Re: [TLS] New Cached info draft

Marsh Ray <marsh@extendedsubset.com> Mon, 29 March 2010 15:47 UTC

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Date: Mon, 29 Mar 2010 10:47:29 -0500
From: Marsh Ray <marsh@extendedsubset.com>
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To: Stefan Santesson <stefan@aaa-sec.com>
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Cc: Adam Langley <agl@imperialviolet.org>, "tls@ietf.org" <tls@ietf.org>
Subject: Re: [TLS] New Cached info draft
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On 3/29/2010 5:36 AM, Stefan Santesson wrote:
> Marsh and all,
> 
> I would like to switch to FNV-1a.
> The reason being that FNV-1 has the downside that the last octet only flips
> bits in the lowest 8 bits of the digest value, while FNV-1a influence all 64
> bits (by changing the order of multiplication and XOR).
> 
> See also:
> http://sites.google.com/site/murmurhash/avalanche
> 
> The pseudocode for FNV-1a is:
> 
>       digest = FNV_offset_basis
>       for each octet_of_data to be digested {
>              digest = digest XOR octet_of_data
>              digest = digest * FNV_prime }
>       return digest
> 
> Could you run some test vectors also for FNV-1a?

Sure, here's what I get from the new pseudocode.

For input data:
0 bytes
Digest is: CB F2 9C E4 84 22 23 25
8 bytes

For input data:
0000  61                                                a
1 bytes
Digest is: AF 63 DC 4C 86 01 EC 8C
8 bytes

For input data:
0000  FF 00 00 01                                       ....
4 bytes
Digest is: 69 61 19 64 91 CC 68 2D
8 bytes

For input data:
0000  68 74 74 70 3A 2F 2F 65 6E 2E 77 69 6B 69 70 65   http://en.wikipe
0010  64 69 61 2E 6F 72 67 2F 77 69 6B 69 2F 46 6F 77   dia.org/wiki/Fow
0020  6C 65 72 5F 4E 6F 6C 6C 5F 56 6F 5F 68 61 73 68   ler_Noll_Vo_hash
48 bytes
Digest is: D9 B9 57 FB 7F E7 94 C5
8 bytes

- Marsh