From 8634892aa6d5d59f73e50652dbe750df263853a3 Mon Sep 17 00:00:00 2001
From: Linus Nordberg <linus@nordberg.se>
Date: Fri, 25 Mar 2022 16:36:27 +0100
Subject: sign tree heads and leaves with SSHSIG

---
 pkg/types/encoding.go | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 pkg/types/encoding.go

(limited to 'pkg/types/encoding.go')

diff --git a/pkg/types/encoding.go b/pkg/types/encoding.go
new file mode 100644
index 0000000..54a1ac6
--- /dev/null
+++ b/pkg/types/encoding.go
@@ -0,0 +1,31 @@
+package types
+
+import (
+	"encoding/binary"
+	"fmt"
+)
+
+// RFC4251, section 5
+
+func putSSHString(b []byte, str string) int {
+	l := len(str)
+
+	i := 0
+	binary.BigEndian.PutUint32(b[i:i+4], uint32(l))
+	i += 4
+	copy(b[i:i+l], str)
+	i += l
+
+	return i
+}
+
+func getSSHString(b []byte) (*string, error) {
+	if len(b) < 4 {
+		return nil, fmt.Errorf("types: invalid SSH string")
+	}
+
+	l := binary.BigEndian.Uint32(b[:4])
+	str := string(b[4 : 4+l])
+	return &str, nil
+
+}
-- 
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