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Clarify statuses from mbedtls_psa_external_get_random
Add and document PSA_ERROR_INSUFFICIENT_ENTROPY. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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@ -678,7 +678,20 @@ mbedtls_ecp_group_id mbedtls_ecc_group_of_psa( psa_ecc_family_t curve,
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* \param[out] output_length On success, set this value to \p output_size.
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*
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* \retval #PSA_SUCCESS
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* Success. The output buffer contains \p output_size bytes of
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* cryptographic-quality random data, and \c *output_length is
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* set to \p output_size.
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* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
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* The random generator requires extra entropy and there is no
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* way to obtain entropy under current environment conditions.
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* This error should not happen under normal circumstances since
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* this function is responsible for obtaining as much entropy as
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* it needs. However implementations of this function may return
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* #PSA_ERROR_INSUFFICIENT_ENTROPY if there is no way to obtain
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* entropy without blocking indefinitely.
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* \retval #PSA_ERROR_HARDWARE_FAILURE
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* A failure of the random generator hardware that isn't covered
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* by #PSA_ERROR_INSUFFICIENT_ENTROPY.
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*/
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psa_status_t mbedtls_psa_external_get_random(
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mbedtls_psa_external_random_context_t *context,
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