PWGen/pwgenerator/funcs_cryptoshuffer.go

28 lines
615 B
Go

package pwgenerator
import (
"crypto/rand"
"encoding/binary"
)
// Int63 is used to interface as a *(math/rand).Rand but backed with a cryptographically sound generation.
func (c *cryptoShuffler) Int63() (i int64) {
var b [8]byte
_, _ = rand.Read(b[:])
// Mask is used to ensure a positive number.
i = int64(binary.LittleEndian.Uint64(b[:]) & (1<<63 - 1))
return
}
// Seed is used to interface as a *(math/rand).Rand.
func (c *cryptoShuffler) Seed(_ int64) {
// It's 100% OK that this is a no-op because we seed from the crypto methodology itself within cryptoShuffler.Int63 on each call.
return
}