crypto/dsa/dsa_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  * DSA 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 "internal/cryptlib.h"
  18 #include "internal/refcount.h"
  19 #include <openssl/bn.h>
  20 #include <openssl/asn1.h>
  21 #include <openssl/engine.h>
  22 #include "dsa_local.h"
  23 #include "crypto/dsa.h"
  24 #include "crypto/dh.h" /* required by DSA_dup_DH() */
  25
  26 static DSA *dsa_new_intern(ENGINE *engine, OPENSSL_CTX *libctx);
  27
  28 #ifndef FIPS_MODE
  29
  30 int DSA_set_ex_data(DSA *d, int idx, void *arg)
  31 {
  32     return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
  33 }
  34
  35 void *DSA_get_ex_data(const DSA *d, int idx)
  36 {
  37     return CRYPTO_get_ex_data(&d->ex_data, idx);
  38 }
  39
  40 # ifndef OPENSSL_NO_DH
  41 DH *DSA_dup_DH(const DSA *r)
  42 {
  43     /*
  44      * DSA has p, q, g, optional pub_key, optional priv_key.
  45      * DH has p, optional length, g, optional pub_key,
  46      * optional priv_key, optional q.
  47      */
  48     DH *ret = NULL;
  49     BIGNUM *pub_key = NULL, *priv_key = NULL;
  50
  51     if (r == NULL)
  52         goto err;
  53     ret = DH_new();
  54     if (ret == NULL)
  55         goto err;
  56
  57     if (!ffc_params_copy(dh_get0_params(ret), &r->params))
  58         goto err;
  59
  60     if (r->pub_key != NULL) {
  61         pub_key = BN_dup(r->pub_key);
  62         if (pub_key == NULL)
  63             goto err;
  64         if (r->priv_key != NULL) {
  65             priv_key = BN_dup(r->priv_key);
  66             if (priv_key == NULL)
  67                 goto err;
  68         }
  69         if (!DH_set0_key(ret, pub_key, priv_key))
  70             goto err;
  71     } else if (r->priv_key != NULL) {
  72         /* Shouldn't happen */
  73         goto err;
  74     }
  75
  76     return ret;
  77
  78  err:
  79     BN_free(pub_key);
  80     BN_free(priv_key);
  81     DH_free(ret);
  82     return NULL;
  83 }
  84 # endif /*  OPENSSL_NO_DH */
  85
  86 void DSA_clear_flags(DSA *d, int flags)
  87 {
  88     d->flags &= ~flags;
  89 }
  90
  91 int DSA_test_flags(const DSA *d, int flags)
  92 {
  93     return d->flags & flags;
  94 }
  95
  96 void DSA_set_flags(DSA *d, int flags)
  97 {
  98     d->flags |= flags;
  99 }
 100
 101 ENGINE *DSA_get0_engine(DSA *d)
 102 {
 103     return d->engine;
 104 }
 105
 106 int DSA_set_method(DSA *dsa, const DSA_METHOD *meth)
 107 {
 108     /*
 109      * NB: The caller is specifically setting a method, so it's not up to us
 110      * to deal with which ENGINE it comes from.
 111      */
 112     const DSA_METHOD *mtmp;
 113     mtmp = dsa->meth;
 114     if (mtmp->finish)
 115         mtmp->finish(dsa);
 116 #ifndef OPENSSL_NO_ENGINE
 117     ENGINE_finish(dsa->engine);
 118     dsa->engine = NULL;
 119 #endif
 120     dsa->meth = meth;
 121     if (meth->init)
 122         meth->init(dsa);
 123     return 1;
 124 }
 125 #endif /* FIPS_MODE */
 126
 127
 128 const DSA_METHOD *DSA_get_method(DSA *d)
 129 {
 130     return d->meth;
 131 }
 132
 133 static DSA *dsa_new_intern(ENGINE *engine, OPENSSL_CTX *libctx)
 134 {
 135     DSA *ret = OPENSSL_zalloc(sizeof(*ret));
 136
 137     if (ret == NULL) {
 138         DSAerr(0, ERR_R_MALLOC_FAILURE);
 139         return NULL;
 140     }
 141
 142     ret->references = 1;
 143     ret->lock = CRYPTO_THREAD_lock_new();
 144     if (ret->lock == NULL) {
 145         DSAerr(0, ERR_R_MALLOC_FAILURE);
 146         OPENSSL_free(ret);
 147         return NULL;
 148     }
 149
 150     ret->libctx = libctx;
 151     ret->meth = DSA_get_default_method();
 152 #if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
 153     ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW; /* early default init */
 154     if (engine) {
 155         if (!ENGINE_init(engine)) {
 156             DSAerr(0, ERR_R_ENGINE_LIB);
 157             goto err;
 158         }
 159         ret->engine = engine;
 160     } else
 161         ret->engine = ENGINE_get_default_DSA();
 162     if (ret->engine) {
 163         ret->meth = ENGINE_get_DSA(ret->engine);
 164         if (ret->meth == NULL) {
 165             DSAerr(0, ERR_R_ENGINE_LIB);
 166             goto err;
 167         }
 168     }
 169 #endif
 170
 171     ret->flags = ret->meth->flags & ~DSA_FLAG_NON_FIPS_ALLOW;
 172
 173 #ifndef FIPS_MODE
 174     if (!crypto_new_ex_data_ex(libctx, CRYPTO_EX_INDEX_DSA, ret, &ret->ex_data))
 175         goto err;
 176 #endif
 177
 178     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 179         DSAerr(0, ERR_R_INIT_FAIL);
 180         goto err;
 181     }
 182
 183     return ret;
 184
 185  err:
 186     DSA_free(ret);
 187     return NULL;
 188 }
 189
 190 DSA *DSA_new_method(ENGINE *engine)
 191 {
 192     return dsa_new_intern(engine, NULL);
 193 }
 194
 195 DSA *dsa_new_with_ctx(OPENSSL_CTX *libctx)
 196 {
 197     return dsa_new_intern(NULL, libctx);
 198 }
 199
 200 #ifndef FIPS_MODE
 201 DSA *DSA_new(void)
 202 {
 203     return dsa_new_intern(NULL, NULL);
 204 }
 205 #endif
 206
 207 void DSA_free(DSA *r)
 208 {
 209     int i;
 210
 211     if (r == NULL)
 212         return;
 213
 214     CRYPTO_DOWN_REF(&r->references, &i, r->lock);
 215     REF_PRINT_COUNT("DSA", r);
 216     if (i > 0)
 217         return;
 218     REF_ASSERT_ISNT(i < 0);
 219
 220     if (r->meth != NULL && r->meth->finish != NULL)
 221         r->meth->finish(r);
 222 #if !defined(FIPS_MODE) && !defined(OPENSSL_NO_ENGINE)
 223     ENGINE_finish(r->engine);
 224 #endif
 225
 226 #ifndef FIPS_MODE
 227     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DSA, r, &r->ex_data);
 228 #endif
 229
 230     CRYPTO_THREAD_lock_free(r->lock);
 231
 232     ffc_params_cleanup(&r->params);
 233     BN_clear_free(r->pub_key);
 234     BN_clear_free(r->priv_key);
 235     OPENSSL_free(r);
 236 }
 237
 238 int DSA_up_ref(DSA *r)
 239 {
 240     int i;
 241
 242     if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
 243         return 0;
 244
 245     REF_PRINT_COUNT("DSA", r);
 246     REF_ASSERT_ISNT(i < 2);
 247     return ((i > 1) ? 1 : 0);
 248 }
 249
 250 void DSA_get0_pqg(const DSA *d,
 251                   const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
 252 {
 253     ffc_params_get0_pqg(&d->params, p, q, g);
 254 }
 255
 256 int DSA_set0_pqg(DSA *d, BIGNUM *p, BIGNUM *q, BIGNUM *g)
 257 {
 258     /* If the fields p, q and g in d are NULL, the corresponding input
 259      * parameters MUST be non-NULL.
 260      */
 261     if ((d->params.p == NULL && p == NULL)
 262         || (d->params.q == NULL && q == NULL)
 263         || (d->params.g == NULL && g == NULL))
 264         return 0;
 265
 266     ffc_params_set0_pqg(&d->params, p, q, g);
 267     d->dirty_cnt++;
 268
 269     return 1;
 270 }
 271
 272 const BIGNUM *DSA_get0_p(const DSA *d)
 273 {
 274     return d->params.p;
 275 }
 276
 277 const BIGNUM *DSA_get0_q(const DSA *d)
 278 {
 279     return d->params.q;
 280 }
 281
 282 const BIGNUM *DSA_get0_g(const DSA *d)
 283 {
 284     return d->params.g;
 285 }
 286
 287 const BIGNUM *DSA_get0_pub_key(const DSA *d)
 288 {
 289     return d->pub_key;
 290 }
 291
 292 const BIGNUM *DSA_get0_priv_key(const DSA *d)
 293 {
 294     return d->priv_key;
 295 }
 296
 297 void DSA_get0_key(const DSA *d,
 298                   const BIGNUM **pub_key, const BIGNUM **priv_key)
 299 {
 300     if (pub_key != NULL)
 301         *pub_key = d->pub_key;
 302     if (priv_key != NULL)
 303         *priv_key = d->priv_key;
 304 }
 305
 306 int DSA_set0_key(DSA *d, BIGNUM *pub_key, BIGNUM *priv_key)
 307 {
 308     /* If the field pub_key in d is NULL, the corresponding input
 309      * parameters MUST be non-NULL.  The priv_key field may
 310      * be left NULL.
 311      */
 312     if (d->pub_key == NULL && pub_key == NULL)
 313         return 0;
 314
 315     if (pub_key != NULL) {
 316         BN_free(d->pub_key);
 317         d->pub_key = pub_key;
 318     }
 319     if (priv_key != NULL) {
 320         BN_free(d->priv_key);
 321         d->priv_key = priv_key;
 322     }
 323     d->dirty_cnt++;
 324
 325     return 1;
 326 }
 327
 328 int DSA_security_bits(const DSA *d)
 329 {
 330     if (d->params.p != NULL && d->params.q != NULL)
 331         return BN_security_bits(BN_num_bits(d->params.p),
 332                                 BN_num_bits(d->params.q));
 333     return -1;
 334 }
 335
 336 int DSA_bits(const DSA *dsa)
 337 {
 338     return BN_num_bits(dsa->params.p);
 339 }
 340
 341 FFC_PARAMS *dsa_get0_params(DSA *dsa)
 342 {
 343     return &dsa->params;
 344 }