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_OpenSSL();
  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_zalloc(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->references = 1;
 157     ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
 158     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
 159 #ifndef OPENSSL_NO_ENGINE
 160         if (ret->engine)
 161             ENGINE_finish(ret->engine);
 162 #endif
 163         OPENSSL_free(ret);
 164         return (NULL);
 165     }
 166
 167     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 168 #ifndef OPENSSL_NO_ENGINE
 169         if (ret->engine)
 170             ENGINE_finish(ret->engine);
 171 #endif
 172         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
 173         OPENSSL_free(ret);
 174         ret = NULL;
 175     }
 176     return (ret);
 177 }
 178
 179 void RSA_free(RSA *r)
 180 {
 181     int i;
 182
 183     if (r == NULL)
 184         return;
 185
 186     i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_RSA);
 187 #ifdef REF_PRINT
 188     REF_PRINT("RSA", r);
 189 #endif
 190     if (i > 0)
 191         return;
 192 #ifdef REF_CHECK
 193     if (i < 0) {
 194         fprintf(stderr, "RSA_free, bad reference count\n");
 195         abort();
 196     }
 197 #endif
 198
 199     if (r->meth->finish)
 200         r->meth->finish(r);
 201 #ifndef OPENSSL_NO_ENGINE
 202     if (r->engine)
 203         ENGINE_finish(r->engine);
 204 #endif
 205
 206     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
 207
 208     BN_clear_free(r->n);
 209     BN_clear_free(r->e);
 210     BN_clear_free(r->d);
 211     BN_clear_free(r->p);
 212     BN_clear_free(r->q);
 213     BN_clear_free(r->dmp1);
 214     BN_clear_free(r->dmq1);
 215     BN_clear_free(r->iqmp);
 216     BN_BLINDING_free(r->blinding);
 217     BN_BLINDING_free(r->mt_blinding);
 218     OPENSSL_free(r->bignum_data);
 219     OPENSSL_free(r);
 220 }
 221
 222 int RSA_up_ref(RSA *r)
 223 {
 224     int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
 225 #ifdef REF_PRINT
 226     REF_PRINT("RSA", r);
 227 #endif
 228 #ifdef REF_CHECK
 229     if (i < 2) {
 230         fprintf(stderr, "RSA_up_ref, bad reference count\n");
 231         abort();
 232     }
 233 #endif
 234     return ((i > 1) ? 1 : 0);
 235 }
 236
 237 int RSA_set_ex_data(RSA *r, int idx, void *arg)
 238 {
 239     return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
 240 }
 241
 242 void *RSA_get_ex_data(const RSA *r, int idx)
 243 {
 244     return (CRYPTO_get_ex_data(&r->ex_data, idx));
 245 }
 246
 247 int RSA_memory_lock(RSA *r)
 248 {
 249     int i, j, k, off;
 250     char *p;
 251     BIGNUM *bn, **t[6], *b;
 252     BN_ULONG *ul;
 253
 254     if (r->d == NULL)
 255         return (1);
 256     t[0] = &r->d;
 257     t[1] = &r->p;
 258     t[2] = &r->q;
 259     t[3] = &r->dmp1;
 260     t[4] = &r->dmq1;
 261     t[5] = &r->iqmp;
 262     k = bn_sizeof_BIGNUM() * 6;
 263     off = k / sizeof(BN_ULONG) + 1;
 264     j = 1;
 265     for (i = 0; i < 6; i++)
 266         j += bn_get_top(*t[i]);
 267     if ((p = OPENSSL_malloc((off + j) * sizeof(*p))) == NULL) {
 268         RSAerr(RSA_F_RSA_MEMORY_LOCK, ERR_R_MALLOC_FAILURE);
 269         return (0);
 270     }
 271     memset(p, 0, sizeof(*p) * (off + j));
 272     bn = (BIGNUM *)p;
 273     ul = (BN_ULONG *)&(p[off]);
 274     for (i = 0; i < 6; i++) {
 275         b = *(t[i]);
 276         *(t[i]) = bn_array_el(bn, i);
 277         memcpy(bn_array_el(bn, i), b, bn_sizeof_BIGNUM());
 278         memcpy(ul, bn_get_words(b), sizeof(*ul) * bn_get_top(b));
 279         bn_set_static_words(bn_array_el(bn, i), ul, bn_get_top(b));
 280         ul += bn_get_top(b);
 281         BN_clear_free(b);
 282     }
 283
 284     /* I should fix this so it can still be done */
 285     r->flags &= ~(RSA_FLAG_CACHE_PRIVATE | RSA_FLAG_CACHE_PUBLIC);
 286
 287     r->bignum_data = p;
 288     return (1);
 289 }
 290
 291 int RSA_security_bits(const RSA *rsa)
 292 {
 293     return BN_security_bits(BN_num_bits(rsa->n), -1);
 294 }