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bazel-lib/tools/sha256sum/main.go

33 lines
467 B
Go

package main
import (
"crypto/sha256"
"fmt"
"io"
"log"
"os"
)
func main() {
var input io.Reader
var filename string
if len(os.Args) == 1 {
input = os.Stdin
filename = "-"
} else {
f, err := os.Open(os.Args[1])
if err != nil {
log.Fatal(err)
}
defer f.Close()
input = f
filename = os.Args[1]
}
hash := sha256.New()
if _, err := io.Copy(hash, input); err != nil {
log.Fatal(err)
}
fmt.Printf("%x %s\n", hash.Sum(nil), filename)
}