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random.go
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package reddistlock
import (
"crypto/rand"
"fmt"
"io"
)
func init() {
assertAvailablePRNG()
}
func assertAvailablePRNG() {
// Assert that a cryptographically secure PRNG is available.
// Panic otherwise.
buf := make([]byte, 1)
_, err := io.ReadFull(rand.Reader, buf)
if err != nil {
panic(fmt.Sprintf("crypto/rand is unavailable: Read() failed with %#v", err))
}
}
// GenerateRandomBytes returns securely generated random bytes.
// It will return an error if the system's secure random
// number generator fails to function correctly, in which
// case the caller should not continue.
func generateRandomBytes(n int) ([]byte, error) {
b := make([]byte, n)
_, err := rand.Read(b)
// Note that err == nil only if we read len(b) bytes.
if err != nil {
return nil, err
}
return b, nil
}