crypto/openssl-0.9.7e/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 <openssl/asn1.h>
  62
  63 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_CTX *c);
  64 /* type is a 'bitmap' of acceptable string types.
  65  */
  66 ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, unsigned char **pp,
  67              long length, int type)
  68         {
  69         ASN1_STRING *ret=NULL;
  70         unsigned char *p,*s;
  71         long len;
  72         int inf,tag,xclass;
  73         int i=0;
  74
  75         p= *pp;
  76         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
  77         if (inf & 0x80) goto err;
  78
  79         if (tag >= 32)
  80                 {
  81                 i=ASN1_R_TAG_VALUE_TOO_HIGH;;
  82                 goto err;
  83                 }
  84         if (!(ASN1_tag2bit(tag) & type))
  85                 {
  86                 i=ASN1_R_WRONG_TYPE;
  87                 goto err;
  88                 }
  89
  90         /* If a bit-string, exit early */
  91         if (tag == V_ASN1_BIT_STRING)
  92                 return(d2i_ASN1_BIT_STRING(a,pp,length));
  93
  94         if ((a == NULL) || ((*a) == NULL))
  95                 {
  96                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
  97                 }
  98         else
  99                 ret=(*a);
 100
 101         if (len != 0)
 102                 {
 103                 s=(unsigned char *)OPENSSL_malloc((int)len+1);
 104                 if (s == NULL)
 105                         {
 106                         i=ERR_R_MALLOC_FAILURE;
 107                         goto err;
 108                         }
 109                 memcpy(s,p,(int)len);
 110                 s[len]='\0';
 111                 p+=len;
 112                 }
 113         else
 114                 s=NULL;
 115
 116         if (ret->data != NULL) OPENSSL_free(ret->data);
 117         ret->length=(int)len;
 118         ret->data=s;
 119         ret->type=tag;
 120         if (a != NULL) (*a)=ret;
 121         *pp=p;
 122         return(ret);
 123 err:
 124         ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
 125         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 126                 ASN1_STRING_free(ret);
 127         return(NULL);
 128         }
 129
 130 int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
 131         {
 132         int ret,r,constructed;
 133         unsigned char *p;
 134
 135         if (a == NULL)  return(0);
 136
 137         if (tag == V_ASN1_BIT_STRING)
 138                 return(i2d_ASN1_BIT_STRING(a,pp));
 139
 140         ret=a->length;
 141         r=ASN1_object_size(0,ret,tag);
 142         if (pp == NULL) return(r);
 143         p= *pp;
 144
 145         if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
 146                 constructed=1;
 147         else
 148                 constructed=0;
 149         ASN1_put_object(&p,constructed,ret,tag,xclass);
 150         memcpy(p,a->data,a->length);
 151         p+=a->length;
 152         *pp= p;
 153         return(r);
 154         }
 155
 156 ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, unsigned char **pp, long length,
 157              int Ptag, int Pclass)
 158         {
 159         ASN1_STRING *ret=NULL;
 160         unsigned char *p,*s;
 161         long len;
 162         int inf,tag,xclass;
 163         int i=0;
 164
 165         if ((a == NULL) || ((*a) == NULL))
 166                 {
 167                 if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
 168                 }
 169         else
 170                 ret=(*a);
 171
 172         p= *pp;
 173         inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
 174         if (inf & 0x80)
 175                 {
 176                 i=ASN1_R_BAD_OBJECT_HEADER;
 177                 goto err;
 178                 }
 179
 180         if (tag != Ptag)
 181                 {
 182                 i=ASN1_R_WRONG_TAG;
 183                 goto err;
 184                 }
 185
 186         if (inf & V_ASN1_CONSTRUCTED)
 187                 {
 188                 ASN1_CTX c;
 189
 190                 c.pp=pp;
 191                 c.p=p;
 192                 c.inf=inf;
 193                 c.slen=len;
 194                 c.tag=Ptag;
 195                 c.xclass=Pclass;
 196                 c.max=(length == 0)?0:(p+length);
 197                 if (!asn1_collate_primitive(ret,&c))
 198                         goto err;
 199                 else
 200                         {
 201                         p=c.p;
 202                         }
 203                 }
 204         else
 205                 {
 206                 if (len != 0)
 207                         {
 208                         if ((ret->length < len) || (ret->data == NULL))
 209                                 {
 210                                 if (ret->data != NULL) OPENSSL_free(ret->data);
 211                                 s=(unsigned char *)OPENSSL_malloc((int)len + 1);
 212                                 if (s == NULL)
 213                                         {
 214                                         i=ERR_R_MALLOC_FAILURE;
 215                                         goto err;
 216                                         }
 217                                 }
 218                         else
 219                                 s=ret->data;
 220                         memcpy(s,p,(int)len);
 221                         s[len] = '\0';
 222                         p+=len;
 223                         }
 224                 else
 225                         {
 226                         s=NULL;
 227                         if (ret->data != NULL) OPENSSL_free(ret->data);
 228                         }
 229
 230                 ret->length=(int)len;
 231                 ret->data=s;
 232                 ret->type=Ptag;
 233                 }
 234
 235         if (a != NULL) (*a)=ret;
 236         *pp=p;
 237         return(ret);
 238 err:
 239         if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 240                 ASN1_STRING_free(ret);
 241         ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
 242         return(NULL);
 243         }
 244
 245
 246 /* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
 247  * them into the one structure that is then returned */
 248 /* There have been a few bug fixes for this function from
 249  * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
 250 static int asn1_collate_primitive(ASN1_STRING *a, ASN1_CTX *c)
 251         {
 252         ASN1_STRING *os=NULL;
 253         BUF_MEM b;
 254         int num;
 255
 256         b.length=0;
 257         b.max=0;
 258         b.data=NULL;
 259
 260         if (a == NULL)
 261                 {
 262                 c->error=ERR_R_PASSED_NULL_PARAMETER;
 263                 goto err;
 264                 }
 265
 266         num=0;
 267         for (;;)
 268                 {
 269                 if (c->inf & 1)
 270                         {
 271                         c->eos=ASN1_check_infinite_end(&c->p,
 272                                 (long)(c->max-c->p));
 273                         if (c->eos) break;
 274                         }
 275                 else
 276                         {
 277                         if (c->slen <= 0) break;
 278                         }
 279
 280                 c->q=c->p;
 281                 if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
 282                         == NULL)
 283                         {
 284                         c->error=ERR_R_ASN1_LIB;
 285                         goto err;
 286                         }
 287
 288                 if (!BUF_MEM_grow_clean(&b,num+os->length))
 289                         {
 290                         c->error=ERR_R_BUF_LIB;
 291                         goto err;
 292                         }
 293                 memcpy(&(b.data[num]),os->data,os->length);
 294                 if (!(c->inf & 1))
 295                         c->slen-=(c->p-c->q);
 296                 num+=os->length;
 297                 }
 298
 299         if (!asn1_Finish(c)) goto err;
 300
 301         a->length=num;
 302         if (a->data != NULL) OPENSSL_free(a->data);
 303         a->data=(unsigned char *)b.data;
 304         if (os != NULL) ASN1_STRING_free(os);
 305         return(1);
 306 err:
 307         ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);
 308         if (os != NULL) ASN1_STRING_free(os);
 309         if (b.data != NULL) OPENSSL_free(b.data);
 310         return(0);
 311         }
 312