def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
python类SHA1的实例源码
def __init__(self, key, length, algorithm, backend,
enforce_key_length=True):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16 and enforce_key_length is True:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def create_decryptor(private_location, public_location):
try:
with open(private_location, "rb") as key_file:
private_key = serialization.load_pem_private_key(
key_file.read(),
password=None,
backend=default_backend()
)
except FileNotFoundError:
with open(private_location, "wb") as key_file:
private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=2048,
backend=default_backend()
)
key_file.write(private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.TraditionalOpenSSL,
encryption_algorithm=serialization.NoEncryption()
))
with open(public_location, "wb") as public_file:
public_key = private_key.public_key()
pem = public_key.public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo
)
public_file.write(pem)
def decrypt(ciphertext):
return private_key.decrypt(
ciphertext,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
algorithm=hashes.SHA1(),
label=None
)
)
return decrypt
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def show_Certificate(cert, short=False):
"""
Print Fingerprints, Issuer and Subject of an X509 Certificate.
:param cert: X509 Certificate to print
:param short: Print in shortform for DN (Default: False)
:type cert: :class:`cryptography.x509.Certificate`
:type short: Boolean
"""
for h in [hashes.MD5, hashes.SHA1, hashes.SHA256, hashes.SHA512]:
print("{}: {}".format(h.name, binascii.hexlify(cert.fingerprint(h())).decode("ascii")))
print("Issuer: {}".format(get_Name(cert.issuer, short=short)))
print("Subject: {}".format(get_Name(cert.subject, short=short)))
################################## AXML FORMAT ########################################
# Translated from
# http://code.google.com/p/android4me/source/browse/src/android/content/res/AXmlResourceParser.java
def verify_ssh_sig(self, data, msg):
if msg.get_text() != 'ssh-rsa':
return False
key = self.key
if isinstance(key, rsa.RSAPrivateKey):
key = key.public_key()
verifier = key.verifier(
signature=msg.get_binary(),
padding=padding.PKCS1v15(),
algorithm=hashes.SHA1(),
)
verifier.update(data)
try:
verifier.verify()
except InvalidSignature:
return False
else:
return True
def verify_ssh_sig(self, data, msg):
if msg.get_text() != 'ssh-rsa':
return False
key = self.key
if isinstance(key, rsa.RSAPrivateKey):
key = key.public_key()
verifier = key.verifier(
signature=msg.get_binary(),
padding=padding.PKCS1v15(),
algorithm=hashes.SHA1(),
)
verifier.update(data)
try:
verifier.verify()
except InvalidSignature:
return False
else:
return True
def __init__(self, key, length, algorithm, backend,
enforce_key_length=True):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16 and enforce_key_length is True:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def verify_ssh_sig(self, data, msg):
if msg.get_text() != 'ssh-rsa':
return False
key = self.key
if isinstance(key, rsa.RSAPrivateKey):
key = key.public_key()
verifier = key.verifier(
signature=msg.get_binary(),
padding=padding.PKCS1v15(),
algorithm=hashes.SHA1(),
)
verifier.update(data)
try:
verifier.verify()
except InvalidSignature:
return False
else:
return True
def __init__(self, key, length, algorithm, backend):
if not isinstance(backend, HMACBackend):
raise UnsupportedAlgorithm(
"Backend object does not implement HMACBackend.",
_Reasons.BACKEND_MISSING_INTERFACE
)
if len(key) < 16:
raise ValueError("Key length has to be at least 128 bits.")
if not isinstance(length, six.integer_types):
raise TypeError("Length parameter must be an integer type.")
if length < 6 or length > 8:
raise ValueError("Length of HOTP has to be between 6 to 8.")
if not isinstance(algorithm, (SHA1, SHA256, SHA512)):
raise TypeError("Algorithm must be SHA1, SHA256 or SHA512.")
self._key = key
self._length = length
self._algorithm = algorithm
self._backend = backend
def __init__(self, pem_private_key, private_key_password=None):
"""
RSA Certificate Authority used to sign certificates.
:param pem_private_key: PEM formatted RSA Private Key. It should be encrypted with a
password, but that is not required.
:param private_key_password: Password to decrypt the PEM RSA Private Key, if it is
encrypted. Which it should be.
"""
super(SSHCertificateAuthority, self).__init__()
self.public_key_type = SSHPublicKeyType.RSA
self.private_key = load_pem_private_key(pem_private_key,
private_key_password,
default_backend())
self.signer = self.private_key.signer(padding.PKCS1v15(),
hashes.SHA1())
ca_pub_numbers = self.private_key.public_key().public_numbers()
self.e = ca_pub_numbers.e
self.n = ca_pub_numbers.n
def verify_ssh_sig(self, data, msg):
if msg.get_text() != 'ssh-rsa':
return False
key = self.key
if isinstance(key, rsa.RSAPrivateKey):
key = key.public_key()
verifier = key.verifier(
signature=msg.get_binary(),
padding=padding.PKCS1v15(),
algorithm=hashes.SHA1(),
)
verifier.update(data)
try:
verifier.verify()
except InvalidSignature:
return False
else:
return True
def _enc_dec_rsa(backend, key, data, padding):
if not isinstance(padding, AsymmetricPadding):
raise TypeError("Padding must be an instance of AsymmetricPadding.")
if isinstance(padding, PKCS1v15):
padding_enum = backend._lib.RSA_PKCS1_PADDING
elif isinstance(padding, OAEP):
padding_enum = backend._lib.RSA_PKCS1_OAEP_PADDING
if not isinstance(padding._mgf, MGF1):
raise UnsupportedAlgorithm(
"Only MGF1 is supported by this backend.",
_Reasons.UNSUPPORTED_MGF
)
if not isinstance(padding._mgf._algorithm, hashes.SHA1):
raise UnsupportedAlgorithm(
"This backend supports only SHA1 inside MGF1 when "
"using OAEP.",
_Reasons.UNSUPPORTED_HASH
)
if padding._label is not None and padding._label != b"":
raise ValueError("This backend does not support OAEP labels.")
if not isinstance(padding._algorithm, hashes.SHA1):
raise UnsupportedAlgorithm(
"This backend only supports SHA1 when using OAEP.",
_Reasons.UNSUPPORTED_HASH
)
else:
raise UnsupportedAlgorithm(
"{0} is not supported by this backend.".format(
padding.name
),
_Reasons.UNSUPPORTED_PADDING
)
if backend._lib.Cryptography_HAS_PKEY_CTX:
return _enc_dec_rsa_pkey_ctx(backend, key, data, padding_enum)
else:
return _enc_dec_rsa_098(backend, key, data, padding_enum)
def pbkdf2_hmac_supported(self, algorithm):
if self._lib.Cryptography_HAS_PBKDF2_HMAC:
return self.hmac_supported(algorithm)
else:
# OpenSSL < 1.0.0 has an explicit PBKDF2-HMAC-SHA1 function,
# so if the PBKDF2_HMAC function is missing we only support
# SHA1 via PBKDF2_HMAC_SHA1.
return isinstance(algorithm, hashes.SHA1)
def derive_pbkdf2_hmac(self, algorithm, length, salt, iterations,
key_material):
buf = self._ffi.new("char[]", length)
if self._lib.Cryptography_HAS_PBKDF2_HMAC:
evp_md = self._lib.EVP_get_digestbyname(
algorithm.name.encode("ascii"))
self.openssl_assert(evp_md != self._ffi.NULL)
res = self._lib.PKCS5_PBKDF2_HMAC(
key_material,
len(key_material),
salt,
len(salt),
iterations,
evp_md,
length,
buf
)
self.openssl_assert(res == 1)
else:
if not isinstance(algorithm, hashes.SHA1):
raise UnsupportedAlgorithm(
"This version of OpenSSL only supports PBKDF2HMAC with "
"SHA1.",
_Reasons.UNSUPPORTED_HASH
)
res = self._lib.PKCS5_PBKDF2_HMAC_SHA1(
key_material,
len(key_material),
salt,
len(salt),
iterations,
length,
buf
)
self.openssl_assert(res == 1)
return self._ffi.buffer(buf)[:]
def rsa_padding_supported(self, padding):
if isinstance(padding, PKCS1v15):
return True
elif isinstance(padding, PSS) and isinstance(padding._mgf, MGF1):
return self._mgf1_hash_supported(padding._mgf._algorithm)
elif isinstance(padding, OAEP) and isinstance(padding._mgf, MGF1):
return isinstance(padding._mgf._algorithm, hashes.SHA1)
else:
return False
def dsa_hash_supported(self, algorithm):
if self._lib.OPENSSL_VERSION_NUMBER < 0x1000000f:
return isinstance(algorithm, hashes.SHA1)
else:
return self.hash_supported(algorithm)
def _enc_dec_rsa(backend, key, data, padding):
if not isinstance(padding, AsymmetricPadding):
raise TypeError("Padding must be an instance of AsymmetricPadding.")
if isinstance(padding, PKCS1v15):
padding_enum = backend._lib.RSA_PKCS1_PADDING
elif isinstance(padding, OAEP):
padding_enum = backend._lib.RSA_PKCS1_OAEP_PADDING
if not isinstance(padding._mgf, MGF1):
raise UnsupportedAlgorithm(
"Only MGF1 is supported by this backend.",
_Reasons.UNSUPPORTED_MGF
)
if not isinstance(padding._mgf._algorithm, hashes.SHA1):
raise UnsupportedAlgorithm(
"This backend supports only SHA1 inside MGF1 when "
"using OAEP.",
_Reasons.UNSUPPORTED_HASH
)
if padding._label is not None and padding._label != b"":
raise ValueError("This backend does not support OAEP labels.")
if not isinstance(padding._algorithm, hashes.SHA1):
raise UnsupportedAlgorithm(
"This backend only supports SHA1 when using OAEP.",
_Reasons.UNSUPPORTED_HASH
)
else:
raise UnsupportedAlgorithm(
"{0} is not supported by this backend.".format(
padding.name
),
_Reasons.UNSUPPORTED_PADDING
)
if backend._lib.Cryptography_HAS_PKEY_CTX:
return _enc_dec_rsa_pkey_ctx(backend, key, data, padding_enum)
else:
return _enc_dec_rsa_098(backend, key, data, padding_enum)
def pbkdf2_hmac_supported(self, algorithm):
if self._lib.Cryptography_HAS_PBKDF2_HMAC:
return self.hmac_supported(algorithm)
else:
# OpenSSL < 1.0.0 has an explicit PBKDF2-HMAC-SHA1 function,
# so if the PBKDF2_HMAC function is missing we only support
# SHA1 via PBKDF2_HMAC_SHA1.
return isinstance(algorithm, hashes.SHA1)
def derive_pbkdf2_hmac(self, algorithm, length, salt, iterations,
key_material):
buf = self._ffi.new("char[]", length)
if self._lib.Cryptography_HAS_PBKDF2_HMAC:
evp_md = self._lib.EVP_get_digestbyname(
algorithm.name.encode("ascii"))
self.openssl_assert(evp_md != self._ffi.NULL)
res = self._lib.PKCS5_PBKDF2_HMAC(
key_material,
len(key_material),
salt,
len(salt),
iterations,
evp_md,
length,
buf
)
self.openssl_assert(res == 1)
else:
if not isinstance(algorithm, hashes.SHA1):
raise UnsupportedAlgorithm(
"This version of OpenSSL only supports PBKDF2HMAC with "
"SHA1.",
_Reasons.UNSUPPORTED_HASH
)
res = self._lib.PKCS5_PBKDF2_HMAC_SHA1(
key_material,
len(key_material),
salt,
len(salt),
iterations,
length,
buf
)
self.openssl_assert(res == 1)
return self._ffi.buffer(buf)[:]
def _mgf1_hash_supported(self, algorithm):
if self._lib.Cryptography_HAS_MGF1_MD:
return self.hash_supported(algorithm)
else:
return isinstance(algorithm, hashes.SHA1)
def rsa_padding_supported(self, padding):
if isinstance(padding, PKCS1v15):
return True
elif isinstance(padding, PSS) and isinstance(padding._mgf, MGF1):
return self._mgf1_hash_supported(padding._mgf._algorithm)
elif isinstance(padding, OAEP) and isinstance(padding._mgf, MGF1):
return isinstance(padding._mgf._algorithm, hashes.SHA1)
else:
return False
def dsa_hash_supported(self, algorithm):
if self._lib.OPENSSL_VERSION_NUMBER < 0x1000000f:
return isinstance(algorithm, hashes.SHA1)
else:
return self.hash_supported(algorithm)
