[331] | 1 | /*
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| 2 | * Copyright 2015-2016 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 | #include <string.h>
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| 11 | #include <openssl/ec.h>
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| 12 | #include <openssl/engine.h>
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| 13 | #include <openssl/err.h>
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| 14 | #include "ec_lcl.h"
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| 15 |
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| 16 |
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| 17 | static const EC_KEY_METHOD openssl_ec_key_method = {
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| 18 | "OpenSSL EC_KEY method",
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| 19 | 0,
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| 20 | 0,0,0,0,0,0,
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| 21 | ossl_ec_key_gen,
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| 22 | ossl_ecdh_compute_key,
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| 23 | ossl_ecdsa_sign,
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| 24 | ossl_ecdsa_sign_setup,
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| 25 | ossl_ecdsa_sign_sig,
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| 26 | ossl_ecdsa_verify,
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| 27 | ossl_ecdsa_verify_sig
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| 28 | };
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| 29 |
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| 30 | static const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;
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| 31 |
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| 32 | const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
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| 33 | {
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| 34 | return &openssl_ec_key_method;
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| 35 | }
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| 36 |
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| 37 | const EC_KEY_METHOD *EC_KEY_get_default_method(void)
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| 38 | {
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| 39 | return default_ec_key_meth;
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| 40 | }
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| 41 |
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| 42 | void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
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| 43 | {
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| 44 | if (meth == NULL)
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| 45 | default_ec_key_meth = &openssl_ec_key_method;
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| 46 | else
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| 47 | default_ec_key_meth = meth;
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| 48 | }
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| 49 |
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| 50 | const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key)
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| 51 | {
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| 52 | return key->meth;
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| 53 | }
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| 54 |
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| 55 | int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth)
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| 56 | {
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| 57 | void (*finish)(EC_KEY *key) = key->meth->finish;
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| 58 |
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| 59 | if (finish != NULL)
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| 60 | finish(key);
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| 61 |
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| 62 | #ifndef OPENSSL_NO_ENGINE
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| 63 | ENGINE_finish(key->engine);
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| 64 | key->engine = NULL;
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| 65 | #endif
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| 66 |
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| 67 | key->meth = meth;
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| 68 | if (meth->init != NULL)
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| 69 | return meth->init(key);
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| 70 | return 1;
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| 71 | }
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| 72 |
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| 73 | EC_KEY *EC_KEY_new_method(ENGINE *engine)
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| 74 | {
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| 75 | EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
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| 76 |
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| 77 | if (ret == NULL) {
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| 78 | ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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| 79 | return NULL;
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| 80 | }
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| 81 |
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| 82 | ret->references = 1;
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| 83 | ret->lock = CRYPTO_THREAD_lock_new();
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| 84 | if (ret->lock == NULL) {
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| 85 | ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
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| 86 | OPENSSL_free(ret);
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| 87 | return NULL;
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| 88 | }
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| 89 |
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| 90 | ret->meth = EC_KEY_get_default_method();
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| 91 | #ifndef OPENSSL_NO_ENGINE
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| 92 | if (engine != NULL) {
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| 93 | if (!ENGINE_init(engine)) {
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| 94 | ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
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| 95 | goto err;
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| 96 | }
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| 97 | ret->engine = engine;
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| 98 | } else
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| 99 | ret->engine = ENGINE_get_default_EC();
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| 100 | if (ret->engine != NULL) {
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| 101 | ret->meth = ENGINE_get_EC(ret->engine);
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| 102 | if (ret->meth == NULL) {
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| 103 | ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
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| 104 | goto err;
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| 105 | }
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| 106 | }
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| 107 | #endif
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| 108 |
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| 109 | ret->version = 1;
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| 110 | ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
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| 111 |
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| 112 | if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
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| 113 | goto err;
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| 114 | }
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| 115 |
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| 116 | if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
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| 117 | ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_INIT_FAIL);
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| 118 | goto err;
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| 119 | }
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| 120 | return ret;
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| 121 |
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| 122 | err:
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| 123 | EC_KEY_free(ret);
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| 124 | return NULL;
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| 125 | }
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| 126 |
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| 127 | int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
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| 128 | const EC_KEY *eckey,
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| 129 | void *(*KDF) (const void *in, size_t inlen, void *out,
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| 130 | size_t *outlen))
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| 131 | {
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| 132 | unsigned char *sec = NULL;
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| 133 | size_t seclen;
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| 134 | if (eckey->meth->compute_key == NULL) {
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| 135 | ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
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| 136 | return 0;
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| 137 | }
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| 138 | if (outlen > INT_MAX) {
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| 139 | ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_INVALID_OUTPUT_LENGTH);
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| 140 | return 0;
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| 141 | }
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| 142 | if (!eckey->meth->compute_key(&sec, &seclen, pub_key, eckey))
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| 143 | return 0;
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| 144 | if (KDF != NULL) {
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| 145 | KDF(sec, seclen, out, &outlen);
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| 146 | } else {
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| 147 | if (outlen > seclen)
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| 148 | outlen = seclen;
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| 149 | memcpy(out, sec, outlen);
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| 150 | }
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| 151 | OPENSSL_clear_free(sec, seclen);
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| 152 | return outlen;
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| 153 | }
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| 154 |
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| 155 | EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
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| 156 | {
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| 157 | EC_KEY_METHOD *ret = OPENSSL_zalloc(sizeof(*meth));
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| 158 |
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| 159 | if (ret == NULL)
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| 160 | return NULL;
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| 161 | if (meth != NULL)
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| 162 | *ret = *meth;
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| 163 | ret->flags |= EC_KEY_METHOD_DYNAMIC;
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| 164 | return ret;
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| 165 | }
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| 166 |
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| 167 | void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
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| 168 | {
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| 169 | if (meth->flags & EC_KEY_METHOD_DYNAMIC)
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| 170 | OPENSSL_free(meth);
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| 171 | }
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| 172 |
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| 173 | void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
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| 174 | int (*init)(EC_KEY *key),
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| 175 | void (*finish)(EC_KEY *key),
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| 176 | int (*copy)(EC_KEY *dest, const EC_KEY *src),
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| 177 | int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
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| 178 | int (*set_private)(EC_KEY *key,
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| 179 | const BIGNUM *priv_key),
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| 180 | int (*set_public)(EC_KEY *key,
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| 181 | const EC_POINT *pub_key))
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| 182 | {
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| 183 | meth->init = init;
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| 184 | meth->finish = finish;
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| 185 | meth->copy = copy;
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| 186 | meth->set_group = set_group;
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| 187 | meth->set_private = set_private;
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| 188 | meth->set_public = set_public;
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| 189 | }
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| 190 |
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| 191 | void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
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| 192 | int (*keygen)(EC_KEY *key))
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| 193 | {
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| 194 | meth->keygen = keygen;
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| 195 | }
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| 196 |
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| 197 | void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
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| 198 | int (*ckey)(unsigned char **psec,
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| 199 | size_t *pseclen,
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| 200 | const EC_POINT *pub_key,
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| 201 | const EC_KEY *ecdh))
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| 202 | {
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| 203 | meth->compute_key = ckey;
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| 204 | }
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| 205 |
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| 206 | void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
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| 207 | int (*sign)(int type, const unsigned char *dgst,
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| 208 | int dlen, unsigned char *sig,
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| 209 | unsigned int *siglen,
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| 210 | const BIGNUM *kinv, const BIGNUM *r,
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| 211 | EC_KEY *eckey),
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| 212 | int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
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| 213 | BIGNUM **kinvp, BIGNUM **rp),
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| 214 | ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
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| 215 | int dgst_len,
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| 216 | const BIGNUM *in_kinv,
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| 217 | const BIGNUM *in_r,
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| 218 | EC_KEY *eckey))
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| 219 | {
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| 220 | meth->sign = sign;
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| 221 | meth->sign_setup = sign_setup;
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| 222 | meth->sign_sig = sign_sig;
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| 223 | }
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| 224 |
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| 225 | void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
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| 226 | int (*verify)(int type, const unsigned
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| 227 | char *dgst, int dgst_len,
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| 228 | const unsigned char *sigbuf,
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| 229 | int sig_len, EC_KEY *eckey),
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| 230 | int (*verify_sig)(const unsigned char *dgst,
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| 231 | int dgst_len,
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| 232 | const ECDSA_SIG *sig,
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| 233 | EC_KEY *eckey))
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| 234 | {
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| 235 | meth->verify = verify;
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| 236 | meth->verify_sig = verify_sig;
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| 237 | }
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| 238 |
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| 239 | void EC_KEY_METHOD_get_init(EC_KEY_METHOD *meth,
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| 240 | int (**pinit)(EC_KEY *key),
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| 241 | void (**pfinish)(EC_KEY *key),
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| 242 | int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
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| 243 | int (**pset_group)(EC_KEY *key,
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| 244 | const EC_GROUP *grp),
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| 245 | int (**pset_private)(EC_KEY *key,
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| 246 | const BIGNUM *priv_key),
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| 247 | int (**pset_public)(EC_KEY *key,
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| 248 | const EC_POINT *pub_key))
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| 249 | {
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| 250 | if (pinit != NULL)
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| 251 | *pinit = meth->init;
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| 252 | if (pfinish != NULL)
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| 253 | *pfinish = meth->finish;
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| 254 | if (pcopy != NULL)
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| 255 | *pcopy = meth->copy;
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| 256 | if (pset_group != NULL)
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| 257 | *pset_group = meth->set_group;
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| 258 | if (pset_private != NULL)
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| 259 | *pset_private = meth->set_private;
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| 260 | if (pset_public != NULL)
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| 261 | *pset_public = meth->set_public;
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| 262 | }
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| 263 |
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| 264 | void EC_KEY_METHOD_get_keygen(EC_KEY_METHOD *meth,
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| 265 | int (**pkeygen)(EC_KEY *key))
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| 266 | {
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| 267 | if (pkeygen != NULL)
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| 268 | *pkeygen = meth->keygen;
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| 269 | }
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| 270 |
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| 271 | void EC_KEY_METHOD_get_compute_key(EC_KEY_METHOD *meth,
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| 272 | int (**pck)(unsigned char **pout,
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| 273 | size_t *poutlen,
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| 274 | const EC_POINT *pub_key,
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| 275 | const EC_KEY *ecdh))
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| 276 | {
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| 277 | if (pck != NULL)
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| 278 | *pck = meth->compute_key;
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| 279 | }
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| 280 |
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| 281 | void EC_KEY_METHOD_get_sign(EC_KEY_METHOD *meth,
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| 282 | int (**psign)(int type, const unsigned char *dgst,
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| 283 | int dlen, unsigned char *sig,
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| 284 | unsigned int *siglen,
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| 285 | const BIGNUM *kinv, const BIGNUM *r,
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| 286 | EC_KEY *eckey),
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| 287 | int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
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| 288 | BIGNUM **kinvp, BIGNUM **rp),
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| 289 | ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
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| 290 | int dgst_len,
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| 291 | const BIGNUM *in_kinv,
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| 292 | const BIGNUM *in_r,
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| 293 | EC_KEY *eckey))
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| 294 | {
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| 295 | if (psign != NULL)
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| 296 | *psign = meth->sign;
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| 297 | if (psign_setup != NULL)
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| 298 | *psign_setup = meth->sign_setup;
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| 299 | if (psign_sig != NULL)
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| 300 | *psign_sig = meth->sign_sig;
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| 301 | }
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| 302 |
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| 303 | void EC_KEY_METHOD_get_verify(EC_KEY_METHOD *meth,
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| 304 | int (**pverify)(int type, const unsigned
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| 305 | char *dgst, int dgst_len,
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| 306 | const unsigned char *sigbuf,
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| 307 | int sig_len, EC_KEY *eckey),
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| 308 | int (**pverify_sig)(const unsigned char *dgst,
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| 309 | int dgst_len,
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| 310 | const ECDSA_SIG *sig,
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| 311 | EC_KEY *eckey))
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| 312 | {
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| 313 | if (pverify != NULL)
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| 314 | *pverify = meth->verify;
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| 315 | if (pverify_sig != NULL)
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| 316 | *pverify_sig = meth->verify_sig;
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| 317 | }
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