clean up readme, add example

examples/xmldsig.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/crewjam/go-xmlsec/xmldsig"
+)
+
+func main() {
+	doVerify := flag.Bool("v", false, "verify the document")
+	doSign := flag.Bool("s", false, "sign the document")
+	keyPath := flag.String("k", "", "the path to the key")
+	flag.Parse()
+
+	if !*doVerify && !*doSign {
+		fmt.Println("you must specify -v to verify or -s to sign")
+		os.Exit(1)
+	}
+	if *keyPath == "" {
+		fmt.Println("you must specify a key file")
+		os.Exit(1)
+	}
+
+	key, err := ioutil.ReadFile(*keyPath)
+	if err != nil {
+		fmt.Printf("%s\n", err)
+		os.Exit(1)
+	}
+
+	buf, err := ioutil.ReadAll(os.Stdin)
+
+	if *doSign {
+		signedBuf, err := xmldsig.Sign(key, string(buf))
+		if err != nil {
+			fmt.Printf("%s\n", err)
+			os.Exit(1)
+		}
+		fmt.Print(signedBuf)
+	}
+
+	if *doVerify {
+		err := xmldsig.Verify(key, string(buf))
+		if err == xmldsig.ErrVerificationFailed {
+			fmt.Println("signature is not correct")
+			os.Exit(1)
+		}
+		if err != nil {
+			fmt.Printf("error: %s\n", err)
+			os.Exit(1)
+		}
+		fmt.Println("signature is correct")
+	}
+}