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