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 ASN1_ENUMERATED *ASN1_ENUMERATED_new(void)
  69 { return M_ASN1_ENUMERATED_new(); }
  70
  71 void ASN1_ENUMERATED_free(ASN1_ENUMERATED *x)
  72 { M_ASN1_ENUMERATED_free(x); }
  73
  74 int i2d_ASN1_ENUMERATED(ASN1_ENUMERATED *a, unsigned char **pp)
  75         {
  76         int pad=0,ret,r,i,t;
  77         unsigned char *p,*n,pb=0;
  78
  79         if ((a == NULL) || (a->data == NULL)) return(0);
  80         t=a->type;
  81         if (a->length == 0)
  82                 ret=1;
  83         else
  84                 {
  85                 ret=a->length;
  86                 i=a->data[0];
  87                 if ((t == V_ASN1_ENUMERATED) && (i > 127)) {
  88                         pad=1;
  89                         pb=0;
  90                 } else if(t == V_ASN1_NEG_ENUMERATED) {
  91                         if(i>128) {
  92                                 pad=1;
  93                                 pb=0xFF;
  94                         } else if(i == 128) {
  95                                 for(i = 1; i < a->length; i++) if(a->data[i]) {
  96                                                 pad=1;
  97                                                 pb=0xFF;
  98                                                 break;
  99                                 }
 100                         }
 101                 }
 102                 ret+=pad;
 103                 }
 104         r=ASN1_object_size(0,ret,V_ASN1_ENUMERATED);
 105         if (pp == NULL) return(r);
 106         p= *pp;
 107
 108         ASN1_put_object(&p,0,ret,V_ASN1_ENUMERATED,V_ASN1_UNIVERSAL);
 109         if (pad) *(p++)=pb;
 110         if (a->length == 0)
 111                 *(p++)=0;
 112         else if (t == V_ASN1_ENUMERATED)
 113                 {
 114                 memcpy(p,a->data,(unsigned int)a->length);
 115                 p+=a->length;
 116                 }
 117         else {
 118                 /* Begin at the end of the encoding */
 119                 n=a->data + a->length - 1;
 120                 p += a->length - 1;
 121                 i = a->length;
 122                 /* Copy zeros to destination as long as source is zero */
 123                 while(!*n) {
 124                         *(p--) = 0;
 125                         n--;
 126                         i--;
 127                 }
 128                 /* Complement and increment next octet */
 129                 *(p--) = ((*(n--)) ^ 0xff) + 1;
 130                 i--;
 131                 /* Complement any octets left */
 132                 for(;i > 0; i--) *(p--) = *(n--) ^ 0xff;
 133                 p += a->length;
 134         }
 135
 136         *pp=p;
 137         return(r);
 138         }
 139
 140 ASN1_ENUMERATED *d2i_ASN1_ENUMERATED(ASN1_ENUMERATED **a, unsigned char **pp,
 141              long length)
 142         {
 143         ASN1_ENUMERATED *ret=NULL;
 144         unsigned char *p,*to,*s;
 145         long len;
 146         int inf,tag,xclass;
 147         int i;
 148
 149         if ((a == NULL) || ((*a) == NULL))
 150                 {
 151                 if ((ret=M_ASN1_ENUMERATED_new()) == NULL) return(NULL);
 152                 ret->type=V_ASN1_ENUMERATED;
 153                 }
 154         else
 155                 ret=(*a);
 156
 157         p= *pp;
 158         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 159         if (inf & 0x80)
 160                 {
 161                 i=ASN1_R_BAD_OBJECT_HEADER;
 162                 goto err;
 163                 }
 164
 165         if (tag != V_ASN1_ENUMERATED)
 166                 {
 167                 i=ASN1_R_EXPECTING_AN_ENUMERATED;
 168                 goto err;
 169                 }
 170
 171         /* We must Malloc stuff, even for 0 bytes otherwise it
 172          * signifies a missing NULL parameter. */
 173         s=(unsigned char *)Malloc((int)len+1);
 174         if (s == NULL)
 175                 {
 176                 i=ERR_R_MALLOC_FAILURE;
 177                 goto err;
 178                 }
 179         to=s;
 180         if(!len) {
 181                 /* Strictly speaking this is an illegal ENUMERATED but we
 182                  * tolerate it.
 183                  */
 184                 ret->type=V_ASN1_ENUMERATED;
 185         } else if (*p & 0x80) /* a negative number */
 186                 {
 187                 ret->type=V_ASN1_NEG_ENUMERATED;
 188                 if ((*p == 0xff) && (len != 1)) {
 189                         p++;
 190                         len--;
 191                 }
 192                 i = len;
 193                 p += i - 1;
 194                 to += i - 1;
 195                 while((!*p) && i) {
 196                         *(to--) = 0;
 197                         i--;
 198                         p--;
 199                 }
 200                 if(!i) {
 201                         *s = 1;
 202                         s[len] = 0;
 203                         p += len;
 204                         len++;
 205                 } else {
 206                         *(to--) = (*(p--) ^ 0xff) + 1;
 207                         i--;
 208                         for(;i > 0; i--) *(to--) = *(p--) ^ 0xff;
 209                         p += len;
 210                 }
 211         } else {
 212                 ret->type=V_ASN1_ENUMERATED;
 213                 if ((*p == 0) && (len != 1))
 214                         {
 215                         p++;
 216                         len--;
 217                         }
 218                 memcpy(s,p,(int)len);
 219                 p+=len;
 220         }
 221
 222         if (ret->data != NULL) Free((char *)ret->data);
 223         ret->data=s;
 224         ret->length=(int)len;
 225         if (a != NULL) (*a)=ret;
 226         *pp=p;
 227         return(ret);
 228 err:
 229         ASN1err(ASN1_F_D2I_ASN1_ENUMERATED,i);
 230         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 231                 M_ASN1_ENUMERATED_free(ret);
 232         return(NULL);
 233         }
 234
 235 int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
 236         {
 237         int i,j,k;
 238         unsigned char buf[sizeof(long)+1];
 239         long d;
 240
 241         a->type=V_ASN1_ENUMERATED;
 242         if (a->length < (sizeof(long)+1))
 243                 {
 244                 if (a->data != NULL)
 245                         Free((char *)a->data);
 246                 if ((a->data=(unsigned char *)Malloc(sizeof(long)+1)) != NULL)
 247                         memset((char *)a->data,0,sizeof(long)+1);
 248                 }
 249         if (a->data == NULL)
 250                 {
 251                 ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE);
 252                 return(0);
 253                 }
 254         d=v;
 255         if (d < 0)
 256                 {
 257                 d= -d;
 258                 a->type=V_ASN1_NEG_ENUMERATED;
 259                 }
 260
 261         for (i=0; i<sizeof(long); i++)
 262                 {
 263                 if (d == 0) break;
 264                 buf[i]=(int)d&0xff;
 265                 d>>=8;
 266                 }
 267         j=0;
 268         for (k=i-1; k >=0; k--)
 269                 a->data[j++]=buf[k];
 270         a->length=j;
 271         return(1);
 272         }
 273
 274 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
 275         {
 276         int neg=0,i;
 277         long r=0;
 278
 279         if (a == NULL) return(0L);
 280         i=a->type;
 281         if (i == V_ASN1_NEG_ENUMERATED)
 282                 neg=1;
 283         else if (i != V_ASN1_ENUMERATED)
 284                 return(0);
 285
 286         if (a->length > sizeof(long))
 287                 {
 288                 /* hmm... a bit ugly */
 289                 return(0xffffffffL);
 290                 }
 291         if (a->data == NULL)
 292                 return(0);
 293
 294         for (i=0; i<a->length; i++)
 295                 {
 296                 r<<=8;
 297                 r|=(unsigned char)a->data[i];
 298                 }
 299         if (neg) r= -r;
 300         return(r);
 301         }
 302
 303 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
 304         {
 305         ASN1_ENUMERATED *ret;
 306         int len,j;
 307
 308         if (ai == NULL)
 309                 ret=M_ASN1_ENUMERATED_new();
 310         else
 311                 ret=ai;
 312         if (ret == NULL)
 313                 {
 314                 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR);
 315                 goto err;
 316                 }
 317         if(bn->neg) ret->type = V_ASN1_NEG_ENUMERATED;
 318         else ret->type=V_ASN1_ENUMERATED;
 319         j=BN_num_bits(bn);
 320         len=((j == 0)?0:((j/8)+1));
 321         ret->data=(unsigned char *)Malloc(len+4);
 322         ret->length=BN_bn2bin(bn,ret->data);
 323         return(ret);
 324 err:
 325         if (ret != ai) M_ASN1_ENUMERATED_free(ret);
 326         return(NULL);
 327         }
 328
 329 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
 330         {
 331         BIGNUM *ret;
 332
 333         if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
 334                 ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN,ASN1_R_BN_LIB);
 335         if(ai->type == V_ASN1_NEG_ENUMERATED) bn->neg = 1;
 336         return(ret);
 337         }