1 files changed, 32 insertions, 0 deletions
diff --git a/cmd/sigsum-debug/key/public/public.go b/cmd/sigsum-debug/key/public/public.go
new file mode 100644
index 0000000..b03d0b9
--- /dev/null
+++ b/cmd/sigsum-debug/key/public/public.go
@@ -0,0 +1,32 @@
+package public
+
+import (
+	"crypto/ed25519"
+	"fmt"
+	"strings"
+
+	"git.sigsum.org/sigsum-go/internal/fmtio"
+	"git.sigsum.org/sigsum-go/pkg/hex"
+)
+
+func Main(args []string) error {
+	if len(args) != 0 {
+		return fmt.Errorf("trailing arguments: %s", strings.Join(args, ", "))
+	}
+	s, err := fmtio.StringFromStdin()
+	if err != nil {
+		return fmt.Errorf("read stdin: %w", err)
+	}
+
+	priv, err := fmtio.SignerFromHex(s)
+	if err != nil {
+		return fmt.Errorf("parse key: %w", err)
+	}
+	pub, ok := priv.Public().(ed25519.PublicKey)
+	if !ok {
+		return fmt.Errorf("not an ed25519 key")
+	}
+
+	fmt.Printf("%s\n", hex.Serialize(pub[:]))
+	return nil
+}