sign tree heads and leaves with SSHSIG

1 files changed, 31 insertions, 0 deletions

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
+
+}