lib/libcrypto/rsa/rsa_lib.c

   1 /* $OpenBSD: rsa_lib.c,v 1.31 2017/01/29 17:49:23 beck Exp $ */
   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
  61 #include <openssl/opensslconf.h>
  62
  63 #include <openssl/bn.h>
  64 #include <openssl/crypto.h>
  65 #include <openssl/err.h>
  66 #include <openssl/lhash.h>
  67 #include <openssl/rsa.h>
  68
  69 #ifndef OPENSSL_NO_ENGINE
  70 #include <openssl/engine.h>
  71 #endif
  72
  73 static const RSA_METHOD *default_RSA_meth = NULL;
  74
  75 RSA *
  76 RSA_new(void)
  77 {
  78         RSA *r = RSA_new_method(NULL);
  79
  80         return r;
  81 }
  82
  83 void
  84 RSA_set_default_method(const RSA_METHOD *meth)
  85 {
  86         default_RSA_meth = meth;
  87 }
  88
  89 const RSA_METHOD *
  90 RSA_get_default_method(void)
  91 {
  92         if (default_RSA_meth == NULL)
  93                 default_RSA_meth = RSA_PKCS1_SSLeay();
  94
  95         return default_RSA_meth;
  96 }
  97
  98 const RSA_METHOD *
  99 RSA_get_method(const RSA *rsa)
 100 {
 101         return rsa->meth;
 102 }
 103
 104 int
 105 RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
 106 {
 107         /*
 108          * NB: The caller is specifically setting a method, so it's not up to us
 109          * to deal with which ENGINE it comes from.
 110          */
 111         const RSA_METHOD *mtmp;
 112
 113         mtmp = rsa->meth;
 114         if (mtmp->finish)
 115                 mtmp->finish(rsa);
 116 #ifndef OPENSSL_NO_ENGINE
 117         if (rsa->engine) {
 118                 ENGINE_finish(rsa->engine);
 119                 rsa->engine = NULL;
 120         }
 121 #endif
 122         rsa->meth = meth;
 123         if (meth->init)
 124                 meth->init(rsa);
 125         return 1;
 126 }
 127
 128 RSA *
 129 RSA_new_method(ENGINE *engine)
 130 {
 131         RSA *ret;
 132
 133         ret = malloc(sizeof(RSA));
 134         if (ret == NULL) {
 135                 RSAerror(ERR_R_MALLOC_FAILURE);
 136                 return NULL;
 137         }
 138
 139         ret->meth = RSA_get_default_method();
 140 #ifndef OPENSSL_NO_ENGINE
 141         if (engine) {
 142                 if (!ENGINE_init(engine)) {
 143                         RSAerror(ERR_R_ENGINE_LIB);
 144                         free(ret);
 145                         return NULL;
 146                 }
 147                 ret->engine = engine;
 148         } else
 149                 ret->engine = ENGINE_get_default_RSA();
 150         if (ret->engine) {
 151                 ret->meth = ENGINE_get_RSA(ret->engine);
 152                 if (!ret->meth) {
 153                         RSAerror(ERR_R_ENGINE_LIB);
 154                         ENGINE_finish(ret->engine);
 155                         free(ret);
 156                         return NULL;
 157                 }
 158         }
 159 #endif
 160
 161         ret->pad = 0;
 162         ret->version = 0;
 163         ret->n = NULL;
 164         ret->e = NULL;
 165         ret->d = NULL;
 166         ret->p = NULL;
 167         ret->q = NULL;
 168         ret->dmp1 = NULL;
 169         ret->dmq1 = NULL;
 170         ret->iqmp = NULL;
 171         ret->references = 1;
 172         ret->_method_mod_n = NULL;
 173         ret->_method_mod_p = NULL;
 174         ret->_method_mod_q = NULL;
 175         ret->blinding = NULL;
 176         ret->mt_blinding = NULL;
 177         ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
 178         if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
 179 #ifndef OPENSSL_NO_ENGINE
 180                 if (ret->engine)
 181                         ENGINE_finish(ret->engine);
 182 #endif
 183                 free(ret);
 184                 return NULL;
 185         }
 186
 187         if (ret->meth->init != NULL && !ret->meth->init(ret)) {
 188 #ifndef OPENSSL_NO_ENGINE
 189                 if (ret->engine)
 190                         ENGINE_finish(ret->engine);
 191 #endif
 192                 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
 193                 free(ret);
 194                 ret = NULL;
 195         }
 196         return ret;
 197 }
 198
 199 void
 200 RSA_free(RSA *r)
 201 {
 202         int i;
 203
 204         if (r == NULL)
 205                 return;
 206
 207         i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_RSA);
 208         if (i > 0)
 209                 return;
 210
 211         if (r->meth->finish)
 212                 r->meth->finish(r);
 213 #ifndef OPENSSL_NO_ENGINE
 214         if (r->engine)
 215                 ENGINE_finish(r->engine);
 216 #endif
 217
 218         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
 219
 220         BN_clear_free(r->n);
 221         BN_clear_free(r->e);
 222         BN_clear_free(r->d);
 223         BN_clear_free(r->p);
 224         BN_clear_free(r->q);
 225         BN_clear_free(r->dmp1);
 226         BN_clear_free(r->dmq1);
 227         BN_clear_free(r->iqmp);
 228         BN_BLINDING_free(r->blinding);
 229         BN_BLINDING_free(r->mt_blinding);
 230         free(r);
 231 }
 232
 233 int
 234 RSA_up_ref(RSA *r)
 235 {
 236         int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
 237         return i > 1 ? 1 : 0;
 238 }
 239
 240 int
 241 RSA_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 242     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 243 {
 244         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_RSA, argl, argp,
 245             new_func, dup_func, free_func);
 246 }
 247
 248 int
 249 RSA_set_ex_data(RSA *r, int idx, void *arg)
 250 {
 251         return CRYPTO_set_ex_data(&r->ex_data, idx, arg);
 252 }
 253
 254 void *
 255 RSA_get_ex_data(const RSA *r, int idx)
 256 {
 257         return CRYPTO_get_ex_data(&r->ex_data, idx);
 258 }