def decrypt_stanza(self, stanza):
# delete the unencrypted explanation body, if it exists
orig_body = stanza.getTag("body")
if orig_body:
stanza.delChild(orig_body)
c = stanza.getTag(name="c", namespace="http://www.xmpp.org/extensions/xep-0200.html#ns")
stanza.delChild(c)
# contents of <c>, minus <mac>, minus whitespace
macable = "".join(map(str, filter(lambda x: x.getName() != "mac", c.getChildren())))
received_mac = base64.b64decode(c.getTagData("mac"))
calculated_mac = self.hmac(self.km_o, macable + crypto.encode_mpi_with_padding(self.c_o))
if not calculated_mac == received_mac:
raise exceptions.DecryptionError, "bad signature"
m_final = base64.b64decode(c.getTagData("data"))
m_compressed = self.decrypt(m_final)
plaintext = self.decompress(m_compressed)
try:
parsed = xmpp.Node(node="<node>" + plaintext + "</node>")
except Exception:
raise exceptions.DecryptionError, "decrypted <data/> not parseable as XML"
for child in parsed.getChildren():
stanza.addChild(node=child)
return stanza
def decrypt_stanza(self, stanza):
"""
Delete the unencrypted explanation body, if it exists
"""
orig_body = stanza.getTag('body')
if orig_body:
stanza.delChild(orig_body)
c = stanza.getTag(
name='c',
namespace='http://www.xmpp.org/extensions/xep-0200.html#ns')
stanza.delChild(c)
# contents of <c>, minus <mac>, minus whitespace
macable = ''.join(
str(x) for x in c.getChildren() if x.getName() != 'mac')
macable = macable.encode('utf-8')
received_mac = base64.b64decode(c.getTagData('mac'))
calculated_mac = self.hmac(self.km_o, macable + \
crypto.encode_mpi_with_padding(self.c_o))
if not calculated_mac == received_mac:
raise DecryptionError('bad signature')
m_final = base64.b64decode(c.getTagData('data'))
m_compressed = self.decrypt(m_final)
plaintext = self.decompress(m_compressed).decode('utf-8')
try:
parsed = nbxmpp.Node(node='<node>' + plaintext + '</node>')
except Exception:
raise DecryptionError('decrypted <data/> not parseable as XML')
for child in parsed.getChildren():
stanza.addChild(node=child)
# replace non-character unicode
body = stanza.getBody()
if body:
stanza.setBody(
self.conn.connection.Dispatcher.replace_non_character(body))
return stanza
def decrypt_stanza(self, stanza):
"""
Delete the unencrypted explanation body, if it exists
"""
orig_body = stanza.getTag('body')
if orig_body:
stanza.delChild(orig_body)
c = stanza.getTag(name='c',
namespace='http://www.xmpp.org/extensions/xep-0200.html#ns')
stanza.delChild(c)
# contents of <c>, minus <mac>, minus whitespace
macable = ''.join(str(x) for x in c.getChildren() if x.getName() != 'mac')
macable = macable.encode('utf-8')
received_mac = base64.b64decode(c.getTagData('mac'))
calculated_mac = self.hmac(self.km_o, macable + \
crypto.encode_mpi_with_padding(self.c_o))
if not calculated_mac == received_mac:
raise DecryptionError('bad signature')
m_final = base64.b64decode(c.getTagData('data'))
m_compressed = self.decrypt(m_final)
plaintext = self.decompress(m_compressed).decode('utf-8')
try:
parsed = nbxmpp.Node(node='<node>' + plaintext + '</node>')
except Exception:
raise DecryptionError('decrypted <data/> not parseable as XML')
for child in parsed.getChildren():
stanza.addChild(node=child)
# replace non-character unicode
body = stanza.getBody()
if body:
stanza.setBody(
self.conn.connection.Dispatcher.replace_non_character(body))
return stanza
def decrypt_stanza(self, stanza):
# delete the unencrypted explanation body, if it exists
orig_body = stanza.getTag('body')
if orig_body:
stanza.delChild(orig_body)
c = stanza.getTag(
name='c',
namespace='http://www.xmpp.org/extensions/xep-0200.html#ns')
stanza.delChild(c)
# contents of <c>, minus <mac>, minus whitespace
macable = ''.join(
map(str, filter(lambda x: x.getName() != 'mac', c.getChildren())))
received_mac = base64.b64decode(c.getTagData('mac'))
calculated_mac = self.hmac(self.km_o, macable + \
crypto.encode_mpi_with_padding(self.c_o))
if not calculated_mac == received_mac:
raise exceptions.DecryptionError, 'bad signature'
m_final = base64.b64decode(c.getTagData('data'))
m_compressed = self.decrypt(m_final)
plaintext = self.decompress(m_compressed)
try:
parsed = xmpp.Node(node='<node>' + plaintext + '</node>')
except Exception:
raise exceptions.DecryptionError, 'decrypted <data/> not parseable as XML'
for child in parsed.getChildren():
stanza.addChild(node=child)
return stanza
def decryptcounter(self):
self.c_o = (self.c_o + 1) % (2**self.n)
return crypto.encode_mpi_with_padding(self.c_o)
def encryptcounter(self):
self.c_s = (self.c_s + 1) % (2**self.n)
return crypto.encode_mpi_with_padding(self.c_s)
def decryptcounter(self):
self.c_o = (self.c_o + 1) % (2 ** self.n)
return crypto.encode_mpi_with_padding(self.c_o)
def encryptcounter(self):
self.c_s = (self.c_s + 1) % (2 ** self.n)
return crypto.encode_mpi_with_padding(self.c_s)
