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 [EMAIL PROTECTED] 155 Beaver Street +1-508-634-2066(h) +1-508-786-7554(w) Milford, MA 01757 USA [EMAIL PROTECTED] On Sat, 6 Dec 2003, Jeremiah Rogers wrote: > Date: Sat, 6 Dec 2003 03:26:36 -0500 > From: Jeremiah Rogers <[EMAIL PROTECTED]> > To: crypto list <[EMAIL PROTECTED]> > 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 --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]
