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Asked: 2026-06-10T06:57:45+00:00

My Delphi application uses TurboPower LockBox 3 to encrypt a plaintext information using AES

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My Delphi application uses TurboPower LockBox 3 to encrypt a plaintext information using AES 256. I now want to decrypt this information using PHP.
But TurboPower LockBox 3 has some interoperability issues.

Please check the post by LockBox 3 author here for details :

http://lockbox.seanbdurkin.id.au/tiki-view_forum_thread.php?comments_parentId=363&topics_offset=1

And a similar post on Stackoverflow

Secure keypair encryption solution in Delphi & PHP?

In LockBox 3, during encryption, you set a password. This password is then used as a seed to generate the key and iv. So has anyone been able to mimic the key generation method on PHP side ? Or is there any way i can get the Key/IV being generated by LockBox 3 and put it in my PHP code so the file can be decrypted ?

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1 Answer

  1. Editorial Team

    IV

    As stated to you before, the IV nonce is prepended to the ciphertext message. So to obtain it on the PHP side, simply extract the first 8 bytes.

    Keys

    You need to decide if the shared secret is in password-string format or binary key format. The symetric Key class (TSymetricKey) has a method SaveToStream(), which works as you would expect it to. The TCodec component has a Key property, which will be available after you set the cipher, chaining mode and password.

    All of the methods are self-documenting and do pretty much what they read like, however if you need some demo code, saving a key to a stream, let me know.

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