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| 43 | }
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| 44 |
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| 45 | void EC_KEY_free(EC_KEY *r)
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| 46 | {
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| 47 | int i;
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| 48 |
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| 49 | if (r == NULL)
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| 50 | return;
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| 51 |
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| 52 | CRYPTO_atomic_add(&r->references, -1, &i, r->lock);
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| 53 | REF_PRINT_COUNT("EC_KEY", r);
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| 54 | if (i > 0)
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| 55 | return;
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| 56 | REF_ASSERT_ISNT(i < 0);
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| 57 |
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| 58 | if (r->meth->finish != NULL)
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| 59 | r->meth->finish(r);
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| 60 |
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| 61 | #ifndef OPENSSL_NO_ENGINE
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| 62 | ENGINE_finish(r->engine);
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| 63 | #endif
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| 64 |
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| 65 | if (r->group && r->group->meth->keyfinish)
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| 66 | r->group->meth->keyfinish(r);
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| 67 |
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| 68 | CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, r, &r->ex_data);
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| 69 | CRYPTO_THREAD_lock_free(r->lock);
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| 70 | EC_GROUP_free(r->group);
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| 71 | EC_POINT_free(r->pub_key);
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| 72 | BN_clear_free(r->priv_key);
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| 73 |
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| 74 | OPENSSL_clear_free((void *)r, sizeof(EC_KEY));
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| 75 | }
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| 76 |
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| 77 | EC_KEY *EC_KEY_copy(EC_KEY *dest, const EC_KEY *src)
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| 78 | {
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| 79 | if (dest == NULL || src == NULL) {
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| 80 | ECerr(EC_F_EC_KEY_COPY, ERR_R_PASSED_NULL_PARAMETER);
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| 81 | return NULL;
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| 82 | }
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| 83 | if (src->meth != dest->meth) {
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| 84 | if (dest->meth->finish != NULL)
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| 85 | dest->meth->finish(dest);
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| 86 | if (dest->group && dest->group->meth->keyfinish)
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| 87 | dest->group->meth->keyfinish(dest);
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| 88 | #ifndef OPENSSL_NO_ENGINE
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| 89 | if (ENGINE_finish(dest->engine) == 0)
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| 90 | return 0;
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| 91 | dest->engine = NULL;
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| 92 | #endif
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| 93 | }
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| 94 | /* copy the parameters */
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| 95 | if (src->group != NULL) {
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| 96 | const EC_METHOD *meth = EC_GROUP_method_of(src->group);
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| 97 | /* clear the old group */
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| 98 | EC_GROUP_free(dest->group);
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| 99 | dest->group = EC_GROUP_new(meth);
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| 100 | if (dest->group == NULL)
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| 101 | return NULL;
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| 102 | if (!EC_GROUP_copy(dest->group, src->group))
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| 103 | return NULL;
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| 104 |
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| 105 | /* copy the public key */
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| 106 | if (src->pub_key != NULL) {
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| 107 | EC_POINT_free(dest->pub_key);
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| 108 | dest->pub_key = EC_POINT_new(src->group);
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| 109 | if (dest->pub_key == NULL)
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| 110 | return NULL;
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| 111 | if (!EC_POINT_copy(dest->pub_key, src->pub_key))
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| 112 | return NULL;
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| 113 | }
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| 114 | /* copy the private key */
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| 115 | if (src->priv_key != NULL) {
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| 116 | if (dest->priv_key == NULL) {
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| 117 | dest->priv_key = BN_new();
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| 118 | if (dest->priv_key == NULL)
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| 119 | return NULL;
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| 120 | }
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| 121 | if (!BN_copy(dest->priv_key, src->priv_key))
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| 122 | return NULL;
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| 123 | if (src->group->meth->keycopy
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| 124 | && src->group->meth->keycopy(dest, src) == 0)
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| 125 | return NULL;
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| 126 | }
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| 127 | }
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| 128 |
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| 129 |
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| 130 | /* copy the rest */
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| 131 | dest->enc_flag = src->enc_flag;
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| 132 | dest->conv_form = src->conv_form;
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| 133 | dest->version = src->version;
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| 134 | dest->flags = src->flags;
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| 135 | if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_EC_KEY,
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| 136 | &dest->ex_data, &src->ex_data))
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| 137 | return NULL;
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| 138 |
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| 139 | if (src->meth != dest->meth) {
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| 140 | #ifndef OPENSSL_NO_ENGINE
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| 141 | if (src->engine != NULL && ENGINE_init(src->engine) == 0)
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| 142 | return NULL;
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| 143 | dest->engine = src->engine;
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| 144 | #endif
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| 145 | dest->meth = src->meth;
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| 146 | }
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| 147 |
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| 148 | if (src->meth->copy != NULL && src->meth->copy(dest, src) == 0)
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| 149 | return NULL;
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| 150 |
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| 151 | return dest;
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| 152 | }
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| 153 |
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| 154 | EC_KEY *EC_KEY_dup(const EC_KEY *ec_key)
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| 155 | {
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| 156 | EC_KEY *ret = EC_KEY_new_method(ec_key->engine);
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| 157 |
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| 158 | if (ret == NULL)
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| 159 | return NULL;
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| 160 |
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| 161 | if (EC_KEY_copy(ret, ec_key) == NULL) {
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| 162 | EC_KEY_free(ret);
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| 163 | return NULL;
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| 164 | }
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| 165 | return ret;
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| 166 | }
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| 167 |
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| 168 | int EC_KEY_up_ref(EC_KEY *r)
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| 169 | {
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| 170 | int i;
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| 171 |
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| 172 | if (CRYPTO_atomic_add(&r->references, 1, &i, r->lock) <= 0)
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| 173 | return 0;
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| 174 |
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| 175 | REF_PRINT_COUNT("EC_KEY", r);
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| 176 | REF_ASSERT_ISNT(i < 2);
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| 177 | return ((i > 1) ? 1 : 0);
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| 178 | }
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| 179 |
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| 180 | int EC_KEY_generate_key(EC_KEY *eckey)
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| 181 | {
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| 182 | if (eckey == NULL || eckey->group == NULL) {
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| 183 | ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER);
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| 184 | return 0;
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| 185 | }
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| 186 | if (eckey->meth->keygen != NULL)
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| 187 | return eckey->meth->keygen(eckey);
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| 188 | ECerr(EC_F_EC_KEY_GENERATE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
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| 189 | return 0;
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| 190 | }
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| 191 |
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| 192 | int ossl_ec_key_gen(EC_KEY *eckey)
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| 193 | {
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| 194 | OPENSSL_assert(eckey->group->meth->keygen != NULL);
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| 195 | return eckey->group->meth->keygen(eckey);
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| 196 | }
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| 197 |
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| 198 | int ec_key_simple_generate_key(EC_KEY *eckey)
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| 199 | {
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| 200 | int ok = 0;
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| 201 | BN_CTX *ctx = NULL;
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| 202 | BIGNUM *priv_key = NULL;
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| 203 | const BIGNUM *order = NULL;
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| 204 | EC_POINT *pub_key = NULL;
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| 205 |
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| 206 | if ((ctx = BN_CTX_new()) == NULL)
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| 207 | goto err;
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| 208 |
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| 209 | if (eckey->priv_key == NULL) {
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| 210 | priv_key = BN_new();
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| 211 | if (priv_key == NULL)
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| 212 | goto err;
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| 213 | } else
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| 214 | priv_key = eckey->priv_key;
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| 215 |
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| 216 | order = EC_GROUP_get0_order(eckey->group);
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| 217 | if (order == NULL)
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| 218 | goto err;
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| 219 |
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| 220 | do
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| 221 | if (!BN_rand_range(priv_key, order))
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| 222 | goto err;
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| 223 | while (BN_is_zero(priv_key)) ;
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| 224 |
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| 225 | if (eckey->pub_key == NULL) {
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| 226 | pub_key = EC_POINT_new(eckey->group);
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| 227 | if (pub_key == NULL)
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| 228 | goto err;
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| 229 | } else
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| 230 | pub_key = eckey->pub_key;
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| 231 |
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| 232 | if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
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| 233 | goto err;
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| 234 |
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| 235 | eckey->priv_key = priv_key;
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| 236 | eckey->pub_key = pub_key;
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| 237 |
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| 238 | ok = 1;
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| 239 |
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| 240 | err:
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| 241 | if (eckey->pub_key == NULL)
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| 242 | EC_POINT_free(pub_key);
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| 243 | if (eckey->priv_key != priv_key)
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| 244 | BN_free(priv_key);
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| 245 | BN_CTX_free(ctx);
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| 246 | return ok;
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| 247 | }
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| 248 |
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| 249 | int ec_key_simple_generate_public_key(EC_KEY *eckey)
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| 250 | {
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| 251 | return EC_POINT_mul(eckey->group, eckey->pub_key, eckey->priv_key, NULL,
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| 252 | NULL, NULL);
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| 253 | }
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| 254 |
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| 255 | int EC_KEY_check_key(const EC_KEY *eckey)
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| 256 | {
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| 257 | if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) {
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| 258 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
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| 259 | return 0;
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| 260 | }
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| 261 |
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| 262 | if (eckey->group->meth->keycheck == NULL) {
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| 263 | ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
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| 264 | return 0;
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| 265 | }
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| 266 |
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| 267 | return eckey->group->meth->keycheck(eckey);
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| 268 | }
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| 269 |
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| 270 | int ec_key_simple_check_key(const EC_KEY *eckey)
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| 271 | {
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| 272 | int ok = 0;
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| 273 | BN_CTX *ctx = NULL;
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| 274 | const BIGNUM *order = NULL;
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| 275 | EC_POINT *point = NULL;
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| 276 |
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| 277 | if (eckey == NULL || eckey->group == NULL || eckey->pub_key == NULL) {
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| 278 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
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| 279 | return 0;
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| 280 | }
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| 281 |
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| 282 | if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) {
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| 283 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_AT_INFINITY);
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| 284 | goto err;
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| 285 | }
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| 286 |
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| 287 | if ((ctx = BN_CTX_new()) == NULL)
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| 288 | goto err;
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| 289 | if ((point = EC_POINT_new(eckey->group)) == NULL)
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| 290 | goto err;
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| 291 |
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| 292 | /* testing whether the pub_key is on the elliptic curve */
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| 293 | if (EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx) <= 0) {
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| 294 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
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| 295 | goto err;
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| 296 | }
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| 297 | /* testing whether pub_key * order is the point at infinity */
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| 298 | order = eckey->group->order;
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| 299 | if (BN_is_zero(order)) {
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| 300 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
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| 301 | goto err;
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| 302 | }
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| 303 | if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) {
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| 304 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB);
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| 305 | goto err;
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| 306 | }
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| 307 | if (!EC_POINT_is_at_infinity(eckey->group, point)) {
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| 308 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER);
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| 309 | goto err;
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| 310 | }
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| 311 | /*
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| 312 | * in case the priv_key is present : check if generator * priv_key ==
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| 313 | * pub_key
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| 314 | */
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| 315 | if (eckey->priv_key != NULL) {
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| 316 | if (BN_cmp(eckey->priv_key, order) >= 0) {
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| 317 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_WRONG_ORDER);
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| 318 | goto err;
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| 319 | }
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| 320 | if (!EC_POINT_mul(eckey->group, point, eckey->priv_key,
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| 321 | NULL, NULL, ctx)) {
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| 322 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, ERR_R_EC_LIB);
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| 323 | goto err;
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| 324 | }
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| 325 | if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) {
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| 326 | ECerr(EC_F_EC_KEY_SIMPLE_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
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| 327 | goto err;
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| 328 | }
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| 329 | }
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| 330 | ok = 1;
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| 331 | err:
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| 332 | BN_CTX_free(ctx);
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| 333 | EC_POINT_free(point);
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| 334 | return ok;
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| 335 | }
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| 336 |
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| 337 | int EC_KEY_set_public_key_affine_coordinates(EC_KEY *key, BIGNUM *x,
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| 338 | BIGNUM *y)
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| 339 | {
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| 340 | BN_CTX *ctx = NULL;
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| 341 | BIGNUM *tx, *ty;
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| 342 | EC_POINT *point = NULL;
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| 343 | int ok = 0;
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| 344 | #ifndef OPENSSL_NO_EC2M
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| 345 | int tmp_nid, is_char_two = 0;
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| 346 | #endif
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| 347 |
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| 348 | if (key == NULL || key->group == NULL || x == NULL || y == NULL) {
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| 349 | ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
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| 350 | ERR_R_PASSED_NULL_PARAMETER);
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| 351 | return 0;
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| 352 | }
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| 353 | ctx = BN_CTX_new();
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| 354 | if (ctx == NULL)
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| 355 | return 0;
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| 356 |
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| 357 | BN_CTX_start(ctx);
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| 358 | point = EC_POINT_new(key->group);
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| 359 |
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| 360 | if (point == NULL)
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| 361 | goto err;
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| 362 |
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| 363 | tx = BN_CTX_get(ctx);
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| 364 | ty = BN_CTX_get(ctx);
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| 365 | if (ty == NULL)
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| 366 | goto err;
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| 367 |
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| 368 | #ifndef OPENSSL_NO_EC2M
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| 369 | tmp_nid = EC_METHOD_get_field_type(EC_GROUP_method_of(key->group));
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| 370 |
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| 371 | if (tmp_nid == NID_X9_62_characteristic_two_field)
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| 372 | is_char_two = 1;
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| 373 |
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| 374 | if (is_char_two) {
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| 375 | if (!EC_POINT_set_affine_coordinates_GF2m(key->group, point,
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| 376 | x, y, ctx))
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| 377 | goto err;
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| 378 | if (!EC_POINT_get_affine_coordinates_GF2m(key->group, point,
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| 379 | tx, ty, ctx))
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| 380 | goto err;
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| 381 | } else
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| 382 | #endif
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| 383 | {
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| 384 | if (!EC_POINT_set_affine_coordinates_GFp(key->group, point,
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| 385 | x, y, ctx))
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| 386 | goto err;
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| 387 | if (!EC_POINT_get_affine_coordinates_GFp(key->group, point,
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| 388 | tx, ty, ctx))
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| 389 | goto err;
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| 390 | }
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| 391 | /*
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| 392 | * Check if retrieved coordinates match originals and are less than field
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| 393 | * order: if not values are out of range.
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| 394 | */
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| 395 | if (BN_cmp(x, tx) || BN_cmp(y, ty)
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| 396 | || (BN_cmp(x, key->group->field) >= 0)
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| 397 | || (BN_cmp(y, key->group->field) >= 0)) {
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| 398 | ECerr(EC_F_EC_KEY_SET_PUBLIC_KEY_AFFINE_COORDINATES,
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| 399 | EC_R_COORDINATES_OUT_OF_RANGE);
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| 400 | goto err;
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| 401 | }
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| 402 |
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| 403 | if (!EC_KEY_set_public_key(key, point))
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| 404 | goto err;
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| 405 |
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| 406 | if (EC_KEY_check_key(key) == 0)
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| 407 | goto err;
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| 408 |
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| 409 | ok = 1;
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| 410 |
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| 411 | err:
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| 412 | BN_CTX_end(ctx);
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| 413 | BN_CTX_free(ctx);
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| 414 | EC_POINT_free(point);
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| 415 | return ok;
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| 416 |
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| 417 | }
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| 418 |
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| 419 | const EC_GROUP *EC_KEY_get0_group(const EC_KEY *key)
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| 420 | {
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| 421 | return key->group;
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| 422 | }
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| 423 |
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| 424 | int EC_KEY_set_group(EC_KEY *key, const EC_GROUP *group)
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| 425 | {
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| 426 | if (key->meth->set_group != NULL && key->meth->set_group(key, group) == 0)
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| 427 | return 0;
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| 428 | EC_GROUP_free(key->group);
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| 429 | key->group = EC_GROUP_dup(group);
|
---|
| 430 | return (key->group == NULL) ? 0 : 1;
|
---|
| 431 | }
|
---|
| 432 |
|
---|
| 433 | const BIGNUM *EC_KEY_get0_private_key(const EC_KEY *key)
|
---|
| 434 | {
|
---|
| 435 | return key->priv_key;
|
---|
| 436 | }
|
---|
| 437 |
|
---|
| 438 | int EC_KEY_set_private_key(EC_KEY *key, const BIGNUM *priv_key)
|
---|
| 439 | {
|
---|
| 440 | if (key->group == NULL || key->group->meth == NULL)
|
---|
| 441 | return 0;
|
---|
| 442 | if (key->group->meth->set_private != NULL
|
---|
| 443 | && key->group->meth->set_private(key, priv_key) == 0)
|
---|
| 444 | return 0;
|
---|
| 445 | if (key->meth->set_private != NULL
|
---|
| 446 | && key->meth->set_private(key, priv_key) == 0)
|
---|
| 447 | return 0;
|
---|
| 448 | BN_clear_free(key->priv_key);
|
---|
| 449 | key->priv_key = BN_dup(priv_key);
|
---|
| 450 | return (key->priv_key == NULL) ? 0 : 1;
|
---|
| 451 | }
|
---|
| 452 |
|
---|
| 453 | const EC_POINT *EC_KEY_get0_public_key(const EC_KEY *key)
|
---|
| 454 | {
|
---|
| 455 | return key->pub_key;
|
---|
| 456 | }
|
---|
| 457 |
|
---|
| 458 | int EC_KEY_set_public_key(EC_KEY *key, const EC_POINT *pub_key)
|
---|
| 459 | {
|
---|
| 460 | if (key->meth->set_public != NULL
|
---|
| 461 | && key->meth->set_public(key, pub_key) == 0)
|
---|
| 462 | return 0;
|
---|
| 463 | EC_POINT_free(key->pub_key);
|
---|
| 464 | key->pub_key = EC_POINT_dup(pub_key, key->group);
|
---|
| 465 | return (key->pub_key == NULL) ? 0 : 1;
|
---|
| 466 | }
|
---|
| 467 |
|
---|
| 468 | unsigned int EC_KEY_get_enc_flags(const EC_KEY *key)
|
---|
| 469 | {
|
---|
| 470 | return key->enc_flag;
|
---|
| 471 | }
|
---|
| 472 |
|
---|
| 473 | void EC_KEY_set_enc_flags(EC_KEY *key, unsigned int flags)
|
---|
| 474 | {
|
---|
| 475 | key->enc_flag = flags;
|
---|
| 476 | }
|
---|
| 477 |
|
---|
| 478 | point_conversion_form_t EC_KEY_get_conv_form(const EC_KEY *key)
|
---|
| 479 | {
|
---|
| 480 | return key->conv_form;
|
---|
| 481 | }
|
---|
| 482 |
|
---|
| 483 | void EC_KEY_set_conv_form(EC_KEY *key, point_conversion_form_t cform)
|
---|
| 484 | {
|
---|
| 485 | key->conv_form = cform;
|
---|
| 486 | if (key->group != NULL)
|
---|
| 487 | EC_GROUP_set_point_conversion_form(key->group, cform);
|
---|
| 488 | }
|
---|
| 489 |
|
---|
| 490 | void EC_KEY_set_asn1_flag(EC_KEY *key, int flag)
|
---|
| 491 | {
|
---|
| 492 | if (key->group != NULL)
|
---|
| 493 | EC_GROUP_set_asn1_flag(key->group, flag);
|
---|
| 494 | }
|
---|
| 495 |
|
---|
| 496 | int EC_KEY_precompute_mult(EC_KEY *key, BN_CTX *ctx)
|
---|
| 497 | {
|
---|
| 498 | if (key->group == NULL)
|
---|
| 499 | return 0;
|
---|
| 500 | return EC_GROUP_precompute_mult(key->group, ctx);
|
---|
| 501 | }
|
---|
| 502 |
|
---|
| 503 | int EC_KEY_get_flags(const EC_KEY *key)
|
---|
| 504 | {
|
---|
| 505 | return key->flags;
|
---|
| 506 | }
|
---|
| 507 |
|
---|
| 508 | void EC_KEY_set_flags(EC_KEY *key, int flags)
|
---|
| 509 | {
|
---|
| 510 | key->flags |= flags;
|
---|
| 511 | }
|
---|
| 512 |
|
---|
| 513 | void EC_KEY_clear_flags(EC_KEY *key, int flags)
|
---|
| 514 | {
|
---|
| 515 | key->flags &= ~flags;
|
---|
| 516 | }
|
---|
| 517 |
|
---|
| 518 | size_t EC_KEY_key2buf(const EC_KEY *key, point_conversion_form_t form,
|
---|
| 519 | unsigned char **pbuf, BN_CTX *ctx)
|
---|
| 520 | {
|
---|
| 521 | if (key == NULL || key->pub_key == NULL || key->group == NULL)
|
---|
| 522 | return 0;
|
---|
| 523 | return EC_POINT_point2buf(key->group, key->pub_key, form, pbuf, ctx);
|
---|
| 524 | }
|
---|
| 525 |
|
---|
| 526 | int EC_KEY_oct2key(EC_KEY *key, const unsigned char *buf, size_t len,
|
---|
| 527 | BN_CTX *ctx)
|
---|
| 528 | {
|
---|
| 529 | if (key == NULL || key->group == NULL)
|
---|
| 530 | return 0;
|
---|
| 531 | if (key->pub_key == NULL)
|
---|
| 532 | key->pub_key = EC_POINT_new(key->group);
|
---|
| 533 | if (key->pub_key == NULL)
|
---|
| 534 | return 0;
|
---|
| 535 | if (EC_POINT_oct2point(key->group, key->pub_key, buf, len, ctx) == 0)
|
---|
| 536 | return 0;
|
---|
| 537 | /*
|
---|
| 538 | * Save the point conversion form.
|
---|
| 539 | * For non-custom curves the first octet of the buffer (excluding
|
---|
| 540 | * the last significant bit) contains the point conversion form.
|
---|
| 541 | * EC_POINT_oct2point() has already performed sanity checking of
|
---|
| 542 | * the buffer so we know it is valid.
|
---|
| 543 | */
|
---|
| 544 | if ((key->group->meth->flags & EC_FLAGS_CUSTOM_CURVE) == 0)
|
---|
| 545 | key->conv_form = (point_conversion_form_t)(buf[0] & ~0x01);
|
---|
| 546 | return 1;
|
---|
| 547 | }
|
---|
| 548 |
|
---|
| 549 | size_t EC_KEY_priv2oct(const EC_KEY *eckey,
|
---|
| 550 | unsigned char *buf, size_t len)
|
---|
| 551 | {
|
---|
| 552 | if (eckey->group == NULL || eckey->group->meth == NULL)
|
---|
| 553 | return 0;
|
---|
| 554 | if (eckey->group->meth->priv2oct == NULL) {
|
---|
| 555 | ECerr(EC_F_EC_KEY_PRIV2OCT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
|
---|
| 556 | return 0;
|
---|
| 557 | }
|
---|
| 558 |
|
---|
| 559 | return eckey->group->meth->priv2oct(eckey, buf, len);
|
---|
| 560 | }
|
---|
| 561 |
|
---|
| 562 | size_t ec_key_simple_priv2oct(const EC_KEY *eckey,
|
---|
| 563 | unsigned char *buf, size_t len)
|
---|
| 564 | {
|
---|
| 565 | size_t buf_len;
|
---|
| 566 |
|
---|
| 567 | buf_len = (EC_GROUP_order_bits(eckey->group) + 7) / 8;
|
---|
| 568 | if (eckey->priv_key == NULL)
|
---|
| 569 | return 0;
|
---|
| 570 | if (buf == NULL)
|
---|
| 571 | return buf_len;
|
---|
| 572 | else if (len < buf_len)
|
---|
| 573 | return 0;
|
---|
| 574 |
|
---|
| 575 | /* Octetstring may need leading zeros if BN is to short */
|
---|
| 576 |
|
---|
| 577 | if (BN_bn2binpad(eckey->priv_key, buf, buf_len) == -1) {
|
---|
| 578 | ECerr(EC_F_EC_KEY_SIMPLE_PRIV2OCT, EC_R_BUFFER_TOO_SMALL);
|
---|
| 579 | return 0;
|
---|
| 580 | }
|
---|
| 581 |
|
---|
| 582 | return buf_len;
|
---|
| 583 | }
|
---|
| 584 |
|
---|
| 585 | int EC_KEY_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len)
|
---|
| 586 | {
|
---|
| 587 | if (eckey->group == NULL || eckey->group->meth == NULL)
|
---|
| 588 | return 0;
|
---|
| 589 | if (eckey->group->meth->oct2priv == NULL) {
|
---|
| 590 | ECerr(EC_F_EC_KEY_OCT2PRIV, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
|
---|
| 591 | return 0;
|
---|
| 592 | }
|
---|
| 593 | return eckey->group->meth->oct2priv(eckey, buf, len);
|
---|
| 594 | }
|
---|
| 595 |
|
---|
| 596 | int ec_key_simple_oct2priv(EC_KEY *eckey, const unsigned char *buf, size_t len)
|
---|
| 597 | {
|
---|
| 598 | if (eckey->priv_key == NULL)
|
---|
| 599 | eckey->priv_key = BN_secure_new();
|
---|
| 600 | if (eckey->priv_key == NULL) {
|
---|
| 601 | ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_MALLOC_FAILURE);
|
---|
| 602 | return 0;
|
---|
| 603 | }
|
---|
| 604 | eckey->priv_key = BN_bin2bn(buf, len, eckey->priv_key);
|
---|
| 605 | if (eckey->priv_key == NULL) {
|
---|
| 606 | ECerr(EC_F_EC_KEY_SIMPLE_OCT2PRIV, ERR_R_BN_LIB);
|
---|
| 607 | return 0;
|
---|
| 608 | }
|
---|
| 609 | return 1;
|
---|
| 610 | }
|
---|
| 611 |
|
---|
| 612 | size_t EC_KEY_priv2buf(const EC_KEY *eckey, unsigned char **pbuf)
|
---|
| 613 | {
|
---|
| 614 | size_t len;
|
---|
| 615 | unsigned char *buf;
|
---|
| 616 | len = EC_KEY_priv2oct(eckey, NULL, 0);
|
---|
| 617 | if (len == 0)
|
---|
| 618 | return 0;
|
---|
| 619 | buf = OPENSSL_malloc(len);
|
---|
| 620 | if (buf == NULL)
|
---|
| 621 | return 0;
|
---|
| 622 | len = EC_KEY_priv2oct(eckey, buf, len);
|
---|
| 623 | if (len == 0) {
|
---|
| 624 | OPENSSL_free(buf);
|
---|
| 625 | return 0;
|
---|
| 626 | }
|
---|
| 627 | *pbuf = buf;
|
---|
| 628 | return len;
|
---|
| 629 | }
|
---|
| 630 |
|
---|
| 631 | int EC_KEY_can_sign(const EC_KEY *eckey)
|
---|
| 632 | {
|
---|
| 633 | if (eckey->group == NULL || eckey->group->meth == NULL
|
---|
| 634 | || (eckey->group->meth->flags & EC_FLAGS_NO_SIGN))
|
---|
| 635 | return 0;
|
---|
| 636 | return 1;
|
---|
| 637 | }
|
---|