This commit is contained in:
Stephen McQuay 2015-12-08 10:18:42 -08:00
commit e523a510e1
3 changed files with 87 additions and 0 deletions

20
license Normal file
View File

@ -0,0 +1,20 @@
MIT License
Copyright (c) 2015 smcquay
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is furnished to do
so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

55
main.go Normal file
View File

@ -0,0 +1,55 @@
package main
import (
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"flag"
"fmt"
"io"
"os"
)
var algo = flag.String("a", "sha256", "algorithm to use")
func main() {
flag.Parse()
files := flag.Args()
h := sha256.New()
switch *algo {
case "sha1", "1":
h = sha1.New()
case "sha256", "256":
h = sha256.New()
case "sha512", "512":
h = sha512.New()
default:
fmt.Fprintf(os.Stderr, "unsupported algorithm: %v\n", *algo)
os.Exit(1)
}
if len(files) == 0 {
_, err := io.Copy(h, os.Stdin)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
fmt.Printf("%x -\n", h.Sum(nil))
} else {
for _, name := range files {
f, err := os.Open(name)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
continue
}
h.Reset()
_, err = io.Copy(h, f)
f.Close()
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
continue
}
fmt.Printf("%x %s\n", h.Sum(nil), name)
}
}
}

12
readme.md Normal file
View File

@ -0,0 +1,12 @@
# cs
calculate checksums
It's a simpler version of shasum + md5sum, but only for sha1, sha256, and
sha512.
## usage
cs -a 256 < foo.txt
cs foo.txt
cs -a sha1 foo.txt foo.txt foo.txt