crypto/rsa/rsa_lib.c

   1 /*
   2  * Copyright 1995-2017 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 <openssl/crypto.h>
  12 #include "internal/cryptlib.h"
  13 #include "internal/refcount.h"
  14 #include "internal/bn_int.h"
  15 #include <openssl/engine.h>
  16 #include <openssl/evp.h>
  17 #include "internal/evp_int.h"
  18 #include "rsa_locl.h"
  19
  20 RSA *RSA_new(void)
  21 {
  22     return RSA_new_method(NULL);
  23 }
  24
  25 const RSA_METHOD *RSA_get_method(const RSA *rsa)
  26 {
  27     return rsa->meth;
  28 }
  29
  30 int RSA_set_method(RSA *rsa, const RSA_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 RSA_METHOD *mtmp;
  37     mtmp = rsa->meth;
  38     if (mtmp->finish)
  39         mtmp->finish(rsa);
  40 #ifndef OPENSSL_NO_ENGINE
  41     ENGINE_finish(rsa->engine);
  42     rsa->engine = NULL;
  43 #endif
  44     rsa->meth = meth;
  45     if (meth->init)
  46         meth->init(rsa);
  47     return 1;
  48 }
  49
  50 RSA *RSA_new_method(ENGINE *engine)
  51 {
  52     RSA *ret = OPENSSL_zalloc(sizeof(*ret));
  53
  54     if (ret == NULL) {
  55         RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  56         return NULL;
  57     }
  58
  59     ret->references = 1;
  60     ret->lock = CRYPTO_THREAD_lock_new();
  61     if (ret->lock == NULL) {
  62         RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  63         OPENSSL_free(ret);
  64         return NULL;
  65     }
  66
  67     ret->meth = RSA_get_default_method();
  68 #ifndef OPENSSL_NO_ENGINE
  69     ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
  70     if (engine) {
  71         if (!ENGINE_init(engine)) {
  72             RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
  73             goto err;
  74         }
  75         ret->engine = engine;
  76     } else {
  77         ret->engine = ENGINE_get_default_RSA();
  78     }
  79     if (ret->engine) {
  80         ret->meth = ENGINE_get_RSA(ret->engine);
  81         if (ret->meth == NULL) {
  82             RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
  83             goto err;
  84         }
  85     }
  86 #endif
  87
  88     ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
  89     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
  90         goto err;
  91     }
  92
  93     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
  94         RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_INIT_FAIL);
  95         goto err;
  96     }
  97
  98     return ret;
  99
 100 err:
 101     RSA_free(ret);
 102     return NULL;
 103 }
 104
 105 void RSA_free(RSA *r)
 106 {
 107     int i;
 108
 109     if (r == NULL)
 110         return;
 111
 112     CRYPTO_DOWN_REF(&r->references, &i, r->lock);
 113     REF_PRINT_COUNT("RSA", r);
 114     if (i > 0)
 115         return;
 116     REF_ASSERT_ISNT(i < 0);
 117
 118     if (r->meth->finish)
 119         r->meth->finish(r);
 120 #ifndef OPENSSL_NO_ENGINE
 121     ENGINE_finish(r->engine);
 122 #endif
 123
 124     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
 125
 126     CRYPTO_THREAD_lock_free(r->lock);
 127
 128     BN_clear_free(r->n);
 129     BN_clear_free(r->e);
 130     BN_clear_free(r->d);
 131     BN_clear_free(r->p);
 132     BN_clear_free(r->q);
 133     BN_clear_free(r->dmp1);
 134     BN_clear_free(r->dmq1);
 135     BN_clear_free(r->iqmp);
 136     RSA_PSS_PARAMS_free(r->pss);
 137     sk_RSA_PRIME_INFO_pop_free(r->prime_infos, rsa_multip_info_free);
 138     BN_BLINDING_free(r->blinding);
 139     BN_BLINDING_free(r->mt_blinding);
 140     OPENSSL_free(r->bignum_data);
 141     OPENSSL_free(r);
 142 }
 143
 144 int RSA_up_ref(RSA *r)
 145 {
 146     int i;
 147
 148     if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
 149         return 0;
 150
 151     REF_PRINT_COUNT("RSA", r);
 152     REF_ASSERT_ISNT(i < 2);
 153     return i > 1 ? 1 : 0;
 154 }
 155
 156 int RSA_set_ex_data(RSA *r, int idx, void *arg)
 157 {
 158     return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
 159 }
 160
 161 void *RSA_get_ex_data(const RSA *r, int idx)
 162 {
 163     return CRYPTO_get_ex_data(&r->ex_data, idx);
 164 }
 165
 166 int RSA_security_bits(const RSA *rsa)
 167 {
 168     int bits = BN_num_bits(rsa->n);
 169
 170     if (rsa->version == RSA_ASN1_VERSION_MULTI) {
 171         /* This ought to mean that we have private key at hand. */
 172         int ex_primes = sk_RSA_PRIME_INFO_num(rsa->prime_infos);
 173
 174         if (ex_primes <= 0 || (ex_primes + 2) > rsa_multip_cap(bits))
 175             return 0;
 176     }
 177     return BN_security_bits(bits, -1);
 178 }
 179
 180 int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
 181 {
 182     /* If the fields n and e in r are NULL, the corresponding input
 183      * parameters MUST be non-NULL for n and e.  d may be
 184      * left NULL (in case only the public key is used).
 185      */
 186     if ((r->n == NULL && n == NULL)
 187         || (r->e == NULL && e == NULL))
 188         return 0;
 189
 190     if (n != NULL) {
 191         BN_free(r->n);
 192         r->n = n;
 193     }
 194     if (e != NULL) {
 195         BN_free(r->e);
 196         r->e = e;
 197     }
 198     if (d != NULL) {
 199         BN_free(r->d);
 200         r->d = d;
 201     }
 202
 203     return 1;
 204 }
 205
 206 int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q)
 207 {
 208     /* If the fields p and q in r are NULL, the corresponding input
 209      * parameters MUST be non-NULL.
 210      */
 211     if ((r->p == NULL && p == NULL)
 212         || (r->q == NULL && q == NULL))
 213         return 0;
 214
 215     if (p != NULL) {
 216         BN_free(r->p);
 217         r->p = p;
 218     }
 219     if (q != NULL) {
 220         BN_free(r->q);
 221         r->q = q;
 222     }
 223
 224     return 1;
 225 }
 226
 227 int RSA_set0_crt_params(RSA *r, BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp)
 228 {
 229     /* If the fields dmp1, dmq1 and iqmp in r are NULL, the corresponding input
 230      * parameters MUST be non-NULL.
 231      */
 232     if ((r->dmp1 == NULL && dmp1 == NULL)
 233         || (r->dmq1 == NULL && dmq1 == NULL)
 234         || (r->iqmp == NULL && iqmp == NULL))
 235         return 0;
 236
 237     if (dmp1 != NULL) {
 238         BN_free(r->dmp1);
 239         r->dmp1 = dmp1;
 240     }
 241     if (dmq1 != NULL) {
 242         BN_free(r->dmq1);
 243         r->dmq1 = dmq1;
 244     }
 245     if (iqmp != NULL) {
 246         BN_free(r->iqmp);
 247         r->iqmp = iqmp;
 248     }
 249
 250     return 1;
 251 }
 252
 253 /*
 254  * Is it better to export RSA_PRIME_INFO structure
 255  * and related functions to let user pass a triplet?
 256  */
 257 int RSA_set0_multi_prime_params(RSA *r, BIGNUM *primes[], BIGNUM *exps[],
 258                                 BIGNUM *coeffs[], int pnum)
 259 {
 260     STACK_OF(RSA_PRIME_INFO) *prime_infos, *old = NULL;
 261     RSA_PRIME_INFO *pinfo;
 262     int i;
 263
 264     if (primes == NULL || exps == NULL || coeffs == NULL || pnum == 0)
 265         return 0;
 266
 267     prime_infos = sk_RSA_PRIME_INFO_new_reserve(NULL, pnum);
 268     if (prime_infos == NULL)
 269         return 0;
 270
 271     if (r->prime_infos != NULL)
 272         old = r->prime_infos;
 273
 274     for (i = 0; i < pnum; i++) {
 275         pinfo = rsa_multip_info_new();
 276         if (pinfo == NULL)
 277             goto err;
 278         if (primes[i] != NULL && exps[i] != NULL && coeffs[i] != NULL) {
 279             BN_free(pinfo->r);
 280             BN_free(pinfo->d);
 281             BN_free(pinfo->t);
 282             pinfo->r = primes[i];
 283             pinfo->d = exps[i];
 284             pinfo->t = coeffs[i];
 285         } else {
 286             rsa_multip_info_free(pinfo);
 287             goto err;
 288         }
 289         (void)sk_RSA_PRIME_INFO_push(prime_infos, pinfo);
 290     }
 291
 292     r->prime_infos = prime_infos;
 293
 294     if (!rsa_multip_calc_product(r)) {
 295         r->prime_infos = old;
 296         goto err;
 297     }
 298
 299     if (old != NULL) {
 300         /*
 301          * This is hard to deal with, since the old infos could
 302          * also be set by this function and r, d, t should not
 303          * be freed in that case. So currently, stay consistent
 304          * with other *set0* functions: just free it...
 305          */
 306         sk_RSA_PRIME_INFO_pop_free(old, rsa_multip_info_free);
 307     }
 308
 309     r->version = RSA_ASN1_VERSION_MULTI;
 310
 311     return 1;
 312  err:
 313     /* r, d, t should not be freed */
 314     sk_RSA_PRIME_INFO_pop_free(prime_infos, rsa_multip_info_free_ex);
 315     return 0;
 316 }
 317
 318 void RSA_get0_key(const RSA *r,
 319                   const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
 320 {
 321     if (n != NULL)
 322         *n = r->n;
 323     if (e != NULL)
 324         *e = r->e;
 325     if (d != NULL)
 326         *d = r->d;
 327 }
 328
 329 void RSA_get0_factors(const RSA *r, const BIGNUM **p, const BIGNUM **q)
 330 {
 331     if (p != NULL)
 332         *p = r->p;
 333     if (q != NULL)
 334         *q = r->q;
 335 }
 336
 337 int RSA_get_multi_prime_extra_count(const RSA *r)
 338 {
 339     int pnum;
 340
 341     pnum = sk_RSA_PRIME_INFO_num(r->prime_infos);
 342     if (pnum <= 0)
 343         pnum = 0;
 344     return pnum;
 345 }
 346
 347 int RSA_get0_multi_prime_factors(const RSA *r, const BIGNUM *primes[])
 348 {
 349     int pnum, i;
 350     RSA_PRIME_INFO *pinfo;
 351
 352     if ((pnum = RSA_get_multi_prime_extra_count(r)) == 0)
 353         return 0;
 354
 355     /*
 356      * return other primes
 357      * it's caller's responsibility to allocate oth_primes[pnum]
 358      */
 359     for (i = 0; i < pnum; i++) {
 360         pinfo = sk_RSA_PRIME_INFO_value(r->prime_infos, i);
 361         primes[i] = pinfo->r;
 362     }
 363
 364     return 1;
 365 }
 366
 367 void RSA_get0_crt_params(const RSA *r,
 368                          const BIGNUM **dmp1, const BIGNUM **dmq1,
 369                          const BIGNUM **iqmp)
 370 {
 371     if (dmp1 != NULL)
 372         *dmp1 = r->dmp1;
 373     if (dmq1 != NULL)
 374         *dmq1 = r->dmq1;
 375     if (iqmp != NULL)
 376         *iqmp = r->iqmp;
 377 }
 378
 379 int RSA_get0_multi_prime_crt_params(const RSA *r, const BIGNUM *exps[],
 380                                     const BIGNUM *coeffs[])
 381 {
 382     int pnum;
 383
 384     if ((pnum = RSA_get_multi_prime_extra_count(r)) == 0)
 385         return 0;
 386
 387     /* return other primes */
 388     if (exps != NULL || coeffs != NULL) {
 389         RSA_PRIME_INFO *pinfo;
 390         int i;
 391
 392         /* it's the user's job to guarantee the buffer length */
 393         for (i = 0; i < pnum; i++) {
 394             pinfo = sk_RSA_PRIME_INFO_value(r->prime_infos, i);
 395             if (exps != NULL)
 396                 exps[i] = pinfo->d;
 397             if (coeffs != NULL)
 398                 coeffs[i] = pinfo->t;
 399         }
 400     }
 401
 402     return 1;
 403 }
 404
 405 void RSA_clear_flags(RSA *r, int flags)
 406 {
 407     r->flags &= ~flags;
 408 }
 409
 410 int RSA_test_flags(const RSA *r, int flags)
 411 {
 412     return r->flags & flags;
 413 }
 414
 415 void RSA_set_flags(RSA *r, int flags)
 416 {
 417     r->flags |= flags;
 418 }
 419
 420 int RSA_get_version(RSA *r)
 421 {
 422     /* { two-prime(0), multi(1) } */
 423     return r->version;
 424 }
 425
 426 ENGINE *RSA_get0_engine(const RSA *r)
 427 {
 428     return r->engine;
 429 }
 430
 431 int RSA_pkey_ctx_ctrl(EVP_PKEY_CTX *ctx, int optype, int cmd, int p1, void *p2)
 432 {
 433     /* If key type not RSA or RSA-PSS return error */
 434     if (ctx != NULL && ctx->pmeth != NULL
 435         && ctx->pmeth->pkey_id != EVP_PKEY_RSA
 436         && ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
 437         return -1;
 438      return EVP_PKEY_CTX_ctrl(ctx, -1, optype, cmd, p1, p2);
 439 }