crypto/asn1/a_bytes.c

   1 /* crypto/asn1/a_bytes.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 "asn1_mac.h"
  62
  63 /* ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,ASN1_R_WRONG_TYPE);
  64  * ASN1err(ASN1_F_ASN1_COLLATE_PRIMATIVE,ASN1_R_WRONG_TAG);
  65  */
  66
  67 static unsigned long tag2bit[32]={
  68 0,      0,      0,      B_ASN1_BIT_STRING,      /* tags  0 -  3 */
  69 B_ASN1_OCTET_STRING,    0,      0,              B_ASN1_UNKNOWN,/* tags  4- 7 */
  70 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags  8-11 */
  71 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 12-15 */
  72 0,      0,      B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING,
  73 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,0,
  74 0,B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,
  75 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN,
  76         };
  77
  78 #ifndef NOPROTO
  79 static int asn1_collate_primative(ASN1_STRING *a, ASN1_CTX *c);
  80 #else
  81 static int asn1_collate_primative();
  82 #endif
  83
  84 /* type is a 'bitmap' of acceptable string types to be accepted.
  85  */
  86 ASN1_STRING *d2i_ASN1_type_bytes(a, pp, length, type)
  87 ASN1_STRING **a;
  88 unsigned char **pp;
  89 long length;
  90 int type;
  91         {
  92         ASN1_STRING *ret=NULL;
  93         unsigned char *p,*s;
  94         long len;
  95         int inf,tag,xclass;
  96         int i=0;
  97
  98         p= *pp;
  99         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 100         if (inf & 0x80) goto err;
 101
 102         if (tag >= 32)
 103                 {
 104                 i=ASN1_R_TAG_VALUE_TOO_HIGH;;
 105                 goto err;
 106                 }
 107         if (!(tag2bit[tag] & type))
 108                 {
 109                 i=ASN1_R_WRONG_TYPE;
 110                 goto err;
 111                 }
 112
 113         /* If a bit-string, exit early */
 114         if (tag == V_ASN1_BIT_STRING)
 115                 return(d2i_ASN1_BIT_STRING(a,pp,length));
 116
 117         if ((a == NULL) || ((*a) == NULL))
 118                 {
 119                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 120                 }
 121         else
 122                 ret=(*a);
 123
 124         if (len != 0)
 125                 {
 126                 s=(unsigned char *)Malloc((int)len+1);
 127                 if (s == NULL)
 128                         {
 129                         i=ERR_R_MALLOC_FAILURE;
 130                         goto err;
 131                         }
 132                 memcpy(s,p,(int)len);
 133                 s[len]='\0';
 134                 p+=len;
 135                 }
 136         else
 137                 s=NULL;
 138
 139         if (ret->data != NULL) Free((char *)ret->data);
 140         ret->length=(int)len;
 141         ret->data=s;
 142         ret->type=tag;
 143         if (a != NULL) (*a)=ret;
 144         *pp=p;
 145         return(ret);
 146 err:
 147         ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
 148         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 149                 ASN1_STRING_free(ret);
 150         return(NULL);
 151         }
 152
 153 int i2d_ASN1_bytes(a, pp, tag, xclass)
 154 ASN1_STRING *a;
 155 unsigned char **pp;
 156 int tag;
 157 int xclass;
 158         {
 159         int ret,r,constructed;
 160         unsigned char *p;
 161
 162         if (a == NULL)  return(0);
 163
 164         if (tag == V_ASN1_BIT_STRING)
 165                 return(i2d_ASN1_BIT_STRING(a,pp));
 166
 167         ret=a->length;
 168         r=ASN1_object_size(0,ret,tag);
 169         if (pp == NULL) return(r);
 170         p= *pp;
 171
 172         if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
 173                 constructed=1;
 174         else
 175                 constructed=0;
 176         ASN1_put_object(&p,constructed,ret,tag,xclass);
 177         memcpy(p,a->data,a->length);
 178         p+=a->length;
 179         *pp= p;
 180         return(r);
 181         }
 182
 183 ASN1_STRING *d2i_ASN1_bytes(a, pp, length, Ptag, Pclass)
 184 ASN1_STRING **a;
 185 unsigned char **pp;
 186 long length;
 187 int Ptag;
 188 int Pclass;
 189         {
 190         ASN1_STRING *ret=NULL;
 191         unsigned char *p,*s;
 192         long len;
 193         int inf,tag,xclass;
 194         int i=0;
 195
 196         if ((a == NULL) || ((*a) == NULL))
 197                 {
 198                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 199                 }
 200         else
 201                 ret=(*a);
 202
 203         p= *pp;
 204         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 205         if (inf & 0x80)
 206                 {
 207                 i=ASN1_R_BAD_OBJECT_HEADER;
 208                 goto err;
 209                 }
 210
 211         if (tag != Ptag)
 212                 {
 213                 i=ASN1_R_WRONG_TAG;
 214                 goto err;
 215                 }
 216
 217         if (inf & V_ASN1_CONSTRUCTED)
 218                 {
 219                 ASN1_CTX c;
 220
 221                 c.pp=pp;
 222                 c.p=p;
 223                 c.inf=inf;
 224                 c.slen=len;
 225                 c.tag=Ptag;
 226                 c.xclass=Pclass;
 227                 c.max=(length == 0)?0:(p+length);
 228                 if (!asn1_collate_primative(ret,&c))
 229                         goto err;
 230                 else
 231                         {
 232                         p=c.p;
 233                         }
 234                 }
 235         else
 236                 {
 237                 if (len != 0)
 238                         {
 239                         if ((ret->length < len) || (ret->data == NULL))
 240                                 {
 241                                 if (ret->data != NULL) Free((char *)ret->data);
 242                                 s=(unsigned char *)Malloc((int)len);
 243                                 if (s == NULL)
 244                                         {
 245                                         i=ERR_R_MALLOC_FAILURE;
 246                                         goto err;
 247                                         }
 248                                 }
 249                         else
 250                                 s=ret->data;
 251                         memcpy(s,p,(int)len);
 252                         p+=len;
 253                         }
 254                 else
 255                         {
 256                         s=NULL;
 257                         if (ret->data != NULL) Free((char *)ret->data);
 258                         }
 259
 260                 ret->length=(int)len;
 261                 ret->data=s;
 262                 ret->type=Ptag;
 263                 }
 264
 265         if (a != NULL) (*a)=ret;
 266         *pp=p;
 267         return(ret);
 268 err:
 269         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 270                 ASN1_STRING_free(ret);
 271         ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
 272         return(NULL);
 273         }
 274
 275
 276 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapes
 277  * them into the one struture that is then returned */
 278 /* There have been a few bug fixes for this function from
 279  * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
 280 static int asn1_collate_primative(a,c)
 281 ASN1_STRING *a;
 282 ASN1_CTX *c;
 283         {
 284         ASN1_STRING *os=NULL;
 285         BUF_MEM b;
 286         int num;
 287
 288         b.length=0;
 289         b.max=0;
 290         b.data=NULL;
 291
 292         if (a == NULL)
 293                 {
 294                 c->error=ERR_R_PASSED_NULL_PARAMETER;
 295                 goto err;
 296                 }
 297
 298         num=0;
 299         for (;;)
 300                 {
 301                 if (c->inf & 1)
 302                         {
 303                         c->eos=ASN1_check_infinite_end(&c->p,
 304                                 (long)(c->max-c->p));
 305                         if (c->eos) break;
 306                         }
 307                 else
 308                         {
 309                         if (c->slen <= 0) break;
 310                         }
 311
 312                 c->q=c->p;
 313                 if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
 314                         == NULL)
 315                         {
 316                         c->error=ERR_R_ASN1_LIB;
 317                         goto err;
 318                         }
 319
 320                 if (!BUF_MEM_grow(&b,num+os->length))
 321                         {
 322                         c->error=ERR_R_BUF_LIB;
 323                         goto err;
 324                         }
 325                 memcpy(&(b.data[num]),os->data,os->length);
 326                 if (!(c->inf & 1))
 327                         c->slen-=(c->p-c->q);
 328                 num+=os->length;
 329                 }
 330
 331         if (!asn1_Finish(c)) goto err;
 332
 333         a->length=num;
 334         if (a->data != NULL) Free(a->data);
 335         a->data=(unsigned char *)b.data;
 336         if (os != NULL) ASN1_STRING_free(os);
 337         return(1);
 338 err:
 339         ASN1err(ASN1_F_ASN1_COLLATE_PRIMATIVE,c->error);
 340         if (os != NULL) ASN1_STRING_free(os);
 341         if (b.data != NULL) Free(b.data);
 342         return(0);
 343         }
 344