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package main
import (
"encoding/hex"
"flag"
"fmt"
"golang.org/x/crypto/sha3"
"hash"
"io"
"os"
)
var (
algo = flag.String("algo", "256", "Which algo should be used (224,256,384,512)")
)
var algos = map[string]func() hash.Hash{
"256": sha3.New256,
"224": sha3.New224,
"384": sha3.New384,
"512": sha3.New512,
}
func main() {
flag.Parse()
files := append([]string{}, flag.Args()...)
if len(files) == 0 {
files = append(files, "-")
}
for _, fn := range files {
if !doFile(fn) {
os.Exit(1)
}
}
}
func doFile(fn string) bool {
var r io.Reader
if fn == "-" {
r = os.Stdin
} else {
f, err := os.Open(fn)
if err != nil {
fmt.Fprintln(os.Stderr, err)
return false
}
defer f.Close()
r = f
}
gethash, ok := algos[*algo]
if !ok {
fmt.Fprintf(os.Stderr, "Unknown algo: %s\n", *algo)
return false
}
hash := gethash()
if _, err := io.Copy(hash, r); err != nil {
fmt.Fprintln(os.Stderr, err)
return false
}
fmt.Printf("%s %s\n", hex.EncodeToString(hash.Sum([]byte{})), fn)
return true
}
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