crypto/asn1/a_bitstr.c

   1 /* crypto/asn1/a_bitstr.c */
   2 /* Copyright (C) 1995-1997 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,j,r,bits;
  72         unsigned char *p,*d;
  73
  74         if (a == NULL) return(0);
  75
  76         /* our bit strings are always a multiple of 8 :-) */
  77         bits=0;
  78         ret=1+a->length;
  79         r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
  80         if (pp == NULL) return(r);
  81         p= *pp;
  82
  83         ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
  84         if (bits == 0)
  85                 j=0;
  86         else    j=8-bits;
  87         *(p++)=(unsigned char)j;
  88         d=a->data;
  89         memcpy(p,d,a->length);
  90         p+=a->length;
  91         if (a->length > 0) p[-1]&=(0xff<<j);
  92         *pp=p;
  93         return(r);
  94         }
  95
  96 ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(a, pp, length)
  97 ASN1_BIT_STRING **a;
  98 unsigned char **pp;
  99 long length;
 100         {
 101         ASN1_BIT_STRING *ret=NULL;
 102         unsigned char *p,*s;
 103         long len;
 104         int inf,tag,xclass;
 105         int i;
 106
 107         if ((a == NULL) || ((*a) == NULL))
 108                 {
 109                 if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL);
 110                 }
 111         else
 112                 ret=(*a);
 113
 114         p= *pp;
 115         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 116         if (inf & 0x80)
 117                 {
 118                 i=ASN1_R_BAD_OBJECT_HEADER;
 119                 goto err;
 120                 }
 121
 122         if (tag != V_ASN1_BIT_STRING)
 123                 {
 124                 i=ASN1_R_EXPECTING_A_BIT_STRING;
 125                 goto err;
 126                 }
 127         if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
 128
 129         i= *(p++);
 130         if (len-- > 1) /* using one because of the bits left byte */
 131                 {
 132                 s=(unsigned char *)Malloc((int)len);
 133                 if (s == NULL)
 134                         {
 135                         i=ERR_R_MALLOC_FAILURE;
 136                         goto err;
 137                         }
 138                 memcpy(s,p,(int)len);
 139                 s[len-1]&=(0xff<<i);
 140                 p+=len;
 141                 }
 142         else
 143                 s=NULL;
 144
 145         ret->length=(int)len;
 146         if (ret->data != NULL) Free((char *)ret->data);
 147         ret->data=s;
 148         ret->type=V_ASN1_BIT_STRING;
 149         if (a != NULL) (*a)=ret;
 150         *pp=p;
 151         return(ret);
 152 err:
 153         ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
 154         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 155                 ASN1_BIT_STRING_free(ret);
 156         return(NULL);
 157         }
 158