71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package securerandom
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import (
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"bytes"
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"crypto/rand"
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"encoding/base64"
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"strings"
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)
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func RandomBytes(n int) ([]byte, error) {
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bytes := make([]byte, n)
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_, err := rand.Read(bytes)
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if err != nil {
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return nil, err
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}
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return bytes, nil
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}
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func Base64(n int, padded bool) (string, error) {
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bytes, err := RandomBytes(n)
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if err != nil {
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return "", err
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}
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result := base64.StdEncoding.EncodeToString(bytes)
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result = strings.Replace(result, "\n", "", -1)
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if !padded {
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result = strings.Replace(result, "=", "", -1)
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}
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return result, nil
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}
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func UrlSafeBase64(n int, padded bool) (string, error) {
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result, err := Base64(n, padded)
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if err != nil {
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return "", err
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}
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result = strings.Replace(result, "+", "-", -1)
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result = strings.Replace(result, "/", "_", -1)
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return result, nil
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}
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func Hex(n int) (string, error) {
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bytes, err := RandomBytes(n)
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if err != nil {
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return "", err
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}
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return hex.EncodeToString(bytes), nil
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}
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func Uuid() (string, error) {
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var first, last uint32
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var middle [4]uint16
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randomBytes, err := RandomBytes(16)
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if err != nil {
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return "", err
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}
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buffer := bytes.NewBuffer(randomBytes)
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binary.Read(buffer, binary.BigEndian, &first)
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for i := 0; i < 4; i++ {
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binary.Read(buffer, binary.BigEndian, &middle[i])
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}
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binary.Read(buffer, binary.BigEndian, &last)
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middle[1] = (middle[1] & 0x0fff) | 0x4000
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middle[2] = (middle[2] & 0x3fff) | 0x8000
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return fmt.Sprintf("%08x-%04x-%04x-%04x-%04x%08x",
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first, middle[0], middle[1], middle[2], middle[3], last), nil
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}
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