asn1write.h File Reference

ASN.1 buffer writing functionality. More...

#include "asn1.h"

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Macros
#define	MBEDTLS_ASN1_CHK_ADD(g, f)

Functions
int	mbedtls_asn1_write_len (unsigned char **p, unsigned char *start, size_t len)
	Write a length field in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_tag (unsigned char **p, unsigned char *start, unsigned char tag)
	Write a ASN.1 tag in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_raw_buffer (unsigned char **p, unsigned char *start, const unsigned char *buf, size_t size)
	Write raw buffer data Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_mpi (unsigned char **p, unsigned char *start, const mbedtls_mpi *X)
	Write a big number (MBEDTLS_ASN1_INTEGER) in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_null (unsigned char **p, unsigned char *start)
	Write a NULL tag (MBEDTLS_ASN1_NULL) with zero data in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_oid (unsigned char **p, unsigned char *start, const char *oid, size_t oid_len)
	Write an OID tag (MBEDTLS_ASN1_OID) and data in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_algorithm_identifier (unsigned char **p, unsigned char *start, const char *oid, size_t oid_len, size_t par_len)
	Write an AlgorithmIdentifier sequence in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_bool (unsigned char **p, unsigned char *start, int boolean)
	Write a boolean tag (MBEDTLS_ASN1_BOOLEAN) and value in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_int (unsigned char **p, unsigned char *start, int val)
	Write an int tag (MBEDTLS_ASN1_INTEGER) and value in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_printable_string (unsigned char **p, unsigned char *start, const char *text, size_t text_len)
	Write a printable string tag (MBEDTLS_ASN1_PRINTABLE_STRING) and value in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_ia5_string (unsigned char **p, unsigned char *start, const char *text, size_t text_len)
	Write an IA5 string tag (MBEDTLS_ASN1_IA5_STRING) and value in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_bitstring (unsigned char **p, unsigned char *start, const unsigned char *buf, size_t bits)
	Write a bitstring tag (MBEDTLS_ASN1_BIT_STRING) and value in ASN.1 format Note: function works backwards in data buffer. More...
int	mbedtls_asn1_write_octet_string (unsigned char **p, unsigned char *start, const unsigned char *buf, size_t size)
	Write an octet string tag (MBEDTLS_ASN1_OCTET_STRING) and value in ASN.1 format Note: function works backwards in data buffer. More...
mbedtls_asn1_named_data *	mbedtls_asn1_store_named_data (mbedtls_asn1_named_data **list, const char *oid, size_t oid_len, const unsigned char *val, size_t val_len)
	Create or find a specific named_data entry for writing in a sequence or list based on the OID. If not already in there, a new entry is added to the head of the list. Warning: Destructive behaviour for the val data! More...

Detailed Description

ASN.1 buffer writing functionality.

Copyright (C) 2006-2015, ARM Limited, All Rights Reserved SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

This file is part of mbed TLS (https://tls.mbed.org)

Macro Definition Documentation

MBEDTLS_ASN1_CHK_ADD

#define MBEDTLS_ASN1_CHK_ADD	(		g,
			f
	)

Value:

do { if( ( ret = f ) < 0 ) return( ret ); else \
 g += ret; } while( 0 )

Function Documentation

mbedtls_asn1_store_named_data()

mbedtls_asn1_named_data* mbedtls_asn1_store_named_data	(	mbedtls_asn1_named_data **	list,
		const char *	oid,
		size_t	oid_len,
		const unsigned char *	val,
		size_t	val_len
	)

Create or find a specific named_data entry for writing in a sequence or list based on the OID. If not already in there, a new entry is added to the head of the list. Warning: Destructive behaviour for the val data!

Parameters

list	Pointer to the location of the head of the list to seek through (will be updated in case of a new entry)
oid	The OID to look for
oid_len	Size of the OID
val	Data to store (can be NULL if you want to fill it by hand)
val_len	Minimum length of the data buffer needed

Returns

NULL if if there was a memory allocation error, or a pointer to the new / existing entry.

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mbedtls_asn1_write_algorithm_identifier()

int mbedtls_asn1_write_algorithm_identifier	(	unsigned char **	p,
		unsigned char *	start,
		const char *	oid,
		size_t	oid_len,
		size_t	par_len
	)

Write an AlgorithmIdentifier sequence in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
oid	the OID of the algorithm
oid_len	length of the OID
par_len	length of parameters, which must be already written. If 0, NULL parameters are added

Returns

the length written or a negative error code

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mbedtls_asn1_write_bitstring()

int mbedtls_asn1_write_bitstring	(	unsigned char **	p,
		unsigned char *	start,
		const unsigned char *	buf,
		size_t	bits
	)

Write a bitstring tag (MBEDTLS_ASN1_BIT_STRING) and value in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
buf	the bitstring
bits	the total number of bits in the bitstring

Returns

the length written or a negative error code

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mbedtls_asn1_write_bool()

int mbedtls_asn1_write_bool	(	unsigned char **	p,
		unsigned char *	start,
		int	boolean
	)

Write a boolean tag (MBEDTLS_ASN1_BOOLEAN) and value in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
boolean	0 or 1

Returns

the length written or a negative error code

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mbedtls_asn1_write_ia5_string()

int mbedtls_asn1_write_ia5_string	(	unsigned char **	p,
		unsigned char *	start,
		const char *	text,
		size_t	text_len
	)

Write an IA5 string tag (MBEDTLS_ASN1_IA5_STRING) and value in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
text	the text to write
text_len	length of the text

Returns

the length written or a negative error code

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mbedtls_asn1_write_int()

int mbedtls_asn1_write_int	(	unsigned char **	p,
		unsigned char *	start,
		int	val
	)

Write an int tag (MBEDTLS_ASN1_INTEGER) and value in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
val	the integer value

Returns

the length written or a negative error code

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mbedtls_asn1_write_len()

int mbedtls_asn1_write_len	(	unsigned char **	p,
		unsigned char *	start,
		size_t	len
	)

Write a length field in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
len	the length to write

Returns

the length written or a negative error code

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mbedtls_asn1_write_mpi()

int mbedtls_asn1_write_mpi	(	unsigned char **	p,
		unsigned char *	start,
		const mbedtls_mpi *	X
	)

Write a big number (MBEDTLS_ASN1_INTEGER) in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
X	the MPI to write

Returns

the length written or a negative error code

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mbedtls_asn1_write_null()

int mbedtls_asn1_write_null	(	unsigned char **	p,
		unsigned char *	start
	)

Write a NULL tag (MBEDTLS_ASN1_NULL) with zero data in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)

Returns

the length written or a negative error code

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mbedtls_asn1_write_octet_string()

int mbedtls_asn1_write_octet_string	(	unsigned char **	p,
		unsigned char *	start,
		const unsigned char *	buf,
		size_t	size
	)

Write an octet string tag (MBEDTLS_ASN1_OCTET_STRING) and value in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
buf	data buffer to write
size	length of the data buffer

Returns

the length written or a negative error code

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mbedtls_asn1_write_oid()

int mbedtls_asn1_write_oid	(	unsigned char **	p,
		unsigned char *	start,
		const char *	oid,
		size_t	oid_len
	)

Write an OID tag (MBEDTLS_ASN1_OID) and data in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
oid	the OID to write
oid_len	length of the OID

Returns

the length written or a negative error code

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mbedtls_asn1_write_printable_string()

int mbedtls_asn1_write_printable_string	(	unsigned char **	p,
		unsigned char *	start,
		const char *	text,
		size_t	text_len
	)

Write a printable string tag (MBEDTLS_ASN1_PRINTABLE_STRING) and value in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
text	the text to write
text_len	length of the text

Returns

the length written or a negative error code

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mbedtls_asn1_write_raw_buffer()

int mbedtls_asn1_write_raw_buffer	(	unsigned char **	p,
		unsigned char *	start,
		const unsigned char *	buf,
		size_t	size
	)

Write raw buffer data Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
buf	data buffer to write
size	length of the data buffer

Returns

the length written or a negative error code

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mbedtls_asn1_write_tag()

int mbedtls_asn1_write_tag	(	unsigned char **	p,
		unsigned char *	start,
		unsigned char	tag
	)

Write a ASN.1 tag in ASN.1 format Note: function works backwards in data buffer.

Parameters

p	reference to current position pointer
start	start of the buffer (for bounds-checking)
tag	the tag to write

Returns

the length written or a negative error code

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