Remove MD5 support

:(

README.md

@@ -82,8 +82,8 @@ Connect to a Postgres server using the standard URI format:
 let conn = PostgresConnection::connect("postgres://user:pass@host:port/database?arg1=val1&arg2=val2");
 ```
 `pass` may be omitted if not needed. `port` defaults to `5432` and `database`
-defaults to the value of `user` if not specified. The driver supports `trust`,
-`password` and `md5` authentication.
+defaults to the value of `user` if not specified. The driver supports `trust`
+and `password` authentication.
 
 Statement Preparation
 ---------------------

lib.rs

@@ -70,9 +70,7 @@ fn main() {
 extern mod extra;
 
 use extra::container::Deque;
-use extra::digest::Digest;
 use extra::ringbuf::RingBuf;
-use extra::md5::Md5;
 use extra::url::{UserInfo, Url};
 use std::cell::Cell;
 use std::hashmap::HashMap;
@@ -507,25 +505,8 @@ impl InnerPostgresConnection {
                 };
                 self.write_messages([&PasswordMessage { password: pass }]);
             }
-            AuthenticationMD5Password { salt } => {
-                let UserInfo { user, pass } = user;
-                let pass = match pass {
-                    Some(pass) => pass,
-                    None => return Some(MissingPassword)
-                };
-                let input = pass + user;
-                let mut md5 = Md5::new();
-                md5.input_str(input);
-                let output = md5.result_str();
-                md5.reset();
-                md5.input_str(output);
-                md5.input(salt);
-                let output = "md5" + md5.result_str();
-                self.write_messages([&PasswordMessage {
-                    password: output.as_slice()
-                }]);
-            }
-            AuthenticationKerberosV5
+            AuthenticationMD5Password { _ }
+            | AuthenticationKerberosV5
             | AuthenticationSCMCredential
             | AuthenticationGSS
             | AuthenticationSSPI => return Some(UnsupportedAuthentication),

tests.rs

@@ -528,31 +528,6 @@ fn test_plaintext_pass_wrong_pass() {
     }
 }
 
-#[test]
-fn test_md5_pass() {
-    PostgresConnection::connect("postgres://md5_user:password@localhost/postgres");
-}
-
-#[test]
-fn test_md5_pass_no_pass() {
-    let ret = PostgresConnection::try_connect("postgres://md5_user@localhost/postgres");
-    match ret {
-        Err(MissingPassword) => (),
-        Err(err) => fail!("Unexpected error {}", err.to_str()),
-        _ => fail!("Expected error")
-    }
-}
-
-#[test]
-fn test_md5_pass_wrong_pass() {
-    let ret = PostgresConnection::try_connect("postgres://md5_user:asdf@localhost/postgres");
-    match ret {
-        Err(DbError(PostgresDbError { code: InvalidPassword, _ })) => (),
-        Err(err) => fail!("Unexpected error {}", err.to_str()),
-        _ => fail!("Expected error")
-    }
-}
-
 #[test]
 fn test_dns_failure() {
     let ret = PostgresConnection::try_connect("postgres://postgres@asdfasdfasdf");