add start on sigsum-debug utility

1 files changed, 24 insertions, 0 deletions

diff --git a/cmd/sigsum-debug/util.go b/cmd/sigsum-debug/util.go
new file mode 100644
index 0000000..d7ba6a8
--- /dev/null
+++ b/cmd/sigsum-debug/util.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"git.sigsum.org/sigsum-lib-go/pkg/hex"
+)
+
+func decodeHexFromStdin() ([]byte, error) {
+	b, err := ioutil.ReadAll(os.Stdin)
+	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
+}