コード例 #1
0
ファイル: stanza_session.py プロジェクト: xiayuming/gajim
    def make_dhfield(self, modp_options, sigmai):
        dhs = []

        for modp in modp_options:
            p = dh.primes[modp]
            g = dh.generators[modp]

            x = crypto.srand(2**(2 * self.n - 1), p - 1)

            # FIXME this may be a source of performance issues
            e = crypto.powmod(g, x, p)

            self.xes[modp] = x
            self.es[modp] = e

            if sigmai:
                dhs.append(
                    base64.b64encode(crypto.encode_mpi(e)).decode('utf-8'))
                name = 'dhkeys'
            else:
                He = crypto.sha256(crypto.encode_mpi(e))
                dhs.append(base64.b64encode(He).decode('utf-8'))
                name = 'dhhashes'

        return nbxmpp.DataField(name=name, typ='hidden', value=dhs)
コード例 #2
0
ファイル: stanza_session.py プロジェクト: irl/gajim
    def make_dhfield(self, modp_options, sigmai):
        dhs = []

        for modp in modp_options:
            p = dh.primes[modp]
            g = dh.generators[modp]

            x = crypto.srand(2 ** (2 * self.n - 1), p - 1)

            # FIXME this may be a source of performance issues
            e = crypto.powmod(g, x, p)

            self.xes[modp] = x
            self.es[modp] = e

            if sigmai:
                dhs.append(base64.b64encode(crypto.encode_mpi(e)))
                name = 'dhkeys'
            else:
                He = crypto.sha256(crypto.encode_mpi(e))
                dhs.append(base64.b64encode(He))
                name = 'dhhashes'

        return nbxmpp.DataField(name=name, typ='hidden', value=dhs)
コード例 #3
0
ファイル: stanza_session.py プロジェクト: tdruiva/gajim
    def respond_e2e_bob(self, form, negotiated, not_acceptable):
        response = xmpp.Message()
        feature = response.NT.feature
        feature.setNamespace(xmpp.NS_FEATURE)

        x = xmpp.DataForm(typ='submit')

        x.addChild(node=xmpp.DataField(name='FORM_TYPE', value='urn:xmpp:ssn'))
        x.addChild(node=xmpp.DataField(name='accept', value='true'))

        for name in negotiated:
            # some fields are internal and should not be sent
            if not name in ('send_pubkey', 'recv_pubkey'):
                x.addChild(
                    node=xmpp.DataField(name=name, value=negotiated[name]))

        self.negotiated = negotiated

        # the offset of the group we chose (need it to match up with the dhhash)
        group_order = 0
        self.modp = int(form.getField('modp').getOptions()[group_order][1])
        x.addChild(node=xmpp.DataField(name='modp', value=self.modp))

        g = dh.generators[self.modp]
        p = dh.primes[self.modp]

        self.n_o = base64.b64decode(form['my_nonce'])

        dhhashes = form.getField('dhhashes').getValues()
        self.negotiated['He'] = base64.b64decode(
            dhhashes[group_order].encode('utf8'))

        bytes = int(self.n / 8)

        self.n_s = crypto.generate_nonce()

        # n-bit random number
        self.c_o = crypto.decode_mpi(crypto.random_bytes(bytes))
        self.c_s = self.c_o ^ (2**(self.n - 1))

        self.y = crypto.srand(2**(2 * self.n - 1), p - 1)
        self.d = crypto.powmod(g, self.y, p)

        to_add = {
            'my_nonce': self.n_s,
            'dhkeys': crypto.encode_mpi(self.d),
            'counter': crypto.encode_mpi(self.c_o),
            'nonce': self.n_o
        }

        for name in to_add:
            b64ed = base64.b64encode(to_add[name])
            x.addChild(node=xmpp.DataField(name=name, value=b64ed))

        self.form_o = ''.join(
            map(lambda el: xmpp.c14n.c14n(el), form.getChildren()))
        self.form_s = ''.join(
            map(lambda el: xmpp.c14n.c14n(el), x.getChildren()))

        self.status = 'responded-e2e'

        feature.addChild(node=x)

        if not_acceptable:
            response = xmpp.Error(response, xmpp.ERR_NOT_ACCEPTABLE)

            feature = xmpp.Node(xmpp.NS_FEATURE + ' feature')

            for f in not_acceptable:
                n = xmpp.Node('field')
                n['var'] = f
                feature.addChild(node=n)

            response.T.error.addChild(node=feature)

        self.send(response)
コード例 #4
0
ファイル: stanza_session.py プロジェクト: tdruiva/gajim
    def get_shared_secret(self, e, y, p):
        if (not 1 < e < (p - 1)):
            raise exceptions.NegotiationError, 'invalid DH value'

        return crypto.sha256(crypto.encode_mpi(crypto.powmod(e, y, p)))
コード例 #5
0
ファイル: stanza_session.py プロジェクト: irl/gajim
    def respond_e2e_bob(self, form, negotiated, not_acceptable):
        """
        4.3 esession response (bob)
        """
        response = nbxmpp.Message()
        feature = response.NT.feature
        feature.setNamespace(nbxmpp.NS_FEATURE)

        x = nbxmpp.DataForm(typ='submit')

        x.addChild(node=nbxmpp.DataField(name='FORM_TYPE',
            value='urn:xmpp:ssn'))
        x.addChild(node=nbxmpp.DataField(name='accept', value='true'))

        for name in negotiated:
            # some fields are internal and should not be sent
            if not name in ('send_pubkey', 'recv_pubkey'):
                x.addChild(node=nbxmpp.DataField(name=name,
                    value=negotiated[name]))

        self.negotiated = negotiated

        # the offset of the group we chose (need it to match up with the dhhash)
        group_order = 0
        modp_f = form.getField('modp')
        if not modp_f:
            return
        self.modp = int(modp_f.getOptions()[group_order][1])
        x.addChild(node=nbxmpp.DataField(name='modp', value=self.modp))

        g = dh.generators[self.modp]
        p = dh.primes[self.modp]

        self.n_o = base64.b64decode(form['my_nonce'])

        dhhashes_f = form.getField('dhhashes')
        if not dhhashes_f:
            return
        dhhashes = dhhashes_f.getValues()
        self.negotiated['He'] = base64.b64decode(dhhashes[group_order].encode(
                'utf8'))

        bytes = int(self.n / 8)

        self.n_s = crypto.generate_nonce()

        # n-bit random number
        self.c_o = crypto.decode_mpi(crypto.random_bytes(bytes))
        self.c_s = self.c_o ^ (2 ** (self.n - 1))

        self.y = crypto.srand(2 ** (2 * self.n - 1), p - 1)
        self.d = crypto.powmod(g, self.y, p)

        to_add = {'my_nonce': self.n_s,
                'dhkeys': crypto.encode_mpi(self.d),
                'counter': crypto.encode_mpi(self.c_o),
                'nonce': self.n_o}

        for name in to_add:
            b64ed = base64.b64encode(to_add[name])
            x.addChild(node=nbxmpp.DataField(name=name, value=b64ed))

        self.form_o = ''.join(nbxmpp.c14n.c14n(el, self._is_buggy_gajim()) for \
            el in form.getChildren())
        self.form_s = ''.join(nbxmpp.c14n.c14n(el, self._is_buggy_gajim()) for \
            el in x.getChildren())

        self.status = 'responded-e2e'

        feature.addChild(node=x)

        if not_acceptable:
            response = nbxmpp.Error(response, nbxmpp.ERR_NOT_ACCEPTABLE)

            feature = nbxmpp.Node(nbxmpp.NS_FEATURE + ' feature')

            for f in not_acceptable:
                n = nbxmpp.Node('field')
                n['var'] = f
                feature.addChild(node=n)

            response.T.error.addChild(node=feature)

        self.send(response)
コード例 #6
0
ファイル: stanza_session.py プロジェクト: irl/gajim
    def get_shared_secret(self, e, y, p):
        if (not 1 < e < (p - 1)):
            raise NegotiationError('invalid DH value')

        return crypto.sha256(crypto.encode_mpi(crypto.powmod(e, y, p)))
コード例 #7
0
ファイル: stanza_session.py プロジェクト: kevin-teddy/gajim
    def respond_e2e_bob(self, form, negotiated, not_acceptable):
        response = xmpp.Message()
        feature = response.NT.feature
        feature.setNamespace(xmpp.NS_FEATURE)

        x = xmpp.DataForm(typ="submit")

        x.addChild(node=xmpp.DataField(name="FORM_TYPE", value="urn:xmpp:ssn"))
        x.addChild(node=xmpp.DataField(name="accept", value="true"))

        for name in negotiated:
            # some fields are internal and should not be sent
            if not name in ("send_pubkey", "recv_pubkey"):
                x.addChild(node=xmpp.DataField(name=name, value=negotiated[name]))

        self.negotiated = negotiated

        # the offset of the group we chose (need it to match up with the dhhash)
        group_order = 0
        self.modp = int(form.getField("modp").getOptions()[group_order][1])
        x.addChild(node=xmpp.DataField(name="modp", value=self.modp))

        g = dh.generators[self.modp]
        p = dh.primes[self.modp]

        self.n_o = base64.b64decode(form["my_nonce"])

        dhhashes = form.getField("dhhashes").getValues()
        self.negotiated["He"] = base64.b64decode(dhhashes[group_order].encode("utf8"))

        bytes = int(self.n / 8)

        self.n_s = crypto.generate_nonce()

        # n-bit random number
        self.c_o = crypto.decode_mpi(crypto.random_bytes(bytes))
        self.c_s = self.c_o ^ (2 ** (self.n - 1))

        self.y = crypto.srand(2 ** (2 * self.n - 1), p - 1)
        self.d = crypto.powmod(g, self.y, p)

        to_add = {
            "my_nonce": self.n_s,
            "dhkeys": crypto.encode_mpi(self.d),
            "counter": crypto.encode_mpi(self.c_o),
            "nonce": self.n_o,
        }

        for name in to_add:
            b64ed = base64.b64encode(to_add[name])
            x.addChild(node=xmpp.DataField(name=name, value=b64ed))

        self.form_o = "".join(map(lambda el: xmpp.c14n.c14n(el), form.getChildren()))
        self.form_s = "".join(map(lambda el: xmpp.c14n.c14n(el), x.getChildren()))

        self.status = "responded-e2e"

        feature.addChild(node=x)

        if not_acceptable:
            response = xmpp.Error(response, xmpp.ERR_NOT_ACCEPTABLE)

            feature = xmpp.Node(xmpp.NS_FEATURE + " feature")

            for f in not_acceptable:
                n = xmpp.Node("field")
                n["var"] = f
                feature.addChild(node=n)

            response.T.error.addChild(node=feature)

        self.send(response)
コード例 #8
0
ファイル: stanza_session.py プロジェクト: kevin-teddy/gajim
    def get_shared_secret(self, e, y, p):
        if not 1 < e < (p - 1):
            raise exceptions.NegotiationError, "invalid DH value"

        return crypto.sha256(crypto.encode_mpi(crypto.powmod(e, y, p)))