40     fn add_to(&self, m: &mut Message) -> Result<()> {  in add_to()
41         for a in &m.attributes.0 {  in add_to()
51         let length = m.length;  in add_to()
53         m.length += (MESSAGE_INTEGRITY_SIZE + ATTRIBUTE_HEADER_SIZE) as u32;  in add_to()
54         m.write_length(); // writing length to m.Raw  in add_to()
55         let v = new_hmac(&self.0, &m.raw); // calculating HMAC for adjusted m.Raw  in add_to()
56         m.length = length; // changing m.Length back  in add_to()
58         m.add(ATTR_MESSAGE_INTEGRITY, &v);  in add_to()
87     pub fn check(&self, m: &mut Message) -> Result<()> {  in check()
88         let v = m.get(ATTR_MESSAGE_INTEGRITY)?;  in check()
93         let length = m.length as usize;  in check()
97         for a in &m.attributes.0 {  in check()
106         m.length -= size_reduced as u32;  in check()
107         m.write_length();  in check()
109         let start_of_hmac = MESSAGE_HEADER_SIZE + m.length as usize  in check()
111         let b = &m.raw[..start_of_hmac]; // data before integrity attribute  in check()
113         m.length = length as u32;  in check()
114         m.write_length(); // writing length back  in check()