crypto/ec/ec_kmeth.c

   1 /*
   2  * Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <string.h>
  11 #include <openssl/ec.h>
  12 #include <openssl/engine.h>
  13 #include <openssl/err.h>
  14 #include "ec_lcl.h"
  15
  16
  17 static const EC_KEY_METHOD openssl_ec_key_method = {
  18     "OpenSSL EC_KEY method",
  19     0,
  20     0,0,0,0,0,0,
  21     ossl_ec_key_gen,
  22     ossl_ecdh_compute_key,
  23     ossl_ecdsa_sign,
  24     ossl_ecdsa_sign_setup,
  25     ossl_ecdsa_sign_sig,
  26     ossl_ecdsa_verify,
  27     ossl_ecdsa_verify_sig
  28 };
  29
  30 static const EC_KEY_METHOD *default_ec_key_meth = &openssl_ec_key_method;
  31
  32 const EC_KEY_METHOD *EC_KEY_OpenSSL(void)
  33 {
  34     return &openssl_ec_key_method;
  35 }
  36
  37 const EC_KEY_METHOD *EC_KEY_get_default_method(void)
  38 {
  39     return default_ec_key_meth;
  40 }
  41
  42 void EC_KEY_set_default_method(const EC_KEY_METHOD *meth)
  43 {
  44     if (meth == NULL)
  45         default_ec_key_meth = &openssl_ec_key_method;
  46     else
  47         default_ec_key_meth = meth;
  48 }
  49
  50 const EC_KEY_METHOD *EC_KEY_get_method(const EC_KEY *key)
  51 {
  52     return key->meth;
  53 }
  54
  55 int EC_KEY_set_method(EC_KEY *key, const EC_KEY_METHOD *meth)
  56 {
  57     void (*finish)(EC_KEY *key) = key->meth->finish;
  58
  59     if (finish != NULL)
  60         finish(key);
  61
  62 #ifndef OPENSSL_NO_ENGINE
  63     ENGINE_finish(key->engine);
  64     key->engine = NULL;
  65 #endif
  66
  67     key->meth = meth;
  68     if (meth->init != NULL)
  69         return meth->init(key);
  70     return 1;
  71 }
  72
  73 EC_KEY *EC_KEY_new_method(ENGINE *engine)
  74 {
  75     EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
  76
  77     if (ret == NULL) {
  78         ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  79         return NULL;
  80     }
  81     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
  82         OPENSSL_free(ret);
  83         return NULL;
  84     }
  85
  86     ret->lock = CRYPTO_THREAD_lock_new();
  87     if (ret->lock == NULL) {
  88         ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  89         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data);
  90         OPENSSL_free(ret);
  91         return NULL;
  92     }
  93
  94     ret->meth = EC_KEY_get_default_method();
  95 #ifndef OPENSSL_NO_ENGINE
  96     if (engine != NULL) {
  97         if (!ENGINE_init(engine)) {
  98             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
  99             CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data);
 100             CRYPTO_THREAD_lock_free(ret->lock);
 101             OPENSSL_free(ret);
 102             return NULL;
 103         }
 104         ret->engine = engine;
 105     } else
 106         ret->engine = ENGINE_get_default_EC();
 107     if (ret->engine != NULL) {
 108         ret->meth = ENGINE_get_EC(ret->engine);
 109         if (ret->meth == NULL) {
 110             ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_ENGINE_LIB);
 111             ENGINE_finish(ret->engine);
 112             CRYPTO_free_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data);
 113             CRYPTO_THREAD_lock_free(ret->lock);
 114             OPENSSL_free(ret);
 115             return NULL;
 116         }
 117     }
 118 #endif
 119
 120     ret->version = 1;
 121     ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
 122     ret->references = 1;
 123
 124     if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
 125         ECerr(EC_F_EC_KEY_NEW_METHOD, ERR_R_INIT_FAIL);
 126         EC_KEY_free(ret);
 127         return NULL;
 128     }
 129     return ret;
 130 }
 131
 132 int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 133                      const EC_KEY *eckey,
 134                      void *(*KDF) (const void *in, size_t inlen, void *out,
 135                                    size_t *outlen))
 136 {
 137     unsigned char *sec = NULL;
 138     size_t seclen;
 139     if (eckey->meth->compute_key == NULL) {
 140         ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
 141         return 0;
 142     }
 143     if (outlen > INT_MAX) {
 144         ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_INVALID_OUTPUT_LENGTH);
 145         return 0;
 146     }
 147     if (!eckey->meth->compute_key(&sec, &seclen, pub_key, eckey))
 148         return 0;
 149     if (KDF != NULL) {
 150         KDF(sec, seclen, out, &outlen);
 151     } else {
 152         if (outlen > seclen)
 153             outlen = seclen;
 154         memcpy(out, sec, outlen);
 155     }
 156     OPENSSL_clear_free(sec, seclen);
 157     return outlen;
 158 }
 159
 160 EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
 161 {
 162     EC_KEY_METHOD *ret = OPENSSL_zalloc(sizeof(*meth));
 163
 164     if (ret == NULL)
 165         return NULL;
 166     if (meth != NULL)
 167         *ret = *meth;
 168     ret->flags |= EC_KEY_METHOD_DYNAMIC;
 169     return ret;
 170 }
 171
 172 void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
 173 {
 174     if (meth->flags & EC_KEY_METHOD_DYNAMIC)
 175         OPENSSL_free(meth);
 176 }
 177
 178 void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
 179                             int (*init)(EC_KEY *key),
 180                             void (*finish)(EC_KEY *key),
 181                             int (*copy)(EC_KEY *dest, const EC_KEY *src),
 182                             int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
 183                             int (*set_private)(EC_KEY *key,
 184                                                const BIGNUM *priv_key),
 185                             int (*set_public)(EC_KEY *key,
 186                                               const EC_POINT *pub_key))
 187 {
 188     meth->init = init;
 189     meth->finish = finish;
 190     meth->copy = copy;
 191     meth->set_group = set_group;
 192     meth->set_private = set_private;
 193     meth->set_public = set_public;
 194 }
 195
 196 void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
 197                               int (*keygen)(EC_KEY *key))
 198 {
 199     meth->keygen = keygen;
 200 }
 201
 202 void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
 203                                    int (*ckey)(unsigned char **psec,
 204                                                size_t *pseclen,
 205                                                const EC_POINT *pub_key,
 206                                                const EC_KEY *ecdh))
 207 {
 208     meth->compute_key = ckey;
 209 }
 210
 211 void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
 212                             int (*sign)(int type, const unsigned char *dgst,
 213                                         int dlen, unsigned char *sig,
 214                                         unsigned int *siglen,
 215                                         const BIGNUM *kinv, const BIGNUM *r,
 216                                         EC_KEY *eckey),
 217                             int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
 218                                               BIGNUM **kinvp, BIGNUM **rp),
 219                             ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
 220                                                    int dgst_len,
 221                                                    const BIGNUM *in_kinv,
 222                                                    const BIGNUM *in_r,
 223                                                    EC_KEY *eckey))
 224 {
 225     meth->sign = sign;
 226     meth->sign_setup = sign_setup;
 227     meth->sign_sig = sign_sig;
 228 }
 229
 230 void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
 231                               int (*verify)(int type, const unsigned
 232                                             char *dgst, int dgst_len,
 233                                             const unsigned char *sigbuf,
 234                                             int sig_len, EC_KEY *eckey),
 235                               int (*verify_sig)(const unsigned char *dgst,
 236                                                 int dgst_len,
 237                                                 const ECDSA_SIG *sig,
 238                                                 EC_KEY *eckey))
 239 {
 240     meth->verify = verify;
 241     meth->verify_sig = verify_sig;
 242 }
 243
 244 void EC_KEY_METHOD_get_init(EC_KEY_METHOD *meth,
 245                             int (**pinit)(EC_KEY *key),
 246                             void (**pfinish)(EC_KEY *key),
 247                             int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
 248                             int (**pset_group)(EC_KEY *key,
 249                                                const EC_GROUP *grp),
 250                             int (**pset_private)(EC_KEY *key,
 251                                                  const BIGNUM *priv_key),
 252                             int (**pset_public)(EC_KEY *key,
 253                                                 const EC_POINT *pub_key))
 254 {
 255     if (pinit != NULL)
 256         *pinit = meth->init;
 257     if (pfinish != NULL)
 258         *pfinish = meth->finish;
 259     if (pcopy != NULL)
 260         *pcopy = meth->copy;
 261     if (pset_group != NULL)
 262         *pset_group = meth->set_group;
 263     if (pset_private != NULL)
 264         *pset_private = meth->set_private;
 265     if (pset_public != NULL)
 266         *pset_public = meth->set_public;
 267 }
 268
 269 void EC_KEY_METHOD_get_keygen(EC_KEY_METHOD *meth,
 270                               int (**pkeygen)(EC_KEY *key))
 271 {
 272     if (pkeygen != NULL)
 273         *pkeygen = meth->keygen;
 274 }
 275
 276 void EC_KEY_METHOD_get_compute_key(EC_KEY_METHOD *meth,
 277                                    int (**pck)(unsigned char **pout,
 278                                                size_t *poutlen,
 279                                                const EC_POINT *pub_key,
 280                                                const EC_KEY *ecdh))
 281 {
 282     if (pck != NULL)
 283         *pck = meth->compute_key;
 284 }
 285
 286 void EC_KEY_METHOD_get_sign(EC_KEY_METHOD *meth,
 287                             int (**psign)(int type, const unsigned char *dgst,
 288                                           int dlen, unsigned char *sig,
 289                                           unsigned int *siglen,
 290                                           const BIGNUM *kinv, const BIGNUM *r,
 291                                           EC_KEY *eckey),
 292                             int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
 293                                                 BIGNUM **kinvp, BIGNUM **rp),
 294                             ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
 295                                                      int dgst_len,
 296                                                      const BIGNUM *in_kinv,
 297                                                      const BIGNUM *in_r,
 298                                                      EC_KEY *eckey))
 299 {
 300     if (psign != NULL)
 301         *psign = meth->sign;
 302     if (psign_setup != NULL)
 303         *psign_setup = meth->sign_setup;
 304     if (psign_sig != NULL)
 305         *psign_sig = meth->sign_sig;
 306 }
 307
 308 void EC_KEY_METHOD_get_verify(EC_KEY_METHOD *meth,
 309                               int (**pverify)(int type, const unsigned
 310                                               char *dgst, int dgst_len,
 311                                               const unsigned char *sigbuf,
 312                                               int sig_len, EC_KEY *eckey),
 313                               int (**pverify_sig)(const unsigned char *dgst,
 314                                                   int dgst_len,
 315                                                   const ECDSA_SIG *sig,
 316                                                   EC_KEY *eckey))
 317 {
 318     if (pverify != NULL)
 319         *pverify = meth->verify;
 320     if (pverify_sig != NULL)
 321         *pverify_sig = meth->verify_sig;
 322 }