init
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commit
e523a510e1
20
license
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20
license
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MIT License
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Copyright (c) 2015 smcquay
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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55
main.go
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55
main.go
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package main
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import (
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"crypto/sha1"
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"crypto/sha256"
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"crypto/sha512"
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"flag"
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"fmt"
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"io"
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"os"
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)
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var algo = flag.String("a", "sha256", "algorithm to use")
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func main() {
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flag.Parse()
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files := flag.Args()
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h := sha256.New()
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switch *algo {
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case "sha1", "1":
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h = sha1.New()
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case "sha256", "256":
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h = sha256.New()
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case "sha512", "512":
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h = sha512.New()
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default:
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fmt.Fprintf(os.Stderr, "unsupported algorithm: %v\n", *algo)
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os.Exit(1)
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}
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if len(files) == 0 {
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_, err := io.Copy(h, os.Stdin)
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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os.Exit(1)
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}
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fmt.Printf("%x -\n", h.Sum(nil))
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} else {
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for _, name := range files {
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f, err := os.Open(name)
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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continue
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}
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h.Reset()
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_, err = io.Copy(h, f)
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f.Close()
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if err != nil {
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fmt.Fprintf(os.Stderr, "%v\n", err)
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continue
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}
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fmt.Printf("%x %s\n", h.Sum(nil), name)
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}
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}
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}
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