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asn1_lib.c

/* crypto/asn1/asn1_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <limits.h>
#include "cryptlib.h"
#include <openssl/asn1.h>
#include <openssl/asn1_mac.h>

static int asn1_get_length(const unsigned char **pp,int *inf,long *rl,int max);
static void asn1_put_length(unsigned char **pp, int length);
const char *ASN1_version="ASN.1" OPENSSL_VERSION_PTEXT;

static int _asn1_check_infinite_end(const unsigned char **p, long len)
      {
      /* If there is 0 or 1 byte left, the length check should pick
       * things up */
      if (len <= 0)
            return(1);
      else if ((len >= 2) && ((*p)[0] == 0) && ((*p)[1] == 0))
            {
            (*p)+=2;
            return(1);
            }
      return(0);
      }

int ASN1_check_infinite_end(unsigned char **p, long len)
      {
      return _asn1_check_infinite_end((const unsigned char **)p, len);
      }

int ASN1_const_check_infinite_end(const unsigned char **p, long len)
      {
      return _asn1_check_infinite_end(p, len);
      }


int ASN1_get_object(const unsigned char **pp, long *plength, int *ptag,
      int *pclass, long omax)
      {
      int i,ret;
      long l;
      const unsigned char *p= *pp;
      int tag,xclass,inf;
      long max=omax;

      if (!max) goto err;
      ret=(*p&V_ASN1_CONSTRUCTED);
      xclass=(*p&V_ASN1_PRIVATE);
      i= *p&V_ASN1_PRIMITIVE_TAG;
      if (i == V_ASN1_PRIMITIVE_TAG)
            {           /* high-tag */
            p++;
            if (--max == 0) goto err;
            l=0;
            while (*p&0x80)
                  {
                  l<<=7L;
                  l|= *(p++)&0x7f;
                  if (--max == 0) goto err;
                  if (l > (INT_MAX >> 7L)) goto err;
                  }
            l<<=7L;
            l|= *(p++)&0x7f;
            tag=(int)l;
            if (--max == 0) goto err;
            }
      else
            { 
            tag=i;
            p++;
            if (--max == 0) goto err;
            }
      *ptag=tag;
      *pclass=xclass;
      if (!asn1_get_length(&p,&inf,plength,(int)max)) goto err;

#if 0
      fprintf(stderr,"p=%d + *plength=%ld > omax=%ld + *pp=%d  (%d > %d)\n", 
            (int)p,*plength,omax,(int)*pp,(int)(p+ *plength),
            (int)(omax+ *pp));

#endif
      if (*plength > (omax - (p - *pp)))
            {
            ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_TOO_LONG);
            /* Set this so that even if things are not long enough
             * the values are set correctly */
            ret|=0x80;
            }
      *pp=p;
      return(ret|inf);
err:
      ASN1err(ASN1_F_ASN1_GET_OBJECT,ASN1_R_HEADER_TOO_LONG);
      return(0x80);
      }

static int asn1_get_length(const unsigned char **pp, int *inf, long *rl, int max)
      {
      const unsigned char *p= *pp;
      unsigned long ret=0;
      unsigned int i;

      if (max-- < 1) return(0);
      if (*p == 0x80)
            {
            *inf=1;
            ret=0;
            p++;
            }
      else
            {
            *inf=0;
            i= *p&0x7f;
            if (*(p++) & 0x80)
                  {
                  if (i > sizeof(long))
                        return 0;
                  if (max-- == 0) return(0);
                  while (i-- > 0)
                        {
                        ret<<=8L;
                        ret|= *(p++);
                        if (max-- == 0) return(0);
                        }
                  }
            else
                  ret=i;
            }
      if (ret > LONG_MAX)
            return 0;
      *pp=p;
      *rl=(long)ret;
      return(1);
      }

/* class 0 is constructed
 * constructed == 2 for indefinite length constructed */
void ASN1_put_object(unsigned char **pp, int constructed, int length, int tag,
           int xclass)
      {
      unsigned char *p= *pp;
      int i, ttag;

      i=(constructed)?V_ASN1_CONSTRUCTED:0;
      i|=(xclass&V_ASN1_PRIVATE);
      if (tag < 31)
            *(p++)=i|(tag&V_ASN1_PRIMITIVE_TAG);
      else
            {
            *(p++)=i|V_ASN1_PRIMITIVE_TAG;
            for(i = 0, ttag = tag; ttag > 0; i++) ttag >>=7;
            ttag = i;
            while(i-- > 0)
                  {
                  p[i] = tag & 0x7f;
                  if(i != (ttag - 1)) p[i] |= 0x80;
                  tag >>= 7;
                  }
            p += ttag;
            }
      if (constructed == 2)
            *(p++)=0x80;
      else
            asn1_put_length(&p,length);
      *pp=p;
      }

int ASN1_put_eoc(unsigned char **pp)
      {
      unsigned char *p = *pp;
      *p++ = 0;
      *p++ = 0;
      *pp = p;
      return 2;
      }

static void asn1_put_length(unsigned char **pp, int length)
      {
      unsigned char *p= *pp;
      int i,l;
      if (length <= 127)
            *(p++)=(unsigned char)length;
      else
            {
            l=length;
            for (i=0; l > 0; i++)
                  l>>=8;
            *(p++)=i|0x80;
            l=i;
            while (i-- > 0)
                  {
                  p[i]=length&0xff;
                  length>>=8;
                  }
            p+=l;
            }
      *pp=p;
      }

int ASN1_object_size(int constructed, int length, int tag)
      {
      int ret;

      ret=length;
      ret++;
      if (tag >= 31)
            {
            while (tag > 0)
                  {
                  tag>>=7;
                  ret++;
                  }
            }
      if (constructed == 2)
            return ret + 3;
      ret++;
      if (length > 127)
            {
            while (length > 0)
                  {
                  length>>=8;
                  ret++;
                  }
            }
      return(ret);
      }

static int _asn1_Finish(ASN1_const_CTX *c)
      {
      if ((c->inf == (1|V_ASN1_CONSTRUCTED)) && (!c->eos))
            {
            if (!ASN1_const_check_infinite_end(&c->p,c->slen))
                  {
                  c->error=ERR_R_MISSING_ASN1_EOS;
                  return(0);
                  }
            }
      if (  ((c->slen != 0) && !(c->inf & 1)) ||
            ((c->slen < 0) && (c->inf & 1)))
            {
            c->error=ERR_R_ASN1_LENGTH_MISMATCH;
            return(0);
            }
      return(1);
      }

int asn1_Finish(ASN1_CTX *c)
      {
      return _asn1_Finish((ASN1_const_CTX *)c);
      }

int asn1_const_Finish(ASN1_const_CTX *c)
      {
      return _asn1_Finish(c);
      }

int asn1_GetSequence(ASN1_const_CTX *c, long *length)
      {
      const unsigned char *q;

      q=c->p;
      c->inf=ASN1_get_object(&(c->p),&(c->slen),&(c->tag),&(c->xclass),
            *length);
      if (c->inf & 0x80)
            {
            c->error=ERR_R_BAD_GET_ASN1_OBJECT_CALL;
            return(0);
            }
      if (c->tag != V_ASN1_SEQUENCE)
            {
            c->error=ERR_R_EXPECTING_AN_ASN1_SEQUENCE;
            return(0);
            }
      (*length)-=(c->p-q);
      if (c->max && (*length < 0))
            {
            c->error=ERR_R_ASN1_LENGTH_MISMATCH;
            return(0);
            }
      if (c->inf == (1|V_ASN1_CONSTRUCTED))
            c->slen= *length+ *(c->pp)-c->p;
      c->eos=0;
      return(1);
      }

ASN1_STRING *ASN1_STRING_dup(ASN1_STRING *str)
      {
      ASN1_STRING *ret;

      if (str == NULL) return(NULL);
      if ((ret=ASN1_STRING_type_new(str->type)) == NULL)
            return(NULL);
      if (!ASN1_STRING_set(ret,str->data,str->length))
            {
            ASN1_STRING_free(ret);
            return(NULL);
            }
      ret->flags = str->flags;
      return(ret);
      }

int ASN1_STRING_set(ASN1_STRING *str, const void *_data, int len)
      {
      unsigned char *c;
      const char *data=_data;

      if (len < 0)
            {
            if (data == NULL)
                  return(0);
            else
                  len=strlen(data);
            }
      if ((str->length < len) || (str->data == NULL))
            {
            c=str->data;
            if (c == NULL)
                  str->data=OPENSSL_malloc(len+1);
            else
                  str->data=OPENSSL_realloc(c,len+1);

            if (str->data == NULL)
                  {
                  ASN1err(ASN1_F_ASN1_STRING_SET,ERR_R_MALLOC_FAILURE);
                  str->data=c;
                  return(0);
                  }
            }
      str->length=len;
      if (data != NULL)
            {
            memcpy(str->data,data,len);
            /* an allowance for strings :-) */
            str->data[len]='\0';
            }
      return(1);
      }

ASN1_STRING *ASN1_STRING_new(void)
      {
      return(ASN1_STRING_type_new(V_ASN1_OCTET_STRING));
      }


ASN1_STRING *ASN1_STRING_type_new(int type)
      {
      ASN1_STRING *ret;

      ret=(ASN1_STRING *)OPENSSL_malloc(sizeof(ASN1_STRING));
      if (ret == NULL)
            {
            ASN1err(ASN1_F_ASN1_STRING_TYPE_NEW,ERR_R_MALLOC_FAILURE);
            return(NULL);
            }
      ret->length=0;
      ret->type=type;
      ret->data=NULL;
      ret->flags=0;
      return(ret);
      }

void ASN1_STRING_free(ASN1_STRING *a)
      {
      if (a == NULL) return;
      if (a->data != NULL) OPENSSL_free(a->data);
      OPENSSL_free(a);
      }

int ASN1_STRING_cmp(ASN1_STRING *a, ASN1_STRING *b)
      {
      int i;

      i=(a->length-b->length);
      if (i == 0)
            {
            i=memcmp(a->data,b->data,a->length);
            if (i == 0)
                  return(a->type-b->type);
            else
                  return(i);
            }
      else
            return(i);
      }

void asn1_add_error(const unsigned char *address, int offset)
      {
      char buf1[DECIMAL_SIZE(address)+1],buf2[DECIMAL_SIZE(offset)+1];

      BIO_snprintf(buf1,sizeof buf1,"%lu",(unsigned long)address);
      BIO_snprintf(buf2,sizeof buf2,"%d",offset);
      ERR_add_error_data(4,"address=",buf1," offset=",buf2);
      }

int ASN1_STRING_length(ASN1_STRING *x)
{ return M_ASN1_STRING_length(x); }

void ASN1_STRING_length_set(ASN1_STRING *x, int len)
{ M_ASN1_STRING_length_set(x, len); return; }

int ASN1_STRING_type(ASN1_STRING *x)
{ return M_ASN1_STRING_type(x); }

unsigned char * ASN1_STRING_data(ASN1_STRING *x)
{ return M_ASN1_STRING_data(x); }

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