add start on sigsum-debug utility

1 files changed, 24 insertions, 0 deletions

diff --git a/cmd/sigsum-debug/hashkey.go b/cmd/sigsum-debug/hashkey.go
new file mode 100644
index 0000000..d9b37dd
--- /dev/null
+++ b/cmd/sigsum-debug/hashkey.go
@@ -0,0 +1,24 @@
+package main
+
+import (
+	"crypto/ed25519"
+	"fmt"
+
+	"git.sigsum.org/sigsum-lib-go/pkg/hex"
+	"git.sigsum.org/sigsum-lib-go/pkg/types"
+)
+
+func CmdHashKey() error {
+	b, err := decodeHexFromStdin()
+	if err != nil {
+		return err
+	}
+	if len(b) != ed25519.PublicKeySize {
+		return fmt.Errorf("invalid private key: size")
+	}
+	pub := ed25519.PublicKey(b)
+	keyHash := types.HashFn(pub)
+
+	fmt.Printf("%s\n", hex.Serialize(keyHash[:]))
+	return nil
+}