def generate(self, status):
"""Create a CertificateVerify message"""
if self.msg_version is None:
self.msg_version = status.version
if self.sig_version is None:
self.sig_version = self.msg_version
if self.msg_alg is None and self.msg_version >= (3, 3):
cert_req = next((msg for msg in status.handshake_messages[::-1]
if isinstance(msg, CertificateRequest)), None)
if cert_req is not None:
self.msg_alg = next(
(sig for sig in cert_req.supported_signature_algs
if sig[1] == SignatureAlgorithm.rsa), None)
if self.msg_alg is None:
self.msg_alg = (HashAlgorithm.sha1, SignatureAlgorithm.rsa)
if self.sig_alg is None:
self.sig_alg = self.msg_alg
# TODO: generate a random key if none provided
if self.private_key is None:
raise ValueError("Can't create a signature without private key!")
verify_bytes = KeyExchange.calcVerifyBytes(self.sig_version,
status.handshake_hashes,
self.sig_alg,
status.premaster_secret,
status.client_random,
status.server_random)
signature = self.private_key.sign(verify_bytes)
cert_verify = CertificateVerify(self.msg_version)
cert_verify.create(signature, self.msg_alg)
self.msg = cert_verify
return cert_verify
def generate(self, status):
"""Create a CertificateVerify message"""
if self.version is None:
self.version = status.version
if self.sig_type is None and self.version >= (3, 3):
cert_req = next((msg for msg in status.handshake_messages[::-1]
if isinstance(msg, CertificateRequest)), None)
if cert_req is not None:
self.sig_type = next((sig for sig in
cert_req.supported_signature_algs
if sig[1] == SignatureAlgorithm.rsa),
None)
if self.sig_type is None:
self.sig_type = (HashAlgorithm.sha1,
SignatureAlgorithm.rsa)
# TODO: generate a random key if none provided
if self.private_key is None:
raise ValueError("Can't create a signature without private key!")
verify_bytes = KeyExchange.calcVerifyBytes(status.version,
status.handshake_hashes,
self.sig_type,
status.premaster_secret,
status.client_random,
status.server_random)
signature = self.private_key.sign(verify_bytes)
cert_verify = CertificateVerify(status.version)
cert_verify.create(signature, self.sig_type)
self.msg = cert_verify
return cert_verify
def test_with_TLS1_1(self):
vrfy = KeyExchange.calcVerifyBytes((3, 2),
self.handshake_hashes,
None, None, None, None)
self.assertEqual(vrfy, bytearray(
# MD5 hash
b'\xe9\x9f\xb4\xd24\xe9\xf41S\xe6?\xa5\xfe\xad\x16\x14'
# SHA1 hash
b'L3\x81\xad\x1b\xc2\x14\xc0\x8e\xba\xe4\xb8\xa2\x9d(6V1\xfb\xb0'
))
def test_with_TLS1_1(self):
vrfy = KeyExchange.calcVerifyBytes((3, 2),
self.handshake_hashes,
None, None, None, None)
self.assertEqual(vrfy, bytearray(
# MD5 hash
b'\xe9\x9f\xb4\xd24\xe9\xf41S\xe6?\xa5\xfe\xad\x16\x14'
# SHA1 hash
b'L3\x81\xad\x1b\xc2\x14\xc0\x8e\xba\xe4\xb8\xa2\x9d(6V1\xfb\xb0'
))
def test_with_SSL3(self):
vrfy = KeyExchange.calcVerifyBytes((3, 0),
self.handshake_hashes,
None,
bytearray(b'\x04'*48),
bytearray(b'\xaa'*32),
bytearray(b'\xbb'*32))
self.assertEqual(vrfy, bytearray(
b'r_\x06\xd2(\\}v\x87\xfc\xf5\xa2h\xd6S\xd8'
b'\xed=\x9b\xe3\xd9_%qe\xa3k\xf5\x85\x0e?\x9fr\xfaML'
))
def test_with_SSL3(self):
vrfy = KeyExchange.calcVerifyBytes((3, 0),
self.handshake_hashes,
None,
bytearray(b'\x04'*48),
bytearray(b'\xaa'*32),
bytearray(b'\xbb'*32))
self.assertEqual(vrfy, bytearray(
b'r_\x06\xd2(\\}v\x87\xfc\xf5\xa2h\xd6S\xd8'
b'\xed=\x9b\xe3\xd9_%qe\xa3k\xf5\x85\x0e?\x9fr\xfaML'
))
def test_with_TLS1_2(self):
vrfy = KeyExchange.calcVerifyBytes((3, 3),
self.handshake_hashes,
(HashAlgorithm.sha1,
SignatureAlgorithm.rsa),
None,
None,
None)
self.assertEqual(vrfy, bytearray(
# PKCS#1 prefix
b'0!0\t\x06\x05+\x0e\x03\x02\x1a\x05\x00\x04\x14'
# SHA1 hash
b'L3\x81\xad\x1b\xc2\x14\xc0\x8e\xba\xe4\xb8\xa2\x9d(6V1\xfb\xb0'))
def test_with_TLS1_2(self):
vrfy = KeyExchange.calcVerifyBytes((3, 3),
self.handshake_hashes,
(HashAlgorithm.sha1,
SignatureAlgorithm.rsa),
None,
None,
None)
self.assertEqual(vrfy, bytearray(
# PKCS#1 prefix
b'0!0\t\x06\x05+\x0e\x03\x02\x1a\x05\x00\x04\x14'
# SHA1 hash
b'L3\x81\xad\x1b\xc2\x14\xc0\x8e\xba\xe4\xb8\xa2\x9d(6V1\xfb\xb0'))
def generate(self, status):
"""Create a CertificateVerify message."""
if self.msg_version is None:
self.msg_version = status.version
if self.sig_version is None:
self.sig_version = self.msg_version
if self.msg_alg is None and self.msg_version >= (3, 3):
cert_req = next((msg for msg in status.handshake_messages[::-1]
if isinstance(msg, CertificateRequest)), None)
if cert_req is not None:
self.msg_alg = next((sig for sig in
cert_req.supported_signature_algs
if sig[1] == SignatureAlgorithm.rsa or
sig[0] == 8 and sig[1] in (4, 5, 6)),
None)
if self.msg_alg is None:
self.msg_alg = (HashAlgorithm.sha1,
SignatureAlgorithm.rsa)
if self.sig_alg is None:
self.sig_alg = self.msg_alg
# TODO: generate a random key if none provided
if self.signature is not None:
signature = self.signature
else:
if self.private_key is None:
raise ValueError("Can't create a signature without "
"private key!")
verify_bytes = KeyExchange.calcVerifyBytes(self.sig_version,
status.handshake_hashes,
self.sig_alg,
status.premaster_secret,
status.client_random,
status.server_random)
# we don't have to handle non pkcs1 padding because the
# calcVerifyBytes does everything
scheme = SignatureScheme.toRepr(self.sig_alg)
hashName = None
saltLen = 0
if scheme is None:
padding = "pkcs1"
else:
padding = SignatureScheme.getPadding(scheme)
if padding == 'pss':
hashName = SignatureScheme.getHash(scheme)
if self.rsa_pss_salt_len is None:
self.rsa_pss_salt_len = \
getattr(hashlib, hashName)().digest_size
def _newRawPrivateKeyOp(self, m, original_rawPrivateKeyOp,
subs=None, xors=None):
signBytes = numberToByteArray(m, numBytes(self.n))
signBytes = substitute_and_xor(signBytes, subs, xors)
m = bytesToNumber(signBytes)
# RSA operations are defined only on numbers that are smaller
# than the modulus, so ensure the XORing or substitutions
# didn't break it (especially necessary for pycrypto as
# it raises exception in such case)
if m > self.n:
m %= self.n
return original_rawPrivateKeyOp(m)
oldPrivateKeyOp = self.private_key._rawPrivateKeyOp
self.private_key._rawPrivateKeyOp = \
partial(_newRawPrivateKeyOp,
self.private_key,
original_rawPrivateKeyOp=oldPrivateKeyOp,
subs=self.padding_subs,
xors=self.padding_xors)
try:
signature = self.private_key.sign(verify_bytes,
padding,
hashName,
self.rsa_pss_salt_len)
finally:
# make sure the changes are undone even if the signing fails
self.private_key._rawPrivateKeyOp = oldPrivateKeyOp
cert_verify = CertificateVerify(self.msg_version)
cert_verify.create(signature, self.msg_alg)
self.msg = cert_verify
return cert_verify
def generate(self, status):
"""Create a CertificateVerify message."""
if self.msg_version is None:
self.msg_version = status.version
if self.sig_version is None:
self.sig_version = self.msg_version
if self.msg_alg is None and self.msg_version >= (3, 3):
cert_req = next((msg for msg in status.handshake_messages[::-1]
if isinstance(msg, CertificateRequest)), None)
if cert_req is not None:
self.msg_alg = next(
(sig for sig in cert_req.supported_signature_algs
if sig[1] == SignatureAlgorithm.rsa
or sig[0] == 8 and sig[1] in (4, 5, 6)), None)
if self.msg_alg is None:
self.msg_alg = (HashAlgorithm.sha1, SignatureAlgorithm.rsa)
if self.sig_alg is None:
self.sig_alg = self.msg_alg
# we need a copy of the handshake hashes for use in Extended Master
# Secret calculation
status.certificate_verify_handshake_hashes = \
status.handshake_hashes.copy()
# TODO: generate a random key if none provided
if self.signature is not None:
signature = self.signature
else:
if self.private_key is None:
raise ValueError("Can't create a signature without "
"private key!")
verify_bytes = KeyExchange.calcVerifyBytes(self.sig_version,
status.handshake_hashes,
self.sig_alg,
status.premaster_secret,
status.client_random,
status.server_random)
# we don't have to handle non pkcs1 padding because the
# calcVerifyBytes does everything
scheme = SignatureScheme.toRepr(self.sig_alg)
hashName = None
saltLen = 0
if scheme is None:
padding = "pkcs1"
else:
padding = SignatureScheme.getPadding(scheme)
if padding == 'pss':
hashName = SignatureScheme.getHash(scheme)
if self.rsa_pss_salt_len is None:
self.rsa_pss_salt_len = \
getattr(hashlib, hashName)().digest_size
def _newRawPrivateKeyOp(self,
m,
original_rawPrivateKeyOp,
subs=None,
xors=None):
signBytes = numberToByteArray(m, numBytes(self.n))
signBytes = substitute_and_xor(signBytes, subs, xors)
m = bytesToNumber(signBytes)
return original_rawPrivateKeyOp(m)
oldPrivateKeyOp = self.private_key._rawPrivateKeyOp
self.private_key._rawPrivateKeyOp = \
partial(_newRawPrivateKeyOp,
self.private_key,
original_rawPrivateKeyOp=oldPrivateKeyOp,
subs=self.padding_subs,
xors=self.padding_xors)
signature = self.private_key.sign(verify_bytes, padding, hashName,
self.rsa_pss_salt_len)
self.private_key._rawPrivateKeyOp = oldPrivateKeyOp
cert_verify = CertificateVerify(self.msg_version)
cert_verify.create(signature, self.msg_alg)
self.msg = cert_verify
return cert_verify
