diff --git a/venv/Lib/site-packages/passlib/crypto/_blowfish/__init__.py b/venv/Lib/site-packages/passlib/crypto/_blowfish/__init__.py
new file mode 100644
index 0000000..1aa1c85
--- /dev/null
+++ b/venv/Lib/site-packages/passlib/crypto/_blowfish/__init__.py
@@ -0,0 +1,169 @@
+"""passlib.crypto._blowfish - pure-python eks-blowfish implementation for bcrypt
+
+This is a pure-python implementation of the EKS-Blowfish algorithm described by
+Provos and Mazieres in `A Future-Adaptable Password Scheme
+<http://www.openbsd.org/papers/bcrypt-paper.ps>`_.
+
+This package contains two submodules:
+
+* ``_blowfish/base.py`` contains a class implementing the eks-blowfish algorithm
+  using easy-to-examine code.
+
+* ``_blowfish/unrolled.py`` contains a subclass which replaces some methods
+  of the original class with sped-up versions, mainly using unrolled loops
+  and local variables. this is the class which is actually used by
+  Passlib to perform BCrypt in pure python.
+
+  This module is auto-generated by a script, ``_blowfish/_gen_files.py``.
+
+Status
+------
+This implementation is usable, but is an order of magnitude too slow to be
+usable with real security. For "ok" security, BCrypt hashes should have at
+least 2**11 rounds (as of 2011). Assuming a desired response time <= 100ms,
+this means a BCrypt implementation should get at least 20 rounds/ms in order
+to be both usable *and* secure. On a 2 ghz cpu, this implementation gets
+roughly 0.09 rounds/ms under CPython (220x too slow), and 1.9 rounds/ms
+under PyPy (10x too slow).
+
+History
+-------
+While subsequently modified considerly for Passlib, this code was originally
+based on `jBcrypt 0.2 <http://www.mindrot.org/projects/jBCrypt/>`_, which was
+released under the BSD license::
+
+    Copyright (c) 2006 Damien Miller <djm@mindrot.org>
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+"""
+#=============================================================================
+# imports
+#=============================================================================
+# core
+from itertools import chain
+import struct
+# pkg
+from passlib.utils import getrandbytes, rng
+from passlib.utils.binary import bcrypt64
+from passlib.utils.compat import BytesIO, unicode, u, native_string_types
+from passlib.crypto._blowfish.unrolled import BlowfishEngine
+# local
+__all__ = [
+    'BlowfishEngine',
+    'raw_bcrypt',
+]
+
+#=============================================================================
+# bcrypt constants
+#=============================================================================
+
+# bcrypt constant data "OrpheanBeholderScryDoubt" as 6 integers
+BCRYPT_CDATA = [
+    0x4f727068, 0x65616e42, 0x65686f6c,
+    0x64657253, 0x63727944, 0x6f756274
+]
+
+# struct used to encode ciphertext as digest (last output byte discarded)
+digest_struct = struct.Struct(">6I")
+
+#=============================================================================
+# base bcrypt helper
+#
+# interface designed only for use by passlib.handlers.bcrypt:BCrypt
+# probably not suitable for other purposes
+#=============================================================================
+BNULL = b'\x00'
+
+def raw_bcrypt(password, ident, salt, log_rounds):
+    """perform central password hashing step in bcrypt scheme.
+
+    :param password: the password to hash
+    :param ident: identifier w/ minor version (e.g. 2, 2a)
+    :param salt: the binary salt to use (encoded in bcrypt-base64)
+    :param log_rounds: the log2 of the number of rounds (as int)
+    :returns: bcrypt-base64 encoded checksum
+    """
+    #===================================================================
+    # parse inputs
+    #===================================================================
+
+    # parse ident
+    assert isinstance(ident, native_string_types)
+    add_null_padding = True
+    if ident == u('2a') or ident == u('2y') or ident == u('2b'):
+        pass
+    elif ident == u('2'):
+        add_null_padding = False
+    elif ident == u('2x'):
+        raise ValueError("crypt_blowfish's buggy '2x' hashes are not "
+                         "currently supported")
+    else:
+        raise ValueError("unknown ident: %r" % (ident,))
+
+    # decode & validate salt
+    assert isinstance(salt, bytes)
+    salt = bcrypt64.decode_bytes(salt)
+    if len(salt) < 16:
+        raise ValueError("Missing salt bytes")
+    elif len(salt) > 16:
+        salt = salt[:16]
+
+    # prepare password
+    assert isinstance(password, bytes)
+    if add_null_padding:
+        password += BNULL
+
+    # validate rounds
+    if log_rounds < 4 or log_rounds > 31:
+        raise ValueError("Bad number of rounds")
+
+    #===================================================================
+    #
+    # run EKS-Blowfish algorithm
+    #
+    # This uses the "enhanced key schedule" step described by
+    # Provos and Mazieres in "A Future-Adaptable Password Scheme"
+    # http://www.openbsd.org/papers/bcrypt-paper.ps
+    #
+    #===================================================================
+
+    engine = BlowfishEngine()
+
+    # convert password & salt into list of 18 32-bit integers (72 bytes total).
+    pass_words = engine.key_to_words(password)
+    salt_words = engine.key_to_words(salt)
+
+    # truncate salt_words to original 16 byte salt, or loop won't wrap
+    # correctly when passed to .eks_salted_expand()
+    salt_words16 = salt_words[:4]
+
+    # do EKS key schedule setup
+    engine.eks_salted_expand(pass_words, salt_words16)
+
+    # apply password & salt keys to key schedule a bunch more times.
+    rounds = 1<<log_rounds
+    engine.eks_repeated_expand(pass_words, salt_words, rounds)
+
+    # encipher constant data, and encode to bytes as digest.
+    data = list(BCRYPT_CDATA)
+    i = 0
+    while i < 6:
+        data[i], data[i+1] = engine.repeat_encipher(data[i], data[i+1], 64)
+        i += 2
+    raw = digest_struct.pack(*data)[:-1]
+    return bcrypt64.encode_bytes(raw)
+
+#=============================================================================
+# eof
+#=============================================================================
diff --git a/venv/Lib/site-packages/passlib/crypto/_blowfish/_gen_files.py b/venv/Lib/site-packages/passlib/crypto/_blowfish/_gen_files.py
new file mode 100644
index 0000000..2f92cf8
--- /dev/null
+++ b/venv/Lib/site-packages/passlib/crypto/_blowfish/_gen_files.py
@@ -0,0 +1,204 @@
+"""passlib.crypto._blowfish._gen_files - meta script that generates unrolled.py"""
+#=============================================================================
+# imports
+#=============================================================================
+# core
+import os
+import textwrap
+# pkg
+from passlib.utils.compat import irange
+# local
+
+#=============================================================================
+# helpers
+#=============================================================================
+def varlist(name, count):
+    return ", ".join(name + str(x) for x in irange(count))
+
+
+def indent_block(block, padding):
+    """ident block of text"""
+    lines = block.split("\n")
+    return "\n".join(
+        padding + line if line else ""
+        for line in lines
+    )
+
+BFSTR = """\
+                ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                  S3[l & 0xff]) & 0xffffffff)
+""".strip()
+
+def render_encipher(write, indent=0):
+    for i in irange(0, 15, 2):
+        write(indent, """\
+            # Feistel substitution on left word (round %(i)d)
+            r ^= %(left)s ^ p%(i1)d
+
+            # Feistel substitution on right word (round %(i1)d)
+            l ^= %(right)s ^ p%(i2)d
+        """, i=i, i1=i+1, i2=i+2,
+             left=BFSTR, right=BFSTR.replace("l","r"),
+             )
+
+def write_encipher_function(write, indent=0):
+    write(indent, """\
+        def encipher(self, l, r):
+            \"""blowfish encipher a single 64-bit block encoded as two 32-bit ints\"""
+
+            (p0, p1, p2, p3, p4, p5, p6, p7, p8, p9,
+              p10, p11, p12, p13, p14, p15, p16, p17) = self.P
+            S0, S1, S2, S3 = self.S
+
+            l ^= p0
+
+            """)
+    render_encipher(write, indent+1)
+
+    write(indent+1, """\
+
+        return r ^ p17, l
+
+        """)
+
+def write_expand_function(write, indent=0):
+    write(indent, """\
+        def expand(self, key_words):
+            \"""unrolled version of blowfish key expansion\"""
+            ##assert len(key_words) >= 18, "size of key_words must be >= 18"
+
+            P, S = self.P, self.S
+            S0, S1, S2, S3 = S
+
+            #=============================================================
+            # integrate key
+            #=============================================================
+        """)
+    for i in irange(18):
+        write(indent+1, """\
+            p%(i)d = P[%(i)d] ^ key_words[%(i)d]
+        """, i=i)
+    write(indent+1, """\
+
+        #=============================================================
+        # update P
+        #=============================================================
+
+        #------------------------------------------------
+        # update P[0] and P[1]
+        #------------------------------------------------
+        l, r = p0, 0
+
+        """)
+
+    render_encipher(write, indent+1)
+
+    write(indent+1, """\
+
+        p0, p1 = l, r = r ^ p17, l
+
+        """)
+
+    for i in irange(2, 18, 2):
+        write(indent+1, """\
+            #------------------------------------------------
+            # update P[%(i)d] and P[%(i1)d]
+            #------------------------------------------------
+            l ^= p0
+
+            """, i=i, i1=i+1)
+
+        render_encipher(write, indent+1)
+
+        write(indent+1, """\
+            p%(i)d, p%(i1)d = l, r = r ^ p17, l
+
+            """, i=i, i1=i+1)
+
+    write(indent+1, """\
+
+        #------------------------------------------------
+        # save changes to original P array
+        #------------------------------------------------
+        P[:] = (p0, p1, p2, p3, p4, p5, p6, p7, p8, p9,
+          p10, p11, p12, p13, p14, p15, p16, p17)
+
+        #=============================================================
+        # update S
+        #=============================================================
+
+        for box in S:
+            j = 0
+            while j < 256:
+                l ^= p0
+
+        """)
+
+    render_encipher(write, indent+3)
+
+    write(indent+3, """\
+
+                box[j], box[j+1] = l, r = r ^ p17, l
+                j += 2
+        """)
+
+#=============================================================================
+# main
+#=============================================================================
+
+def main():
+    target = os.path.join(os.path.dirname(__file__), "unrolled.py")
+    fh = file(target, "w")
+
+    def write(indent, msg, **kwds):
+        literal = kwds.pop("literal", False)
+        if kwds:
+            msg %= kwds
+        if not literal:
+            msg = textwrap.dedent(msg.rstrip(" "))
+        if indent:
+            msg = indent_block(msg, " " * (indent*4))
+        fh.write(msg)
+
+    write(0, """\
+        \"""passlib.crypto._blowfish.unrolled - unrolled loop implementation of bcrypt,
+        autogenerated by _gen_files.py
+
+        currently this override the encipher() and expand() methods
+        with optimized versions, and leaves the other base.py methods alone.
+        \"""
+        #=================================================================
+        # imports
+        #=================================================================
+        # pkg
+        from passlib.crypto._blowfish.base import BlowfishEngine as _BlowfishEngine
+        # local
+        __all__ = [
+            "BlowfishEngine",
+        ]
+        #=================================================================
+        #
+        #=================================================================
+        class BlowfishEngine(_BlowfishEngine):
+
+        """)
+
+    write_encipher_function(write, indent=1)
+    write_expand_function(write, indent=1)
+
+    write(0, """\
+            #=================================================================
+            # eoc
+            #=================================================================
+
+        #=================================================================
+        # eof
+        #=================================================================
+        """)
+
+if __name__ == "__main__":
+    main()
+
+#=============================================================================
+# eof
+#=============================================================================
diff --git a/venv/Lib/site-packages/passlib/crypto/_blowfish/base.py b/venv/Lib/site-packages/passlib/crypto/_blowfish/base.py
new file mode 100644
index 0000000..7b4f2cb
--- /dev/null
+++ b/venv/Lib/site-packages/passlib/crypto/_blowfish/base.py
@@ -0,0 +1,441 @@
+"""passlib.crypto._blowfish.base - unoptimized pure-python blowfish engine"""
+#=============================================================================
+# imports
+#=============================================================================
+# core
+import struct
+# pkg
+from passlib.utils import repeat_string
+# local
+__all__ = [
+    "BlowfishEngine",
+]
+
+#=============================================================================
+# blowfish constants
+#=============================================================================
+BLOWFISH_P = BLOWFISH_S = None
+
+def _init_constants():
+    global BLOWFISH_P, BLOWFISH_S
+
+    # NOTE: blowfish's spec states these numbers are the hex representation
+    # of the fractional portion of PI, in order.
+
+    # Initial contents of key schedule - 18 integers
+    BLOWFISH_P = [
+        0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344,
+        0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89,
+        0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
+        0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917,
+        0x9216d5d9, 0x8979fb1b,
+    ]
+
+    # all 4 blowfish S boxes in one array - 256 integers per S box
+    BLOWFISH_S = [
+        # sbox 1
+        [
+        0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7,
+        0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99,
+        0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
+        0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e,
+        0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee,
+        0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
+        0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef,
+        0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e,
+        0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
+        0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440,
+        0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce,
+        0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
+        0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e,
+        0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677,
+        0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
+        0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032,
+        0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88,
+        0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
+        0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e,
+        0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0,
+        0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
+        0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98,
+        0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88,
+        0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
+        0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6,
+        0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d,
+        0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
+        0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7,
+        0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba,
+        0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
+        0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f,
+        0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09,
+        0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
+        0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb,
+        0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279,
+        0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
+        0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab,
+        0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82,
+        0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
+        0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573,
+        0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0,
+        0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
+        0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790,
+        0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8,
+        0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
+        0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0,
+        0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7,
+        0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
+        0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad,
+        0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1,
+        0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
+        0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9,
+        0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477,
+        0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
+        0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49,
+        0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af,
+        0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
+        0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5,
+        0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41,
+        0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
+        0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400,
+        0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915,
+        0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
+        0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a,
+        ],
+        # sbox 2
+        [
+        0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623,
+        0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
+        0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1,
+        0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e,
+        0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6,
+        0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
+        0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e,
+        0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
+        0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737,
+        0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8,
+        0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff,
+        0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
+        0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701,
+        0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
+        0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41,
+        0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331,
+        0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf,
+        0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
+        0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e,
+        0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
+        0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c,
+        0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2,
+        0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16,
+        0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
+        0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b,
+        0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
+        0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e,
+        0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3,
+        0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f,
+        0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
+        0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4,
+        0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
+        0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66,
+        0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28,
+        0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802,
+        0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
+        0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510,
+        0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
+        0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14,
+        0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e,
+        0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50,
+        0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
+        0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8,
+        0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
+        0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99,
+        0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696,
+        0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128,
+        0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
+        0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0,
+        0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
+        0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105,
+        0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250,
+        0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3,
+        0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
+        0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00,
+        0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
+        0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb,
+        0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e,
+        0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735,
+        0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
+        0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9,
+        0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
+        0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
+        0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7,
+        ],
+        # sbox 3
+        [
+        0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934,
+        0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068,
+        0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af,
+        0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
+        0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45,
+        0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
+        0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a,
+        0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb,
+        0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee,
+        0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
+        0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42,
+        0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
+        0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2,
+        0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb,
+        0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527,
+        0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
+        0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33,
+        0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
+        0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3,
+        0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc,
+        0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17,
+        0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
+        0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b,
+        0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
+        0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922,
+        0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728,
+        0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0,
+        0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
+        0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37,
+        0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
+        0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804,
+        0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b,
+        0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3,
+        0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
+        0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d,
+        0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
+        0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350,
+        0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9,
+        0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a,
+        0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
+        0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d,
+        0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
+        0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f,
+        0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61,
+        0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2,
+        0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
+        0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2,
+        0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
+        0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e,
+        0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633,
+        0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10,
+        0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
+        0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52,
+        0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
+        0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5,
+        0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62,
+        0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634,
+        0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
+        0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24,
+        0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
+        0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4,
+        0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c,
+        0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837,
+        0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0,
+        ],
+        # sbox 4
+        [
+        0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b,
+        0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe,
+        0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
+        0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4,
+        0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8,
+        0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
+        0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304,
+        0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22,
+        0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
+        0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6,
+        0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9,
+        0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
+        0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593,
+        0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51,
+        0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
+        0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c,
+        0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b,
+        0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
+        0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c,
+        0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd,
+        0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
+        0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319,
+        0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb,
+        0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
+        0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991,
+        0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32,
+        0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
+        0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166,
+        0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae,
+        0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
+        0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5,
+        0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47,
+        0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
+        0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d,
+        0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84,
+        0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
+        0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8,
+        0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd,
+        0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
+        0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7,
+        0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38,
+        0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
+        0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c,
+        0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525,
+        0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
+        0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442,
+        0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964,
+        0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
+        0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8,
+        0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d,
+        0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
+        0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299,
+        0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02,
+        0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
+        0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614,
+        0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a,
+        0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
+        0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b,
+        0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0,
+        0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
+        0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e,
+        0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9,
+        0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
+        0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6,
+        ]
+    ]
+
+#=============================================================================
+# engine
+#=============================================================================
+class BlowfishEngine(object):
+
+    def __init__(self):
+        if BLOWFISH_P is None:
+            _init_constants()
+        self.P = list(BLOWFISH_P)
+        self.S = [ list(box) for box in BLOWFISH_S ]
+
+    #===================================================================
+    # common helpers
+    #===================================================================
+    @staticmethod
+    def key_to_words(data, size=18):
+        """convert data to tuple of <size> 4-byte integers, repeating or
+        truncating data as needed to reach specified size"""
+        assert isinstance(data, bytes)
+        dlen = len(data)
+        if not dlen:
+            # return all zeros - original C code would just read the NUL after
+            # the password, so mimicing that behavior for this edge case.
+            return [0]*size
+
+        # repeat data until it fills up 4*size bytes
+        data = repeat_string(data, size<<2)
+
+        # unpack
+        return struct.unpack(">%dI" % (size,), data)
+
+    #===================================================================
+    # blowfish routines
+    #===================================================================
+    def encipher(self, l, r):
+        """loop version of blowfish encipher routine"""
+        P, S = self.P, self.S
+        l ^= P[0]
+        i = 1
+        while i < 17:
+            # Feistel substitution on left word
+            r = ((((S[0][l >> 24] + S[1][(l >> 16) & 0xff]) ^ S[2][(l >> 8) & 0xff]) +
+                  S[3][l & 0xff]) & 0xffffffff) ^ P[i] ^ r
+            # swap vars so even rounds do Feistel substition on right word
+            l, r = r, l
+            i += 1
+        return r ^ P[17], l
+
+    # NOTE: decipher is same as above, just with reversed(P) instead.
+
+    def expand(self, key_words):
+        """perform stock Blowfish keyschedule setup"""
+        assert len(key_words) >= 18, "key_words must be at least as large as P"
+        P, S, encipher = self.P, self.S, self.encipher
+
+        i = 0
+        while i < 18:
+            P[i] ^= key_words[i]
+            i += 1
+
+        i = l = r = 0
+        while i < 18:
+            P[i], P[i+1] = l,r = encipher(l,r)
+            i += 2
+
+        for box in S:
+            i = 0
+            while i < 256:
+                box[i], box[i+1] = l,r = encipher(l,r)
+                i += 2
+
+    #===================================================================
+    # eks-blowfish routines
+    #===================================================================
+    def eks_salted_expand(self, key_words, salt_words):
+        """perform EKS' salted version of Blowfish keyschedule setup"""
+        # NOTE: this is the same as expand(), except for the addition
+        #       of the operations involving *salt_words*.
+
+        assert len(key_words) >= 18, "key_words must be at least as large as P"
+        salt_size = len(salt_words)
+        assert salt_size, "salt_words must not be empty"
+        assert not salt_size & 1, "salt_words must have even length"
+        P, S, encipher = self.P, self.S, self.encipher
+
+        i = 0
+        while i < 18:
+            P[i] ^= key_words[i]
+            i += 1
+
+        s = i = l = r = 0
+        while i < 18:
+            l ^= salt_words[s]
+            r ^= salt_words[s+1]
+            s += 2
+            if s == salt_size:
+                s = 0
+            P[i], P[i+1] = l,r = encipher(l,r) # next()
+            i += 2
+
+        for box in S:
+            i = 0
+            while i < 256:
+                l ^= salt_words[s]
+                r ^= salt_words[s+1]
+                s += 2
+                if s == salt_size:
+                    s = 0
+                box[i], box[i+1] = l,r = encipher(l,r) # next()
+                i += 2
+
+    def eks_repeated_expand(self, key_words, salt_words, rounds):
+        """perform rounds stage of EKS keyschedule setup"""
+        expand = self.expand
+        n = 0
+        while n < rounds:
+            expand(key_words)
+            expand(salt_words)
+            n += 1
+
+    def repeat_encipher(self, l, r, count):
+        """repeatedly apply encipher operation to a block"""
+        encipher = self.encipher
+        n = 0
+        while n < count:
+            l, r = encipher(l, r)
+            n += 1
+        return l, r
+
+    #===================================================================
+    # eoc
+    #===================================================================
+
+#=============================================================================
+# eof
+#=============================================================================
diff --git a/venv/Lib/site-packages/passlib/crypto/_blowfish/unrolled.py b/venv/Lib/site-packages/passlib/crypto/_blowfish/unrolled.py
new file mode 100644
index 0000000..4acf6e1
--- /dev/null
+++ b/venv/Lib/site-packages/passlib/crypto/_blowfish/unrolled.py
@@ -0,0 +1,771 @@
+"""passlib.crypto._blowfish.unrolled - unrolled loop implementation of bcrypt,
+autogenerated by _gen_files.py
+
+currently this override the encipher() and expand() methods
+with optimized versions, and leaves the other base.py methods alone.
+"""
+#=============================================================================
+# imports
+#=============================================================================
+# pkg
+from passlib.crypto._blowfish.base import BlowfishEngine as _BlowfishEngine
+# local
+__all__ = [
+    "BlowfishEngine",
+]
+#=============================================================================
+#
+#=============================================================================
+class BlowfishEngine(_BlowfishEngine):
+
+    def encipher(self, l, r):
+        """blowfish encipher a single 64-bit block encoded as two 32-bit ints"""
+
+        (p0, p1, p2, p3, p4, p5, p6, p7, p8, p9,
+          p10, p11, p12, p13, p14, p15, p16, p17) = self.P
+        S0, S1, S2, S3 = self.S
+
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+
+        return r ^ p17, l
+
+    def expand(self, key_words):
+        """unrolled version of blowfish key expansion"""
+        ##assert len(key_words) >= 18, "size of key_words must be >= 18"
+
+        P, S = self.P, self.S
+        S0, S1, S2, S3 = S
+
+        #=============================================================
+        # integrate key
+        #=============================================================
+        p0 = P[0] ^ key_words[0]
+        p1 = P[1] ^ key_words[1]
+        p2 = P[2] ^ key_words[2]
+        p3 = P[3] ^ key_words[3]
+        p4 = P[4] ^ key_words[4]
+        p5 = P[5] ^ key_words[5]
+        p6 = P[6] ^ key_words[6]
+        p7 = P[7] ^ key_words[7]
+        p8 = P[8] ^ key_words[8]
+        p9 = P[9] ^ key_words[9]
+        p10 = P[10] ^ key_words[10]
+        p11 = P[11] ^ key_words[11]
+        p12 = P[12] ^ key_words[12]
+        p13 = P[13] ^ key_words[13]
+        p14 = P[14] ^ key_words[14]
+        p15 = P[15] ^ key_words[15]
+        p16 = P[16] ^ key_words[16]
+        p17 = P[17] ^ key_words[17]
+
+        #=============================================================
+        # update P
+        #=============================================================
+
+        #------------------------------------------------
+        # update P[0] and P[1]
+        #------------------------------------------------
+        l, r = p0, 0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+
+        p0, p1 = l, r = r ^ p17, l
+
+        #------------------------------------------------
+        # update P[2] and P[3]
+        #------------------------------------------------
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+        p2, p3 = l, r = r ^ p17, l
+
+        #------------------------------------------------
+        # update P[4] and P[5]
+        #------------------------------------------------
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+        p4, p5 = l, r = r ^ p17, l
+
+        #------------------------------------------------
+        # update P[6] and P[7]
+        #------------------------------------------------
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+        p6, p7 = l, r = r ^ p17, l
+
+        #------------------------------------------------
+        # update P[8] and P[9]
+        #------------------------------------------------
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+        p8, p9 = l, r = r ^ p17, l
+
+        #------------------------------------------------
+        # update P[10] and P[11]
+        #------------------------------------------------
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+        p10, p11 = l, r = r ^ p17, l
+
+        #------------------------------------------------
+        # update P[12] and P[13]
+        #------------------------------------------------
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+        p12, p13 = l, r = r ^ p17, l
+
+        #------------------------------------------------
+        # update P[14] and P[15]
+        #------------------------------------------------
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+        p14, p15 = l, r = r ^ p17, l
+
+        #------------------------------------------------
+        # update P[16] and P[17]
+        #------------------------------------------------
+        l ^= p0
+
+        # Feistel substitution on left word (round 0)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p1
+
+        # Feistel substitution on right word (round 1)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p2
+        # Feistel substitution on left word (round 2)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p3
+
+        # Feistel substitution on right word (round 3)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p4
+        # Feistel substitution on left word (round 4)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p5
+
+        # Feistel substitution on right word (round 5)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p6
+        # Feistel substitution on left word (round 6)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p7
+
+        # Feistel substitution on right word (round 7)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p8
+        # Feistel substitution on left word (round 8)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p9
+
+        # Feistel substitution on right word (round 9)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p10
+        # Feistel substitution on left word (round 10)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p11
+
+        # Feistel substitution on right word (round 11)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p12
+        # Feistel substitution on left word (round 12)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p13
+
+        # Feistel substitution on right word (round 13)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p14
+        # Feistel substitution on left word (round 14)
+        r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+              S3[l & 0xff]) & 0xffffffff) ^ p15
+
+        # Feistel substitution on right word (round 15)
+        l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+              S3[r & 0xff]) & 0xffffffff) ^ p16
+        p16, p17 = l, r = r ^ p17, l
+
+
+        #------------------------------------------------
+        # save changes to original P array
+        #------------------------------------------------
+        P[:] = (p0, p1, p2, p3, p4, p5, p6, p7, p8, p9,
+          p10, p11, p12, p13, p14, p15, p16, p17)
+
+        #=============================================================
+        # update S
+        #=============================================================
+
+        for box in S:
+            j = 0
+            while j < 256:
+                l ^= p0
+
+                # Feistel substitution on left word (round 0)
+                r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                      S3[l & 0xff]) & 0xffffffff) ^ p1
+
+                # Feistel substitution on right word (round 1)
+                l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+                      S3[r & 0xff]) & 0xffffffff) ^ p2
+                # Feistel substitution on left word (round 2)
+                r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                      S3[l & 0xff]) & 0xffffffff) ^ p3
+
+                # Feistel substitution on right word (round 3)
+                l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+                      S3[r & 0xff]) & 0xffffffff) ^ p4
+                # Feistel substitution on left word (round 4)
+                r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                      S3[l & 0xff]) & 0xffffffff) ^ p5
+
+                # Feistel substitution on right word (round 5)
+                l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+                      S3[r & 0xff]) & 0xffffffff) ^ p6
+                # Feistel substitution on left word (round 6)
+                r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                      S3[l & 0xff]) & 0xffffffff) ^ p7
+
+                # Feistel substitution on right word (round 7)
+                l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+                      S3[r & 0xff]) & 0xffffffff) ^ p8
+                # Feistel substitution on left word (round 8)
+                r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                      S3[l & 0xff]) & 0xffffffff) ^ p9
+
+                # Feistel substitution on right word (round 9)
+                l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+                      S3[r & 0xff]) & 0xffffffff) ^ p10
+                # Feistel substitution on left word (round 10)
+                r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                      S3[l & 0xff]) & 0xffffffff) ^ p11
+
+                # Feistel substitution on right word (round 11)
+                l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+                      S3[r & 0xff]) & 0xffffffff) ^ p12
+                # Feistel substitution on left word (round 12)
+                r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                      S3[l & 0xff]) & 0xffffffff) ^ p13
+
+                # Feistel substitution on right word (round 13)
+                l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+                      S3[r & 0xff]) & 0xffffffff) ^ p14
+                # Feistel substitution on left word (round 14)
+                r ^= ((((S0[l >> 24] + S1[(l >> 16) & 0xff]) ^ S2[(l >> 8) & 0xff]) +
+                      S3[l & 0xff]) & 0xffffffff) ^ p15
+
+                # Feistel substitution on right word (round 15)
+                l ^= ((((S0[r >> 24] + S1[(r >> 16) & 0xff]) ^ S2[(r >> 8) & 0xff]) +
+                      S3[r & 0xff]) & 0xffffffff) ^ p16
+
+                box[j], box[j+1] = l, r = r ^ p17, l
+                j += 2
+    #===================================================================
+    # eoc
+    #===================================================================
+
+#=============================================================================
+# eof
+#=============================================================================