/* * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved. * * The contents of this file constitute Original Code as defined in and are * subject to the Apple Public Source License Version 1.2 (the 'License'). * You may not use this file except in compliance with the License. Please obtain * a copy of the License at http://www.apple.com/publicsource and read it before * using this file. * * This Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the * specific language governing rights and limitations under the License. */ /* * .../c-lib/src/asn-octs.c - BER encode, decode, print and free routines for the ASN.1 OCTET STRING type. * * MS 92 * Copyright (C) 1992 Michael Sample and the University of British Columbia * * This library is free software; you can redistribute it and/or * modify it provided that this copyright/license information is retained * in original form. * * If you modify this file, you must clearly indicate your changes. * * This source code is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * $Header: /cvs/Darwin/src/live/Security/SecuritySNACCRuntime/c-lib/src/asn-octs.c,v 1.1.1.1 2001/05/18 23:14:08 mb Exp $ * $Log: asn-octs.c,v $ * Revision 1.1.1.1 2001/05/18 23:14:08 mb * Move from private repository to open source repository * * Revision 1.2 2001/05/05 00:59:25 rmurphy * Adding darwin license headers * * Revision 1.1.1.1 1999/03/16 18:06:31 aram * Originals from SMIME Free Library. * * Revision 1.3 1995/07/27 09:00:32 rj * use memcmpeq that is defined in .../snacc.h to use either memcmp or bcmp. * * changed `_' to `-' in file names. * * Revision 1.2 1994/09/01 00:06:15 rj * reduce the risk of unwanted surprises with macro expansion by properly separating the C tokens. * * Revision 1.1 1994/08/28 09:45:58 rj * first check-in. for a list of changes to the snacc-1.1 distribution please refer to the ChangeLog. * */ #include <ctype.h> #include "asn-config.h" #include "asn-len.h" #include "asn-tag.h" #include "str-stk.h" #include "asn-bits.h" /* for TO_HEX macro */ #include "asn-octs.h" /* * encodes universal TAG LENGTH and Contents of and ASN.1 OCTET STRING */ AsnLen BEncAsnOcts PARAMS ((b, data), BUF_TYPE b _AND_ AsnOcts *data) { AsnLen len; len = BEncAsnOctsContent (b, data); len += BEncDefLen (b, len); len += BEncTag1 (b, UNIV, PRIM, OCTETSTRING_TAG_CODE); return len; } /* BEncAsnOcts */ /* * decodes universal TAG LENGTH and Contents of and ASN.1 OCTET STRING */ void BDecAsnOcts PARAMS ((b, result, bytesDecoded, env), BUF_TYPE b _AND_ AsnOcts *result _AND_ AsnLen *bytesDecoded _AND_ jmp_buf env) { AsnTag tag; AsnLen elmtLen; if (((tag = BDecTag (b, bytesDecoded, env)) != MAKE_TAG_ID (UNIV, PRIM, OCTETSTRING_TAG_CODE)) && (tag != MAKE_TAG_ID (UNIV, CONS, OCTETSTRING_TAG_CODE))) { Asn1Error ("BDecAsnOcts: ERROR - wrong tag on OCTET STRING.\n"); longjmp (env, -40); } elmtLen = BDecLen (b, bytesDecoded, env); BDecAsnOctsContent (b, tag, elmtLen, result, bytesDecoded, env); } /* BDecAsnOcts */ /* * BER encodes just the content of an OCTET STRING. */ AsnLen BEncAsnOctsContent PARAMS ((b, o), BUF_TYPE b _AND_ AsnOcts *o) { BufPutSegRvs (b, o->octs, o->octetLen); return o->octetLen; } /* BEncAsnOctsContent */ /* * Used for decoding constructed OCTET STRING values into * a contiguous local rep. * fills string stack with references to the pieces of a * construced octet string */ static void FillOctetStringStk PARAMS ((b, elmtLen0, bytesDecoded, env), BUF_TYPE b _AND_ AsnLen elmtLen0 _AND_ AsnLen *bytesDecoded _AND_ jmp_buf env) { unsigned long int refdLen; unsigned long int totalRefdLen; char *strPtr; unsigned long int totalElmtsLen1 = 0; unsigned long int tagId1; unsigned long int elmtLen1; for (; (totalElmtsLen1 < elmtLen0) || (elmtLen0 == INDEFINITE_LEN); ) { tagId1 = BDecTag (b, &totalElmtsLen1, env); if ((tagId1 == EOC_TAG_ID) && (elmtLen0 == INDEFINITE_LEN)) { BDEC_2ND_EOC_OCTET (b, &totalElmtsLen1, env); break; } elmtLen1 = BDecLen (b, &totalElmtsLen1, env); if (tagId1 == MAKE_TAG_ID (UNIV, PRIM, OCTETSTRING_TAG_CODE)) { /* * primitive part of string, put references to piece (s) in * str stack */ totalRefdLen = 0; refdLen = elmtLen1; while (1) { strPtr = BufGetSeg (b, &refdLen); PUSH_STR (strPtr, refdLen, env); totalRefdLen += refdLen; if (totalRefdLen == elmtLen1) break; /* exit this while loop */ if (refdLen == 0) /* end of data */ { Asn1Error ("BDecConsOctetString: ERROR - attempt to decode past end of data\n"); longjmp (env, -18); } refdLen = elmtLen1 - totalRefdLen; } totalElmtsLen1 += elmtLen1; } else if (tagId1 == MAKE_TAG_ID (UNIV, CONS, OCTETSTRING_TAG_CODE)) { /* * constructed octets string embedding in this constructed * octet string. decode it. */ FillOctetStringStk (b, elmtLen1, &totalElmtsLen1, env); } else /* wrong tag */ { Asn1Error ("BDecConsOctetString: ERROR - decoded non-OCTET STRING tag inside a constructed OCTET STRING\n"); longjmp (env, -19); } } /* end of for */ (*bytesDecoded) += totalElmtsLen1; } /* FillOctetStringStk */ /* * Decodes a seq of universally tagged octets strings until either EOC is * encountered or the given len is decoded. Merges them into a single * string. puts a NULL terminator on the string but does not include * this in the length. */ static void BDecConsAsnOcts PARAMS ((b, len, result, bytesDecoded, env), BUF_TYPE b _AND_ AsnLen len _AND_ AsnOcts *result _AND_ AsnLen *bytesDecoded _AND_ jmp_buf env) { char *bufCurr; unsigned long int curr; RESET_STR_STK(); /* * decode each piece of the octet string, puting * an entry in the octet string stack for each */ FillOctetStringStk (b, len, bytesDecoded, env); result->octetLen = strStkG.totalByteLen; /* alloc str for all octs pieces with extra byte for null terminator */ bufCurr = result->octs = Asn1Alloc (strStkG.totalByteLen +1); /* copy octet str pieces into single blk */ for (curr = 0; curr < strStkG.nextFreeElmt; curr++) { memcpy (bufCurr, strStkG.stk[curr].str, strStkG.stk[curr].len); bufCurr += strStkG.stk[curr].len; } /* add null terminator - this is not included in the str's len */ *bufCurr = '\0'; } /* BDecConsAsnOcts */ /* * Decodes the content of a BER OCTET STRING value */ void BDecAsnOctsContent PARAMS ((b, tagId, len, result, bytesDecoded, env), BUF_TYPE b _AND_ AsnTag tagId _AND_ AsnLen len _AND_ AsnOcts *result _AND_ AsnLen *bytesDecoded _AND_ jmp_buf env) { /* * tagId is encoded tag shifted into long int. * if CONS bit is set then constructed octet string */ if (TAG_IS_CONS (tagId)) BDecConsAsnOcts (b, len, result, bytesDecoded, env); else /* primitive octet string */ { result->octetLen = len; result->octs = Asn1Alloc (len+1); BufCopy (result->octs, b, len); if (BufReadError (b)) { Asn1Error ("BDecOctetString: ERROR - decoded past end of data\n"); longjmp (env, -20); } /* add null terminator - this is not included in the str's len */ result->octs[len] = '\0'; (*bytesDecoded) += len; } } /* BDecAsnOctsContent */ /* * Frees the string part of the given OCTET STRING */ void FreeAsnOcts PARAMS ((v), AsnOcts *v) { Asn1Free (v->octs); } /* FreeAsnOcts */ /* * Prints the given OCTET STRING value to the given FILE * in ASN.1 * Value Notation. Since the value notation uses the hard to read * hex format, the ASCII version is included in an ASN.1 comment. */ void PrintAsnOcts PARAMS ((f,v, indent), FILE *f _AND_ AsnOcts *v _AND_ unsigned short indent) { int i; /* print hstring value */ fprintf (f,"'"); for (i = 0; i < v->octetLen; i++) fprintf (f,"%c%c", TO_HEX (v->octs[i] >> 4), TO_HEX (v->octs[i])); fprintf (f,"'H"); /* show printable chars in comment */ fprintf (f," -- \""); for (i = 0; i < v->octetLen; i++) { if (isprint (v->octs[i])) fprintf (f,"%c", v->octs[i]); else fprintf (f,"."); } fprintf (f,"\" --"); } /* * Returns TRUE if the given OCTET STRING values are identical. * Returns FALSE otherwise. */ int AsnOctsEquiv PARAMS ((o1, o2), AsnOcts *o1 _AND_ AsnOcts *o2) { return o1->octetLen == o2->octetLen && !memcmpeq (o1->octs, o2->octs, o1->octetLen); } /* AsnOctsEquiv */