[14864] in cryptography@c2.net mail archive
Re: origin of SHA 224 initial hash values
daemon@ATHENA.MIT.EDU (Donald Eastlake 3rd)
Sat Dec 6 19:55:49 2003
X-Original-To: cryptography@metzdowd.com
X-Original-To: cryptography@metzdowd.com
Date: Sat, 6 Dec 2003 14:06:56 -0500 (EST)
From: Donald Eastlake 3rd <dee3@torque.pothole.com>
To: crypto list <cryptography@metzdowd.com>
In-Reply-To: <E872D604-27C5-11D8-A886-000A9573C58A@kingprimate.com>
I don't know about 224 and there isn't any 128 but for SHA-1 (160) the
initial values seem to be just an obvious pattern:
A = 0x67452301
B = 0xefcdab89
C = 0x89badcfe
D = 0x10325476
E = 0xc3d2e1f0
If for 128 you meant MD-5, its initial values are an even simpler
pattern
A = 0x01234567
B = 0x89abcdef
C = 0xfedcba98
D = 0x76543210
Thanks,
Donald
======================================================================
Donald E. Eastlake 3rd dee3@torque.pothole.com
155 Beaver Street +1-508-634-2066(h) +1-508-786-7554(w)
Milford, MA 01757 USA Donald.Eastlake@motorola.com
On Sat, 6 Dec 2003, Jeremiah Rogers wrote:
> Date: Sat, 6 Dec 2003 03:26:36 -0500
> From: Jeremiah Rogers <jeremiah@kingprimate.com>
> To: crypto list <cryptography@metzdowd.com>
> Subject: origin of SHA 224 initial hash values
>
> I'm having trouble pinpointing the origin of the initial hash values
> for SHA 224 and, for that matter, 128. These values are defined as hex
> representations of cube roots of primes for sha-1 of lengths 256, 384
> and 512, but I can't find where they were obtained for the shorter
> lengths.
>
> Thanks and apologies if this is something well known.
>
> - jeremiah
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