python类RSAPublicNumbers()的实例源码

def _load_ssh_rsa_public_key(key_type, decoded_data, backend):
    e, rest = _read_next_mpint(decoded_data)
    n, rest = _read_next_mpint(rest)

    if rest:
        raise ValueError('Key body contains extra bytes.')

    return rsa.RSAPublicNumbers(e, n).public_key(backend)

def _load_ssh_rsa_public_key(key_type, decoded_data, backend):
    e, rest = _read_next_mpint(decoded_data)
    n, rest = _read_next_mpint(rest)

    if rest:
        raise ValueError('Key body contains extra bytes.')

    return rsa.RSAPublicNumbers(e, n).public_key(backend)

def _load_public_key(self, e, n):
        def to_int(x):
            bs = base64.urlsafe_b64decode(x + "==")
            return int.from_bytes(bs, byteorder="big")

        ei = to_int(e)
        ni = to_int(n)
        numbers = RSAPublicNumbers(ei, ni)
        public_key = numbers.public_key(backend=default_backend())
        pem = public_key.public_bytes(
            encoding=serialization.Encoding.PEM,
            format=serialization.PublicFormat.SubjectPublicKeyInfo
        )
        return pem

def jwk_to_pubkey(jwk):
    if jwk['kty'] == 'oct':
        return jwk_to_bytes(jwk['k'])
    elif jwk['kty'] == 'EC':
        numbers = ec.EllipticCurvePublicNumbers(jwk_to_uint(jwk['x']),
                                                jwk_to_uint(jwk['y']),
                                                jwk_to_curve(jwk['crv']))
        return numbers.public_key(backend)
    elif jwk['kty'] == 'RSA':
        numbers = rsa.RSAPublicNumbers(jwk_to_uint(jwk['e']),
                                       jwk_to_uint(jwk['n']))
        return numbers.public_key(backend)

def __init__(self, ssh_public_key):
        """
        Extracts the useful RSA Public Key information from an SSH Public Key file.
        :param ssh_public_key: SSH Public Key file contents. (i.e. 'ssh-rsa AAAAB3NzaC1yc2E..').
        """
        super(RSAPublicKey, self).__init__()

        self.type = SSHPublicKeyType.RSA

        split_ssh_public_key = ssh_public_key.split(' ')
        split_key_len = len(split_ssh_public_key)

        # is there a key comment at the end?
        if split_key_len > 2:
            self.key_comment = ' '.join(split_ssh_public_key[2:])
        else:
            self.key_comment = ''

        public_key = serialization.load_ssh_public_key(ssh_public_key, default_backend())
        ca_pub_numbers = public_key.public_numbers()
        if not isinstance(ca_pub_numbers, RSAPublicNumbers):
            raise TypeError("Public Key is not the correct type or format")

        self.key_size = public_key.key_size
        self.e = ca_pub_numbers.e
        self.n = ca_pub_numbers.n

        key_bytes = base64.b64decode(split_ssh_public_key[1])
        fingerprint = hashlib.md5(key_bytes).hexdigest()

        self.fingerprint = 'RSA ' + ':'.join(
            fingerprint[i:i + 2] for i in range(0, len(fingerprint), 2))

def _fromString_BLOB(cls, blob):
        """
        Return a public key object corresponding to this public key blob.
        The format of a RSA public key blob is::
            string 'ssh-rsa'
            integer e
            integer n

        The format of a DSA public key blob is::
            string 'ssh-dss'
            integer p
            integer q
            integer g
            integer y

        The format of ECDSA-SHA2-* public key blob is::
            string 'ecdsa-sha2-[identifier]'
            integer x
            integer y

            identifier is the standard NIST curve name.

        @type blob: L{bytes}
        @param blob: The key data.

        @return: A new key.
        @rtype: L{twisted.conch.ssh.keys.Key}
        @raises BadKeyError: if the key type (the first string) is unknown.
        """
        keyType, rest = common.getNS(blob)
        if keyType == b'ssh-rsa':
            e, n, rest = common.getMP(rest, 2)
            return cls(
                rsa.RSAPublicNumbers(e, n).public_key(default_backend()))
        elif keyType == b'ssh-dss':
            p, q, g, y, rest = common.getMP(rest, 4)
            return cls(
                dsa.DSAPublicNumbers(
                    y=y,
                    parameter_numbers=dsa.DSAParameterNumbers(
                        p=p,
                        q=q,
                        g=g
                    )
                ).public_key(default_backend())
            )
        elif keyType in _curveTable:
            # First we have to make an EllipticCuvePublicNumbers from the
            # provided curve and points,
            # then turn it into a public key object.
            return cls(
                ec.EllipticCurvePublicNumbers.from_encoded_point(
                      _curveTable[keyType],
                       common.getNS(rest, 2)[1]).public_key(default_backend()))
        else:
            raise BadKeyError('unknown blob type: %s' % (keyType,))

def _fromRSAComponents(cls, n, e, d=None, p=None, q=None, u=None):
        """
        Build a key from RSA numerical components.

        @type n: L{int}
        @param n: The 'n' RSA variable.

        @type e: L{int}
        @param e: The 'e' RSA variable.

        @type d: L{int} or L{None}
        @param d: The 'd' RSA variable (optional for a public key).

        @type p: L{int} or L{None}
        @param p: The 'p' RSA variable (optional for a public key).

        @type q: L{int} or L{None}
        @param q: The 'q' RSA variable (optional for a public key).

        @type u: L{int} or L{None}
        @param u: The 'u' RSA variable. Ignored, as its value is determined by
        p and q.

        @rtype: L{Key}
        @return: An RSA key constructed from the values as given.
        """
        publicNumbers = rsa.RSAPublicNumbers(e=e, n=n)
        if d is None:
            # We have public components.
            keyObject = publicNumbers.public_key(default_backend())
        else:
            privateNumbers = rsa.RSAPrivateNumbers(
                p=p,
                q=q,
                d=d,
                dmp1=rsa.rsa_crt_dmp1(d, p),
                dmq1=rsa.rsa_crt_dmq1(d, q),
                iqmp=rsa.rsa_crt_iqmp(p, q),
                public_numbers=publicNumbers,
            )
            keyObject = privateNumbers.private_key(default_backend())

        return cls(keyObject)