asn1parse.c File Reference

#include "mbedtls/config.h"
#include "mbedtls/asn1.h"
#include <string.h>
#include "mbedtls/bignum.h"
#include "mbedtls/platform.h"
#include "arc4_alt.h"

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Functions
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. More...
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. More...
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. More...
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. More...
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. More...
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. More...
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. More...
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. More...
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. More...
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. More...
void	mbedtls_asn1_free_named_data (mbedtls_asn1_named_data *cur)
	Free a mbedtls_asn1_named_data entry. More...
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. More...
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. More...

Function Documentation

mbedtls_asn1_find_named_data()

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.

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mbedtls_asn1_free_named_data()

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

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mbedtls_asn1_free_named_data_list()

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

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mbedtls_asn1_get_alg()

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.

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mbedtls_asn1_get_alg_null()

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.

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mbedtls_asn1_get_bitstring()

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.

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mbedtls_asn1_get_bitstring_null()

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.

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mbedtls_asn1_get_bool()

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.

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mbedtls_asn1_get_int()

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.

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mbedtls_asn1_get_len()

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.

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mbedtls_asn1_get_mpi()

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.

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mbedtls_asn1_get_sequence_of()

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.

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mbedtls_asn1_get_tag()

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.

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