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1/* $OpenBSD: bytestring.h,v 1.26 2024/12/05 19:57:37 tb 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 failure. On success,
84 * |*out_ptr| should be freed with free. If |cbs| contains NUL bytes,
85 * CBS_strdup will fail.
86 */
87int CBS_strdup(const CBS *cbs, char **out_ptr);
88
89/*
90 * CBS_write_bytes writes all of the remaining data from |cbs| into |dst|
91 * if it is at most |dst_len| bytes. If |copied| is not NULL, it will be set
92 * to the amount copied. It returns one on success and zero otherwise.
93 */
94int CBS_write_bytes(const CBS *cbs, uint8_t *dst, size_t dst_len,
95 size_t *copied);
96
97/*
98 * CBS_contains_zero_byte returns one if the current contents of |cbs| contains
99 * a NUL byte and zero otherwise.
100 */
101int CBS_contains_zero_byte(const CBS *cbs);
102
103/*
104 * CBS_mem_equal compares the current contents of |cbs| with the |len| bytes
105 * starting at |data|. If they're equal, it returns one, otherwise zero. If the
106 * lengths match, it uses a constant-time comparison.
107 */
108int CBS_mem_equal(const CBS *cbs, const uint8_t *data, size_t len);
109
110/*
111 * CBS_get_u8 sets |*out| to the next uint8_t from |cbs| and advances |cbs|. It
112 * returns one on success and zero on error.
113 */
114int CBS_get_u8(CBS *cbs, uint8_t *out);
115
116/*
117 * CBS_get_u16 sets |*out| to the next, big-endian uint16_t from |cbs| and
118 * advances |cbs|. It returns one on success and zero on error.
119 */
120int CBS_get_u16(CBS *cbs, uint16_t *out);
121
122/*
123 * CBS_get_u24 sets |*out| to the next, big-endian 24-bit value from |cbs| and
124 * advances |cbs|. It returns one on success and zero on error.
125 */
126int CBS_get_u24(CBS *cbs, uint32_t *out);
127
128/*
129 * CBS_get_u32 sets |*out| to the next, big-endian uint32_t value from |cbs|
130 * and advances |cbs|. It returns one on success and zero on error.
131 */
132int CBS_get_u32(CBS *cbs, uint32_t *out);
133
134/*
135 * CBS_get_u64 sets |*out| to the next, big-endian uint64_t value from |cbs|
136 * and advances |cbs|. It returns one on success and zero on error.
137 */
138int CBS_get_u64(CBS *cbs, uint64_t *out);
139
140/*
141 * CBS_get_last_u8 sets |*out| to the last uint8_t from |cbs| and shortens
142 * |cbs|. It returns one on success and zero on error.
143 */
144int CBS_get_last_u8(CBS *cbs, uint8_t *out);
145
146/*
147 * CBS_get_bytes sets |*out| to the next |len| bytes from |cbs| and advances
148 * |cbs|. It returns one on success and zero on error.
149 */
150int CBS_get_bytes(CBS *cbs, CBS *out, size_t len);
151
152/*
153 * CBS_get_u8_length_prefixed sets |*out| to the contents of an 8-bit,
154 * length-prefixed value from |cbs| and advances |cbs| over it. It returns one
155 * on success and zero on error.
156 */
157int CBS_get_u8_length_prefixed(CBS *cbs, CBS *out);
158
159/*
160 * CBS_get_u16_length_prefixed sets |*out| to the contents of a 16-bit,
161 * big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It
162 * returns one on success and zero on error.
163 */
164int CBS_get_u16_length_prefixed(CBS *cbs, CBS *out);
165
166/*
167 * CBS_get_u24_length_prefixed sets |*out| to the contents of a 24-bit,
168 * big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It
169 * returns one on success and zero on error.
170 */
171int CBS_get_u24_length_prefixed(CBS *cbs, CBS *out);
172
173/*
174 * CBS_peek_u8 sets |*out| to the next uint8_t from |cbs|, but does not advance
175 * |cbs|. It returns one on success and zero on error.
176 */
177int CBS_peek_u8(CBS *cbs, uint8_t *out);
178
179/*
180 * CBS_peek_u16 sets |*out| to the next, big-endian uint16_t from |cbs|, but
181 * does not advance |cbs|. It returns one on success and zero on error.
182 */
183int CBS_peek_u16(CBS *cbs, uint16_t *out);
184
185/*
186 * CBS_peek_u24 sets |*out| to the next, big-endian 24-bit value from |cbs|, but
187 * does not advance |cbs|. It returns one on success and zero on error.
188 */
189int CBS_peek_u24(CBS *cbs, uint32_t *out);
190
191/*
192 * CBS_peek_u32 sets |*out| to the next, big-endian uint32_t value from |cbs|,
193 * but does not advance |cbs|. It returns one on success and zero on error.
194 */
195int CBS_peek_u32(CBS *cbs, uint32_t *out);
196
197/*
198 * CBS_peek_last_u8 sets |*out| to the last uint8_t from |cbs|, but does not
199 * shorten |cbs|. It returns one on success and zero on error.
200 */
201int CBS_peek_last_u8(CBS *cbs, uint8_t *out);
202
203
204/* Parsing ASN.1 */
205
206/*
207 * While an identifier can be multiple octets, this library only handles the
208 * single octet variety currently. This limits support up to tag number 30
209 * since tag number 31 is a reserved value to indicate multiple octets.
210 */
211
212/* Bits 8 and 7: class tag type: See X.690 section 8.1.2.2. */
213#define CBS_ASN1_UNIVERSAL 0x00
214#define CBS_ASN1_APPLICATION 0x40
215#define CBS_ASN1_CONTEXT_SPECIFIC 0x80
216#define CBS_ASN1_PRIVATE 0xc0
217
218/* Bit 6: Primitive or constructed: See X.690 section 8.1.2.3. */
219#define CBS_ASN1_PRIMITIVE 0x00
220#define CBS_ASN1_CONSTRUCTED 0x20
221
222/*
223 * Bits 5 to 1 are the tag number. See X.680 section 8.6 for tag numbers of
224 * the universal class.
225 */
226
227/*
228 * Common universal identifier octets.
229 * See X.690 section 8.1 and X.680 section 8.6 for universal tag numbers.
230 *
231 * Note: These definitions are the cause of some of the strange behavior in
232 * CBS's bs_ber.c.
233 *
234 * In BER, it is the sender's option to use primitive or constructed for
235 * bitstring (X.690 section 8.6.1) and octetstring (X.690 section 8.7.1).
236 *
237 * In DER, bitstring and octetstring are required to be primitive
238 * (X.690 section 10.2).
239 */
240#define CBS_ASN1_BOOLEAN (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x1)
241#define CBS_ASN1_INTEGER (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x2)
242#define CBS_ASN1_BITSTRING (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x3)
243#define CBS_ASN1_OCTETSTRING (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x4)
244#define CBS_ASN1_OBJECT (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x6)
245#define CBS_ASN1_ENUMERATED (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0xa)
246#define CBS_ASN1_SEQUENCE (CBS_ASN1_UNIVERSAL | CBS_ASN1_CONSTRUCTED | 0x10)
247#define CBS_ASN1_SET (CBS_ASN1_UNIVERSAL | CBS_ASN1_CONSTRUCTED | 0x11)
248
249/*
250 * CBS_get_asn1 sets |*out| to the contents of DER-encoded, ASN.1 element (not
251 * including tag and length bytes) and advances |cbs| over it. The ASN.1
252 * element must match |tag_value|. It returns one on success and zero
253 * on error.
254 *
255 * Tag numbers greater than 30 are not supported (i.e. short form only).
256 */
257int CBS_get_asn1(CBS *cbs, CBS *out, unsigned int tag_value);
258
259/*
260 * CBS_get_asn1_element acts like |CBS_get_asn1| but |out| will include the
261 * ASN.1 header bytes too.
262 */
263int CBS_get_asn1_element(CBS *cbs, CBS *out, unsigned int tag_value);
264
265/*
266 * CBS_peek_asn1_tag looks ahead at the next ASN.1 tag and returns one
267 * if the next ASN.1 element on |cbs| would have tag |tag_value|. If
268 * |cbs| is empty or the tag does not match, it returns zero. Note: if
269 * it returns one, CBS_get_asn1 may still fail if the rest of the
270 * element is malformed.
271 */
272int CBS_peek_asn1_tag(const CBS *cbs, unsigned int tag_value);
273
274/*
275 * CBS_get_any_asn1_element sets |*out| to contain the next ASN.1 element from
276 * |*cbs| (including header bytes) and advances |*cbs|. It sets |*out_tag| to
277 * the tag number and |*out_header_len| to the length of the ASN.1 header.
278 * Each of |out|, |out_tag|, and |out_header_len| may be NULL to ignore
279 * the value.
280 *
281 * Tag numbers greater than 30 are not supported (i.e. short form only).
282 */
283int CBS_get_any_asn1_element(CBS *cbs, CBS *out, unsigned int *out_tag,
284 size_t *out_header_len);
285
286/*
287 * CBS_get_asn1_uint64 gets an ASN.1 INTEGER from |cbs| using |CBS_get_asn1|
288 * and sets |*out| to its value. It returns one on success and zero on error,
289 * where error includes the integer being negative, or too large to represent
290 * in 64 bits.
291 */
292int CBS_get_asn1_uint64(CBS *cbs, uint64_t *out);
293
294/*
295 * CBS_get_optional_asn1 gets an optional explicitly-tagged element
296 * from |cbs| tagged with |tag| and sets |*out| to its contents. If
297 * present, it sets |*out_present| to one, otherwise zero. It returns
298 * one on success, whether or not the element was present, and zero on
299 * decode failure.
300 */
301int CBS_get_optional_asn1(CBS *cbs, CBS *out, int *out_present,
302 unsigned int tag);
303
304/*
305 * CBS_get_optional_asn1_octet_string gets an optional
306 * explicitly-tagged OCTET STRING from |cbs|. If present, it sets
307 * |*out| to the string and |*out_present| to one. Otherwise, it sets
308 * |*out| to empty and |*out_present| to zero. |out_present| may be
309 * NULL. It returns one on success, whether or not the element was
310 * present, and zero on decode failure.
311 */
312int CBS_get_optional_asn1_octet_string(CBS *cbs, CBS *out, int *out_present,
313 unsigned int tag);
314
315/*
316 * CBS_get_optional_asn1_uint64 gets an optional explicitly-tagged
317 * INTEGER from |cbs|. If present, it sets |*out| to the
318 * value. Otherwise, it sets |*out| to |default_value|. It returns one
319 * on success, whether or not the element was present, and zero on
320 * decode failure.
321 */
322int CBS_get_optional_asn1_uint64(CBS *cbs, uint64_t *out, unsigned int tag,
323 uint64_t default_value);
324
325/*
326 * CBS_get_optional_asn1_bool gets an optional, explicitly-tagged BOOLEAN from
327 * |cbs|. If present, it sets |*out| to either zero or one, based on the
328 * boolean. Otherwise, it sets |*out| to |default_value|. It returns one on
329 * success, whether or not the element was present, and zero on decode
330 * failure.
331 */
332int CBS_get_optional_asn1_bool(CBS *cbs, int *out, unsigned int tag,
333 int default_value);
334
335
336/*
337 * CRYPTO ByteBuilder.
338 *
339 * |CBB| objects allow one to build length-prefixed serialisations. A |CBB|
340 * object is associated with a buffer and new buffers are created with
341 * |CBB_init|. Several |CBB| objects can point at the same buffer when a
342 * length-prefix is pending, however only a single |CBB| can be 'current' at
343 * any one time. For example, if one calls |CBB_add_u8_length_prefixed| then
344 * the new |CBB| points at the same buffer as the original. But if the original
345 * |CBB| is used then the length prefix is written out and the new |CBB| must
346 * not be used again.
347 *
348 * If one needs to force a length prefix to be written out because a |CBB| is
349 * going out of scope, use |CBB_flush|.
350 */
351
352struct cbb_buffer_st {
353 uint8_t *buf;
354
355 /* The number of valid bytes. */
356 size_t len;
357
358 /* The size of buf. */
359 size_t cap;
360
361 /*
362 * One iff |buf| is owned by this object. If not then |buf| cannot be
363 * resized.
364 */
365 char can_resize;
366};
367
368typedef struct cbb_st {
369 struct cbb_buffer_st *base;
370
371 /*
372 * offset is the offset from the start of |base->buf| to the position of any
373 * pending length-prefix.
374 */
375 size_t offset;
376
377 /* child points to a child CBB if a length-prefix is pending. */
378 struct cbb_st *child;
379
380 /*
381 * pending_len_len contains the number of bytes in a pending length-prefix,
382 * or zero if no length-prefix is pending.
383 */
384 uint8_t pending_len_len;
385
386 char pending_is_asn1;
387
388 /*
389 * is_top_level is true iff this is a top-level |CBB| (as opposed to a child
390 * |CBB|). Top-level objects are valid arguments for |CBB_finish|.
391 */
392 char is_top_level;
393} CBB;
394
395/*
396 * CBB_init initialises |cbb| with |initial_capacity|. Since a |CBB| grows as
397 * needed, the |initial_capacity| is just a hint. It returns one on success or
398 * zero on error.
399 */
400int CBB_init(CBB *cbb, size_t initial_capacity);
401
402/*
403 * CBB_init_fixed initialises |cbb| to write to |len| bytes at |buf|. Since
404 * |buf| cannot grow, trying to write more than |len| bytes will cause CBB
405 * functions to fail. It returns one on success or zero on error.
406 */
407int CBB_init_fixed(CBB *cbb, uint8_t *buf, size_t len);
408
409/*
410 * CBB_cleanup frees all resources owned by |cbb| and other |CBB| objects
411 * writing to the same buffer. This should be used in an error case where a
412 * serialisation is abandoned.
413 */
414void CBB_cleanup(CBB *cbb);
415
416/*
417 * CBB_finish completes any pending length prefix and sets |*out_data| to a
418 * malloced buffer and |*out_len| to the length of that buffer. The caller
419 * takes ownership of the buffer and, unless the buffer was fixed with
420 * |CBB_init_fixed|, must call |free| when done.
421 *
422 * It can only be called on a "top level" |CBB|, i.e. one initialised with
423 * |CBB_init| or |CBB_init_fixed|. It returns one on success and zero on
424 * error.
425 */
426int CBB_finish(CBB *cbb, uint8_t **out_data, size_t *out_len);
427
428/*
429 * CBB_flush causes any pending length prefixes to be written out and any child
430 * |CBB| objects of |cbb| to be invalidated. It returns one on success or zero
431 * on error.
432 */
433int CBB_flush(CBB *cbb);
434
435/*
436 * CBB_discard_child discards the current unflushed child of |cbb|. Neither the
437 * child's contents nor the length prefix will be included in the output.
438 */
439void CBB_discard_child(CBB *cbb);
440
441/*
442 * CBB_add_u8_length_prefixed sets |*out_contents| to a new child of |cbb|. The
443 * data written to |*out_contents| will be prefixed in |cbb| with an 8-bit
444 * length. It returns one on success or zero on error.
445 */
446int CBB_add_u8_length_prefixed(CBB *cbb, CBB *out_contents);
447
448/*
449 * CBB_add_u16_length_prefixed sets |*out_contents| to a new child of |cbb|.
450 * The data written to |*out_contents| will be prefixed in |cbb| with a 16-bit,
451 * big-endian length. It returns one on success or zero on error.
452 */
453int CBB_add_u16_length_prefixed(CBB *cbb, CBB *out_contents);
454
455/*
456 * CBB_add_u24_length_prefixed sets |*out_contents| to a new child of |cbb|.
457 * The data written to |*out_contents| will be prefixed in |cbb| with a 24-bit,
458 * big-endian length. It returns one on success or zero on error.
459 */
460int CBB_add_u24_length_prefixed(CBB *cbb, CBB *out_contents);
461
462/*
463 * CBB_add_u32_length_prefixed sets |*out_contents| to a new child of |cbb|.
464 * The data written to |*out_contents| will be prefixed in |cbb| with a 32-bit,
465 * big-endian length. It returns one on success or zero on error.
466 */
467int CBB_add_u32_length_prefixed(CBB *cbb, CBB *out_contents);
468
469/*
470 * CBB_add_asn sets |*out_contents| to a |CBB| into which the contents of an
471 * ASN.1 object can be written. The |tag| argument will be used as the tag for
472 * the object. Passing in |tag| number 31 will return in an error since only
473 * single octet identifiers are supported. It returns one on success or zero
474 * on error.
475 */
476int CBB_add_asn1(CBB *cbb, CBB *out_contents, unsigned int tag);
477
478/*
479 * CBB_add_bytes appends |len| bytes from |data| to |cbb|. It returns one on
480 * success and zero otherwise.
481 */
482int CBB_add_bytes(CBB *cbb, const uint8_t *data, size_t len);
483
484/*
485 * CBB_add_space appends |len| bytes to |cbb| and sets |*out_data| to point to
486 * the beginning of that space. The caller must then write |len| bytes of
487 * actual contents to |*out_data|. It returns one on success and zero
488 * otherwise.
489 */
490int CBB_add_space(CBB *cbb, uint8_t **out_data, size_t len);
491
492/*
493 * CBB_add_u8 appends an 8-bit number from |value| to |cbb|. It returns one on
494 * success and zero otherwise.
495 */
496int CBB_add_u8(CBB *cbb, size_t value);
497
498/*
499 * CBB_add_u8 appends a 16-bit, big-endian number from |value| to |cbb|. It
500 * returns one on success and zero otherwise.
501 */
502int CBB_add_u16(CBB *cbb, size_t value);
503
504/*
505 * CBB_add_u24 appends a 24-bit, big-endian number from |value| to |cbb|. It
506 * returns one on success and zero otherwise.
507 */
508int CBB_add_u24(CBB *cbb, size_t value);
509
510/*
511 * CBB_add_u32 appends a 32-bit, big-endian number from |value| to |cbb|. It
512 * returns one on success and zero otherwise.
513 */
514int CBB_add_u32(CBB *cbb, size_t value);
515
516/*
517 * CBB_add_u64 appends a 64-bit, big-endian number from |value| to |cbb|. It
518 * returns one on success and zero otherwise.
519 */
520int CBB_add_u64(CBB *cbb, uint64_t value);
521
522/*
523 * CBB_add_asn1_uint64 writes an ASN.1 INTEGER into |cbb| using |CBB_add_asn1|
524 * and writes |value| in its contents. It returns one on success and zero on
525 * error.
526 */
527int CBB_add_asn1_uint64(CBB *cbb, uint64_t value);
528
529#ifdef LIBRESSL_INTERNAL
530/*
531 * CBS_dup sets |out| to point to cbs's |data| and |len|. It results in two
532 * CBS that point to the same buffer.
533 */
534void CBS_dup(const CBS *cbs, CBS *out);
535
536/*
537 * cbs_get_any_asn1_element sets |*out| to contain the next ASN.1 element from
538 * |*cbs| (including header bytes) and advances |*cbs|. It sets |*out_tag| to
539 * the tag number and |*out_header_len| to the length of the ASN.1 header. If
540 * strict mode is disabled and the element has indefinite length then |*out|
541 * will only contain the header. Each of |out|, |out_tag|, and
542 * |out_header_len| may be NULL to ignore the value.
543 *
544 * Tag numbers greater than 30 are not supported (i.e. short form only).
545 */
546int cbs_get_any_asn1_element_internal(CBS *cbs, CBS *out, unsigned int *out_tag,
547 size_t *out_header_len, int strict);
548
549/*
550 * CBS_asn1_indefinite_to_definite reads an ASN.1 structure from |in|. If it
551 * finds indefinite-length elements that otherwise appear to be valid DER, it
552 * attempts to convert the DER-like data to DER and sets |*out| and
553 * |*out_length| to describe a malloced buffer containing the DER data.
554 * Additionally, |*in| will be advanced over the ASN.1 data.
555 *
556 * If it doesn't find any indefinite-length elements then it sets |*out| to
557 * NULL and |*in| is unmodified.
558 *
559 * This is NOT a conversion from BER to DER. There are many restrictions when
560 * dealing with DER data. This is only concerned with one: indefinite vs.
561 * definite form. However, this suffices to handle the PKCS#7 and PKCS#12 output
562 * from NSS.
563 *
564 * It returns one on success and zero otherwise.
565 */
566int CBS_asn1_indefinite_to_definite(CBS *in, uint8_t **out, size_t *out_len);
567#endif /* LIBRESSL_INTERNAL */
568
569__END_HIDDEN_DECLS
570
571#endif /* OPENSSL_HEADER_BYTESTRING_H */
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