crypto/asn1/a_bitstr.orig.c

   1 /* crypto/asn1/a_bitstr.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 "cryptlib.h"
  61 #include "asn1.h"
  62
  63 /* ASN1err(ASN1_F_ASN1_STRING_NEW,ASN1_R_STRING_TOO_SHORT);
  64  * ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,ASN1_R_EXPECTING_A_BIT_STRING);
  65  */
  66
  67 int i2d_ASN1_BIT_STRING(a,pp)
  68 ASN1_BIT_STRING *a;
  69 unsigned char **pp;
  70         {
  71         int ret,i,j,r,bits,len;
  72         unsigned char *p,*d;
  73
  74         if (a == NULL) return(0);
  75
  76         len=a->length;
  77
  78         if ((len > 0)
  79                 {
  80                 if (a->flags & ASN1_FG_BITS_LEFT))
  81                         {
  82                         bits=a->flags&0x07;
  83                         }
  84                 else
  85                         {
  86                         for ( ; len > 0; len--)
  87                                 {
  88                                 if (a->data[len-1]) break;
  89                                 }
  90                         j=a->data[len-1];
  91                         if      (j & 0x80) bits=1;
  92                         else if (j & 0x40) bits=2;
  93                         else if (j & 0x20) bits=3;
  94                         else if (j & 0x10) bits=4;
  95                         else if (j & 0x08) bits=5;
  96                         else if (j & 0x04) bits=6;
  97                         else if (j & 0x02) bits=7;
  98                         else if (j & 0x01) bits=8;
  99                         else bits=0;
 100                         }
 101                 }
 102         else
 103                 bits=0;
 104         ret=1+len;
 105         r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
 106         if (pp == NULL) return(r);
 107         p= *pp;
 108
 109         ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
 110         if (bits == 0)
 111                 j=0;
 112         else    j=8-bits;
 113         *(p++)=(unsigned char)j;
 114         d=a->data;
 115         memcpy(p,d,len);
 116         p+=len;
 117         if (len > 0) p[-1]&=(0xff<<j);
 118         *pp=p;
 119         return(r);
 120         }
 121
 122 ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(a, pp, length)
 123 ASN1_BIT_STRING **a;
 124 unsigned char **pp;
 125 long length;
 126         {
 127         ASN1_BIT_STRING *ret=NULL;
 128         unsigned char *p,*s;
 129         long len;
 130         int inf,tag,xclass;
 131         int i;
 132
 133         if ((a == NULL) || ((*a) == NULL))
 134                 {
 135                 if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL);
 136                 }
 137         else
 138                 ret=(*a);
 139
 140         p= *pp;
 141         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 142         if (inf & 0x80)
 143                 {
 144                 i=ASN1_R_BAD_OBJECT_HEADER;
 145                 goto err;
 146                 }
 147
 148         if (tag != V_ASN1_BIT_STRING)
 149                 {
 150                 i=ASN1_R_EXPECTING_A_BIT_STRING;
 151                 goto err;
 152                 }
 153         if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
 154
 155         i= *(p++);
 156         ret->flag&= ~(ASN1_FG_BITS_LEFT|0x07); /* clear */
 157         if (i > 0)
 158                 ret->flag|=(ASN1_FG_BITS_LEFT|(i&0x07)); /* set */
 159
 160         if (len-- > 1) /* using one because of the bits left byte */
 161                 {
 162                 s=(unsigned char *)Malloc((int)len);
 163                 if (s == NULL)
 164                         {
 165                         i=ERR_R_MALLOC_FAILURE;
 166                         goto err;
 167                         }
 168                 memcpy(s,p,(int)len);
 169                 s[len-1]&=(0xff<<i);
 170                 p+=len;
 171                 }
 172         else
 173                 s=NULL;
 174
 175         ret->length=(int)len;
 176         if (ret->data != NULL) Free((char *)ret->data);
 177         ret->data=s;
 178         ret->type=V_ASN1_BIT_STRING;
 179         if (a != NULL) (*a)=ret;
 180         *pp=p;
 181         return(ret);
 182 err:
 183         ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
 184         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 185                 ASN1_BIT_STRING_free(ret);
 186         return(NULL);
 187         }
 188
 189 /* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
 190  */
 191 int ASN1_BIT_STRING_set_bit(a,n,value)
 192 ASN1_BIT_STRING *a;
 193 int n;
 194 int value;
 195         {
 196         int w,v,iv;
 197         unsigned char *c;
 198
 199         w=n/8;
 200         v=1<<(7-(n&0x07));
 201         iv= ~v;
 202
 203         a->flag&= ~(ASN1_FG_BITS_LEFT|0x07); /* clear, set on write */
 204
 205         if (a == NULL) return(0);
 206         if ((a->length < (w+1)) || (a->data == NULL))
 207                 {
 208                 if (!value) return(1); /* Don't need to set */
 209                 if (a->data == NULL)
 210                         c=(unsigned char *)Malloc(w+1);
 211                 else
 212                         c=(unsigned char *)Realloc(a->data,w+1);
 213                 if (c == NULL) return(0);
 214                 a->data=c;
 215                 a->length=w+1;
 216                 c[w]=0;
 217                 }
 218         a->data[w]=((a->data[w])&iv)|v;
 219         while ((a->length > 0) && (a->data[a->length-1] == 0))
 220                 a->length--;
 221         return(1);
 222         }
 223
 224 int ASN1_BIT_STRING_get_bit(a,n)
 225 ASN1_BIT_STRING *a;
 226 int n;
 227         {
 228         int w,v;
 229
 230         w=n/8;
 231         v=1<<(7-(n&0x07));
 232         if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
 233                 return(0);
 234         return((a->data[w]&v) != 0);
 235         }
 236