encode method to add line break every 64 chars

encode.go

@@ -0,0 +1,16 @@
+package sshvault
+
+import "bytes"
+
+// Encode return base64 string with line break every 64 chars
+func (v *vault) Encode(b string, n int) []byte {
+	a := []rune(b)
+	var buffer bytes.Buffer
+	for i, r := range a {
+		buffer.WriteRune(r)
+		if i > 0 && (i+1)%64 == 0 {
+			buffer.WriteRune('\n')
+		}
+	}
+	return buffer.Bytes()
+}