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482 lines
11 KiB
482 lines
11 KiB
/* crypto/asn1/asn1_lib.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <limits.h>
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#include "cryptlib.h"
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#include <openssl/asn1.h>
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#include <openssl/asn1_mac.h>
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static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
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static void asn1_put_length(unsigned char **pp, int length);
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const char ASN1_version[]="ASN.1" OPENSSL_VERSION_PTEXT;
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static int _asn1_check_infinite_end(const unsigned char **p, long len)
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{
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/* If there is 0 or 1 byte left, the length check should pick
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* things up */
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if (len <= 0)
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return(1);
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else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
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{
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(*p)+=2;
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return(1);
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}
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return(0);
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}
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int ASN1_check_infinite_end(unsigned char **p, long len)
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{
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return _asn1_check_infinite_end((const unsigned char **)p, len);
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}
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int ASN1_const_check_infinite_end(const unsigned char **p, long len)
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{
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return _asn1_check_infinite_end(p, len);
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}
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int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
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int *pclass, long omax)
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{
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int i,ret;
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long l;
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const unsigned char *p= *pp;
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int tag,xclass,inf;
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long max=omax;
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if (!max) goto err;
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ret=(*p&V_ASN1_CONSTRUCTED);
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xclass=(*p&V_ASN1_PRIVATE);
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i= *p&V_ASN1_PRIMITIVE_TAG;
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if (i == V_ASN1_PRIMITIVE_TAG)
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{ /* high-tag */
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p++;
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if (--max == 0) goto err;
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l=0;
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while (*p&0x80)
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{
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l<<=7L;
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l|= *(p++)&0x7f;
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if (--max == 0) goto err;
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if (l > (INT_MAX >> 7L)) goto err;
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}
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l<<=7L;
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l|= *(p++)&0x7f;
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tag=(int)l;
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if (--max == 0) goto err;
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}
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else
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{
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tag=i;
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p++;
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if (--max == 0) goto err;
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}
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*ptag=tag;
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*pclass=xclass;
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if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;
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#if 0
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fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d (%d > %d)\n",
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(int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
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(int)(omax+ *pp));
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#endif
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if (*plength > (omax - (p - *pp)))
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{
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ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
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/* Set this so that even if things are not long enough
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* the values are set correctly */
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ret|=0x80;
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}
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*pp=p;
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return(ret|inf);
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err:
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ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
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return(0x80);
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}
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static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
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{
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const unsigned char *p= *pp;
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unsigned long ret=0;
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unsigned int i;
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if (max-- < 1) return(0);
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if (*p == 0x80)
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{
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*inf=1;
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ret=0;
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p++;
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}
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else
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{
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*inf=0;
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i= *p&0x7f;
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if (*(p++) & 0x80)
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{
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if (i > sizeof(long))
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return 0;
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if (max-- == 0) return(0);
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while (i-- > 0)
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{
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ret<<=8L;
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ret|= *(p++);
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if (max-- == 0) return(0);
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}
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}
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else
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ret=i;
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}
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if (ret > LONG_MAX)
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return 0;
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*pp=p;
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*rl=(long)ret;
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return(1);
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}
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/* class 0 is constructed
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* constructed == 2 for indefinite length constructed */
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void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
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int xclass)
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{
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unsigned char *p= *pp;
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int i, ttag;
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i=(constructed)?V_ASN1_CONSTRUCTED:0;
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i|=(xclass&V_ASN1_PRIVATE);
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if (tag < 31)
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*(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
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else
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{
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*(p++)=i|V_ASN1_PRIMITIVE_TAG;
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for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
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ttag = i;
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while(i-- > 0)
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{
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p[i] = tag & 0x7f;
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if(i != (ttag - 1)) p[i] |= 0x80;
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tag >>= 7;
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}
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p += ttag;
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}
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if (constructed == 2)
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*(p++)=0x80;
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else
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asn1_put_length(&p,length);
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*pp=p;
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}
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int ASN1_put_eoc(unsigned char **pp)
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{
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unsigned char *p = *pp;
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*p++ = 0;
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*p++ = 0;
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*pp = p;
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return 2;
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}
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static void asn1_put_length(unsigned char **pp, int length)
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{
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unsigned char *p= *pp;
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int i,l;
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if (length <= 127)
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*(p++)=(unsigned char)length;
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else
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{
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l=length;
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for (i=0; l > 0; i++)
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l>>=8;
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*(p++)=i|0x80;
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l=i;
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while (i-- > 0)
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{
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p[i]=length&0xff;
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length>>=8;
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}
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p+=l;
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}
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*pp=p;
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}
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int ASN1_object_size(int constructed, int length, int tag)
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{
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int ret;
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ret=length;
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ret++;
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if (tag >= 31)
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{
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while (tag > 0)
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{
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tag>>=7;
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ret++;
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}
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}
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if (constructed == 2)
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return ret + 3;
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ret++;
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if (length > 127)
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{
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while (length > 0)
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{
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length>>=8;
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ret++;
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}
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}
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return(ret);
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}
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static int _asn1_Finish(ASN1_const_CTX *c)
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{
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if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
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{
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if (!ASN1_const_check_infinite_end(&c->p,c->slen))
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{
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c->error=ERR_R_MISSING_ASN1_EOS;
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return(0);
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}
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}
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if ( ((c->slen != 0) && !(c->inf & 1)) ||
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((c->slen < 0) && (c->inf & 1)))
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{
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c->error=ERR_R_ASN1_LENGTH_MISMATCH;
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return(0);
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}
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return(1);
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}
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int asn1_Finish(ASN1_CTX *c)
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{
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return _asn1_Finish((ASN1_const_CTX *)c);
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}
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int asn1_const_Finish(ASN1_const_CTX *c)
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{
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return _asn1_Finish(c);
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}
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int asn1_GetSequence(ASN1_const_CTX *c, long *length)
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{
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const unsigned char *q;
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q=c->p;
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c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
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*length);
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if (c->inf & 0x80)
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{
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c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
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return(0);
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}
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if (c->tag != V_ASN1_SEQUENCE)
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{
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c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
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return(0);
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}
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(*length)-=(c->p-q);
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if (c->max && (*length < 0))
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{
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c->error=ERR_R_ASN1_LENGTH_MISMATCH;
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return(0);
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}
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if (c->inf == (1|V_ASN1_CONSTRUCTED))
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c->slen= *length+ *(c->pp)-c->p;
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c->eos=0;
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return(1);
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}
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int ASN1_STRING_copy(ASN1_STRING *dst, const ASN1_STRING *str)
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{
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if (str == NULL)
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return 0;
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dst->type = str->type;
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if (!ASN1_STRING_set(dst,str->data,str->length))
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return 0;
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dst->flags = str->flags;
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return 1;
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}
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ASN1_STRING *ASN1_STRING_dup(const ASN1_STRING *str)
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{
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ASN1_STRING *ret;
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if (!str)
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return NULL;
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ret=ASN1_STRING_new();
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if (!ret)
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return NULL;
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if (!ASN1_STRING_copy(ret,str))
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{
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ASN1_STRING_free(ret);
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return NULL;
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}
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return ret;
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}
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int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
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{
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unsigned char *c;
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const char *data=_data;
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if (len < 0)
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{
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if (data == NULL)
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return(0);
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else
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len=strlen(data);
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}
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if ((str->length < len) || (str->data == NULL))
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{
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c=str->data;
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if (c == NULL)
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str->data=OPENSSL_malloc(len+1);
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else
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str->data=OPENSSL_realloc(c,len+1);
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if (str->data == NULL)
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{
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ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
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str->data=c;
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return(0);
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}
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}
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str->length=len;
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if (data != NULL)
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{
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memcpy(str->data,data,len);
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/* an allowance for strings :-) */
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str->data[len]='\0';
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}
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return(1);
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}
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void ASN1_STRING_set0(ASN1_STRING *str, void *data, int len)
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{
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if (str->data)
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OPENSSL_free(str->data);
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str->data = data;
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str->length = len;
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}
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ASN1_STRING *ASN1_STRING_new(void)
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{
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return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
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}
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ASN1_STRING *ASN1_STRING_type_new(int type)
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{
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ASN1_STRING *ret;
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ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
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if (ret == NULL)
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{
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ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
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return(NULL);
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}
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ret->length=0;
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ret->type=type;
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ret->data=NULL;
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ret->flags=0;
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return(ret);
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}
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void ASN1_STRING_free(ASN1_STRING *a)
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{
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if (a == NULL) return;
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if (a->data && !(a->flags & ASN1_STRING_FLAG_NDEF))
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OPENSSL_free(a->data);
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OPENSSL_free(a);
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}
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int ASN1_STRING_cmp(const ASN1_STRING *a, const ASN1_STRING *b)
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{
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int i;
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i=(a->length-b->length);
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if (i == 0)
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{
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i=memcmp(a->data,b->data,a->length);
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if (i == 0)
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return(a->type-b->type);
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else
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return(i);
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}
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else
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return(i);
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}
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void asn1_add_error(const unsigned char *address, int offset)
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{
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char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];
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BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
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BIO_snprintf(buf2,sizeof buf2,"%d",offset);
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ERR_add_error_data(4,"address=",buf1," offset=",buf2);
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}
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int ASN1_STRING_length(const ASN1_STRING *x)
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{ return M_ASN1_STRING_length(x); }
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void ASN1_STRING_length_set(ASN1_STRING *x, int len)
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{ M_ASN1_STRING_length_set(x, len); return; }
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int ASN1_STRING_type(ASN1_STRING *x)
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{ return M_ASN1_STRING_type(x); }
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unsigned char * ASN1_STRING_data(ASN1_STRING *x)
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{ return M_ASN1_STRING_data(x); }
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