/usr/lib/python2.7/dist-packages/passlib/crypto/_blowfish/_gen_files.py is in python-passlib 1.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 | """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
#=============================================================================
|