crypto/rsa/rsa_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 #include <stdio.h>
  11 #include <openssl/crypto.h>
  12 #include <openssl/core_names.h>
  13 #include <openssl/engine.h>
  14 #include <openssl/evp.h>
  15 #include "internal/cryptlib.h"
  16 #include "internal/refcount.h"
  17 #include "crypto/bn.h"
  18 #include "crypto/evp.h"
  19 #include "crypto/rsa.h"
  20 #include "rsa_local.h"
  21
  22 RSA *RSA_new(void)
  23 {
  24     return RSA_new_method(NULL);
  25 }
  26
  27 const RSA_METHOD *RSA_get_method(const RSA *rsa)
  28 {
  29     return rsa->meth;
  30 }
  31
  32 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
  33 {
  34     /*
  35      * NB: The caller is specifically setting a method, so it's not up to us
  36      * to deal with which ENGINE it comes from.
  37      */
  38     const RSA_METHOD *mtmp;
  39     mtmp = rsa->meth;
  40     if (mtmp->finish)
  41         mtmp->finish(rsa);
  42 #ifndef OPENSSL_NO_ENGINE
  43     ENGINE_finish(rsa->engine);
  44     rsa->engine = NULL;
  45 #endif
  46     rsa->meth = meth;
  47     if (meth->init)
  48         meth->init(rsa);
  49     return 1;
  50 }
  51
  52 RSA *RSA_new_method(ENGINE *engine)
  53 {
  54     RSA *ret = OPENSSL_zalloc(sizeof(*ret));
  55
  56     if (ret == NULL) {
  57         RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  58         return NULL;
  59     }
  60
  61     ret->references = 1;
  62     ret->lock = CRYPTO_THREAD_lock_new();
  63     if (ret->lock == NULL) {
  64         RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  65         OPENSSL_free(ret);
  66         return NULL;
  67     }
  68
  69     ret->meth = RSA_get_default_method();
  70 #ifndef OPENSSL_NO_ENGINE
  71     ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
  72     if (engine) {
  73         if (!ENGINE_init(engine)) {
  74             RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
  75             goto err;
  76         }
  77         ret->engine = engine;
  78     } else {
  79         ret->engine = ENGINE_get_default_RSA();
  80     }
  81     if (ret->engine) {
  82         ret->meth = ENGINE_get_RSA(ret->engine);
  83         if (ret->meth == NULL) {
  84             RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
  85             goto err;
  86         }
  87     }
  88 #endif
  89
  90     ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
  91     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
  92         goto err;
  93     }
  94
  95     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
  96         RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_INIT_FAIL);
  97         goto err;
  98     }
  99
 100     return ret;
 101
 102  err:
 103     RSA_free(ret);
 104     return NULL;
 105 }
 106
 107 void RSA_free(RSA *r)
 108 {
 109     int i;
 110
 111     if (r == NULL)
 112         return;
 113
 114     CRYPTO_DOWN_REF(&r->references, &i, r->lock);
 115     REF_PRINT_COUNT("RSA", r);
 116     if (i > 0)
 117         return;
 118     REF_ASSERT_ISNT(i < 0);
 119
 120     if (r->meth != NULL && r->meth->finish != NULL)
 121         r->meth->finish(r);
 122 #ifndef OPENSSL_NO_ENGINE
 123     ENGINE_finish(r->engine);
 124 #endif
 125
 126     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
 127
 128     CRYPTO_THREAD_lock_free(r->lock);
 129
 130     BN_free(r->n);
 131     BN_free(r->e);
 132     BN_clear_free(r->d);
 133     BN_clear_free(r->p);
 134     BN_clear_free(r->q);
 135     BN_clear_free(r->dmp1);
 136     BN_clear_free(r->dmq1);
 137     BN_clear_free(r->iqmp);
 138     RSA_PSS_PARAMS_free(r->pss);
 139     sk_RSA_PRIME_INFO_pop_free(r->prime_infos, rsa_multip_info_free);
 140     BN_BLINDING_free(r->blinding);
 141     BN_BLINDING_free(r->mt_blinding);
 142     OPENSSL_free(r->bignum_data);
 143     OPENSSL_free(r);
 144 }
 145
 146 int RSA_up_ref(RSA *r)
 147 {
 148     int i;
 149
 150     if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
 151         return 0;
 152
 153     REF_PRINT_COUNT("RSA", r);
 154     REF_ASSERT_ISNT(i < 2);
 155     return i > 1 ? 1 : 0;
 156 }
 157
 158 int RSA_set_ex_data(RSA *r, int idx, void *arg)
 159 {
 160     return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
 161 }
 162
 163 void *RSA_get_ex_data(const RSA *r, int idx)
 164 {
 165     return CRYPTO_get_ex_data(&r->ex_data, idx);
 166 }
 167
 168 /*
 169  * Define a scaling constant for our fixed point arithmetic.
 170  * This value must be a power of two because the base two logarithm code
 171  * makes this assumption.  The exponent must also be a multiple of three so
 172  * that the scale factor has an exact cube root.  Finally, the scale factor
 173  * should not be so large that a multiplication of two scaled numbers
 174  * overflows a 64 bit unsigned integer.
 175  */
 176 static const unsigned int scale = 1 << 18;
 177 static const unsigned int cbrt_scale = 1 << (2 * 18 / 3);
 178
 179 /* Define some constants, none exceed 32 bits */
 180 static const unsigned int log_2  = 0x02c5c8;    /* scale * log(2) */
 181 static const unsigned int log_e  = 0x05c551;    /* scale * log2(M_E) */
 182 static const unsigned int c1_923 = 0x07b126;    /* scale * 1.923 */
 183 static const unsigned int c4_690 = 0x12c28f;    /* scale * 4.690 */
 184
 185 /*
 186  * Multiply two scaled integers together and rescale the result.
 187  */
 188 static ossl_inline uint64_t mul2(uint64_t a, uint64_t b)
 189 {
 190     return a * b / scale;
 191 }
 192
 193 /*
 194  * Calculate the cube root of a 64 bit scaled integer.
 195  * Although the cube root of a 64 bit number does fit into a 32 bit unsigned
 196  * integer, this is not guaranteed after scaling, so this function has a
 197  * 64 bit return.  This uses the shifting nth root algorithm with some
 198  * algebraic simplifications.
 199  */
 200 static uint64_t icbrt64(uint64_t x)
 201 {
 202     uint64_t r = 0;
 203     uint64_t b;
 204     int s;
 205
 206     for (s = 63; s >= 0; s -= 3) {
 207         r <<= 1;
 208         b = 3 * r * (r + 1) + 1;
 209         if ((x >> s) >= b) {
 210             x -= b << s;
 211             r++;
 212         }
 213     }
 214     return r * cbrt_scale;
 215 }
 216
 217 /*
 218  * Calculate the natural logarithm of a 64 bit scaled integer.
 219  * This is done by calculating a base two logarithm and scaling.
 220  * The maximum logarithm (base 2) is 64 and this reduces base e, so
 221  * a 32 bit result should not overflow.  The argument passed must be
 222  * greater than unity so we don't need to handle negative results.
 223  */
 224 static uint32_t ilog_e(uint64_t v)
 225 {
 226     uint32_t i, r = 0;
 227
 228     /*
 229      * Scale down the value into the range 1 .. 2.
 230      *
 231      * If fractional numbers need to be processed, another loop needs
 232      * to go here that checks v < scale and if so multiplies it by 2 and
 233      * reduces r by scale.  This also means making r signed.
 234      */
 235     while (v >= 2 * scale) {
 236         v >>= 1;
 237         r += scale;
 238     }
 239     for (i = scale / 2; i != 0; i /= 2) {
 240         v = mul2(v, v);
 241         if (v >= 2 * scale) {
 242             v >>= 1;
 243             r += i;
 244         }
 245     }
 246     r = (r * (uint64_t)scale) / log_e;
 247     return r;
 248 }
 249
 250 /*
 251  * NIST SP 800-56B rev 2 Appendix D: Maximum Security Strength Estimates for IFC
 252  * Modulus Lengths.
 253  *
 254  * E = \frac{1.923 \sqrt[3]{nBits \cdot log_e(2)}
 255  *           \cdot(log_e(nBits \cdot log_e(2))^{2/3} - 4.69}{log_e(2)}
 256  * The two cube roots are merged together here.
 257  */
 258 uint16_t rsa_compute_security_bits(int n)
 259 {
 260     uint64_t x;
 261     uint32_t lx;
 262     uint16_t y;
 263
 264     /* Look for common values as listed in SP 800-56B rev 2 Appendix D */
 265     switch (n) {
 266     case 2048:
 267         return 112;
 268     case 3072:
 269         return 128;
 270     case 4096:
 271         return 152;
 272     case 6144:
 273         return 176;
 274     case 8192:
 275         return 200;
 276     }
 277     /*
 278      * The first incorrect result (i.e. not accurate or off by one low) occurs
 279      * for n = 699668.  The true value here is 1200.  Instead of using this n
 280      * as the check threshold, the smallest n such that the correct result is
 281      * 1200 is used instead.
 282      */
 283     if (n >= 687737)
 284         return 1200;
 285     if (n < 8)
 286         return 0;
 287
 288     x = n * (uint64_t)log_2;
 289     lx = ilog_e(x);
 290     y = (uint16_t)((mul2(c1_923, icbrt64(mul2(mul2(x, lx), lx))) - c4_690)
 291                    / log_2);
 292     return (y + 4) & ~7;
 293 }
 294
 295 int RSA_security_bits(const RSA *rsa)
 296 {
 297     int bits = BN_num_bits(rsa->n);
 298
 299     if (rsa->version == RSA_ASN1_VERSION_MULTI) {
 300         /* This ought to mean that we have private key at hand. */
 301         int ex_primes = sk_RSA_PRIME_INFO_num(rsa->prime_infos);
 302
 303         if (ex_primes <= 0 || (ex_primes + 2) > rsa_multip_cap(bits))
 304             return 0;
 305     }
 306     return rsa_compute_security_bits(bits);
 307 }
 308
 309 int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
 310 {
 311     /* If the fields n and e in r are NULL, the corresponding input
 312      * parameters MUST be non-NULL for n and e.  d may be
 313      * left NULL (in case only the public key is used).
 314      */
 315     if ((r->n == NULL && n == NULL)
 316         || (r->e == NULL && e == NULL))
 317         return 0;
 318
 319     if (n != NULL) {
 320         BN_free(r->n);
 321         r->n = n;
 322     }
 323     if (e != NULL) {
 324         BN_free(r->e);
 325         r->e = e;
 326     }
 327     if (d != NULL) {
 328         BN_clear_free(r->d);
 329         r->d = d;
 330         BN_set_flags(r->d, BN_FLG_CONSTTIME);
 331     }
 332     r->dirty_cnt++;
 333
 334     return 1;
 335 }
 336
 337 int RSA_set0_factors(RSA *r, BIGNUM *p, BIGNUM *q)
 338 {
 339     /* If the fields p and q in r are NULL, the corresponding input
 340      * parameters MUST be non-NULL.
 341      */
 342     if ((r->p == NULL && p == NULL)
 343         || (r->q == NULL && q == NULL))
 344         return 0;
 345
 346     if (p != NULL) {
 347         BN_clear_free(r->p);
 348         r->p = p;
 349         BN_set_flags(r->p, BN_FLG_CONSTTIME);
 350     }
 351     if (q != NULL) {
 352         BN_clear_free(r->q);
 353         r->q = q;
 354         BN_set_flags(r->q, BN_FLG_CONSTTIME);
 355     }
 356     r->dirty_cnt++;
 357
 358     return 1;
 359 }
 360
 361 int RSA_set0_crt_params(RSA *r, BIGNUM *dmp1, BIGNUM *dmq1, BIGNUM *iqmp)
 362 {
 363     /* If the fields dmp1, dmq1 and iqmp in r are NULL, the corresponding input
 364      * parameters MUST be non-NULL.
 365      */
 366     if ((r->dmp1 == NULL && dmp1 == NULL)
 367         || (r->dmq1 == NULL && dmq1 == NULL)
 368         || (r->iqmp == NULL && iqmp == NULL))
 369         return 0;
 370
 371     if (dmp1 != NULL) {
 372         BN_clear_free(r->dmp1);
 373         r->dmp1 = dmp1;
 374         BN_set_flags(r->dmp1, BN_FLG_CONSTTIME);
 375     }
 376     if (dmq1 != NULL) {
 377         BN_clear_free(r->dmq1);
 378         r->dmq1 = dmq1;
 379         BN_set_flags(r->dmq1, BN_FLG_CONSTTIME);
 380     }
 381     if (iqmp != NULL) {
 382         BN_clear_free(r->iqmp);
 383         r->iqmp = iqmp;
 384         BN_set_flags(r->iqmp, BN_FLG_CONSTTIME);
 385     }
 386     r->dirty_cnt++;
 387
 388     return 1;
 389 }
 390
 391 /*
 392  * Is it better to export RSA_PRIME_INFO structure
 393  * and related functions to let user pass a triplet?
 394  */
 395 int RSA_set0_multi_prime_params(RSA *r, BIGNUM *primes[], BIGNUM *exps[],
 396                                 BIGNUM *coeffs[], int pnum)
 397 {
 398     STACK_OF(RSA_PRIME_INFO) *prime_infos, *old = NULL;
 399     RSA_PRIME_INFO *pinfo;
 400     int i;
 401
 402     if (primes == NULL || exps == NULL || coeffs == NULL || pnum == 0)
 403         return 0;
 404
 405     prime_infos = sk_RSA_PRIME_INFO_new_reserve(NULL, pnum);
 406     if (prime_infos == NULL)
 407         return 0;
 408
 409     if (r->prime_infos != NULL)
 410         old = r->prime_infos;
 411
 412     for (i = 0; i < pnum; i++) {
 413         pinfo = rsa_multip_info_new();
 414         if (pinfo == NULL)
 415             goto err;
 416         if (primes[i] != NULL && exps[i] != NULL && coeffs[i] != NULL) {
 417             BN_clear_free(pinfo->r);
 418             BN_clear_free(pinfo->d);
 419             BN_clear_free(pinfo->t);
 420             pinfo->r = primes[i];
 421             pinfo->d = exps[i];
 422             pinfo->t = coeffs[i];
 423             BN_set_flags(pinfo->r, BN_FLG_CONSTTIME);
 424             BN_set_flags(pinfo->d, BN_FLG_CONSTTIME);
 425             BN_set_flags(pinfo->t, BN_FLG_CONSTTIME);
 426         } else {
 427             rsa_multip_info_free(pinfo);
 428             goto err;
 429         }
 430         (void)sk_RSA_PRIME_INFO_push(prime_infos, pinfo);
 431     }
 432
 433     r->prime_infos = prime_infos;
 434
 435     if (!rsa_multip_calc_product(r)) {
 436         r->prime_infos = old;
 437         goto err;
 438     }
 439
 440     if (old != NULL) {
 441         /*
 442          * This is hard to deal with, since the old infos could
 443          * also be set by this function and r, d, t should not
 444          * be freed in that case. So currently, stay consistent
 445          * with other *set0* functions: just free it...
 446          */
 447         sk_RSA_PRIME_INFO_pop_free(old, rsa_multip_info_free);
 448     }
 449
 450     r->version = RSA_ASN1_VERSION_MULTI;
 451     r->dirty_cnt++;
 452
 453     return 1;
 454  err:
 455     /* r, d, t should not be freed */
 456     sk_RSA_PRIME_INFO_pop_free(prime_infos, rsa_multip_info_free_ex);
 457     return 0;
 458 }
 459
 460 void RSA_get0_key(const RSA *r,
 461                   const BIGNUM **n, const BIGNUM **e, const BIGNUM **d)
 462 {
 463     if (n != NULL)
 464         *n = r->n;
 465     if (e != NULL)
 466         *e = r->e;
 467     if (d != NULL)
 468         *d = r->d;
 469 }
 470
 471 void RSA_get0_factors(const RSA *r, const BIGNUM **p, const BIGNUM **q)
 472 {
 473     if (p != NULL)
 474         *p = r->p;
 475     if (q != NULL)
 476         *q = r->q;
 477 }
 478
 479 int RSA_get_multi_prime_extra_count(const RSA *r)
 480 {
 481     int pnum;
 482
 483     pnum = sk_RSA_PRIME_INFO_num(r->prime_infos);
 484     if (pnum <= 0)
 485         pnum = 0;
 486     return pnum;
 487 }
 488
 489 int RSA_get0_multi_prime_factors(const RSA *r, const BIGNUM *primes[])
 490 {
 491     int pnum, i;
 492     RSA_PRIME_INFO *pinfo;
 493
 494     if ((pnum = RSA_get_multi_prime_extra_count(r)) == 0)
 495         return 0;
 496
 497     /*
 498      * return other primes
 499      * it's caller's responsibility to allocate oth_primes[pnum]
 500      */
 501     for (i = 0; i < pnum; i++) {
 502         pinfo = sk_RSA_PRIME_INFO_value(r->prime_infos, i);
 503         primes[i] = pinfo->r;
 504     }
 505
 506     return 1;
 507 }
 508
 509 void RSA_get0_crt_params(const RSA *r,
 510                          const BIGNUM **dmp1, const BIGNUM **dmq1,
 511                          const BIGNUM **iqmp)
 512 {
 513     if (dmp1 != NULL)
 514         *dmp1 = r->dmp1;
 515     if (dmq1 != NULL)
 516         *dmq1 = r->dmq1;
 517     if (iqmp != NULL)
 518         *iqmp = r->iqmp;
 519 }
 520
 521 int RSA_get0_multi_prime_crt_params(const RSA *r, const BIGNUM *exps[],
 522                                     const BIGNUM *coeffs[])
 523 {
 524     int pnum;
 525
 526     if ((pnum = RSA_get_multi_prime_extra_count(r)) == 0)
 527         return 0;
 528
 529     /* return other primes */
 530     if (exps != NULL || coeffs != NULL) {
 531         RSA_PRIME_INFO *pinfo;
 532         int i;
 533
 534         /* it's the user's job to guarantee the buffer length */
 535         for (i = 0; i < pnum; i++) {
 536             pinfo = sk_RSA_PRIME_INFO_value(r->prime_infos, i);
 537             if (exps != NULL)
 538                 exps[i] = pinfo->d;
 539             if (coeffs != NULL)
 540                 coeffs[i] = pinfo->t;
 541         }
 542     }
 543
 544     return 1;
 545 }
 546
 547 const BIGNUM *RSA_get0_n(const RSA *r)
 548 {
 549     return r->n;
 550 }
 551
 552 const BIGNUM *RSA_get0_e(const RSA *r)
 553 {
 554     return r->e;
 555 }
 556
 557 const BIGNUM *RSA_get0_d(const RSA *r)
 558 {
 559     return r->d;
 560 }
 561
 562 const BIGNUM *RSA_get0_p(const RSA *r)
 563 {
 564     return r->p;
 565 }
 566
 567 const BIGNUM *RSA_get0_q(const RSA *r)
 568 {
 569     return r->q;
 570 }
 571
 572 const BIGNUM *RSA_get0_dmp1(const RSA *r)
 573 {
 574     return r->dmp1;
 575 }
 576
 577 const BIGNUM *RSA_get0_dmq1(const RSA *r)
 578 {
 579     return r->dmq1;
 580 }
 581
 582 const BIGNUM *RSA_get0_iqmp(const RSA *r)
 583 {
 584     return r->iqmp;
 585 }
 586
 587 const RSA_PSS_PARAMS *RSA_get0_pss_params(const RSA *r)
 588 {
 589     return r->pss;
 590 }
 591
 592 void RSA_clear_flags(RSA *r, int flags)
 593 {
 594     r->flags &= ~flags;
 595 }
 596
 597 int RSA_test_flags(const RSA *r, int flags)
 598 {
 599     return r->flags & flags;
 600 }
 601
 602 void RSA_set_flags(RSA *r, int flags)
 603 {
 604     r->flags |= flags;
 605 }
 606
 607 int RSA_get_version(RSA *r)
 608 {
 609     /* { two-prime(0), multi(1) } */
 610     return r->version;
 611 }
 612
 613 ENGINE *RSA_get0_engine(const RSA *r)
 614 {
 615     return r->engine;
 616 }
 617
 618 int RSA_pkey_ctx_ctrl(EVP_PKEY_CTX *ctx, int optype, int cmd, int p1, void *p2)
 619 {
 620     /* If key type not RSA or RSA-PSS return error */
 621     if (ctx != NULL && ctx->pmeth != NULL
 622         && ctx->pmeth->pkey_id != EVP_PKEY_RSA
 623         && ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
 624         return -1;
 625      return EVP_PKEY_CTX_ctrl(ctx, -1, optype, cmd, p1, p2);
 626 }
 627
 628 DEFINE_STACK_OF(BIGNUM)
 629
 630 int rsa_set0_all_params(RSA *r, const STACK_OF(BIGNUM) *primes,
 631                         const STACK_OF(BIGNUM) *exps,
 632                         const STACK_OF(BIGNUM) *coeffs)
 633 {
 634     STACK_OF(RSA_PRIME_INFO) *prime_infos, *old_infos = NULL;
 635     int pnum;
 636
 637     if (primes == NULL || exps == NULL || coeffs == NULL)
 638         return 0;
 639
 640     pnum = sk_BIGNUM_num(primes);
 641     if (pnum < 2
 642         || pnum != sk_BIGNUM_num(exps)
 643         || pnum != sk_BIGNUM_num(coeffs) + 1)
 644         return 0;
 645
 646     if (!RSA_set0_factors(r, sk_BIGNUM_value(primes, 0),
 647                           sk_BIGNUM_value(primes, 1))
 648         || !RSA_set0_crt_params(r, sk_BIGNUM_value(exps, 0),
 649                                 sk_BIGNUM_value(exps, 1),
 650                                 sk_BIGNUM_value(coeffs, 0)))
 651         return 0;
 652
 653     old_infos = r->prime_infos;
 654
 655     if (pnum > 2) {
 656         int i;
 657
 658         prime_infos = sk_RSA_PRIME_INFO_new_reserve(NULL, pnum);
 659         if (prime_infos == NULL)
 660             return 0;
 661
 662         for (i = 2; i < pnum; i++) {
 663             BIGNUM *prime = sk_BIGNUM_value(primes, i);
 664             BIGNUM *exp = sk_BIGNUM_value(exps, i);
 665             BIGNUM *coeff = sk_BIGNUM_value(coeffs, i - 1);
 666             RSA_PRIME_INFO *pinfo = NULL;
 667
 668             if (!ossl_assert(prime != NULL && exp != NULL && coeff != NULL))
 669                 goto err;
 670
 671             /* Using rsa_multip_info_new() is wasteful, so allocate directly */
 672             if ((pinfo = OPENSSL_zalloc(sizeof(*pinfo))) == NULL) {
 673                 ERR_raise(ERR_LIB_RSA, ERR_R_MALLOC_FAILURE);
 674                 goto err;
 675             }
 676
 677             pinfo->r = prime;
 678             pinfo->d = exp;
 679             pinfo->t = coeff;
 680             BN_set_flags(pinfo->r, BN_FLG_CONSTTIME);
 681             BN_set_flags(pinfo->d, BN_FLG_CONSTTIME);
 682             BN_set_flags(pinfo->t, BN_FLG_CONSTTIME);
 683             (void)sk_RSA_PRIME_INFO_push(prime_infos, pinfo);
 684         }
 685
 686         r->prime_infos = prime_infos;
 687
 688         if (!rsa_multip_calc_product(r)) {
 689             r->prime_infos = old_infos;
 690             goto err;
 691         }
 692     }
 693
 694     if (old_infos != NULL) {
 695         /*
 696          * This is hard to deal with, since the old infos could
 697          * also be set by this function and r, d, t should not
 698          * be freed in that case. So currently, stay consistent
 699          * with other *set0* functions: just free it...
 700          */
 701         sk_RSA_PRIME_INFO_pop_free(old_infos, rsa_multip_info_free);
 702     }
 703
 704     r->version = pnum > 2 ? RSA_ASN1_VERSION_MULTI : RSA_ASN1_VERSION_DEFAULT;
 705     r->dirty_cnt++;
 706
 707     return 1;
 708  err:
 709     /* r, d, t should not be freed */
 710     sk_RSA_PRIME_INFO_pop_free(prime_infos, rsa_multip_info_free_ex);
 711     return 0;
 712 }
 713
 714 DEFINE_SPECIAL_STACK_OF_CONST(BIGNUM_const, BIGNUM)
 715
 716 int rsa_get0_all_params(RSA *r, STACK_OF(BIGNUM_const) *primes,
 717                         STACK_OF(BIGNUM_const) *exps,
 718                         STACK_OF(BIGNUM_const) *coeffs)
 719 {
 720     RSA_PRIME_INFO *pinfo;
 721     int i, pnum;
 722
 723     if (r == NULL)
 724         return 0;
 725
 726     pnum = RSA_get_multi_prime_extra_count(r);
 727
 728     sk_BIGNUM_const_push(primes, RSA_get0_p(r));
 729     sk_BIGNUM_const_push(primes, RSA_get0_q(r));
 730     sk_BIGNUM_const_push(exps, RSA_get0_dmp1(r));
 731     sk_BIGNUM_const_push(exps, RSA_get0_dmq1(r));
 732     sk_BIGNUM_const_push(coeffs, RSA_get0_iqmp(r));
 733     for (i = 0; i < pnum; i++) {
 734         pinfo = sk_RSA_PRIME_INFO_value(r->prime_infos, i);
 735         sk_BIGNUM_const_push(primes, pinfo->r);
 736         sk_BIGNUM_const_push(exps, pinfo->d);
 737         sk_BIGNUM_const_push(coeffs, pinfo->t);
 738     }
 739
 740     return 1;
 741 }
 742
 743 int EVP_PKEY_CTX_set_rsa_padding(EVP_PKEY_CTX *ctx, int pad_mode)
 744 {
 745     OSSL_PARAM pad_params[2], *p = pad_params;
 746
 747     if (ctx == NULL) {
 748         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 749         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 750         return -2;
 751     }
 752
 753     /* If key type not RSA or RSA-PSS return error */
 754     if (ctx->pmeth != NULL
 755             && ctx->pmeth->pkey_id != EVP_PKEY_RSA
 756             && ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
 757         return -1;
 758
 759     /* TODO(3.0): Remove this eventually when no more legacy */
 760     if (!EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
 761             || ctx->op.ciph.ciphprovctx == NULL)
 762         return EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_RSA_PADDING,
 763                                  pad_mode, NULL);
 764
 765     *p++ = OSSL_PARAM_construct_int(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, &pad_mode);
 766     *p++ = OSSL_PARAM_construct_end();
 767
 768     return EVP_PKEY_CTX_set_params(ctx, pad_params);
 769 }
 770
 771 int EVP_PKEY_CTX_get_rsa_padding(EVP_PKEY_CTX *ctx, int *pad_mode)
 772 {
 773     OSSL_PARAM pad_params[2], *p = pad_params;
 774
 775     if (ctx == NULL || pad_mode == NULL) {
 776         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 777         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 778         return -2;
 779     }
 780
 781     /* If key type not RSA or RSA-PSS return error */
 782     if (ctx->pmeth != NULL
 783             && ctx->pmeth->pkey_id != EVP_PKEY_RSA
 784             && ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
 785         return -1;
 786
 787     /* TODO(3.0): Remove this eventually when no more legacy */
 788     if (!EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
 789             || ctx->op.ciph.ciphprovctx == NULL)
 790         return EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_GET_RSA_PADDING, 0,
 791                                  pad_mode);
 792
 793     *p++ = OSSL_PARAM_construct_int(OSSL_ASYM_CIPHER_PARAM_PAD_MODE, pad_mode);
 794     *p++ = OSSL_PARAM_construct_end();
 795
 796     if (!EVP_PKEY_CTX_get_params(ctx, pad_params))
 797         return 0;
 798
 799     return 1;
 800
 801 }
 802
 803 int EVP_PKEY_CTX_set_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
 804 {
 805     const char *name;
 806
 807     if (ctx == NULL || !EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)) {
 808         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 809         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 810         return -2;
 811     }
 812
 813     /* If key type not RSA return error */
 814     if (ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_RSA)
 815         return -1;
 816
 817     /* TODO(3.0): Remove this eventually when no more legacy */
 818     if (ctx->op.ciph.ciphprovctx == NULL)
 819         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
 820                                  EVP_PKEY_CTRL_RSA_OAEP_MD, 0, (void *)md);
 821
 822     name = (md == NULL) ? "" : EVP_MD_name(md);
 823
 824     return EVP_PKEY_CTX_set_rsa_oaep_md_name(ctx, name, NULL);
 825 }
 826
 827 int EVP_PKEY_CTX_set_rsa_oaep_md_name(EVP_PKEY_CTX *ctx, const char *mdname,
 828                                       const char *mdprops)
 829 {
 830     OSSL_PARAM rsa_params[3], *p = rsa_params;
 831
 832     if (ctx == NULL || !EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)) {
 833         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 834         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 835         return -2;
 836     }
 837
 838     /* If key type not RSA return error */
 839     if (ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_RSA)
 840         return -1;
 841
 842
 843     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST,
 844                                             /*
 845                                              * Cast away the const. This is read
 846                                              * only so should be safe
 847                                              */
 848                                             (char *)mdname,
 849                                             strlen(mdname) + 1);
 850     if (mdprops != NULL) {
 851         *p++ = OSSL_PARAM_construct_utf8_string(
 852                     OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST_PROPS,
 853                     /*
 854                      * Cast away the const. This is read
 855                      * only so should be safe
 856                      */
 857                     (char *)mdprops,
 858                     strlen(mdprops) + 1);
 859     }
 860     *p++ = OSSL_PARAM_construct_end();
 861
 862     return EVP_PKEY_CTX_set_params(ctx, rsa_params);
 863 }
 864
 865 int EVP_PKEY_CTX_get_rsa_oaep_md_name(EVP_PKEY_CTX *ctx, char *name,
 866                                       size_t namelen)
 867 {
 868     OSSL_PARAM rsa_params[2], *p = rsa_params;
 869
 870     if (ctx == NULL || !EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)) {
 871         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 872         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 873         return -2;
 874     }
 875
 876     /* If key type not RSA return error */
 877     if (ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_RSA)
 878         return -1;
 879
 880     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ASYM_CIPHER_PARAM_OAEP_DIGEST,
 881                                             name, namelen);
 882     *p++ = OSSL_PARAM_construct_end();
 883
 884     if (!EVP_PKEY_CTX_get_params(ctx, rsa_params))
 885         return -1;
 886
 887     return 1;
 888 }
 889
 890 int EVP_PKEY_CTX_get_rsa_oaep_md(EVP_PKEY_CTX *ctx, const EVP_MD **md)
 891 {
 892     /* 80 should be big enough */
 893     char name[80] = "";
 894
 895     if (ctx == NULL || md == NULL || !EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)) {
 896         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 897         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 898         return -2;
 899     }
 900
 901     /* If key type not RSA return error */
 902     if (ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_RSA)
 903         return -1;
 904
 905     /* TODO(3.0): Remove this eventually when no more legacy */
 906     if (ctx->op.ciph.ciphprovctx == NULL)
 907         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
 908                                  EVP_PKEY_CTRL_GET_RSA_OAEP_MD, 0, (void *)md);
 909
 910     if (EVP_PKEY_CTX_get_rsa_oaep_md_name(ctx, name, sizeof(name)) <= 0)
 911         return -1;
 912
 913     /* May be NULL meaning "unknown" */
 914     *md = EVP_get_digestbyname(name);
 915
 916     return 1;
 917 }
 918
 919 int EVP_PKEY_CTX_set_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
 920 {
 921     const char *name;
 922
 923     if (ctx == NULL
 924             || (!EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
 925                 && !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx))) {
 926         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 927         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 928         return -2;
 929     }
 930
 931     /* If key type not RSA return error */
 932     if (ctx->pmeth != NULL
 933             && ctx->pmeth->pkey_id != EVP_PKEY_RSA
 934             && ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
 935         return -1;
 936
 937     /* TODO(3.0): Remove this eventually when no more legacy */
 938     if ((EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
 939                 && ctx->op.ciph.ciphprovctx == NULL)
 940             || (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
 941                 && ctx->op.sig.sigprovctx == NULL))
 942         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA,
 943                                  EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
 944                                  EVP_PKEY_CTRL_RSA_MGF1_MD, 0, (void *)md);
 945
 946     name = (md == NULL) ? "" : EVP_MD_name(md);
 947
 948     return EVP_PKEY_CTX_set_rsa_mgf1_md_name(ctx, name, NULL);
 949 }
 950
 951 int EVP_PKEY_CTX_set_rsa_mgf1_md_name(EVP_PKEY_CTX *ctx, const char *mdname,
 952                                       const char *mdprops)
 953 {
 954     OSSL_PARAM rsa_params[3], *p = rsa_params;
 955
 956     if (ctx == NULL
 957             || mdname == NULL
 958             || (!EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
 959                 && !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx))) {
 960         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
 961         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
 962         return -2;
 963     }
 964
 965     /* If key type not RSA return error */
 966     if (ctx->pmeth != NULL
 967             && ctx->pmeth->pkey_id != EVP_PKEY_RSA
 968             && ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
 969         return -1;
 970
 971     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST,
 972                                             /*
 973                                              * Cast away the const. This is read
 974                                              * only so should be safe
 975                                              */
 976                                             (char *)mdname,
 977                                             strlen(mdname) + 1);
 978     if (mdprops != NULL) {
 979         *p++ = OSSL_PARAM_construct_utf8_string(
 980                     OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST_PROPS,
 981                     /*
 982                      * Cast away the const. This is read
 983                      * only so should be safe
 984                      */
 985                     (char *)mdprops,
 986                     strlen(mdprops) + 1);
 987     }
 988     *p++ = OSSL_PARAM_construct_end();
 989
 990     return EVP_PKEY_CTX_set_params(ctx, rsa_params);
 991 }
 992
 993 int EVP_PKEY_CTX_get_rsa_mgf1_md_name(EVP_PKEY_CTX *ctx, char *name,
 994                                       size_t namelen)
 995 {
 996     OSSL_PARAM rsa_params[2], *p = rsa_params;
 997
 998     if (ctx == NULL
 999             || (!EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
1000                 && !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx))) {
1001         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
1002         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
1003         return -2;
1004     }
1005
1006     /* If key type not RSA or RSA-PSS return error */
1007     if (ctx->pmeth != NULL
1008             && ctx->pmeth->pkey_id != EVP_PKEY_RSA
1009             && ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
1010         return -1;
1011
1012     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_ASYM_CIPHER_PARAM_MGF1_DIGEST,
1013                                             name, namelen);
1014     *p++ = OSSL_PARAM_construct_end();
1015
1016     if (!EVP_PKEY_CTX_get_params(ctx, rsa_params))
1017         return -1;
1018
1019     return 1;
1020 }
1021
1022 int EVP_PKEY_CTX_get_rsa_mgf1_md(EVP_PKEY_CTX *ctx, const EVP_MD **md)
1023 {
1024     /* 80 should be big enough */
1025     char name[80] = "";
1026
1027     if (ctx == NULL
1028             || (!EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
1029                 && !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx))) {
1030         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
1031         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
1032         return -2;
1033     }
1034
1035     /* If key type not RSA or RSA-PSS return error */
1036     if (ctx->pmeth != NULL
1037             && ctx->pmeth->pkey_id != EVP_PKEY_RSA
1038             && ctx->pmeth->pkey_id != EVP_PKEY_RSA_PSS)
1039         return -1;
1040
1041     /* TODO(3.0): Remove this eventually when no more legacy */
1042     if ((EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)
1043                 && ctx->op.ciph.ciphprovctx == NULL)
1044             || (EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)
1045                 && ctx->op.sig.sigprovctx == NULL))
1046         return EVP_PKEY_CTX_ctrl(ctx, -1,
1047                                  EVP_PKEY_OP_TYPE_SIG | EVP_PKEY_OP_TYPE_CRYPT,
1048                                  EVP_PKEY_CTRL_GET_RSA_MGF1_MD, 0, (void *)md);
1049
1050     if (EVP_PKEY_CTX_get_rsa_mgf1_md_name(ctx, name, sizeof(name)) <= 0)
1051         return -1;
1052
1053     /* May be NULL meaning "unknown" */
1054     *md = EVP_get_digestbyname(name);
1055
1056     return 1;
1057 }
1058
1059 int EVP_PKEY_CTX_set0_rsa_oaep_label(EVP_PKEY_CTX *ctx, void *label, int llen)
1060 {
1061     OSSL_PARAM rsa_params[2], *p = rsa_params;
1062
1063     if (ctx == NULL || !EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)) {
1064         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
1065         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
1066         return -2;
1067     }
1068
1069     /* If key type not RSA return error */
1070     if (ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_RSA)
1071         return -1;
1072
1073     /* TODO(3.0): Remove this eventually when no more legacy */
1074     if (ctx->op.ciph.ciphprovctx == NULL)
1075         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
1076                                  EVP_PKEY_CTRL_RSA_OAEP_LABEL, llen,
1077                                  (void *)label);
1078
1079     *p++ = OSSL_PARAM_construct_octet_string(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL,
1080                                             /*
1081                                              * Cast away the const. This is read
1082                                              * only so should be safe
1083                                              */
1084                                             (void *)label,
1085                                             (size_t)llen);
1086     *p++ = OSSL_PARAM_construct_end();
1087
1088     if (!EVP_PKEY_CTX_set_params(ctx, rsa_params))
1089         return 0;
1090
1091     OPENSSL_free(label);
1092     return 1;
1093 }
1094
1095 int EVP_PKEY_CTX_get0_rsa_oaep_label(EVP_PKEY_CTX *ctx, unsigned char **label)
1096 {
1097     OSSL_PARAM rsa_params[3], *p = rsa_params;
1098     size_t labellen;
1099
1100     if (ctx == NULL || !EVP_PKEY_CTX_IS_ASYM_CIPHER_OP(ctx)) {
1101         ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
1102         /* Uses the same return values as EVP_PKEY_CTX_ctrl */
1103         return -2;
1104     }
1105
1106     /* If key type not RSA return error */
1107     if (ctx->pmeth != NULL && ctx->pmeth->pkey_id != EVP_PKEY_RSA)
1108         return -1;
1109
1110     /* TODO(3.0): Remove this eventually when no more legacy */
1111     if (ctx->op.ciph.ciphprovctx == NULL)
1112         return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_RSA, EVP_PKEY_OP_TYPE_CRYPT,
1113                                  EVP_PKEY_CTRL_GET_RSA_OAEP_LABEL, 0,
1114                                  (void *)label);
1115
1116     *p++ = OSSL_PARAM_construct_octet_ptr(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL,
1117                                           (void **)label, 0);
1118     *p++ = OSSL_PARAM_construct_size_t(OSSL_ASYM_CIPHER_PARAM_OAEP_LABEL_LEN,
1119                                        &labellen);
1120     *p++ = OSSL_PARAM_construct_end();
1121
1122     if (!EVP_PKEY_CTX_get_params(ctx, rsa_params))
1123         return -1;
1124
1125     if (labellen > INT_MAX)
1126         return -1;
1127
1128     return (int)labellen;
1129 }