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asn1.h File Reference

Generic ASN.1 parsing. More...

`#include "mbedtls/config.h"`
`#include <stddef.h>`
`#include "mbedtls/bignum.h"`
Include dependency graph for asn1.h:
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Go to the source code of this file.

## Data Structures

struct | mbedtls_asn1_buf
struct | mbedtls_asn1_bitstring
struct | mbedtls_asn1_sequence
struct | mbedtls_asn1_named_data

## Macros

#define | MBEDTLS_OID_SIZE(x) (sizeof(x) - 1)
#define | MBEDTLS_OID_CMP(oid_str, oid_buf)
#define | MBEDTLS_OID_CMP_RAW(oid_str, oid_buf, oid_buf_len)
ASN1 Error codes
These error codes are OR'ed to X509 error codes for higher error granularity. ASN1 is a standard to specify data structures.
#define | MBEDTLS_ERR_ASN1_OUT_OF_DATA -0x0060
#define | MBEDTLS_ERR_ASN1_UNEXPECTED_TAG -0x0062
#define | MBEDTLS_ERR_ASN1_INVALID_LENGTH -0x0064
#define | MBEDTLS_ERR_ASN1_LENGTH_MISMATCH -0x0066
#define | MBEDTLS_ERR_ASN1_INVALID_DATA -0x0068
#define | MBEDTLS_ERR_ASN1_ALLOC_FAILED -0x006A
#define | MBEDTLS_ERR_ASN1_BUF_TOO_SMALL -0x006C
DER constants

These constants comply with the DER encoded ASN.1 type tags. DER encoding uses hexadecimal representation. An example DER sequence is:

- 0x02 – tag indicating INTEGER
- 0x01 – length in octets
- 0x05 – value Such sequences are typically read into `mbedtls_x509_buf`.

#define | MBEDTLS_ASN1_BOOLEAN 0x01
#define | MBEDTLS_ASN1_INTEGER 0x02
#define | MBEDTLS_ASN1_BIT_STRING 0x03
#define | MBEDTLS_ASN1_OCTET_STRING 0x04
#define | MBEDTLS_ASN1_NULL 0x05
#define | MBEDTLS_ASN1_OID 0x06
#define | MBEDTLS_ASN1_ENUMERATED 0x0A
#define | MBEDTLS_ASN1_UTF8_STRING 0x0C
#define | MBEDTLS_ASN1_SEQUENCE 0x10
#define | MBEDTLS_ASN1_SET 0x11
#define | MBEDTLS_ASN1_PRINTABLE_STRING 0x13
#define | MBEDTLS_ASN1_T61_STRING 0x14
#define | MBEDTLS_ASN1_IA5_STRING 0x16
#define | MBEDTLS_ASN1_UTC_TIME 0x17
#define | MBEDTLS_ASN1_GENERALIZED_TIME 0x18
#define | MBEDTLS_ASN1_UNIVERSAL_STRING 0x1C
#define | MBEDTLS_ASN1_BMP_STRING 0x1E
#define | MBEDTLS_ASN1_PRIMITIVE 0x00
#define | MBEDTLS_ASN1_CONSTRUCTED 0x20
#define | MBEDTLS_ASN1_CONTEXT_SPECIFIC 0x80
#define | MBEDTLS_ASN1_IS_STRING_TAG(tag)
#define | MBEDTLS_ASN1_TAG_CLASS_MASK 0xC0
#define | MBEDTLS_ASN1_TAG_PC_MASK 0x20
#define | MBEDTLS_ASN1_TAG_VALUE_MASK 0x1F

## Functions to parse ASN.1 data structures

typedef struct mbedtls_asn1_buf | mbedtls_asn1_buf
typedef struct mbedtls_asn1_bitstring | mbedtls_asn1_bitstring
typedef struct mbedtls_asn1_sequence | mbedtls_asn1_sequence
typedef struct mbedtls_asn1_named_data | mbedtls_asn1_named_data
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.
int | mbedtls_asn1_get_tag (unsigned char **p, const unsigned char *end, size_t *len, int tag)
| Get the tag and length of the element. Check for the requested tag. Updates the pointer to immediately behind the tag and length.
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.
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.
int | mbedtls_asn1_get_enum (unsigned char **p, const unsigned char *end, int *val)
| Retrieve an enumerated ASN.1 tag and its value. Updates the pointer to immediately behind the full tag.
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.
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.
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>". Updates the pointer to immediately behind the full sequence tag.
void | mbedtls_asn1_sequence_free (mbedtls_asn1_sequence *seq)
| Free a heap-allocated linked list presentation of an ASN.1 sequence, including the first element.
int | mbedtls_asn1_traverse_sequence_of (unsigned char **p, const unsigned char *end, unsigned char tag_must_mask, unsigned char tag_must_val, unsigned char tag_may_mask, unsigned char tag_may_val, int(*cb)(void *ctx, int tag, unsigned char *start, size_t len), void *ctx)
| Traverse an ASN.1 SEQUENCE container and call a callback for each entry.
int | mbedtls_asn1_get_mpi (unsigned char **p, const unsigned char *end, mbedtls_mpi *X)
| Retrieve an integer ASN.1 tag and its value. Updates the pointer to immediately behind the full 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. Updates the pointer to immediately behind the full AlgorithmIdentifier.
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.
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.

## Detailed Description

Generic ASN.1 parsing.

Definition in file asn1.h.