crypto/ec/ec_kmeth.c

   1 /*
   2  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
  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_int(OPENSSL_CTX *libctx, ENGINE *engine)
  74 {
  75     EC_KEY *ret = OPENSSL_zalloc(sizeof(*ret));
  76
  77     if (ret == NULL) {
  78         ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_MALLOC_FAILURE);
  79         return NULL;
  80     }
  81
  82     ret->libctx = libctx;
  83
  84     ret->references = 1;
  85     ret->lock = CRYPTO_THREAD_lock_new();
  86     if (ret->lock == NULL) {
  87         ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_MALLOC_FAILURE);
  88         OPENSSL_free(ret);
  89         return NULL;
  90     }
  91
  92     ret->meth = EC_KEY_get_default_method();
  93 #if !defined(OPENSSL_NO_ENGINE) && !defined(FIPS_MODE)
  94     if (engine != NULL) {
  95         if (!ENGINE_init(engine)) {
  96             ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_ENGINE_LIB);
  97             goto err;
  98         }
  99         ret->engine = engine;
 100     } else
 101         ret->engine = ENGINE_get_default_EC();
 102     if (ret->engine != NULL) {
 103         ret->meth = ENGINE_get_EC(ret->engine);
 104         if (ret->meth == NULL) {
 105             ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_ENGINE_LIB);
 106             goto err;
 107         }
 108     }
 109 #endif
 110
 111     ret->version = 1;
 112     ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
 113
 114 /* No ex_data inside the FIPS provider */
 115 #ifndef FIPS_MODE
 116     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_EC_KEY, ret, &ret->ex_data)) {
 117         goto err;
 118     }
 119 #endif
 120
 121     if (ret->meth->init != NULL && ret->meth->init(ret) == 0) {
 122         ECerr(EC_F_EC_KEY_NEW_METHOD_INT, ERR_R_INIT_FAIL);
 123         goto err;
 124     }
 125     return ret;
 126
 127  err:
 128     EC_KEY_free(ret);
 129     return NULL;
 130 }
 131
 132 #ifndef FIPS_MODE
 133 EC_KEY *EC_KEY_new_method(ENGINE *engine)
 134 {
 135     return ec_key_new_method_int(NULL, engine);
 136 }
 137 #endif
 138
 139 int ECDH_compute_key(void *out, size_t outlen, const EC_POINT *pub_key,
 140                      const EC_KEY *eckey,
 141                      void *(*KDF) (const void *in, size_t inlen, void *out,
 142                                    size_t *outlen))
 143 {
 144     unsigned char *sec = NULL;
 145     size_t seclen;
 146     if (eckey->meth->compute_key == NULL) {
 147         ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_OPERATION_NOT_SUPPORTED);
 148         return 0;
 149     }
 150     if (outlen > INT_MAX) {
 151         ECerr(EC_F_ECDH_COMPUTE_KEY, EC_R_INVALID_OUTPUT_LENGTH);
 152         return 0;
 153     }
 154     if (!eckey->meth->compute_key(&sec, &seclen, pub_key, eckey))
 155         return 0;
 156     if (KDF != NULL) {
 157         KDF(sec, seclen, out, &outlen);
 158     } else {
 159         if (outlen > seclen)
 160             outlen = seclen;
 161         memcpy(out, sec, outlen);
 162     }
 163     OPENSSL_clear_free(sec, seclen);
 164     return outlen;
 165 }
 166
 167 EC_KEY_METHOD *EC_KEY_METHOD_new(const EC_KEY_METHOD *meth)
 168 {
 169     EC_KEY_METHOD *ret = OPENSSL_zalloc(sizeof(*meth));
 170
 171     if (ret == NULL)
 172         return NULL;
 173     if (meth != NULL)
 174         *ret = *meth;
 175     ret->flags |= EC_KEY_METHOD_DYNAMIC;
 176     return ret;
 177 }
 178
 179 void EC_KEY_METHOD_free(EC_KEY_METHOD *meth)
 180 {
 181     if (meth->flags & EC_KEY_METHOD_DYNAMIC)
 182         OPENSSL_free(meth);
 183 }
 184
 185 void EC_KEY_METHOD_set_init(EC_KEY_METHOD *meth,
 186                             int (*init)(EC_KEY *key),
 187                             void (*finish)(EC_KEY *key),
 188                             int (*copy)(EC_KEY *dest, const EC_KEY *src),
 189                             int (*set_group)(EC_KEY *key, const EC_GROUP *grp),
 190                             int (*set_private)(EC_KEY *key,
 191                                                const BIGNUM *priv_key),
 192                             int (*set_public)(EC_KEY *key,
 193                                               const EC_POINT *pub_key))
 194 {
 195     meth->init = init;
 196     meth->finish = finish;
 197     meth->copy = copy;
 198     meth->set_group = set_group;
 199     meth->set_private = set_private;
 200     meth->set_public = set_public;
 201 }
 202
 203 void EC_KEY_METHOD_set_keygen(EC_KEY_METHOD *meth,
 204                               int (*keygen)(EC_KEY *key))
 205 {
 206     meth->keygen = keygen;
 207 }
 208
 209 void EC_KEY_METHOD_set_compute_key(EC_KEY_METHOD *meth,
 210                                    int (*ckey)(unsigned char **psec,
 211                                                size_t *pseclen,
 212                                                const EC_POINT *pub_key,
 213                                                const EC_KEY *ecdh))
 214 {
 215     meth->compute_key = ckey;
 216 }
 217
 218 void EC_KEY_METHOD_set_sign(EC_KEY_METHOD *meth,
 219                             int (*sign)(int type, const unsigned char *dgst,
 220                                         int dlen, unsigned char *sig,
 221                                         unsigned int *siglen,
 222                                         const BIGNUM *kinv, const BIGNUM *r,
 223                                         EC_KEY *eckey),
 224                             int (*sign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
 225                                               BIGNUM **kinvp, BIGNUM **rp),
 226                             ECDSA_SIG *(*sign_sig)(const unsigned char *dgst,
 227                                                    int dgst_len,
 228                                                    const BIGNUM *in_kinv,
 229                                                    const BIGNUM *in_r,
 230                                                    EC_KEY *eckey))
 231 {
 232     meth->sign = sign;
 233     meth->sign_setup = sign_setup;
 234     meth->sign_sig = sign_sig;
 235 }
 236
 237 void EC_KEY_METHOD_set_verify(EC_KEY_METHOD *meth,
 238                               int (*verify)(int type, const unsigned
 239                                             char *dgst, int dgst_len,
 240                                             const unsigned char *sigbuf,
 241                                             int sig_len, EC_KEY *eckey),
 242                               int (*verify_sig)(const unsigned char *dgst,
 243                                                 int dgst_len,
 244                                                 const ECDSA_SIG *sig,
 245                                                 EC_KEY *eckey))
 246 {
 247     meth->verify = verify;
 248     meth->verify_sig = verify_sig;
 249 }
 250
 251 void EC_KEY_METHOD_get_init(const EC_KEY_METHOD *meth,
 252                             int (**pinit)(EC_KEY *key),
 253                             void (**pfinish)(EC_KEY *key),
 254                             int (**pcopy)(EC_KEY *dest, const EC_KEY *src),
 255                             int (**pset_group)(EC_KEY *key,
 256                                                const EC_GROUP *grp),
 257                             int (**pset_private)(EC_KEY *key,
 258                                                  const BIGNUM *priv_key),
 259                             int (**pset_public)(EC_KEY *key,
 260                                                 const EC_POINT *pub_key))
 261 {
 262     if (pinit != NULL)
 263         *pinit = meth->init;
 264     if (pfinish != NULL)
 265         *pfinish = meth->finish;
 266     if (pcopy != NULL)
 267         *pcopy = meth->copy;
 268     if (pset_group != NULL)
 269         *pset_group = meth->set_group;
 270     if (pset_private != NULL)
 271         *pset_private = meth->set_private;
 272     if (pset_public != NULL)
 273         *pset_public = meth->set_public;
 274 }
 275
 276 void EC_KEY_METHOD_get_keygen(const EC_KEY_METHOD *meth,
 277                               int (**pkeygen)(EC_KEY *key))
 278 {
 279     if (pkeygen != NULL)
 280         *pkeygen = meth->keygen;
 281 }
 282
 283 void EC_KEY_METHOD_get_compute_key(const EC_KEY_METHOD *meth,
 284                                    int (**pck)(unsigned char **pout,
 285                                                size_t *poutlen,
 286                                                const EC_POINT *pub_key,
 287                                                const EC_KEY *ecdh))
 288 {
 289     if (pck != NULL)
 290         *pck = meth->compute_key;
 291 }
 292
 293 void EC_KEY_METHOD_get_sign(const EC_KEY_METHOD *meth,
 294                             int (**psign)(int type, const unsigned char *dgst,
 295                                           int dlen, unsigned char *sig,
 296                                           unsigned int *siglen,
 297                                           const BIGNUM *kinv, const BIGNUM *r,
 298                                           EC_KEY *eckey),
 299                             int (**psign_setup)(EC_KEY *eckey, BN_CTX *ctx_in,
 300                                                 BIGNUM **kinvp, BIGNUM **rp),
 301                             ECDSA_SIG *(**psign_sig)(const unsigned char *dgst,
 302                                                      int dgst_len,
 303                                                      const BIGNUM *in_kinv,
 304                                                      const BIGNUM *in_r,
 305                                                      EC_KEY *eckey))
 306 {
 307     if (psign != NULL)
 308         *psign = meth->sign;
 309     if (psign_setup != NULL)
 310         *psign_setup = meth->sign_setup;
 311     if (psign_sig != NULL)
 312         *psign_sig = meth->sign_sig;
 313 }
 314
 315 void EC_KEY_METHOD_get_verify(const EC_KEY_METHOD *meth,
 316                               int (**pverify)(int type, const unsigned
 317                                               char *dgst, int dgst_len,
 318                                               const unsigned char *sigbuf,
 319                                               int sig_len, EC_KEY *eckey),
 320                               int (**pverify_sig)(const unsigned char *dgst,
 321                                                   int dgst_len,
 322                                                   const ECDSA_SIG *sig,
 323                                                   EC_KEY *eckey))
 324 {
 325     if (pverify != NULL)
 326         *pverify = meth->verify;
 327     if (pverify_sig != NULL)
 328         *pverify_sig = meth->verify_sig;
 329 }