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Link mode signalling generators

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Mark Qvist 2025-05-06 16:12:54 +02:00
parent 437da99d63
commit 40e040807a
1 changed files with 20 additions and 5 deletions
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25
RNS/Link.py
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@ -123,7 +123,15 @@ class Link:
MODE_PQ_RESERVED_2 = 0x05
MODE_PQ_RESERVED_3 = 0x06
MODE_PQ_RESERVED_4 = 0x07
enabled_modes = [MODE_AES128_CBC, MODE_AES256_CBC]
ENABLED_MODES = [MODE_AES128_CBC, MODE_AES256_CBC]
MODE_DESCRIPTIONS = {MODE_AES128_CBC: "AES_128_CBC",
MODE_AES256_CBC: "AES_256_CBC",
MODE_AES256_GCM: "MODE_AES256_GCM",
MODE_OTP_RESERVED: "MODE_OTP_RESERVED",
MODE_PQ_RESERVED_1: "MODE_PQ_RESERVED_1",
MODE_PQ_RESERVED_2: "MODE_PQ_RESERVED_2",
MODE_PQ_RESERVED_3: "MODE_PQ_RESERVED_3",
MODE_PQ_RESERVED_4: "MODE_PQ_RESERVED_4"}
MTU_BYTEMASK = 0x1FFFFF
MODE_BYTEMASK = 0xE0
@ -132,6 +140,12 @@ class Link:
def mtu_bytes(mtu):
return struct.pack(">I", mtu & Link.MTU_BYTEMASK)[1:]
@staticmethod
def signalling_bytes(mtu, mode):
if not mode in Link.ENABLED_MODES: raise TypeError(f"Requested link mode {Link.MODE_DESCRIPTIONS[mode]} not enabled")
signalling_value = (mtu & Link.MTU_BYTEMASK)+(((mode<<5) & Link.MODE_BYTEMASK)<<16)
return struct.pack(">I", signalling_value)[1:]
@staticmethod
def mtu_from_lr_packet(packet):
if len(packet.data) == Link.ECPUBSIZE+Link.LINK_MTU_SIZE:
@ -147,20 +161,21 @@ class Link:
@staticmethod
def mode_byte(mode):
if mode in Link.enabled_modes: return (mode << 5) & Link.MODE_BYTEMASK
if mode in Link.ENABLED_MODES: return (mode << 5) & Link.MODE_BYTEMASK
else: raise TypeError(f"Requested link mode {mode} not enabled")
@staticmethod
def mode_from_lr_packet(packet):
if len(packet.data) > Link.ECPUBSIZE:
return (packet.data[Link.ECPUBSIZE] << 16) + (packet.data[Link.ECPUBSIZE+1] << 8) + (packet.data[Link.ECPUBSIZE+2]) & Link.MODE_BYTEMASK
mode = (packet.data[Link.ECPUBSIZE] & Link.MODE_BYTEMASK) >> 5
return mode
else: return None
@staticmethod
def mode_from_lp_packet(packet):
if len(packet.data) > RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2:
mode_byte = packet.data[RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2:RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2+1]
return mode_byte & Link.MODE_BYTEMASK
mode = packet.data[RNS.Identity.SIGLENGTH//8+Link.ECPUBSIZE//2] >> 5
return mode
else: return None
@staticmethod