1 files changed, 22 insertions, 3 deletions
diff --git a/cmd/sigsum-debug/util.go b/cmd/sigsum-debug/util.go
index d7ba6a8..8d2cd4e 100644
--- a/cmd/sigsum-debug/util.go
+++ b/cmd/sigsum-debug/util.go
@@ -1,24 +1,43 @@
 package main
 
 import (
+	"crypto"
 	"bytes"
 	"fmt"
 	"io/ioutil"
 	"os"
+	"crypto/ed25519"
 
 	"git.sigsum.org/sigsum-lib-go/pkg/hex"
 )
 
-func decodeHexFromStdin() ([]byte, error) {
+func readStdin() ([]byte, error) {
 	b, err := ioutil.ReadAll(os.Stdin)
 	if err != nil {
-		return nil, fmt.Errorf("failed reading stdin: %v", err)
+		return nil, fmt.Errorf("stdin: %v", err)
 	}
+	return b, nil
+}
 
+func decodeHexFromStdin() ([]byte, error) {
+	b, err := readStdin()
+	if err != nil {
+		return nil, fmt.Errorf("failed reading stdin: %v", err)
+	}
 	b, err = hex.Deserialize(string(bytes.TrimSpace(b)))
 	if err != nil {
 		return nil, fmt.Errorf("invalid private key: %v", err)
 	}
-
 	return b, nil
 }
+
+func privFromHex(s string) (crypto.Signer, error) {
+	b, err := hex.Deserialize(optPriv)
+	if err != nil {
+		return nil, fmt.Errorf("invalid private key: %v", err)
+	}
+	if len(b) != ed25519.PrivateKeySize {
+		return nil, fmt.Errorf("invalid private key: size")
+	}
+	return ed25519.PrivateKey(b), nil
+}