asn1write.h File Reference

ASN.1 buffer writing functionality. More...

#include "asn1.h"

Include dependency graph for asn1write.h:

Go to the source code of this file.

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. More...
int	mbedtls_asn1_write_tag (unsigned char **p, unsigned char *start, unsigned char tag)
	Write an ASN.1 tag in ASN.1 format. More...
int	mbedtls_asn1_write_raw_buffer (unsigned char **p, unsigned char *start, const unsigned char *buf, size_t size)
	Write raw buffer data. 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. 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. 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. 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. 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. More...
int	mbedtls_asn1_write_tagged_string (unsigned char **p, unsigned char *start, int tag, const char *text, size_t text_len)
	Write a string in ASN.1 format using a specific string encoding tag. More...
int	mbedtls_asn1_write_printable_string (unsigned char **p, unsigned char *start, const char *text, size_t text_len)
	Write a string in ASN.1 format using the PrintableString string encoding tag (MBEDTLS_ASN1_PRINTABLE_STRING). More...
int	mbedtls_asn1_write_utf8_string (unsigned char **p, unsigned char *start, const char *text, size_t text_len)
	Write a UTF8 string in ASN.1 format using the UTF8String string encoding tag (MBEDTLS_ASN1_PRINTABLE_STRING). More...
int	mbedtls_asn1_write_ia5_string (unsigned char **p, unsigned char *start, const char *text, size_t text_len)
	Write a string in ASN.1 format using the IA5String string encoding tag (MBEDTLS_ASN1_IA5_STRING). 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. 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. 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.

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	The 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	The size of the OID.
val	The data to store (can be NULL if you want to fill it by hand).
val_len	The minimum length of the data buffer needed.

Returns

A pointer to the new / existing entry on success.

NULL if if there was a memory allocation error.

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

This function works backwards in data buffer.

Parameters

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

Returns

The number of bytes written to p on success.

A negative MBEDTLS_ERR_ASN1_XXX error code on failure.

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

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
buf	The bitstring to write.
bits	The total number of bits in the bitstring.

Returns

The number of bytes written to p on success.

A negative error code on failure.

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

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
boolean	The boolean value to write, either 0 or 1.

Returns

The number of bytes written to p on success.

A negative MBEDTLS_ERR_ASN1_XXX error code on failure.

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 a string in ASN.1 format using the IA5String string encoding tag (MBEDTLS_ASN1_IA5_STRING).

Note

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
text	The string to write.
text_len	The length of text in bytes (which might be strictly larger than the number of characters).

Returns

The number of bytes written to p on success.

A negative error code on failure.

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

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
val	The integer value to write.

Returns

The number of bytes written to p on success.

A negative MBEDTLS_ERR_ASN1_XXX error code on failure.

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

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
len	The length value to write.

Returns

The number of bytes written to p on success.

A negative MBEDTLS_ERR_ASN1_XXX error code on failure.

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

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.

Returns

The number of bytes written to p on success.

A negative MBEDTLS_ERR_ASN1_XXX error code on failure.

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

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
buf	The buffer holding the data to write.
size	The length of the data buffer buf.

Returns

The number of bytes written to p on success.

A negative error code on failure.

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

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
oid	The OID to write.
oid_len	The length of the OID.

Returns

The number of bytes written to p on success.

A negative MBEDTLS_ERR_ASN1_XXX error code on failure.

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 string in ASN.1 format using the PrintableString string encoding tag (MBEDTLS_ASN1_PRINTABLE_STRING).

Note

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
text	The string to write.
text_len	The length of text in bytes (which might be strictly larger than the number of characters).

Returns

The number of bytes written to p on success.

A negative error code on failure.

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

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
buf	The data buffer to write.
size	The length of the data buffer.

Returns

The number of bytes written to p on success.

A negative MBEDTLS_ERR_ASN1_XXX error code on failure.

mbedtls_asn1_write_tag()

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

Write an ASN.1 tag in ASN.1 format.

Note

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
tag	The tag to write.

Returns

The number of bytes written to p on success.

A negative MBEDTLS_ERR_ASN1_XXX error code on failure.

mbedtls_asn1_write_tagged_string()

int mbedtls_asn1_write_tagged_string	(	unsigned char **	p,
		unsigned char *	start,
		int	tag,
		const char *	text,
		size_t	text_len
	)

Write a string in ASN.1 format using a specific string encoding tag.

Note

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
tag	The string encoding tag to write, e.g. MBEDTLS_ASN1_UTF8_STRING.
text	The string to write.
text_len	The length of text in bytes (which might be strictly larger than the number of characters).

Returns

The number of bytes written to p on success.

A negative error code on failure.

mbedtls_asn1_write_utf8_string()

int mbedtls_asn1_write_utf8_string	(	unsigned char **	p,
		unsigned char *	start,
		const char *	text,
		size_t	text_len
	)

Write a UTF8 string in ASN.1 format using the UTF8String string encoding tag (MBEDTLS_ASN1_PRINTABLE_STRING).

Note

This function works backwards in data buffer.

Parameters

p	The reference to the current position pointer.
start	The start of the buffer, for bounds-checking.
text	The string to write.
text_len	The length of text in bytes (which might be strictly larger than the number of characters).

Returns

The number of bytes written to p on success.

A negative error code on failure.