Doc: Added more information about the considered RFCs on the TSIG code

src/tsig.rs

@@ -51,7 +51,7 @@ fn set_tsig_rd(query_msg: &DnsMessage, name: String, original_id: u16, result: M
 
     return tsig_rd;
 }
-
+//This function responds to RFC 8945, section 5.1
 #[doc = r"This function creates the signature of a DnsMessage with  a  key in bytes and the algName that will be used to encrypt the key."]
 pub fn sign_tsig(query_msg: &mut DnsMessage, key: &[u8], alg_name: TsigAlgorithm, fudge: u16, time_signed: u64) -> Vec<u8> {
     let mut tsig_rd: TSigRdata = TSigRdata::new();
@@ -97,6 +97,7 @@ pub fn sign_tsig(query_msg: &mut DnsMessage, key: &[u8], alg_name: TsigAlgorithm
     return signature;
 }
 
+// RFC 5.2.1
 //Revisa si el nombre de la llave es correcto
 fn check_key(key_in_rr:String, key_name:String)-> bool {
     key_in_rr.eq(&key_name)
@@ -114,7 +115,7 @@ fn check_alg_name(alg_name:&String, alg_list: Vec<(String,bool)>) -> bool{
     }
     return answer
 }
-
+//RFC 8945 5.2.2: MAC check and error handling
 //Verifica que los mac sean iguales
 fn check_mac(new_mac: Vec<u8>, mac: Vec<u8>) -> bool{
     if mac.len()!=new_mac.len(){
@@ -228,6 +229,7 @@ pub fn process_tsig(msg: &DnsMessage,key:&[u8], key_name: String, time: u64,  av
         return (false, TsigErrorCode::BADSIG)
     }
     //let mytime = SystemTime::now().duration_since(UNIX_EPOCH).expect("no debería fallar el tiempo");
+    //RFC 8945 5.2.3
     let cond3 = check_time_values(time, fudge, time_signed);
     if !cond3 {
         println!("RCODE 9: NOAUTH\n TSIG ERROR 18: BADTIME");