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Date: Wed, 11 Oct 2017 14:29:09 -0700
From: Linus Torvalds <>
To: "Jason A. Donenfeld" <>
Cc: "Tobin C. Harding" <>, 
	"" <>, KVM list <>, 
	Linux Kernel Mailing List <>, Kees Cook <>, 
	Paolo Bonzini <>, Tycho Andersen <>, 
	"Roberts, William C" <>, Tejun Heo <>, 
	Jordan Glover <>, Greg KH <>, 
	Petr Mladek <>, Joe Perches <>, Ian Campbell <>, 
	Sergey Senozhatsky <>, Catalin Marinas <>, 
	Will Deacon <>, Steven Rostedt <>, 
	Chris Fries <>, Dave Weinstein <>, 
	Daniel Micay <>, Djalal Harouni <>
Subject: Re: [PATCH 0/3] add %pX specifier

On Wed, Oct 11, 2017 at 1:11 PM, Jason A. Donenfeld <> wrote:
> Indeed the correct functions to use would be siphash_1u32 or
> siphash_1u64, depending. Depending on the popularity of that, we might
> even consider making a siphash_1ulong helper, I suppose.

Yeah, siphash is probably the sanest thing to use.

How bad would it be to use HalfSipHash on 32-bit architectures?

On a 32-bit machine, the full siphash is pretty expensive - big
constants, and lots of 64-bit shifts. And 32-bit machines also tend to
mean "slow machines" these days.

I suspect there's little point in worrying a ton about the 64-bit key,
considering that I think the *input* is generally more guessable than
the output or the key.


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