Generic ASN.1 parsing. More...

Data Structures
struct	mbedtls_asn1_buf
	Type-length-value structure that allows for ASN1 using DER. More...
struct	mbedtls_asn1_bitstring
	Container for ASN1 bit strings. More...
struct	mbedtls_asn1_sequence
	Container for a sequence of ASN.1 items. More...
struct	mbedtls_asn1_named_data
	Container for a sequence or list of 'named' ASN.1 data items. More...
Functions to parse ASN.1 data structures
typedef struct mbedtls_asn1_buf	mbedtls_asn1_buf
	Type-length-value structure that allows for ASN1 using DER.
typedef struct mbedtls_asn1_bitstring	mbedtls_asn1_bitstring
	Container for ASN1 bit strings.
typedef struct mbedtls_asn1_sequence	mbedtls_asn1_sequence
	Container for a sequence of ASN.1 items.
typedef struct mbedtls_asn1_named_data	mbedtls_asn1_named_data
	Container for a sequence or list of 'named' ASN.1 data items.
int	mbedtls_asn1_get_len (unsigned char *p, const unsigned char end, size_t *len)
	Get the length of an ASN.1 element.
int	mbedtls_asn1_get_tag (unsigned char *p, const unsigned char end, size_t *len, int tag)
	Get the tag and length of the tag.
int	mbedtls_asn1_get_bool (unsigned char *p, const unsigned char end, int *val)
	Retrieve a boolean ASN.1 tag and its value.
int	mbedtls_asn1_get_int (unsigned char *p, const unsigned char end, int *val)
	Retrieve an integer ASN.1 tag and its value.
int	mbedtls_asn1_get_bitstring (unsigned char *p, const unsigned char end, mbedtls_asn1_bitstring *bs)
	Retrieve a bitstring ASN.1 tag and its value.
int	mbedtls_asn1_get_bitstring_null (unsigned char *p, const unsigned char end, size_t *len)
	Retrieve a bitstring ASN.1 tag without unused bits and its value.
int	mbedtls_asn1_get_sequence_of (unsigned char *p, const unsigned char end, mbedtls_asn1_sequence *cur, int tag)
	Parses and splits an ASN.1 "SEQUENCE OF <tag>" Updated the pointer to immediately behind the full sequence tag.
int	mbedtls_asn1_get_mpi (unsigned char *p, const unsigned char end, mbedtls_mpi *X)
	Retrieve a MPI value from an integer ASN.1 tag.
int	mbedtls_asn1_get_alg (unsigned char *p, const unsigned char end, mbedtls_asn1_buf alg, mbedtls_asn1_buf params)
	Retrieve an AlgorithmIdentifier ASN.1 sequence.
int	mbedtls_asn1_get_alg_null (unsigned char *p, const unsigned char end, mbedtls_asn1_buf *alg)
	Retrieve an AlgorithmIdentifier ASN.1 sequence with NULL or no params.
mbedtls_asn1_named_data *	mbedtls_asn1_find_named_data (mbedtls_asn1_named_data list, const char oid, size_t len)
	Find a specific named_data entry in a sequence or list based on the OID.
void	mbedtls_asn1_free_named_data (mbedtls_asn1_named_data *entry)
	Free a mbedtls_asn1_named_data entry.
void	mbedtls_asn1_free_named_data_list (mbedtls_asn1_named_data **head)
	Free all entries in a mbedtls_asn1_named_data list Head will be set to NULL.

Detailed Description

Generic ASN.1 parsing.

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)

Definition in file asn1.h.

Typedef Documentation

typedef struct mbedtls_asn1_bitstring mbedtls_asn1_bitstring

Container for ASN1 bit strings.

typedef struct mbedtls_asn1_buf mbedtls_asn1_buf

Type-length-value structure that allows for ASN1 using DER.

typedef struct mbedtls_asn1_named_data mbedtls_asn1_named_data

Container for a sequence or list of 'named' ASN.1 data items.

typedef struct mbedtls_asn1_sequence mbedtls_asn1_sequence

Container for a sequence of ASN.1 items.

Function Documentation

mbedtls_asn1_named_data* mbedtls_asn1_find_named_data	(	mbedtls_asn1_named_data *	list,
		const char *	oid,
		size_t	len
	)

Find a specific named_data entry in a sequence or list based on the OID.

Parameters:

list	The list to seek through
oid	The OID to look for
len	Size of the OID

Returns:: NULL if not found, or a pointer to the existing entry.

Definition at line 375 of file asn1parse.c.

void mbedtls_asn1_free_named_data ( mbedtls_asn1_named_data * entry )

Free a mbedtls_asn1_named_data entry.

Parameters:

entry The named data entry to free

Definition at line 352 of file asn1parse.c.

void mbedtls_asn1_free_named_data_list ( mbedtls_asn1_named_data ** head )

Free all entries in a mbedtls_asn1_named_data list Head will be set to NULL.

Parameters:

head	Pointer to the head of the list of named data entries to free

Definition at line 363 of file asn1parse.c.

int mbedtls_asn1_get_alg	(	unsigned char **	p,
		const unsigned char *	end,
		mbedtls_asn1_buf *	alg,
		mbedtls_asn1_buf *	params
	)

Retrieve an AlgorithmIdentifier ASN.1 sequence.

Updates the pointer to immediately behind the full AlgorithmIdentifier.

Parameters:

p	The position in the ASN.1 data
end	End of data
alg	The buffer to receive the OID
params	The buffer to receive the params (if any)

Returns:: 0 if successful or a specific ASN.1 or MPI error code.

Definition at line 290 of file asn1parse.c.

int mbedtls_asn1_get_alg_null	(	unsigned char **	p,
		const unsigned char *	end,
		mbedtls_asn1_buf *	alg
	)

Retrieve an AlgorithmIdentifier ASN.1 sequence with NULL or no params.

Updates the pointer to immediately behind the full AlgorithmIdentifier.

Parameters:

p	The position in the ASN.1 data
end	End of data
alg	The buffer to receive the OID

Returns:: 0 if successful or a specific ASN.1 or MPI error code.

Definition at line 334 of file asn1parse.c.

int mbedtls_asn1_get_bitstring	(	unsigned char **	p,
		const unsigned char *	end,
		mbedtls_asn1_bitstring *	bs
	)

Retrieve a bitstring ASN.1 tag and its value.

Updates the pointer to immediately behind the full tag.

Parameters:

p	The position in the ASN.1 data
end	End of data
bs	The variable that will receive the value

Returns:: 0 if successful or a specific ASN.1 error code.

Definition at line 189 of file asn1parse.c.

int mbedtls_asn1_get_bitstring_null	(	unsigned char **	p,
		const unsigned char *	end,
		size_t *	len
	)

Retrieve a bitstring ASN.1 tag without unused bits and its value.

Updates the pointer to the beginning of the bit/octet string.

Parameters:

p	The position in the ASN.1 data
end	End of data
len	Length of the actual bit/octect string in bytes

Returns:: 0 if successful or a specific ASN.1 error code.

Definition at line 222 of file asn1parse.c.

int mbedtls_asn1_get_bool	(	unsigned char **	p,
		const unsigned char *	end,
		int *	val
	)

Retrieve a boolean ASN.1 tag and its value.

Updates the pointer to immediately behind the full tag.

Parameters:

p	The position in the ASN.1 data
end	End of data
val	The variable that will receive the value

Returns:: 0 if successful or a specific ASN.1 error code.

Definition at line 127 of file asn1parse.c.

int mbedtls_asn1_get_int	(	unsigned char **	p,
		const unsigned char *	end,
		int *	val
	)

Retrieve an integer ASN.1 tag and its value.

Updates the pointer to immediately behind the full tag.

Parameters:

p	The position in the ASN.1 data
end	End of data
val	The variable that will receive the value

Returns:: 0 if successful or a specific ASN.1 error code.

Definition at line 146 of file asn1parse.c.

int mbedtls_asn1_get_len	(	unsigned char **	p,
		const unsigned char *	end,
		size_t *	len
	)

Get the length of an ASN.1 element.

Updates the pointer to immediately behind the length.

Parameters:

p	The position in the ASN.1 data
end	End of data
len	The variable that will receive the value

Returns:: 0 if successful, MBEDTLS_ERR_ASN1_OUT_OF_DATA on reaching end of data, MBEDTLS_ERR_ASN1_INVALID_LENGTH if length is unparseable.

Definition at line 54 of file asn1parse.c.

int mbedtls_asn1_get_mpi	(	unsigned char **	p,
		const unsigned char *	end,
		mbedtls_mpi *	X
	)

Retrieve a MPI value from an integer ASN.1 tag.

Updates the pointer to immediately behind the full tag.

Parameters:

p	The position in the ASN.1 data
end	End of data
X	The MPI that will receive the value

Returns:: 0 if successful or a specific ASN.1 or MPI error code.

Definition at line 171 of file asn1parse.c.

int mbedtls_asn1_get_sequence_of	(	unsigned char **	p,
		const unsigned char *	end,
		mbedtls_asn1_sequence *	cur,
		int	tag
	)

Parses and splits an ASN.1 "SEQUENCE OF <tag>" Updated the pointer to immediately behind the full sequence tag.

Parameters:

p	The position in the ASN.1 data
end	End of data
cur	First variable in the chain to fill
tag	Type of sequence

Returns:: 0 if successful or a specific ASN.1 error code.

Definition at line 241 of file asn1parse.c.

int mbedtls_asn1_get_tag	(	unsigned char **	p,
		const unsigned char *	end,
		size_t *	len,
		int	tag
	)

Get the tag and length of the tag.

Check for the requested tag. Updates the pointer to immediately behind the tag and length.

Parameters:

p	The position in the ASN.1 data
end	End of data
len	The variable that will receive the length
tag	The expected tag

Returns:: 0 if successful, MBEDTLS_ERR_ASN1_UNEXPECTED_TAG if tag did not match requested tag, or another specific ASN.1 error code.

Definition at line 112 of file asn1parse.c.

Type:	Library
Created:	28 Jan 2016
Imports:	47
Forks:	1
Commits:	5
Dependents:	0
Dependencies:	0
Followers:	37

asn1.h File Reference

Data Structures

Functions to parse ASN.1 data structures

Detailed Description

Typedef Documentation

Function Documentation

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asn1.h File Reference

Data Structures

Functions to parse ASN.1 data structures

Detailed Description

Typedef Documentation

Function Documentation

Repository toolbox

Repository details

Important Information for this Arm website

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