Function get_random 

pub fn get_random() -> Status

Get random seed from the Sentry kernel RNG backend

Usage

The random seed received is 32 bits length. If the caller needs to forge a longer seeds without using an application hosted derivation, the syscall need to be called multiple-time.

This syscall requires the caller to hold the CAP_CRY_KRNG capability. Without this capability, Status::Denied is returned.

The syscall may fail if the kernel RNG source fails to properly delivers a FIPS compliant random value. In that case, the syscall returns Status::Critical.

The generated seed is delivered through the SVC_EXCHANGE zone.

Example

match (get_random()) {
    Status::Ok => (),
    any_err => return(any_err),
};