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DER: remove the C parser for DER

Browse Source
pull/4721/head
Pierre Chifflier 6 years ago
parent d92321d8b1
commit 1d9f37a60e
8 changed files with 1 additions and 1717 deletions
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1
configure.ac
Unescape Escape View File

@ -341,7 +341,6 @@
AC_DEFINE([AFLFUZZ_APPLAYER], [1], [Enable --afl-$proto-request commandline option])
AC_DEFINE([AFLFUZZ_MIME], [1], [Enable --afl-mime commandline option])
AC_DEFINE([AFLFUZZ_DECODER], [1], [Enable --afl-decoder-$proto commandline option])
AC_DEFINE([AFLFUZZ_DER], [1], [Enable --afl-der commandline option])
AC_DEFINE([AFLFUZZ_RULES], [1], [Enable --afl-rules commandline option])
# test for AFL PERSISTANT_MODE support

2
src/Makefile.am
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@ -444,8 +444,6 @@ util-daemon.c util-daemon.h \
util-debug.c util-debug.h \
util-debug-filters.c util-debug-filters.h \
util-decode-asn1.c util-decode-asn1.h \
util-decode-der.c util-decode-der.h \
util-decode-der-get.c util-decode-der-get.h \
util-decode-mime.c util-decode-mime.h \
util-detect.c util-detect.h \
util-device.c util-device.h \

34
src/app-layer-ssl.c
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@ -43,8 +43,6 @@
#include "conf.h"
#include "util-crypt.h"
#include "util-decode-der.h"
#include "util-decode-der-get.h"
#include "util-spm.h"
#include "util-unittest.h"
#include "util-debug.h"
@ -355,36 +353,6 @@ void SSLVersionToString(uint16_t version, char *buffer)
}
}
static void TlsDecodeHSCertificateErrSetEvent(SSLState *ssl_state, uint32_t err)
{
switch (err) {
case ERR_DER_UNKNOWN_ELEMENT:
SSLSetEvent(ssl_state,
TLS_DECODER_EVENT_CERTIFICATE_UNKNOWN_ELEMENT);
break;
case ERR_DER_ELEMENT_SIZE_TOO_BIG:
case ERR_DER_INVALID_SIZE:
case ERR_DER_RECURSION_LIMIT:
SSLSetEvent(ssl_state,
TLS_DECODER_EVENT_CERTIFICATE_INVALID_LENGTH);
break;
case ERR_DER_UNSUPPORTED_STRING:
SSLSetEvent(ssl_state,
TLS_DECODER_EVENT_CERTIFICATE_INVALID_STRING);
break;
case ERR_DER_MISSING_ELEMENT:
SSLSetEvent(ssl_state,
TLS_DECODER_EVENT_CERTIFICATE_MISSING_ELEMENT);
break;
case ERR_DER_INVALID_TAG:
case ERR_DER_INVALID_OBJECT:
case ERR_DER_GENERIC:
default:
SSLSetEvent(ssl_state, TLS_DECODER_EVENT_INVALID_CERTIFICATE);
break;
}
}
static inline int TlsDecodeHSCertificateFingerprint(SSLState *ssl_state,
const uint8_t *input,
uint32_t cert_len)
@ -464,7 +432,7 @@ static int TlsDecodeHSCertificate(SSLState *ssl_state,
x509 = rs_x509_decode(input, cert_len);
if (x509 == NULL) {
TlsDecodeHSCertificateErrSetEvent(ssl_state, ERR_DER_GENERIC);
SSLSetEvent(ssl_state, TLS_DECODER_EVENT_INVALID_CERTIFICATE);
goto next;
}

7
src/suricata.c
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@ -130,7 +130,6 @@
#include "app-layer-smb.h"
#include "app-layer-dcerpc.h"
#include "util-decode-der.h"
#include "util-ebpf.h"
#include "util-radix-tree.h"
#include "util-host-os-info.h"
@ -1403,12 +1402,6 @@ static void ParseCommandLineAFL(const char *opt_name, char *opt_arg)
else
exit(DecoderParseDataFromFileSerie(opt_arg, DecodeERSPAN));
} else
#endif
#ifdef AFLFUZZ_DER
if(strcmp(opt_name, "afl-der") == 0) {
//printf("arg: //%s\n", opt_arg);
exit(DerParseDataFromFile(opt_arg));
} else
#endif
{
abort();

441
src/util-decode-der-get.c
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@ -1,441 +0,0 @@
/*
* Copyright (C) 2011-2012 ANSSI
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
*/
/**
* \file
*
* \author Pierre Chifflier <pierre.chifflier@ssi.gouv.fr>
*
*/
#include "suricata-common.h"
#include "util-decode-der.h"
#include "util-decode-der-get.h"
static const uint8_t SEQ_IDX_SERIAL[] = { 0, 0 };
static const uint8_t SEQ_IDX_ISSUER[] = { 0, 2 };
static const uint8_t SEQ_IDX_VALIDITY[] = { 0, 3 };
static const uint8_t SEQ_IDX_SUBJECT[] = { 0, 4 };
static const char *Oid2ShortStr(const char *oid)
{
if (strcmp(oid, "1.2.840.113549.1.9.1") == 0)
return "emailAddress";
if (strcmp(oid, "2.5.4.3") == 0)
return "CN";
if (strcmp(oid, "2.5.4.5") == 0)
return "serialNumber";
if (strcmp(oid, "2.5.4.6") == 0)
return "C";
if (strcmp(oid, "2.5.4.7") == 0)
return "L";
if (strcmp(oid, "2.5.4.8") == 0)
return "ST";
if (strcmp(oid, "2.5.4.10") == 0)
return "O";
if (strcmp(oid, "2.5.4.11") == 0)
return "OU";
if (strcmp(oid, "0.9.2342.19200300.100.1.25") == 0)
return "DC";
return "unknown";
}
static time_t GentimeToTime(char *gentime)
{
time_t time;
struct tm tm;
/* GeneralizedTime values MUST be expressed in Greenwich Mean Time
* (Zulu) and MUST include seconds (rfc5280 4.1.2.5.2). It MUST NOT
* include fractional seconds. It should therefore be on the format
* YYYYmmddHHMMSSZ. */
if (strlen(gentime) != 15)
goto error;
memset(&tm, 0, sizeof(tm));
strptime(gentime, "%Y%m%d%H%M%SZ", &tm);
time = SCMkTimeUtc(&tm);
if (time < 0)
goto error;
return time;
error:
return -1;
}
static time_t UtctimeToTime(char *utctime)
{
time_t time;
unsigned int year;
char yy[3];
char buf[20];
/* UTCTime values MUST be expressed in Greenwich Mean Time (Zulu)
* and MUST include seconds (rfc5280 4.1.2.5.1). It should
* therefore be on the format YYmmddHHMMSSZ. */
if (strlen(utctime) != 13)
goto error;
/* UTCTime use two digits to represent the year. The year field (YY)
* should be interpreted as 19YY when it is greater than or equal to
* 50. If it is less than 50 it should be interpreted as 20YY.
* Because of this, GeneralizedTime must be used for dates in the
* year 2050 or later. */
strlcpy(yy, utctime, sizeof(yy));
year = strtol(yy, NULL, 10);
if (year >= 50)
snprintf(buf, sizeof(buf), "%i%s", 19, utctime);
else
snprintf(buf, sizeof(buf), "%i%s", 20, utctime);
time = GentimeToTime(buf);
if (time == -1)
goto error;
return time;
error:
return -1;
}
/**
* \brief Iterate through an ASN.1 structure, following the index sequence.
* Context specific elements are skipped.
*
* \retval The matching node, or NULL
*/
const Asn1Generic * Asn1DerGet(const Asn1Generic *top, const uint8_t *seq_index,
const uint32_t seqsz, uint32_t *errcode)
{
const Asn1Generic * node;
uint8_t idx, i;
uint8_t offset = 0;
if (errcode)
*errcode = ERR_DER_MISSING_ELEMENT;
node = top;
if (node == NULL || seq_index == NULL)
return NULL;
for (offset=0; offset<seqsz; offset++) {
idx = seq_index[offset];
for (i=0; i<idx; i++) {
if (node == NULL || node->data == NULL)
return NULL;
/* skip context-specific elements */
while (node->data->header.cls == ASN1_CLASS_CONTEXTSPEC) {
node = node->next;
if (node == NULL || node->data == NULL)
return NULL;
}
node = node->next;
if (node == NULL || node->data == NULL)
return NULL;
}
/* skip context-specific elements */
if (node == NULL || node->data == NULL)
return NULL;
while (node->data->header.cls == ASN1_CLASS_CONTEXTSPEC) {
node = node->next;
if (node == NULL || node->data == NULL)
return NULL;
}
node = node->data;
}
if (errcode)
*errcode = 0;
return node;
}
int Asn1DerGetValidity(const Asn1Generic *cert, time_t *not_before,
time_t *not_after, uint32_t *errcode)
{
const Asn1Generic *node, *it;
int rc = -1;
if (errcode)
*errcode = ERR_DER_MISSING_ELEMENT;
node = Asn1DerGet(cert, SEQ_IDX_VALIDITY, sizeof(SEQ_IDX_VALIDITY), errcode);
if ((node == NULL) || node->type != ASN1_SEQUENCE)
goto validity_error;
it = node->data;
if (it == NULL || it->str == NULL)
goto validity_error;
if (it->type == ASN1_UTCTIME)
*not_before = UtctimeToTime(it->str);
else if (it->type == ASN1_GENERALIZEDTIME)
*not_before = GentimeToTime(it->str);
else
goto validity_error;
if (*not_before == -1)
goto validity_error;
if (node->next == NULL)
goto validity_error;
it = node->next->data;
if (it == NULL || it->str == NULL)
goto validity_error;
if (it->type == ASN1_UTCTIME)
*not_after = UtctimeToTime(it->str);
else if (it->type == ASN1_GENERALIZEDTIME)
*not_after = GentimeToTime(it->str);
else
goto validity_error;
if (*not_after == -1)
goto validity_error;
rc = 0;
validity_error:
return rc;
}
int Asn1DerGetSerial(const Asn1Generic *cert, char *buffer, uint32_t length,
uint32_t *errcode)
{
const Asn1Generic *node;
uint32_t node_len, i;
int rc = -1;
if (errcode)
*errcode = ERR_DER_MISSING_ELEMENT;
buffer[0] = '\0';
node = Asn1DerGet(cert, SEQ_IDX_SERIAL, sizeof(SEQ_IDX_SERIAL), errcode);
if ((node == NULL) || node->type != ASN1_INTEGER || node->str == NULL)
goto serial_error;
node_len = strlen(node->str);
/* make sure the buffer is big enough */
if (node_len + (node_len / 2) > length)
goto serial_error;
/* format serial number (e.g. XX:XX:XX:XX:XX) */
for (i = 0; i < node_len; i++) {
char c[3];
/* insert separator before each even number */
if (((i % 2) == 0) && (i != 0)) {
snprintf(c, sizeof(c), ":%c", node->str[i]);
} else {
snprintf(c, sizeof(c), "%c", node->str[i]);
}
strlcat(buffer, c, length);
}
if (errcode)
*errcode = 0;
rc = 0;
serial_error:
return rc;
}
int Asn1DerGetIssuerDN(const Asn1Generic *cert, char *buffer, uint32_t length,
uint32_t *errcode)
{
const Asn1Generic *node_oid;
const Asn1Generic *node;
const Asn1Generic *it;
const Asn1Generic *node_set;
const Asn1Generic *node_str;
const char *shortname;
int rc = -1;
const char *separator = ", ";
if (errcode)
*errcode = ERR_DER_MISSING_ELEMENT;
if (length < 10)
goto issuer_dn_error;
buffer[0] = '\0';
node = Asn1DerGet(cert, SEQ_IDX_ISSUER, sizeof(SEQ_IDX_ISSUER), errcode);
if ((node == NULL) || node->type != ASN1_SEQUENCE)
goto issuer_dn_error;
it = node;
while (it != NULL) {
if (it->data == NULL)
goto issuer_dn_error;
node_set = it->data;
if (node_set->type != ASN1_SET || node_set->data == NULL)
goto issuer_dn_error;
node = node_set->data;
if (node->type != ASN1_SEQUENCE || node->data == NULL)
goto issuer_dn_error;
node_oid = node->data;
if (node_oid->str == NULL || node_oid->type != ASN1_OID)
goto issuer_dn_error;
shortname = Oid2ShortStr(node_oid->str);
if (node->next == NULL)
goto issuer_dn_error;
node = node->next;
node_str = node->data;
if (node_str == NULL || node_str->str == NULL)
goto issuer_dn_error;
switch (node_str->type) {
case ASN1_PRINTSTRING:
case ASN1_IA5STRING:
case ASN1_T61STRING:
case ASN1_UTF8STRING:
case ASN1_OCTETSTRING:
strlcat(buffer, shortname, length);
strlcat(buffer, "=", length);
strlcat(buffer, node_str->str, length);
break;
default:
if (errcode)
*errcode = ERR_DER_UNSUPPORTED_STRING;
goto issuer_dn_error;
}
if (strcmp(shortname,"CN") == 0)
separator = "/";
if (it->next != NULL)
strlcat(buffer, separator, length);
it = it->next;
}
if (errcode)
*errcode = 0;
rc = 0;
issuer_dn_error:
return rc;
}
int Asn1DerGetSubjectDN(const Asn1Generic *cert, char *buffer, uint32_t length,
uint32_t *errcode)
{
const Asn1Generic *node_oid;
const Asn1Generic *node;
const Asn1Generic *it;
const Asn1Generic *node_set;
const Asn1Generic *node_str;
const char *shortname;
int rc = -1;
const char *separator = ", ";
if (errcode)
*errcode = ERR_DER_MISSING_ELEMENT;
if (length < 10)
goto subject_dn_error;
buffer[0] = '\0';
node = Asn1DerGet(cert, SEQ_IDX_SUBJECT, sizeof(SEQ_IDX_SUBJECT), errcode);
if ((node == NULL) || node->type != ASN1_SEQUENCE)
goto subject_dn_error;
it = node;
while (it != NULL) {
if (it == NULL || it->data == NULL)
goto subject_dn_error;
node_set = it->data;
if (node_set->type != ASN1_SET || node_set->data == NULL)
goto subject_dn_error;
node = node_set->data;
if (node->type != ASN1_SEQUENCE || node->data == NULL)
goto subject_dn_error;
node_oid = node->data;
if (node_oid->str == NULL || node_oid->type != ASN1_OID)
goto subject_dn_error;
shortname = Oid2ShortStr(node_oid->str);
if (node->next == NULL)
goto subject_dn_error;
node = node->next;
node_str = node->data;
if (node_str == NULL || node_str->str == NULL)
goto subject_dn_error;
switch (node_str->type) {
case ASN1_PRINTSTRING:
case ASN1_IA5STRING:
case ASN1_T61STRING:
case ASN1_UTF8STRING:
case ASN1_OCTETSTRING:
strlcat(buffer, shortname, length);
strlcat(buffer, "=", length);
strlcat(buffer, node_str->str, length);
break;
default:
if (errcode)
*errcode = ERR_DER_UNSUPPORTED_STRING;
goto subject_dn_error;
}
if (strcmp(shortname,"CN") == 0)
separator = "/";
if (it->next != NULL)
strlcat(buffer, separator, length);
it = it->next;
}
if (errcode)
*errcode = 0;
rc = 0;
subject_dn_error:
return rc;
}

45
src/util-decode-der-get.h
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@ -1,45 +0,0 @@
/*
* Copyright (C) 2011-2012 ANSSI
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
*/
/**
* \file
*
* \author Pierre Chifflier <pierre.chifflier@ssi.gouv.fr>
*
*/
#ifndef __UTIL_DECODE_DER_GET_H__
#define __UTIL_DECODE_DER_GET_H__
const Asn1Generic * Asn1DerGet(const Asn1Generic *top, const uint8_t *seq_index, const uint32_t seqsz, uint32_t *errcode);
int Asn1DerGetIssuerDN(const Asn1Generic *cert, char *buffer, uint32_t length, uint32_t *errcode);
int Asn1DerGetSerial(const Asn1Generic *cert, char *buffer, uint32_t length, uint32_t *errcode);
int Asn1DerGetValidity(const Asn1Generic *cert, time_t *not_before, time_t *not_after, uint32_t *errcode);
int Asn1DerGetSubjectDN(const Asn1Generic *cert, char *buffer, uint32_t length, uint32_t *errcode);
#endif /* __UTIL_DECODE_DER_GET_H__ */

1081
src/util-decode-der.c
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107
src/util-decode-der.h
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@ -1,107 +0,0 @@
/*
* Copyright (C) 2011-2012 ANSSI
* 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. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS 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 AUTHOR 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.
*/
/**
* \file
*
* \author Pierre Chifflier <pierre.chifflier@ssi.gouv.fr>
*
*/
#ifndef __UTIL_DECODE_DER_H__
#define __UTIL_DECODE_DER_H__
#define ASN1_CLASS_UNIVERSAL 0
#define ASN1_CLASS_APPLICATION 1
#define ASN1_CLASS_CONTEXTSPEC 2
#define ASN1_CLASS_PRIVATE 3
#define ASN1_UNKNOWN 0
#define ASN1_BOOLEAN 0x01
#define ASN1_INTEGER 0x02
#define ASN1_BITSTRING 0x03
#define ASN1_OCTETSTRING 0x04
#define ASN1_NULL 0x05
#define ASN1_OID 0x06
#define ASN1_UTF8STRING 0x0c
#define ASN1_SEQUENCE 0x10
#define ASN1_SET 0x11
#define ASN1_PRINTSTRING 0x13
#define ASN1_T61STRING 0x14
#define ASN1_IA5STRING 0x16
#define ASN1_UTCTIME 0x17
#define ASN1_GENERALIZEDTIME 0x18
typedef struct Asn1ElementType_ {
uint8_t cls:2;
uint8_t pc:1;
uint8_t tag:5;
} __attribute__((packed)) Asn1ElementType;
/* Generic ASN.1 element
* Presence and meaning of fields depends on the header and type values.
*/
typedef struct Asn1Generic_ {
Asn1ElementType header;
uint8_t type;
uint32_t length; /* length of node, including header */
struct Asn1Generic_ *data; /* only if type is structured */
char *str;
uint32_t strlen;
uint64_t value;
struct Asn1Generic_ *next; /* only if type is sequence */
} Asn1Generic;
/* Generic error (failed allocation, etc.) */
#define ERR_DER_GENERIC 0x01
/* Unknown ASN.1 element type */
#define ERR_DER_UNKNOWN_ELEMENT 0x02
/* One element requires to read more bytes than available */
#define ERR_DER_ELEMENT_SIZE_TOO_BIG 0x03
/* One element size is invalid (e.g more than 4 bytes long) */
#define ERR_DER_INVALID_SIZE 0x04
/* Unsupported string type */
#define ERR_DER_UNSUPPORTED_STRING 0x05
/* Missing field or element */
#define ERR_DER_MISSING_ELEMENT 0x06
/* Generic error */
#define ERR_DER_RECURSION_LIMIT 0x07
/* Unexpected or unknown tag */
#define ERR_DER_INVALID_TAG 0x08
/* Invalid element: empty object, etc. */
#define ERR_DER_INVALID_OBJECT 0x09
Asn1Generic * DecodeDer(const unsigned char *buffer, uint32_t size, uint32_t *errcode) __attribute__((nonnull));
void DerFree(Asn1Generic *a);
#ifdef AFLFUZZ_DER
int DerParseDataFromFile(char *filename);
#endif
#endif /* __UTIL_DECODE_DER_H__ */
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