5 files changed, 216 insertions, 0 deletions
diff --git a/cmd/sigsum-debug/leaf/hash/hash.go b/cmd/sigsum-debug/leaf/hash/hash.go
new file mode 100644
index 0000000..9bc845e
--- /dev/null
+++ b/cmd/sigsum-debug/leaf/hash/hash.go
@@ -0,0 +1,42 @@
+package hash
+
+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, optKeyHash, optSignature 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)
+	}
+	keyHash, err := fmtio.KeyHashFromHex(optKeyHash)
+	if err != nil {
+		return fmt.Errorf("parse key hash: %w", err)
+	}
+	sig, err := fmtio.SignatureFromHex(optSignature)
+	if err != nil {
+		return fmt.Errorf("parse signature: %w", err)
+	}
+
+	preimage := types.HashFn(data)
+	leaf := types.Leaf{
+		Statement: types.Statement{
+			ShardHint: optShardHint,
+			Checksum:  *types.HashFn(preimage[:]),
+		},
+		Signature: sig,
+		KeyHash:   keyHash,
+	}
+	leafHash := types.LeafHash(leaf.ToBinary())
+
+	fmt.Printf("%s\n", hex.Serialize(leafHash[:]))
+	return nil
+}
diff --git a/cmd/sigsum-debug/leaf/inclusion/inclusion.go b/cmd/sigsum-debug/leaf/inclusion/inclusion.go
new file mode 100644
index 0000000..f9aeb68
--- /dev/null
+++ b/cmd/sigsum-debug/leaf/inclusion/inclusion.go
@@ -0,0 +1,9 @@
+package inclusion
+
+import (
+	"fmt"
+)
+
+func Main(args []string, optLeafHash, optRootHash string, optTreeSize uint64) error {
+	return fmt.Errorf("TODO")
+}
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
+}
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
+}
diff --git a/cmd/sigsum-debug/leaf/verify/verify.go b/cmd/sigsum-debug/leaf/verify/verify.go
new file mode 100644
index 0000000..a00791a
--- /dev/null
+++ b/cmd/sigsum-debug/leaf/verify/verify.go
@@ -0,0 +1,9 @@
+package verify
+
+import (
+	"fmt"
+)
+
+func Main(args []string, optPublicKey, optSignature string, optShardHint uint64) error {
+	return fmt.Errorf("TODO")
+}