crypto/rsa/rsa_lib.c

   1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   2  * All rights reserved.
   3  *
   4  * This package is an SSL implementation written
   5  * by Eric Young (eay@cryptsoft.com).
   6  * The implementation was written so as to conform with Netscapes SSL.
   7  *
   8  * This library is free for commercial and non-commercial use as long as
   9  * the following conditions are aheared to.  The following conditions
  10  * apply to all code found in this distribution, be it the RC4, RSA,
  11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  12  * included with this distribution is covered by the same copyright terms
  13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  14  *
  15  * Copyright remains Eric Young's, and as such any Copyright notices in
  16  * the code are not to be removed.
  17  * If this package is used in a product, Eric Young should be given attribution
  18  * as the author of the parts of the library used.
  19  * This can be in the form of a textual message at program startup or
  20  * in documentation (online or textual) provided with the package.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *    "This product includes cryptographic software written by
  33  *     Eric Young (eay@cryptsoft.com)"
  34  *    The word 'cryptographic' can be left out if the rouines from the library
  35  *    being used are not cryptographic related :-).
  36  * 4. If you include any Windows specific code (or a derivative thereof) from
  37  *    the apps directory (application code) you must include an acknowledgement:
  38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  *
  52  * The licence and distribution terms for any publically available version or
  53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  54  * copied and put under another distribution licence
  55  * [including the GNU Public Licence.]
  56  */
  57
  58 #include <stdio.h>
  59 #include <openssl/crypto.h>
  60 #include "internal/cryptlib.h"
  61 #include <openssl/lhash.h>
  62 #include "internal/bn_int.h"
  63 #include <openssl/rsa.h>
  64 #include <openssl/rand.h>
  65 #ifndef OPENSSL_NO_ENGINE
  66 # include <openssl/engine.h>
  67 #endif
  68
  69 static const RSA_METHOD *default_RSA_meth = NULL;
  70
  71 RSA *RSA_new(void)
  72 {
  73     RSA *r = RSA_new_method(NULL);
  74
  75     return r;
  76 }
  77
  78 void RSA_set_default_method(const RSA_METHOD *meth)
  79 {
  80     default_RSA_meth = meth;
  81 }
  82
  83 const RSA_METHOD *RSA_get_default_method(void)
  84 {
  85     if (default_RSA_meth == NULL) {
  86 #ifdef RSA_NULL
  87         default_RSA_meth = RSA_null_method();
  88 #else
  89         default_RSA_meth = RSA_PKCS1_OpenSSL();
  90 #endif
  91     }
  92
  93     return default_RSA_meth;
  94 }
  95
  96 const RSA_METHOD *RSA_get_method(const RSA *rsa)
  97 {
  98     return rsa->meth;
  99 }
 100
 101 int RSA_set_method(RSA *rsa, const RSA_METHOD *meth)
 102 {
 103     /*
 104      * NB: The caller is specifically setting a method, so it's not up to us
 105      * to deal with which ENGINE it comes from.
 106      */
 107     const RSA_METHOD *mtmp;
 108     mtmp = rsa->meth;
 109     if (mtmp->finish)
 110         mtmp->finish(rsa);
 111 #ifndef OPENSSL_NO_ENGINE
 112     if (rsa->engine) {
 113         ENGINE_finish(rsa->engine);
 114         rsa->engine = NULL;
 115     }
 116 #endif
 117     rsa->meth = meth;
 118     if (meth->init)
 119         meth->init(rsa);
 120     return 1;
 121 }
 122
 123 RSA *RSA_new_method(ENGINE *engine)
 124 {
 125     RSA *ret;
 126
 127     ret = OPENSSL_zalloc(sizeof(*ret));
 128     if (ret == NULL) {
 129         RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_MALLOC_FAILURE);
 130         return NULL;
 131     }
 132
 133     ret->meth = RSA_get_default_method();
 134 #ifndef OPENSSL_NO_ENGINE
 135     if (engine) {
 136         if (!ENGINE_init(engine)) {
 137             RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 138             OPENSSL_free(ret);
 139             return NULL;
 140         }
 141         ret->engine = engine;
 142     } else
 143         ret->engine = ENGINE_get_default_RSA();
 144     if (ret->engine) {
 145         ret->meth = ENGINE_get_RSA(ret->engine);
 146         if (!ret->meth) {
 147             RSAerr(RSA_F_RSA_NEW_METHOD, ERR_R_ENGINE_LIB);
 148             ENGINE_finish(ret->engine);
 149             OPENSSL_free(ret);
 150             return NULL;
 151         }
 152     }
 153 #endif
 154
 155     ret->references = 1;
 156     ret->flags = ret->meth->flags & ~RSA_FLAG_NON_FIPS_ALLOW;
 157     if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data)) {
 158 #ifndef OPENSSL_NO_ENGINE
 159         if (ret->engine)
 160             ENGINE_finish(ret->engine);
 161 #endif
 162         OPENSSL_free(ret);
 163         return (NULL);
 164     }
 165
 166     if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
 167 #ifndef OPENSSL_NO_ENGINE
 168         if (ret->engine)
 169             ENGINE_finish(ret->engine);
 170 #endif
 171         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, ret, &ret->ex_data);
 172         OPENSSL_free(ret);
 173         ret = NULL;
 174     }
 175     return (ret);
 176 }
 177
 178 void RSA_free(RSA *r)
 179 {
 180     int i;
 181
 182     if (r == NULL)
 183         return;
 184
 185     i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_RSA);
 186     REF_PRINT_COUNT("RSA", r);
 187     if (i > 0)
 188         return;
 189     REF_ASSERT_ISNT(i < 0);
 190
 191     if (r->meth->finish)
 192         r->meth->finish(r);
 193 #ifndef OPENSSL_NO_ENGINE
 194     if (r->engine)
 195         ENGINE_finish(r->engine);
 196 #endif
 197
 198     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_RSA, r, &r->ex_data);
 199
 200     BN_clear_free(r->n);
 201     BN_clear_free(r->e);
 202     BN_clear_free(r->d);
 203     BN_clear_free(r->p);
 204     BN_clear_free(r->q);
 205     BN_clear_free(r->dmp1);
 206     BN_clear_free(r->dmq1);
 207     BN_clear_free(r->iqmp);
 208     BN_BLINDING_free(r->blinding);
 209     BN_BLINDING_free(r->mt_blinding);
 210     OPENSSL_free(r->bignum_data);
 211     OPENSSL_free(r);
 212 }
 213
 214 int RSA_up_ref(RSA *r)
 215 {
 216     int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_RSA);
 217
 218     REF_PRINT_COUNT("RSA", r);
 219     REF_ASSERT_ISNT(i < 2);
 220     return ((i > 1) ? 1 : 0);
 221 }
 222
 223 int RSA_set_ex_data(RSA *r, int idx, void *arg)
 224 {
 225     return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
 226 }
 227
 228 void *RSA_get_ex_data(const RSA *r, int idx)
 229 {
 230     return (CRYPTO_get_ex_data(&r->ex_data, idx));
 231 }
 232
 233 int RSA_memory_lock(RSA *r)
 234 {
 235     int i, j, k, off;
 236     char *p;
 237     BIGNUM *bn, **t[6], *b;
 238     BN_ULONG *ul;
 239
 240     if (r->d == NULL)
 241         return (1);
 242     t[0] = &r->d;
 243     t[1] = &r->p;
 244     t[2] = &r->q;
 245     t[3] = &r->dmp1;
 246     t[4] = &r->dmq1;
 247     t[5] = &r->iqmp;
 248     k = bn_sizeof_BIGNUM() * 6;
 249     off = k / sizeof(BN_ULONG) + 1;
 250     j = 1;
 251     for (i = 0; i < 6; i++)
 252         j += bn_get_top(*t[i]);
 253     if ((p = OPENSSL_malloc((off + j) * sizeof(*p))) == NULL) {
 254         RSAerr(RSA_F_RSA_MEMORY_LOCK, ERR_R_MALLOC_FAILURE);
 255         return (0);
 256     }
 257     memset(p, 0, sizeof(*p) * (off + j));
 258     bn = (BIGNUM *)p;
 259     ul = (BN_ULONG *)&(p[off]);
 260     for (i = 0; i < 6; i++) {
 261         b = *(t[i]);
 262         *(t[i]) = bn_array_el(bn, i);
 263         memcpy(bn_array_el(bn, i), b, bn_sizeof_BIGNUM());
 264         memcpy(ul, bn_get_words(b), sizeof(*ul) * bn_get_top(b));
 265         bn_set_static_words(bn_array_el(bn, i), ul, bn_get_top(b));
 266         ul += bn_get_top(b);
 267         BN_clear_free(b);
 268     }
 269
 270     /* I should fix this so it can still be done */
 271     r->flags &= ~(RSA_FLAG_CACHE_PRIVATE | RSA_FLAG_CACHE_PUBLIC);
 272
 273     r->bignum_data = p;
 274     return (1);
 275 }
 276
 277 int RSA_security_bits(const RSA *rsa)
 278 {
 279     return BN_security_bits(BN_num_bits(rsa->n), -1);
 280 }