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simulator: add support for GetRNG #4247

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merged 1 commit into from Apr 28, 2024
Merged

simulator: add support for GetRNG #4247

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14 changes: 14 additions & 0 deletions src/machine/machine_generic.go
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Expand Up @@ -2,6 +2,10 @@

package machine

import (
"crypto/rand"
)

// Dummy machine package that calls out to external functions.

const deviceName = "generic"
Expand Down Expand Up @@ -243,3 +247,13 @@ var (
sercomSPIM6 = SPI{6}
sercomSPIM7 = SPI{7}
)

// GetRNG returns 32 bits of random data from the WASI random source.
func GetRNG() (uint32, error) {
var buf [4]byte
_, err := rand.Read(buf[:])
if err != nil {
return 0, err
}
return uint32(buf[0])<<0 | uint32(buf[1])<<8 | uint32(buf[2])<<16 | uint32(buf[3])<<24, nil
}