def __init__(self, p, q, g, y):
self.p = p
self.q = q
self.g = g
self.y = y
params = DSAParameterNumbers(p, q, g)
self._key = DSAPublicNumbers(y, params).public_key(default_backend())
def _process_ssh_dss(self, data):
"""Parses ssh-dsa public keys."""
data_fields = {}
current_position = 0
for item in ("p", "q", "g", "y"):
current_position, value = self._unpack_by_int(data, current_position)
data_fields[item] = self._parse_long(value)
q_bits = self._bits_in_number(data_fields["q"])
p_bits = self._bits_in_number(data_fields["p"])
if q_bits != self.DSA_N_LENGTH:
raise InvalidKeyError("Incorrect DSA key parameters: bits(p)=%s, q=%s" % (self.bits, q_bits))
if self.strict_mode:
min_length = self.DSA_MIN_LENGTH_STRICT
max_length = self.DSA_MAX_LENGTH_STRICT
else:
min_length = self.DSA_MIN_LENGTH_LOOSE
max_length = self.DSA_MAX_LENGTH_LOOSE
if p_bits < min_length:
raise TooShortKeyError("%s key can not be shorter than %s bits (was %s)" % (self.key_type, min_length, p_bits))
if p_bits > max_length:
raise TooLongKeyError("%s key data can not be longer than %s bits (was %s)" % (self.key_type, max_length, p_bits))
dsa_parameters = DSAParameterNumbers(data_fields["p"], data_fields["q"], data_fields["g"])
self.dsa = DSAPublicNumbers(data_fields["y"], dsa_parameters).public_key(default_backend())
self.bits = self.dsa.key_size
return current_position
def __init__(self, p, q, g, y):
self.p = p
self.q = q
self.g = g
self.y = y
params = DSAParameterNumbers(p, q, g)
self._key = DSAPublicNumbers(y, params).public_key(default_backend())
def _load_ssh_dss_public_key(decoded_data, backend):
key_type, rest = _read_next_string(decoded_data)
p, rest = _read_next_mpint(rest)
q, rest = _read_next_mpint(rest)
g, rest = _read_next_mpint(rest)
y, rest = _read_next_mpint(rest)
if key_type != b'ssh-dss':
raise ValueError(
'Key header and key body contain different key type values.')
if rest:
raise ValueError('Key body contains extra bytes.')
parameter_numbers = DSAParameterNumbers(p, q, g)
public_numbers = DSAPublicNumbers(y, parameter_numbers)
return public_numbers.public_key(backend)
def _load_ssh_dss_public_key(decoded_data, backend):
key_type, rest = _read_next_string(decoded_data)
p, rest = _read_next_mpint(rest)
q, rest = _read_next_mpint(rest)
g, rest = _read_next_mpint(rest)
y, rest = _read_next_mpint(rest)
if key_type != b'ssh-dss':
raise ValueError(
'Key header and key body contain different key type values.')
if rest:
raise ValueError('Key body contains extra bytes.')
parameter_numbers = DSAParameterNumbers(p, q, g)
public_numbers = DSAPublicNumbers(y, parameter_numbers)
return public_numbers.public_key(backend)
def __init__(self, p, q, g, y, x):
self.p = p
self.q = q
self.g = g
self.y = y
self.x = x
params = DSAParameterNumbers(p, q, g)
pub = DSAPublicNumbers(y, params)
self._key = DSAPrivateNumbers(x, pub).private_key(default_backend())
def test_load_ssh_public_key_dss(self, backend):
ssh_key = (
b"ssh-dss AAAAB3NzaC1kc3MAAACBALmwUtfwdjAUjU2Dixd5DvT0NDcjjr69UD"
b"LqSD/Xt5Al7D3GXr1WOrWGpjO0NE9qzRCvMTU7zykRH6XjuNXB6Hvv48Zfm4vm"
b"nHQHFmmMg2bI75JbnOwdzWnnPZJrVU4rS23dFFPqs5ug+EbhVVrcwzxahjcSjJ"
b"7WEQSkVQWnSPbbAAAAFQDXmpD3DIkGvLSBf1GdUF4PHKtUrQAAAIB/bJFwss+2"
b"fngmfG/Li5OyL7A9iVoGdkUaFaxEUROTp7wkm2z49fXFAir+/U31v50Tu98YLf"
b"WvKlxdHcdgQYV9Ww5LIrhWwwD4UKOwC6w5S3KHVbi3pWUi7vxJFXOWfeu1mC/J"
b"TWqMKR91j+rmOtdppWIZRyIVIqLcMdGO3m+2VgAAAIANFDz5KQH5NvoljpoRQi"
b"RgyPjxWXiE7vjLElKj4v8KrpanAywBzdhIW1y/tzpGuwRwj5ihi8iNTHgSsoTa"
b"j5AG5HPomJf5vJElxpu/2O9pHA52wcNObIQ7j+JA5uWusxNIbl+pF6sSiP8abr"
b"z53N7tPF/IhHTjBHb1Ol7IFu9p9A== testkey@localhost")
key = load_ssh_public_key(ssh_key, backend)
assert key is not None
assert isinstance(key, interfaces.DSAPublicKey)
numbers = key.public_numbers()
expected_y = int(
"d143cf92901f936fa258e9a11422460c8f8f1597884eef8cb1252a3e2ff0aae"
"96a7032c01cdd8485b5cbfb73a46bb04708f98a18bc88d4c7812b284da8f900"
"6e473e89897f9bc9125c69bbfd8ef691c0e76c1c34e6c843b8fe240e6e5aeb3"
"13486e5fa917ab1288ff1a6ebcf9dcdeed3c5fc88474e30476f53a5ec816ef6"
"9f4", 16)
expected_p = int(
"b9b052d7f07630148d4d838b17790ef4f43437238ebebd5032ea483fd7b7902"
"5ec3dc65ebd563ab586a633b4344f6acd10af31353bcf29111fa5e3b8d5c1e8"
"7befe3c65f9b8be69c740716698c8366c8ef925b9cec1dcd69e73d926b554e2"
"b4b6ddd1453eab39ba0f846e1555adcc33c5a8637128c9ed61104a45505a748"
"f6db", 16)
expected_q = 1230879958723280233885494314531920096931919647917
expected_g = int(
"7f6c9170b2cfb67e78267c6fcb8b93b22fb03d895a0676451a15ac44511393a"
"7bc249b6cf8f5f5c5022afefd4df5bf9d13bbdf182df5af2a5c5d1dc7604185"
"7d5b0e4b22b856c300f850a3b00bac394b728755b8b7a56522eefc491573967"
"debb5982fc94d6a8c291f758feae63ad769a5621947221522a2dc31d18ede6f"
"b656", 16)
expected = DSAPublicNumbers(
expected_y, DSAParameterNumbers(expected_p, expected_q,
expected_g))
assert numbers == expected
class DSAPublicKey:
def __init__(self, p, q, g, y):
self.p = p
self.q = q
self.g = g
self.y = y
params = DSAParameterNumbers(p, q, g)
self._key = DSAPublicNumbers(y, params).public_key(default_backend())
def verify(self, data, sig):
verifier = self._key.verifier(der_encode(sig), SHA1())
verifier.update(data)
try:
verifier.verify()
return True
except InvalidSignature:
return False
class DSAPublicKey:
def __init__(self, p, q, g, y):
self.p = p
self.q = q
self.g = g
self.y = y
params = DSAParameterNumbers(p, q, g)
self._key = DSAPublicNumbers(y, params).public_key(default_backend())
def verify(self, data, sig):
verifier = self._key.verifier(der_encode(sig), SHA1())
verifier.update(data)
try:
verifier.verify()
return True
except InvalidSignature:
return False
DSA_KEY_1024 = DSAPrivateNumbers(
public_numbers=DSAPublicNumbers(
parameter_numbers=DSAParameterNumbers(
p=int(
"d38311e2cd388c3ed698e82fdf88eb92b5a9a483dc88005d4b725ef34"
"1eabb47cf8a7a8a41e792a156b7ce97206c4f9c5ce6fc5ae7912102b6"
"b502e59050b5b21ce263dddb2044b652236f4d42ab4b5d6aa73189cef"
"1ace778d7845a5c1c1c7147123188f8dc551054ee162b634d60f097f7"
"19076640e20980a0093113a8bd73",
16,
),
q=int("96c5390a8b612c0e422bb2b0ea194a3ec935a281", 16),
g=int(
"06b7861abbd35cc89e79c52f68d20875389b127361ca66822138ce499"
"1d2b862259d6b4548a6495b195aa0e0b6137ca37eb23b94074d3c3d30"
"0042bdf15762812b6333ef7b07ceba78607610fcc9ee68491dbc1e34c"
"d12615474e52b18bc934fb00c61d39e7da8902291c4434a4e2224c3f4"
"fd9f93cd6f4f17fc076341a7e7d9",
16,
),
),
y=int(
"6f26d98d41de7d871b6381851c9d91fa03942092ab6097e76422070edb71d"
"b44ff568280fdb1709f8fc3feab39f1f824adaeb2a298088156ac31af1aa0"
"4bf54f475bdcfdcf2f8a2dd973e922d83e76f016558617603129b21c70bf7"
"d0e5dc9e68fe332e295b65876eb9a12fe6fca9f1a1ce80204646bf99b5771"
"d249a6fea627",
16,
),
),
x=int("8185fee9cc7c0e91fd85503274f1cd5a3fd15a49", 16),
