25 lines
664 B
Go
25 lines
664 B
Go
package random
|
|
|
|
import (
|
|
"crypto/rand"
|
|
"encoding/binary"
|
|
"math/big"
|
|
|
|
"golang.org/x/exp/constraints"
|
|
)
|
|
|
|
// Int64N returns a random int64 between 0 and max.
|
|
// This is a reimplementation of math/rand/v2.Int64N using a cryptographically secure random number generator.
|
|
func Int64N[T constraints.Integer](max T) int64 {
|
|
rnd, _ := rand.Int(rand.Reader, big.NewInt(int64(max)))
|
|
return rnd.Int64()
|
|
}
|
|
|
|
// Uint64 returns a random uint64.
|
|
// This is a reimplementation of math/rand/v2.Uint64 using a cryptographically secure random number generator.
|
|
func Uint64() uint64 {
|
|
buffer := make([]byte, 8)
|
|
_, _ = rand.Read(buffer)
|
|
return binary.BigEndian.Uint64(buffer)
|
|
}
|