add drafty tool named sigsum-debug

Meant to be used for debugging and tests only.

Replaces cmd/tmp/* in log-go, expect for the DNS command which is
redundant.  Use `dig -t txt $domain_hint` to debug domain hints.

1 files changed, 37 insertions, 0 deletions

diff --git a/cmd/sigsum-debug/leaf/sign/sign.go b/cmd/sigsum-debug/leaf/sign/sign.go
new file mode 100644
index 0000000..348ae23
--- /dev/null
+++ b/cmd/sigsum-debug/leaf/sign/sign.go
@@ -0,0 +1,37 @@
+package sign
+
+import (
+	"fmt"
+	"strings"
+
+	"git.sigsum.org/sigsum-go/internal/fmtio"
+	"git.sigsum.org/sigsum-go/pkg/hex"
+	"git.sigsum.org/sigsum-go/pkg/types"
+)
+
+func Main(args []string, optPrivateKey string, optShardHint uint64) error {
+	if len(args) != 0 {
+		return fmt.Errorf("trailing arguments: %s", strings.Join(args, ", "))
+	}
+	data, err := fmtio.BytesFromStdin()
+	if err != nil {
+		return fmt.Errorf("read stdin: %w", err)
+	}
+	priv, err := fmtio.SignerFromHex(optPrivateKey)
+	if err != nil {
+		return fmt.Errorf("parse private key: %w", err)
+	}
+
+	preimage := types.HashFn(data)
+	stm := types.Statement{
+		ShardHint: optShardHint,
+		Checksum:  *types.HashFn(preimage[:]),
+	}
+	sig, err := stm.Sign(priv)
+	if err != nil {
+		fmt.Errorf("sign leaf: %w", err)
+	}
+
+	fmt.Printf("%s\n", hex.Serialize(sig[:]))
+	return nil
+}