crypto/dh/dh_lib.c

   1 /*
   2  * Copyright 1995-2020 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 #include <openssl/engine.h>
  19 #include <openssl/obj_mac.h>
  20 #include <openssl/core_names.h>
  21 #include "internal/cryptlib.h"
  22 #include "internal/refcount.h"
  23 #include "crypto/evp.h"
  24 #include "crypto/dh.h"
  25 #include "dh_local.h"
  26
  27 static DH *dh_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx);
  28
  29 #ifndef FIPS_MODULE
  30 int DH_set_method(DH *dh, const DH_METHOD *meth)
  31 {
  32     /*
  33      * NB: The caller is specifically setting a method, so it's not up to us
  34      * to deal with which ENGINE it comes from.
  35      */
  36     const DH_METHOD *mtmp;
  37     mtmp = dh->meth;
  38     if (mtmp->finish)
  39         mtmp->finish(dh);
  40 #ifndef OPENSSL_NO_ENGINE
  41     ENGINE_finish(dh->engine);
  42     dh->engine = NULL;
  43 #endif
  44     dh->meth = meth;
  45     if (meth->init)
  46         meth->init(dh);
  47     return 1;
  48 }
  49
  50 const DH_METHOD *dh_get_method(const DH *dh)
  51 {
  52     return dh->meth;
  53 }
  54 # ifndef OPENSSL_NO_DEPRECATED_3_0
  55 DH *DH_new(void)
  56 {
  57     return dh_new_intern(NULL, NULL);
  58 }
  59 # endif
  60
  61 DH *DH_new_method(ENGINE *engine)
  62 {
  63     return dh_new_intern(engine, NULL);
  64 }
  65 #endif /* !FIPS_MODULE */
  66
  67 DH *dh_new_ex(OSSL_LIB_CTX *libctx)
  68 {
  69     return dh_new_intern(NULL, libctx);
  70 }
  71
  72 static DH *dh_new_intern(ENGINE *engine, OSSL_LIB_CTX *libctx)
  73 {
  74     DH *ret = OPENSSL_zalloc(sizeof(*ret));
  75
  76     if (ret == NULL) {
  77         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
  78         return NULL;
  79     }
  80
  81     ret->references = 1;
  82     ret->lock = CRYPTO_THREAD_lock_new();
  83     if (ret->lock == NULL) {
  84         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
  85         OPENSSL_free(ret);
  86         return NULL;
  87     }
  88
  89     ret->libctx = libctx;
  90     ret->meth = DH_get_default_method();
  91 #if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
  92     ret->flags = ret->meth->flags;  /* early default init */
  93     if (engine) {
  94         if (!ENGINE_init(engine)) {
  95             ERR_raise(ERR_LIB_DH, ERR_R_ENGINE_LIB);
  96             goto err;
  97         }
  98         ret->engine = engine;
  99     } else
 100         ret->engine = ENGINE_get_default_DH();
 101     if (ret->engine) {
 102         ret->meth = ENGINE_get_DH(ret->engine);
 103         if (ret->meth == NULL) {
 104             ERR_raise(ERR_LIB_DH, ERR_R_ENGINE_LIB);
 105             goto err;
 106         }
 107     }
 108 #endif
 109
 110     ret->flags = ret->meth->flags;
 111
 112 #ifndef FIPS_MODULE
 113     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data))
 114         goto err;
 115 #endif /* FIPS_MODULE */
 116
 117     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 118         ERR_raise(ERR_LIB_DH, ERR_R_INIT_FAIL);
 119         goto err;
 120     }
 121
 122     return ret;
 123
 124  err:
 125     DH_free(ret);
 126     return NULL;
 127 }
 128
 129 void DH_free(DH *r)
 130 {
 131     int i;
 132
 133     if (r == NULL)
 134         return;
 135
 136     CRYPTO_DOWN_REF(&r->references, &i, r->lock);
 137     REF_PRINT_COUNT("DH", r);
 138     if (i > 0)
 139         return;
 140     REF_ASSERT_ISNT(i < 0);
 141
 142     if (r->meth != NULL && r->meth->finish != NULL)
 143         r->meth->finish(r);
 144 #if !defined(FIPS_MODULE)
 145 # if !defined(OPENSSL_NO_ENGINE)
 146     ENGINE_finish(r->engine);
 147 # endif
 148     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
 149 #endif
 150
 151     CRYPTO_THREAD_lock_free(r->lock);
 152
 153     ossl_ffc_params_cleanup(&r->params);
 154     BN_clear_free(r->pub_key);
 155     BN_clear_free(r->priv_key);
 156     OPENSSL_free(r);
 157 }
 158
 159 int DH_up_ref(DH *r)
 160 {
 161     int i;
 162
 163     if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
 164         return 0;
 165
 166     REF_PRINT_COUNT("DH", r);
 167     REF_ASSERT_ISNT(i < 2);
 168     return ((i > 1) ? 1 : 0);
 169 }
 170
 171 void ossl_dh_set0_libctx(DH *d, OSSL_LIB_CTX *libctx)
 172 {
 173     d->libctx = libctx;
 174 }
 175
 176 #ifndef FIPS_MODULE
 177 int DH_set_ex_data(DH *d, int idx, void *arg)
 178 {
 179     return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
 180 }
 181
 182 void *DH_get_ex_data(const DH *d, int idx)
 183 {
 184     return CRYPTO_get_ex_data(&d->ex_data, idx);
 185 }
 186 #endif
 187
 188 int DH_bits(const DH *dh)
 189 {
 190     if (dh->params.p != NULL)
 191         return BN_num_bits(dh->params.p);
 192     return -1;
 193 }
 194
 195 int DH_size(const DH *dh)
 196 {
 197     if (dh->params.p != NULL)
 198         return BN_num_bytes(dh->params.p);
 199     return -1;
 200 }
 201
 202 int DH_security_bits(const DH *dh)
 203 {
 204     int N;
 205     if (dh->params.q != NULL)
 206         N = BN_num_bits(dh->params.q);
 207     else if (dh->length)
 208         N = dh->length;
 209     else
 210         N = -1;
 211     if (dh->params.p != NULL)
 212         return BN_security_bits(BN_num_bits(dh->params.p), N);
 213     return -1;
 214 }
 215
 216 void DH_get0_pqg(const DH *dh,
 217                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
 218 {
 219     ossl_ffc_params_get0_pqg(&dh->params, p, q, g);
 220 }
 221
 222 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
 223 {
 224     /*
 225      * If the fields p and g in dh are NULL, the corresponding input
 226      * parameters MUST be non-NULL.  q may remain NULL.
 227      */
 228     if ((dh->params.p == NULL && p == NULL)
 229         || (dh->params.g == NULL && g == NULL))
 230         return 0;
 231
 232     ossl_ffc_params_set0_pqg(&dh->params, p, q, g);
 233     dh_cache_named_group(dh);
 234     dh->dirty_cnt++;
 235     return 1;
 236 }
 237
 238 long DH_get_length(const DH *dh)
 239 {
 240     return dh->length;
 241 }
 242
 243 int DH_set_length(DH *dh, long length)
 244 {
 245     dh->length = length;
 246     dh->dirty_cnt++;
 247     return 1;
 248 }
 249
 250 void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
 251 {
 252     if (pub_key != NULL)
 253         *pub_key = dh->pub_key;
 254     if (priv_key != NULL)
 255         *priv_key = dh->priv_key;
 256 }
 257
 258 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
 259 {
 260     if (pub_key != NULL) {
 261         BN_clear_free(dh->pub_key);
 262         dh->pub_key = pub_key;
 263     }
 264     if (priv_key != NULL) {
 265         BN_clear_free(dh->priv_key);
 266         dh->priv_key = priv_key;
 267     }
 268
 269     dh->dirty_cnt++;
 270     return 1;
 271 }
 272
 273 const BIGNUM *DH_get0_p(const DH *dh)
 274 {
 275     return dh->params.p;
 276 }
 277
 278 const BIGNUM *DH_get0_q(const DH *dh)
 279 {
 280     return dh->params.q;
 281 }
 282
 283 const BIGNUM *DH_get0_g(const DH *dh)
 284 {
 285     return dh->params.g;
 286 }
 287
 288 const BIGNUM *DH_get0_priv_key(const DH *dh)
 289 {
 290     return dh->priv_key;
 291 }
 292
 293 const BIGNUM *DH_get0_pub_key(const DH *dh)
 294 {
 295     return dh->pub_key;
 296 }
 297
 298 void DH_clear_flags(DH *dh, int flags)
 299 {
 300     dh->flags &= ~flags;
 301 }
 302
 303 int DH_test_flags(const DH *dh, int flags)
 304 {
 305     return dh->flags & flags;
 306 }
 307
 308 void DH_set_flags(DH *dh, int flags)
 309 {
 310     dh->flags |= flags;
 311 }
 312
 313 #ifndef FIPS_MODULE
 314 ENGINE *DH_get0_engine(DH *dh)
 315 {
 316     return dh->engine;
 317 }
 318 #endif /*FIPS_MODULE */
 319
 320 FFC_PARAMS *dh_get0_params(DH *dh)
 321 {
 322     return &dh->params;
 323 }
 324 int dh_get0_nid(const DH *dh)
 325 {
 326     return dh->params.nid;
 327 }