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a_bytes.c

/* crypto/asn1/a_bytes.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 "cryptlib.h"
#include <openssl/asn1.h>

static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c);
/* type is a 'bitmap' of acceptable string types.
 */
ASN1_STRING *d2i_ASN1_type_bytes(ASN1_STRING **a, const unsigned char **pp,
           long length, int type)
      {
      ASN1_STRING *ret=NULL;
      const unsigned char *p;
      unsigned char *s;
      long len;
      int inf,tag,xclass;
      int i=0;

      p= *pp;
      inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
      if (inf & 0x80) goto err;

      if (tag >= 32)
            {
            i=ASN1_R_TAG_VALUE_TOO_HIGH;;
            goto err;
            }
      if (!(ASN1_tag2bit(tag) & type))
            {
            i=ASN1_R_WRONG_TYPE;
            goto err;
            }

      /* If a bit-string, exit early */
      if (tag == V_ASN1_BIT_STRING)
            return(d2i_ASN1_BIT_STRING(a,pp,length));

      if ((a == NULL) || ((*a) == NULL))
            {
            if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
            }
      else
            ret=(*a);

      if (len != 0)
            {
            s=(unsigned char *)OPENSSL_malloc((int)len+1);
            if (s == NULL)
                  {
                  i=ERR_R_MALLOC_FAILURE;
                  goto err;
                  }
            memcpy(s,p,(int)len);
            s[len]='\0';
            p+=len;
            }
      else
            s=NULL;

      if (ret->data != NULL) OPENSSL_free(ret->data);
      ret->length=(int)len;
      ret->data=s;
      ret->type=tag;
      if (a != NULL) (*a)=ret;
      *pp=p;
      return(ret);
err:
      ASN1err(ASN1_F_D2I_ASN1_TYPE_BYTES,i);
      if ((ret != NULL) && ((a == NULL) || (*a != ret)))
            ASN1_STRING_free(ret);
      return(NULL);
      }

int i2d_ASN1_bytes(ASN1_STRING *a, unsigned char **pp, int tag, int xclass)
      {
      int ret,r,constructed;
      unsigned char *p;

      if (a == NULL)  return(0);

      if (tag == V_ASN1_BIT_STRING)
            return(i2d_ASN1_BIT_STRING(a,pp));
            
      ret=a->length;
      r=ASN1_object_size(0,ret,tag);
      if (pp == NULL) return(r);
      p= *pp;

      if ((tag == V_ASN1_SEQUENCE) || (tag == V_ASN1_SET))
            constructed=1;
      else
            constructed=0;
      ASN1_put_object(&p,constructed,ret,tag,xclass);
      memcpy(p,a->data,a->length);
      p+=a->length;
      *pp= p;
      return(r);
      }

ASN1_STRING *d2i_ASN1_bytes(ASN1_STRING **a, const unsigned char **pp,
           long length, int Ptag, int Pclass)
      {
      ASN1_STRING *ret=NULL;
      const unsigned char *p;
      unsigned char *s;
      long len;
      int inf,tag,xclass;
      int i=0;

      if ((a == NULL) || ((*a) == NULL))
            {
            if ((ret=ASN1_STRING_new()) == NULL) return(NULL);
            }
      else
            ret=(*a);

      p= *pp;
      inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
      if (inf & 0x80)
            {
            i=ASN1_R_BAD_OBJECT_HEADER;
            goto err;
            }

      if (tag != Ptag)
            {
            i=ASN1_R_WRONG_TAG;
            goto err;
            }

      if (inf & V_ASN1_CONSTRUCTED)
            {
            ASN1_const_CTX c;

            c.pp=pp;
            c.p=p;
            c.inf=inf;
            c.slen=len;
            c.tag=Ptag;
            c.xclass=Pclass;
            c.max=(length == 0)?0:(p+length);
            if (!asn1_collate_primitive(ret,&c)) 
                  goto err; 
            else
                  {
                  p=c.p;
                  }
            }
      else
            {
            if (len != 0)
                  {
                  if ((ret->length < len) || (ret->data == NULL))
                        {
                        if (ret->data != NULL) OPENSSL_free(ret->data);
                        s=(unsigned char *)OPENSSL_malloc((int)len + 1);
                        if (s == NULL)
                              {
                              i=ERR_R_MALLOC_FAILURE;
                              goto err;
                              }
                        }
                  else
                        s=ret->data;
                  memcpy(s,p,(int)len);
                  s[len] = '\0';
                  p+=len;
                  }
            else
                  {
                  s=NULL;
                  if (ret->data != NULL) OPENSSL_free(ret->data);
                  }

            ret->length=(int)len;
            ret->data=s;
            ret->type=Ptag;
            }

      if (a != NULL) (*a)=ret;
      *pp=p;
      return(ret);
err:
      if ((ret != NULL) && ((a == NULL) || (*a != ret)))
            ASN1_STRING_free(ret);
      ASN1err(ASN1_F_D2I_ASN1_BYTES,i);
      return(NULL);
      }


/* We are about to parse 0..n d2i_ASN1_bytes objects, we are to collapse
 * them into the one structure that is then returned */
/* There have been a few bug fixes for this function from
 * Paul Keogh <paul.keogh@sse.ie>, many thanks to him */
static int asn1_collate_primitive(ASN1_STRING *a, ASN1_const_CTX *c)
      {
      ASN1_STRING *os=NULL;
      BUF_MEM b;
      int num;

      b.length=0;
      b.max=0;
      b.data=NULL;

      if (a == NULL)
            {
            c->error=ERR_R_PASSED_NULL_PARAMETER;
            goto err;
            }

      num=0;
      for (;;)
            {
            if (c->inf & 1)
                  {
                  c->eos=ASN1_const_check_infinite_end(&c->p,
                        (long)(c->max-c->p));
                  if (c->eos) break;
                  }
            else
                  {
                  if (c->slen <= 0) break;
                  }

            c->q=c->p;
            if (d2i_ASN1_bytes(&os,&c->p,c->max-c->p,c->tag,c->xclass)
                  == NULL)
                  {
                  c->error=ERR_R_ASN1_LIB;
                  goto err;
                  }

            if (!BUF_MEM_grow_clean(&b,num+os->length))
                  {
                  c->error=ERR_R_BUF_LIB;
                  goto err;
                  }
            memcpy(&(b.data[num]),os->data,os->length);
            if (!(c->inf & 1))
                  c->slen-=(c->p-c->q);
            num+=os->length;
            }

      if (!asn1_const_Finish(c)) goto err;

      a->length=num;
      if (a->data != NULL) OPENSSL_free(a->data);
      a->data=(unsigned char *)b.data;
      if (os != NULL) ASN1_STRING_free(os);
      return(1);
err:
      ASN1err(ASN1_F_ASN1_COLLATE_PRIMITIVE,c->error);
      if (os != NULL) ASN1_STRING_free(os);
      if (b.data != NULL) OPENSSL_free(b.data);
      return(0);
      }


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