release/src/router/openssl/crypto/asn1/x_bignum.c

   1 /* x_bignum.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2000.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2000 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/asn1t.h>
  62 #include <openssl/bn.h>
  63
  64 /* Custom primitive type for BIGNUM handling. This reads in an ASN1_INTEGER as a
  65  * BIGNUM directly. Currently it ignores the sign which isn't a problem since all
  66  * BIGNUMs used are non negative and anything that looks negative is normally due
  67  * to an encoding error.
  68  */
  69
  70 #define BN_SENSITIVE    1
  71
  72 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it);
  73 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it);
  74
  75 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it);
  76 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len, int utype, char *free_cont, const ASN1_ITEM *it);
  77
  78 static ASN1_PRIMITIVE_FUNCS bignum_pf = {
  79         NULL, 0,
  80         bn_new,
  81         bn_free,
  82         0,
  83         bn_c2i,
  84         bn_i2c
  85 };
  86
  87 ASN1_ITEM_start(BIGNUM)
  88         ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, 0, "BIGNUM"
  89 ASN1_ITEM_end(BIGNUM)
  90
  91 ASN1_ITEM_start(CBIGNUM)
  92         ASN1_ITYPE_PRIMITIVE, V_ASN1_INTEGER, NULL, 0, &bignum_pf, BN_SENSITIVE, "BIGNUM"
  93 ASN1_ITEM_end(CBIGNUM)
  94
  95 static int bn_new(ASN1_VALUE **pval, const ASN1_ITEM *it)
  96 {
  97         *pval = (ASN1_VALUE *)BN_new();
  98         if(*pval) return 1;
  99         else return 0;
 100 }
 101
 102 static void bn_free(ASN1_VALUE **pval, const ASN1_ITEM *it)
 103 {
 104         if(!*pval) return;
 105         if(it->size & BN_SENSITIVE) BN_clear_free((BIGNUM *)*pval);
 106         else BN_free((BIGNUM *)*pval);
 107         *pval = NULL;
 108 }
 109
 110 static int bn_i2c(ASN1_VALUE **pval, unsigned char *cont, int *putype, const ASN1_ITEM *it)
 111 {
 112         BIGNUM *bn;
 113         int pad;
 114         if(!*pval) return -1;
 115         bn = (BIGNUM *)*pval;
 116         /* If MSB set in an octet we need a padding byte */
 117         if(BN_num_bits(bn) & 0x7) pad = 0;
 118         else pad = 1;
 119         if(cont) {
 120                 if(pad) *cont++ = 0;
 121                 BN_bn2bin(bn, cont);
 122         }
 123         return pad + BN_num_bytes(bn);
 124 }
 125
 126 static int bn_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
 127                   int utype, char *free_cont, const ASN1_ITEM *it)
 128 {
 129         BIGNUM *bn;
 130         if(!*pval) bn_new(pval, it);
 131         bn  = (BIGNUM *)*pval;
 132         if(!BN_bin2bn(cont, len, bn)) {
 133                 bn_free(pval, it);
 134                 return 0;
 135         }
 136         return 1;
 137 }
 138
 139