crypto/asn1/a_bitstr.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 <openssl/asn1.h>
  62
  63 ASN1_BIT_STRING *ASN1_BIT_STRING_new(void)
  64 { return M_ASN1_BIT_STRING_new(); }
  65
  66 void ASN1_BIT_STRING_free(ASN1_BIT_STRING *x)
  67 { M_ASN1_BIT_STRING_free(x); }
  68
  69 int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
  70 { return M_ASN1_BIT_STRING_set(x, d, len); }
  71
  72 int i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
  73         {
  74         int ret,j,r,bits,len;
  75         unsigned char *p,*d;
  76
  77         if (a == NULL) return(0);
  78
  79         len=a->length;
  80
  81         if (len > 0)
  82                 {
  83                 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
  84                         {
  85                         bits=(int)a->flags&0x07;
  86                         }
  87                 else
  88                         {
  89                         for ( ; len > 0; len--)
  90                                 {
  91                                 if (a->data[len-1]) break;
  92                                 }
  93                         j=a->data[len-1];
  94                         if      (j & 0x01) bits=0;
  95                         else if (j & 0x02) bits=1;
  96                         else if (j & 0x04) bits=2;
  97                         else if (j & 0x08) bits=3;
  98                         else if (j & 0x10) bits=4;
  99                         else if (j & 0x20) bits=5;
 100                         else if (j & 0x40) bits=6;
 101                         else if (j & 0x80) bits=7;
 102                         else bits=0; /* should not happen */
 103                         }
 104                 }
 105         else
 106                 bits=0;
 107         ret=1+len;
 108         r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
 109         if (pp == NULL) return(r);
 110         p= *pp;
 111
 112         ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
 113         *(p++)=(unsigned char)bits;
 114         d=a->data;
 115         memcpy(p,d,len);
 116         p+=len;
 117         if (len > 0) p[-1]&=(0xff<<bits);
 118         *pp=p;
 119         return(r);
 120         }
 121
 122 ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
 123              long length)
 124         {
 125         ASN1_BIT_STRING *ret=NULL;
 126         unsigned char *p,*s;
 127         long len;
 128         int inf,tag,xclass;
 129         int i;
 130
 131         if ((a == NULL) || ((*a) == NULL))
 132                 {
 133                 if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL);
 134                 }
 135         else
 136                 ret=(*a);
 137
 138         p= *pp;
 139         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 140         if (inf & 0x80)
 141                 {
 142                 i=ASN1_R_BAD_OBJECT_HEADER;
 143                 goto err;
 144                 }
 145
 146         if (tag != V_ASN1_BIT_STRING)
 147                 {
 148                 i=ASN1_R_EXPECTING_A_BIT_STRING;
 149                 goto err;
 150                 }
 151         if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
 152
 153         i= *(p++);
 154         /* We do this to preserve the settings.  If we modify
 155          * the settings, via the _set_bit function, we will recalculate
 156          * on output */
 157         ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
 158         ret->flags|=(ASN1_STRING_FLAG_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(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                 M_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(ASN1_BIT_STRING *a, int n, int value)
 192         {
 193         int w,v,iv;
 194         unsigned char *c;
 195
 196         w=n/8;
 197         v=1<<(7-(n&0x07));
 198         iv= ~v;
 199
 200         a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
 201
 202         if (a == NULL) return(0);
 203         if ((a->length < (w+1)) || (a->data == NULL))
 204                 {
 205                 if (!value) return(1); /* Don't need to set */
 206                 if (a->data == NULL)
 207                         c=(unsigned char *)Malloc(w+1);
 208                 else
 209                         c=(unsigned char *)Realloc(a->data,w+1);
 210                 if (c == NULL) return(0);
 211                 a->data=c;
 212                 a->length=w+1;
 213                 c[w]=0;
 214                 }
 215         a->data[w]=((a->data[w])&iv)|v;
 216         while ((a->length > 0) && (a->data[a->length-1] == 0))
 217                 a->length--;
 218         return(1);
 219         }
 220
 221 int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
 222         {
 223         int w,v;
 224
 225         w=n/8;
 226         v=1<<(7-(n&0x07));
 227         if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
 228                 return(0);
 229         return((a->data[w]&v) != 0);
 230         }
 231