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Decrypt Blowfish ECB

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Cross-platform protocol-independent communication framework for building peer-to-peer and client-server applications and middleware components.
#5939
Posted: 04/20/2008 12:05:55
by Denis Sletkov (Standard support level)
Joined: 11/27/2007
Posts: 14

I have data crypted with ECB Blowfish (128) with Lockbox library, when i want to decrypt this data using SecureBlackbox i can not retrive data, i use DecryptECB and TElBlowfishSymmetricCrypto.Decrypt with no sucess.
#5940
Posted: 04/20/2008 14:26:37
by Eugene Mayevski (EldoS Corp.)

The best approach would be the following:

1) create some code that would perform *encryption* using SecureBlackbox. Then use your current decryption code to decrypt the result of the above encryption (NOT your Lockbox data for now). If something doesn't work, post your code for encryption and decryption.
2) once we have the correctly working code for both encryption and decryption with SecureBlackbox, we will be able to move to Lockbox and the data encrypted with it..


Sincerely yours
Eugene Mayevski
#6090
Posted: 05/02/2008 17:10:20
by Denis Sletkov (Standard support level)
Joined: 11/27/2007
Posts: 14

Quote
If something doesn't work, post your code for encryption and decryption.

If i use sbb for decryption and encryption all work. I think problem in Lockbox block size which equal to 64.
#6092
Posted: 05/03/2008 05:07:48
by Mykola Olshevsky (Basic support level)
Joined: 07/07/2005
Posts: 450

Block size for blowfish is indeed 64 bits, so it cannot be the source of problem.
We compared lockbox Blowfish implementation and ours one, and it seems, that they use slight differ (or erroneus?) algorithm, and it produces different results even on key expansion step. Our implementation works fine with almost all others, so it should be a problem in lockbox library.
#6097
Posted: 05/03/2008 11:57:44
by Denis Sletkov (Standard support level)
Joined: 11/27/2007
Posts: 14

As i understand there no possibility to decrypt Lockbox data using sbb.
#6099
Posted: 05/03/2008 17:20:46
by Mykola Olshevsky (Basic support level)
Joined: 07/07/2005
Posts: 450

You're right, as they use modified blowfish algorithm or so.
Also by EldoS: CallbackRegistry
A component to monitor and control Windows registry access and create virtual registry keys.

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