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package main

import (
    "crypto/rand"
    "crypto/sha1"
    "encoding/base64"
    "encoding/hex"
    "fmt"
    "io"
)

func newUUID() string {
    var b [16]byte
    if _, err := io.ReadFull(rand.Reader, b[:]); err != nil {
        panic(err)
    }
    b[6] = (b[6] & 0x0f) | 0x40 // version 4
    b[8] = (b[8] & 0x3f) | 0x80 // variant RFC 4122
    return fmt.Sprintf("%08x-%04x-%04x-%04x-%012x",
        b[0:4], b[4:6], b[6:8], b[8:10], b[10:16])
}

func hashSHA1(s string) string {
    h := sha1.Sum([]byte(s))
    return hex.EncodeToString(h[:])
}

func encodeB64(s string) string {
    return base64.StdEncoding.EncodeToString([]byte(s))
}

func decodeB64(s string) string {
    b, err := base64.StdEncoding.DecodeString(s)
    if err != nil {
        return "[decode error]"
    }
    return string(b)
}