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Clarify statuses from mbedtls_psa_external_get_random

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Add and document PSA_ERROR_INSUFFICIENT_ENTROPY.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-11-30 12:08:00 +01:00
parent b0a748e340
commit e995b9b3f0
1 changed files with 13 additions and 0 deletions
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13
include/psa/crypto_extra.h
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@ -678,7 +678,20 @@ mbedtls_ecp_group_id mbedtls_ecc_group_of_psa( psa_ecc_family_t curve,
* \param[out] output_length On success, set this value to \p output_size.
*
* \retval #PSA_SUCCESS
* Success. The output buffer contains \p output_size bytes of
* cryptographic-quality random data, and \c *output_length is
* set to \p output_size.
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* The random generator requires extra entropy and there is no
* way to obtain entropy under current environment conditions.
* This error should not happen under normal circumstances since
* this function is responsible for obtaining as much entropy as
* it needs. However implementations of this function may return
* #PSA_ERROR_INSUFFICIENT_ENTROPY if there is no way to obtain
* entropy without blocking indefinitely.
* \retval #PSA_ERROR_HARDWARE_FAILURE
* A failure of the random generator hardware that isn't covered
* by #PSA_ERROR_INSUFFICIENT_ENTROPY.
*/
psa_status_t mbedtls_psa_external_get_random(
mbedtls_psa_external_random_context_t *context,