Linux can't decrypt cipher text created under Windows


at least it seems so. Although I'm a newbie to crytpo, so I'm not
sure.

The actual goal is to write DES decryption code in C to run on a 16
bit micro controller with no OS. This controller will then decrypt
messages encrypted by the Win/DOS exe. I don't have src code to the
Win/Dos exe but know it's doing single DES in ECB mode.

I have working controller code that encrypts and decrypts messages but
I can't decrypt a message encrypted by the Windows/DOS tool.
Furthermore, I wrote a test program under Linux, to make use of the
ecb_crypt() DES library call, but neither my code or the Win/DOS tool
agree with the Linux version. All three seem to encrypt and then
decrypt it's own, but just can't decrypt the other's encrypted data.
I just try on 64 bit plain text messages(like 0x0101010101010101) with
the same key.

So how can these 3 different encryption programs be correct but yet
disagree with each other(produce different cipher text)? From the
definition of DES in the FIPS Publication 46-3, Appendix 1 gives a
"recommended set" of selection functions.

Is it possible Windows and Linux libraries use different selection(S-
Box) functions? Which are both different from what is defined in FIPS
Publication 46-3? But I did google searches and didn't see anyone
else with this problem. I'm confused.

Any feedback would be appreciated!
Thanks,
Dan

.

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