/* tasn_dec.c */

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

  * project 2000.

  */

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

  * Copyright (c) 2000-2005 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).

  *

  */

 /*

  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

  */

 #include <stddef.h>

 #include <string.h>

 #include <openssl/asn1.h>

 #include <openssl/asn1t.h>

 #include <openssl/objects.h>

 #include <openssl/buffer.h>

 #include <openssl/err.h>

 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

 #include "libcrypto_wsd_macros.h"

 #include "libcrypto_wsd.h"

 #endif

 static int asn1_check_eoc(const unsigned char **in, long len);

 static int asn1_find_end(const unsigned char **in, long len, char inf);

 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,

 				char inf, int tag, int aclass);

 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen);

 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,

 				char *inf, char *cst,

 				const unsigned char **in, long len,

 				int exptag, int expclass, char opt,

 				ASN1_TLC *ctx);

 static int asn1_template_ex_d2i(ASN1_VALUE **pval,

 				const unsigned char **in, long len,

 				const ASN1_TEMPLATE *tt, char opt,

 				ASN1_TLC *ctx);

 static int asn1_template_noexp_d2i(ASN1_VALUE **val,

 				const unsigned char **in, long len,

 				const ASN1_TEMPLATE *tt, char opt,

 				ASN1_TLC *ctx);

 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,

 				const unsigned char **in, long len,

 				const ASN1_ITEM *it,

 				int tag, int aclass, char opt, ASN1_TLC *ctx);

 /* Table to convert tags to bit values, used for MSTRING type */

 #ifndef EMULATOR

 static unsigned long tag2bit[32] = {

 0,	0,	0,	B_ASN1_BIT_STRING,	/* tags  0 -  3 */

 B_ASN1_OCTET_STRING,	0,	0,		B_ASN1_UNKNOWN,/* tags  4- 7 */

 B_ASN1_UNKNOWN,	B_ASN1_UNKNOWN,	B_ASN1_UNKNOWN,	B_ASN1_UNKNOWN,/* tags  8-11 */

 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */

 B_ASN1_SEQUENCE,0,B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */

 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,       /* tags 20-22 */

 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,			       /* tags 23-24 */	

 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,  /* tags 25-27 */

 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */

 	};

 #else

 static const unsigned long tag2bit[32] = {

 0,	0,	0,	B_ASN1_BIT_STRING,	/* tags  0 -  3 */

 B_ASN1_OCTET_STRING,	0,	0,		B_ASN1_UNKNOWN,/* tags  4- 7 */

 B_ASN1_UNKNOWN,	B_ASN1_UNKNOWN,	B_ASN1_UNKNOWN,	B_ASN1_UNKNOWN,/* tags  8-11 */

 B_ASN1_UTF8STRING,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,B_ASN1_UNKNOWN,/* tags 12-15 */

 B_ASN1_SEQUENCE,0,B_ASN1_NUMERICSTRING,B_ASN1_PRINTABLESTRING, /* tags 16-19 */

 B_ASN1_T61STRING,B_ASN1_VIDEOTEXSTRING,B_ASN1_IA5STRING,       /* tags 20-22 */

 B_ASN1_UTCTIME, B_ASN1_GENERALIZEDTIME,			       /* tags 23-24 */	

 B_ASN1_GRAPHICSTRING,B_ASN1_ISO64STRING,B_ASN1_GENERALSTRING,  /* tags 25-27 */

 B_ASN1_UNIVERSALSTRING,B_ASN1_UNKNOWN,B_ASN1_BMPSTRING,B_ASN1_UNKNOWN, /* tags 28-31 */

 	};

 #endif

 EXPORT_C unsigned long ASN1_tag2bit(int tag)

 	{

 	if ((tag < 0) || (tag > 30)) return 0;

 	return tag2bit[tag];

 	}

 /* Macro to initialize and invalidate the cache */

 #define asn1_tlc_clear(c)	if (c) (c)->valid = 0

 /* Decode an ASN1 item, this currently behaves just 

  * like a standard 'd2i' function. 'in' points to 

  * a buffer to read the data from, in future we will

  * have more advanced versions that can input data

  * a piece at a time and this will simply be a special

  * case.

  */

 EXPORT_C ASN1_VALUE *ASN1_item_d2i(ASN1_VALUE **pval,

 		const unsigned char **in, long len, const ASN1_ITEM *it)

 	{

 	ASN1_TLC c;

 	ASN1_VALUE *ptmpval = NULL;

 	if (!pval)

 		pval = &ptmpval;

 	c.valid = 0;

 	if (ASN1_item_ex_d2i(pval, in, len, it, -1, 0, 0, &c) > 0) 

 		return *pval;

 	return NULL;

 	}

 EXPORT_C int ASN1_template_d2i(ASN1_VALUE **pval,

 		const unsigned char **in, long len, const ASN1_TEMPLATE *tt)

 	{

 	ASN1_TLC c;

 	c.valid = 0;

 	return asn1_template_ex_d2i(pval, in, len, tt, 0, &c);

 	}

 /* Decode an item, taking care of IMPLICIT tagging, if any.

  * If 'opt' set and tag mismatch return -1 to handle OPTIONAL

  */

 EXPORT_C int ASN1_item_ex_d2i(ASN1_VALUE **pval, const unsigned char **in, long len,

 			const ASN1_ITEM *it,

 			int tag, int aclass, char opt, ASN1_TLC *ctx)

 	{

 	const ASN1_TEMPLATE *tt, *errtt = NULL;

 	const ASN1_COMPAT_FUNCS *cf;

 	const ASN1_EXTERN_FUNCS *ef;

 	const ASN1_AUX *aux = it->funcs;

 	ASN1_aux_cb *asn1_cb;

 	const unsigned char *p=NULL, *q;

 	unsigned char *wp=NULL;	/* BIG FAT WARNING!  BREAKS CONST WHERE USED */

 	unsigned char imphack = 0, oclass;

 	char seq_eoc, seq_nolen, cst, isopt;

 	long tmplen;

 	int i;

 	int otag;

 	int ret = 0;

 	ASN1_VALUE *pchval, **pchptr, *ptmpval;

 	if (!pval)

 		return 0;

 	if (aux && aux->asn1_cb)

 		asn1_cb = aux->asn1_cb;

 	else asn1_cb = 0;

 	switch(it->itype)

 		{

 		case ASN1_ITYPE_PRIMITIVE:

 		if (it->templates)

 			{

 			/* tagging or OPTIONAL is currently illegal on an item

 			 * template because the flags can't get passed down.

 			 * In practice this isn't a problem: we include the

 			 * relevant flags from the item template in the

 			 * template itself.

 			 */

 			if ((tag != -1) || opt)

 				{

 				ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 				ASN1_R_ILLEGAL_OPTIONS_ON_ITEM_TEMPLATE);

 				goto err;

 				}

 			return asn1_template_ex_d2i(pval, in, len,

 					it->templates, opt, ctx);

 		}

 		return asn1_d2i_ex_primitive(pval, in, len, it,

 						tag, aclass, opt, ctx);

 		break;

 		case ASN1_ITYPE_MSTRING:

 		p = *in;

 		/* Just read in tag and class */

 		ret = asn1_check_tlen(NULL, &otag, &oclass, NULL, NULL,

 						&p, len, -1, 0, 1, ctx);

 		if (!ret)

 			{

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 					ERR_R_NESTED_ASN1_ERROR);

 			goto err;

 			}

 		/* Must be UNIVERSAL class */

 		if (oclass != V_ASN1_UNIVERSAL)

 			{

 			/* If OPTIONAL, assume this is OK */

 			if (opt) return -1;

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 					ASN1_R_MSTRING_NOT_UNIVERSAL);

 			goto err;

 			}

 		/* Check tag matches bit map */

 		if (!(ASN1_tag2bit(otag) & it->utype))

 			{

 			/* If OPTIONAL, assume this is OK */

 			if (opt)

 				return -1;

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 					ASN1_R_MSTRING_WRONG_TAG);

 			goto err;

 			}

 		return asn1_d2i_ex_primitive(pval, in, len,

 						it, otag, 0, 0, ctx);

 		case ASN1_ITYPE_EXTERN:

 		/* Use new style d2i */

 		ef = it->funcs;

 		return ef->asn1_ex_d2i(pval, in, len,

 						it, tag, aclass, opt, ctx);

 		case ASN1_ITYPE_COMPAT:

 		/* we must resort to old style evil hackery */

 		cf = it->funcs;

 		/* If OPTIONAL see if it is there */

 		if (opt)

 			{

 			int exptag;

 			p = *in;

 			if (tag == -1)

 				exptag = it->utype;

 			else exptag = tag;

 			/* Don't care about anything other than presence

 			 * of expected tag */

 			ret = asn1_check_tlen(NULL, NULL, NULL, NULL, NULL,

 					&p, len, exptag, aclass, 1, ctx);

 			if (!ret)

 				{

 				ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 					ERR_R_NESTED_ASN1_ERROR);

 				goto err;

 				}

 			if (ret == -1)

 				return -1;

 			}

 		/* This is the old style evil hack IMPLICIT handling:

 		 * since the underlying code is expecting a tag and

 		 * class other than the one present we change the

 		 * buffer temporarily then change it back afterwards.

 		 * This doesn't and never did work for tags > 30.

 		 *

 		 * Yes this is *horrible* but it is only needed for

 		 * old style d2i which will hopefully not be around

 		 * for much longer.

 		 * FIXME: should copy the buffer then modify it so

 		 * the input buffer can be const: we should *always*

 		 * copy because the old style d2i might modify the

 		 * buffer.

 		 */

 		if (tag != -1)

 			{

 			wp = *(unsigned char **)in;

 			imphack = *wp;

 			if (p == NULL)

 				{

 				ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 					ERR_R_NESTED_ASN1_ERROR);

 				goto err;

 				}

 			*wp = (unsigned char)((*p & V_ASN1_CONSTRUCTED)

 								| it->utype);

 			}

 		ptmpval = cf->asn1_d2i(pval, in, len);

 		if (tag != -1)

 			*wp = imphack;

 		if (ptmpval)

 			return 1;

 		ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ERR_R_NESTED_ASN1_ERROR);

 		goto err;

 		case ASN1_ITYPE_CHOICE:

 		if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))

 				goto auxerr;

 		/* Allocate structure */

 		if (!*pval && !ASN1_item_ex_new(pval, it))

 			{

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 						ERR_R_NESTED_ASN1_ERROR);

 			goto err;

 			}

 		/* CHOICE type, try each possibility in turn */

 		pchval = NULL;

 		p = *in;

 		for (i = 0, tt=it->templates; i < it->tcount; i++, tt++)

 			{

 			pchptr = asn1_get_field_ptr(pval, tt);

 			/* We mark field as OPTIONAL so its absence

 			 * can be recognised.

 			 */

 			ret = asn1_template_ex_d2i(pchptr, &p, len, tt, 1, ctx);

 			/* If field not present, try the next one */

 			if (ret == -1)

 				continue;

 			/* If positive return, read OK, break loop */

 			if (ret > 0)

 				break;

 			/* Otherwise must be an ASN1 parsing error */

 			errtt = tt;

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 						ERR_R_NESTED_ASN1_ERROR);

 			goto err;

 			}

 		/* Did we fall off the end without reading anything? */

 		if (i == it->tcount)

 			{

 			/* If OPTIONAL, this is OK */

 			if (opt)

 				{

 				/* Free and zero it */

 				ASN1_item_ex_free(pval, it);

 				return -1;

 				}

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 					ASN1_R_NO_MATCHING_CHOICE_TYPE);

 			goto err;

 			}

 		asn1_set_choice_selector(pval, i, it);

 		*in = p;

 		if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))

 				goto auxerr;

 		return 1;

 		case ASN1_ITYPE_NDEF_SEQUENCE:

 		case ASN1_ITYPE_SEQUENCE:

 		p = *in;

 		tmplen = len;

 		/* If no IMPLICIT tagging set to SEQUENCE, UNIVERSAL */

 		if (tag == -1)

 			{

 			tag = V_ASN1_SEQUENCE;

 			aclass = V_ASN1_UNIVERSAL;

 			}

 		/* Get SEQUENCE length and update len, p */

 		ret = asn1_check_tlen(&len, NULL, NULL, &seq_eoc, &cst,

 					&p, len, tag, aclass, opt, ctx);

 		if (!ret)

 			{

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 					ERR_R_NESTED_ASN1_ERROR);

 			goto err;

 			}

 		else if (ret == -1)

 			return -1;

 		if (aux && (aux->flags & ASN1_AFLG_BROKEN))

 			{

 			len = tmplen - (p - *in);

 			seq_nolen = 1;

 			}

 		/* If indefinite we don't do a length check */

 		else seq_nolen = seq_eoc;

 		if (!cst)

 			{

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 				ASN1_R_SEQUENCE_NOT_CONSTRUCTED);

 			goto err;

 			}

 		if (!*pval && !ASN1_item_ex_new(pval, it))

 			{

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 				ERR_R_NESTED_ASN1_ERROR);

 			goto err;

 			}

 		if (asn1_cb && !asn1_cb(ASN1_OP_D2I_PRE, pval, it))

 				goto auxerr;

 		/* Get each field entry */

 		for (i = 0, tt = it->templates; i < it->tcount; i++, tt++)

 			{

 			const ASN1_TEMPLATE *seqtt;

 			ASN1_VALUE **pseqval;

 			seqtt = asn1_do_adb(pval, tt, 1);

 			if (!seqtt)

 				goto err;

 			pseqval = asn1_get_field_ptr(pval, seqtt);

 			/* Have we ran out of data? */

 			if (!len)

 				break;

 			q = p;

 			if (asn1_check_eoc(&p, len))

 				{

 				if (!seq_eoc)

 					{

 					ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 							ASN1_R_UNEXPECTED_EOC);

 					goto err;

 					}

 				len -= p - q;

 				seq_eoc = 0;

 				q = p;

 				break;

 				}

 			/* This determines the OPTIONAL flag value. The field

 			 * cannot be omitted if it is the last of a SEQUENCE

 			 * and there is still data to be read. This isn't

 			 * strictly necessary but it increases efficiency in

 			 * some cases.

 			 */

 			if (i == (it->tcount - 1))

 				isopt = 0;

 			else isopt = (char)(seqtt->flags & ASN1_TFLG_OPTIONAL);

 			/* attempt to read in field, allowing each to be

 			 * OPTIONAL */

 			ret = asn1_template_ex_d2i(pseqval, &p, len,

 							seqtt, isopt, ctx);

 			if (!ret)

 				{

 				errtt = seqtt;

 				goto err;

 				}

 			else if (ret == -1)

 				{

 				/* OPTIONAL component absent.

 				 * Free and zero the field.

 				 */

 				ASN1_template_free(pseqval, seqtt);

 				continue;

 				}

 			/* Update length */

 			len -= p - q;

 			}

 		/* Check for EOC if expecting one */

 		if (seq_eoc && !asn1_check_eoc(&p, len))

 			{

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_MISSING_EOC);

 			goto err;

 			}

 		/* Check all data read */

 		if (!seq_nolen && len)

 			{

 			ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 					ASN1_R_SEQUENCE_LENGTH_MISMATCH);

 			goto err;

 			}

 		/* If we get here we've got no more data in the SEQUENCE,

 		 * however we may not have read all fields so check all

 		 * remaining are OPTIONAL and clear any that are.

 		 */

 		for (; i < it->tcount; tt++, i++)

 			{

 			const ASN1_TEMPLATE *seqtt;

 			seqtt = asn1_do_adb(pval, tt, 1);

 			if (!seqtt)

 				goto err;

 			if (seqtt->flags & ASN1_TFLG_OPTIONAL)

 				{

 				ASN1_VALUE **pseqval;

 				pseqval = asn1_get_field_ptr(pval, seqtt);

 				ASN1_template_free(pseqval, seqtt);

 				}

 			else

 				{

 				errtt = seqtt;

 				ASN1err(ASN1_F_ASN1_ITEM_EX_D2I,

 							ASN1_R_FIELD_MISSING);

 				goto err;

 				}

 			}

 		/* Save encoding */

 		if (!asn1_enc_save(pval, *in, p - *in, it))

 			goto auxerr;

 		*in = p;

 		if (asn1_cb && !asn1_cb(ASN1_OP_D2I_POST, pval, it))

 				goto auxerr;

 		return 1;

 		default:

 		return 0;

 		}

 	auxerr:

 	ASN1err(ASN1_F_ASN1_ITEM_EX_D2I, ASN1_R_AUX_ERROR);

 	err:

 	ASN1_item_ex_free(pval, it);

 	if (errtt)

 		ERR_add_error_data(4, "Field=", errtt->field_name,

 					", Type=", it->sname);

 	else

 		ERR_add_error_data(2, "Type=", it->sname);

 	return 0;

 	}

 /* Templates are handled with two separate functions.

  * One handles any EXPLICIT tag and the other handles the rest.

  */

 static int asn1_template_ex_d2i(ASN1_VALUE **val,

 				const unsigned char **in, long inlen,

 				const ASN1_TEMPLATE *tt, char opt,

 							ASN1_TLC *ctx)

 	{

 	int flags, aclass;

 	int ret;

 	long len;

 	const unsigned char *p, *q;

 	char exp_eoc;

 	if (!val)

 		return 0;

 	flags = tt->flags;

 	aclass = flags & ASN1_TFLG_TAG_CLASS;

 	p = *in;

 	/* Check if EXPLICIT tag expected */

 	if (flags & ASN1_TFLG_EXPTAG)

 		{

 		char cst;

 		/* Need to work out amount of data available to the inner

 		 * content and where it starts: so read in EXPLICIT header to

 		 * get the info.

 		 */

 		ret = asn1_check_tlen(&len, NULL, NULL, &exp_eoc, &cst,

 					&p, inlen, tt->tag, aclass, opt, ctx);

 		q = p;

 		if (!ret)

 			{

 			ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,

 					ERR_R_NESTED_ASN1_ERROR);

 			return 0;

 			}

 		else if (ret == -1)

 			return -1;

 		if (!cst)

 			{

 			ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,

 					ASN1_R_EXPLICIT_TAG_NOT_CONSTRUCTED);

 			return 0;

 			}

 		/* We've found the field so it can't be OPTIONAL now */

 		ret = asn1_template_noexp_d2i(val, &p, len, tt, 0, ctx);

 		if (!ret)

 			{

 			ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,

 					ERR_R_NESTED_ASN1_ERROR);

 			return 0;

 			}

 		/* We read the field in OK so update length */

 		len -= p - q;

 		if (exp_eoc)

 			{

 			/* If NDEF we must have an EOC here */

 			if (!asn1_check_eoc(&p, len))

 				{

 				ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,

 						ASN1_R_MISSING_EOC);

 				goto err;

 				}

 			}

 		else

 			{

 			/* Otherwise we must hit the EXPLICIT tag end or its

 			 * an error */

 			if (len)

 				{

 				ASN1err(ASN1_F_ASN1_TEMPLATE_EX_D2I,

 					ASN1_R_EXPLICIT_LENGTH_MISMATCH);

 				goto err;

 				}

 			}

 		}

 		else 

 			return asn1_template_noexp_d2i(val, in, inlen,

 								tt, opt, ctx);

 	*in = p;

 	return 1;

 	err:

 	ASN1_template_free(val, tt);

 	*val = NULL;

 	return 0;

 	}

 static int asn1_template_noexp_d2i(ASN1_VALUE **val,

 				const unsigned char **in, long len,

 				const ASN1_TEMPLATE *tt, char opt,

 				ASN1_TLC *ctx)

 	{

 	int flags, aclass;

 	int ret;

 	const unsigned char *p, *q;

 	if (!val)

 		return 0;

 	flags = tt->flags;

 	aclass = flags & ASN1_TFLG_TAG_CLASS;

 	p = *in;

 	q = p;

 	if (flags & ASN1_TFLG_SK_MASK)

 		{

 		/* SET OF, SEQUENCE OF */

 		int sktag, skaclass;

 		char sk_eoc;

 		/* First work out expected inner tag value */

 		if (flags & ASN1_TFLG_IMPTAG)

 			{

 			sktag = tt->tag;

 			skaclass = aclass;

 			}

 		else

 			{

 			skaclass = V_ASN1_UNIVERSAL;

 			if (flags & ASN1_TFLG_SET_OF)

 				sktag = V_ASN1_SET;

 			else

 				sktag = V_ASN1_SEQUENCE;

 			}

 		/* Get the tag */

 		ret = asn1_check_tlen(&len, NULL, NULL, &sk_eoc, NULL,

 					&p, len, sktag, skaclass, opt, ctx);

 		if (!ret)

 			{

 			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,

 						ERR_R_NESTED_ASN1_ERROR);

 			return 0;

 			}

 		else if (ret == -1)

 			return -1;

 		if (!*val)

 			*val = (ASN1_VALUE *)sk_new_null();

 		else

 			{

 			/* We've got a valid STACK: free up any items present */

 			STACK *sktmp = (STACK *)*val;

 			ASN1_VALUE *vtmp;

 			while(sk_num(sktmp) > 0)

 				{

 				vtmp = (ASN1_VALUE *)sk_pop(sktmp);

 				ASN1_item_ex_free(&vtmp,

 						ASN1_ITEM_ptr(tt->item));

 				}

 			}

 		if (!*val)

 			{

 			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,

 						ERR_R_MALLOC_FAILURE);

 			goto err;

 			}

 		/* Read as many items as we can */

 		while(len > 0)

 			{

 			ASN1_VALUE *skfield;

 			q = p;

 			/* See if EOC found */

 			if (asn1_check_eoc(&p, len))

 				{

 				if (!sk_eoc)

 					{

 					ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,

 							ASN1_R_UNEXPECTED_EOC);

 					goto err;

 					}

 				len -= p - q;

 				sk_eoc = 0;

 				break;

 				}

 			skfield = NULL;

 			if (!ASN1_item_ex_d2i(&skfield, &p, len,

 						ASN1_ITEM_ptr(tt->item),

 						-1, 0, 0, ctx))

 				{

 				ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,

 					ERR_R_NESTED_ASN1_ERROR);

 				goto err;

 				}

 			len -= p - q;

 			if (!sk_push((STACK *)*val, (char *)skfield))

 				{

 				ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,

 						ERR_R_MALLOC_FAILURE);

 				goto err;

 				}

 			}

 		if (sk_eoc)

 			{

 			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I, ASN1_R_MISSING_EOC);

 			goto err;

 			}

 		}

 	else if (flags & ASN1_TFLG_IMPTAG)

 		{

 		/* IMPLICIT tagging */

 		ret = ASN1_item_ex_d2i(val, &p, len,

 			ASN1_ITEM_ptr(tt->item), tt->tag, aclass, opt, ctx);

 		if (!ret)

 			{

 			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,

 						ERR_R_NESTED_ASN1_ERROR);

 			goto err;

 			}

 		else if (ret == -1)

 			return -1;

 		}

 	else

 		{

 		/* Nothing special */

 		ret = ASN1_item_ex_d2i(val, &p, len, ASN1_ITEM_ptr(tt->item),

 							-1, 0, opt, ctx);

 		if (!ret)

 			{

 			ASN1err(ASN1_F_ASN1_TEMPLATE_NOEXP_D2I,

 					ERR_R_NESTED_ASN1_ERROR);

 			goto err;

 			}

 		else if (ret == -1)

 			return -1;

 		}

 	*in = p;

 	return 1;

 	err:

 	ASN1_template_free(val, tt);

 	*val = NULL;

 	return 0;

 	}

 static int asn1_d2i_ex_primitive(ASN1_VALUE **pval,

 				const unsigned char **in, long inlen, 

 				const ASN1_ITEM *it,

 				int tag, int aclass, char opt, ASN1_TLC *ctx)

 	{

 	int ret = 0, utype;

 	long plen;

 	char cst, inf, free_cont = 0;

 	const unsigned char *p;

 	BUF_MEM buf;

 	const unsigned char *cont = NULL;

 	long len; 

 	if (!pval)

 		{

 		ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ASN1_R_ILLEGAL_NULL);

 		return 0; /* Should never happen */

 		}

 	if (it->itype == ASN1_ITYPE_MSTRING)

 		{

 		utype = tag;

 		tag = -1;

 		}

 	else

 		utype = it->utype;

 	if (utype == V_ASN1_ANY)

 		{

 		/* If type is ANY need to figure out type from tag */

 		unsigned char oclass;

 		if (tag >= 0)

 			{

 			ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,

 					ASN1_R_ILLEGAL_TAGGED_ANY);

 			return 0;

 			}

 		if (opt)

 			{

 			ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,

 					ASN1_R_ILLEGAL_OPTIONAL_ANY);

 			return 0;

 			}

 		p = *in;

 		ret = asn1_check_tlen(NULL, &utype, &oclass, NULL, NULL,

 					&p, inlen, -1, 0, 0, ctx);

 		if (!ret)

 			{

 			ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,

 					ERR_R_NESTED_ASN1_ERROR);

 			return 0;

 			}

 		if (oclass != V_ASN1_UNIVERSAL)

 			utype = V_ASN1_OTHER;

 		}

 	if (tag == -1)

 		{

 		tag = utype;

 		aclass = V_ASN1_UNIVERSAL;

 		}

 	p = *in;

 	/* Check header */

 	ret = asn1_check_tlen(&plen, NULL, NULL, &inf, &cst,

 				&p, inlen, tag, aclass, opt, ctx);

 	if (!ret)

 		{

 		ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE, ERR_R_NESTED_ASN1_ERROR);

 		return 0;

 		}

 	else if (ret == -1)

 		return -1;

 		ret = 0;

 	/* SEQUENCE, SET and "OTHER" are left in encoded form */

 	if ((utype == V_ASN1_SEQUENCE)

 		|| (utype == V_ASN1_SET) || (utype == V_ASN1_OTHER))

 		{

 		/* Clear context cache for type OTHER because the auto clear

 		 * when we have a exact match wont work

 		 */

 		if (utype == V_ASN1_OTHER)

 			{

 			asn1_tlc_clear(ctx);

 			}

 		/* SEQUENCE and SET must be constructed */

 		else if (!cst)

 			{

 			ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,

 				ASN1_R_TYPE_NOT_CONSTRUCTED);

 			return 0;

 			}

 		cont = *in;

 		/* If indefinite length constructed find the real end */

 		if (inf)

 			{

 			if (!asn1_find_end(&p, plen, inf))

 				 goto err;

 			len = p - cont;

 			}

 		else

 			{

 			len = p - cont + plen;

 			p += plen;

 			buf.data = NULL;

 			}

 		}

 	else if (cst)

 		{

 		buf.length = 0;

 		buf.max = 0;

 		buf.data = NULL;

 		/* Should really check the internal tags are correct but

 		 * some things may get this wrong. The relevant specs

 		 * say that constructed string types should be OCTET STRINGs

 		 * internally irrespective of the type. So instead just check

 		 * for UNIVERSAL class and ignore the tag.

 		 */

 		if (!asn1_collect(&buf, &p, plen, inf, -1, V_ASN1_UNIVERSAL))

 		{

 			free_cont = 1;

 			goto err;

 		}	

 		len = buf.length;

 		/* Append a final null to string */

 		if (!BUF_MEM_grow_clean(&buf, len + 1))

 			{

 			ASN1err(ASN1_F_ASN1_D2I_EX_PRIMITIVE,

 						ERR_R_MALLOC_FAILURE);

 			return 0;

 			}

 		buf.data[len] = 0;

 		cont = (const unsigned char *)buf.data;

 		free_cont = 1;

 		}

 	else

 		{

 		cont = p;

 		len = plen;

 		p += plen;

 		}

 	/* We now have content length and type: translate into a structure */

 	if (!asn1_ex_c2i(pval, cont, len, utype, &free_cont, it))

 		goto err;

 	*in = p;

 	ret = 1;

 	err:

 	if (free_cont && buf.data) OPENSSL_free(buf.data);

 	return ret;

 	}

 /* Translate ASN1 content octets into a structure */

 EXPORT_C int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,

 			int utype, char *free_cont, const ASN1_ITEM *it)

 	{

 	ASN1_VALUE **opval = NULL;

 	ASN1_STRING *stmp;

 	ASN1_TYPE *typ = NULL;

 	int ret = 0;

 	const ASN1_PRIMITIVE_FUNCS *pf;

 	ASN1_INTEGER **tint;

 	pf = it->funcs;

 	if (pf && pf->prim_c2i)

 		return pf->prim_c2i(pval, cont, len, utype, free_cont, it);

 	/* If ANY type clear type and set pointer to internal value */

 	if (it->utype == V_ASN1_ANY)

 		{

 		if (!*pval)

 			{

 			typ = ASN1_TYPE_new();

 			if (typ == NULL)

 			goto err;

 			*pval = (ASN1_VALUE *)typ;

 			}

 		else

 			typ = (ASN1_TYPE *)*pval;

 		if (utype != typ->type)

 			ASN1_TYPE_set(typ, utype, NULL);

 		opval = pval;

 		pval = (ASN1_VALUE **)&typ->value.ptr;

 		}

 	switch(utype)

 		{

 		case V_ASN1_OBJECT:

 		if (!c2i_ASN1_OBJECT((ASN1_OBJECT **)pval, &cont, len))

 			goto err;

 		break;

 		case V_ASN1_NULL:

 		if (len)

 			{

 			ASN1err(ASN1_F_ASN1_EX_C2I,

 						ASN1_R_NULL_IS_WRONG_LENGTH);

 			goto err;

 			}

 		*pval = (ASN1_VALUE *)1;

 		break;

 		case V_ASN1_BOOLEAN:

 		if (len != 1)

 			{

 			ASN1err(ASN1_F_ASN1_EX_C2I,

 						ASN1_R_BOOLEAN_IS_WRONG_LENGTH);

 			goto err;

 			}

 		else

 			{

 			ASN1_BOOLEAN *tbool;

 			tbool = (ASN1_BOOLEAN *)pval;

 			*tbool = *cont;

 			}

 		break;

 		case V_ASN1_BIT_STRING:

 		if (!c2i_ASN1_BIT_STRING((ASN1_BIT_STRING **)pval, &cont, len))

 			goto err;

 		break;

 		case V_ASN1_INTEGER:

 		case V_ASN1_NEG_INTEGER:

 		case V_ASN1_ENUMERATED:

 		case V_ASN1_NEG_ENUMERATED:

 		tint = (ASN1_INTEGER **)pval;

 		if (!c2i_ASN1_INTEGER(tint, &cont, len))

 			goto err;

 		/* Fixup type to match the expected form */

 		(*tint)->type = utype | ((*tint)->type & V_ASN1_NEG);

 		break;

 		case V_ASN1_OCTET_STRING:

 		case V_ASN1_NUMERICSTRING:

 		case V_ASN1_PRINTABLESTRING:

 		case V_ASN1_T61STRING:

 		case V_ASN1_VIDEOTEXSTRING:

 		case V_ASN1_IA5STRING:

 		case V_ASN1_UTCTIME:

 		case V_ASN1_GENERALIZEDTIME:

 		case V_ASN1_GRAPHICSTRING:

 		case V_ASN1_VISIBLESTRING:

 		case V_ASN1_GENERALSTRING:

 		case V_ASN1_UNIVERSALSTRING:

 		case V_ASN1_BMPSTRING:

 		case V_ASN1_UTF8STRING:

 		case V_ASN1_OTHER:

 		case V_ASN1_SET:

 		case V_ASN1_SEQUENCE:

 		default:

 		/* All based on ASN1_STRING and handled the same */

 		if (!*pval)

 			{

 			stmp = ASN1_STRING_type_new(utype);

 			if (!stmp)

 				{

 				ASN1err(ASN1_F_ASN1_EX_C2I,

 							ERR_R_MALLOC_FAILURE);

 				goto err;

 				}

 			*pval = (ASN1_VALUE *)stmp;

 			}

 		else

 			{

 			stmp = (ASN1_STRING *)*pval;

 			stmp->type = utype;

 			}

 		/* If we've already allocated a buffer use it */

 		if (*free_cont)

 			{

 			if (stmp->data)

 				OPENSSL_free(stmp->data);

 			stmp->data = (unsigned char *)cont; /* UGLY CAST! RL */

 			stmp->length = len;

 			*free_cont = 0;

 			}

 		else

 			{

 			if (!ASN1_STRING_set(stmp, cont, len))

 				{

 				ASN1err(ASN1_F_ASN1_EX_C2I,

 							ERR_R_MALLOC_FAILURE);

 				ASN1_STRING_free(stmp);	

 				*pval = NULL;

 				goto err;

 				}

 			}

 		break;

 		}

 	/* If ASN1_ANY and NULL type fix up value */

 	if (typ && (utype == V_ASN1_NULL))

 		 typ->value.ptr = NULL;

 	ret = 1;

 	err:

 	if (!ret)

 		{

 		ASN1_TYPE_free(typ);

 		if (opval)

 			*opval = NULL;

 		}

 	return ret;

 	}

 /* This function finds the end of an ASN1 structure when passed its maximum

  * length, whether it is indefinite length and a pointer to the content.

  * This is more efficient than calling asn1_collect because it does not

  * recurse on each indefinite length header.

  */

 static int asn1_find_end(const unsigned char **in, long len, char inf)

 	{

 	int expected_eoc;

 	long plen;

 	const unsigned char *p = *in, *q;

 	/* If not indefinite length constructed just add length */

 	if (inf == 0)

 		{

 		*in += len;

 		return 1;

 		}

 	expected_eoc = 1;

 	/* Indefinite length constructed form. Find the end when enough EOCs

 	 * are found. If more indefinite length constructed headers

 	 * are encountered increment the expected eoc count otherwise just

 	 * skip to the end of the data.

 	 */

 	while (len > 0)

 		{

 		if(asn1_check_eoc(&p, len))

 			{

 			expected_eoc--;

 			if (expected_eoc == 0)

 				break;

 			len -= 2;

 			continue;

 			}

 		q = p;

 		/* Just read in a header: only care about the length */

 		if(!asn1_check_tlen(&plen, NULL, NULL, &inf, NULL, &p, len,

 				-1, 0, 0, NULL))

 			{

 			ASN1err(ASN1_F_ASN1_FIND_END, ERR_R_NESTED_ASN1_ERROR);

 			return 0;

 			}

 		if (inf)

 			expected_eoc++;

 		else

 			p += plen;

 		len -= p - q;

 		}

 	if (expected_eoc)

 		{

 		ASN1err(ASN1_F_ASN1_FIND_END, ASN1_R_MISSING_EOC);

 		return 0;

 		}

 	*in = p;

 	return 1;

 	}

 /* This function collects the asn1 data from a constructred string

  * type into a buffer. The values of 'in' and 'len' should refer

  * to the contents of the constructed type and 'inf' should be set

  * if it is indefinite length.

  */

 static int asn1_collect(BUF_MEM *buf, const unsigned char **in, long len,

 				char inf, int tag, int aclass)

 	{

 	const unsigned char *p, *q;

 	long plen;

 	char cst, ininf;

 	p = *in;

 	inf &= 1;

 	/* If no buffer and not indefinite length constructed just pass over

 	 * the encoded data */

 	if (!buf && !inf)

 		{

 		*in += len;

 		return 1;

 		}

 	while(len > 0)

 		{

 		q = p;

 		/* Check for EOC */

 		if (asn1_check_eoc(&p, len))

 			{

 			/* EOC is illegal outside indefinite length

 			 * constructed form */

 			if (!inf)

 				{

 				ASN1err(ASN1_F_ASN1_COLLECT,

 					ASN1_R_UNEXPECTED_EOC);

 				return 0;

 				}

 			inf = 0;

 			break;

 			}

 		if (!asn1_check_tlen(&plen, NULL, NULL, &ininf, &cst, &p,

 					len, tag, aclass, 0, NULL))

 			{

 			ASN1err(ASN1_F_ASN1_COLLECT, ERR_R_NESTED_ASN1_ERROR);

 			return 0;

 			}

 		/* If indefinite length constructed update max length */

 		if (cst)

 			{

 #ifdef OPENSSL_ALLOW_NESTED_ASN1_STRINGS

 			if (!asn1_collect(buf, &p, plen, ininf, tag, aclass))

 				return 0;

 #else

 			ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_NESTED_ASN1_STRING);

 			return 0;

 #endif

 			}

  		else if (plen && !collect_data(buf, &p, plen))

 		return 0;

 		len -= p - q;

 		}

 	if (inf)

 		{

 		ASN1err(ASN1_F_ASN1_COLLECT, ASN1_R_MISSING_EOC);

 		return 0;

 		}

 	*in = p;

 	return 1;

 	}

 static int collect_data(BUF_MEM *buf, const unsigned char **p, long plen)

 	{

 	int len;

 	if (buf)

 		{

 		len = buf->length;

 		if (!BUF_MEM_grow_clean(buf, len + plen))

 			{

 			ASN1err(ASN1_F_COLLECT_DATA, ERR_R_MALLOC_FAILURE);

 			return 0;

 			}

 		memcpy(buf->data + len, *p, plen);

 		}

 	*p += plen;

 	return 1;

 	}

 /* Check for ASN1 EOC and swallow it if found */

 static int asn1_check_eoc(const unsigned char **in, long len)

 	{

 	const unsigned char *p;

 	if (len < 2) return 0;

 	p = *in;

 	if (!p[0] && !p[1])

 		{

 		*in += 2;

 		return 1;

 		}

 	return 0;

 	}

 /* Check an ASN1 tag and length: a bit like ASN1_get_object

  * but it sets the length for indefinite length constructed

  * form, we don't know the exact length but we can set an

  * upper bound to the amount of data available minus the

  * header length just read.

  */

 static int asn1_check_tlen(long *olen, int *otag, unsigned char *oclass,

 				char *inf, char *cst,

 				const unsigned char **in, long len,

 				int exptag, int expclass, char opt,

 				ASN1_TLC *ctx)

 	{

 	int i;

 	int ptag, pclass;

 	long plen;

 	const unsigned char *p, *q;

 	p = *in;

 	q = p;

 	if (ctx && ctx->valid)

 		{

 		i = ctx->ret;

 		plen = ctx->plen;

 		pclass = ctx->pclass;

 		ptag = ctx->ptag;

 		p += ctx->hdrlen;

 		}

 	else

 		{

 		i = ASN1_get_object(&p, &plen, &ptag, &pclass, len);

 		if (ctx)

 			{

 			ctx->ret = i;

 			ctx->plen = plen;

 			ctx->pclass = pclass;

 			ctx->ptag = ptag;

 			ctx->hdrlen = p - q;

 			ctx->valid = 1;

 			/* If definite length, and no error, length +

 			 * header can't exceed total amount of data available. 

 			 */

 			if (!(i & 0x81) && ((plen + ctx->hdrlen) > len))

 				{

 				ASN1err(ASN1_F_ASN1_CHECK_TLEN,

 							ASN1_R_TOO_LONG);

 				asn1_tlc_clear(ctx);

 				return 0;

 				}

 			}

 		}

 	if (i & 0x80)

 		{

 		ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_BAD_OBJECT_HEADER);

 		asn1_tlc_clear(ctx);

 		return 0;

 		}

 	if (exptag >= 0)

 		{

 		if ((exptag != ptag) || (expclass != pclass))

 			{

 			/* If type is OPTIONAL, not an error:

 			 * indicate missing type.

 			 */

 			if (opt) return -1;

 			asn1_tlc_clear(ctx);

 			ASN1err(ASN1_F_ASN1_CHECK_TLEN, ASN1_R_WRONG_TAG);

 			return 0;

 			}

 		/* We have a tag and class match:

 		 * assume we are going to do something with it */

 		asn1_tlc_clear(ctx);

 		}

 	if (i & 1)

 		plen = len - (p - q);

 	if (inf)

 		*inf = i & 1;

 	if (cst)

 		*cst = i & V_ASN1_CONSTRUCTED;

 	if (olen)

 		*olen = plen;

 	if (oclass)

 		*oclass = pclass;

 	if (otag)

 		*otag = ptag;

 	*in = p;

 	return 1;

 	}