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18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
43  * variable length output, meant to be used to derive subkeys from a
51  * for the HMAC implementation (i.e. output size is 64 bytes or less, hash
55  *  - HKDF-Extract: the input data in ingested, along with a "salt" value.
57  *  - HKDF-Expand: the output is produced, from the result of processing
58  *    the input and salt, and using an extra non-secret parameter called
61  * The "salt" and "info" strings are non-secret and can be empty. Their role
62  * is normally to bind the input and output, respectively, to conventional
67  *  - `br_hkdf_init()`: initialize an HKDF context, with a hash function,
68  *    and the salt. This starts the HKDF-Extract process.
70  *  - `br_hkdf_inject()`: inject more input bytes. This function may be
73  *  - `br_hkdf_flip()`: end the HKDF-Extract process, and start the
74  *    HKDF-Expand process.
76  *  - `br_hkdf_produce()`: get the next bytes of output. This function
77  *    may be called several times to obtain the full output by chunks.
81  * Note that the HKDF total output size (the number of bytes that
82  * HKDF-Expand is willing to produce) is limited: if the hash output size
83  * is _n_ bytes, then the maximum output size is _255*n_.
97  *  - `br_shake_init()`: initialize a SHAKE context for a given
100  *  - `br_shake_inject()`: inject more input bytes. This function may be
103  *  - `br_shake_flip()`: end the data injection process, and start the
106  *  - `br_shake_produce()`: get the next bytes of output. This function
107  *    may be called several times to obtain the full output by chunks.
116  * appropriate. Context initialisation and usage incurs no dynamic
117  * allocation, so there is no release function.
140  * bytes of value zero, of the same length as the hash function output).
147  * \param salt            HKDF-Extract salt.
148  * \param salt_len        HKDF-Extract salt length (in bytes).
163  * \brief HKDF input injection (HKDF-Extract).
176  * \brief HKDF switch to the HKDF-Expand phase.
178  * This call terminates the HKDF-Extract process (input injection), and
179  * starts the HKDF-Expand process (output production).
186  * \brief HKDF output production (HKDF-Expand).
188  * Produce more output bytes from the current state. This function may be
192  * output length is limited to 255 times the output length of the
198  * \param out        destination buffer for the HKDF output.
199  * \param out_len    the length of the requested output (in bytes).
200  * \return  the produced output length (in bytes).
213  * appropriate. Context initialisation and usage incurs no dynamic
214  * allocation, so there is no release function.
231  * which corresponds to a 256-bit capacity.
260  * output production process.
267  * \brief SHAKE output production.
269  * Produce more output bytes from the current state. This function may be
272  * There is no practical limit to the number of bytes that may be produced.
275  * \param out   destination buffer for the SHAKE output.
276  * \param len   the length of the requested output (in bytes).