Remove old_password support (#922)

pymysql/_auth.py

@@ -2,7 +2,6 @@
 Implements auth methods
 """
 from .err import OperationalError
-from .util import byte2int, int2byte
 
 
 try:
@@ -16,9 +15,6 @@
 
 from functools import partial
 import hashlib
-import io
-import struct
-import warnings
 
 
 DEBUG = False
@@ -53,65 +49,6 @@ def _my_crypt(message1, message2):
     return bytes(result)
 
 
-# old_passwords support ported from libmysql/password.c
-# https://dev.mysql.com/doc/internals/en/old-password-authentication.html
-
-SCRAMBLE_LENGTH_323 = 8
-
-
-class RandStruct_323:
-    def __init__(self, seed1, seed2):
-        self.max_value = 0x3FFFFFFF
-        self.seed1 = seed1 % self.max_value
-        self.seed2 = seed2 % self.max_value
-
-    def my_rnd(self):
-        self.seed1 = (self.seed1 * 3 + self.seed2) % self.max_value
-        self.seed2 = (self.seed1 + self.seed2 + 33) % self.max_value
-        return float(self.seed1) / float(self.max_value)
-
-
-def scramble_old_password(password, message):
-    """Scramble for old_password"""
-    warnings.warn(
-        "old password (for MySQL <4.1) is used.  Upgrade your password with newer auth method.\n"
-        "old password support will be removed in future PyMySQL version"
-    )
-    hash_pass = _hash_password_323(password)
-    hash_message = _hash_password_323(message[:SCRAMBLE_LENGTH_323])
-    hash_pass_n = struct.unpack(">LL", hash_pass)
-    hash_message_n = struct.unpack(">LL", hash_message)
-
-    rand_st = RandStruct_323(
-        hash_pass_n[0] ^ hash_message_n[0], hash_pass_n[1] ^ hash_message_n[1]
-    )
-    outbuf = io.BytesIO()
-    for _ in range(min(SCRAMBLE_LENGTH_323, len(message))):
-        outbuf.write(int2byte(int(rand_st.my_rnd() * 31) + 64))
-    extra = int2byte(int(rand_st.my_rnd() * 31))
-    out = outbuf.getvalue()
-    outbuf = io.BytesIO()
-    for c in out:
-        outbuf.write(int2byte(byte2int(c) ^ byte2int(extra)))
-    return outbuf.getvalue()
-
-
-def _hash_password_323(password):
-    nr = 1345345333
-    add = 7
-    nr2 = 0x12345671
-
-    # x in py3 is numbers, p27 is chars
-    for c in [byte2int(x) for x in password if x not in (" ", "\t", 32, 9)]:
-        nr ^= (((nr & 63) + add) * c) + (nr << 8) & 0xFFFFFFFF
-        nr2 = (nr2 + ((nr2 << 8) ^ nr)) & 0xFFFFFFFF
-        add = (add + c) & 0xFFFFFFFF
-
-    r1 = nr & ((1 << 31) - 1)  # kill sign bits
-    r2 = nr2 & ((1 << 31) - 1)
-    return struct.pack(">LL", r1, r2)
-
-
 # MariaDB's client_ed25519-plugin
 # https://mariadb.com/kb/en/library/connection/#client_ed25519-plugin