--- /dev/null
+/* Copyright (c) 2014, Google Inc.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
+
+#ifndef OPENSSL_HEADER_BYTESTRING_H
+#define OPENSSL_HEADER_BYTESTRING_H
+
+#include <openssl/base.h>
+
+#include <openssl/span.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+
+// Bytestrings are used for parsing and building TLS and ASN.1 messages.
+//
+// A "CBS" (CRYPTO ByteString) represents a string of bytes in memory and
+// provides utility functions for safely parsing length-prefixed structures
+// like TLS and ASN.1 from it.
+//
+// A "CBB" (CRYPTO ByteBuilder) is a memory buffer that grows as needed and
+// provides utility functions for building length-prefixed messages.
+
+
+// CRYPTO ByteString
+
+struct cbs_st {
+ const uint8_t *data;
+ size_t len;
+
+#if !defined(BORINGSSL_NO_CXX)
+ // Allow implicit conversions to and from bssl::Span<const uint8_t>.
+ cbs_st(bssl::Span<const uint8_t> span)
+ : data(span.data()), len(span.size()) {}
+ operator bssl::Span<const uint8_t>() const {
+ return bssl::MakeConstSpan(data, len);
+ }
+
+ // Defining any constructors requires we explicitly default the others.
+ cbs_st() = default;
+ cbs_st(const cbs_st &) = default;
+#endif
+};
+
+// CBS_init sets |cbs| to point to |data|. It does not take ownership of
+// |data|.
+OPENSSL_EXPORT void CBS_init(CBS *cbs, const uint8_t *data, size_t len);
+
+// CBS_skip advances |cbs| by |len| bytes. It returns one on success and zero
+// otherwise.
+OPENSSL_EXPORT int CBS_skip(CBS *cbs, size_t len);
+
+// CBS_data returns a pointer to the contents of |cbs|.
+OPENSSL_EXPORT const uint8_t *CBS_data(const CBS *cbs);
+
+// CBS_len returns the number of bytes remaining in |cbs|.
+OPENSSL_EXPORT size_t CBS_len(const CBS *cbs);
+
+// CBS_stow copies the current contents of |cbs| into |*out_ptr| and
+// |*out_len|. If |*out_ptr| is not NULL, the contents are freed with
+// OPENSSL_free. It returns one on success and zero on allocation failure. On
+// success, |*out_ptr| should be freed with OPENSSL_free. If |cbs| is empty,
+// |*out_ptr| will be NULL.
+OPENSSL_EXPORT int CBS_stow(const CBS *cbs, uint8_t **out_ptr, size_t *out_len);
+
+// CBS_strdup copies the current contents of |cbs| into |*out_ptr| as a
+// NUL-terminated C string. If |*out_ptr| is not NULL, the contents are freed
+// with OPENSSL_free. It returns one on success and zero on allocation
+// failure. On success, |*out_ptr| should be freed with OPENSSL_free.
+//
+// NOTE: If |cbs| contains NUL bytes, the string will be truncated. Call
+// |CBS_contains_zero_byte(cbs)| to check for NUL bytes.
+OPENSSL_EXPORT int CBS_strdup(const CBS *cbs, char **out_ptr);
+
+// CBS_contains_zero_byte returns one if the current contents of |cbs| contains
+// a NUL byte and zero otherwise.
+OPENSSL_EXPORT int CBS_contains_zero_byte(const CBS *cbs);
+
+// CBS_mem_equal compares the current contents of |cbs| with the |len| bytes
+// starting at |data|. If they're equal, it returns one, otherwise zero. If the
+// lengths match, it uses a constant-time comparison.
+OPENSSL_EXPORT int CBS_mem_equal(const CBS *cbs, const uint8_t *data,
+ size_t len);
+
+// CBS_get_u8 sets |*out| to the next uint8_t from |cbs| and advances |cbs|. It
+// returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_get_u8(CBS *cbs, uint8_t *out);
+
+// CBS_get_u16 sets |*out| to the next, big-endian uint16_t from |cbs| and
+// advances |cbs|. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_get_u16(CBS *cbs, uint16_t *out);
+
+// CBS_get_u24 sets |*out| to the next, big-endian 24-bit value from |cbs| and
+// advances |cbs|. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_get_u24(CBS *cbs, uint32_t *out);
+
+// CBS_get_u32 sets |*out| to the next, big-endian uint32_t value from |cbs|
+// and advances |cbs|. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_get_u32(CBS *cbs, uint32_t *out);
+
+// CBS_get_last_u8 sets |*out| to the last uint8_t from |cbs| and shortens
+// |cbs|. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_get_last_u8(CBS *cbs, uint8_t *out);
+
+// CBS_get_bytes sets |*out| to the next |len| bytes from |cbs| and advances
+// |cbs|. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_get_bytes(CBS *cbs, CBS *out, size_t len);
+
+// CBS_copy_bytes copies the next |len| bytes from |cbs| to |out| and advances
+// |cbs|. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_copy_bytes(CBS *cbs, uint8_t *out, size_t len);
+
+// CBS_get_u8_length_prefixed sets |*out| to the contents of an 8-bit,
+// length-prefixed value from |cbs| and advances |cbs| over it. It returns one
+// on success and zero on error.
+OPENSSL_EXPORT int CBS_get_u8_length_prefixed(CBS *cbs, CBS *out);
+
+// CBS_get_u16_length_prefixed sets |*out| to the contents of a 16-bit,
+// big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It
+// returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_get_u16_length_prefixed(CBS *cbs, CBS *out);
+
+// CBS_get_u24_length_prefixed sets |*out| to the contents of a 24-bit,
+// big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It
+// returns one on success and zero on error.
+OPENSSL_EXPORT int CBS_get_u24_length_prefixed(CBS *cbs, CBS *out);
+
+
+// Parsing ASN.1
+
+// The following values are tag numbers for UNIVERSAL elements.
+#define CBS_ASN1_BOOLEAN 0x1u
+#define CBS_ASN1_INTEGER 0x2u
+#define CBS_ASN1_BITSTRING 0x3u
+#define CBS_ASN1_OCTETSTRING 0x4u
+#define CBS_ASN1_NULL 0x5u
+#define CBS_ASN1_OBJECT 0x6u
+#define CBS_ASN1_ENUMERATED 0xau
+#define CBS_ASN1_UTF8STRING 0xcu
+#define CBS_ASN1_SEQUENCE (0x10u | CBS_ASN1_CONSTRUCTED)
+#define CBS_ASN1_SET (0x11u | CBS_ASN1_CONSTRUCTED)
+#define CBS_ASN1_NUMERICSTRING 0x12u
+#define CBS_ASN1_PRINTABLESTRING 0x13u
+#define CBS_ASN1_T61STRING 0x14u
+#define CBS_ASN1_VIDEOTEXSTRING 0x15u
+#define CBS_ASN1_IA5STRING 0x16u
+#define CBS_ASN1_UTCTIME 0x17u
+#define CBS_ASN1_GENERALIZEDTIME 0x18u
+#define CBS_ASN1_GRAPHICSTRING 0x19u
+#define CBS_ASN1_VISIBLESTRING 0x1au
+#define CBS_ASN1_GENERALSTRING 0x1bu
+#define CBS_ASN1_UNIVERSALSTRING 0x1cu
+#define CBS_ASN1_BMPSTRING 0x1eu
+
+// CBS_ASN1_TAG_SHIFT is how much the in-memory representation shifts the class
+// and constructed bits from the DER serialization. This allows representing tag
+// numbers beyond 31.
+//
+// Consumers must use the following constants to decompose or assemble tags.
+#define CBS_ASN1_TAG_SHIFT 24
+
+// CBS_ASN1_CONSTRUCTED may be ORed into a tag to toggle the constructed
+// bit. |CBS| and |CBB| APIs consider the constructed bit to be part of the
+// tag.
+#define CBS_ASN1_CONSTRUCTED (0x20u << CBS_ASN1_TAG_SHIFT)
+
+// The following values specify the tag class and may be ORed into a tag number
+// to produce the final tag. If none is used, the tag will be UNIVERSAL.
+#define CBS_ASN1_UNIVERSAL (0u << CBS_ASN1_TAG_SHIFT)
+#define CBS_ASN1_APPLICATION (0x40u << CBS_ASN1_TAG_SHIFT)
+#define CBS_ASN1_CONTEXT_SPECIFIC (0x80u << CBS_ASN1_TAG_SHIFT)
+#define CBS_ASN1_PRIVATE (0xc0u << CBS_ASN1_TAG_SHIFT)
+
+// CBS_ASN1_CLASS_MASK may be ANDed with a tag to query its class. This will
+// give one of the four values above.
+#define CBS_ASN1_CLASS_MASK (0xc0u << CBS_ASN1_TAG_SHIFT)
+
+// CBS_ASN1_TAG_NUMBER_MASK may be ANDed with a tag to query its number.
+#define CBS_ASN1_TAG_NUMBER_MASK ((1u << (5 + CBS_ASN1_TAG_SHIFT)) - 1)
+
+// CBS_get_asn1 sets |*out| to the contents of DER-encoded, ASN.1 element (not
+// including tag and length bytes) and advances |cbs| over it. The ASN.1
+// element must match |tag_value|. It returns one on success and zero
+// on error.
+OPENSSL_EXPORT int CBS_get_asn1(CBS *cbs, CBS *out, unsigned tag_value);
+
+// CBS_get_asn1_element acts like |CBS_get_asn1| but |out| will include the
+// ASN.1 header bytes too.
+OPENSSL_EXPORT int CBS_get_asn1_element(CBS *cbs, CBS *out, unsigned tag_value);
+
+// CBS_peek_asn1_tag looks ahead at the next ASN.1 tag and returns one
+// if the next ASN.1 element on |cbs| would have tag |tag_value|. If
+// |cbs| is empty or the tag does not match, it returns zero. Note: if
+// it returns one, CBS_get_asn1 may still fail if the rest of the
+// element is malformed.
+OPENSSL_EXPORT int CBS_peek_asn1_tag(const CBS *cbs, unsigned tag_value);
+
+// CBS_get_any_asn1 sets |*out| to contain the next ASN.1 element from |*cbs|
+// (not including tag and length bytes), sets |*out_tag| to the tag number, and
+// advances |*cbs|. It returns one on success and zero on error. Either of |out|
+// and |out_tag| may be NULL to ignore the value.
+OPENSSL_EXPORT int CBS_get_any_asn1(CBS *cbs, CBS *out, unsigned *out_tag);
+
+// CBS_get_any_asn1_element sets |*out| to contain the next ASN.1 element from
+// |*cbs| (including header bytes) and advances |*cbs|. It sets |*out_tag| to
+// the tag number and |*out_header_len| to the length of the ASN.1 header. Each
+// of |out|, |out_tag|, and |out_header_len| may be NULL to ignore the value.
+OPENSSL_EXPORT int CBS_get_any_asn1_element(CBS *cbs, CBS *out,
+ unsigned *out_tag,
+ size_t *out_header_len);
+
+// CBS_get_any_ber_asn1_element acts the same as |CBS_get_any_asn1_element| but
+// also allows indefinite-length elements to be returned. In that case,
+// |*out_header_len| and |CBS_len(out)| will both be two as only the header is
+// returned, otherwise it behaves the same as the previous function.
+OPENSSL_EXPORT int CBS_get_any_ber_asn1_element(CBS *cbs, CBS *out,
+ unsigned *out_tag,
+ size_t *out_header_len);
+
+// CBS_get_asn1_uint64 gets an ASN.1 INTEGER from |cbs| using |CBS_get_asn1|
+// and sets |*out| to its value. It returns one on success and zero on error,
+// where error includes the integer being negative, or too large to represent
+// in 64 bits.
+OPENSSL_EXPORT int CBS_get_asn1_uint64(CBS *cbs, uint64_t *out);
+
+// CBS_get_asn1_bool gets an ASN.1 BOOLEAN from |cbs| and sets |*out| to zero
+// or one based on its value. It returns one on success or zero on error.
+OPENSSL_EXPORT int CBS_get_asn1_bool(CBS *cbs, int *out);
+
+// CBS_get_optional_asn1 gets an optional explicitly-tagged element from |cbs|
+// tagged with |tag| and sets |*out| to its contents, or ignores it if |out| is
+// NULL. If present and if |out_present| is not NULL, it sets |*out_present| to
+// one, otherwise zero. It returns one on success, whether or not the element
+// was present, and zero on decode failure.
+OPENSSL_EXPORT int CBS_get_optional_asn1(CBS *cbs, CBS *out, int *out_present,
+ unsigned tag);
+
+// CBS_get_optional_asn1_octet_string gets an optional
+// explicitly-tagged OCTET STRING from |cbs|. If present, it sets
+// |*out| to the string and |*out_present| to one. Otherwise, it sets
+// |*out| to empty and |*out_present| to zero. |out_present| may be
+// NULL. It returns one on success, whether or not the element was
+// present, and zero on decode failure.
+OPENSSL_EXPORT int CBS_get_optional_asn1_octet_string(CBS *cbs, CBS *out,
+ int *out_present,
+ unsigned tag);
+
+// CBS_get_optional_asn1_uint64 gets an optional explicitly-tagged
+// INTEGER from |cbs|. If present, it sets |*out| to the
+// value. Otherwise, it sets |*out| to |default_value|. It returns one
+// on success, whether or not the element was present, and zero on
+// decode failure.
+OPENSSL_EXPORT int CBS_get_optional_asn1_uint64(CBS *cbs, uint64_t *out,
+ unsigned tag,
+ uint64_t default_value);
+
+// CBS_get_optional_asn1_bool gets an optional, explicitly-tagged BOOLEAN from
+// |cbs|. If present, it sets |*out| to either zero or one, based on the
+// boolean. Otherwise, it sets |*out| to |default_value|. It returns one on
+// success, whether or not the element was present, and zero on decode
+// failure.
+OPENSSL_EXPORT int CBS_get_optional_asn1_bool(CBS *cbs, int *out, unsigned tag,
+ int default_value);
+
+// CBS_is_valid_asn1_bitstring returns one if |cbs| is a valid ASN.1 BIT STRING
+// and zero otherwise.
+OPENSSL_EXPORT int CBS_is_valid_asn1_bitstring(const CBS *cbs);
+
+// CBS_asn1_bitstring_has_bit returns one if |cbs| is a valid ASN.1 BIT STRING
+// and the specified bit is present and set. Otherwise, it returns zero. |bit|
+// is indexed starting from zero.
+OPENSSL_EXPORT int CBS_asn1_bitstring_has_bit(const CBS *cbs, unsigned bit);
+
+// CBS_asn1_oid_to_text interprets |cbs| as DER-encoded ASN.1 OBJECT IDENTIFIER
+// contents (not including the element framing) and returns the ASCII
+// representation (e.g., "1.2.840.113554.4.1.72585") in a newly-allocated
+// string, or NULL on failure. The caller must release the result with
+// |OPENSSL_free|.
+OPENSSL_EXPORT char *CBS_asn1_oid_to_text(const CBS *cbs);
+
+
+// CRYPTO ByteBuilder.
+//
+// |CBB| objects allow one to build length-prefixed serialisations. A |CBB|
+// object is associated with a buffer and new buffers are created with
+// |CBB_init|. Several |CBB| objects can point at the same buffer when a
+// length-prefix is pending, however only a single |CBB| can be 'current' at
+// any one time. For example, if one calls |CBB_add_u8_length_prefixed| then
+// the new |CBB| points at the same buffer as the original. But if the original
+// |CBB| is used then the length prefix is written out and the new |CBB| must
+// not be used again.
+//
+// If one needs to force a length prefix to be written out because a |CBB| is
+// going out of scope, use |CBB_flush|. If an operation on a |CBB| fails, it is
+// in an undefined state and must not be used except to call |CBB_cleanup|.
+
+struct cbb_buffer_st {
+ uint8_t *buf;
+ size_t len; // The number of valid bytes.
+ size_t cap; // The size of buf.
+ char can_resize; /* One iff |buf| is owned by this object. If not then |buf|
+ cannot be resized. */
+ char error; /* One iff there was an error writing to this CBB. All future
+ operations will fail. */
+};
+
+struct cbb_st {
+ struct cbb_buffer_st *base;
+ // child points to a child CBB if a length-prefix is pending.
+ CBB *child;
+ // offset is the number of bytes from the start of |base->buf| to this |CBB|'s
+ // pending length prefix.
+ size_t offset;
+ // pending_len_len contains the number of bytes in this |CBB|'s pending
+ // length-prefix, or zero if no length-prefix is pending.
+ uint8_t pending_len_len;
+ char pending_is_asn1;
+ // is_top_level is true iff this is a top-level |CBB| (as opposed to a child
+ // |CBB|). Top-level objects are valid arguments for |CBB_finish|.
+ char is_top_level;
+};
+
+// CBB_zero sets an uninitialised |cbb| to the zero state. It must be
+// initialised with |CBB_init| or |CBB_init_fixed| before use, but it is safe to
+// call |CBB_cleanup| without a successful |CBB_init|. This may be used for more
+// uniform cleanup of a |CBB|.
+OPENSSL_EXPORT void CBB_zero(CBB *cbb);
+
+// CBB_init initialises |cbb| with |initial_capacity|. Since a |CBB| grows as
+// needed, the |initial_capacity| is just a hint. It returns one on success or
+// zero on error.
+OPENSSL_EXPORT int CBB_init(CBB *cbb, size_t initial_capacity);
+
+// CBB_init_fixed initialises |cbb| to write to |len| bytes at |buf|. Since
+// |buf| cannot grow, trying to write more than |len| bytes will cause CBB
+// functions to fail. It returns one on success or zero on error.
+OPENSSL_EXPORT int CBB_init_fixed(CBB *cbb, uint8_t *buf, size_t len);
+
+// CBB_cleanup frees all resources owned by |cbb| and other |CBB| objects
+// writing to the same buffer. This should be used in an error case where a
+// serialisation is abandoned.
+//
+// This function can only be called on a "top level" |CBB|, i.e. one initialised
+// with |CBB_init| or |CBB_init_fixed|, or a |CBB| set to the zero state with
+// |CBB_zero|.
+OPENSSL_EXPORT void CBB_cleanup(CBB *cbb);
+
+// CBB_finish completes any pending length prefix and sets |*out_data| to a
+// malloced buffer and |*out_len| to the length of that buffer. The caller
+// takes ownership of the buffer and, unless the buffer was fixed with
+// |CBB_init_fixed|, must call |OPENSSL_free| when done.
+//
+// It can only be called on a "top level" |CBB|, i.e. one initialised with
+// |CBB_init| or |CBB_init_fixed|. It returns one on success and zero on
+// error.
+OPENSSL_EXPORT int CBB_finish(CBB *cbb, uint8_t **out_data, size_t *out_len);
+
+// CBB_flush causes any pending length prefixes to be written out and any child
+// |CBB| objects of |cbb| to be invalidated. This allows |cbb| to continue to be
+// used after the children go out of scope, e.g. when local |CBB| objects are
+// added as children to a |CBB| that persists after a function returns. This
+// function returns one on success or zero on error.
+OPENSSL_EXPORT int CBB_flush(CBB *cbb);
+
+// CBB_data returns a pointer to the bytes written to |cbb|. It does not flush
+// |cbb|. The pointer is valid until the next operation to |cbb|.
+//
+// To avoid unfinalized length prefixes, it is a fatal error to call this on a
+// CBB with any active children.
+OPENSSL_EXPORT const uint8_t *CBB_data(const CBB *cbb);
+
+// CBB_len returns the number of bytes written to |cbb|. It does not flush
+// |cbb|.
+//
+// To avoid unfinalized length prefixes, it is a fatal error to call this on a
+// CBB with any active children.
+OPENSSL_EXPORT size_t CBB_len(const CBB *cbb);
+
+// CBB_add_u8_length_prefixed sets |*out_contents| to a new child of |cbb|. The
+// data written to |*out_contents| will be prefixed in |cbb| with an 8-bit
+// length. It returns one on success or zero on error.
+OPENSSL_EXPORT int CBB_add_u8_length_prefixed(CBB *cbb, CBB *out_contents);
+
+// CBB_add_u16_length_prefixed sets |*out_contents| to a new child of |cbb|.
+// The data written to |*out_contents| will be prefixed in |cbb| with a 16-bit,
+// big-endian length. It returns one on success or zero on error.
+OPENSSL_EXPORT int CBB_add_u16_length_prefixed(CBB *cbb, CBB *out_contents);
+
+// CBB_add_u24_length_prefixed sets |*out_contents| to a new child of |cbb|.
+// The data written to |*out_contents| will be prefixed in |cbb| with a 24-bit,
+// big-endian length. It returns one on success or zero on error.
+OPENSSL_EXPORT int CBB_add_u24_length_prefixed(CBB *cbb, CBB *out_contents);
+
+// CBB_add_asn1 sets |*out_contents| to a |CBB| into which the contents of an
+// ASN.1 object can be written. The |tag| argument will be used as the tag for
+// the object. It returns one on success or zero on error.
+OPENSSL_EXPORT int CBB_add_asn1(CBB *cbb, CBB *out_contents, unsigned tag);
+
+// CBB_add_bytes appends |len| bytes from |data| to |cbb|. It returns one on
+// success and zero otherwise.
+OPENSSL_EXPORT int CBB_add_bytes(CBB *cbb, const uint8_t *data, size_t len);
+
+// CBB_add_space appends |len| bytes to |cbb| and sets |*out_data| to point to
+// the beginning of that space. The caller must then write |len| bytes of
+// actual contents to |*out_data|. It returns one on success and zero
+// otherwise.
+OPENSSL_EXPORT int CBB_add_space(CBB *cbb, uint8_t **out_data, size_t len);
+
+// CBB_reserve ensures |cbb| has room for |len| additional bytes and sets
+// |*out_data| to point to the beginning of that space. It returns one on
+// success and zero otherwise. The caller may write up to |len| bytes to
+// |*out_data| and call |CBB_did_write| to complete the write. |*out_data| is
+// valid until the next operation on |cbb| or an ancestor |CBB|.
+OPENSSL_EXPORT int CBB_reserve(CBB *cbb, uint8_t **out_data, size_t len);
+
+// CBB_did_write advances |cbb| by |len| bytes, assuming the space has been
+// written to by the caller. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBB_did_write(CBB *cbb, size_t len);
+
+// CBB_add_u8 appends an 8-bit number from |value| to |cbb|. It returns one on
+// success and zero otherwise.
+OPENSSL_EXPORT int CBB_add_u8(CBB *cbb, uint8_t value);
+
+// CBB_add_u16 appends a 16-bit, big-endian number from |value| to |cbb|. It
+// returns one on success and zero otherwise.
+OPENSSL_EXPORT int CBB_add_u16(CBB *cbb, uint16_t value);
+
+// CBB_add_u24 appends a 24-bit, big-endian number from |value| to |cbb|. It
+// returns one on success and zero otherwise.
+OPENSSL_EXPORT int CBB_add_u24(CBB *cbb, uint32_t value);
+
+// CBB_add_u32 appends a 32-bit, big-endian number from |value| to |cbb|. It
+// returns one on success and zero otherwise.
+OPENSSL_EXPORT int CBB_add_u32(CBB *cbb, uint32_t value);
+
+// CBB_discard_child discards the current unflushed child of |cbb|. Neither the
+// child's contents nor the length prefix will be included in the output.
+OPENSSL_EXPORT void CBB_discard_child(CBB *cbb);
+
+// CBB_add_asn1_uint64 writes an ASN.1 INTEGER into |cbb| using |CBB_add_asn1|
+// and writes |value| in its contents. It returns one on success and zero on
+// error.
+OPENSSL_EXPORT int CBB_add_asn1_uint64(CBB *cbb, uint64_t value);
+
+// CBB_add_asn1_octet_string writes an ASN.1 OCTET STRING into |cbb| with the
+// given contents. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBB_add_asn1_octet_string(CBB *cbb, const uint8_t *data,
+ size_t data_len);
+
+// CBB_add_asn1_bool writes an ASN.1 BOOLEAN into |cbb| which is true iff
+// |value| is non-zero. It returns one on success and zero on error.
+OPENSSL_EXPORT int CBB_add_asn1_bool(CBB *cbb, int value);
+
+// CBB_add_asn1_oid_from_text decodes |len| bytes from |text| as an ASCII OID
+// representation, e.g. "1.2.840.113554.4.1.72585", and writes the DER-encoded
+// contents to |cbb|. It returns one on success and zero on malloc failure or if
+// |text| was invalid. It does not include the OBJECT IDENTIFER framing, only
+// the element's contents.
+//
+// This function considers OID strings with components which do not fit in a
+// |uint64_t| to be invalid.
+OPENSSL_EXPORT int CBB_add_asn1_oid_from_text(CBB *cbb, const char *text,
+ size_t len);
+
+// CBB_flush_asn1_set_of calls |CBB_flush| on |cbb| and then reorders the
+// contents for a DER-encoded ASN.1 SET OF type. It returns one on success and
+// zero on failure. DER canonicalizes SET OF contents by sorting
+// lexicographically by encoding. Call this function when encoding a SET OF
+// type in an order that is not already known to be canonical.
+//
+// Note a SET type has a slightly different ordering than a SET OF.
+OPENSSL_EXPORT int CBB_flush_asn1_set_of(CBB *cbb);
+
+
+#if defined(__cplusplus)
+} // extern C
+
+
+#if !defined(BORINGSSL_NO_CXX)
+extern "C++" {
+
+namespace bssl {
+
+using ScopedCBB = internal::StackAllocated<CBB, void, CBB_zero, CBB_cleanup>;
+
+} // namespace bssl
+
+} // extern C++
+#endif
+
+#endif
+
+#endif // OPENSSL_HEADER_BYTESTRING_H
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