/* tasn_utl.c */

 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL

  * project 2000.

  */

 /* ====================================================================

  * Copyright (c) 2000-2004 The OpenSSL Project.  All rights reserved.

  *

  * 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 above 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 acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

  *

  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

  *    endorse or promote products derived from this software without

  *    prior written permission. For written permission, please contact

  *    licensing@OpenSSL.org.

  *

  * 5. Products derived from this software may not be called "OpenSSL"

  *    nor may "OpenSSL" appear in their names without prior written

  *    permission of the OpenSSL Project.

  *

  * 6. Redistributions of any form whatsoever must retain the following

  *    acknowledgment:

  *    "This product includes software developed by the OpenSSL Project

  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

  *

  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

  * EXPRESSED 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 OpenSSL PROJECT OR

  * ITS 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.

  * ====================================================================

  *

  * This product includes cryptographic software written by Eric Young

  * (eay@cryptsoft.com).  This product includes software written by Tim

  * Hudson (tjh@cryptsoft.com).

  *

  */

 #include <stddef.h>

 #include <string.h>

 #include <openssl/asn1.h>

 #include <openssl/asn1t.h>

 #include <openssl/objects.h>

 #include <openssl/err.h>

 /* Utility functions for manipulating fields and offsets */

 /* Add 'offset' to 'addr' */

 #define offset2ptr(addr, offset) (void *)(((char *) addr) + offset)

 /* Given an ASN1_ITEM CHOICE type return

  * the selector value

  */

 EXPORT_C int asn1_get_choice_selector(ASN1_VALUE **pval, const ASN1_ITEM *it)

 	{

 	int *sel = offset2ptr(*pval, it->utype);

 	return *sel;

 	}

 /* Given an ASN1_ITEM CHOICE type set

  * the selector value, return old value.

  */

 EXPORT_C int asn1_set_choice_selector(ASN1_VALUE **pval, int value, const ASN1_ITEM *it)

 	{	

 	int *sel, ret;

 	sel = offset2ptr(*pval, it->utype);

 	ret = *sel;

 	*sel = value;

 	return ret;

 	}

 /* Do reference counting. The value 'op' decides what to do. 

  * if it is +1 then the count is incremented. If op is 0 count is

  * set to 1. If op is -1 count is decremented and the return value

  * is the current refrence count or 0 if no reference count exists.

  */

 EXPORT_C int asn1_do_lock(ASN1_VALUE **pval, int op, const ASN1_ITEM *it)

 	{

 	const ASN1_AUX *aux;

 	int *lck, ret;

 	if ((it->itype != ASN1_ITYPE_SEQUENCE)

 	   && (it->itype != ASN1_ITYPE_NDEF_SEQUENCE))

 		return 0;

 	aux = it->funcs;

 	if (!aux || !(aux->flags & ASN1_AFLG_REFCOUNT))

 		return 0;

 	lck = offset2ptr(*pval, aux->ref_offset);

 	if (op == 0)

 		{

 		*lck = 1;

 		return 1;

 		}

 	ret = CRYPTO_add(lck, op, aux->ref_lock);

 #ifdef REF_PRINT

 	fprintf(stderr, "%s: Reference Count: %d\n", it->sname, *lck);

 #endif

 #ifdef REF_CHECK

 	if (ret < 0) 

 		fprintf(stderr, "%s, bad reference count\n", it->sname);

 #endif

 	return ret;

 	}

 static ASN1_ENCODING *asn1_get_enc_ptr(ASN1_VALUE **pval, const ASN1_ITEM *it)

 	{

 	const ASN1_AUX *aux;

 	if (!pval || !*pval)

 		return NULL;

 	aux = it->funcs;

 	if (!aux || !(aux->flags & ASN1_AFLG_ENCODING))

 		return NULL;

 	return offset2ptr(*pval, aux->enc_offset);

 	}

 EXPORT_C void asn1_enc_init(ASN1_VALUE **pval, const ASN1_ITEM *it)

 	{

 	ASN1_ENCODING *enc;

 	enc = asn1_get_enc_ptr(pval, it);

 	if (enc)

 		{

 		enc->enc = NULL;

 		enc->len = 0;

 		enc->modified = 1;

 		}

 	}

 EXPORT_C void asn1_enc_free(ASN1_VALUE **pval, const ASN1_ITEM *it)

 	{

 	ASN1_ENCODING *enc;

 	enc = asn1_get_enc_ptr(pval, it);

 	if (enc)

 		{

 		if (enc->enc)

 			OPENSSL_free(enc->enc);

 		enc->enc = NULL;

 		enc->len = 0;

 		enc->modified = 1;

 		}

 	}

 EXPORT_C int asn1_enc_save(ASN1_VALUE **pval, const unsigned char *in, int inlen,

 							 const ASN1_ITEM *it)

 	{

 	ASN1_ENCODING *enc;

 	enc = asn1_get_enc_ptr(pval, it);

 	if (!enc)

 		return 1;

 	if (enc->enc)

 		OPENSSL_free(enc->enc);

 	enc->enc = OPENSSL_malloc(inlen);

 	if (!enc->enc)

 		return 0;

 	memcpy(enc->enc, in, inlen);

 	enc->len = inlen;

 	enc->modified = 0;

 	return 1;

 	}

 EXPORT_C int asn1_enc_restore(int *len, unsigned char **out, ASN1_VALUE **pval,

 							const ASN1_ITEM *it)

 	{

 	ASN1_ENCODING *enc;

 	enc = asn1_get_enc_ptr(pval, it);

 	if (!enc || enc->modified)

 		return 0;

 	if (out)

 		{

 		memcpy(*out, enc->enc, enc->len);

 		*out += enc->len;

 		}

 	if (len)

 		*len = enc->len;

 	return 1;

 	}

 /* Given an ASN1_TEMPLATE get a pointer to a field */

 EXPORT_C ASN1_VALUE ** asn1_get_field_ptr(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt)

 	{

 	ASN1_VALUE **pvaltmp;

 	if (tt->flags & ASN1_TFLG_COMBINE)

 		return pval;

 	pvaltmp = offset2ptr(*pval, tt->offset);

 	/* NOTE for BOOLEAN types the field is just a plain

  	 * int so we can't return int **, so settle for

 	 * (int *).

 	 */

 	return pvaltmp;

 	}

 /* Handle ANY DEFINED BY template, find the selector, look up

  * the relevant ASN1_TEMPLATE in the table and return it.

  */

 EXPORT_C const ASN1_TEMPLATE *asn1_do_adb(ASN1_VALUE **pval, const ASN1_TEMPLATE *tt,

 								int nullerr)

 	{

 	const ASN1_ADB *adb;

 	const ASN1_ADB_TABLE *atbl;

 	long selector;

 	ASN1_VALUE **sfld;

 	int i;

 	if (!(tt->flags & ASN1_TFLG_ADB_MASK))

 		return tt;

 	/* Else ANY DEFINED BY ... get the table */

 	adb = ASN1_ADB_ptr(tt->item);

 	/* Get the selector field */

 	sfld = offset2ptr(*pval, adb->offset);

 	/* Check if NULL */

 	if (!sfld)

 		{

 		if (!adb->null_tt)

 			goto err;

 		return adb->null_tt;

 		}

 	/* Convert type to a long:

 	 * NB: don't check for NID_undef here because it

 	 * might be a legitimate value in the table

 	 */

 	if (tt->flags & ASN1_TFLG_ADB_OID) 

 		selector = OBJ_obj2nid((ASN1_OBJECT *)*sfld);

 	else 

 		selector = ASN1_INTEGER_get((ASN1_INTEGER *)*sfld);

 	/* Try to find matching entry in table

 	 * Maybe should check application types first to

 	 * allow application override? Might also be useful

 	 * to have a flag which indicates table is sorted and

 	 * we can do a binary search. For now stick to a

 	 * linear search.

 	 */

 	for (atbl = adb->tbl, i = 0; i < adb->tblcount; i++, atbl++)

 		if (atbl->value == selector)

 			return &atbl->tt;

 	/* FIXME: need to search application table too */

 	/* No match, return default type */

 	if (!adb->default_tt)

 		goto err;		

 	return adb->default_tt;

 	err:

 	/* FIXME: should log the value or OID of unsupported type */

 	if (nullerr)

 		ASN1err(ASN1_F_ASN1_DO_ADB,

 			ASN1_R_UNSUPPORTED_ANY_DEFINED_BY_TYPE);

 	return NULL;

 	}