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Add documentation for mbedtls_psa_hkdf_extract

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Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
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Gabor Mezei 2022-02-07 18:18:16 +01:00
parent 62bf024025
commit b1f53976ee
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22
library/ssl_tls13_invasive.h
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@ -28,6 +28,28 @@
#if defined(MBEDTLS_PSA_CRYPTO_C)
/**
* \brief Take the input keying material \p ikm and extract from it a
* fixed-length pseudorandom key \p prk.
*
* \param alg A hash function.
* \param salt An optional salt value (a non-secret random value);
* if the salt is not provided, a string of all zeros
* of the length of the hash provided by \p alg is used
* as the salt.
* \param salt_len The length in bytes of the optional \p salt.
* \param ikm The input keying material.
* \param ikm_len The length in bytes of \p ikm.
* \param[out] prk A pseudorandom key of \p prk_len bytes.
* \param prk_size Size of the \p prk buffer in bytes.
* \param[out] prk_len On success, the length in bytes of the
* pseudorandom key in \p prk.
*
* \return 0 on success.
* \return #MBEDTLS_ERR_HKDF_BAD_INPUT_DATA when the parameters are invalid.
* \return An PSA_ERROR_* error for errors returned from the underlying
* PSA layer.
*/
psa_status_t mbedtls_psa_hkdf_extract( psa_algorithm_t alg,
const unsigned char *salt, size_t salt_len,
const unsigned char *ikm, size_t ikm_len,