Function psa_random_set_prediction_resistance 

pub unsafe extern "C" fn psa_random_set_prediction_resistance(
    enabled: c_uint,
) -> psa_status_t

Enable or disable prediction resistance in the PSA random generator.

When prediction resistance is enabled, the random generator injects extra entropy before each request regardless of its size. As a consequence, a temporary compromise of the random generator state does not, by itself, compromise future steps. Furthermore, duplicating the random generator state (because the running application instance is cloned) is safe since it will not lead to identical random generator outputs in the clones.

When prediction resistance is disabled, the random generator injects extra entropy periodically only as determined by #MBEDTLS_CTR_DRBG_RESEED_INTERVAL if #MBEDTLS_CTR_DRBG_C is enabled, or #MBEDTLS_HMAC_DRBG_RESEED_INTERVAL otherwise.

Prediction resistance is disabled by default, although setting #MBEDTLS_CTR_DRBG_RESEED_INTERVAL or #MBEDTLS_HMAC_DRBG_RESEED_INTERVAL to \c 1 satisfies the prediction resistance property even when the option is disabled.

\note This function has no effect when #MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG is enabled.

\note Prediction resistance cannot be enabled when the only entropy source is a nonvolatile seed, since prediction resistance is effectively impossible to achieve without actual entropy.

\param enabled \c 1 to enable prediction resistance. \c 0 to disable prediction resistance.

\retval #PSA_SUCCESS The PSA random generator is active, and prediction resistance has been changed to the desired option. \retval #PSA_ERROR_BAD_STATE The PSA random generator is not active. \retval #PSA_ERROR_INVALID_ARGUMENT \p enabled is not valid. \retval #PSA_ERROR_NOT_SUPPORTED PSA uses an external random generator because the compilation option #MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG is enabled. Or, the random generator only has a nonvolatile seed but no entropy source, and prediction resistance has been requested.