1 /* Copyright (c) 2014, Google Inc. 2 * 3 * Permission to use, copy, modify, and/or distribute this software for any 4 * purpose with or without fee is hereby granted, provided that the above 5 * copyright notice and this permission notice appear in all copies. 6 * 7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ 14 15 #ifndef OPENSSL_HEADER_BYTESTRING_H 16 #define OPENSSL_HEADER_BYTESTRING_H 17 18 #include <openssl/base.h> 19 20 #if defined(__cplusplus) 21 extern "C" { 22 #endif 23 24 25 /* Bytestrings are used for parsing and building TLS and ASN.1 messages. 26 * 27 * A "CBS" (CRYPTO ByteString) represents a string of bytes in memory and 28 * provides utility functions for safely parsing length-prefixed structures 29 * like TLS and ASN.1 from it. 30 * 31 * A "CBB" (CRYPTO ByteBuilder) is a memory buffer that grows as needed and 32 * provides utility functions for building length-prefixed messages. */ 33 34 35 /* CRYPTO ByteString */ 36 37 struct cbs_st { 38 const uint8_t *data; 39 size_t len; 40 }; 41 42 /* CBS_init sets |cbs| to point to |data|. It does not take ownership of 43 * |data|. */ 44 OPENSSL_EXPORT void CBS_init(CBS *cbs, const uint8_t *data, size_t len); 45 46 /* CBS_skip advances |cbs| by |len| bytes. It returns one on success and zero 47 * otherwise. */ 48 OPENSSL_EXPORT int CBS_skip(CBS *cbs, size_t len); 49 50 /* CBS_data returns a pointer to the contents of |cbs|. */ 51 OPENSSL_EXPORT const uint8_t *CBS_data(const CBS *cbs); 52 53 /* CBS_len returns the number of bytes remaining in |cbs|. */ 54 OPENSSL_EXPORT size_t CBS_len(const CBS *cbs); 55 56 /* CBS_stow copies the current contents of |cbs| into |*out_ptr| and 57 * |*out_len|. If |*out_ptr| is not NULL, the contents are freed with 58 * OPENSSL_free. It returns one on success and zero on allocation failure. On 59 * success, |*out_ptr| should be freed with OPENSSL_free. If |cbs| is empty, 60 * |*out_ptr| will be NULL. */ 61 OPENSSL_EXPORT int CBS_stow(const CBS *cbs, uint8_t **out_ptr, size_t *out_len); 62 63 /* CBS_strdup copies the current contents of |cbs| into |*out_ptr| as a 64 * NUL-terminated C string. If |*out_ptr| is not NULL, the contents are freed 65 * with OPENSSL_free. It returns one on success and zero on allocation 66 * failure. On success, |*out_ptr| should be freed with OPENSSL_free. 67 * 68 * NOTE: If |cbs| contains NUL bytes, the string will be truncated. Call 69 * |CBS_contains_zero_byte(cbs)| to check for NUL bytes. */ 70 OPENSSL_EXPORT int CBS_strdup(const CBS *cbs, char **out_ptr); 71 72 /* CBS_contains_zero_byte returns one if the current contents of |cbs| contains 73 * a NUL byte and zero otherwise. */ 74 OPENSSL_EXPORT int CBS_contains_zero_byte(const CBS *cbs); 75 76 /* CBS_mem_equal compares the current contents of |cbs| with the |len| bytes 77 * starting at |data|. If they're equal, it returns one, otherwise zero. If the 78 * lengths match, it uses a constant-time comparison. */ 79 OPENSSL_EXPORT int CBS_mem_equal(const CBS *cbs, const uint8_t *data, 80 size_t len); 81 82 /* CBS_get_u8 sets |*out| to the next uint8_t from |cbs| and advances |cbs|. It 83 * returns one on success and zero on error. */ 84 OPENSSL_EXPORT int CBS_get_u8(CBS *cbs, uint8_t *out); 85 86 /* CBS_get_u16 sets |*out| to the next, big-endian uint16_t from |cbs| and 87 * advances |cbs|. It returns one on success and zero on error. */ 88 OPENSSL_EXPORT int CBS_get_u16(CBS *cbs, uint16_t *out); 89 90 /* CBS_get_u24 sets |*out| to the next, big-endian 24-bit value from |cbs| and 91 * advances |cbs|. It returns one on success and zero on error. */ 92 OPENSSL_EXPORT int CBS_get_u24(CBS *cbs, uint32_t *out); 93 94 /* CBS_get_u32 sets |*out| to the next, big-endian uint32_t value from |cbs| 95 * and advances |cbs|. It returns one on success and zero on error. */ 96 OPENSSL_EXPORT int CBS_get_u32(CBS *cbs, uint32_t *out); 97 98 /* CBS_get_last_u8 sets |*out| to the last uint8_t from |cbs| and shortens 99 * |cbs|. It returns one on success and zero on error. */ 100 OPENSSL_EXPORT int CBS_get_last_u8(CBS *cbs, uint8_t *out); 101 102 /* CBS_get_bytes sets |*out| to the next |len| bytes from |cbs| and advances 103 * |cbs|. It returns one on success and zero on error. */ 104 OPENSSL_EXPORT int CBS_get_bytes(CBS *cbs, CBS *out, size_t len); 105 106 /* CBS_copy_bytes copies the next |len| bytes from |cbs| to |out| and advances 107 * |cbs|. It returns one on success and zero on error. */ 108 OPENSSL_EXPORT int CBS_copy_bytes(CBS *cbs, uint8_t *out, size_t len); 109 110 /* CBS_get_u8_length_prefixed sets |*out| to the contents of an 8-bit, 111 * length-prefixed value from |cbs| and advances |cbs| over it. It returns one 112 * on success and zero on error. */ 113 OPENSSL_EXPORT int CBS_get_u8_length_prefixed(CBS *cbs, CBS *out); 114 115 /* CBS_get_u16_length_prefixed sets |*out| to the contents of a 16-bit, 116 * big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It 117 * returns one on success and zero on error. */ 118 OPENSSL_EXPORT int CBS_get_u16_length_prefixed(CBS *cbs, CBS *out); 119 120 /* CBS_get_u24_length_prefixed sets |*out| to the contents of a 24-bit, 121 * big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It 122 * returns one on success and zero on error. */ 123 OPENSSL_EXPORT int CBS_get_u24_length_prefixed(CBS *cbs, CBS *out); 124 125 126 /* Parsing ASN.1 */ 127 128 /* The following values are tag numbers for UNIVERSAL elements. */ 129 #define CBS_ASN1_BOOLEAN 0x1u 130 #define CBS_ASN1_INTEGER 0x2u 131 #define CBS_ASN1_BITSTRING 0x3u 132 #define CBS_ASN1_OCTETSTRING 0x4u 133 #define CBS_ASN1_NULL 0x5u 134 #define CBS_ASN1_OBJECT 0x6u 135 #define CBS_ASN1_ENUMERATED 0xau 136 #define CBS_ASN1_UTF8STRING 0xcu 137 #define CBS_ASN1_SEQUENCE (0x10u | CBS_ASN1_CONSTRUCTED) 138 #define CBS_ASN1_SET (0x11u | CBS_ASN1_CONSTRUCTED) 139 #define CBS_ASN1_NUMERICSTRING 0x12u 140 #define CBS_ASN1_PRINTABLESTRING 0x13u 141 #define CBS_ASN1_T61STRING 0x14u 142 #define CBS_ASN1_VIDEOTEXSTRING 0x15u 143 #define CBS_ASN1_IA5STRING 0x16u 144 #define CBS_ASN1_UTCTIME 0x17u 145 #define CBS_ASN1_GENERALIZEDTIME 0x18u 146 #define CBS_ASN1_GRAPHICSTRING 0x19u 147 #define CBS_ASN1_VISIBLESTRING 0x1au 148 #define CBS_ASN1_GENERALSTRING 0x1bu 149 #define CBS_ASN1_UNIVERSALSTRING 0x1cu 150 #define CBS_ASN1_BMPSTRING 0x1eu 151 152 /* CBS_ASN1_CONSTRUCTED may be ORed into a tag to toggle the constructed 153 * bit. |CBS| and |CBB| APIs consider the constructed bit to be part of the 154 * tag. */ 155 #define CBS_ASN1_CONSTRUCTED 0x20u 156 157 /* The following values specify the constructed bit or tag class and may be ORed 158 * into a tag number to produce the final tag. If none is used, the tag will be 159 * UNIVERSAL. 160 * 161 * Note that although they currently match the DER serialization, consumers must 162 * use these bits rather than make assumptions about the representation. This is 163 * to allow for tag numbers beyond 31 in the future. */ 164 #define CBS_ASN1_APPLICATION 0x40u 165 #define CBS_ASN1_CONTEXT_SPECIFIC 0x80u 166 #define CBS_ASN1_PRIVATE 0xc0u 167 168 /* CBS_ASN1_CLASS_MASK may be ANDed with a tag to query its class. */ 169 #define CBS_ASN1_CLASS_MASK 0xc0u 170 171 /* CBS_ASN1_TAG_NUMBER_MASK may be ANDed with a tag to query its number. */ 172 #define CBS_ASN1_TAG_NUMBER_MASK 0x1fu 173 174 /* CBS_get_asn1 sets |*out| to the contents of DER-encoded, ASN.1 element (not 175 * including tag and length bytes) and advances |cbs| over it. The ASN.1 176 * element must match |tag_value|. It returns one on success and zero 177 * on error. 178 * 179 * Tag numbers greater than 30 are not supported (i.e. short form only). */ 180 OPENSSL_EXPORT int CBS_get_asn1(CBS *cbs, CBS *out, unsigned tag_value); 181 182 /* CBS_get_asn1_element acts like |CBS_get_asn1| but |out| will include the 183 * ASN.1 header bytes too. */ 184 OPENSSL_EXPORT int CBS_get_asn1_element(CBS *cbs, CBS *out, unsigned tag_value); 185 186 /* CBS_peek_asn1_tag looks ahead at the next ASN.1 tag and returns one 187 * if the next ASN.1 element on |cbs| would have tag |tag_value|. If 188 * |cbs| is empty or the tag does not match, it returns zero. Note: if 189 * it returns one, CBS_get_asn1 may still fail if the rest of the 190 * element is malformed. */ 191 OPENSSL_EXPORT int CBS_peek_asn1_tag(const CBS *cbs, unsigned tag_value); 192 193 /* CBS_get_any_asn1 sets |*out| to contain the next ASN.1 element from |*cbs| 194 * (not including tag and length bytes), sets |*out_tag| to the tag number, and 195 * advances |*cbs|. It returns one on success and zero on error. Either of |out| 196 * and |out_tag| may be NULL to ignore the value. 197 * 198 * Tag numbers greater than 30 are not supported (i.e. short form only). */ 199 OPENSSL_EXPORT int CBS_get_any_asn1(CBS *cbs, CBS *out, unsigned *out_tag); 200 201 /* CBS_get_any_asn1_element sets |*out| to contain the next ASN.1 element from 202 * |*cbs| (including header bytes) and advances |*cbs|. It sets |*out_tag| to 203 * the tag number and |*out_header_len| to the length of the ASN.1 header. Each 204 * of |out|, |out_tag|, and |out_header_len| may be NULL to ignore the value. 205 * 206 * Tag numbers greater than 30 are not supported (i.e. short form only). */ 207 OPENSSL_EXPORT int CBS_get_any_asn1_element(CBS *cbs, CBS *out, 208 unsigned *out_tag, 209 size_t *out_header_len); 210 211 /* CBS_get_any_ber_asn1_element acts the same as |CBS_get_any_asn1_element| but 212 * also allows indefinite-length elements to be returned. In that case, 213 * |*out_header_len| and |CBS_len(out)| will both be two as only the header is 214 * returned, otherwise it behaves the same as the previous function. */ 215 OPENSSL_EXPORT int CBS_get_any_ber_asn1_element(CBS *cbs, CBS *out, 216 unsigned *out_tag, 217 size_t *out_header_len); 218 219 /* CBS_get_asn1_uint64 gets an ASN.1 INTEGER from |cbs| using |CBS_get_asn1| 220 * and sets |*out| to its value. It returns one on success and zero on error, 221 * where error includes the integer being negative, or too large to represent 222 * in 64 bits. */ 223 OPENSSL_EXPORT int CBS_get_asn1_uint64(CBS *cbs, uint64_t *out); 224 225 /* CBS_get_optional_asn1 gets an optional explicitly-tagged element from |cbs| 226 * tagged with |tag| and sets |*out| to its contents. If present and if 227 * |out_present| is not NULL, it sets |*out_present| to one, otherwise zero. It 228 * returns one on success, whether or not the element was present, and zero on 229 * decode failure. */ 230 OPENSSL_EXPORT int CBS_get_optional_asn1(CBS *cbs, CBS *out, int *out_present, 231 unsigned tag); 232 233 /* CBS_get_optional_asn1_octet_string gets an optional 234 * explicitly-tagged OCTET STRING from |cbs|. If present, it sets 235 * |*out| to the string and |*out_present| to one. Otherwise, it sets 236 * |*out| to empty and |*out_present| to zero. |out_present| may be 237 * NULL. It returns one on success, whether or not the element was 238 * present, and zero on decode failure. */ 239 OPENSSL_EXPORT int CBS_get_optional_asn1_octet_string(CBS *cbs, CBS *out, 240 int *out_present, 241 unsigned tag); 242 243 /* CBS_get_optional_asn1_uint64 gets an optional explicitly-tagged 244 * INTEGER from |cbs|. If present, it sets |*out| to the 245 * value. Otherwise, it sets |*out| to |default_value|. It returns one 246 * on success, whether or not the element was present, and zero on 247 * decode failure. */ 248 OPENSSL_EXPORT int CBS_get_optional_asn1_uint64(CBS *cbs, uint64_t *out, 249 unsigned tag, 250 uint64_t default_value); 251 252 /* CBS_get_optional_asn1_bool gets an optional, explicitly-tagged BOOLEAN from 253 * |cbs|. If present, it sets |*out| to either zero or one, based on the 254 * boolean. Otherwise, it sets |*out| to |default_value|. It returns one on 255 * success, whether or not the element was present, and zero on decode 256 * failure. */ 257 OPENSSL_EXPORT int CBS_get_optional_asn1_bool(CBS *cbs, int *out, unsigned tag, 258 int default_value); 259 260 /* CBS_is_valid_asn1_bitstring returns one if |cbs| is a valid ASN.1 BIT STRING 261 * and zero otherwise. */ 262 OPENSSL_EXPORT int CBS_is_valid_asn1_bitstring(const CBS *cbs); 263 264 /* CBS_asn1_bitstring_has_bit returns one if |cbs| is a valid ASN.1 BIT STRING 265 * and the specified bit is present and set. Otherwise, it returns zero. |bit| 266 * is indexed starting from zero. */ 267 OPENSSL_EXPORT int CBS_asn1_bitstring_has_bit(const CBS *cbs, unsigned bit); 268 269 270 /* CRYPTO ByteBuilder. 271 * 272 * |CBB| objects allow one to build length-prefixed serialisations. A |CBB| 273 * object is associated with a buffer and new buffers are created with 274 * |CBB_init|. Several |CBB| objects can point at the same buffer when a 275 * length-prefix is pending, however only a single |CBB| can be 'current' at 276 * any one time. For example, if one calls |CBB_add_u8_length_prefixed| then 277 * the new |CBB| points at the same buffer as the original. But if the original 278 * |CBB| is used then the length prefix is written out and the new |CBB| must 279 * not be used again. 280 * 281 * If one needs to force a length prefix to be written out because a |CBB| is 282 * going out of scope, use |CBB_flush|. If an operation on a |CBB| fails, it is 283 * in an undefined state and must not be used except to call |CBB_cleanup|. */ 284 285 struct cbb_buffer_st { 286 uint8_t *buf; 287 size_t len; /* The number of valid bytes. */ 288 size_t cap; /* The size of buf. */ 289 char can_resize; /* One iff |buf| is owned by this object. If not then |buf| 290 cannot be resized. */ 291 char error; /* One iff there was an error writing to this CBB. All future 292 operations will fail. */ 293 }; 294 295 struct cbb_st { 296 struct cbb_buffer_st *base; 297 /* child points to a child CBB if a length-prefix is pending. */ 298 CBB *child; 299 /* offset is the number of bytes from the start of |base->buf| to this |CBB|'s 300 * pending length prefix. */ 301 size_t offset; 302 /* pending_len_len contains the number of bytes in this |CBB|'s pending 303 * length-prefix, or zero if no length-prefix is pending. */ 304 uint8_t pending_len_len; 305 char pending_is_asn1; 306 /* is_top_level is true iff this is a top-level |CBB| (as opposed to a child 307 * |CBB|). Top-level objects are valid arguments for |CBB_finish|. */ 308 char is_top_level; 309 }; 310 311 /* CBB_zero sets an uninitialised |cbb| to the zero state. It must be 312 * initialised with |CBB_init| or |CBB_init_fixed| before use, but it is safe to 313 * call |CBB_cleanup| without a successful |CBB_init|. This may be used for more 314 * uniform cleanup of a |CBB|. */ 315 OPENSSL_EXPORT void CBB_zero(CBB *cbb); 316 317 /* CBB_init initialises |cbb| with |initial_capacity|. Since a |CBB| grows as 318 * needed, the |initial_capacity| is just a hint. It returns one on success or 319 * zero on error. */ 320 OPENSSL_EXPORT int CBB_init(CBB *cbb, size_t initial_capacity); 321 322 /* CBB_init_fixed initialises |cbb| to write to |len| bytes at |buf|. Since 323 * |buf| cannot grow, trying to write more than |len| bytes will cause CBB 324 * functions to fail. It returns one on success or zero on error. */ 325 OPENSSL_EXPORT int CBB_init_fixed(CBB *cbb, uint8_t *buf, size_t len); 326 327 /* CBB_cleanup frees all resources owned by |cbb| and other |CBB| objects 328 * writing to the same buffer. This should be used in an error case where a 329 * serialisation is abandoned. 330 * 331 * This function can only be called on a "top level" |CBB|, i.e. one initialised 332 * with |CBB_init| or |CBB_init_fixed|, or a |CBB| set to the zero state with 333 * |CBB_zero|. */ 334 OPENSSL_EXPORT void CBB_cleanup(CBB *cbb); 335 336 /* CBB_finish completes any pending length prefix and sets |*out_data| to a 337 * malloced buffer and |*out_len| to the length of that buffer. The caller 338 * takes ownership of the buffer and, unless the buffer was fixed with 339 * |CBB_init_fixed|, must call |OPENSSL_free| when done. 340 * 341 * It can only be called on a "top level" |CBB|, i.e. one initialised with 342 * |CBB_init| or |CBB_init_fixed|. It returns one on success and zero on 343 * error. */ 344 OPENSSL_EXPORT int CBB_finish(CBB *cbb, uint8_t **out_data, size_t *out_len); 345 346 /* CBB_flush causes any pending length prefixes to be written out and any child 347 * |CBB| objects of |cbb| to be invalidated. This allows |cbb| to continue to be 348 * used after the children go out of scope, e.g. when local |CBB| objects are 349 * added as children to a |CBB| that persists after a function returns. This 350 * function returns one on success or zero on error. */ 351 OPENSSL_EXPORT int CBB_flush(CBB *cbb); 352 353 /* CBB_data returns a pointer to the bytes written to |cbb|. It does not flush 354 * |cbb|. The pointer is valid until the next operation to |cbb|. 355 * 356 * To avoid unfinalized length prefixes, it is a fatal error to call this on a 357 * CBB with any active children. */ 358 OPENSSL_EXPORT const uint8_t *CBB_data(const CBB *cbb); 359 360 /* CBB_len returns the number of bytes written to |cbb|. It does not flush 361 * |cbb|. 362 * 363 * To avoid unfinalized length prefixes, it is a fatal error to call this on a 364 * CBB with any active children. */ 365 OPENSSL_EXPORT size_t CBB_len(const CBB *cbb); 366 367 /* CBB_add_u8_length_prefixed sets |*out_contents| to a new child of |cbb|. The 368 * data written to |*out_contents| will be prefixed in |cbb| with an 8-bit 369 * length. It returns one on success or zero on error. */ 370 OPENSSL_EXPORT int CBB_add_u8_length_prefixed(CBB *cbb, CBB *out_contents); 371 372 /* CBB_add_u16_length_prefixed sets |*out_contents| to a new child of |cbb|. 373 * The data written to |*out_contents| will be prefixed in |cbb| with a 16-bit, 374 * big-endian length. It returns one on success or zero on error. */ 375 OPENSSL_EXPORT int CBB_add_u16_length_prefixed(CBB *cbb, CBB *out_contents); 376 377 /* CBB_add_u24_length_prefixed sets |*out_contents| to a new child of |cbb|. 378 * The data written to |*out_contents| will be prefixed in |cbb| with a 24-bit, 379 * big-endian length. It returns one on success or zero on error. */ 380 OPENSSL_EXPORT int CBB_add_u24_length_prefixed(CBB *cbb, CBB *out_contents); 381 382 /* CBB_add_asn1 sets |*out_contents| to a |CBB| into which the contents of an 383 * ASN.1 object can be written. The |tag| argument will be used as the tag for 384 * the object. Passing in |tag| number 31 will return in an error since only 385 * single octet identifiers are supported. It returns one on success or zero 386 * on error. */ 387 OPENSSL_EXPORT int CBB_add_asn1(CBB *cbb, CBB *out_contents, unsigned tag); 388 389 /* CBB_add_bytes appends |len| bytes from |data| to |cbb|. It returns one on 390 * success and zero otherwise. */ 391 OPENSSL_EXPORT int CBB_add_bytes(CBB *cbb, const uint8_t *data, size_t len); 392 393 /* CBB_add_space appends |len| bytes to |cbb| and sets |*out_data| to point to 394 * the beginning of that space. The caller must then write |len| bytes of 395 * actual contents to |*out_data|. It returns one on success and zero 396 * otherwise. */ 397 OPENSSL_EXPORT int CBB_add_space(CBB *cbb, uint8_t **out_data, size_t len); 398 399 /* CBB_reserve ensures |cbb| has room for |len| additional bytes and sets 400 * |*out_data| to point to the beginning of that space. It returns one on 401 * success and zero otherwise. The caller may write up to |len| bytes to 402 * |*out_data| and call |CBB_did_write| to complete the write. |*out_data| is 403 * valid until the next operation on |cbb| or an ancestor |CBB|. */ 404 OPENSSL_EXPORT int CBB_reserve(CBB *cbb, uint8_t **out_data, size_t len); 405 406 /* CBB_did_write advances |cbb| by |len| bytes, assuming the space has been 407 * written to by the caller. It returns one on success and zero on error. */ 408 OPENSSL_EXPORT int CBB_did_write(CBB *cbb, size_t len); 409 410 /* CBB_add_u8 appends an 8-bit number from |value| to |cbb|. It returns one on 411 * success and zero otherwise. */ 412 OPENSSL_EXPORT int CBB_add_u8(CBB *cbb, uint8_t value); 413 414 /* CBB_add_u16 appends a 16-bit, big-endian number from |value| to |cbb|. It 415 * returns one on success and zero otherwise. */ 416 OPENSSL_EXPORT int CBB_add_u16(CBB *cbb, uint16_t value); 417 418 /* CBB_add_u24 appends a 24-bit, big-endian number from |value| to |cbb|. It 419 * returns one on success and zero otherwise. */ 420 OPENSSL_EXPORT int CBB_add_u24(CBB *cbb, uint32_t value); 421 422 /* CBB_add_u32 appends a 32-bit, big-endian number from |value| to |cbb|. It 423 * returns one on success and zero otherwise. */ 424 OPENSSL_EXPORT int CBB_add_u32(CBB *cbb, uint32_t value); 425 426 /* CBB_discard_child discards the current unflushed child of |cbb|. Neither the 427 * child's contents nor the length prefix will be included in the output. */ 428 OPENSSL_EXPORT void CBB_discard_child(CBB *cbb); 429 430 /* CBB_add_asn1_uint64 writes an ASN.1 INTEGER into |cbb| using |CBB_add_asn1| 431 * and writes |value| in its contents. It returns one on success and zero on 432 * error. */ 433 OPENSSL_EXPORT int CBB_add_asn1_uint64(CBB *cbb, uint64_t value); 434 435 436 #if defined(__cplusplus) 437 } /* extern C */ 438 439 440 #if !defined(BORINGSSL_NO_CXX) 441 extern "C++" { 442 443 namespace bssl { 444 445 using ScopedCBB = internal::StackAllocated<CBB, void, CBB_zero, CBB_cleanup>; 446 447 } // namespace bssl 448 449 } // extern C++ 450 #endif 451 452 #endif 453 454 #endif /* OPENSSL_HEADER_BYTESTRING_H */ 455