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1/* $OpenBSD: bytestring.h,v 1.23 2022/01/06 14:30:30 jsing Exp $ */
2/*
3 * Copyright (c) 2014, Google Inc.
4 *
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
12 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
14 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
15 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#ifndef OPENSSL_HEADER_BYTESTRING_H
19#define OPENSSL_HEADER_BYTESTRING_H
20
21#include <sys/types.h>
22#include <stdint.h>
23
24__BEGIN_HIDDEN_DECLS
25
26/*
27 * Bytestrings are used for parsing and building TLS and ASN.1 messages.
28 *
29 * A "CBS" (CRYPTO ByteString) represents a string of bytes in memory and
30 * provides utility functions for safely parsing length-prefixed structures
31 * like TLS and ASN.1 from it.
32 *
33 * A "CBB" (CRYPTO ByteBuilder) is a memory buffer that grows as needed and
34 * provides utility functions for building length-prefixed messages.
35 */
36
37/* CRYPTO ByteString */
38typedef struct cbs_st {
39 const uint8_t *data;
40 size_t initial_len;
41 size_t len;
42} CBS;
43
44/*
45 * CBS_init sets |cbs| to point to |data|. It does not take ownership of
46 * |data|.
47 */
48void CBS_init(CBS *cbs, const uint8_t *data, size_t len);
49
50/*
51 * CBS_skip advances |cbs| by |len| bytes. It returns one on success and zero
52 * otherwise.
53 */
54int CBS_skip(CBS *cbs, size_t len);
55
56/*
57 * CBS_data returns a pointer to the contents of |cbs|.
58 */
59const uint8_t *CBS_data(const CBS *cbs);
60
61/*
62 * CBS_len returns the number of bytes remaining in |cbs|.
63 */
64size_t CBS_len(const CBS *cbs);
65
66/*
67 * CBS_offset returns the current offset into the original data of |cbs|.
68 */
69size_t CBS_offset(const CBS *cbs);
70
71/*
72 * CBS_stow copies the current contents of |cbs| into |*out_ptr| and
73 * |*out_len|. If |*out_ptr| is not NULL, the contents are freed with
74 * free. It returns one on success and zero on allocation failure. On
75 * success, |*out_ptr| should be freed with free. If |cbs| is empty,
76 * |*out_ptr| will be NULL.
77 */
78int CBS_stow(const CBS *cbs, uint8_t **out_ptr, size_t *out_len);
79
80/*
81 * CBS_strdup copies the current contents of |cbs| into |*out_ptr| as a
82 * NUL-terminated C string. If |*out_ptr| is not NULL, the contents are freed
83 * with free. It returns one on success and zero on allocation
84 * failure. On success, |*out_ptr| should be freed with free.
85 *
86 * NOTE: If |cbs| contains NUL bytes, the string will be truncated. Call
87 * |CBS_contains_zero_byte(cbs)| to check for NUL bytes.
88 */
89int CBS_strdup(const CBS *cbs, char **out_ptr);
90
91/*
92 * CBS_write_bytes writes all of the remaining data from |cbs| into |dst|
93 * if it is at most |dst_len| bytes. If |copied| is not NULL, it will be set
94 * to the amount copied. It returns one on success and zero otherwise.
95 */
96int CBS_write_bytes(const CBS *cbs, uint8_t *dst, size_t dst_len,
97 size_t *copied);
98
99/*
100 * CBS_contains_zero_byte returns one if the current contents of |cbs| contains
101 * a NUL byte and zero otherwise.
102 */
103int CBS_contains_zero_byte(const CBS *cbs);
104
105/*
106 * CBS_mem_equal compares the current contents of |cbs| with the |len| bytes
107 * starting at |data|. If they're equal, it returns one, otherwise zero. If the
108 * lengths match, it uses a constant-time comparison.
109 */
110int CBS_mem_equal(const CBS *cbs, const uint8_t *data, size_t len);
111
112/*
113 * CBS_get_u8 sets |*out| to the next uint8_t from |cbs| and advances |cbs|. It
114 * returns one on success and zero on error.
115 */
116int CBS_get_u8(CBS *cbs, uint8_t *out);
117
118/*
119 * CBS_get_u16 sets |*out| to the next, big-endian uint16_t from |cbs| and
120 * advances |cbs|. It returns one on success and zero on error.
121 */
122int CBS_get_u16(CBS *cbs, uint16_t *out);
123
124/*
125 * CBS_get_u24 sets |*out| to the next, big-endian 24-bit value from |cbs| and
126 * advances |cbs|. It returns one on success and zero on error.
127 */
128int CBS_get_u24(CBS *cbs, uint32_t *out);
129
130/*
131 * CBS_get_u32 sets |*out| to the next, big-endian uint32_t value from |cbs|
132 * and advances |cbs|. It returns one on success and zero on error.
133 */
134int CBS_get_u32(CBS *cbs, uint32_t *out);
135
136/*
137 * CBS_get_u64 sets |*out| to the next, big-endian uint64_t value from |cbs|
138 * and advances |cbs|. It returns one on success and zero on error.
139 */
140int CBS_get_u64(CBS *cbs, uint64_t *out);
141
142/*
143 * CBS_get_last_u8 sets |*out| to the last uint8_t from |cbs| and shortens
144 * |cbs|. It returns one on success and zero on error.
145 */
146int CBS_get_last_u8(CBS *cbs, uint8_t *out);
147
148/*
149 * CBS_get_bytes sets |*out| to the next |len| bytes from |cbs| and advances
150 * |cbs|. It returns one on success and zero on error.
151 */
152int CBS_get_bytes(CBS *cbs, CBS *out, size_t len);
153
154/*
155 * CBS_get_u8_length_prefixed sets |*out| to the contents of an 8-bit,
156 * length-prefixed value from |cbs| and advances |cbs| over it. It returns one
157 * on success and zero on error.
158 */
159int CBS_get_u8_length_prefixed(CBS *cbs, CBS *out);
160
161/*
162 * CBS_get_u16_length_prefixed sets |*out| to the contents of a 16-bit,
163 * big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It
164 * returns one on success and zero on error.
165 */
166int CBS_get_u16_length_prefixed(CBS *cbs, CBS *out);
167
168/*
169 * CBS_get_u24_length_prefixed sets |*out| to the contents of a 24-bit,
170 * big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It
171 * returns one on success and zero on error.
172 */
173int CBS_get_u24_length_prefixed(CBS *cbs, CBS *out);
174
175/*
176 * CBS_peek_u8 sets |*out| to the next uint8_t from |cbs|, but does not advance
177 * |cbs|. It returns one on success and zero on error.
178 */
179int CBS_peek_u8(CBS *cbs, uint8_t *out);
180
181/*
182 * CBS_peek_u16 sets |*out| to the next, big-endian uint16_t from |cbs|, but
183 * does not advance |cbs|. It returns one on success and zero on error.
184 */
185int CBS_peek_u16(CBS *cbs, uint16_t *out);
186
187/*
188 * CBS_peek_u24 sets |*out| to the next, big-endian 24-bit value from |cbs|, but
189 * does not advance |cbs|. It returns one on success and zero on error.
190 */
191int CBS_peek_u24(CBS *cbs, uint32_t *out);
192
193/*
194 * CBS_peek_u32 sets |*out| to the next, big-endian uint32_t value from |cbs|,
195 * but does not advance |cbs|. It returns one on success and zero on error.
196 */
197int CBS_peek_u32(CBS *cbs, uint32_t *out);
198
199/*
200 * CBS_peek_last_u8 sets |*out| to the last uint8_t from |cbs|, but does not
201 * shorten |cbs|. It returns one on success and zero on error.
202 */
203int CBS_peek_last_u8(CBS *cbs, uint8_t *out);
204
205
206/* Parsing ASN.1 */
207
208/*
209 * While an identifier can be multiple octets, this library only handles the
210 * single octet variety currently. This limits support up to tag number 30
211 * since tag number 31 is a reserved value to indicate multiple octets.
212 */
213
214/* Bits 8 and 7: class tag type: See X.690 section 8.1.2.2. */
215#define CBS_ASN1_UNIVERSAL 0x00
216#define CBS_ASN1_APPLICATION 0x40
217#define CBS_ASN1_CONTEXT_SPECIFIC 0x80
218#define CBS_ASN1_PRIVATE 0xc0
219
220/* Bit 6: Primitive or constructed: See X.690 section 8.1.2.3. */
221#define CBS_ASN1_PRIMITIVE 0x00
222#define CBS_ASN1_CONSTRUCTED 0x20
223
224/*
225 * Bits 5 to 1 are the tag number. See X.680 section 8.6 for tag numbers of
226 * the universal class.
227 */
228
229/*
230 * Common universal identifier octets.
231 * See X.690 section 8.1 and X.680 section 8.6 for universal tag numbers.
232 *
233 * Note: These definitions are the cause of some of the strange behavior in
234 * CBS's bs_ber.c.
235 *
236 * In BER, it is the sender's option to use primitive or constructed for
237 * bitstring (X.690 section 8.6.1) and octetstring (X.690 section 8.7.1).
238 *
239 * In DER, bitstring and octetstring are required to be primitive
240 * (X.690 section 10.2).
241 */
242#define CBS_ASN1_BOOLEAN (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x1)
243#define CBS_ASN1_INTEGER (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x2)
244#define CBS_ASN1_BITSTRING (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x3)
245#define CBS_ASN1_OCTETSTRING (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x4)
246#define CBS_ASN1_OBJECT (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x6)
247#define CBS_ASN1_ENUMERATED (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0xa)
248#define CBS_ASN1_SEQUENCE (CBS_ASN1_UNIVERSAL | CBS_ASN1_CONSTRUCTED | 0x10)
249#define CBS_ASN1_SET (CBS_ASN1_UNIVERSAL | CBS_ASN1_CONSTRUCTED | 0x11)
250
251/*
252 * CBS_get_asn1 sets |*out| to the contents of DER-encoded, ASN.1 element (not
253 * including tag and length bytes) and advances |cbs| over it. The ASN.1
254 * element must match |tag_value|. It returns one on success and zero
255 * on error.
256 *
257 * Tag numbers greater than 30 are not supported (i.e. short form only).
258 */
259int CBS_get_asn1(CBS *cbs, CBS *out, unsigned int tag_value);
260
261/*
262 * CBS_get_asn1_element acts like |CBS_get_asn1| but |out| will include the
263 * ASN.1 header bytes too.
264 */
265int CBS_get_asn1_element(CBS *cbs, CBS *out, unsigned int tag_value);
266
267/*
268 * CBS_peek_asn1_tag looks ahead at the next ASN.1 tag and returns one
269 * if the next ASN.1 element on |cbs| would have tag |tag_value|. If
270 * |cbs| is empty or the tag does not match, it returns zero. Note: if
271 * it returns one, CBS_get_asn1 may still fail if the rest of the
272 * element is malformed.
273 */
274int CBS_peek_asn1_tag(const CBS *cbs, unsigned int tag_value);
275
276/*
277 * CBS_get_any_asn1_element sets |*out| to contain the next ASN.1 element from
278 * |*cbs| (including header bytes) and advances |*cbs|. It sets |*out_tag| to
279 * the tag number and |*out_header_len| to the length of the ASN.1 header.
280 * Each of |out|, |out_tag|, and |out_header_len| may be NULL to ignore
281 * the value.
282 *
283 * Tag numbers greater than 30 are not supported (i.e. short form only).
284 */
285int CBS_get_any_asn1_element(CBS *cbs, CBS *out, unsigned int *out_tag,
286 size_t *out_header_len);
287
288/*
289 * CBS_get_asn1_uint64 gets an ASN.1 INTEGER from |cbs| using |CBS_get_asn1|
290 * and sets |*out| to its value. It returns one on success and zero on error,
291 * where error includes the integer being negative, or too large to represent
292 * in 64 bits.
293 */
294int CBS_get_asn1_uint64(CBS *cbs, uint64_t *out);
295
296/*
297 * CBS_get_optional_asn1 gets an optional explicitly-tagged element
298 * from |cbs| tagged with |tag| and sets |*out| to its contents. If
299 * present, it sets |*out_present| to one, otherwise zero. It returns
300 * one on success, whether or not the element was present, and zero on
301 * decode failure.
302 */
303int CBS_get_optional_asn1(CBS *cbs, CBS *out, int *out_present,
304 unsigned int tag);
305
306/*
307 * CBS_get_optional_asn1_octet_string gets an optional
308 * explicitly-tagged OCTET STRING from |cbs|. If present, it sets
309 * |*out| to the string and |*out_present| to one. Otherwise, it sets
310 * |*out| to empty and |*out_present| to zero. |out_present| may be
311 * NULL. It returns one on success, whether or not the element was
312 * present, and zero on decode failure.
313 */
314int CBS_get_optional_asn1_octet_string(CBS *cbs, CBS *out, int *out_present,
315 unsigned int tag);
316
317/*
318 * CBS_get_optional_asn1_uint64 gets an optional explicitly-tagged
319 * INTEGER from |cbs|. If present, it sets |*out| to the
320 * value. Otherwise, it sets |*out| to |default_value|. It returns one
321 * on success, whether or not the element was present, and zero on
322 * decode failure.
323 */
324int CBS_get_optional_asn1_uint64(CBS *cbs, uint64_t *out, unsigned int tag,
325 uint64_t default_value);
326
327/*
328 * CBS_get_optional_asn1_bool gets an optional, explicitly-tagged BOOLEAN from
329 * |cbs|. If present, it sets |*out| to either zero or one, based on the
330 * boolean. Otherwise, it sets |*out| to |default_value|. It returns one on
331 * success, whether or not the element was present, and zero on decode
332 * failure.
333 */
334int CBS_get_optional_asn1_bool(CBS *cbs, int *out, unsigned int tag,
335 int default_value);
336
337
338/*
339 * CRYPTO ByteBuilder.
340 *
341 * |CBB| objects allow one to build length-prefixed serialisations. A |CBB|
342 * object is associated with a buffer and new buffers are created with
343 * |CBB_init|. Several |CBB| objects can point at the same buffer when a
344 * length-prefix is pending, however only a single |CBB| can be 'current' at
345 * any one time. For example, if one calls |CBB_add_u8_length_prefixed| then
346 * the new |CBB| points at the same buffer as the original. But if the original
347 * |CBB| is used then the length prefix is written out and the new |CBB| must
348 * not be used again.
349 *
350 * If one needs to force a length prefix to be written out because a |CBB| is
351 * going out of scope, use |CBB_flush|.
352 */
353
354struct cbb_buffer_st {
355 uint8_t *buf;
356
357 /* The number of valid bytes. */
358 size_t len;
359
360 /* The size of buf. */
361 size_t cap;
362
363 /*
364 * One iff |buf| is owned by this object. If not then |buf| cannot be
365 * resized.
366 */
367 char can_resize;
368};
369
370typedef struct cbb_st {
371 struct cbb_buffer_st *base;
372
373 /*
374 * offset is the offset from the start of |base->buf| to the position of any
375 * pending length-prefix.
376 */
377 size_t offset;
378
379 /* child points to a child CBB if a length-prefix is pending. */
380 struct cbb_st *child;
381
382 /*
383 * pending_len_len contains the number of bytes in a pending length-prefix,
384 * or zero if no length-prefix is pending.
385 */
386 uint8_t pending_len_len;
387
388 char pending_is_asn1;
389
390 /*
391 * is_top_level is true iff this is a top-level |CBB| (as opposed to a child
392 * |CBB|). Top-level objects are valid arguments for |CBB_finish|.
393 */
394 char is_top_level;
395} CBB;
396
397/*
398 * CBB_init initialises |cbb| with |initial_capacity|. Since a |CBB| grows as
399 * needed, the |initial_capacity| is just a hint. It returns one on success or
400 * zero on error.
401 */
402int CBB_init(CBB *cbb, size_t initial_capacity);
403
404/*
405 * CBB_init_fixed initialises |cbb| to write to |len| bytes at |buf|. Since
406 * |buf| cannot grow, trying to write more than |len| bytes will cause CBB
407 * functions to fail. It returns one on success or zero on error.
408 */
409int CBB_init_fixed(CBB *cbb, uint8_t *buf, size_t len);
410
411/*
412 * CBB_cleanup frees all resources owned by |cbb| and other |CBB| objects
413 * writing to the same buffer. This should be used in an error case where a
414 * serialisation is abandoned.
415 */
416void CBB_cleanup(CBB *cbb);
417
418/*
419 * CBB_finish completes any pending length prefix and sets |*out_data| to a
420 * malloced buffer and |*out_len| to the length of that buffer. The caller
421 * takes ownership of the buffer and, unless the buffer was fixed with
422 * |CBB_init_fixed|, must call |free| when done.
423 *
424 * It can only be called on a "top level" |CBB|, i.e. one initialised with
425 * |CBB_init| or |CBB_init_fixed|. It returns one on success and zero on
426 * error.
427 */
428int CBB_finish(CBB *cbb, uint8_t **out_data, size_t *out_len);
429
430/*
431 * CBB_flush causes any pending length prefixes to be written out and any child
432 * |CBB| objects of |cbb| to be invalidated. It returns one on success or zero
433 * on error.
434 */
435int CBB_flush(CBB *cbb);
436
437/*
438 * CBB_discard_child discards the current unflushed child of |cbb|. Neither the
439 * child's contents nor the length prefix will be included in the output.
440 */
441void CBB_discard_child(CBB *cbb);
442
443/*
444 * CBB_add_u8_length_prefixed sets |*out_contents| to a new child of |cbb|. The
445 * data written to |*out_contents| will be prefixed in |cbb| with an 8-bit
446 * length. It returns one on success or zero on error.
447 */
448int CBB_add_u8_length_prefixed(CBB *cbb, CBB *out_contents);
449
450/*
451 * CBB_add_u16_length_prefixed sets |*out_contents| to a new child of |cbb|.
452 * The data written to |*out_contents| will be prefixed in |cbb| with a 16-bit,
453 * big-endian length. It returns one on success or zero on error.
454 */
455int CBB_add_u16_length_prefixed(CBB *cbb, CBB *out_contents);
456
457/*
458 * CBB_add_u24_length_prefixed sets |*out_contents| to a new child of |cbb|.
459 * The data written to |*out_contents| will be prefixed in |cbb| with a 24-bit,
460 * big-endian length. It returns one on success or zero on error.
461 */
462int CBB_add_u24_length_prefixed(CBB *cbb, CBB *out_contents);
463
464/*
465 * CBB_add_asn sets |*out_contents| to a |CBB| into which the contents of an
466 * ASN.1 object can be written. The |tag| argument will be used as the tag for
467 * the object. Passing in |tag| number 31 will return in an error since only
468 * single octet identifiers are supported. It returns one on success or zero
469 * on error.
470 */
471int CBB_add_asn1(CBB *cbb, CBB *out_contents, unsigned int tag);
472
473/*
474 * CBB_add_bytes appends |len| bytes from |data| to |cbb|. It returns one on
475 * success and zero otherwise.
476 */
477int CBB_add_bytes(CBB *cbb, const uint8_t *data, size_t len);
478
479/*
480 * CBB_add_space appends |len| bytes to |cbb| and sets |*out_data| to point to
481 * the beginning of that space. The caller must then write |len| bytes of
482 * actual contents to |*out_data|. It returns one on success and zero
483 * otherwise.
484 */
485int CBB_add_space(CBB *cbb, uint8_t **out_data, size_t len);
486
487/*
488 * CBB_add_u8 appends an 8-bit number from |value| to |cbb|. It returns one on
489 * success and zero otherwise.
490 */
491int CBB_add_u8(CBB *cbb, size_t value);
492
493/*
494 * CBB_add_u8 appends a 16-bit, big-endian number from |value| to |cbb|. It
495 * returns one on success and zero otherwise.
496 */
497int CBB_add_u16(CBB *cbb, size_t value);
498
499/*
500 * CBB_add_u24 appends a 24-bit, big-endian number from |value| to |cbb|. It
501 * returns one on success and zero otherwise.
502 */
503int CBB_add_u24(CBB *cbb, size_t value);
504
505/*
506 * CBB_add_u32 appends a 32-bit, big-endian number from |value| to |cbb|. It
507 * returns one on success and zero otherwise.
508 */
509int CBB_add_u32(CBB *cbb, size_t value);
510
511/*
512 * CBB_add_u64 appends a 64-bit, big-endian number from |value| to |cbb|. It
513 * returns one on success and zero otherwise.
514 */
515int CBB_add_u64(CBB *cbb, uint64_t value);
516
517/*
518 * CBB_add_asn1_uint64 writes an ASN.1 INTEGER into |cbb| using |CBB_add_asn1|
519 * and writes |value| in its contents. It returns one on success and zero on
520 * error.
521 */
522int CBB_add_asn1_uint64(CBB *cbb, uint64_t value);
523
524#ifdef LIBRESSL_INTERNAL
525/*
526 * CBS_dup sets |out| to point to cbs's |data| and |len|. It results in two
527 * CBS that point to the same buffer.
528 */
529void CBS_dup(const CBS *cbs, CBS *out);
530
531/*
532 * cbs_get_any_asn1_element sets |*out| to contain the next ASN.1 element from
533 * |*cbs| (including header bytes) and advances |*cbs|. It sets |*out_tag| to
534 * the tag number and |*out_header_len| to the length of the ASN.1 header. If
535 * strict mode is disabled and the element has indefinite length then |*out|
536 * will only contain the header. Each of |out|, |out_tag|, and
537 * |out_header_len| may be NULL to ignore the value.
538 *
539 * Tag numbers greater than 30 are not supported (i.e. short form only).
540 */
541int cbs_get_any_asn1_element_internal(CBS *cbs, CBS *out, unsigned int *out_tag,
542 size_t *out_header_len, int strict);
543
544/*
545 * CBS_asn1_indefinite_to_definite reads an ASN.1 structure from |in|. If it
546 * finds indefinite-length elements that otherwise appear to be valid DER, it
547 * attempts to convert the DER-like data to DER and sets |*out| and
548 * |*out_length| to describe a malloced buffer containing the DER data.
549 * Additionally, |*in| will be advanced over the ASN.1 data.
550 *
551 * If it doesn't find any indefinite-length elements then it sets |*out| to
552 * NULL and |*in| is unmodified.
553 *
554 * This is NOT a conversion from BER to DER. There are many restrictions when
555 * dealing with DER data. This is only concerned with one: indefinite vs.
556 * definite form. However, this suffices to handle the PKCS#7 and PKCS#12 output
557 * from NSS.
558 *
559 * It returns one on success and zero otherwise.
560 */
561int CBS_asn1_indefinite_to_definite(CBS *in, uint8_t **out, size_t *out_len);
562#endif /* LIBRESSL_INTERNAL */
563
564__END_HIDDEN_DECLS
565
566#endif /* OPENSSL_HEADER_BYTESTRING_H */
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2026-02-14 02:45:21 +0000