From e7f1f3541fc94fd9b323be2cfe68a8ad3363aae0 Mon Sep 17 00:00:00 2001
From: Andrew Ekstedt <andrew.ekstedt@gmail.com>
Date: Wed, 31 Dec 2014 23:32:14 -0800
Subject: [PATCH] Add a simple sha3sum utility.

---
 sha3sum/main.go | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 sha3sum/main.go

diff --git a/sha3sum/main.go b/sha3sum/main.go
new file mode 100644
index 0000000..63127a6
--- /dev/null
+++ b/sha3sum/main.go
@@ -0,0 +1,33 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"os"
+
+	"github.com/magical/keccak"
+)
+
+func main() {
+	flag.Parse()
+	var sum [keccak.Size]byte
+	h := keccak.New256()
+	files := flag.Args()
+	for _, filename := range files {
+		f, err := os.Open(filename)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			continue
+		}
+		h.Reset()
+		_, err = io.Copy(h, f)
+		f.Close()
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			continue
+		}
+		h.Sum(sum[:0])
+		fmt.Printf("%x %s\n", sum, filename)
+	}
+}