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main.go
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main.go
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package main
import (
"flag"
"fmt"
"os"
"strconv"
"github.com/kechako/scramble"
)
func parseNumber(s string, bits int, hex bool) (salt uint64, err error) {
if hex {
salt, err = strconv.ParseUint(s, 16, bits)
} else {
salt, err = strconv.ParseUint(s, 10, bits)
}
return
}
func scrambleNumber(bits int, hex bool, args []string) (int, error) {
if len(args) < 1 {
fmt.Fprintln(os.Stderr, "scramble salt is not specified.")
return 2, nil
}
salt, err := parseNumber(args[0], bits, hex)
if err != nil {
if nerr, ok := err.(*strconv.NumError); ok {
fmt.Fprintf(os.Stderr, "scramble salt is not valid : %v\n", nerr.Err)
} else {
fmt.Fprintln(os.Stderr, "scramble salt is not valid.")
}
return 2, nil
}
if salt&0x01 == 0 {
fmt.Fprintln(os.Stderr, "scramble salt is not an odd.")
return 2, nil
}
if len(args) < 2 {
fmt.Fprintln(os.Stderr, "number that will be scrambled is not specified.")
return 2, nil
}
num, err := parseNumber(args[1], bits, hex)
if err != nil {
if nerr, ok := err.(*strconv.NumError); ok {
fmt.Fprintf(os.Stderr, "number that will be scrabled not valid : %v\n", nerr.Err)
} else {
fmt.Fprintln(os.Stderr, "number that will be scrabled is not valid.")
}
return 2, nil
}
var scrambled uint64
switch bits {
case 8:
s := scramble.NewScrambler8WithSalt(uint8(salt))
scrambled = uint64(s.Scramble(uint8(num)))
case 16:
s := scramble.NewScrambler16WithSalt(uint16(salt))
scrambled = uint64(s.Scramble(uint16(num)))
case 32:
s := scramble.NewScrambler32WithSalt(uint32(salt))
scrambled = uint64(s.Scramble(uint32(num)))
case 64:
s := scramble.NewScrambler64WithSalt(salt)
scrambled = s.Scramble(num)
}
var format string
if hex {
format = fmt.Sprintf("%%0%dx\n", bits/4)
} else {
format = "%d\n"
}
fmt.Printf(format, scrambled)
return 0, nil
}
func generateSalt(bits int, hex bool) (int, error) {
var salt uint64
switch bits {
case 8:
s, _ := scramble.GenRandomSalt8()
salt = uint64(s)
case 16:
s, _ := scramble.GenRandomSalt16()
salt = uint64(s)
case 32:
s, _ := scramble.GenRandomSalt32()
salt = uint64(s)
case 64:
salt, _ = scramble.GenRandomSalt64()
}
var format string
if hex {
format = fmt.Sprintf("%%0%dx\n", bits/4)
} else {
format = "%d\n"
}
fmt.Printf(format, salt)
return 0, nil
}
func main() {
var bits int
var genSalt bool
var hex bool
flag.IntVar(&bits, "bits", 32, "value bits. [8, 16, 32, 64]")
flag.BoolVar(&genSalt, "gen", false, "generate scramble salt.")
flag.BoolVar(&hex, "hex", false, "use hexadecimal numbers.")
flag.Usage = func() {
fmt.Fprintf(os.Stderr, `Usage : %s [options] [salt] [number]
parameters:
salt
scramble salt.
number
number that will be scrambled.
options:
`, os.Args[0])
flag.PrintDefaults()
}
flag.Parse()
switch bits {
case 8, 16, 32, 64:
// ok
default:
fmt.Fprintln(os.Stderr, "value bits is invalid.")
os.Exit(2)
}
var code int
var err error
if genSalt {
code, err = generateSalt(bits, hex)
} else {
code, err = scrambleNumber(bits, hex, flag.Args())
}
if err != nil {
fmt.Fprintf(os.Stderr, "Error : %v\n", err)
}
if code == 2 {
flag.Usage()
}
if code != 0 {
os.Exit(code)
}
}