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 len, ret;
  75         len = i2c_ASN1_BIT_STRING(a, NULL);
  76         ret=ASN1_object_size(0,len,V_ASN1_BIT_STRING);
  77         if(pp) {
  78                 ASN1_put_object(pp,0,len,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
  79                 i2c_ASN1_BIT_STRING(a, pp);
  80         }
  81         return ret;
  82 }
  83
  84 int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
  85         {
  86         int ret,j,bits,len;
  87         unsigned char *p,*d;
  88
  89         if (a == NULL) return(0);
  90
  91         len=a->length;
  92         ret=1+len;
  93         if (pp == NULL) return(ret);
  94
  95         if (len > 0)
  96                 {
  97                 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
  98                         {
  99                         bits=(int)a->flags&0x07;
 100                         }
 101                 else
 102                         {
 103                         for ( ; len > 0; len--)
 104                                 {
 105                                 if (a->data[len-1]) break;
 106                                 }
 107                         j=a->data[len-1];
 108                         if      (j & 0x01) bits=0;
 109                         else if (j & 0x02) bits=1;
 110                         else if (j & 0x04) bits=2;
 111                         else if (j & 0x08) bits=3;
 112                         else if (j & 0x10) bits=4;
 113                         else if (j & 0x20) bits=5;
 114                         else if (j & 0x40) bits=6;
 115                         else if (j & 0x80) bits=7;
 116                         else bits=0; /* should not happen */
 117                         }
 118                 }
 119         else
 120                 bits=0;
 121         p= *pp;
 122
 123         *(p++)=(unsigned char)bits;
 124         d=a->data;
 125         memcpy(p,d,len);
 126         p+=len;
 127         if (len > 0) p[-1]&=(0xff<<bits);
 128         *pp=p;
 129         return(ret);
 130         }
 131
 132
 133 /* Convert DER encoded ASN1 BIT_STRING to ASN1_BIT_STRING structure */
 134 ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
 135              long length)
 136 {
 137         unsigned char *p;
 138         long len;
 139         int i;
 140         int inf,tag,xclass;
 141         ASN1_BIT_STRING *ret;
 142
 143         p= *pp;
 144         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 145         if (inf & 0x80)
 146                 {
 147                 i=ASN1_R_BAD_OBJECT_HEADER;
 148                 goto err;
 149                 }
 150
 151         if (tag != V_ASN1_BIT_STRING)
 152                 {
 153                 i=ASN1_R_EXPECTING_A_BIT_STRING;
 154                 goto err;
 155                 }
 156         if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
 157         ret = c2i_ASN1_BIT_STRING(a, &p, len);
 158         if(ret) *pp = p;
 159         return ret;
 160 err:
 161         ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
 162         return(NULL);
 163
 164 }
 165
 166 ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
 167              long len)
 168         {
 169         ASN1_BIT_STRING *ret=NULL;
 170         unsigned char *p,*s;
 171         int i;
 172
 173         if ((a == NULL) || ((*a) == NULL))
 174                 {
 175                 if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL);
 176                 }
 177         else
 178                 ret=(*a);
 179
 180         p= *pp;
 181         i= *(p++);
 182         /* We do this to preserve the settings.  If we modify
 183          * the settings, via the _set_bit function, we will recalculate
 184          * on output */
 185         ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
 186         ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
 187
 188         if (len-- > 1) /* using one because of the bits left byte */
 189                 {
 190                 s=(unsigned char *)OPENSSL_malloc((int)len);
 191                 if (s == NULL)
 192                         {
 193                         i=ERR_R_MALLOC_FAILURE;
 194                         goto err;
 195                         }
 196                 memcpy(s,p,(int)len);
 197                 s[len-1]&=(0xff<<i);
 198                 p+=len;
 199                 }
 200         else
 201                 s=NULL;
 202
 203         ret->length=(int)len;
 204         if (ret->data != NULL) OPENSSL_free(ret->data);
 205         ret->data=s;
 206         ret->type=V_ASN1_BIT_STRING;
 207         if (a != NULL) (*a)=ret;
 208         *pp=p;
 209         return(ret);
 210 err:
 211         ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
 212         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 213                 M_ASN1_BIT_STRING_free(ret);
 214         return(NULL);
 215         }
 216
 217 /* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
 218  */
 219 int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
 220         {
 221         int w,v,iv;
 222         unsigned char *c;
 223
 224         w=n/8;
 225         v=1<<(7-(n&0x07));
 226         iv= ~v;
 227
 228         a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
 229
 230         if (a == NULL) return(0);
 231         if ((a->length < (w+1)) || (a->data == NULL))
 232                 {
 233                 if (!value) return(1); /* Don't need to set */
 234                 if (a->data == NULL)
 235                         c=(unsigned char *)OPENSSL_malloc(w+1);
 236                 else
 237                         c=(unsigned char *)OPENSSL_realloc(a->data,w+1);
 238                 if (c == NULL) return(0);
 239                 a->data=c;
 240                 a->length=w+1;
 241                 c[w]=0;
 242                 }
 243         a->data[w]=((a->data[w])&iv)|v;
 244         while ((a->length > 0) && (a->data[a->length-1] == 0))
 245                 a->length--;
 246         return(1);
 247         }
 248
 249 int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
 250         {
 251         int w,v;
 252
 253         w=n/8;
 254         v=1<<(7-(n&0x07));
 255         if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
 256                 return(0);
 257         return((a->data[w]&v) != 0);
 258         }
 259