crypto/dh/dh_lib.c

   1 /*
   2  * Copyright 1995-2018 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 /*
  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 "internal/cryptlib.h"
  21 #include "internal/refcount.h"
  22 #include "crypto/dh.h"
  23 #include "dh_local.h"
  24
  25 static DH *dh_new_intern(ENGINE *engine, OPENSSL_CTX *libctx);
  26
  27 #ifndef FIPS_MODE
  28 int DH_set_method(DH *dh, const DH_METHOD *meth)
  29 {
  30     /*
  31      * NB: The caller is specifically setting a method, so it's not up to us
  32      * to deal with which ENGINE it comes from.
  33      */
  34     const DH_METHOD *mtmp;
  35     mtmp = dh->meth;
  36     if (mtmp->finish)
  37         mtmp->finish(dh);
  38 #ifndef OPENSSL_NO_ENGINE
  39     ENGINE_finish(dh->engine);
  40     dh->engine = NULL;
  41 #endif
  42     dh->meth = meth;
  43     if (meth->init)
  44         meth->init(dh);
  45     return 1;
  46 }
  47
  48 DH *DH_new(void)
  49 {
  50     return dh_new_intern(NULL, NULL);
  51 }
  52
  53 DH *DH_new_method(ENGINE *engine)
  54 {
  55     return dh_new_intern(engine, NULL);
  56 }
  57 #endif /* !FIPS_MODE */
  58
  59 DH *dh_new_with_ctx(OPENSSL_CTX *libctx)
  60 {
  61     return dh_new_intern(NULL, libctx);
  62 }
  63
  64 static DH *dh_new_intern(ENGINE *engine, OPENSSL_CTX *libctx)
  65 {
  66     DH *ret = OPENSSL_zalloc(sizeof(*ret));
  67
  68     if (ret == NULL) {
  69         DHerr(0, ERR_R_MALLOC_FAILURE);
  70         return NULL;
  71     }
  72
  73     ret->references = 1;
  74     ret->lock = CRYPTO_THREAD_lock_new();
  75     if (ret->lock == NULL) {
  76         DHerr(0, ERR_R_MALLOC_FAILURE);
  77         OPENSSL_free(ret);
  78         return NULL;
  79     }
  80
  81     ret->libctx = libctx;
  82     ret->meth = DH_get_default_method();
  83 #if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
  84     ret->flags = ret->meth->flags;  /* early default init */
  85     if (engine) {
  86         if (!ENGINE_init(engine)) {
  87             DHerr(0, ERR_R_ENGINE_LIB);
  88             goto err;
  89         }
  90         ret->engine = engine;
  91     } else
  92         ret->engine = ENGINE_get_default_DH();
  93     if (ret->engine) {
  94         ret->meth = ENGINE_get_DH(ret->engine);
  95         if (ret->meth == NULL) {
  96             DHerr(0, ERR_R_ENGINE_LIB);
  97             goto err;
  98         }
  99     }
 100 #endif
 101
 102     ret->flags = ret->meth->flags;
 103
 104 #ifndef FIPS_MODE
 105     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data))
 106         goto err;
 107 #endif /* FIPS_MODE */
 108
 109     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 110         DHerr(0, ERR_R_INIT_FAIL);
 111         goto err;
 112     }
 113
 114     return ret;
 115
 116  err:
 117     DH_free(ret);
 118     return NULL;
 119 }
 120
 121 void DH_free(DH *r)
 122 {
 123     int i;
 124
 125     if (r == NULL)
 126         return;
 127
 128     CRYPTO_DOWN_REF(&r->references, &i, r->lock);
 129     REF_PRINT_COUNT("DH", r);
 130     if (i > 0)
 131         return;
 132     REF_ASSERT_ISNT(i < 0);
 133
 134     if (r->meth != NULL && r->meth->finish != NULL)
 135         r->meth->finish(r);
 136 #if !defined(FIPS_MODE)
 137 # if !defined(OPENSSL_NO_ENGINE)
 138     ENGINE_finish(r->engine);
 139 # endif
 140     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
 141 #endif
 142
 143     CRYPTO_THREAD_lock_free(r->lock);
 144
 145     ffc_params_cleanup(&r->params);
 146     BN_clear_free(r->pub_key);
 147     BN_clear_free(r->priv_key);
 148     OPENSSL_free(r);
 149 }
 150
 151 int DH_up_ref(DH *r)
 152 {
 153     int i;
 154
 155     if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
 156         return 0;
 157
 158     REF_PRINT_COUNT("DH", r);
 159     REF_ASSERT_ISNT(i < 2);
 160     return ((i > 1) ? 1 : 0);
 161 }
 162
 163 #ifndef FIPS_MODE
 164 int DH_set_ex_data(DH *d, int idx, void *arg)
 165 {
 166     return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
 167 }
 168
 169 void *DH_get_ex_data(DH *d, int idx)
 170 {
 171     return CRYPTO_get_ex_data(&d->ex_data, idx);
 172 }
 173 #endif
 174
 175 int DH_bits(const DH *dh)
 176 {
 177     return BN_num_bits(dh->params.p);
 178 }
 179
 180 int DH_size(const DH *dh)
 181 {
 182     return BN_num_bytes(dh->params.p);
 183 }
 184
 185 int DH_security_bits(const DH *dh)
 186 {
 187     int N;
 188     if (dh->params.q != NULL)
 189         N = BN_num_bits(dh->params.q);
 190     else if (dh->length)
 191         N = dh->length;
 192     else
 193         N = -1;
 194     return BN_security_bits(BN_num_bits(dh->params.p), N);
 195 }
 196
 197 void DH_get0_pqg(const DH *dh,
 198                  const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
 199 {
 200     ffc_params_get0_pqg(&dh->params, p, q, g);
 201 }
 202
 203 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
 204 {
 205     /* If the fields p and g in d are NULL, the corresponding input
 206      * parameters MUST be non-NULL.  q may remain NULL.
 207      */
 208     if ((dh->params.p == NULL && p == NULL)
 209         || (dh->params.g == NULL && g == NULL))
 210         return 0;
 211
 212     ffc_params_set0_pqg(&dh->params, p, q, g);
 213     dh->params.nid = NID_undef;
 214     DH_get_nid(dh); /* Check if this is a named group and cache it */
 215
 216     if (q != NULL)
 217         dh->length = BN_num_bits(q);
 218
 219     dh->dirty_cnt++;
 220     return 1;
 221 }
 222
 223 long DH_get_length(const DH *dh)
 224 {
 225     return dh->length;
 226 }
 227
 228 int DH_set_length(DH *dh, long length)
 229 {
 230     dh->length = length;
 231     return 1;
 232 }
 233
 234 void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
 235 {
 236     if (pub_key != NULL)
 237         *pub_key = dh->pub_key;
 238     if (priv_key != NULL)
 239         *priv_key = dh->priv_key;
 240 }
 241
 242 int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
 243 {
 244     if (pub_key != NULL) {
 245         BN_clear_free(dh->pub_key);
 246         dh->pub_key = pub_key;
 247     }
 248     if (priv_key != NULL) {
 249         BN_clear_free(dh->priv_key);
 250         dh->priv_key = priv_key;
 251     }
 252
 253     dh->dirty_cnt++;
 254     return 1;
 255 }
 256
 257 const BIGNUM *DH_get0_p(const DH *dh)
 258 {
 259     return dh->params.p;
 260 }
 261
 262 const BIGNUM *DH_get0_q(const DH *dh)
 263 {
 264     return dh->params.q;
 265 }
 266
 267 const BIGNUM *DH_get0_g(const DH *dh)
 268 {
 269     return dh->params.g;
 270 }
 271
 272 const BIGNUM *DH_get0_priv_key(const DH *dh)
 273 {
 274     return dh->priv_key;
 275 }
 276
 277 const BIGNUM *DH_get0_pub_key(const DH *dh)
 278 {
 279     return dh->pub_key;
 280 }
 281
 282 void DH_clear_flags(DH *dh, int flags)
 283 {
 284     dh->flags &= ~flags;
 285 }
 286
 287 int DH_test_flags(const DH *dh, int flags)
 288 {
 289     return dh->flags & flags;
 290 }
 291
 292 void DH_set_flags(DH *dh, int flags)
 293 {
 294     dh->flags |= flags;
 295 }
 296
 297 #ifndef FIPS_MODE
 298 ENGINE *DH_get0_engine(DH *dh)
 299 {
 300     return dh->engine;
 301 }
 302 #endif /*FIPS_MODE */
 303
 304 FFC_PARAMS *dh_get0_params(DH *dh)
 305 {
 306     return &dh->params;
 307 }
 308 int dh_get0_nid(const DH *dh)
 309 {
 310     return dh->params.nid;
 311 }