crypto/dh/dh_lib.c

   1 /*
   2  * Copyright 1995-2021 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 /*
  11  * DH low level APIs are deprecated for public use, but still ok for
  12  * internal use.
  13  */
  14 #include "internal/deprecated.h"
  15
  16 #include <stdio.h>
  17 #include <openssl/bn.h>
  18 #ifndef FIPS_MODULE
  19 # include <openssl/engine.h>
  20 #endif
  21 #include <openssl/obj_mac.h>
  22 #include <openssl/core_names.h>
  23 #include "internal/cryptlib.h"
  24 #include "internal/refcount.h"
  25 #include "crypto/evp.h"
  26 #include "crypto/dh.h"
  27 #include "dh_local.h"
  28
  29 static DH *dh_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx);
  30
  31 #ifndef FIPS_MODULE
  32 int DH_set_method(DH *dh, const DH_METHOD *meth)
  33 {
  34     /*
  35      * NB: The caller is specifically setting a method, so it's not up to us
  36      * to deal with which ENGINE it comes from.
  37      */
  38     const DH_METHOD *mtmp;
  39     mtmp = dh->meth;
  40     if (mtmp->finish)
  41         mtmp->finish(dh);
  42 #ifndef OPENSSL_NO_ENGINE
  43     ENGINE_finish(dh->engine);
  44     dh->engine = NULL;
  45 #endif
  46     dh->meth = meth;
  47     if (meth->init)
  48         meth->init(dh);
  49     return 1;
  50 }
  51
  52 const DH_METHOD *ossl_dh_get_method(const DH *dh)
  53 {
  54     return dh->meth;
  55 }
  56 # ifndef OPENSSL_NO_DEPRECATED_3_0
  57 DH *DH_new(void)
  58 {
  59     return dh_new_intern(NULL, NULL);
  60 }
  61 # endif
  62
  63 DH *DH_new_method(ENGINE *engine)
  64 {
  65     return dh_new_intern(engine, NULL);
  66 }
  67 #endif /* !FIPS_MODULE */
  68
  69 DH *ossl_dh_new_ex(OSSL_LIB_CTX *libctx)
  70 {
  71     return dh_new_intern(NULL, libctx);
  72 }
  73
  74 static DH *dh_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx)
  75 {
  76     DH *ret = OPENSSL_zalloc(sizeof(*ret));
  77
  78     if (ret == NULL) {
  79         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
  80         return NULL;
  81     }
  82
  83     ret->references = 1;
  84     ret->lock = CRYPTO_THREAD_lock_new();
  85     if (ret->lock == NULL) {
  86         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
  87         OPENSSL_free(ret);
  88         return NULL;
  89     }
  90
  91     ret->libctx = libctx;
  92     ret->meth = DH_get_default_method();
  93 #if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
  94     ret->flags = ret->meth->flags;  /* early default init */
  95     if (engine) {
  96         if (!ENGINE_init(engine)) {
  97             ERR_raise(ERR_LIB_DH, ERR_R_ENGINE_LIB);
  98             goto err;
  99         }
 100         ret->engine = engine;
 101     } else
 102         ret->engine = ENGINE_get_default_DH();
 103     if (ret->engine) {
 104         ret->meth = ENGINE_get_DH(ret->engine);
 105         if (ret->meth == NULL) {
 106             ERR_raise(ERR_LIB_DH, ERR_R_ENGINE_LIB);
 107             goto err;
 108         }
 109     }
 110 #endif
 111
 112     ret->flags = ret->meth->flags;
 113
 114 #ifndef FIPS_MODULE
 115     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data))
 116         goto err;
 117 #endif /* FIPS_MODULE */
 118
 119     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 120         ERR_raise(ERR_LIB_DH, ERR_R_INIT_FAIL);
 121         goto err;
 122     }
 123
 124     return ret;
 125
 126  err:
 127     DH_free(ret);
 128     return NULL;
 129 }
 130
 131 void DH_free(DH *r)
 132 {
 133     int i;
 134
 135     if (r == NULL)
 136         return;
 137
 138     CRYPTO_DOWN_REF(&r->references, &i, r->lock);
 139     REF_PRINT_COUNT("DH", r);
 140     if (i > 0)
 141         return;
 142     REF_ASSERT_ISNT(i < 0);
 143
 144     if (r->meth != NULL && r->meth->finish != NULL)
 145         r->meth->finish(r);
 146 #if !defined(FIPS_MODULE)
 147 # if !defined(OPENSSL_NO_ENGINE)
 148     ENGINE_finish(r->engine);
 149 # endif
 150     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
 151 #endif
 152
 153     CRYPTO_THREAD_lock_free(r->lock);
 154
 155     ossl_ffc_params_cleanup(&r->params);
 156     BN_clear_free(r->pub_key);
 157     BN_clear_free(r->priv_key);
 158     OPENSSL_free(r);
 159 }
 160
 161 int DH_up_ref(DH *r)
 162 {
 163     int i;
 164
 165     if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
 166         return 0;
 167
 168     REF_PRINT_COUNT("DH", r);
 169     REF_ASSERT_ISNT(i < 2);
 170     return ((i > 1) ? 1 : 0);
 171 }
 172
 173 void ossl_dh_set0_libctx(DH *d, OSSL_LIB_CTX *libctx)
 174 {
 175     d->libctx = libctx;
 176 }
 177
 178 #ifndef FIPS_MODULE
 179 int DH_set_ex_data(DH *d, int idx, void *arg)
 180 {
 181     return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
 182 }
 183
 184 void *DH_get_ex_data(const DH *d, int idx)
 185 {
 186     return CRYPTO_get_ex_data(&d->ex_data, idx);
 187 }
 188 #endif
 189
 190 int DH_bits(const DH *dh)
 191 {
 192     if (dh->params.p != NULL)
 193         return BN_num_bits(dh->params.p);
 194     return -1;
 195 }
 196
 197 int DH_size(const DH *dh)
 198 {
 199     if (dh->params.p != NULL)
 200         return BN_num_bytes(dh->params.p);
 201     return -1;
 202 }
 203
 204 int DH_security_bits(const DH *dh)
 205 {
 206     int N;
 207
 208     if (dh->params.q != NULL)
 209         N = BN_num_bits(dh->params.q);
 210     else if (dh->length)
 211         N = dh->length;
 212     else
 213         N = -1;
 214     if (dh->params.p != NULL)
 215         return BN_security_bits(BN_num_bits(dh->params.p), N);
 216     return -1;
 217 }
 218
 219 void DH_get0_pqg(const DH *dh,
 220                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
 221 {
 222     ossl_ffc_params_get0_pqg(&dh->params, p, q, g);
 223 }
 224
 225 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
 226 {
 227     /*
 228      * If the fields p and g in dh are NULL, the corresponding input
 229      * parameters MUST be non-NULL.  q may remain NULL.
 230      */
 231     if ((dh->params.p == NULL && p == NULL)
 232         || (dh->params.g == NULL && g == NULL))
 233         return 0;
 234
 235     ossl_ffc_params_set0_pqg(&dh->params, p, q, g);
 236     ossl_dh_cache_named_group(dh);
 237     dh->dirty_cnt++;
 238     return 1;
 239 }
 240
 241 long DH_get_length(const DH *dh)
 242 {
 243     return dh->length;
 244 }
 245
 246 int DH_set_length(DH *dh, long length)
 247 {
 248     dh->length = length;
 249     dh->dirty_cnt++;
 250     return 1;
 251 }
 252
 253 void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
 254 {
 255     if (pub_key != NULL)
 256         *pub_key = dh->pub_key;
 257     if (priv_key != NULL)
 258         *priv_key = dh->priv_key;
 259 }
 260
 261 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
 262 {
 263     if (pub_key != NULL) {
 264         BN_clear_free(dh->pub_key);
 265         dh->pub_key = pub_key;
 266     }
 267     if (priv_key != NULL) {
 268         BN_clear_free(dh->priv_key);
 269         dh->priv_key = priv_key;
 270     }
 271
 272     dh->dirty_cnt++;
 273     return 1;
 274 }
 275
 276 const BIGNUM *DH_get0_p(const DH *dh)
 277 {
 278     return dh->params.p;
 279 }
 280
 281 const BIGNUM *DH_get0_q(const DH *dh)
 282 {
 283     return dh->params.q;
 284 }
 285
 286 const BIGNUM *DH_get0_g(const DH *dh)
 287 {
 288     return dh->params.g;
 289 }
 290
 291 const BIGNUM *DH_get0_priv_key(const DH *dh)
 292 {
 293     return dh->priv_key;
 294 }
 295
 296 const BIGNUM *DH_get0_pub_key(const DH *dh)
 297 {
 298     return dh->pub_key;
 299 }
 300
 301 void DH_clear_flags(DH *dh, int flags)
 302 {
 303     dh->flags &= ~flags;
 304 }
 305
 306 int DH_test_flags(const DH *dh, int flags)
 307 {
 308     return dh->flags & flags;
 309 }
 310
 311 void DH_set_flags(DH *dh, int flags)
 312 {
 313     dh->flags |= flags;
 314 }
 315
 316 #ifndef FIPS_MODULE
 317 ENGINE *DH_get0_engine(DH *dh)
 318 {
 319     return dh->engine;
 320 }
 321 #endif /*FIPS_MODULE */
 322
 323 FFC_PARAMS *ossl_dh_get0_params(DH *dh)
 324 {
 325     return &dh->params;
 326 }
 327 int ossl_dh_get0_nid(const DH *dh)
 328 {
 329     return dh->params.nid;
 330 }