aboutsummaryrefslogtreecommitdiff
path: root/tests/test-rsa.py
blob: 8f3f8b526a2446c612ede0c306d24bdd164cdd27 (plain) (blame)
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
#!/usr/bin/env python

"""
Use PyCrypto to generate test data for Cryptech ModExp core.
"""

# Author: Rob Austein
# Copyright (c) 2015, SUNET
#
# 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 OWNER 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 argparse                           import ArgumentParser, FileType
from Crypto                             import __version__ as PyCryptoVersion
from Crypto.PublicKey                   import RSA
from Crypto.Hash                        import SHA256
from Crypto.Util.number                 import long_to_bytes, inverse
from Crypto.Signature.PKCS1_v1_5        import EMSA_PKCS1_V1_5_ENCODE, PKCS115_SigScheme
from textwrap                           import TextWrapper
import sys, os.path

def KeyLengthType(arg):
  val = int(arg)
  if val % 8 != 0:
    raise ValueError
  return val

parser = ArgumentParser(description = __doc__)
parser.add_argument("--pad-to-modulus", action = "store_true",
                    help = "zero-pad to modulus size (bug workaround)")
parser.add_argument("--extra-word", action = "store_true",
                    help = "add extra word of zero padding (bug workaround)")
parser.add_argument("-k", "--key-lengths", type = KeyLengthType,
                    nargs = "*", default = [1024, 2048, 4096],
                    help = "Lengths in bits of keys to generate")
parser.add_argument("--pkcs-encoding", type = int, choices = (1, 8), default = 8,
                    help = "PKCS encoding to use for PEM commented private key")
parser.add_argument("output", nargs = "?", type = FileType("w"), default = sys.stdout,
                    help = "output file")
args = parser.parse_args()

plaintext = "You can hack anything you want with TECO and DDT."

scriptname = os.path.basename(sys.argv[0])

wrapper = TextWrapper(width = 78, initial_indent = " " * 2, subsequent_indent = " " * 2)

def printlines(*lines, **kwargs):
  for line in lines:
    args.output.write(line % kwargs + "\n")

def trailing_comma(item, sequence):
  return "" if item == sequence[-1] else ","

def print_hex(name, value, comment):
  printlines("static const uint8_t %(name)s[] = { /* %(comment)s, %(length)d bytes */",
             wrapper.fill(", ".join("0x%02x" % ord(v) for v in value)),
             "};", "",
             name = name, comment = comment, length  = len(value))

def pad_to_blocksize(value, blocksize):
  extra = len(value) % blocksize
  return value if extra == 0 else ("\x00" * (blocksize - extra)) + value

# Funnily enough, PyCrypto and Cryptlib use exactly the same names for
# RSA key components, see Cryptlib documentation pages 186-187 & 339.

h = SHA256.new(plaintext)

printlines("/*",
           " * RSA signature test data for Cryptech project, automatically generated by",
           " * %(scriptname)s using PyCrypto version %(version)s. Do not edit.",
           " *",
           " * Plaintext: \"%(plaintext)s\"",
           " * SHA-256: %(digest)s",
           " */", "",
           scriptname = scriptname,
           version    = PyCryptoVersion,
           plaintext  = plaintext,
           digest     = h.hexdigest())

fields = ("n", "e", "d", "p", "q", "dP", "dQ", "u", "m", "s")

for k_len in args.key_lengths:

  k = RSA.generate(k_len)       # Cryptlib insists u < p, probably with good reason,
  while k.u >= k.p:             # and I'm sure not going to argue the math with Peter,
    k = RSA.generate(k_len)     # so keep trying until we pass this test

  m = EMSA_PKCS1_V1_5_ENCODE(h, k_len/8)
  s = PKCS115_SigScheme(k).sign(h)
  assert len(m) == len(s)

  if args.pad_to_modulus:
    blocksize = k_len/8
    if args.extra_word:
      blocksize += 4
  else:
    blocksize = 4

  printlines("/* %(k_len)d-bit RSA private key (PKCS #%(pkcs)d)",
             k.exportKey(format = "PEM", pkcs = args.pkcs_encoding),
             "*/", "",
             k_len = k_len, pkcs  = args.pkcs_encoding)

  # PyCrypto doesn't precalculate dP or dQ, and for some reason it
  # does u backwards (uses (1/p % q) and swaps the roles of p and q in
  # the CRT calculation to compensate), so we just calculate our own.

  for name in fields:
    if name in "ms":
      continue
    elif name == "dP":
      value = k.d % (k.p - 1)
    elif name == "dQ":
      value = k.d % (k.q - 1)
    elif name == "u":
      value = inverse(k.q, k.p)
    else:
      value = getattr(k, name)

    print_hex("%s_%d" % (name, k_len),
              long_to_bytes(value, blocksize = blocksize),
              "key component %s" % name)

  print_hex("m_%d" % k_len, pad_to_blocksize(m, blocksize), "message to be signed")
  print_hex("s_%d" % k_len, pad_to_blocksize(s, blocksize), "signed message")

printlines("typedef struct { const uint8_t *val; size_t len; } rsa_tc_bn_t;",
           "typedef struct { size_t size; rsa_tc_bn_t %(fields)s; } rsa_tc_t;",
           "",
           "static const rsa_tc_t rsa_tc[] = {",
           fields = ", ".join(fields))
for k_len in args.key_lengths:
  printlines("  { %(k_len)d,", k_len = k_len)
  for field in fields:
    printlines("    { %(field)s_%(k_len)d, sizeof(%(field)s_%(k_len)d) }%(comma)s",
               field = field, k_len = k_len, comma = trailing_comma(field, fields))
  printlines("  }%(comma)s", comma = trailing_comma(k_len, args.key_lengths))
printlines("};")