release/src/router/openssl/crypto/dsa/dsa_key.c

   1 /* crypto/dsa/dsa_key.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 <time.h>
  61 #include "cryptlib.h"
  62 #ifndef OPENSSL_NO_SHA
  63 #include <openssl/bn.h>
  64 #include <openssl/dsa.h>
  65 #include <openssl/rand.h>
  66
  67 #ifdef OPENSSL_FIPS
  68 #include <openssl/fips.h>
  69 #endif
  70
  71 static int dsa_builtin_keygen(DSA *dsa);
  72
  73 int DSA_generate_key(DSA *dsa)
  74         {
  75 #ifdef OPENSSL_FIPS
  76         if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD)
  77                         && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW))
  78                 {
  79                 DSAerr(DSA_F_DSA_GENERATE_KEY, DSA_R_NON_FIPS_DSA_METHOD);
  80                 return 0;
  81                 }
  82 #endif
  83         if(dsa->meth->dsa_keygen)
  84                 return dsa->meth->dsa_keygen(dsa);
  85 #ifdef OPENSSL_FIPS
  86         if (FIPS_mode())
  87                 return FIPS_dsa_generate_key(dsa);
  88 #endif
  89         return dsa_builtin_keygen(dsa);
  90         }
  91
  92 static int dsa_builtin_keygen(DSA *dsa)
  93         {
  94         int ok=0;
  95         BN_CTX *ctx=NULL;
  96         BIGNUM *pub_key=NULL,*priv_key=NULL;
  97
  98         if ((ctx=BN_CTX_new()) == NULL) goto err;
  99
 100         if (dsa->priv_key == NULL)
 101                 {
 102                 if ((priv_key=BN_new()) == NULL) goto err;
 103                 }
 104         else
 105                 priv_key=dsa->priv_key;
 106
 107         do
 108                 if (!BN_rand_range(priv_key,dsa->q)) goto err;
 109         while (BN_is_zero(priv_key));
 110
 111         if (dsa->pub_key == NULL)
 112                 {
 113                 if ((pub_key=BN_new()) == NULL) goto err;
 114                 }
 115         else
 116                 pub_key=dsa->pub_key;
 117
 118         {
 119                 BIGNUM local_prk;
 120                 BIGNUM *prk;
 121
 122                 if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
 123                         {
 124                         BN_init(&local_prk);
 125                         prk = &local_prk;
 126                         BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
 127                         }
 128                 else
 129                         prk = priv_key;
 130
 131                 if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err;
 132         }
 133
 134         dsa->priv_key=priv_key;
 135         dsa->pub_key=pub_key;
 136         ok=1;
 137
 138 err:
 139         if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key);
 140         if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key);
 141         if (ctx != NULL) BN_CTX_free(ctx);
 142         return(ok);
 143         }
 144 #endif