linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/* Decoder for ASN.1 BER/DER/CER encoded bytestream

 *

 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.

 * Written by David Howells (dhowells@redhat.com)

 */

​

#include <linux/export.h>

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/module.h>

#include <linux/asn1_decoder.h>

#include <linux/asn1_ber_bytecode.h>

​

static const unsigned char asn1_op_lengths[ASN1_OP__NR] = {

    /*                  OPC TAG JMP ACT */

    [ASN1_OP_MATCH]             = 1 + 1,

    [ASN1_OP_MATCH_OR_SKIP]         = 1 + 1,

    [ASN1_OP_MATCH_ACT]         = 1 + 1     + 1,

    [ASN1_OP_MATCH_ACT_OR_SKIP]     = 1 + 1     + 1,

    [ASN1_OP_MATCH_JUMP]            = 1 + 1 + 1,

    [ASN1_OP_MATCH_JUMP_OR_SKIP]        = 1 + 1 + 1,

    [ASN1_OP_MATCH_ANY]         = 1,

    [ASN1_OP_MATCH_ANY_OR_SKIP]     = 1,

    [ASN1_OP_MATCH_ANY_ACT]         = 1         + 1,

    [ASN1_OP_MATCH_ANY_ACT_OR_SKIP]     = 1         + 1,

    [ASN1_OP_COND_MATCH_OR_SKIP]        = 1 + 1,

    [ASN1_OP_COND_MATCH_ACT_OR_SKIP]    = 1 + 1     + 1,

    [ASN1_OP_COND_MATCH_JUMP_OR_SKIP]   = 1 + 1 + 1,

    [ASN1_OP_COND_MATCH_ANY]        = 1,

    [ASN1_OP_COND_MATCH_ANY_OR_SKIP]    = 1,

    [ASN1_OP_COND_MATCH_ANY_ACT]        = 1         + 1,

    [ASN1_OP_COND_MATCH_ANY_ACT_OR_SKIP]    = 1         + 1,

    [ASN1_OP_COND_FAIL]         = 1,

    [ASN1_OP_COMPLETE]          = 1,

    [ASN1_OP_ACT]               = 1         + 1,

    [ASN1_OP_MAYBE_ACT]         = 1         + 1,

    [ASN1_OP_RETURN]            = 1,

    [ASN1_OP_END_SEQ]           = 1,

    [ASN1_OP_END_SEQ_OF]            = 1     + 1,

    [ASN1_OP_END_SET]           = 1,

    [ASN1_OP_END_SET_OF]            = 1     + 1,

    [ASN1_OP_END_SEQ_ACT]           = 1         + 1,

    [ASN1_OP_END_SEQ_OF_ACT]        = 1     + 1 + 1,

    [ASN1_OP_END_SET_ACT]           = 1         + 1,

    [ASN1_OP_END_SET_OF_ACT]        = 1     + 1 + 1,

};

​

/*

 * Find the length of an indefinite length object

 * @data: The data buffer

 * @datalen: The end of the innermost containing element in the buffer

 * @_dp: The data parse cursor (updated before returning)

 * @_len: Where to return the size of the element.

 * @_errmsg: Where to return a pointer to an error message on error

 */

static int asn1_find_indefinite_length(const unsigned char *data, size_t datalen,

                       size_t *_dp, size_t *_len,

                       const char **_errmsg)

{

    unsigned char tag, tmp;

    size_t dp = *_dp, len, n;

    int indef_level = 1;