crypto/rsa/rsa_lib.c

   1 /* crypto/rsa/rsa_lib.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58
  59 #include <stdio.h>
  60 #include <openssl/crypto.h>
  61 #include "internal/cryptlib.h"
  62 #include <openssl/lhash.h>
  63 #include "internal/bn_int.h"
  64 #include <openssl/rsa.h>
  65 #include <openssl/rand.h>
  66 #ifndef OPENSSL_NO_ENGINE
  67 # include <openssl/engine.h>
  68 #endif
  69
  70 static const RSA_METHOD *default_RSA_meth = NULL;
  71
  72 RSA *RSA_new(void)
  73 {
  74     RSA *r = RSA_new_method(NULL);
  75
  76     return r;
  77 }
  78
  79 void RSA_set_default_method(const RSA_METHOD *meth)
  80 {
  81     default_RSA_meth = meth;
  82 }
  83
  84 const RSA_METHOD *RSA_get_default_method(void)
  85 {
  86     if (default_RSA_meth == NULL) {
  87 #ifdef RSA_NULL
  88         default_RSA_meth = RSA_null_method();
  89 #else
  90         default_RSA_meth = RSA_PKCS1_SSLeay();
  91 #endif
  92     }
  93
  94     return default_RSA_meth;
  95 }
  96
  97 const RSA_METHOD *RSA_get_method(const RSA *rsa)
  98 {
  99     return rsa->meth;
 100 }
 101
 102 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
 103 {
 104     /*
 105      * NB: The caller is specifically setting a method, so it's not up to us
 106      * to deal with which ENGINE it comes from.
 107      */
 108     const RSA_METHOD *mtmp;
 109     mtmp = rsa->meth;
 110     if (mtmp->finish)
 111         mtmp->finish(rsa);
 112 #ifndef OPENSSL_NO_ENGINE
 113     if (rsa->engine) {
 114         ENGINE_finish(rsa->engine);
 115         rsa->engine = NULL;
 116     }
 117 #endif
 118     rsa->meth = meth;
 119     if (meth->init)
 120         meth->init(rsa);
 121     return 1;
 122 }
 123
 124 RSA *RSA_new_method(ENGINE *engine)
 125 {
 126     RSA *ret;
 127
 128     ret = OPENSSL_malloc(sizeof(*ret));
 129     if (ret == NULL) {
 130         RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 131         return NULL;
 132     }
 133
 134     ret->meth = RSA_get_default_method();
 135 #ifndef OPENSSL_NO_ENGINE
 136     if (engine) {
 137         if (!ENGINE_init(engine)) {
 138             RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 139             OPENSSL_free(ret);
 140             return NULL;
 141         }
 142         ret->engine = engine;
 143     } else
 144         ret->engine = ENGINE_get_default_RSA();
 145     if (ret->engine) {
 146         ret->meth = ENGINE_get_RSA(ret->engine);
 147         if (!ret->meth) {
 148             RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 149             ENGINE_finish(ret->engine);
 150             OPENSSL_free(ret);
 151             return NULL;
 152         }
 153     }
 154 #endif
 155
 156     ret->pad = 0;
 157     ret->version = 0;
 158     ret->n = NULL;
 159     ret->e = NULL;
 160     ret->d = NULL;
 161     ret->p = NULL;
 162     ret->q = NULL;
 163     ret->dmp1 = NULL;
 164     ret->dmq1 = NULL;
 165     ret->iqmp = NULL;
 166     ret->references = 1;
 167     ret->_method_mod_n = NULL;
 168     ret->_method_mod_p = NULL;
 169     ret->_method_mod_q = NULL;
 170     ret->blinding = NULL;
 171     ret->mt_blinding = NULL;
 172     ret->bignum_data = NULL;
 173     ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
 174     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
 175 #ifndef OPENSSL_NO_ENGINE
 176         if (ret->engine)
 177             ENGINE_finish(ret->engine);
 178 #endif
 179         OPENSSL_free(ret);
 180         return (NULL);
 181     }
 182
 183     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 184 #ifndef OPENSSL_NO_ENGINE
 185         if (ret->engine)
 186             ENGINE_finish(ret->engine);
 187 #endif
 188         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
 189         OPENSSL_free(ret);
 190         ret = NULL;
 191     }
 192     return (ret);
 193 }
 194
 195 void RSA_free(RSA *r)
 196 {
 197     int i;
 198
 199     if (r == NULL)
 200         return;
 201
 202     i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_RSA);
 203 #ifdef REF_PRINT
 204     REF_PRINT("RSA", r);
 205 #endif
 206     if (i > 0)
 207         return;
 208 #ifdef REF_CHECK
 209     if (i < 0) {
 210         fprintf(stderr, "RSA_free, bad reference count\n");
 211         abort();
 212     }
 213 #endif
 214
 215     if (r->meth->finish)
 216         r->meth->finish(r);
 217 #ifndef OPENSSL_NO_ENGINE
 218     if (r->engine)
 219         ENGINE_finish(r->engine);
 220 #endif
 221
 222     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
 223
 224     BN_clear_free(r->n);
 225     BN_clear_free(r->e);
 226     BN_clear_free(r->d);
 227     BN_clear_free(r->p);
 228     BN_clear_free(r->q);
 229     BN_clear_free(r->dmp1);
 230     BN_clear_free(r->dmq1);
 231     BN_clear_free(r->iqmp);
 232     BN_BLINDING_free(r->blinding);
 233     BN_BLINDING_free(r->mt_blinding);
 234     OPENSSL_free(r->bignum_data);
 235     OPENSSL_free(r);
 236 }
 237
 238 int RSA_up_ref(RSA *r)
 239 {
 240     int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
 241 #ifdef REF_PRINT
 242     REF_PRINT("RSA", r);
 243 #endif
 244 #ifdef REF_CHECK
 245     if (i < 2) {
 246         fprintf(stderr, "RSA_up_ref, bad reference count\n");
 247         abort();
 248     }
 249 #endif
 250     return ((i > 1) ? 1 : 0);
 251 }
 252
 253 int RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 254                          CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 255 {
 256     return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
 257                                    new_func, dup_func, free_func);
 258 }
 259
 260 int RSA_set_ex_data(RSA *r, int idx, void *arg)
 261 {
 262     return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
 263 }
 264
 265 void *RSA_get_ex_data(const RSA *r, int idx)
 266 {
 267     return (CRYPTO_get_ex_data(&r->ex_data, idx));
 268 }
 269
 270 int RSA_memory_lock(RSA *r)
 271 {
 272     int i, j, k, off;
 273     char *p;
 274     BIGNUM *bn, **t[6], *b;
 275     BN_ULONG *ul;
 276
 277     if (r->d == NULL)
 278         return (1);
 279     t[0] = &r->d;
 280     t[1] = &r->p;
 281     t[2] = &r->q;
 282     t[3] = &r->dmp1;
 283     t[4] = &r->dmq1;
 284     t[5] = &r->iqmp;
 285     k = bn_sizeof_BIGNUM() * 6;
 286     off = k / sizeof(BN_ULONG) + 1;
 287     j = 1;
 288     for (i = 0; i < 6; i++)
 289         j += bn_get_top(*t[i]);
 290     if ((p = OPENSSL_malloc((off + j) * sizeof(*p))) == NULL) {
 291         RSAerr(RSA_F_RSA_MEMORY_LOCK, ERR_R_MALLOC_FAILURE);
 292         return (0);
 293     }
 294     memset(p, 0, sizeof(*p) * (off + j));
 295     bn = (BIGNUM *)p;
 296     ul = (BN_ULONG *)&(p[off]);
 297     for (i = 0; i < 6; i++) {
 298         b = *(t[i]);
 299         *(t[i]) = bn_array_el(bn, i);
 300         memcpy(bn_array_el(bn, i), b, bn_sizeof_BIGNUM());
 301         memcpy(ul, bn_get_words(b), sizeof(*ul) * bn_get_top(b));
 302         bn_set_static_words(bn_array_el(bn, i), ul, bn_get_top(b));
 303         ul += bn_get_top(b);
 304         BN_clear_free(b);
 305     }
 306
 307     /* I should fix this so it can still be done */
 308     r->flags &= ~(RSA_FLAG_CACHE_PRIVATE | RSA_FLAG_CACHE_PUBLIC);
 309
 310     r->bignum_data = p;
 311     return (1);
 312 }
 313
 314 int RSA_security_bits(const RSA *rsa)
 315 {
 316     return BN_security_bits(BN_num_bits(rsa->n), -1);
 317 }