asn1write.c File Reference

#include "mbedtls/config.h"
#include "mbedtls/asn1write.h"
#include <string.h>
#include "mbedtls/platform.h"

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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 **head, 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...

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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