Initial commit

main.go

+package main
+
+import (
+	"crypto"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	jose "gopkg.in/square/go-jose.v1"
+)
+
+func exitOnError(err error, msg string) {
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%s: %s\n", msg, err)
+		os.Exit(1)
+	}
+}
+
+func main() {
+
+	data, err := ioutil.ReadAll(os.Stdin)
+	exitOnError(err, "unable to read stdin")
+
+	jws, err := jose.ParseSigned(string(data))
+	exitOnError(err, "unable to parse signed JWS")
+
+	b, err := jws.Verify(jws.Signatures[0].Header.JsonWebKey)
+	exitOnError(err, "unable to verify JWS")
+
+	fmt.Println("---[ Payload ]-----------------------------------------------------")
+	fmt.Printf("%s\n", indent(b))
+
+	fmt.Println("---[ Signatures ]--------------------------------------------------")
+	for _, signature := range jws.Signatures {
+		jwk := signature.Header.JsonWebKey
+		b, err = jwk.MarshalJSON()
+		exitOnError(err, "unable to marshal JWK to JSON")
+		fmt.Printf("SHA256 %s\n%s\n", thumbprint(jwk), indent(b))
+	}
+
+}
+
+func indent(b []byte) string {
+	var m map[string]interface{}
+	err := json.Unmarshal(b, &m)
+	exitOnError(err, "payload is not JSON")
+	b, err = json.MarshalIndent(m, "", "  ")
+	exitOnError(err, "unable to marshal to JSON")
+	return string(b)
+}
+
+func thumbprint(key *jose.JsonWebKey) string {
+	b, err := key.Thumbprint(crypto.SHA256)
+	exitOnError(err, "unable to get thumbprint")
+	return hex.EncodeToString(b)
+}

test.jws

+eyJhbGciOiJFUzI1NiIsImp3ayI6eyJrdHkiOiJFQyIsImNydiI6IlAtMjU2IiwieCI6Imw3N0lRVExQU2NuM3hXcHJYNnYwZ3I5bGtKUEMzdVpWT2k1ZHRmSDVOVUkiLCJ5IjoibHVCWXZ4b2t0QzlBUHdGUC1ZUy1mY01lWTR6bFp4T2M1ZkVCMVg3UGMtSSJ9LCJraWQiOiJUQlkxQy1TekJqLWZ0N3RtOGVIUUFfZFRiXzcwbVRhOXRQNXRfQXBFUmNNPSJ9.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.dRhCTwbUv5g2k3PZ7fQEvJGXddJgH-ufVmeg9eHkcBJshpU6uiSk9ujvao53vRDpG25Z7RMhXHH102fubYLkGQ
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