def decodeInvitePacket(self, password, packet):
#print('decodeInvitePacket('+password+', '+encode(packet)+')')
self.salt, packet=splitField(packet, SALT_LENGTH)
#print('salt('+encode(self.salt)+', '+encode(packet)+')')
sk=pbkdf(password, self.salt)
#print('sk: '+encode(sk))
self.decodeDustPacket(sk, packet)
self.invite=InviteMessage()
self.invite.decodeInviteMessage(self.data)
return self.invite
def getBytes(self, n):
self.count=self.count+n
while len(self.entropy)<n:
if self.pers:
result=skein512(self.iv, mac=self.key, pers=self.pers, digest_bits=(BLOCK_SIZE)*8)
else:
result=skein512(self.iv, mac=self.key, digest_bits=(BLOCK_SIZE)*8)
self.entropy=self.entropy+result
self.iv=result
b, self.entropy=splitField(self.entropy, n)
return b
def decodeInvitePacket(self, password, packet):
#print('decodeInvitePacket('+password+', '+encode(packet)+')')
self.salt, packet = splitField(packet, SALT_LENGTH)
#print('salt('+encode(self.salt)+', '+encode(packet)+')')
sk = pbkdf(password, self.salt)
#print('sk: '+encode(sk))
self.decodeDustPacket(sk, packet)
self.invite = InviteMessage()
self.invite.decodeInviteMessage(self.data)
return self.invite
def decodeDustPacket(self, key, packet):
self.key=key
self.packet=packet
self.mac, self.ciphertext=splitField(self.packet, MAC_SIZE)
self.iv, self.encrypted=splitField(self.ciphertext, IV_SIZE)
self.payload=decrypt(self.key, self.iv, self.encrypted)
self.timestamp, self.dataLength, self.paddingLength, self.data=splitFields(self.payload, [TIMESTAMP_SIZE, DATA_LENGTH_SIZE, PADDING_LENGTH_SIZE])
self.timestamp=struct.unpack("I", self.timestamp)[0]
self.dataLength=struct.unpack("H", self.dataLength)[0]
self.paddingLength=struct.unpack("B", self.paddingLength)[0]
self.data, extra=splitField(self.data, self.dataLength)
payloadLength=TIMESTAMP_SIZE+DATA_LENGTH_SIZE+PADDING_LENGTH_SIZE+len(self.data)
self.payload=self.payload[:payloadLength]
ciphertextLength=IV_SIZE+payloadLength
self.ciphertext=self.ciphertext[:ciphertextLength]
realPacketLength=MAC_SIZE+ciphertextLength+self.paddingLength
if len(packet)>realPacketLength:
self.remaining=packet[realPacketLength:]
def decodeDustPacket(self, key, packet):
self.key=key
self.packet=packet
self.mac, self.ciphertext=splitField(self.packet, MAC_SIZE)
self.iv, self.encrypted=splitField(self.ciphertext, IV_SIZE)
self.payload=decrypt(self.key, self.iv, self.encrypted)
self.timestamp, self.dataLength, self.paddingLength, self.data=splitFields(self.payload, [TIMESTAMP_SIZE, DATA_LENGTH_SIZE, PADDING_LENGTH_SIZE])
self.timestamp=struct.unpack("I", self.timestamp)[0]
self.dataLength=struct.unpack("H", self.dataLength)[0]
self.paddingLength=struct.unpack("B", self.paddingLength)[0]
self.data, extra=splitField(self.data, self.dataLength)
payloadLength=TIMESTAMP_SIZE+DATA_LENGTH_SIZE+PADDING_LENGTH_SIZE+len(self.data)
self.payload=self.payload[:payloadLength]
ciphertextLength=IV_SIZE+payloadLength
self.ciphertext=self.ciphertext[:ciphertextLength]
realPacketLength=MAC_SIZE+ciphertextLength+self.paddingLength
if len(packet)>realPacketLength:
self.remaining=packet[realPacketLength:]
def getBytes(self, n):
self.count = self.count + n
while len(self.entropy) < n:
if self.pers:
result = skein512(self.iv,
mac=self.key,
pers=self.pers,
digest_bits=(BLOCK_SIZE) * 8)
else:
result = skein512(self.iv,
mac=self.key,
digest_bits=(BLOCK_SIZE) * 8)
self.entropy = self.entropy + result
self.iv = result
b, self.entropy = splitField(self.entropy, n)
return b
def decodeDustmailInvitePacket(self, password, packet): self.salt, packet=splitField(packet, SALT_LENGTH) sk=pbkdf(password, self.salt) self.decodeDustPacket(sk, packet) self.pubkey, self.invite=splitField(self.data, PUBKEY_LENGTH)