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_ASN1_TYPE_NEW,ASN1_R_ERROR_STACK);
  64  * ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,ASN1_R_ERROR_STACK);
  65  * ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,ASN1_R_WRONG_TYPE);
  66  * ASN1err(ASN1_F_ASN1_COLLATE_PRIMATIVE,ASN1_R_WRONG_TAG);
  67  */
  68
  69 static unsigned long tag2bit[32]={
  70 0,      0,      0,      B_ASN1_BIT_STRING,      /* tags  0 -  3 */
  71 B_ASN1_OCTET_STRING,    0,      0,              B_ASN1_UNKNOWN,/* tags  4- 7 */
  72 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags  8-11 */
  73 B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN, B_ASN1_UNKNOWN,/* tags 12-15 */
  74 0,      0,      B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING,
  75 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,0,
  76 0,B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,
  77 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN,
  78         };
  79
  80 #ifndef NOPROTO
  81 static int asn1_collate_primative(ASN1_STRING *a, ASN1_CTX *c);
  82 #else
  83 static int asn1_collate_primative();
  84 #endif
  85
  86 /* type is a 'bitmap' of acceptable string types to be accepted.
  87  */
  88 ASN1_STRING *d2i_ASN1_type_bytes(a, pp, length, type)
  89 ASN1_STRING **a;
  90 unsigned char **pp;
  91 long length;
  92 int type;
  93         {
  94         ASN1_STRING *ret=NULL;
  95         unsigned char *p,*s;
  96         long len;
  97         int inf,tag,xclass;
  98         int i=0;
  99
 100         p= *pp;
 101         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 102         if (inf & 0x80) goto err;
 103
 104         if (tag >= 32)
 105                 {
 106                 i=ASN1_R_TAG_VALUE_TOO_HIGH;;
 107                 goto err;
 108                 }
 109         if (!(tag2bit[tag] & type))
 110                 {
 111                 i=ASN1_R_WRONG_TYPE;
 112                 goto err;
 113                 }
 114
 115         /* If a bit-string, exit early */
 116         if (tag == V_ASN1_BIT_STRING)
 117                 return(d2i_ASN1_BIT_STRING(a,pp,length));
 118
 119         if ((a == NULL) || ((*a) == NULL))
 120                 {
 121                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 122                 }
 123         else
 124                 ret=(*a);
 125
 126         if (len != 0)
 127                 {
 128                 s=(unsigned char *)Malloc((int)len+1);
 129                 if (s == NULL)
 130                         {
 131                         i=ERR_R_MALLOC_FAILURE;
 132                         goto err;
 133                         }
 134                 memcpy(s,p,(int)len);
 135                 s[len]='\0';
 136                 p+=len;
 137                 }
 138         else
 139                 s=NULL;
 140
 141         if (ret->data != NULL) Free((char *)ret->data);
 142         ret->length=(int)len;
 143         ret->data=s;
 144         ret->type=tag;
 145         if (a != NULL) (*a)=ret;
 146         *pp=p;
 147         return(ret);
 148 err:
 149         ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
 150         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 151                 ASN1_STRING_free(ret);
 152         return(NULL);
 153         }
 154
 155 int i2d_ASN1_bytes(a, pp, tag, xclass)
 156 ASN1_STRING *a;
 157 unsigned char **pp;
 158 int tag;
 159 int xclass;
 160         {
 161         int ret,r,constructed;
 162         unsigned char *p;
 163
 164         if (a == NULL)  return(0);
 165
 166         if (tag == V_ASN1_BIT_STRING)
 167                 return(i2d_ASN1_BIT_STRING(a,pp));
 168
 169         ret=a->length;
 170         r=ASN1_object_size(0,ret,tag);
 171         if (pp == NULL) return(r);
 172         p= *pp;
 173
 174         if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
 175                 constructed=1;
 176         else
 177                 constructed=0;
 178         ASN1_put_object(&p,constructed,ret,tag,xclass);
 179         memcpy(p,a->data,a->length);
 180         p+=a->length;
 181         *pp= p;
 182         return(r);
 183         }
 184
 185 ASN1_STRING *d2i_ASN1_bytes(a, pp, length, Ptag, Pclass)
 186 ASN1_STRING **a;
 187 unsigned char **pp;
 188 long length;
 189 int Ptag;
 190 int Pclass;
 191         {
 192         ASN1_STRING *ret=NULL;
 193         unsigned char *p,*s;
 194         long len;
 195         int inf,tag,xclass;
 196         int i=0;
 197
 198         if ((a == NULL) || ((*a) == NULL))
 199                 {
 200                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 201                 }
 202         else
 203                 ret=(*a);
 204
 205         p= *pp;
 206         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 207         if (inf & 0x80)
 208                 {
 209                 i=ASN1_R_BAD_OBJECT_HEADER;
 210                 goto err;
 211                 }
 212
 213         if (tag != Ptag)
 214                 {
 215                 i=ASN1_R_WRONG_TAG;
 216                 goto err;
 217                 }
 218
 219         if (inf & V_ASN1_CONSTRUCTED)
 220                 {
 221                 ASN1_CTX c;
 222
 223                 c.pp=pp;
 224                 c.p=p;
 225                 c.inf=inf;
 226                 c.slen=len;
 227                 c.tag=Ptag;
 228                 c.xclass=Pclass;
 229                 c.max=(length == 0)?0:(p+length);
 230                 if (!asn1_collate_primative(ret,&c))
 231                         goto err;
 232                 else
 233                         {
 234                         p=c.p;
 235                         }
 236                 }
 237         else
 238                 {
 239                 if (len != 0)
 240                         {
 241                         if ((ret->length < len) || (ret->data == NULL))
 242                                 {
 243                                 if (ret->data != NULL) Free((char *)ret->data);
 244                                 s=(unsigned char *)Malloc((int)len);
 245                                 if (s == NULL)
 246                                         {
 247                                         i=ERR_R_MALLOC_FAILURE;
 248                                         goto err;
 249                                         }
 250                                 }
 251                         else
 252                                 s=ret->data;
 253                         memcpy(s,p,(int)len);
 254                         p+=len;
 255                         }
 256                 else
 257                         {
 258                         s=NULL;
 259                         if (ret->data != NULL) Free((char *)ret->data);
 260                         }
 261
 262                 ret->length=(int)len;
 263                 ret->data=s;
 264                 ret->type=Ptag;
 265                 }
 266
 267         if (a != NULL) (*a)=ret;
 268         *pp=p;
 269         return(ret);
 270 err:
 271         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 272                 ASN1_STRING_free(ret);
 273         ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
 274         return(NULL);
 275         }
 276
 277
 278 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapes
 279  * them into the one struture that is then returned */
 280 /* There have been a few bug fixes for this function from
 281  * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
 282 static int asn1_collate_primative(a,c)
 283 ASN1_STRING *a;
 284 ASN1_CTX *c;
 285         {
 286         ASN1_STRING *os=NULL;
 287         BUF_MEM b;
 288         int num;
 289
 290         b.length=0;
 291         b.max=0;
 292         b.data=NULL;
 293
 294         if (a == NULL)
 295                 {
 296                 c->error=ERR_R_PASSED_NULL_PARAMETER;
 297                 goto err;
 298                 }
 299
 300         num=0;
 301         for (;;)
 302                 {
 303                 if (c->inf & 1)
 304                         {
 305                         c->eos=ASN1_check_infinite_end(&c->p,
 306                                 (long)(c->max-c->p));
 307                         if (c->eos) break;
 308                         }
 309                 else
 310                         {
 311                         if (c->slen <= 0) break;
 312                         }
 313
 314                 c->q=c->p;
 315                 if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
 316                         == NULL)
 317                         {
 318                         c->error=ERR_R_ASN1_LIB;
 319                         goto err;
 320                         }
 321
 322                 if (!BUF_MEM_grow(&b,num+os->length))
 323                         {
 324                         c->error=ERR_R_BUF_LIB;
 325                         goto err;
 326                         }
 327                 memcpy(&(b.data[num]),os->data,os->length);
 328                 if (!(c->inf & 1))
 329                         c->slen-=(c->p-c->q);
 330                 num+=os->length;
 331                 }
 332
 333         if (!asn1_Finish(c)) goto err;
 334
 335         a->length=num;
 336         if (a->data != NULL) Free(a->data);
 337         a->data=(unsigned char *)b.data;
 338         if (os != NULL) ASN1_STRING_free(os);
 339         return(1);
 340 err:
 341         ASN1err(ASN1_F_ASN1_COLLATE_PRIMATIVE,c->error);
 342         if (os != NULL) ASN1_STRING_free(os);
 343         if (b.data != NULL) Free(b.data);
 344         return(0);
 345         }
 346