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Christopher A. Taylor chris-gc

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import device;
exports.TARGET_WIDTH = 576;
// fixed aspect ratio for main content area
exports.CONTENT_RATIO = 2 / 3;
// maximum aspect ratio for background image
exports.BG_RATIO = 9 / 16;
chris-gc / gist:9194660
Last active August 29, 2015 13:56
PFS Key Ratchet
And I have a design specced out for adding PFS to Calico without
adding any overhead:
The problem is that right now Calico never rekeys. So long encrypted
communications, if one side is compromised, can be decrypted from the
start. To allow for future secrecy, rekeying will be added controlled
by the client automatically on a timer.
Right now I'm using 24 bits for the IV. This is actually pretty excessive.
But 16 bits is not enough.

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chris-gc / gf256
Created January 15, 2014 22:02
Efficient, simple GF(256) math
//// Utility: GF(256) Multiply and Divide functions
Branchless multiply and divide construction from
"Fast Software Implementations of Finite Field Operations (Extended Abstract)"
by Cheng Huang and Lihao Xu
Small corrections made to paper (Q = 255):
+ The EXP_TABLE needs to have 512*2+1 elements to handle 0*0 = 0 case.
+ Element 255*2 should be set to 1.