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# -*- coding: utf-8 -*-
#
# SelfTest/PublicKey/test_ElGamal.py: Self-test for the ElGamal primitive
#
# ===================================================================
# 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.
# ===================================================================
"""Self-test suite for Crypto.PublicKey.ElGamal"""
__revision__ = "$Id$"
import unittest
from Crypto.SelfTest.st_common import list_test_cases, a2b_hex, b2a_hex
from Crypto import Random
from Crypto.PublicKey import ElGamal
from Crypto.Util.number import *
from Crypto.Util.py3compat import *
class ElGamalTest(unittest.TestCase):
#
# Test vectors
#
# There seem to be no real ElGamal test vectors available in the
# public domain. The following test vectors have been generated
# with libgcrypt 1.5.0.
#
tvs=[
{
# 256 bits
'p' :'BA4CAEAAED8CBE952AFD2126C63EB3B345D65C2A0A73D2A3AD4138B6D09BD933',
'g' :'05',
'y' :'60D063600ECED7C7C55146020E7A31C4476E9793BEAED420FEC9E77604CAE4EF',
'x' :'1D391BA2EE3C37FE1BA175A69B2C73A11238AD77675932',
'k' :'F5893C5BAB4131264066F57AB3D8AD89E391A0B68A68A1',
'pt' :'48656C6C6F207468657265',
'ct1':'32BFD5F487966CEA9E9356715788C491EC515E4ED48B58F0F00971E93AAA5EC7',
'ct2':'7BE8FBFF317C93E82FCEF9BD515284BA506603FEA25D01C0CB874A31F315EE68'
},
{
# 512 bits
'p' :'F1B18AE9F7B4E08FDA9A04832F4E919D89462FD31BF12F92791A93519F75076D6CE3942689CDFF2F344CAFF0F82D01864F69F3AECF566C774CBACF728B81A227',
'g' :'07',
'y' :'688628C676E4F05D630E1BE39D0066178CA7AA83836B645DE5ADD359B4825A12B02EF4252E4E6FA9BEC1DB0BE90F6D7C8629CABB6E531F472B2664868156E20C',
'x' :'14E60B1BDFD33436C0DA8A22FDC14A2CCDBBED0627CE68',
'k' :'38DBF14E1F319BDA9BAB33EEEADCAF6B2EA5250577ACE7',
'pt' :'48656C6C6F207468657265',
'ct1':'290F8530C2CC312EC46178724F196F308AD4C523CEABB001FACB0506BFED676083FE0F27AC688B5C749AB3CB8A80CD6F7094DBA421FB19442F5A413E06A9772B',
'ct2':'1D69AAAD1DC50493FB1B8E8721D621D683F3BF1321BE21BC4A43E11B40C9D4D9C80DE3AAC2AB60D31782B16B61112E68220889D53C4C3136EE6F6CE61F8A23A0'
}
]
def test_generate_128(self):
self._test_random_key(128)
def test_generate_512(self):
self._test_random_key(512)
def test_encryption(self):
for tv in self.tvs:
for as_longs in (0,1):
d = self.convert_tv(tv, as_longs)
key = ElGamal.construct(d['key'])
ct = key.encrypt(d['pt'], d['k'])
self.assertEquals(ct[0], d['ct1'])
self.assertEquals(ct[1], d['ct2'])
def test_decryption(self):
for tv in self.tvs:
for as_longs in (0,1):
d = self.convert_tv(tv, as_longs)
key = ElGamal.construct(d['key'])
pt = key.decrypt((d['ct1'], d['ct2']))
self.assertEquals(pt, d['pt'])
def convert_tv(self, tv, as_longs=0):
"""Convert a test vector from textual form (hexadecimal ascii
to either integers or byte strings."""
comps = []
for c in 'p','g','y','x','k','pt','ct1','ct2':
comps += [ tv[c] ]
comps = map(a2b_hex, comps)
if as_longs:
comps = map(bytes_to_long, comps)
else:
comps = map(bytes_to_long, comps[:4]) + comps[4:]
ret = {}
ret['key'] = comps[:4]
i = 4
for v in 'k','pt','ct1','ct2':
ret[v] = comps[i]
i += 1
return ret
def _test_random_key(self, bits):
elgObj = ElGamal.generate(bits, Random.new().read)
self._check_private_key(elgObj)
self._exercise_primitive(elgObj)
pub = elgObj.publickey()
self._check_public_key(pub)
self._exercise_public_primitive(elgObj)
def _check_private_key(self, elgObj):
# Check capabilities
self.failUnless(elgObj.has_private())
self.failUnless(elgObj.can_sign())
self.failUnless(elgObj.can_encrypt())
# Sanity check key data
self.failUnless(1<elgObj.g<(elgObj.p-1))
self.assertEquals(pow(elgObj.g, elgObj.p-1, elgObj.p), 1)
self.failUnless(1<elgObj.x<(elgObj.p-1))
self.assertEquals(pow(elgObj.g, elgObj.x, elgObj.p), elgObj.y)
def _check_public_key(self, elgObj):
# Check capabilities
self.failIf(elgObj.has_private())
self.failUnless(elgObj.can_sign())
self.failUnless(elgObj.can_encrypt())
# Sanity check key data
self.failUnless(1<elgObj.g<(elgObj.p-1))
self.assertEquals(pow(elgObj.g, elgObj.p-1, elgObj.p), 1)
def _exercise_primitive(self, elgObj):
# Test encryption/decryption
plaintext = b("Test")
ciphertext = elgObj.encrypt(plaintext, 123456789L)
plaintextP = elgObj.decrypt(ciphertext)
self.assertEquals(plaintext, plaintextP)
# Test signature/verification
signature = elgObj.sign(plaintext, 987654321L)
elgObj.verify(plaintext, signature)
def _exercise_public_primitive(self, elgObj):
plaintext = b("Test")
ciphertext = elgObj.encrypt(plaintext, 123456789L)
def get_tests(config={}):
tests = []
tests += list_test_cases(ElGamalTest)
return tests
if __name__ == '__main__':
suite = lambda: unittest.TestSuite(get_tests())
unittest.main(defaultTest='suite')
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