Enhancement: ability to use AES192/256 encryption w/appropriate version-byte flag

[tknarr]

Is it possible to enhance the Fernet spec to allow the optional use of AES192/256 encryption with an appropriate flag in the version byte to indicate the encryption used? I've run into projects where Fernet would be a good fit but 256-bit encryption is required. Nothing in the current spec would interfere with allowing larger key lengths, and in the implementations I've tried it's simply a matter of setting the encryption to use the longer key and the rest of the implementation is oblivious to the change.

[tknarr]

From looking at it I can make the changes to the Ruby implementation, and I think I can do the other implementations too. In Python I handled the version byte by carving out bits 5-6 to indicate the encryption level, 00 = 128-bit, 01 = 192-bit, 10 = 256-bit, giving version bytes of 0x80, 0xA0 and 0xC0 respectively. That leaves bits 0-5 for version numbering.

[bedros]

I need 256 bit key as well, the 128 bit is not strong enough these days.

[tknarr]

I have pull requests open for the spec and the Ruby implementation, working on one for the Go implementation, and the needed changes to the Python implementation in the cryptography package.

[theonewolf]

The ability to use AES 256 would help match other projects such as Vault.

Is there any expectation for maintainers to accept this pull request?

:+1:

[jborrey]

+1

[erikreppel]

+1