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@deadprogram
Created January 17, 2023 06:42
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// NOT true random number generation on RP2040 but good enough for quick demos.
// Do not use in important production systems.
// Seriously, don't.
package main
import (
"machine"
"crypto/rand"
)
func init() {
rand.Reader = &reader{}
}
type reader struct {}
func (r *reader) Read(b []byte) (n int, err error) {
if len(b) == 0 {
return
}
var randomByte uint32
for i := range b {
if i%4 == 0 {
randomByte, err = machine.GetRNG()
if err != nil {
return n, err
}
} else {
randomByte >>= 8
}
b[i] = byte(randomByte)
}
return len(b), nil
}
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