tzhash/cmd/homo/main.go

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2018-12-29 13:04:17 +00:00
package main
import (
"bufio"
"encoding/hex"
"flag"
"fmt"
"os"
"github.com/TrueCloudLab/tzhash/tz"
2018-12-29 13:04:17 +00:00
)
var (
concat = flag.Bool("concat", false, "Concatenate hashes")
filename = flag.String("file", "", "File to read from")
)
func main() {
var (
err error
file = os.Stdin
lines = make([]string, 0, 10)
)
flag.Parse()
if *filename != "" {
if file, err = os.Open(*filename); err != nil {
fatal("error while opening file: %v", err)
}
}
for f := bufio.NewScanner(file); f.Scan(); {
lines = append(lines, f.Text())
}
if *concat {
var (
h []byte
hashes = make([][]byte, len(lines))
)
for i := range lines {
if hashes[i], err = hex.DecodeString(lines[i]); err != nil {
fatal("error while decoding hex-string: %v", err)
}
}
h, err := tz.Concat(hashes)
if err != nil {
fatal("error while concatenating hashes: %v", err)
}
fmt.Println(hex.EncodeToString(h))
return
}
for i := range lines {
h := tz.Sum([]byte(lines[i]))
fmt.Println(hex.EncodeToString(h[:]))
}
}
func fatal(msg string, args ...interface{}) {
fmt.Printf(msg+"\n", args...)
os.Exit(1)
}