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CAP prefix/clog
===============
Copyright (c) Soni L. \<fakedme plus irkv3 at gmail dot com>
This capability provides a mechanism for identifying and conveying a cryptographically secured list of messages to IRC clients.
This specification also suggests a mechanism by which IRC clients can sync logs, using the information provided by this capability.
Cap syntax
----------
The capability shall be specified as
prefix/clog=hash_type,hash_type/tag,tag,tag
Example:
prefix/clog=sha1,sha256/server-time
`server-time` is always implicitly specified, and should be omitted.
The `HASH` S2C command
----------------------
The `HASH` command shall be sent for hashes associated with a channel.
Each hash must be a cryptographic hash. Non-cryptographic hashes must be ignored. Broken hash algorithms should be avoided. MD5 is explicitly disallowed and must not be used.
The counter must be able to store numbers in the `0..2^62-1` range.
Syntax:
HASH #channel :hash_type=counter/hash,type=counter/hash,...
Example:
>>> JOIN #channel
<<< JOIN #channel
<<< NAMES etc
<<< HASH #channel :sha1=20,something_long
<<< HASH #channel :sha1=60,something_else sha256=70,another
Optionally, the server may include a server name with the HASH command:
<<< :server1.example.com HASH #channel :etc
<<< :server2.example.com HASH #channel :other
The `hash` message tag
----------------------
The `hash` mesaage tag shall be sent with every `PRIVMSG`, `TOPIC` and `NOTICE`.
Syntax:
hash=type=counter/short_hash,type=counter/short_hash,...
The use of `short_hash` lowers bandwidth requirements. Consult your cryptography expert for best practices on using cryptography.
Example:
TODO
The `SYNC` CTCP (informative)
-----------------------------
*This section is informative.*
The `SYNC` CTCP is a hypothetical CTCP for syncing logs.
Syntax:
SYNC <tox-compatible public key> <port> <host> <host> <...> -[nospam+checksum]
This is a highly flexible command supporting ipv4, ipv6, hostname, tor, i2p and tox ID.
Messages sent over non-tox channels must be encrypted with the tox-compatible public key.
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