crypto/dh/dh_lib.c

   1 /*
   2  * Copyright 1995-2018 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 <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include "internal/refcount.h"
  13 #include <openssl/bn.h>
  14 #include "dh_locl.h"
  15 #include <openssl/engine.h>
  16
  17 int DH_set_method(DH *dh, const DH_METHOD *meth)
  18 {
  19     /*
  20      * NB: The caller is specifically setting a method, so it's not up to us
  21      * to deal with which ENGINE it comes from.
  22      */
  23     const DH_METHOD *mtmp;
  24     mtmp = dh->meth;
  25     if (mtmp->finish)
  26         mtmp->finish(dh);
  27 #ifndef OPENSSL_NO_ENGINE
  28     ENGINE_finish(dh->engine);
  29     dh->engine = NULL;
  30 #endif
  31     dh->meth = meth;
  32     if (meth->init)
  33         meth->init(dh);
  34     return 1;
  35 }
  36
  37 DH *DH_new(void)
  38 {
  39     return DH_new_method(NULL);
  40 }
  41
  42 DH *DH_new_method(ENGINE *engine)
  43 {
  44     DH *ret = OPENSSL_zalloc(sizeof(*ret));
  45
  46     if (ret == NULL) {
  47         DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  48         return NULL;
  49     }
  50
  51     ret->references = 1;
  52     ret->lock = CRYPTO_THREAD_lock_new();
  53     if (ret->lock == NULL) {
  54         DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  55         OPENSSL_free(ret);
  56         return NULL;
  57     }
  58
  59     ret->meth = DH_get_default_method();
  60 #ifndef OPENSSL_NO_ENGINE
  61     ret->flags = ret->meth->flags;  /* early default init */
  62     if (engine) {
  63         if (!ENGINE_init(engine)) {
  64             DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
  65             goto err;
  66         }
  67         ret->engine = engine;
  68     } else
  69         ret->engine = ENGINE_get_default_DH();
  70     if (ret->engine) {
  71         ret->meth = ENGINE_get_DH(ret->engine);
  72         if (ret->meth == NULL) {
  73             DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
  74             goto err;
  75         }
  76     }
  77 #endif
  78
  79     ret->flags = ret->meth->flags;
  80
  81     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data))
  82         goto err;
  83
  84     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
  85         DHerr(DH_F_DH_NEW_METHOD, ERR_R_INIT_FAIL);
  86         goto err;
  87     }
  88
  89     return ret;
  90
  91  err:
  92     DH_free(ret);
  93     return NULL;
  94 }
  95
  96 void DH_free(DH *r)
  97 {
  98     int i;
  99
 100     if (r == NULL)
 101         return;
 102
 103     CRYPTO_DOWN_REF(&r->references, &i, r->lock);
 104     REF_PRINT_COUNT("DH", r);
 105     if (i > 0)
 106         return;
 107     REF_ASSERT_ISNT(i < 0);
 108
 109     if (r->meth != NULL && r->meth->finish != NULL)
 110         r->meth->finish(r);
 111 #ifndef OPENSSL_NO_ENGINE
 112     ENGINE_finish(r->engine);
 113 #endif
 114
 115     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
 116
 117     CRYPTO_THREAD_lock_free(r->lock);
 118
 119     BN_clear_free(r->p);
 120     BN_clear_free(r->g);
 121     BN_clear_free(r->q);
 122     BN_clear_free(r->j);
 123     OPENSSL_free(r->seed);
 124     BN_clear_free(r->counter);
 125     BN_clear_free(r->pub_key);
 126     BN_clear_free(r->priv_key);
 127     OPENSSL_free(r);
 128 }
 129
 130 int DH_up_ref(DH *r)
 131 {
 132     int i;
 133
 134     if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
 135         return 0;
 136
 137     REF_PRINT_COUNT("DH", r);
 138     REF_ASSERT_ISNT(i < 2);
 139     return ((i > 1) ? 1 : 0);
 140 }
 141
 142 int DH_set_ex_data(DH *d, int idx, void *arg)
 143 {
 144     return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
 145 }
 146
 147 void *DH_get_ex_data(DH *d, int idx)
 148 {
 149     return CRYPTO_get_ex_data(&d->ex_data, idx);
 150 }
 151
 152 int DH_bits(const DH *dh)
 153 {
 154     return BN_num_bits(dh->p);
 155 }
 156
 157 int DH_size(const DH *dh)
 158 {
 159     return BN_num_bytes(dh->p);
 160 }
 161
 162 int DH_security_bits(const DH *dh)
 163 {
 164     int N;
 165     if (dh->q)
 166         N = BN_num_bits(dh->q);
 167     else if (dh->length)
 168         N = dh->length;
 169     else
 170         N = -1;
 171     return BN_security_bits(BN_num_bits(dh->p), N);
 172 }
 173
 174
 175 void DH_get0_pqg(const DH *dh,
 176                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
 177 {
 178     if (p != NULL)
 179         *p = dh->p;
 180     if (q != NULL)
 181         *q = dh->q;
 182     if (g != NULL)
 183         *g = dh->g;
 184 }
 185
 186 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
 187 {
 188     /* If the fields p and g in d are NULL, the corresponding input
 189      * parameters MUST be non-NULL.  q may remain NULL.
 190      */
 191     if ((dh->p == NULL && p == NULL)
 192         || (dh->g == NULL && g == NULL))
 193         return 0;
 194
 195     if (p != NULL) {
 196         BN_free(dh->p);
 197         dh->p = p;
 198     }
 199     if (q != NULL) {
 200         BN_free(dh->q);
 201         dh->q = q;
 202     }
 203     if (g != NULL) {
 204         BN_free(dh->g);
 205         dh->g = g;
 206     }
 207
 208     if (q != NULL) {
 209         dh->length = BN_num_bits(q);
 210     }
 211
 212     return 1;
 213 }
 214
 215 long DH_get_length(const DH *dh)
 216 {
 217     return dh->length;
 218 }
 219
 220 int DH_set_length(DH *dh, long length)
 221 {
 222     dh->length = length;
 223     return 1;
 224 }
 225
 226 void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
 227 {
 228     if (pub_key != NULL)
 229         *pub_key = dh->pub_key;
 230     if (priv_key != NULL)
 231         *priv_key = dh->priv_key;
 232 }
 233
 234 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
 235 {
 236     if (pub_key != NULL) {
 237         BN_free(dh->pub_key);
 238         dh->pub_key = pub_key;
 239     }
 240     if (priv_key != NULL) {
 241         BN_free(dh->priv_key);
 242         dh->priv_key = priv_key;
 243     }
 244
 245     return 1;
 246 }
 247
 248 const BIGNUM *DH_get0_p(const DH *dh)
 249 {
 250     return dh->p;
 251 }
 252
 253 const BIGNUM *DH_get0_q(const DH *dh)
 254 {
 255     return dh->q;
 256 }
 257
 258 const BIGNUM *DH_get0_g(const DH *dh)
 259 {
 260     return dh->g;
 261 }
 262
 263 const BIGNUM *DH_get0_priv_key(const DH *dh)
 264 {
 265     return dh->priv_key;
 266 }
 267
 268 const BIGNUM *DH_get0_pub_key(const DH *dh)
 269 {
 270     return dh->pub_key;
 271 }
 272
 273 void DH_clear_flags(DH *dh, int flags)
 274 {
 275     dh->flags &= ~flags;
 276 }
 277
 278 int DH_test_flags(const DH *dh, int flags)
 279 {
 280     return dh->flags & flags;
 281 }
 282
 283 void DH_set_flags(DH *dh, int flags)
 284 {
 285     dh->flags |= flags;
 286 }
 287
 288 ENGINE *DH_get0_engine(DH *dh)
 289 {
 290     return dh->engine;
 291 }