python类Hash()的实例源码

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def rsa_key_fingerprint(key):
    """ Return the SHA256 fingerprint of an RSA public or private key in url safe BASE64 """
    fp = hashes.Hash(algorithm=hashes.SHA256(), backend=default_backend())

    if isinstance(key, rsa.RSAPrivateKey):
        fp.update(key.private_bytes(
            encoding=serialization.Encoding.DER,
            format=serialization.PrivateFormat.PKCS8,
            encryption_algorithm=serialization.NoEncryption()
        ))
    elif isinstance(key, rsa.RSAPublicKey):
        fp.update(key.public_bytes(
            encoding=serialization.Encoding.DER,
            format=serialization.PublicFormat.PKCS1
        ))

    return urlsafe_b64encode(fp.finalize()).decode()

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def generate_fingerprint(public_key):
    try:
        pub_bytes = public_key.encode('utf-8')
        # Test that the given public_key string is a proper ssh key. The
        # returned object is unused since pyca/cryptography does not have a
        # fingerprint method.
        serialization.load_ssh_public_key(
            pub_bytes, backends.default_backend())
        pub_data = base64.b64decode(public_key.split(' ')[1])
        digest = hashes.Hash(hashes.MD5(), backends.default_backend())
        digest.update(pub_data)
        md5hash = digest.finalize()
        raw_fp = binascii.hexlify(md5hash)
        if six.PY3:
            raw_fp = raw_fp.decode('ascii')
        return ':'.join(a + b for a, b in zip(raw_fp[::2], raw_fp[1::2]))
    except Exception:
        raise exception.InvalidKeypair(
            reason=_('failed to generate fingerprint'))

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def check(self):
        from cryptography.hazmat.backends import default_backend
        from cryptography.hazmat.primitives import hashes

        off = self.offset
        if self.copyMethod == 0 and (1 << 20) > self.size >= 0x800+0xA00 and self.address == 0x08006000:
            if self.sectionData[0x50 : 0x53] == b"K9L":
                self.guessedType = self.sectionData[0x50 : 0x54].decode("ascii")
            elif self.sectionData[0x50 : 0x54] == b"\xFF\xFF\xFF\xFF":
                self.guessedType = "K9L0"
        elif self.copyMethod == 0 and (1 << 20) > self.size >= 0xA00 and self.address == 0x08006800:
            self.guessedType = "Kernel9"
        elif self.copyMethod == 1 and self.size >= 0xA00:
            if self.sectionData[0x100 : 0x104] == b"NCCH":
                self.guessedType = "Kernel11 modules"

        H = hashes.Hash(hashes.SHA256(), backend=default_backend())
        H.update(self.sectionData)
        self.hashIsValid = self.hash == H.finalize()

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def derive(self, key_material):
        if self._used:
            raise AlreadyFinalized
        self._used = True

        if not isinstance(key_material, bytes):
            raise TypeError("key_material must be bytes.")

        output = [b""]
        outlen = 0
        counter = 1

        while self._length > outlen:
            h = hashes.Hash(self._algorithm, self._backend)
            h.update(key_material)
            h.update(_int_to_u32be(counter))
            if self._sharedinfo is not None:
                h.update(self._sharedinfo)
            output.append(h.finalize())
            outlen += len(output[-1])
            counter += 1

        return b"".join(output)[:self._length]

def test_ecc_static_length_signature(algorithm):
    private_key = ec.generate_private_key(
        curve=algorithm.signing_algorithm_info(),
        backend=default_backend()
    )
    hasher = hashes.Hash(
        algorithm.signing_hash_type(),
        backend=default_backend()
    )
    data = b'aifuhaw9fe48haw9e8cnavwp9e8fhaw9438fnhjzsudfvhnsa89w74fhp90se8rhgfi'
    hasher.update(data)
    digest = hasher.finalize()
    signature = _ecc_static_length_signature(
        key=private_key,
        algorithm=algorithm,
        digest=digest
    )
    assert len(signature) == algorithm.signature_len
    private_key.public_key().verify(
        signature=signature,
        data=data,
        signature_algorithm=ec.ECDSA(algorithm.signing_hash_type())
    )

def _encrypted_data_keys_hash(hasher, encrypted_data_keys):
    """Generates the expected hash for the provided encrypted data keys.

    :param hasher: Existing hasher to use
    :type hasher: cryptography.hazmat.primitives.hashes.Hash
    :param iterable encrypted_data_keys: Encrypted data keys to hash
    :returns: Concatenated, sorted, list of all hashes
    :rtype: bytes
    """
    hashed_keys = []
    for edk in encrypted_data_keys:
        serialized_edk = serialize_encrypted_data_key(edk)
        _hasher = hasher.copy()
        _hasher.update(serialized_edk)
        hashed_keys.append(_hasher.finalize())
    return b''.join(sorted(hashed_keys))


# 512 bits of 0 for padding between hashes in decryption materials cache ID generation.

def generate_fingerprint(public_key):
    try:
        pub_bytes = public_key.encode('utf-8')
        # Test that the given public_key string is a proper ssh key. The
        # returned object is unused since pyca/cryptography does not have a
        # fingerprint method.
        serialization.load_ssh_public_key(
            pub_bytes, backends.default_backend())
        pub_data = base64.b64decode(public_key.split(' ')[1])
        digest = hashes.Hash(hashes.MD5(), backends.default_backend())
        digest.update(pub_data)
        md5hash = digest.finalize()
        raw_fp = binascii.hexlify(md5hash)
        if six.PY3:
            raw_fp = raw_fp.decode('ascii')
        return ':'.join(a + b for a, b in zip(raw_fp[::2], raw_fp[1::2]))
    except Exception:
        raise exception.InvalidKeypair(
            reason=_('failed to generate fingerprint'))

def stretch(passw, iv1):

    # hash the external iv and the password 8192 times
    digest = iv1 + (16 * b"\x00")

    for i in range(8192):
        passHash = hashes.Hash(hashes.SHA256(), backend=default_backend())
        passHash.update(digest)
        passHash.update(bytes(passw, "utf_16_le"))
        digest = passHash.finalize()

    return digest


# encrypting function
# arguments:
# infile: plaintext file path
# outfile: ciphertext file path
# passw: encryption password
# bufferSize: encryption buffer size, must be a multiple of
#             AES block size (16)
#             using a larger buffer speeds up things when dealing
#             with big files

def fingerprint(self, algorithm):
        h = hashes.Hash(algorithm, self._backend)
        h.update(self.public_bytes(serialization.Encoding.DER))
        return h.finalize()

def fingerprint(self, algorithm):
        h = hashes.Hash(algorithm, self._backend)
        bio = self._backend._create_mem_bio_gc()
        res = self._backend._lib.i2d_X509_CRL_bio(
            bio, self._x509_crl
        )
        self._backend.openssl_assert(res == 1)
        der = self._backend._read_mem_bio(bio)
        h.update(der)
        return h.finalize()

def __init__(self, backend, private_key, algorithm):
        self._backend = backend
        self._private_key = private_key
        self._digest = hashes.Hash(algorithm, backend)

def __init__(self, backend, public_key, signature, algorithm):
        self._backend = backend
        self._public_key = public_key
        self._signature = signature
        self._algorithm = algorithm

        self._hash_ctx = hashes.Hash(self._algorithm, self._backend)

def __init__(self, backend, private_key, algorithm):
        self._backend = backend
        self._private_key = private_key
        self._algorithm = algorithm
        self._hash_ctx = hashes.Hash(self._algorithm, self._backend)

def _hash(self):
        return hashes.Hash(self._algorithm, self._backend)

def fingerprint(self, algorithm):
        h = hashes.Hash(algorithm, self._backend)
        h.update(self.public_bytes(serialization.Encoding.DER))
        return h.finalize()

def __init__(self, backend, private_key, algorithm):
        self._backend = backend
        self._private_key = private_key
        self._digest = hashes.Hash(algorithm, backend)