Mbed TLS v3.6.1
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asn1.h
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1
6/*
7 * Copyright The Mbed TLS Contributors
8 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
9 */
10#ifndef MBEDTLS_ASN1_H
11#define MBEDTLS_ASN1_H
13
14#include "mbedtls/build_info.h"
16
17#include <stddef.h>
18
19#if defined(MBEDTLS_BIGNUM_C)
20#include "mbedtls/bignum.h"
21#endif
22
37#define MBEDTLS_ERR_ASN1_OUT_OF_DATA -0x0060
39#define MBEDTLS_ERR_ASN1_UNEXPECTED_TAG -0x0062
41#define MBEDTLS_ERR_ASN1_INVALID_LENGTH -0x0064
43#define MBEDTLS_ERR_ASN1_LENGTH_MISMATCH -0x0066
45#define MBEDTLS_ERR_ASN1_INVALID_DATA -0x0068
47#define MBEDTLS_ERR_ASN1_ALLOC_FAILED -0x006A
49#define MBEDTLS_ERR_ASN1_BUF_TOO_SMALL -0x006C
50
64#define MBEDTLS_ASN1_BOOLEAN 0x01
65#define MBEDTLS_ASN1_INTEGER 0x02
66#define MBEDTLS_ASN1_BIT_STRING 0x03
67#define MBEDTLS_ASN1_OCTET_STRING 0x04
68#define MBEDTLS_ASN1_NULL 0x05
69#define MBEDTLS_ASN1_OID 0x06
70#define MBEDTLS_ASN1_ENUMERATED 0x0A
71#define MBEDTLS_ASN1_UTF8_STRING 0x0C
72#define MBEDTLS_ASN1_SEQUENCE 0x10
73#define MBEDTLS_ASN1_SET 0x11
74#define MBEDTLS_ASN1_PRINTABLE_STRING 0x13
75#define MBEDTLS_ASN1_T61_STRING 0x14
76#define MBEDTLS_ASN1_IA5_STRING 0x16
77#define MBEDTLS_ASN1_UTC_TIME 0x17
78#define MBEDTLS_ASN1_GENERALIZED_TIME 0x18
79#define MBEDTLS_ASN1_UNIVERSAL_STRING 0x1C
80#define MBEDTLS_ASN1_BMP_STRING 0x1E
81#define MBEDTLS_ASN1_PRIMITIVE 0x00
82#define MBEDTLS_ASN1_CONSTRUCTED 0x20
83#define MBEDTLS_ASN1_CONTEXT_SPECIFIC 0x80
84
85/* Slightly smaller way to check if tag is a string tag
86 * compared to canonical implementation. */
87#define MBEDTLS_ASN1_IS_STRING_TAG(tag) \
88 ((unsigned int) (tag) < 32u && ( \
89 ((1u << (tag)) & ((1u << MBEDTLS_ASN1_BMP_STRING) | \
90 (1u << MBEDTLS_ASN1_UTF8_STRING) | \
91 (1u << MBEDTLS_ASN1_T61_STRING) | \
92 (1u << MBEDTLS_ASN1_IA5_STRING) | \
93 (1u << MBEDTLS_ASN1_UNIVERSAL_STRING) | \
94 (1u << MBEDTLS_ASN1_PRINTABLE_STRING))) != 0))
95
96/*
97 * Bit masks for each of the components of an ASN.1 tag as specified in
98 * ITU X.690 (08/2015), section 8.1 "General rules for encoding",
99 * paragraph 8.1.2.2:
100 *
101 * Bit 8 7 6 5 1
102 * +-------+-----+------------+
103 * | Class | P/C | Tag number |
104 * +-------+-----+------------+
105 */
106#define MBEDTLS_ASN1_TAG_CLASS_MASK 0xC0
107#define MBEDTLS_ASN1_TAG_PC_MASK 0x20
108#define MBEDTLS_ASN1_TAG_VALUE_MASK 0x1F
109
113#define MBEDTLS_OID_SIZE(x) (sizeof(x) - 1)
114
121#define MBEDTLS_OID_CMP(oid_str, oid_buf) \
122 ((MBEDTLS_OID_SIZE(oid_str) != (oid_buf)->len) || \
123 memcmp((oid_str), (oid_buf)->p, (oid_buf)->len) != 0)
124
125#define MBEDTLS_OID_CMP_RAW(oid_str, oid_buf, oid_buf_len) \
126 ((MBEDTLS_OID_SIZE(oid_str) != (oid_buf_len)) || \
127 memcmp((oid_str), (oid_buf), (oid_buf_len)) != 0)
128
129#ifdef __cplusplus
130extern "C" {
131#endif
132
141typedef struct mbedtls_asn1_buf {
142 int tag;
143 size_t len;
144 unsigned char *p;
145}
147
152 size_t len;
153 unsigned char unused_bits;
154 unsigned char *p;
155}
157
161typedef struct mbedtls_asn1_sequence {
172}
174
190
196 unsigned char MBEDTLS_PRIVATE(next_merged);
197}
199
200#if defined(MBEDTLS_ASN1_PARSE_C) || defined(MBEDTLS_X509_CREATE_C) || \
201 defined(MBEDTLS_PSA_UTIL_HAVE_ECDSA)
220int mbedtls_asn1_get_len(unsigned char **p,
221 const unsigned char *end,
222 size_t *len);
223
245int mbedtls_asn1_get_tag(unsigned char **p,
246 const unsigned char *end,
247 size_t *len, int tag);
248#endif /* MBEDTLS_ASN1_PARSE_C || MBEDTLS_X509_CREATE_C || MBEDTLS_PSA_UTIL_HAVE_ECDSA */
249
250#if defined(MBEDTLS_ASN1_PARSE_C)
266int mbedtls_asn1_get_bool(unsigned char **p,
267 const unsigned char *end,
268 int *val);
269
287int mbedtls_asn1_get_int(unsigned char **p,
288 const unsigned char *end,
289 int *val);
290
308int mbedtls_asn1_get_enum(unsigned char **p,
309 const unsigned char *end,
310 int *val);
311
329int mbedtls_asn1_get_bitstring(unsigned char **p, const unsigned char *end,
331
351 const unsigned char *end,
352 size_t *len);
353
401int mbedtls_asn1_get_sequence_of(unsigned char **p,
402 const unsigned char *end,
404 int tag);
427
514 unsigned char **p,
515 const unsigned char *end,
516 unsigned char tag_must_mask, unsigned char tag_must_val,
517 unsigned char tag_may_mask, unsigned char tag_may_val,
518 int (*cb)(void *ctx, int tag,
519 unsigned char *start, size_t len),
520 void *ctx);
521
522#if defined(MBEDTLS_BIGNUM_C)
541int mbedtls_asn1_get_mpi(unsigned char **p,
542 const unsigned char *end,
543 mbedtls_mpi *X);
544#endif /* MBEDTLS_BIGNUM_C */
545
562int mbedtls_asn1_get_alg(unsigned char **p,
563 const unsigned char *end,
564 mbedtls_asn1_buf *alg, mbedtls_asn1_buf *params);
565
581int mbedtls_asn1_get_alg_null(unsigned char **p,
582 const unsigned char *end,
583 mbedtls_asn1_buf *alg);
584
596 const char *oid, size_t len);
597
598#if !defined(MBEDTLS_DEPRECATED_REMOVED)
612#endif /* MBEDTLS_DEPRECATED_REMOVED */
613
623
632
636#endif /* MBEDTLS_ASN1_PARSE_C */
637
638#ifdef __cplusplus
639}
640#endif
641
642#endif /* asn1.h */
Multi-precision integer library.
void MBEDTLS_DEPRECATED mbedtls_asn1_free_named_data(mbedtls_asn1_named_data *entry)
Free a mbedtls_asn1_named_data entry.
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 beginnin...
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_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 ta...
void mbedtls_asn1_free_named_data_list_shallow(mbedtls_asn1_named_data *name)
Free all shallow entries in a mbedtls_asn1_named_data list, but do not free internal pointer targets.
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.
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_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 se...
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.
const mbedtls_asn1_named_data * mbedtls_asn1_find_named_data(const 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.
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_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 immedia...
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 Al...
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_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 immediatel...
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.
void mbedtls_asn1_free_named_data_list(mbedtls_asn1_named_data **head)
Free all entries in a mbedtls_asn1_named_data list.
Build-time configuration info.
Common and shared functions used by multiple modules in the Mbed TLS library.
#define MBEDTLS_DEPRECATED
Definition: platform_util.h:37
Macro wrapper for struct's members.
#define MBEDTLS_PRIVATE(member)
unsigned char unused_bits
Definition: asn1.h:153
unsigned char * p
Definition: asn1.h:154
size_t len
Definition: asn1.h:143
unsigned char * p
Definition: asn1.h:144
mbedtls_asn1_buf oid
Definition: asn1.h:179
struct mbedtls_asn1_named_data * next
Definition: asn1.h:189
mbedtls_asn1_buf val
Definition: asn1.h:180
mbedtls_asn1_buf buf
Definition: asn1.h:162
struct mbedtls_asn1_sequence * next
Definition: asn1.h:171
MPI structure.
Definition: bignum.h:207