Re: Calculation of a DH secret key
From: tlviewer (tlviewer_at_yahoo.com)
Date: 06/30/04
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Date: Tue, 29 Jun 2004 19:15:10 -0700
Nick wrote:
> While using MS DSS and DH CSP for calculation of a DH secret key I've obtained the following results.
>
> AlgId of imported BLOB AlgId of hPubKey Result
>
> AT_KEYEXCHANGE AT_SIGNATURE false (error 0x80090003 "Bad Key")
> AT_KEYEXCHANGE AT_KEYEXCHANGE true
> AT_SIGNATURE AT_SIGNATURE true
> AT_SIGNATURE AT_KEYEXCHANGE true
>
> Is there anyone who can answer me the following question:
> Why does the calculation fail for the first case?
>
> Please note that obtained results do not depend on a version of the imported BLOB.
>
> Thanks,
>
> Nick
Here is an open invitation to anyone that wants to
negotiate a DH key exchange in this thread.
(All numbers are in hex)
len: 512 bits
-----------
prime =e7e98389fb552dec573f8f16719ecb1330c9ef725e86493df2a0bf6074656db1
ab2da5d34b34338033a619901b9952d8cf47c144be55c01a3071e8ab74686bdd
gen =bdc9022a154bbc6dcc205612736966b2902c3866616e3ee0f9e6b6ecf7333b1a
eb8a044c2da2f022c180558e34425455ed74c5c8fb242aa454a22d0d23dbeb59
y_pbk =65c79e8fda7686e573dbba7a57d298ce44225a3f34f1f142a4ad9d301da8febd
d1e1e8e2b2a58ce1a67b769794d12699544142de565a7f340eb9adbab7708ea8
I have saved my X value (random exponent). I have computed the above
using the CryptoAPI.
Import my (prime, gen) pair, get your KP_X, then import my
y_pbk and export your y_pbk. Finish the calculation by hashing the
session key. This will reflect the value of the shared secret (use SHA).
Post your y_pbk here so I can complete my calculation of the shared
secret. I will process multiple posts if need be. Each poster will
arrive at a unique shared secret in partnership with the triplet posted
above.
Crypto anyone?
regards,
tlviewer
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