release/src/router/openssl/crypto/rsa/rsa_x931.c

   1 /* rsa_x931.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2005.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2005 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/bn.h>
  62 #include <openssl/rsa.h>
  63 #include <openssl/rand.h>
  64 #include <openssl/objects.h>
  65
  66 int RSA_padding_add_X931(unsigned char *to, int tlen,
  67              const unsigned char *from, int flen)
  68         {
  69         int j;
  70         unsigned char *p;
  71
  72         /* Absolute minimum amount of padding is 1 header nibble, 1 padding
  73          * nibble and 2 trailer bytes: but 1 hash if is already in 'from'.
  74          */
  75
  76         j = tlen - flen - 2;
  77
  78         if (j < 0)
  79                 {
  80                 RSAerr(RSA_F_RSA_PADDING_ADD_X931,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE);
  81                 return -1;
  82                 }
  83
  84         p=(unsigned char *)to;
  85
  86         /* If no padding start and end nibbles are in one byte */
  87         if (j == 0)
  88                 *p++ = 0x6A;
  89         else
  90                 {
  91                 *p++ = 0x6B;
  92                 if (j > 1)
  93                         {
  94                         memset(p, 0xBB, j - 1);
  95                         p += j - 1;
  96                         }
  97                 *p++ = 0xBA;
  98                 }
  99         memcpy(p,from,(unsigned int)flen);
 100         p += flen;
 101         *p = 0xCC;
 102         return(1);
 103         }
 104
 105 int RSA_padding_check_X931(unsigned char *to, int tlen,
 106              const unsigned char *from, int flen, int num)
 107         {
 108         int i = 0,j;
 109         const unsigned char *p;
 110
 111         p=from;
 112         if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B)))
 113                 {
 114                 RSAerr(RSA_F_RSA_PADDING_CHECK_X931,RSA_R_INVALID_HEADER);
 115                 return -1;
 116                 }
 117
 118         if (*p++ == 0x6B)
 119                 {
 120                 j=flen-3;
 121                 for (i = 0; i < j; i++)
 122                         {
 123                         unsigned char c = *p++;
 124                         if (c == 0xBA)
 125                                 break;
 126                         if (c != 0xBB)
 127                                 {
 128                                 RSAerr(RSA_F_RSA_PADDING_CHECK_X931,
 129                                         RSA_R_INVALID_PADDING);
 130                                 return -1;
 131                                 }
 132                         }
 133
 134                 j -= i;
 135
 136                 if (i == 0)
 137                         {
 138                         RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING);
 139                         return -1;
 140                         }
 141
 142                 }
 143         else j = flen - 2;
 144
 145         if (p[j] != 0xCC)
 146                 {
 147                 RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_TRAILER);
 148                 return -1;
 149                 }
 150
 151         memcpy(to,p,(unsigned int)j);
 152
 153         return(j);
 154         }
 155
 156 /* Translate between X931 hash ids and NIDs */
 157
 158 int RSA_X931_hash_id(int nid)
 159         {
 160         switch (nid)
 161                 {
 162                 case NID_sha1:
 163                 return 0x33;
 164
 165                 case NID_sha256:
 166                 return 0x34;
 167
 168                 case NID_sha384:
 169                 return 0x36;
 170
 171                 case NID_sha512:
 172                 return 0x35;
 173
 174                 }
 175         return -1;
 176         }
 177