linux-kernel - RE: [PATCH v5 2/4] siphash: add Nu{32,64} helpers

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Date:   Fri, 16 Dec 2016 10:39:35 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'Jason A. Donenfeld'" <Jason@...c4.com>,
        Netdev <netdev@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        Ted Tso <tytso@....edu>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Eric Biggers <ebiggers3@...il.com>,
        Tom Herbert <tom@...bertland.com>,
        "George Spelvin" <linux@...encehorizons.net>,
        Vegard Nossum <vegard.nossum@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "luto@...capital.net" <luto@...capital.net>
Subject: RE: [PATCH v5 2/4] siphash: add Nu{32,64} helpers

From: Jason A. Donenfeld
> Sent: 15 December 2016 20:30
> These restore parity with the jhash interface by providing high
> performance helpers for common input sizes.
...
> +#define PREAMBLE(len) \
> +	u64 v0 = 0x736f6d6570736575ULL; \
> +	u64 v1 = 0x646f72616e646f6dULL; \
> +	u64 v2 = 0x6c7967656e657261ULL; \
> +	u64 v3 = 0x7465646279746573ULL; \
> +	u64 b = ((u64)len) << 56; \
> +	v3 ^= key[1]; \
> +	v2 ^= key[0]; \
> +	v1 ^= key[1]; \
> +	v0 ^= key[0];

Isn't that equivalent to:
	v0 = key[0];
	v1 = key[1];
	v2 = key[0] ^ (0x736f6d6570736575ULL ^ 0x646f72616e646f6dULL);
	v3 = key[1] ^ (0x646f72616e646f6dULL ^ 0x7465646279746573ULL);

Those constants also look like ASCII strings.
What cryptographic analysis has been done on the values?

	David