From 047500ae23a12469ce3e458c6a58a642716041b7 Mon Sep 17 00:00:00 2001
From: Rasmus Dahlberg <rasmus@mullvad.net>
Date: Sat, 23 Apr 2022 18:19:25 +0200
Subject: 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.
---
 cmd/sigsum-debug/leaf/leaf.go | 119 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 cmd/sigsum-debug/leaf/leaf.go

(limited to 'cmd/sigsum-debug/leaf/leaf.go')

diff --git a/cmd/sigsum-debug/leaf/leaf.go b/cmd/sigsum-debug/leaf/leaf.go
new file mode 100644
index 0000000..97de37e
--- /dev/null
+++ b/cmd/sigsum-debug/leaf/leaf.go
@@ -0,0 +1,119 @@
+package leaf
+
+import (
+	"flag"
+	"fmt"
+	"log"
+
+	"git.sigsum.org/sigsum-go/cmd/sigsum-debug/leaf/hash"
+	"git.sigsum.org/sigsum-go/cmd/sigsum-debug/leaf/inclusion"
+	"git.sigsum.org/sigsum-go/cmd/sigsum-debug/leaf/sign"
+	"git.sigsum.org/sigsum-go/cmd/sigsum-debug/leaf/verify"
+	"git.sigsum.org/sigsum-go/internal/options"
+)
+
+const usage = `
+sigsum-debug leaf signs, verifies, and hashes Merkle tree leaves.
+
+Usage:
+
+  sigsum-debug leaf help
+    Outputs a usage message
+
+  sigsum-debug leaf sign -k PRIVATE_KEY -h SHARD_HINT
+    Reads data from stdin and outputs a signature
+
+  sigsum-debug leaf verify -k PUBLIC_KEY -s SIGNATURE -h SHARD_HINT
+    Reads data from stdin and verifies its signature
+
+  sigsum-debug leaf hash -k KEY_HASH -s SIGNATURE -h SHARD_HINT
+    Reads data from stdin and outputs a leaf hash
+
+  sigsum-debug leaf inclusion -l LEAF_HASH -n TREE_SIZE -r ROOT_HASH
+    Reads an inclusion proof from stdin and verifies it
+
+`
+
+var (
+	optPrivateKey, optPublicKey, optKeyHash, optLeafHash, optRootHash, optSignature string
+	optShardHint, optTreeSize                                                       uint64
+)
+
+func Main(args []string) error {
+	var err error
+
+	opt := options.New(args, func() { log.Printf(usage[1:]) }, setOptions)
+	err = checkOptions(opt.Name())
+	if err == nil {
+		switch opt.Name() {
+		case "help":
+			opt.Usage()
+		case "sign":
+			err = sign.Main(opt.Args(), optPrivateKey, optShardHint)
+		case "verify":
+			err = verify.Main(opt.Args(), optPublicKey, optSignature, optShardHint)
+		case "hash":
+			err = hash.Main(opt.Args(), optKeyHash, optSignature, optShardHint)
+		case "inclusion":
+			err = inclusion.Main(opt.Args(), optLeafHash, optRootHash, optTreeSize)
+		default:
+			err = fmt.Errorf("invalid command %q, try \"help\"", opt.Name())
+		}
+	}
+	if err != nil {
+		format := " %s: %w"
+		if len(opt.Name()) == 0 {
+			format = "%s: %w"
+		}
+		err = fmt.Errorf(format, opt.Name(), err)
+	}
+
+	return err
+}
+
+func setOptions(fs *flag.FlagSet) {
+	switch cmd := fs.Name(); cmd {
+	case "help":
+	case "sign":
+		options.AddString(fs, &optPrivateKey, "k", "private-key", options.DefaultString)
+		options.AddUint64(fs, &optShardHint, "h", "shard-hint", options.DefaultUint64)
+	case "verify":
+		options.AddString(fs, &optPublicKey, "k", "public-key", options.DefaultString)
+		options.AddString(fs, &optSignature, "s", "signature", options.DefaultString)
+		options.AddUint64(fs, &optShardHint, "h", "shard-hint", options.DefaultUint64)
+	case "hash":
+		options.AddString(fs, &optKeyHash, "k", "key-hash", options.DefaultString)
+		options.AddString(fs, &optSignature, "s", "signature", options.DefaultString)
+		options.AddUint64(fs, &optShardHint, "h", "shard-hint", options.DefaultUint64)
+	case "inclusion":
+		options.AddString(fs, &optLeafHash, "l", "leaf-hash", options.DefaultString)
+		options.AddUint64(fs, &optTreeSize, "n", "tree-size", options.DefaultUint64)
+		options.AddString(fs, &optRootHash, "r", "root-hash", options.DefaultString)
+	}
+}
+
+// checkOptions checks that options with required arguments were set
+func checkOptions(cmd string) error {
+	var err error
+
+	switch cmd {
+	case "help":
+	case "sign":
+		err = options.CheckString("private key", optPrivateKey, err)
+		err = options.CheckUint64("shard hint", optShardHint, err)
+	case "verify":
+		err = options.CheckString("public key", optPublicKey, err)
+		err = options.CheckString("signature", optSignature, err)
+		err = options.CheckUint64("shard hint", optShardHint, err)
+	case "hash":
+		err = options.CheckString("key hash", optKeyHash, err)
+		err = options.CheckString("signature", optSignature, err)
+		err = options.CheckUint64("shard hint", optShardHint, err)
+	case "inclusion":
+		err = options.CheckString("leaf hash", optLeafHash, err)
+		err = options.CheckUint64("tree size", optTreeSize, err)
+		err = options.CheckString("root hash", optRootHash, err)
+	}
+
+	return err
+}
-- 
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