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backend/venv/Lib/site-packages/Crypto/Util/Counter.py

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+# -*- coding: ascii -*-
+#
+#  Util/Counter.py : Fast counter for use with CTR-mode ciphers
+#
+# Written in 2008 by Dwayne C. Litzenberger <dlitz@dlitz.net>
+#
+# ===================================================================
+# The contents of this file are dedicated to the public domain.  To
+# the extent that dedication to the public domain is not available,
+# everyone is granted a worldwide, perpetual, royalty-free,
+# non-exclusive license to exercise all rights associated with the
+# contents of this file for any purpose whatsoever.
+# No rights are reserved.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# ===================================================================
+
+def new(nbits, prefix=b"", suffix=b"", initial_value=1, little_endian=False, allow_wraparound=False):
+    """Create a stateful counter block function suitable for CTR encryption modes.
+
+    Each call to the function returns the next counter block.
+    Each counter block is made up by three parts:
+
+    +------+--------------+-------+
+    |prefix| counter value|postfix|
+    +------+--------------+-------+
+
+    The counter value is incremented by 1 at each call.
+
+    Args:
+      nbits (integer):
+        Length of the desired counter value, in bits. It must be a multiple of 8.
+      prefix (byte string):
+        The constant prefix of the counter block. By default, no prefix is
+        used.
+      suffix (byte string):
+        The constant postfix of the counter block. By default, no suffix is
+        used.
+      initial_value (integer):
+        The initial value of the counter. Default value is 1.
+        Its length in bits must not exceed the argument ``nbits``.
+      little_endian (boolean):
+        If ``True``, the counter number will be encoded in little endian format.
+        If ``False`` (default), in big endian format.
+      allow_wraparound (boolean):
+        This parameter is ignored.
+    Returns:
+      An object that can be passed with the :data:`counter` parameter to a CTR mode
+      cipher.
+
+    It must hold that *len(prefix) + nbits//8 + len(suffix)* matches the
+    block size of the underlying block cipher.
+    """
+
+    if (nbits % 8) != 0:
+        raise ValueError("'nbits' must be a multiple of 8")
+
+    iv_bl = initial_value.bit_length()
+    if iv_bl > nbits:
+        raise ValueError("Initial value takes %d bits but it is longer than "
+                         "the counter (%d bits)" %
+                         (iv_bl, nbits))
+
+    # Ignore wraparound
+    return {"counter_len": nbits // 8,
+            "prefix": prefix,
+            "suffix": suffix,
+            "initial_value": initial_value,
+            "little_endian": little_endian
+            }

backend/venv/Lib/site-packages/Crypto/Util/Counter.pyi

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+from typing import Optional, Union, Dict
+
+def new(nbits: int, prefix: Optional[bytes]=..., suffix: Optional[bytes]=..., initial_value: Optional[int]=1,
+        little_endian: Optional[bool]=False, allow_wraparound: Optional[bool]=False) -> \
+        Dict[str, Union[int, bytes, bool]]: ...

backend/venv/Lib/site-packages/Crypto/Util/Padding.py

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+#
+# Util/Padding.py :  Functions to manage padding
+#
+# ===================================================================
+#
+# Copyright (c) 2014, Legrandin <helderijs@gmail.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+__all__ = [ 'pad', 'unpad' ]
+
+from Crypto.Util.py3compat import *
+
+
+def pad(data_to_pad, block_size, style='pkcs7'):
+    """Apply standard padding.
+
+    Args:
+      data_to_pad (byte string):
+        The data that needs to be padded.
+      block_size (integer):
+        The block boundary to use for padding. The output length is guaranteed
+        to be a multiple of :data:`block_size`.
+      style (string):
+        Padding algorithm. It can be *'pkcs7'* (default), *'iso7816'* or *'x923'*.
+
+    Return:
+      byte string : the original data with the appropriate padding added at the end.
+    """
+
+    padding_len = block_size-len(data_to_pad)%block_size
+    if style == 'pkcs7':
+        padding = bchr(padding_len)*padding_len
+    elif style == 'x923':
+        padding = bchr(0)*(padding_len-1) + bchr(padding_len)
+    elif style == 'iso7816':
+        padding = bchr(128) + bchr(0)*(padding_len-1)
+    else:
+        raise ValueError("Unknown padding style")
+    return data_to_pad + padding
+
+
+def unpad(padded_data, block_size, style='pkcs7'):
+    """Remove standard padding.
+
+    Args:
+      padded_data (byte string):
+        A piece of data with padding that needs to be stripped.
+      block_size (integer):
+        The block boundary to use for padding. The input length
+        must be a multiple of :data:`block_size`.
+      style (string):
+        Padding algorithm. It can be *'pkcs7'* (default), *'iso7816'* or *'x923'*.
+    Return:
+        byte string : data without padding.
+    Raises:
+      ValueError: if the padding is incorrect.
+    """
+
+    pdata_len = len(padded_data)
+    if pdata_len == 0:
+        raise ValueError("Zero-length input cannot be unpadded")
+    if pdata_len % block_size:
+        raise ValueError("Input data is not padded")
+    if style in ('pkcs7', 'x923'):
+        padding_len = bord(padded_data[-1])
+        if padding_len<1 or padding_len>min(block_size, pdata_len):
+            raise ValueError("Padding is incorrect.")
+        if style == 'pkcs7':
+            if padded_data[-padding_len:]!=bchr(padding_len)*padding_len:
+                raise ValueError("PKCS#7 padding is incorrect.")
+        else:
+            if padded_data[-padding_len:-1]!=bchr(0)*(padding_len-1):
+                raise ValueError("ANSI X.923 padding is incorrect.")
+    elif style == 'iso7816':
+        padding_len = pdata_len - padded_data.rfind(bchr(128))
+        if padding_len<1 or padding_len>min(block_size, pdata_len):
+            raise ValueError("Padding is incorrect.")
+        if padding_len>1 and padded_data[1-padding_len:]!=bchr(0)*(padding_len-1):
+            raise ValueError("ISO 7816-4 padding is incorrect.")
+    else:
+        raise ValueError("Unknown padding style")
+    return padded_data[:-padding_len]
+

backend/venv/Lib/site-packages/Crypto/Util/Padding.pyi

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+from typing import Optional
+
+__all__ = [ 'pad', 'unpad' ]
+
+def pad(data_to_pad: bytes, block_size: int, style: Optional[str]='pkcs7') -> bytes: ...
+def unpad(padded_data: bytes, block_size: int, style: Optional[str]='pkcs7') -> bytes: ...

backend/venv/Lib/site-packages/Crypto/Util/RFC1751.py

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+# rfc1751.py : Converts between 128-bit strings and a human-readable
+# sequence of words, as defined in RFC1751: "A Convention for
+# Human-Readable 128-bit Keys", by Daniel L. McDonald.
+#
+# Part of the Python Cryptography Toolkit
+#
+# Written by Andrew M. Kuchling and others
+#
+# ===================================================================
+# The contents of this file are dedicated to the public domain.  To
+# the extent that dedication to the public domain is not available,
+# everyone is granted a worldwide, perpetual, royalty-free,
+# non-exclusive license to exercise all rights associated with the
+# contents of this file for any purpose whatsoever.
+# No rights are reserved.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# ===================================================================
+
+from __future__ import print_function
+
+import binascii
+
+from Crypto.Util.py3compat import bord, bchr
+
+binary = {0: '0000', 1: '0001', 2: '0010', 3: '0011', 4: '0100', 5: '0101',
+          6: '0110', 7: '0111', 8: '1000', 9: '1001', 10: '1010', 11: '1011',
+          12: '1100', 13: '1101', 14: '1110', 15: '1111'}
+
+
+def _key2bin(s):
+    "Convert a key into a string of binary digits"
+    kl = map(lambda x: bord(x), s)
+    kl = map(lambda x: binary[x >> 4] + binary[x & 15], kl)
+    return ''.join(kl)
+
+
+def _extract(key, start, length):
+    """Extract a bitstring(2.x)/bytestring(2.x) from a string of binary digits, and return its
+    numeric value."""
+
+    result = 0
+    for y in key[start:start+length]:
+        result = result * 2 + ord(y) - 48
+    return result
+
+
+def key_to_english(key):
+    """Transform an arbitrary key into a string containing English words.
+
+    Example::
+
+        >>> from Crypto.Util.RFC1751 import key_to_english
+        >>> key_to_english(b'66666666')
+        'RAM LOIS GOAD CREW CARE HIT'
+
+    Args:
+      key (byte string):
+        The key to convert. Its length must be a multiple of 8.
+    Return:
+      A string of English words.
+    """
+
+    if len(key) % 8 != 0:
+        raise ValueError('The length of the key must be a multiple of 8.')
+
+    english = ''
+    for index in range(0, len(key), 8):  # Loop over 8-byte subkeys
+        subkey = key[index:index + 8]
+        # Compute the parity of the key
+        skbin = _key2bin(subkey)
+        p = 0
+        for i in range(0, 64, 2):
+            p = p + _extract(skbin, i, 2)
+        # Append parity bits to the subkey
+        skbin = _key2bin(subkey + bchr((p << 6) & 255))
+        for i in range(0, 64, 11):
+            english = english + wordlist[_extract(skbin, i, 11)] + ' '
+
+    return english.strip()
+
+
+def english_to_key(s):
+    """Transform a string into a corresponding key.
+
+    Example::
+
+        >>> from Crypto.Util.RFC1751 import english_to_key
+        >>> english_to_key('RAM LOIS GOAD CREW CARE HIT')
+        b'66666666'
+
+    Args:
+      s (string): the string with the words separated by whitespace;
+                  the number of words must be a multiple of 6.
+    Return:
+      A byte string.
+    """
+
+    L = s.upper().split()
+    key = b''
+    for index in range(0, len(L), 6):
+        sublist = L[index:index + 6]
+        char = 9 * [0]
+        bits = 0
+        for i in sublist:
+            index = wordlist.index(i)
+            shift = (8 - (bits + 11) % 8) % 8
+            y = index << shift
+            cl, cc, cr = (y >> 16), (y >> 8) & 0xff, y & 0xff
+            if (shift > 5):
+                char[bits >> 3] = char[bits >> 3] | cl
+                char[(bits >> 3) + 1] = char[(bits >> 3) + 1] | cc
+                char[(bits >> 3) + 2] = char[(bits >> 3) + 2] | cr
+            elif shift > -3:
+                char[bits >> 3] = char[bits >> 3] | cc
+                char[(bits >> 3) + 1] = char[(bits >> 3) + 1] | cr
+            else:
+                char[bits >> 3] = char[bits >> 3] | cr
+            bits = bits + 11
+
+        subkey = b''
+        for y in char:
+            subkey = subkey + bchr(y)
+
+        # Check the parity of the resulting key
+        skbin = _key2bin(subkey)
+        p = 0
+        for i in range(0, 64, 2):
+            p = p + _extract(skbin, i, 2)
+        if (p & 3) != _extract(skbin, 64, 2):
+            raise ValueError("Parity error in resulting key")
+        key = key + subkey[0:8]
+    return key
+
+
+wordlist = [
+   "A", "ABE", "ACE", "ACT", "AD", "ADA", "ADD",
+   "AGO", "AID", "AIM", "AIR", "ALL", "ALP", "AM", "AMY", "AN", "ANA",
+   "AND", "ANN", "ANT", "ANY", "APE", "APS", "APT", "ARC", "ARE", "ARK",
+   "ARM", "ART", "AS", "ASH", "ASK", "AT", "ATE", "AUG", "AUK", "AVE",
+   "AWE", "AWK", "AWL", "AWN", "AX", "AYE", "BAD", "BAG", "BAH", "BAM",
+   "BAN", "BAR", "BAT", "BAY", "BE", "BED", "BEE", "BEG", "BEN", "BET",
+   "BEY", "BIB", "BID", "BIG", "BIN", "BIT", "BOB", "BOG", "BON", "BOO",
+   "BOP", "BOW", "BOY", "BUB", "BUD", "BUG", "BUM", "BUN", "BUS", "BUT",
+   "BUY", "BY", "BYE", "CAB", "CAL", "CAM", "CAN", "CAP", "CAR", "CAT",
+   "CAW", "COD", "COG", "COL", "CON", "COO", "COP", "COT", "COW", "COY",
+   "CRY", "CUB", "CUE", "CUP", "CUR", "CUT", "DAB", "DAD", "DAM", "DAN",
+   "DAR", "DAY", "DEE", "DEL", "DEN", "DES", "DEW", "DID", "DIE", "DIG",
+   "DIN", "DIP", "DO", "DOE", "DOG", "DON", "DOT", "DOW", "DRY", "DUB",
+   "DUD", "DUE", "DUG", "DUN", "EAR", "EAT", "ED", "EEL", "EGG", "EGO",
+   "ELI", "ELK", "ELM", "ELY", "EM", "END", "EST", "ETC", "EVA", "EVE",
+   "EWE", "EYE", "FAD", "FAN", "FAR", "FAT", "FAY", "FED", "FEE", "FEW",
+   "FIB", "FIG", "FIN", "FIR", "FIT", "FLO", "FLY", "FOE", "FOG", "FOR",
+   "FRY", "FUM", "FUN", "FUR", "GAB", "GAD", "GAG", "GAL", "GAM", "GAP",
+   "GAS", "GAY", "GEE", "GEL", "GEM", "GET", "GIG", "GIL", "GIN", "GO",
+   "GOT", "GUM", "GUN", "GUS", "GUT", "GUY", "GYM", "GYP", "HA", "HAD",
+   "HAL", "HAM", "HAN", "HAP", "HAS", "HAT", "HAW", "HAY", "HE", "HEM",
+   "HEN", "HER", "HEW", "HEY", "HI", "HID", "HIM", "HIP", "HIS", "HIT",
+   "HO", "HOB", "HOC", "HOE", "HOG", "HOP", "HOT", "HOW", "HUB", "HUE",
+   "HUG", "HUH", "HUM", "HUT", "I", "ICY", "IDA", "IF", "IKE", "ILL",
+   "INK", "INN", "IO", "ION", "IQ", "IRA", "IRE", "IRK", "IS", "IT",
+   "ITS", "IVY", "JAB", "JAG", "JAM", "JAN", "JAR", "JAW", "JAY", "JET",
+   "JIG", "JIM", "JO", "JOB", "JOE", "JOG", "JOT", "JOY", "JUG", "JUT",
+   "KAY", "KEG", "KEN", "KEY", "KID", "KIM", "KIN", "KIT", "LA", "LAB",
+   "LAC", "LAD", "LAG", "LAM", "LAP", "LAW", "LAY", "LEA", "LED", "LEE",
+   "LEG", "LEN", "LEO", "LET", "LEW", "LID", "LIE", "LIN", "LIP", "LIT",
+   "LO", "LOB", "LOG", "LOP", "LOS", "LOT", "LOU", "LOW", "LOY", "LUG",
+   "LYE", "MA", "MAC", "MAD", "MAE", "MAN", "MAO", "MAP", "MAT", "MAW",
+   "MAY", "ME", "MEG", "MEL", "MEN", "MET", "MEW", "MID", "MIN", "MIT",
+   "MOB", "MOD", "MOE", "MOO", "MOP", "MOS", "MOT", "MOW", "MUD", "MUG",
+   "MUM", "MY", "NAB", "NAG", "NAN", "NAP", "NAT", "NAY", "NE", "NED",
+   "NEE", "NET", "NEW", "NIB", "NIL", "NIP", "NIT", "NO", "NOB", "NOD",
+   "NON", "NOR", "NOT", "NOV", "NOW", "NU", "NUN", "NUT", "O", "OAF",
+   "OAK", "OAR", "OAT", "ODD", "ODE", "OF", "OFF", "OFT", "OH", "OIL",
+   "OK", "OLD", "ON", "ONE", "OR", "ORB", "ORE", "ORR", "OS", "OTT",
+   "OUR", "OUT", "OVA", "OW", "OWE", "OWL", "OWN", "OX", "PA", "PAD",
+   "PAL", "PAM", "PAN", "PAP", "PAR", "PAT", "PAW", "PAY", "PEA", "PEG",
+   "PEN", "PEP", "PER", "PET", "PEW", "PHI", "PI", "PIE", "PIN", "PIT",
+   "PLY", "PO", "POD", "POE", "POP", "POT", "POW", "PRO", "PRY", "PUB",
+   "PUG", "PUN", "PUP", "PUT", "QUO", "RAG", "RAM", "RAN", "RAP", "RAT",
+   "RAW", "RAY", "REB", "RED", "REP", "RET", "RIB", "RID", "RIG", "RIM",
+   "RIO", "RIP", "ROB", "ROD", "ROE", "RON", "ROT", "ROW", "ROY", "RUB",
+   "RUE", "RUG", "RUM", "RUN", "RYE", "SAC", "SAD", "SAG", "SAL", "SAM",
+   "SAN", "SAP", "SAT", "SAW", "SAY", "SEA", "SEC", "SEE", "SEN", "SET",
+   "SEW", "SHE", "SHY", "SIN", "SIP", "SIR", "SIS", "SIT", "SKI", "SKY",
+   "SLY", "SO", "SOB", "SOD", "SON", "SOP", "SOW", "SOY", "SPA", "SPY",
+   "SUB", "SUD", "SUE", "SUM", "SUN", "SUP", "TAB", "TAD", "TAG", "TAN",
+   "TAP", "TAR", "TEA", "TED", "TEE", "TEN", "THE", "THY", "TIC", "TIE",
+   "TIM", "TIN", "TIP", "TO", "TOE", "TOG", "TOM", "TON", "TOO", "TOP",
+   "TOW", "TOY", "TRY", "TUB", "TUG", "TUM", "TUN", "TWO", "UN", "UP",
+   "US", "USE", "VAN", "VAT", "VET", "VIE", "WAD", "WAG", "WAR", "WAS",
+   "WAY", "WE", "WEB", "WED", "WEE", "WET", "WHO", "WHY", "WIN", "WIT",
+   "WOK", "WON", "WOO", "WOW", "WRY", "WU", "YAM", "YAP", "YAW", "YE",
+   "YEA", "YES", "YET", "YOU", "ABED", "ABEL", "ABET", "ABLE", "ABUT",
+   "ACHE", "ACID", "ACME", "ACRE", "ACTA", "ACTS", "ADAM", "ADDS",
+   "ADEN", "AFAR", "AFRO", "AGEE", "AHEM", "AHOY", "AIDA", "AIDE",
+   "AIDS", "AIRY", "AJAR", "AKIN", "ALAN", "ALEC", "ALGA", "ALIA",
+   "ALLY", "ALMA", "ALOE", "ALSO", "ALTO", "ALUM", "ALVA", "AMEN",
+   "AMES", "AMID", "AMMO", "AMOK", "AMOS", "AMRA", "ANDY", "ANEW",
+   "ANNA", "ANNE", "ANTE", "ANTI", "AQUA", "ARAB", "ARCH", "AREA",
+   "ARGO", "ARID", "ARMY", "ARTS", "ARTY", "ASIA", "ASKS", "ATOM",
+   "AUNT", "AURA", "AUTO", "AVER", "AVID", "AVIS", "AVON", "AVOW",
+   "AWAY", "AWRY", "BABE", "BABY", "BACH", "BACK", "BADE", "BAIL",
+   "BAIT", "BAKE", "BALD", "BALE", "BALI", "BALK", "BALL", "BALM",
+   "BAND", "BANE", "BANG", "BANK", "BARB", "BARD", "BARE", "BARK",
+   "BARN", "BARR", "BASE", "BASH", "BASK", "BASS", "BATE", "BATH",
+   "BAWD", "BAWL", "BEAD", "BEAK", "BEAM", "BEAN", "BEAR", "BEAT",
+   "BEAU", "BECK", "BEEF", "BEEN", "BEER",
+   "BEET", "BELA", "BELL", "BELT", "BEND", "BENT", "BERG", "BERN",
+   "BERT", "BESS", "BEST", "BETA", "BETH", "BHOY", "BIAS", "BIDE",
+   "BIEN", "BILE", "BILK", "BILL", "BIND", "BING", "BIRD", "BITE",
+   "BITS", "BLAB", "BLAT", "BLED", "BLEW", "BLOB", "BLOC", "BLOT",
+   "BLOW", "BLUE", "BLUM", "BLUR", "BOAR", "BOAT", "BOCA", "BOCK",
+   "BODE", "BODY", "BOGY", "BOHR", "BOIL", "BOLD", "BOLO", "BOLT",
+   "BOMB", "BONA", "BOND", "BONE", "BONG", "BONN", "BONY", "BOOK",
+   "BOOM", "BOON", "BOOT", "BORE", "BORG", "BORN", "BOSE", "BOSS",
+   "BOTH", "BOUT", "BOWL", "BOYD", "BRAD", "BRAE", "BRAG", "BRAN",
+   "BRAY", "BRED", "BREW", "BRIG", "BRIM", "BROW", "BUCK", "BUDD",
+   "BUFF", "BULB", "BULK", "BULL", "BUNK", "BUNT", "BUOY", "BURG",
+   "BURL", "BURN", "BURR", "BURT", "BURY", "BUSH", "BUSS", "BUST",
+   "BUSY", "BYTE", "CADY", "CAFE", "CAGE", "CAIN", "CAKE", "CALF",
+   "CALL", "CALM", "CAME", "CANE", "CANT", "CARD", "CARE", "CARL",
+   "CARR", "CART", "CASE", "CASH", "CASK", "CAST", "CAVE", "CEIL",
+   "CELL", "CENT", "CERN", "CHAD", "CHAR", "CHAT", "CHAW", "CHEF",
+   "CHEN", "CHEW", "CHIC", "CHIN", "CHOU", "CHOW", "CHUB", "CHUG",
+   "CHUM", "CITE", "CITY", "CLAD", "CLAM", "CLAN", "CLAW", "CLAY",
+   "CLOD", "CLOG", "CLOT", "CLUB", "CLUE", "COAL", "COAT", "COCA",
+   "COCK", "COCO", "CODA", "CODE", "CODY", "COED", "COIL", "COIN",
+   "COKE", "COLA", "COLD", "COLT", "COMA", "COMB", "COME", "COOK",
+   "COOL", "COON", "COOT", "CORD", "CORE", "CORK", "CORN", "COST",
+   "COVE", "COWL", "CRAB", "CRAG", "CRAM", "CRAY", "CREW", "CRIB",
+   "CROW", "CRUD", "CUBA", "CUBE", "CUFF", "CULL", "CULT", "CUNY",
+   "CURB", "CURD", "CURE", "CURL", "CURT", "CUTS", "DADE", "DALE",
+   "DAME", "DANA", "DANE", "DANG", "DANK", "DARE", "DARK", "DARN",
+   "DART", "DASH", "DATA", "DATE", "DAVE", "DAVY", "DAWN", "DAYS",
+   "DEAD", "DEAF", "DEAL", "DEAN", "DEAR", "DEBT", "DECK", "DEED",
+   "DEEM", "DEER", "DEFT", "DEFY", "DELL", "DENT", "DENY", "DESK",
+   "DIAL", "DICE", "DIED", "DIET", "DIME", "DINE", "DING", "DINT",
+   "DIRE", "DIRT", "DISC", "DISH", "DISK", "DIVE", "DOCK", "DOES",
+   "DOLE", "DOLL", "DOLT", "DOME", "DONE", "DOOM", "DOOR", "DORA",
+   "DOSE", "DOTE", "DOUG", "DOUR", "DOVE", "DOWN", "DRAB", "DRAG",
+   "DRAM", "DRAW", "DREW", "DRUB", "DRUG", "DRUM", "DUAL", "DUCK",
+   "DUCT", "DUEL", "DUET", "DUKE", "DULL", "DUMB", "DUNE", "DUNK",
+   "DUSK", "DUST", "DUTY", "EACH", "EARL", "EARN", "EASE", "EAST",
+   "EASY", "EBEN", "ECHO", "EDDY", "EDEN", "EDGE", "EDGY", "EDIT",
+   "EDNA", "EGAN", "ELAN", "ELBA", "ELLA", "ELSE", "EMIL", "EMIT",
+   "EMMA", "ENDS", "ERIC", "EROS", "EVEN", "EVER", "EVIL", "EYED",
+   "FACE", "FACT", "FADE", "FAIL", "FAIN", "FAIR", "FAKE", "FALL",
+   "FAME", "FANG", "FARM", "FAST", "FATE", "FAWN", "FEAR", "FEAT",
+   "FEED", "FEEL", "FEET", "FELL", "FELT", "FEND", "FERN", "FEST",
+   "FEUD", "FIEF", "FIGS", "FILE", "FILL", "FILM", "FIND", "FINE",
+   "FINK", "FIRE", "FIRM", "FISH", "FISK", "FIST", "FITS", "FIVE",
+   "FLAG", "FLAK", "FLAM", "FLAT", "FLAW", "FLEA", "FLED", "FLEW",
+   "FLIT", "FLOC", "FLOG", "FLOW", "FLUB", "FLUE", "FOAL", "FOAM",
+   "FOGY", "FOIL", "FOLD", "FOLK", "FOND", "FONT", "FOOD", "FOOL",
+   "FOOT", "FORD", "FORE", "FORK", "FORM", "FORT", "FOSS", "FOUL",
+   "FOUR", "FOWL", "FRAU", "FRAY", "FRED", "FREE", "FRET", "FREY",
+   "FROG", "FROM", "FUEL", "FULL", "FUME", "FUND", "FUNK", "FURY",
+   "FUSE", "FUSS", "GAFF", "GAGE", "GAIL", "GAIN", "GAIT", "GALA",
+   "GALE", "GALL", "GALT", "GAME", "GANG", "GARB", "GARY", "GASH",
+   "GATE", "GAUL", "GAUR", "GAVE", "GAWK", "GEAR", "GELD", "GENE",
+   "GENT", "GERM", "GETS", "GIBE", "GIFT", "GILD", "GILL", "GILT",
+   "GINA", "GIRD", "GIRL", "GIST", "GIVE", "GLAD", "GLEE", "GLEN",
+   "GLIB", "GLOB", "GLOM", "GLOW", "GLUE", "GLUM", "GLUT", "GOAD",
+   "GOAL", "GOAT", "GOER", "GOES", "GOLD", "GOLF", "GONE", "GONG",
+   "GOOD", "GOOF", "GORE", "GORY", "GOSH", "GOUT", "GOWN", "GRAB",
+   "GRAD", "GRAY", "GREG", "GREW", "GREY", "GRID", "GRIM", "GRIN",
+   "GRIT", "GROW", "GRUB", "GULF", "GULL", "GUNK", "GURU", "GUSH",
+   "GUST", "GWEN", "GWYN", "HAAG", "HAAS", "HACK", "HAIL", "HAIR",
+   "HALE", "HALF", "HALL", "HALO", "HALT", "HAND", "HANG", "HANK",
+   "HANS", "HARD", "HARK", "HARM", "HART", "HASH", "HAST", "HATE",
+   "HATH", "HAUL", "HAVE", "HAWK", "HAYS", "HEAD", "HEAL", "HEAR",
+   "HEAT", "HEBE", "HECK", "HEED", "HEEL", "HEFT", "HELD", "HELL",
+   "HELM", "HERB", "HERD", "HERE", "HERO", "HERS", "HESS", "HEWN",
+   "HICK", "HIDE", "HIGH", "HIKE", "HILL", "HILT", "HIND", "HINT",
+   "HIRE", "HISS", "HIVE", "HOBO", "HOCK", "HOFF", "HOLD", "HOLE",
+   "HOLM", "HOLT", "HOME", "HONE", "HONK", "HOOD", "HOOF", "HOOK",
+   "HOOT", "HORN", "HOSE", "HOST", "HOUR", "HOVE", "HOWE", "HOWL",
+   "HOYT", "HUCK", "HUED", "HUFF", "HUGE", "HUGH", "HUGO", "HULK",
+   "HULL", "HUNK", "HUNT", "HURD", "HURL", "HURT", "HUSH", "HYDE",
+   "HYMN", "IBIS", "ICON", "IDEA", "IDLE", "IFFY", "INCA", "INCH",
+   "INTO", "IONS", "IOTA", "IOWA", "IRIS", "IRMA", "IRON", "ISLE",
+   "ITCH", "ITEM", "IVAN", "JACK", "JADE", "JAIL", "JAKE", "JANE",
+   "JAVA", "JEAN", "JEFF", "JERK", "JESS", "JEST", "JIBE", "JILL",
+   "JILT", "JIVE", "JOAN", "JOBS", "JOCK", "JOEL", "JOEY", "JOHN",
+   "JOIN", "JOKE", "JOLT", "JOVE", "JUDD", "JUDE", "JUDO", "JUDY",
+   "JUJU", "JUKE", "JULY", "JUNE", "JUNK", "JUNO", "JURY", "JUST",
+   "JUTE", "KAHN", "KALE", "KANE", "KANT", "KARL", "KATE", "KEEL",
+   "KEEN", "KENO", "KENT", "KERN", "KERR", "KEYS", "KICK", "KILL",
+   "KIND", "KING", "KIRK", "KISS", "KITE", "KLAN", "KNEE", "KNEW",
+   "KNIT", "KNOB", "KNOT", "KNOW", "KOCH", "KONG", "KUDO", "KURD",
+   "KURT", "KYLE", "LACE", "LACK", "LACY", "LADY", "LAID", "LAIN",
+   "LAIR", "LAKE", "LAMB", "LAME", "LAND", "LANE", "LANG", "LARD",
+   "LARK", "LASS", "LAST", "LATE", "LAUD", "LAVA", "LAWN", "LAWS",
+   "LAYS", "LEAD", "LEAF", "LEAK", "LEAN", "LEAR", "LEEK", "LEER",
+   "LEFT", "LEND", "LENS", "LENT", "LEON", "LESK", "LESS", "LEST",
+   "LETS", "LIAR", "LICE", "LICK", "LIED", "LIEN", "LIES", "LIEU",
+   "LIFE", "LIFT", "LIKE", "LILA", "LILT", "LILY", "LIMA", "LIMB",
+   "LIME", "LIND", "LINE", "LINK", "LINT", "LION", "LISA", "LIST",
+   "LIVE", "LOAD", "LOAF", "LOAM", "LOAN", "LOCK", "LOFT", "LOGE",
+   "LOIS", "LOLA", "LONE", "LONG", "LOOK", "LOON", "LOOT", "LORD",
+   "LORE", "LOSE", "LOSS", "LOST", "LOUD", "LOVE", "LOWE", "LUCK",
+   "LUCY", "LUGE", "LUKE", "LULU", "LUND", "LUNG", "LURA", "LURE",
+   "LURK", "LUSH", "LUST", "LYLE", "LYNN", "LYON", "LYRA", "MACE",
+   "MADE", "MAGI", "MAID", "MAIL", "MAIN", "MAKE", "MALE", "MALI",
+   "MALL", "MALT", "MANA", "MANN", "MANY", "MARC", "MARE", "MARK",
+   "MARS", "MART", "MARY", "MASH", "MASK", "MASS", "MAST", "MATE",
+   "MATH", "MAUL", "MAYO", "MEAD", "MEAL", "MEAN", "MEAT", "MEEK",
+   "MEET", "MELD", "MELT", "MEMO", "MEND", "MENU", "MERT", "MESH",
+   "MESS", "MICE", "MIKE", "MILD", "MILE", "MILK", "MILL", "MILT",
+   "MIMI", "MIND", "MINE", "MINI", "MINK", "MINT", "MIRE", "MISS",
+   "MIST", "MITE", "MITT", "MOAN", "MOAT", "MOCK", "MODE", "MOLD",
+   "MOLE", "MOLL", "MOLT", "MONA", "MONK", "MONT", "MOOD", "MOON",
+   "MOOR", "MOOT", "MORE", "MORN", "MORT", "MOSS", "MOST", "MOTH",
+   "MOVE", "MUCH", "MUCK", "MUDD", "MUFF", "MULE", "MULL", "MURK",
+   "MUSH", "MUST", "MUTE", "MUTT", "MYRA", "MYTH", "NAGY", "NAIL",
+   "NAIR", "NAME", "NARY", "NASH", "NAVE", "NAVY", "NEAL", "NEAR",
+   "NEAT", "NECK", "NEED", "NEIL", "NELL", "NEON", "NERO", "NESS",
+   "NEST", "NEWS", "NEWT", "NIBS", "NICE", "NICK", "NILE", "NINA",
+   "NINE", "NOAH", "NODE", "NOEL", "NOLL", "NONE", "NOOK", "NOON",
+   "NORM", "NOSE", "NOTE", "NOUN", "NOVA", "NUDE", "NULL", "NUMB",
+   "OATH", "OBEY", "OBOE", "ODIN", "OHIO", "OILY", "OINT", "OKAY",
+   "OLAF", "OLDY", "OLGA", "OLIN", "OMAN", "OMEN", "OMIT", "ONCE",
+   "ONES", "ONLY", "ONTO", "ONUS", "ORAL", "ORGY", "OSLO", "OTIS",
+   "OTTO", "OUCH", "OUST", "OUTS", "OVAL", "OVEN", "OVER", "OWLY",
+   "OWNS", "QUAD", "QUIT", "QUOD", "RACE", "RACK", "RACY", "RAFT",
+   "RAGE", "RAID", "RAIL", "RAIN", "RAKE", "RANK", "RANT", "RARE",
+   "RASH", "RATE", "RAVE", "RAYS", "READ", "REAL", "REAM", "REAR",
+   "RECK", "REED", "REEF", "REEK", "REEL", "REID", "REIN", "RENA",
+   "REND", "RENT", "REST", "RICE", "RICH", "RICK", "RIDE", "RIFT",
+   "RILL", "RIME", "RING", "RINK", "RISE", "RISK", "RITE", "ROAD",
+   "ROAM", "ROAR", "ROBE", "ROCK", "RODE", "ROIL", "ROLL", "ROME",
+   "ROOD", "ROOF", "ROOK", "ROOM", "ROOT", "ROSA", "ROSE", "ROSS",
+   "ROSY", "ROTH", "ROUT", "ROVE", "ROWE", "ROWS", "RUBE", "RUBY",
+   "RUDE", "RUDY", "RUIN", "RULE", "RUNG", "RUNS", "RUNT", "RUSE",
+   "RUSH", "RUSK", "RUSS", "RUST", "RUTH", "SACK", "SAFE", "SAGE",
+   "SAID", "SAIL", "SALE", "SALK", "SALT", "SAME", "SAND", "SANE",
+   "SANG", "SANK", "SARA", "SAUL", "SAVE", "SAYS", "SCAN", "SCAR",
+   "SCAT", "SCOT", "SEAL", "SEAM", "SEAR", "SEAT", "SEED", "SEEK",
+   "SEEM", "SEEN", "SEES", "SELF", "SELL", "SEND", "SENT", "SETS",
+   "SEWN", "SHAG", "SHAM", "SHAW", "SHAY", "SHED", "SHIM", "SHIN",
+   "SHOD", "SHOE", "SHOT", "SHOW", "SHUN", "SHUT", "SICK", "SIDE",
+   "SIFT", "SIGH", "SIGN", "SILK", "SILL", "SILO", "SILT", "SINE",
+   "SING", "SINK", "SIRE", "SITE", "SITS", "SITU", "SKAT", "SKEW",
+   "SKID", "SKIM", "SKIN", "SKIT", "SLAB", "SLAM", "SLAT", "SLAY",
+   "SLED", "SLEW", "SLID", "SLIM", "SLIT", "SLOB", "SLOG", "SLOT",
+   "SLOW", "SLUG", "SLUM", "SLUR", "SMOG", "SMUG", "SNAG", "SNOB",
+   "SNOW", "SNUB", "SNUG", "SOAK", "SOAR", "SOCK", "SODA", "SOFA",
+   "SOFT", "SOIL", "SOLD", "SOME", "SONG", "SOON", "SOOT", "SORE",
+   "SORT", "SOUL", "SOUR", "SOWN", "STAB", "STAG", "STAN", "STAR",
+   "STAY", "STEM", "STEW", "STIR", "STOW", "STUB", "STUN", "SUCH",
+   "SUDS", "SUIT", "SULK", "SUMS", "SUNG", "SUNK", "SURE", "SURF",
+   "SWAB", "SWAG", "SWAM", "SWAN", "SWAT", "SWAY", "SWIM", "SWUM",
+   "TACK", "TACT", "TAIL", "TAKE", "TALE", "TALK", "TALL", "TANK",
+   "TASK", "TATE", "TAUT", "TEAL", "TEAM", "TEAR", "TECH", "TEEM",
+   "TEEN", "TEET", "TELL", "TEND", "TENT", "TERM", "TERN", "TESS",
+   "TEST", "THAN", "THAT", "THEE", "THEM", "THEN", "THEY", "THIN",
+   "THIS", "THUD", "THUG", "TICK", "TIDE", "TIDY", "TIED", "TIER",
+   "TILE", "TILL", "TILT", "TIME", "TINA", "TINE", "TINT", "TINY",
+   "TIRE", "TOAD", "TOGO", "TOIL", "TOLD", "TOLL", "TONE", "TONG",
+   "TONY", "TOOK", "TOOL", "TOOT", "TORE", "TORN", "TOTE", "TOUR",
+   "TOUT", "TOWN", "TRAG", "TRAM", "TRAY", "TREE", "TREK", "TRIG",
+   "TRIM", "TRIO", "TROD", "TROT", "TROY", "TRUE", "TUBA", "TUBE",
+   "TUCK", "TUFT", "TUNA", "TUNE", "TUNG", "TURF", "TURN", "TUSK",
+   "TWIG", "TWIN", "TWIT", "ULAN", "UNIT", "URGE", "USED", "USER",
+   "USES", "UTAH", "VAIL", "VAIN", "VALE", "VARY", "VASE", "VAST",
+   "VEAL", "VEDA", "VEIL", "VEIN", "VEND", "VENT", "VERB", "VERY",
+   "VETO", "VICE", "VIEW", "VINE", "VISE", "VOID", "VOLT", "VOTE",
+   "WACK", "WADE", "WAGE", "WAIL", "WAIT", "WAKE", "WALE", "WALK",
+   "WALL", "WALT", "WAND", "WANE", "WANG", "WANT", "WARD", "WARM",
+   "WARN", "WART", "WASH", "WAST", "WATS", "WATT", "WAVE", "WAVY",
+   "WAYS", "WEAK", "WEAL", "WEAN", "WEAR", "WEED", "WEEK", "WEIR",
+   "WELD", "WELL", "WELT", "WENT", "WERE", "WERT", "WEST", "WHAM",
+   "WHAT", "WHEE", "WHEN", "WHET", "WHOA", "WHOM", "WICK", "WIFE",
+   "WILD", "WILL", "WIND", "WINE", "WING", "WINK", "WINO", "WIRE",
+   "WISE", "WISH", "WITH", "WOLF", "WONT", "WOOD", "WOOL", "WORD",
+   "WORE", "WORK", "WORM", "WORN", "WOVE", "WRIT", "WYNN", "YALE",
+   "YANG", "YANK", "YARD", "YARN", "YAWL", "YAWN", "YEAH", "YEAR",
+   "YELL", "YOGA", "YOKE" ]

backend/venv/Lib/site-packages/Crypto/Util/RFC1751.pyi

@@ -0,0 +1,7 @@
+from typing import Dict, List
+
+binary: Dict[int, str]
+wordlist: List[str]
+
+def key_to_english(key: bytes) -> str: ...
+def english_to_key(s: str) -> bytes: ...

backend/venv/Lib/site-packages/Crypto/Util/__init__.py

@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+#
+# ===================================================================
+# The contents of this file are dedicated to the public domain.  To
+# the extent that dedication to the public domain is not available,
+# everyone is granted a worldwide, perpetual, royalty-free,
+# non-exclusive license to exercise all rights associated with the
+# contents of this file for any purpose whatsoever.
+# No rights are reserved.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# ===================================================================
+
+"""Miscellaneous modules
+
+Contains useful modules that don't belong into any of the
+other Crypto.* subpackages.
+
+========================    =============================================
+Module                      Description
+========================    =============================================
+`Crypto.Util.number`        Number-theoretic functions (primality testing, etc.)
+`Crypto.Util.Counter`       Fast counter functions for CTR cipher modes.
+`Crypto.Util.RFC1751`       Converts between 128-bit keys and human-readable
+                            strings of words.
+`Crypto.Util.asn1`          Minimal support for ASN.1 DER encoding
+`Crypto.Util.Padding`       Set of functions for adding and removing padding.
+========================    =============================================
+
+:undocumented: _galois, _number_new, cpuid, py3compat, _raw_api
+"""
+
+__all__ = ['RFC1751', 'number', 'strxor', 'asn1', 'Counter', 'Padding']
+

backend/venv/Lib/site-packages/Crypto/Util/_cpu_features.py

@@ -0,0 +1,46 @@
+# ===================================================================
+#
+# Copyright (c) 2018, Helder Eijs <helderijs@gmail.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+from Crypto.Util._raw_api import load_pycryptodome_raw_lib
+
+
+_raw_cpuid_lib = load_pycryptodome_raw_lib("Crypto.Util._cpuid_c",
+                                           """
+                                           int have_aes_ni(void);
+                                           int have_clmul(void);
+                                           """)
+
+
+def have_aes_ni():
+    return _raw_cpuid_lib.have_aes_ni()
+
+
+def have_clmul():
+    return _raw_cpuid_lib.have_clmul()

backend/venv/Lib/site-packages/Crypto/Util/_cpu_features.pyi

@@ -0,0 +1,2 @@
+def have_aes_ni() -> int: ...
+def have_clmul() -> int: ...

backend/venv/Lib/site-packages/Crypto/Util/_file_system.py

@@ -0,0 +1,54 @@
+# ===================================================================
+#
+# Copyright (c) 2016, Legrandin <helderijs@gmail.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+import os
+
+
+def pycryptodome_filename(dir_comps, filename):
+    """Return the complete file name for the module
+
+    dir_comps : list of string
+        The list of directory names in the PyCryptodome package.
+        The first element must be "Crypto".
+
+    filename : string
+        The filename (inclusing extension) in the target directory.
+    """
+
+    if dir_comps[0] != "Crypto":
+        raise ValueError("Only available for modules under 'Crypto'")
+
+    dir_comps = list(dir_comps[1:]) + [filename]
+
+    util_lib, _ = os.path.split(os.path.abspath(__file__))
+    root_lib = os.path.join(util_lib, "..")
+
+    return os.path.join(root_lib, *dir_comps)
+

backend/venv/Lib/site-packages/Crypto/Util/_file_system.pyi

@@ -0,0 +1,4 @@
+from typing import List
+
+
+def pycryptodome_filename(dir_comps: List[str], filename: str) -> str: ...

backend/venv/Lib/site-packages/Crypto/Util/_raw_api.py

@@ -0,0 +1,325 @@
+# ===================================================================
+#
+# Copyright (c) 2014, Legrandin <helderijs@gmail.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+import os
+import abc
+import sys
+from Crypto.Util.py3compat import byte_string
+from Crypto.Util._file_system import pycryptodome_filename
+
+#
+# List of file suffixes for Python extensions
+#
+if sys.version_info[0] < 3:
+
+    import imp
+    extension_suffixes = []
+    for ext, mod, typ in imp.get_suffixes():
+        if typ == imp.C_EXTENSION:
+            extension_suffixes.append(ext)
+
+else:
+
+    from importlib import machinery
+    extension_suffixes = machinery.EXTENSION_SUFFIXES
+
+# Which types with buffer interface we support (apart from byte strings)
+_buffer_type = (bytearray, memoryview)
+
+
+class _VoidPointer(object):
+    @abc.abstractmethod
+    def get(self):
+        """Return the memory location we point to"""
+        return
+
+    @abc.abstractmethod
+    def address_of(self):
+        """Return a raw pointer to this pointer"""
+        return
+
+
+try:
+    # Starting from v2.18, pycparser (used by cffi for in-line ABI mode)
+    # stops working correctly when PYOPTIMIZE==2 or the parameter -OO is
+    # passed. In that case, we fall back to ctypes.
+    # Note that PyPy ships with an old version of pycparser so we can keep
+    # using cffi there.
+    # See https://github.com/Legrandin/pycryptodome/issues/228
+    if '__pypy__' not in sys.builtin_module_names and sys.flags.optimize == 2:
+        raise ImportError("CFFI with optimize=2 fails due to pycparser bug.")
+
+    # cffi still uses PyUnicode_GetSize, which was removed in Python 3.12
+    # thus leading to a crash on cffi.dlopen()
+    # See https://groups.google.com/u/1/g/python-cffi/c/oZkOIZ_zi5k
+    if sys.version_info >= (3, 12) and os.name == "nt":
+        raise ImportError("CFFI is not compatible with Python 3.12 on Windows")
+
+    from cffi import FFI
+
+    ffi = FFI()
+    null_pointer = ffi.NULL
+    uint8_t_type = ffi.typeof(ffi.new("const uint8_t*"))
+
+    _Array = ffi.new("uint8_t[1]").__class__.__bases__
+
+    def load_lib(name, cdecl):
+        """Load a shared library and return a handle to it.
+
+        @name,  either an absolute path or the name of a library
+                in the system search path.
+
+        @cdecl, the C function declarations.
+        """
+
+        if hasattr(ffi, "RTLD_DEEPBIND") and not os.getenv('PYCRYPTODOME_DISABLE_DEEPBIND'):
+            lib = ffi.dlopen(name, ffi.RTLD_DEEPBIND)
+        else:
+            lib = ffi.dlopen(name)
+        ffi.cdef(cdecl)
+        return lib
+
+    def c_ulong(x):
+        """Convert a Python integer to unsigned long"""
+        return x
+
+    c_ulonglong = c_ulong
+    c_uint = c_ulong
+    c_ubyte = c_ulong
+
+    def c_size_t(x):
+        """Convert a Python integer to size_t"""
+        return x
+
+    def create_string_buffer(init_or_size, size=None):
+        """Allocate the given amount of bytes (initially set to 0)"""
+
+        if isinstance(init_or_size, bytes):
+            size = max(len(init_or_size) + 1, size)
+            result = ffi.new("uint8_t[]", size)
+            result[:] = init_or_size
+        else:
+            if size:
+                raise ValueError("Size must be specified once only")
+            result = ffi.new("uint8_t[]", init_or_size)
+        return result
+
+    def get_c_string(c_string):
+        """Convert a C string into a Python byte sequence"""
+        return ffi.string(c_string)
+
+    def get_raw_buffer(buf):
+        """Convert a C buffer into a Python byte sequence"""
+        return ffi.buffer(buf)[:]
+
+    def c_uint8_ptr(data):
+        if isinstance(data, _buffer_type):
+            # This only works for cffi >= 1.7
+            return ffi.cast(uint8_t_type, ffi.from_buffer(data))
+        elif byte_string(data) or isinstance(data, _Array):
+            return data
+        else:
+            raise TypeError("Object type %s cannot be passed to C code" % type(data))
+
+    class VoidPointer_cffi(_VoidPointer):
+        """Model a newly allocated pointer to void"""
+
+        def __init__(self):
+            self._pp = ffi.new("void *[1]")
+
+        def get(self):
+            return self._pp[0]
+
+        def address_of(self):
+            return self._pp
+
+    def VoidPointer():
+        return VoidPointer_cffi()
+
+    backend = "cffi"
+
+except ImportError:
+
+    import ctypes
+    from ctypes import (CDLL, c_void_p, byref, c_ulong, c_ulonglong, c_size_t,
+                        create_string_buffer, c_ubyte, c_uint)
+    from ctypes.util import find_library
+    from ctypes import Array as _Array
+
+    null_pointer = None
+    cached_architecture = []
+
+    def c_ubyte(c):
+        if not (0 <= c < 256):
+            raise OverflowError()
+        return ctypes.c_ubyte(c)
+
+    def load_lib(name, cdecl):
+        if not cached_architecture:
+            # platform.architecture() creates a subprocess, so caching the
+            # result makes successive imports faster.
+            import platform
+            cached_architecture[:] = platform.architecture()
+        bits, linkage = cached_architecture
+        if "." not in name and not linkage.startswith("Win"):
+            full_name = find_library(name)
+            if full_name is None:
+                raise OSError("Cannot load library '%s'" % name)
+            name = full_name
+        return CDLL(name)
+
+    def get_c_string(c_string):
+        return c_string.value
+
+    def get_raw_buffer(buf):
+        return buf.raw
+
+    # ---- Get raw pointer ---
+
+    _c_ssize_t = ctypes.c_ssize_t
+
+    _PyBUF_SIMPLE = 0
+    _PyObject_GetBuffer = ctypes.pythonapi.PyObject_GetBuffer
+    _PyBuffer_Release = ctypes.pythonapi.PyBuffer_Release
+    _py_object = ctypes.py_object
+    _c_ssize_p = ctypes.POINTER(_c_ssize_t)
+
+    # See Include/object.h for CPython
+    # and https://github.com/pallets/click/blob/master/src/click/_winconsole.py
+    class _Py_buffer(ctypes.Structure):
+        _fields_ = [
+            ('buf',         c_void_p),
+            ('obj',         ctypes.py_object),
+            ('len',         _c_ssize_t),
+            ('itemsize',    _c_ssize_t),
+            ('readonly',    ctypes.c_int),
+            ('ndim',        ctypes.c_int),
+            ('format',      ctypes.c_char_p),
+            ('shape',       _c_ssize_p),
+            ('strides',     _c_ssize_p),
+            ('suboffsets',  _c_ssize_p),
+            ('internal',    c_void_p)
+        ]
+
+        # Extra field for CPython 2.6/2.7
+        if sys.version_info[0] == 2:
+            _fields_.insert(-1, ('smalltable', _c_ssize_t * 2))
+
+    def c_uint8_ptr(data):
+        if byte_string(data) or isinstance(data, _Array):
+            return data
+        elif isinstance(data, _buffer_type):
+            obj = _py_object(data)
+            buf = _Py_buffer()
+            _PyObject_GetBuffer(obj, byref(buf), _PyBUF_SIMPLE)
+            try:
+                buffer_type = ctypes.c_ubyte * buf.len
+                return buffer_type.from_address(buf.buf)
+            finally:
+                _PyBuffer_Release(byref(buf))
+        else:
+            raise TypeError("Object type %s cannot be passed to C code" % type(data))
+
+    # ---
+
+    class VoidPointer_ctypes(_VoidPointer):
+        """Model a newly allocated pointer to void"""
+
+        def __init__(self):
+            self._p = c_void_p()
+
+        def get(self):
+            return self._p
+
+        def address_of(self):
+            return byref(self._p)
+
+    def VoidPointer():
+        return VoidPointer_ctypes()
+
+    backend = "ctypes"
+
+
+class SmartPointer(object):
+    """Class to hold a non-managed piece of memory"""
+
+    def __init__(self, raw_pointer, destructor):
+        self._raw_pointer = raw_pointer
+        self._destructor = destructor
+
+    def get(self):
+        return self._raw_pointer
+
+    def release(self):
+        rp, self._raw_pointer = self._raw_pointer, None
+        return rp
+
+    def __del__(self):
+        try:
+            if self._raw_pointer is not None:
+                self._destructor(self._raw_pointer)
+                self._raw_pointer = None
+        except AttributeError:
+            pass
+
+
+def load_pycryptodome_raw_lib(name, cdecl):
+    """Load a shared library and return a handle to it.
+
+    @name,  the name of the library expressed as a PyCryptodome module,
+            for instance Crypto.Cipher._raw_cbc.
+
+    @cdecl, the C function declarations.
+    """
+
+    split = name.split(".")
+    dir_comps, basename = split[:-1], split[-1]
+    attempts = []
+    for ext in extension_suffixes:
+        try:
+            filename = basename + ext
+            full_name = pycryptodome_filename(dir_comps, filename)
+            if not os.path.isfile(full_name):
+                attempts.append("Not found '%s'" % filename)
+                continue
+            return load_lib(full_name, cdecl)
+        except OSError as exp:
+            attempts.append("Cannot load '%s': %s" % (filename, str(exp)))
+    raise OSError("Cannot load native module '%s': %s" % (name, ", ".join(attempts)))
+
+
+def is_buffer(x):
+    """Return True if object x supports the buffer interface"""
+    return isinstance(x, (bytes, bytearray, memoryview))
+
+
+def is_writeable_buffer(x):
+    return (isinstance(x, bytearray) or
+            (isinstance(x, memoryview) and not x.readonly))

backend/venv/Lib/site-packages/Crypto/Util/_raw_api.pyi

@@ -0,0 +1,27 @@
+from typing import Any, Optional, Union
+
+def load_lib(name: str, cdecl: str) -> Any : ...
+def c_ulong(x: int ) -> Any : ...
+def c_ulonglong(x: int ) -> Any : ...
+def c_size_t(x: int) -> Any : ...
+def create_string_buffer(init_or_size: Union[bytes,int], size: Optional[int]) -> Any : ...
+def get_c_string(c_string: Any) -> bytes : ...
+def get_raw_buffer(buf: Any) -> bytes : ...
+def c_uint8_ptr(data: Union[bytes, memoryview, bytearray]) -> Any : ...
+
+class VoidPointer(object):
+    def get(self) -> Any : ...
+    def address_of(self) -> Any : ...
+
+class SmartPointer(object):
+    def __init__(self, raw_pointer: Any, destructor: Any) -> None : ...
+    def get(self) -> Any : ...
+    def release(self) -> Any : ...
+
+backend : str
+null_pointer : Any
+ffi: Any
+
+def load_pycryptodome_raw_lib(name: str, cdecl: str) -> Any : ...
+def is_buffer(x: Any) -> bool : ...
+def is_writeable_buffer(x: Any) -> bool : ...

backend/venv/Lib/site-packages/Crypto/Util/asn1.pyi

@@ -0,0 +1,80 @@
+from typing import Optional, Sequence, Union, Set, Iterable
+
+__all__ = ['DerObject', 'DerInteger', 'DerOctetString', 'DerNull',
+           'DerSequence', 'DerObjectId', 'DerBitString', 'DerSetOf']
+
+# TODO: Make the encoded DerObjects their own type, so that DerSequence and
+# DerSetOf can check their contents better
+
+class BytesIO_EOF:
+    def __init__(self, initial_bytes: bytes) -> None: ...
+    def set_bookmark(self) -> None: ...
+    def data_since_bookmark(self) -> bytes: ...
+    def remaining_data(self) -> int: ...
+    def read(self, length: int) -> bytes: ...
+    def read_byte(self) -> bytes: ...
+
+class DerObject:
+    payload: bytes
+    def __init__(self, asn1Id: Optional[int]=None, payload: Optional[bytes]=..., implicit: Optional[int]=None,
+                 constructed: Optional[bool]=False, explicit: Optional[int]=None) -> None: ...
+    def encode(self) -> bytes: ...
+    def decode(self, der_encoded: bytes, strict: bool=...) -> DerObject: ...
+
+class DerInteger(DerObject):
+    value: int
+    def __init__(self, value: Optional[int]= 0, implicit: Optional[int]=None, explicit: Optional[int]=None) -> None: ...
+    def encode(self) -> bytes: ...
+    def decode(self, der_encoded: bytes, strict: bool=...) -> DerInteger: ...
+
+class DerBoolean(DerObject):
+    value: bool
+    def __init__(self, value: bool=..., implicit: Optional[Union[int, bytes]]=..., explicit: Optional[Union[int, bytes]]=...) -> None: ...
+    def encode(self) -> bytes: ...
+    def decode(self, der_encoded: bytes, strict: bool=...) -> DerBoolean: ...
+
+class DerSequence(DerObject):
+    def __init__(self, startSeq: Optional[Sequence[Union[int, DerInteger, DerObject]]]=None, implicit: Optional[int]=None) -> None: ...
+    def __delitem__(self, n: int) -> None: ...
+    def __getitem__(self, n: int) -> None: ...
+    def __setitem__(self, key: int, value: DerObject) -> None: ...
+    def __setslice__(self, i: int, j: int, sequence: Sequence) -> None: ...
+    def __delslice__(self, i: int, j: int) -> None: ...
+    def __getslice__(self, i: int, j: int) -> DerSequence: ...
+    def __len__(self) -> int: ...
+    def __iadd__(self, item: DerObject) -> DerSequence: ...
+    def append(self, item: DerObject) -> DerSequence: ...
+    def hasInts(self, only_non_negative: Optional[bool]=True) -> int: ...
+    def hasOnlyInts(self, only_non_negative: Optional[bool]=True) -> bool: ...
+    def encode(self) -> bytes: ...
+    def decode(self, der_encoded: bytes, strict: bool=..., nr_elements: Optional[int]=None, only_ints_expected: Optional[bool]=False) -> DerSequence: ...
+
+class DerOctetString(DerObject):
+    payload: bytes
+    def __init__(self, value: Optional[bytes]=..., implicit: Optional[int]=None) -> None: ...
+
+class DerNull(DerObject):
+    def __init__(self) -> None: ...
+
+class DerObjectId(DerObject):
+    value: str
+    def __init__(self, value: Optional[str]=..., implicit: Optional[int]=None, explicit: Optional[int]=None) -> None: ...
+    def encode(self) -> bytes: ...
+    def decode(self, der_encoded: bytes, strict: bool=...) -> DerObjectId: ...
+
+class DerBitString(DerObject):
+    value: bytes
+    def __init__(self, value: Optional[bytes]=..., implicit: Optional[int]=None, explicit: Optional[int]=None) -> None: ...
+    def encode(self) -> bytes: ...
+    def decode(self, der_encoded: bytes, strict: bool=...) -> DerBitString: ...
+
+DerSetElement = Union[bytes, int]
+
+class DerSetOf(DerObject):
+    def __init__(self, startSet: Optional[Set[DerSetElement]]=None, implicit: Optional[int]=None) -> None: ...
+    def __getitem__(self, n: int) -> DerSetElement: ...
+    def __iter__(self) -> Iterable: ...
+    def __len__(self) -> int: ...
+    def add(self, elem: DerSetElement) -> None: ...
+    def decode(self, der_encoded: bytes, strict: bool=...) -> DerObject: ...
+    def encode(self) -> bytes: ...

backend/venv/Lib/site-packages/Crypto/Util/number.pyi

@@ -0,0 +1,19 @@
+from typing import List, Optional, Callable
+
+
+def ceil_div(n: int, d: int) -> int: ...
+def size (N: int) -> int: ...
+def getRandomInteger(N: int, randfunc: Optional[Callable]=None) -> int: ...
+def getRandomRange(a: int, b: int, randfunc: Optional[Callable]=None) -> int: ...
+def getRandomNBitInteger(N: int, randfunc: Optional[Callable]=None) -> int: ...
+def GCD(x: int,y: int) -> int: ...
+def inverse(u: int, v: int) -> int: ...
+def getPrime(N: int, randfunc: Optional[Callable]=None) -> int: ...
+def getStrongPrime(N: int, e: Optional[int]=0, false_positive_prob: Optional[float]=1e-6, randfunc: Optional[Callable]=None) -> int: ...
+def isPrime(N: int, false_positive_prob: Optional[float]=1e-6, randfunc: Optional[Callable]=None) -> bool: ...
+def long_to_bytes(n: int, blocksize: Optional[int]=0) -> bytes: ...
+def bytes_to_long(s: bytes) -> int: ...
+def long2str(n: int, blocksize: Optional[int]=0) -> bytes: ...
+def str2long(s: bytes) -> int: ...
+
+sieve_base: List[int]

backend/venv/Lib/site-packages/Crypto/Util/py3compat.py

@@ -0,0 +1,185 @@
+# -*- coding: utf-8 -*-
+#
+#  Util/py3compat.py : Compatibility code for handling Py3k / Python 2.x
+#
+# Written in 2010 by Thorsten Behrens
+#
+# ===================================================================
+# The contents of this file are dedicated to the public domain.  To
+# the extent that dedication to the public domain is not available,
+# everyone is granted a worldwide, perpetual, royalty-free,
+# non-exclusive license to exercise all rights associated with the
+# contents of this file for any purpose whatsoever.
+# No rights are reserved.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+# ===================================================================
+
+"""Compatibility code for handling string/bytes changes from Python 2.x to Py3k
+
+In Python 2.x, strings (of type ''str'') contain binary data, including encoded
+Unicode text (e.g. UTF-8).  The separate type ''unicode'' holds Unicode text.
+Unicode literals are specified via the u'...' prefix.  Indexing or slicing
+either type always produces a string of the same type as the original.
+Data read from a file is always of '''str'' type.
+
+In Python 3.x, strings (type ''str'') may only contain Unicode text. The u'...'
+prefix and the ''unicode'' type are now redundant.  A new type (called
+''bytes'') has to be used for binary data (including any particular
+''encoding'' of a string).  The b'...' prefix allows one to specify a binary
+literal.  Indexing or slicing a string produces another string.  Slicing a byte
+string produces another byte string, but the indexing operation produces an
+integer.  Data read from a file is of '''str'' type if the file was opened in
+text mode, or of ''bytes'' type otherwise.
+
+Since PyCrypto aims at supporting both Python 2.x and 3.x, the following helper
+functions are used to keep the rest of the library as independent as possible
+from the actual Python version.
+
+In general, the code should always deal with binary strings, and use integers
+instead of 1-byte character strings.
+
+b(s)
+    Take a text string literal (with no prefix or with u'...' prefix) and
+    make a byte string.
+bchr(c)
+    Take an integer and make a 1-character byte string.
+bord(c)
+    Take the result of indexing on a byte string and make an integer.
+tobytes(s)
+    Take a text string, a byte string, or a sequence of character taken from
+    a byte string and make a byte string.
+"""
+
+import sys
+import abc
+
+
+if sys.version_info[0] == 2:
+    def b(s):
+        return s
+    def bchr(s):
+        return chr(s)
+    def bstr(s):
+        return str(s)
+    def bord(s):
+        return ord(s)
+    def tobytes(s, encoding="latin-1"):
+        if isinstance(s, unicode):
+            return s.encode(encoding)
+        elif isinstance(s, str):
+            return s
+        elif isinstance(s, bytearray):
+            return bytes(s)
+        elif isinstance(s, memoryview):
+            return s.tobytes()
+        else:
+            return ''.join(s)
+    def tostr(bs):
+        return bs
+    def byte_string(s):
+        return isinstance(s, str)
+
+    # In Python 2, a memoryview does not support concatenation
+    def concat_buffers(a, b):
+        if isinstance(a, memoryview):
+            a = a.tobytes()
+        if isinstance(b, memoryview):
+            b = b.tobytes()
+        return a + b
+
+    from StringIO import StringIO
+    BytesIO = StringIO
+
+    from sys import maxint
+
+    iter_range = xrange
+
+    def is_native_int(x):
+        return isinstance(x, (int, long))
+
+    def is_string(x):
+        return isinstance(x, basestring)
+
+    def is_bytes(x):
+        return isinstance(x, str) or \
+                isinstance(x, bytearray) or \
+                isinstance(x, memoryview)
+
+    ABC = abc.ABCMeta('ABC', (object,), {'__slots__': ()})
+
+    FileNotFoundError = IOError
+
+else:
+    def b(s):
+       return s.encode("latin-1") # utf-8 would cause some side-effects we don't want
+    def bchr(s):
+        return bytes([s])
+    def bstr(s):
+        if isinstance(s,str):
+            return bytes(s,"latin-1")
+        else:
+            return bytes(s)
+    def bord(s):
+        return s
+    def tobytes(s, encoding="latin-1"):
+        if isinstance(s, bytes):
+            return s
+        elif isinstance(s, bytearray):
+            return bytes(s)
+        elif isinstance(s,str):
+            return s.encode(encoding)
+        elif isinstance(s, memoryview):
+            return s.tobytes()
+        else:
+            return bytes([s])
+    def tostr(bs):
+        return bs.decode("latin-1")
+    def byte_string(s):
+        return isinstance(s, bytes)
+
+    def concat_buffers(a, b):
+        return a + b
+
+    from io import BytesIO
+    from io import StringIO
+    from sys import maxsize as maxint
+
+    iter_range = range
+
+    def is_native_int(x):
+        return isinstance(x, int)
+
+    def is_string(x):
+        return isinstance(x, str)
+
+    def is_bytes(x):
+        return isinstance(x, bytes) or \
+                isinstance(x, bytearray) or \
+                isinstance(x, memoryview)
+
+    from abc import ABC
+
+    FileNotFoundError = FileNotFoundError
+
+
+def _copy_bytes(start, end, seq):
+    """Return an immutable copy of a sequence (byte string, byte array, memoryview)
+    in a certain interval [start:seq]"""
+
+    if isinstance(seq, memoryview):
+        return seq[start:end].tobytes()
+    elif isinstance(seq, bytearray):
+        return bytes(seq[start:end])
+    else:
+        return seq[start:end]
+
+del sys
+del abc

backend/venv/Lib/site-packages/Crypto/Util/py3compat.pyi

@@ -0,0 +1,33 @@
+from typing import Union, Any, Optional, IO
+
+Buffer = Union[bytes, bytearray, memoryview]
+
+import sys
+
+def b(s: str) -> bytes: ...
+def bchr(s: int) -> bytes: ...
+def bord(s: bytes) -> int: ...
+def tobytes(s: Union[bytes, str]) -> bytes: ...
+def tostr(b: bytes) -> str: ...
+def bytestring(x: Any) -> bool: ...
+
+def is_native_int(s: Any) -> bool: ...
+def is_string(x: Any) -> bool: ...
+def is_bytes(x: Any) -> bool: ...
+
+def BytesIO(b: bytes) -> IO[bytes]: ...
+def StringIO(s: str) -> IO[str]: ...
+
+if sys.version_info[0] == 2:
+    from sys import maxint
+    iter_range = xrange
+
+else:
+    from sys import maxsize as maxint
+    iter_range = range
+
+class FileNotFoundError:
+    def __init__(self, err: int, msg: str, filename: str) -> None:
+        pass
+
+def _copy_bytes(start: Optional[int], end: Optional[int], seq: Buffer) -> bytes: ...

backend/venv/Lib/site-packages/Crypto/Util/strxor.py

@@ -0,0 +1,146 @@
+# ===================================================================
+#
+# Copyright (c) 2014, Legrandin <helderijs@gmail.com>
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+# ===================================================================
+
+from Crypto.Util._raw_api import (load_pycryptodome_raw_lib, c_size_t,
+                                  create_string_buffer, get_raw_buffer,
+                                  c_uint8_ptr, is_writeable_buffer)
+
+_raw_strxor = load_pycryptodome_raw_lib(
+                    "Crypto.Util._strxor",
+                    """
+                    void strxor(const uint8_t *in1,
+                                const uint8_t *in2,
+                                uint8_t *out, size_t len);
+                    void strxor_c(const uint8_t *in,
+                                  uint8_t c,
+                                  uint8_t *out,
+                                  size_t len);
+                    """)
+
+
+def strxor(term1, term2, output=None):
+    """From two byte strings of equal length,
+    create a third one which is the byte-by-byte XOR of the two.
+
+    Args:
+      term1 (bytes/bytearray/memoryview):
+        The first byte string to XOR.
+      term2 (bytes/bytearray/memoryview):
+        The second byte string to XOR.
+      output (bytearray/memoryview):
+        The location where the result will be written to.
+        It must have the same length as ``term1`` and ``term2``.
+        If ``None``, the result is returned.
+    :Return:
+        If ``output`` is ``None``, a new byte string with the result.
+        Otherwise ``None``.
+
+    .. note::
+        ``term1`` and ``term2`` must have the same length.
+    """
+
+    if len(term1) != len(term2):
+        raise ValueError("Only byte strings of equal length can be xored")
+
+    if output is None:
+        result = create_string_buffer(len(term1))
+    else:
+        # Note: output may overlap with either input
+        result = output
+
+        if not is_writeable_buffer(output):
+            raise TypeError("output must be a bytearray or a writeable memoryview")
+
+        if len(term1) != len(output):
+            raise ValueError("output must have the same length as the input"
+                             "  (%d bytes)" % len(term1))
+
+    _raw_strxor.strxor(c_uint8_ptr(term1),
+                       c_uint8_ptr(term2),
+                       c_uint8_ptr(result),
+                       c_size_t(len(term1)))
+
+    if output is None:
+        return get_raw_buffer(result)
+    else:
+        return None
+
+
+def strxor_c(term, c, output=None):
+    """From a byte string, create a second one of equal length
+    where each byte is XOR-red with the same value.
+
+    Args:
+      term(bytes/bytearray/memoryview):
+        The byte string to XOR.
+      c (int):
+        Every byte in the string will be XOR-ed with this value.
+        It must be between 0 and 255 (included).
+      output (None or bytearray/memoryview):
+        The location where the result will be written to.
+        It must have the same length as ``term``.
+        If ``None``, the result is returned.
+
+    Return:
+        If ``output`` is ``None``, a new ``bytes`` string with the result.
+        Otherwise ``None``.
+    """
+
+    if not 0 <= c < 256:
+        raise ValueError("c must be in range(256)")
+
+    if output is None:
+        result = create_string_buffer(len(term))
+    else:
+        # Note: output may overlap with either input
+        result = output
+
+        if not is_writeable_buffer(output):
+            raise TypeError("output must be a bytearray or a writeable memoryview")
+
+        if len(term) != len(output):
+            raise ValueError("output must have the same length as the input"
+                             "  (%d bytes)" % len(term))
+
+    _raw_strxor.strxor_c(c_uint8_ptr(term),
+                         c,
+                         c_uint8_ptr(result),
+                         c_size_t(len(term))
+                         )
+
+    if output is None:
+        return get_raw_buffer(result)
+    else:
+        return None
+
+
+def _strxor_direct(term1, term2, result):
+    """Very fast XOR - check conditions!"""
+    _raw_strxor.strxor(term1, term2, result, c_size_t(len(term1)))

backend/venv/Lib/site-packages/Crypto/Util/strxor.pyi

@@ -0,0 +1,6 @@
+from typing import Union, Optional
+
+Buffer = Union[bytes, bytearray, memoryview]
+
+def strxor(term1: bytes, term2: bytes, output: Optional[Buffer]=...) -> bytes: ...
+def strxor_c(term: bytes, c: int, output: Optional[Buffer]=...) -> bytes: ...