RE: 2 interesting projects...

[Leif Svalgaard <l.svalgaard@xxxxxxxxxxxxx>]

What I meant was that twofish already exists as C-code.
Gene did it in MI because the swap would be too
cumbersome (slow?) in C. Correct Gene?
If so, similar considerations may apply to PGP...


> -----Original Message-----
> From: dhandy@isgroup.net [SMTP:dhandy@isgroup.net]
> Sent: Tuesday, February 01, 2000 5:22 PM
> To:   MI400@midrange.com
> Subject:      Re: 2 interesting projects...
> 
> Lief,
> 
> >but isn't that true of the twofish algorithm too?
> >So why did Gene make an MI version?
> 
> No; TwoFish has been granted free use rights for *Public.
> 
> One reason Gene needed an MI version is the way the TwoFish algorithm
> reuses the results of integer operations as part of the encryption
> process.  When used on a single platform, the algorithm would be
> symmetrical, ie would decrypt correctly.  But the Big-Endian vs
> Little-Endian differences in integer storage formats in the 400 vs
> Intel platforms means the files would not be cross-platform
> compatible.  So Gene's MI program does a swap on every 4 bytes to
> mimic the Intel format to get cross-platform support.
> 
> Doug
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