crypto/rand

Package rand implements a cryptographically secure random number generator.

API

func Int(rand io.Reader, max *big.Int) (n *big.Int, err error)
func Prime(rand io.Reader, bits int) (p *big.Int, err error)
func Read(b []byte) (n int, err error)

example

package utils

import (
    "crypto/rand"
    "fmt"
    "io"
)

func NewUUID() (string, error) {
    uuid := make([]byte, 16)
    n, err := io.ReadFull(rand.Reader, uuid)
    if n != len(uuid) || err != nil {
        return "", err
    }
    // variant bits; see section 4.1.1
    uuid[8] = uuid[8]&^0xc0 | 0x80
    // version 4 (pseudo-random); see section 4.1.3
    uuid[6] = uuid[6]&^0xf0 | 0x40
    return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:]), nil
}