SecuritySNACCRuntime/c-lib/src/asn-octs.c

   1 /*
   2  * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /*
  20  * .../c-lib/src/asn-octs.c - BER encode, decode, print and free routines for the ASN.1 OCTET STRING type.
  21  *
  22  * MS 92
  23  * Copyright (C) 1992 Michael Sample and the University of British Columbia
  24  *
  25  * This library is free software; you can redistribute it and/or
  26  * modify it provided that this copyright/license information is retained
  27  * in original form.
  28  *
  29  * If you modify this file, you must clearly indicate your changes.
  30  *
  31  * This source code is distributed in the hope that it will be
  32  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  33  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  34  *
  35  * $Header: /cvs/Darwin/Security/SecuritySNACCRuntime/c-lib/src/asn-octs.c,v 1.1.1.1 2001/05/18 23:14:08 mb Exp $
  36  * $Log: asn-octs.c,v $
  37  * Revision 1.1.1.1  2001/05/18 23:14:08  mb
  38  * Move from private repository to open source repository
  39  *
  40  * Revision 1.2  2001/05/05 00:59:25  rmurphy
  41  * Adding darwin license headers
  42  *
  43  * Revision 1.1.1.1  1999/03/16 18:06:31  aram
  44  * Originals from SMIME Free Library.
  45  *
  46  * Revision 1.3  1995/07/27 09:00:32  rj
  47  * use memcmpeq that is defined in .../snacc.h to use either memcmp or bcmp.
  48  *
  49  * changed `_' to `-' in file names.
  50  *
  51  * Revision 1.2  1994/09/01  00:06:15  rj
  52  * reduce the risk of unwanted surprises with macro expansion by properly separating the C tokens.
  53  *
  54  * Revision 1.1  1994/08/28  09:45:58  rj
  55  * first check-in. for a list of changes to the snacc-1.1 distribution please refer to the ChangeLog.
  56  *
  57  */
  58
  59 #include <ctype.h>
  60
  61 #include "asn-config.h"
  62 #include "asn-len.h"
  63 #include "asn-tag.h"
  64 #include "str-stk.h"
  65 #include "asn-bits.h" /* for TO_HEX macro */
  66 #include "asn-octs.h"
  67
  68
  69 /*
  70  * encodes universal TAG LENGTH and Contents of and ASN.1 OCTET STRING
  71  */
  72 AsnLen
  73 BEncAsnOcts PARAMS ((b, data),
  74     BUF_TYPE     b _AND_
  75     AsnOcts *data)
  76 {
  77     AsnLen len;
  78
  79     len =  BEncAsnOctsContent (b, data);
  80     len += BEncDefLen (b, len);
  81     len += BEncTag1 (b, UNIV, PRIM, OCTETSTRING_TAG_CODE);
  82     return len;
  83 }  /* BEncAsnOcts */
  84
  85
  86 /*
  87  * decodes universal TAG LENGTH and Contents of and ASN.1 OCTET STRING
  88  */
  89 void
  90 BDecAsnOcts PARAMS ((b, result, bytesDecoded, env),
  91     BUF_TYPE   b _AND_
  92     AsnOcts    *result _AND_
  93     AsnLen *bytesDecoded _AND_
  94     jmp_buf env)
  95 {
  96     AsnTag tag;
  97     AsnLen elmtLen;
  98
  99     if (((tag = BDecTag (b, bytesDecoded, env)) != MAKE_TAG_ID (UNIV, PRIM, OCTETSTRING_TAG_CODE)) && (tag != MAKE_TAG_ID (UNIV, CONS, OCTETSTRING_TAG_CODE)))
 100     {
 101          Asn1Error ("BDecAsnOcts: ERROR - wrong tag on OCTET STRING.\n");
 102          longjmp (env, -40);
 103     }
 104
 105     elmtLen = BDecLen (b, bytesDecoded, env);
 106     BDecAsnOctsContent (b, tag, elmtLen, result, bytesDecoded, env);
 107
 108 }  /* BDecAsnOcts */
 109
 110 /*
 111  * BER encodes just the content of an OCTET STRING.
 112  */
 113 AsnLen
 114 BEncAsnOctsContent PARAMS ((b, o),
 115     BUF_TYPE b _AND_
 116     AsnOcts *o)
 117 {
 118     BufPutSegRvs (b, o->octs, o->octetLen);
 119     return o->octetLen;
 120 }  /* BEncAsnOctsContent */
 121
 122
 123
 124 /*
 125  * Used for decoding constructed OCTET STRING values into
 126  * a contiguous local rep.
 127  * fills string stack with references to the pieces of a
 128  * construced octet string
 129  */
 130 static void
 131 FillOctetStringStk PARAMS ((b, elmtLen0, bytesDecoded, env),
 132     BUF_TYPE b _AND_
 133     AsnLen elmtLen0 _AND_
 134     AsnLen *bytesDecoded _AND_
 135     jmp_buf env)
 136 {
 137     unsigned long int refdLen;
 138     unsigned long int totalRefdLen;
 139     char *strPtr;
 140     unsigned long int totalElmtsLen1 = 0;
 141     unsigned long int tagId1;
 142     unsigned long int elmtLen1;
 143
 144     for (; (totalElmtsLen1 < elmtLen0) || (elmtLen0 == INDEFINITE_LEN); )
 145     {
 146         tagId1 = BDecTag (b, &totalElmtsLen1, env);
 147
 148         if ((tagId1 == EOC_TAG_ID) && (elmtLen0 == INDEFINITE_LEN))
 149         {
 150             BDEC_2ND_EOC_OCTET (b, &totalElmtsLen1, env);
 151             break;
 152         }
 153
 154         elmtLen1 = BDecLen (b, &totalElmtsLen1, env);
 155         if (tagId1 == MAKE_TAG_ID (UNIV, PRIM, OCTETSTRING_TAG_CODE))
 156         {
 157             /*
 158              * primitive part of string, put references to piece (s) in
 159              * str stack
 160              */
 161             totalRefdLen = 0;
 162             refdLen = elmtLen1;
 163             while (1)
 164             {
 165                 strPtr = BufGetSeg (b, &refdLen);
 166
 167                 PUSH_STR (strPtr, refdLen, env);
 168                 totalRefdLen += refdLen;
 169                 if (totalRefdLen == elmtLen1)
 170                     break; /* exit this while loop */
 171
 172                 if (refdLen == 0) /* end of data */
 173                 {
 174                     Asn1Error ("BDecConsOctetString: ERROR - attempt to decode past end of data\n");
 175                     longjmp (env, -18);
 176                 }
 177                 refdLen = elmtLen1 - totalRefdLen;
 178             }
 179             totalElmtsLen1 += elmtLen1;
 180         }
 181
 182
 183         else if (tagId1 == MAKE_TAG_ID (UNIV, CONS, OCTETSTRING_TAG_CODE))
 184         {
 185             /*
 186              * constructed octets string embedding in this constructed
 187              * octet string. decode it.
 188              */
 189             FillOctetStringStk (b, elmtLen1, &totalElmtsLen1, env);
 190         }
 191         else  /* wrong tag */
 192         {
 193             Asn1Error ("BDecConsOctetString: ERROR - decoded non-OCTET STRING tag inside a constructed OCTET STRING\n");
 194             longjmp (env, -19);
 195         }
 196     } /* end of for */
 197
 198     (*bytesDecoded) += totalElmtsLen1;
 199
 200 }  /* FillOctetStringStk */
 201
 202
 203 /*
 204  * Decodes a seq of universally tagged octets strings until either EOC is
 205  * encountered or the given len is decoded.  Merges them into a single
 206  * string. puts a NULL terminator on the string but does not include
 207  * this in the length.
 208  */
 209 static void
 210 BDecConsAsnOcts PARAMS ((b, len, result, bytesDecoded, env),
 211     BUF_TYPE b _AND_
 212     AsnLen len _AND_
 213     AsnOcts *result _AND_
 214     AsnLen *bytesDecoded _AND_
 215     jmp_buf env)
 216 {
 217     char *bufCurr;
 218     unsigned long int curr;
 219
 220     RESET_STR_STK();
 221
 222     /*
 223      * decode each piece of the octet string, puting
 224      * an entry in the octet string stack for each
 225      */
 226     FillOctetStringStk (b, len, bytesDecoded, env);
 227
 228     result->octetLen = strStkG.totalByteLen;
 229
 230     /* alloc str for all octs pieces with extra byte for null terminator */
 231     bufCurr = result->octs = Asn1Alloc (strStkG.totalByteLen +1);
 232
 233     /* copy octet str pieces into single blk */
 234     for (curr = 0; curr < strStkG.nextFreeElmt; curr++)
 235     {
 236         memcpy (bufCurr, strStkG.stk[curr].str, strStkG.stk[curr].len);
 237         bufCurr += strStkG.stk[curr].len;
 238     }
 239
 240     /* add null terminator - this is not included in the str's len */
 241     *bufCurr = '\0';
 242
 243 }  /* BDecConsAsnOcts */
 244
 245 /*
 246  * Decodes the content of a BER OCTET STRING value
 247  */
 248 void
 249 BDecAsnOctsContent PARAMS ((b, tagId, len, result, bytesDecoded, env),
 250     BUF_TYPE b _AND_
 251     AsnTag tagId _AND_
 252     AsnLen len _AND_
 253     AsnOcts *result _AND_
 254     AsnLen *bytesDecoded _AND_
 255     jmp_buf env)
 256 {
 257     /*
 258      * tagId is encoded tag shifted into long int.
 259      * if CONS bit is set then constructed octet string
 260      */
 261     if (TAG_IS_CONS (tagId))
 262         BDecConsAsnOcts (b, len, result, bytesDecoded, env);
 263
 264     else /* primitive octet string */
 265     {
 266         result->octetLen = len;
 267         result->octs =  Asn1Alloc (len+1);
 268         BufCopy (result->octs, b, len);
 269
 270         if (BufReadError (b))
 271         {
 272             Asn1Error ("BDecOctetString: ERROR - decoded past end of data\n");
 273             longjmp (env, -20);
 274         }
 275
 276         /* add null terminator - this is not included in the str's len */
 277         result->octs[len] = '\0';
 278         (*bytesDecoded) += len;
 279     }
 280 }  /* BDecAsnOctsContent */
 281
 282
 283 /*
 284  * Frees the string part of the given OCTET STRING
 285  */
 286 void
 287 FreeAsnOcts PARAMS ((v),
 288     AsnOcts *v)
 289 {
 290     Asn1Free (v->octs);
 291 }  /* FreeAsnOcts */
 292
 293 /*
 294  * Prints the given OCTET STRING value to the given FILE * in ASN.1
 295  * Value Notation.  Since the value notation uses the hard to read
 296  * hex format, the ASCII version is included in an ASN.1 comment.
 297  */
 298 void
 299 PrintAsnOcts PARAMS ((f,v, indent),
 300     FILE *f _AND_
 301     AsnOcts *v _AND_
 302     unsigned short indent)
 303 {
 304     int i;
 305
 306     /* print hstring value */
 307     fprintf (f,"'");
 308
 309     for (i = 0; i < v->octetLen; i++)
 310           fprintf (f,"%c%c", TO_HEX (v->octs[i] >> 4), TO_HEX (v->octs[i]));
 311
 312     fprintf (f,"'H");
 313
 314     /* show printable chars in comment */
 315     fprintf (f,"  -- \"");
 316
 317     for (i = 0; i < v->octetLen; i++)
 318     {
 319         if (isprint (v->octs[i]))
 320             fprintf (f,"%c", v->octs[i]);
 321         else
 322           fprintf (f,".");
 323     }
 324     fprintf (f,"\" --");
 325 }
 326
 327
 328 /*
 329  * Returns TRUE if the given OCTET STRING values are identical.
 330  * Returns FALSE otherwise.
 331  */
 332 int
 333 AsnOctsEquiv PARAMS ((o1, o2),
 334     AsnOcts *o1 _AND_
 335     AsnOcts *o2)
 336 {
 337     return o1->octetLen == o2->octetLen && !memcmpeq (o1->octs, o2->octs, o1->octetLen);
 338 } /* AsnOctsEquiv */