crypto/asn1/a_enum.c

   1 /* crypto/asn1/a_enum.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 /*
  64  * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
  65  * for comments on encoding see a_int.c
  66  */
  67
  68 int i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **pp)
  69         {
  70         int pad=0,ret,r,i,t;
  71         unsigned char *p,*n,pb=0;
  72
  73         if ((a == NULL) || (a->data == NULL)) return(0);
  74         t=a->type;
  75         if (a->length == 0)
  76                 ret=1;
  77         else
  78                 {
  79                 ret=a->length;
  80                 i=a->data[0];
  81                 if ((t == V_ASN1_ENUMERATED) && (i > 127)) {
  82                         pad=1;
  83                         pb=0;
  84                 } else if(t == V_ASN1_NEG_ENUMERATED) {
  85                         if(i>128) {
  86                                 pad=1;
  87                                 pb=0xFF;
  88                         } else if(i == 128) {
  89                                 for(i = 1; i < a->length; i++) if(a->data[i]) {
  90                                                 pad=1;
  91                                                 pb=0xFF;
  92                                                 break;
  93                                 }
  94                         }
  95                 }
  96                 ret+=pad;
  97                 }
  98         r=ASN1_object_size(0,ret,V_ASN1_ENUMERATED);
  99         if (pp == NULL) return(r);
 100         p= *pp;
 101
 102         ASN1_put_object(&p,0,ret,V_ASN1_ENUMERATED,V_ASN1_UNIVERSAL);
 103         if (pad) *(p++)=pb;
 104         if (a->length == 0)
 105                 *(p++)=0;
 106         else if (t == V_ASN1_ENUMERATED)
 107                 {
 108                 memcpy(p,a->data,(unsigned int)a->length);
 109                 p+=a->length;
 110                 }
 111         else {
 112                 /* Begin at the end of the encoding */
 113                 n=a->data + a->length - 1;
 114                 p += a->length - 1;
 115                 i = a->length;
 116                 /* Copy zeros to destination as long as source is zero */
 117                 while(!*n) {
 118                         *(p--) = 0;
 119                         n--;
 120                         i--;
 121                 }
 122                 /* Complement and increment next octet */
 123                 *(p--) = ((*(n--)) ^ 0xff) + 1;
 124                 i--;
 125                 /* Complement any octets left */
 126                 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
 127                 p += a->length;
 128         }
 129
 130         *pp=p;
 131         return(r);
 132         }
 133
 134 ASN1_ENUMERATED *d2i_ASN1_ENUMERATED(ASN1_ENUMERATED **a, unsigned char **pp,
 135              long length)
 136         {
 137         ASN1_ENUMERATED *ret=NULL;
 138         unsigned char *p,*to,*s;
 139         long len;
 140         int inf,tag,xclass;
 141         int i;
 142
 143         if ((a == NULL) || ((*a) == NULL))
 144                 {
 145                 if ((ret=ASN1_ENUMERATED_new()) == NULL) return(NULL);
 146                 ret->type=V_ASN1_ENUMERATED;
 147                 }
 148         else
 149                 ret=(*a);
 150
 151         p= *pp;
 152         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 153         if (inf & 0x80)
 154                 {
 155                 i=ASN1_R_BAD_OBJECT_HEADER;
 156                 goto err;
 157                 }
 158
 159         if (tag != V_ASN1_ENUMERATED)
 160                 {
 161                 i=ASN1_R_EXPECTING_AN_ENUMERATED;
 162                 goto err;
 163                 }
 164
 165         /* We must Malloc stuff, even for 0 bytes otherwise it
 166          * signifies a missing NULL parameter. */
 167         s=(unsigned char *)Malloc((int)len+1);
 168         if (s == NULL)
 169                 {
 170                 i=ERR_R_MALLOC_FAILURE;
 171                 goto err;
 172                 }
 173         to=s;
 174         if (*p & 0x80) /* a negative number */
 175                 {
 176                 ret->type=V_ASN1_NEG_ENUMERATED;
 177                 if ((*p == 0xff) && (len != 1)) {
 178                         p++;
 179                         len--;
 180                 }
 181                 i = len;
 182                 p += i - 1;
 183                 to += i - 1;
 184                 while((!*p) && i) {
 185                         *(to--) = 0;
 186                         i--;
 187                         p--;
 188                 }
 189                 if(!i) {
 190                         *s = 1;
 191                         s[len] = 0;
 192                         p += len;
 193                         len++;
 194                 } else {
 195                         *(to--) = (*(p--) ^ 0xff) + 1;
 196                         i--;
 197                         for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
 198                         p += len;
 199                 }
 200         } else {
 201                 ret->type=V_ASN1_ENUMERATED;
 202                 if ((*p == 0) && (len != 1))
 203                         {
 204                         p++;
 205                         len--;
 206                         }
 207                 memcpy(s,p,(int)len);
 208                 p+=len;
 209         }
 210
 211         if (ret->data != NULL) Free((char *)ret->data);
 212         ret->data=s;
 213         ret->length=(int)len;
 214         if (a != NULL) (*a)=ret;
 215         *pp=p;
 216         return(ret);
 217 err:
 218         ASN1err(ASN1_F_D2I_ASN1_ENUMERATED,i);
 219         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 220                 ASN1_ENUMERATED_free(ret);
 221         return(NULL);
 222         }
 223
 224 int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
 225         {
 226         int i,j,k;
 227         unsigned char buf[sizeof(long)+1];
 228         long d;
 229
 230         a->type=V_ASN1_ENUMERATED;
 231         if (a->length < (sizeof(long)+1))
 232                 {
 233                 if (a->data != NULL)
 234                         Free((char *)a->data);
 235                 if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL)
 236                         memset((char *)a->data,0,sizeof(long)+1);
 237                 }
 238         if (a->data == NULL)
 239                 {
 240                 ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE);
 241                 return(0);
 242                 }
 243         d=v;
 244         if (d < 0)
 245                 {
 246                 d= -d;
 247                 a->type=V_ASN1_NEG_ENUMERATED;
 248                 }
 249
 250         for (i=0; i<sizeof(long); i++)
 251                 {
 252                 if (d == 0) break;
 253                 buf[i]=(int)d&0xff;
 254                 d>>=8;
 255                 }
 256         j=0;
 257         for (k=i-1; k >=0; k--)
 258                 a->data[j++]=buf[k];
 259         a->length=j;
 260         return(1);
 261         }
 262
 263 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
 264         {
 265         int neg=0,i;
 266         long r=0;
 267
 268         if (a == NULL) return(0L);
 269         i=a->type;
 270         if (i == V_ASN1_NEG_ENUMERATED)
 271                 neg=1;
 272         else if (i != V_ASN1_ENUMERATED)
 273                 return(0);
 274
 275         if (a->length > sizeof(long))
 276                 {
 277                 /* hmm... a bit ugly */
 278                 return(0xffffffffL);
 279                 }
 280         if (a->data == NULL)
 281                 return(0);
 282
 283         for (i=0; i<a->length; i++)
 284                 {
 285                 r<<=8;
 286                 r|=(unsigned char)a->data[i];
 287                 }
 288         if (neg) r= -r;
 289         return(r);
 290         }
 291
 292 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
 293         {
 294         ASN1_ENUMERATED *ret;
 295         int len,j;
 296
 297         if (ai == NULL)
 298                 ret=ASN1_ENUMERATED_new();
 299         else
 300                 ret=ai;
 301         if (ret == NULL)
 302                 {
 303                 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR);
 304                 goto err;
 305                 }
 306         if(bn->neg) ret->type = V_ASN1_NEG_ENUMERATED;
 307         else ret->type=V_ASN1_ENUMERATED;
 308         j=BN_num_bits(bn);
 309         len=((j == 0)?0:((j/8)+1));
 310         ret->data=(unsigned char *)Malloc(len+4);
 311         ret->length=BN_bn2bin(bn,ret->data);
 312         return(ret);
 313 err:
 314         if (ret != ai) ASN1_ENUMERATED_free(ret);
 315         return(NULL);
 316         }
 317
 318 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
 319         {
 320         BIGNUM *ret;
 321
 322         if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
 323                 ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN,ASN1_R_BN_LIB);
 324         if(ai->type == V_ASN1_NEG_ENUMERATED) bn->neg = 1;
 325         return(ret);
 326         }