/* tasn_utl.c *//* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL * project 2000. *//* ==================================================================== * Copyright (c) 2000 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 */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. */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. */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) 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);}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;	}}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;	}}int asn1_enc_save(ASN1_VALUE **pval, 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;}		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 */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. */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;}