def testRsa(self):
e = 17
n = 3233
d = 2753
m = 3000
s = crypto.rsaSign(m, d, n)
self.assertTrue(crypto.rsaVerify(s, m, e, n))
r = 11
bm = crypto.rsaBlind(m, r, e, n)
bs = crypto.rsaSign(bm, d, n)
s = crypto.rsaUnblind(r, n, bs)
self.assertTrue(crypto.rsaVerify(s, m, e, n))
def verifySignature(m, signature, publicKey):
"""
Verify a type 0 signature over m
@param m: binary message
@type m: string
@param signature: The OpenPGP signature over m.
@type signature: SignatureMessage
@param publicKey: The public key of the signer.
@type publicKey: PublicKeyMessage
@return: Returns true if the signature is valid.
"""
data = (m + signature.packets[TAG_SIGNATURE].hashdata())
plainhash = crypto.hash(
data,
signature.packets[TAG_SIGNATURE].hashAlgorithm.value)
if signature.packets[TAG_SIGNATURE].hashLeftTwo != plainhash[0:2]:
return False
codedhash = encoding.pkcs15(
plainhash,
publicKey.packets[TAG_PUBKEY].n.bits(),
signature.packets[TAG_SIGNATURE].hashAlgorithm.value)
codedhashInt = elements.ScalarElement(codedhash).value
rsaN = publicKey.packets[TAG_PUBKEY].n.value
rsaE = publicKey.packets[TAG_PUBKEY].e.value
return crypto.rsaVerify(signature.packets[TAG_SIGNATURE].sig.value,
codedhashInt, rsaE, rsaN)
def testForge(self):
e = 17
n = 3233
d = 2753
m1 = 11
m2 = 19
bm1 = crypto.rsaBlind(m1, 11, e, n)
bs1 = pow(bm1, d, n)
s1 = crypto.rsaUnblind(11, n, bs1)
self.assertTrue(crypto.rsaVerify(s1, m1, e, n))
bm2 = crypto.rsaBlind(m2, 13, e, n)
bs2 = pow(bm2, d, n)
s2 = crypto.rsaUnblind(13, n, bs2)
self.assertTrue(crypto.rsaVerify(s2, m2, e, n))
self.assertTrue(crypto.rsaVerify((s1 * s2) % n, (m1 * m2) % n, e, n))
self.assertTrue(crypto.rsaVerify(crypto.modInverse(s1, n),
crypto.modInverse(m1, n), e, n))
def testSign(self):
message = 'The quick brown fox jumps over the lazy dog\n'
packet = packets.BlindMessagePacket()
packet.m = elements.MPIElement(elements.ScalarElement(message).value)
blindMessage = messages.BlindMessageMessage()
blindMessage.packets[packet.TAG] = packet
sigMessage = self.ca.sign(blindMessage)
self.assertTrue(crypto.rsaVerify(
sigMessage.packets[TAG_BLINDSIG].s.value,
packet.m.value,
self.ca.secretKey.packets[TAG_SECKEY].e.value,
self.ca.secretKey.packets[TAG_SECKEY].n.value))