/*
* Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#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>
#include "internal/numbers.h"
#include "asn1_local.h"
/*
* Constructed types with a recursive definition (such as can be found in PKCS7)
* could eventually exceed the stack given malicious input with excessive
* recursion. Therefore we limit the stack depth. This is the maximum number of
* recursive invocations of asn1_item_embed_d2i().
*/
#define ASN1_MAX_CONSTRUCTED_NEST 30
static int asn1_item_embed_d2i(ASN1_VALUE **pval, const unsigned char **in,
long len, const ASN1_ITEM *it,
int tag, int aclass, char opt, ASN1_TLC *ctx,
int depth);
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, int depth);
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, int depth);
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 depth);
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);
static int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
int utype, char *free_cont, const ASN1_ITEM *it);
/* Table to convert tags to bit values, used for MSTRING type */
static const unsigned long tag2bit[32] = {
/* tags 0 - 3 */
0, 0, 0