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Daniel

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Daniel last won the day on December 13 2021

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  • Delphi-Version
    Delphi 10.4 Sydney

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  1. Daniel

    Survey of Delphi Versions in use??

    There is no specific area for polls like this. "Offtopic" might be an option.
  2. Daniel

    Delphi 11.1 is available

    No, the link to the download- portal is fine. there was a deep-link to the ISO-file that I have removed.
  3. Daniel

    Delphi 11.1 is available

    Folks, please try to avoid posting the direct download links. Although these are not hard to guess, in the past there have been requests from Embarcadero not to publish the links.
  4. Thanks - it is now on my ToDo-List.
  5. I agree with you that one should be careful what information one posts about oneself. In this particular case, however, I do not feel that I have published sensitive or new data. My real name is known and I do not make a secret of the fact that I have been vaccinated. In none of the screenshots published so far was there enough information to allow misuse of the certificates - and that is of course good and right (and should stay that way).
  6. Thanks for the support - I am a step further. Actually OpenSSL handles all these algorithm-stuff by itself. It was just my code that was writing a superfluous zero-byte to a stream. And when it comes to cryptography, a single byte can destroy everything. ๐Ÿ˜‰
  7. Thanks. Yes, this is the case for all certificates using the algorithm "ECDSA w/ SHA256" for the signature. So far I only can verify the certificates using the algorithm "RSASSA-PSS". This is a little bit tricky right now...
  8. Daniel

    Problems with email confirmation

    No known problems. I just got some emails from this forum. @AlanScottAgain Please be so kind and send me a personal message containig the email-address you want to use - and I will clean up the previous accounts.
  9. I did not expect this - but sometimes reading the manual (aka specification) indeed helps. Hardcoding the algorithm SHA-256 while the certificates could also use SHA-384 or SHA-512 is not helpful either. I suspect that the failed examples here failed at this very point. May I ask you both to take another look at the updated code (see first post). I assume that you will see another algorithm used than "SHA-256".
  10. Thanks - I nailed it down to the code that generates the digital signature. I am still looking for a health-certificate around me that generates this error. It is a lot easier, having one of them inside the IDE....
  11. Interesting - thanks for the feedback. Most likely the program calculated the wrong signature to compare against the signature provided in the certificate. hm. Next week I will have access to more certificates to test with.
  12. Well, this is a private research-project about the EU Covid-certificates. I wanted to know how that stuff works and how the pieces are glued together. After a wild mixture of very interesting and also some nasty hours, I got it working. I also learned about new data formats that were previously unknown to me (hello "cbor"). Many different techniques come together here: decoding the data from Base45 (yes, forty-five) decompressing the result using the zlib-classes downloading external supplementary files using the http-components hopping from the formats "COSE" to "CBOR" to "JSON" using OpenSSL to extract and validate the digital signature against the official public keys All of this is now integrated in a small and fluffy Delphi program. This client reads the personal/medical data from the certificate displays the specific information for "vaccinated"-certificates "tested"-certificates "recovered"-certificates reads the digital signature from the certificate verifys that signature using the public keys from the official trust-list to detect fraud is clearly not an official application ready for production use anywhere Important: Some, but not all code ist from me. The unit "cbor.pas" comes from "https://github.com/mikerabat/DelphiCBOR", the interface to openssl comes from "https://github.com/Arvur/OpenSSL-Delphi". Just in case you're interested and want to try it: Download attached zip-archive. It contains the complete Delphi-project as well as the value-sets and trust-list (see #3). You need to get your hands on the openssl-libraries "libeay32.dll" and "ssleay32.dll" (not included in the downloads). These libraries must be located in the same directory as the executable. By default "Win32-Debug" is the output-path for this project. If you decide to switch to 64bit, you should provide the matching libraries. This program reads the trust-list and the so-called value-sets from external json-files. These files can be downloaded using the button "Download supplementary data" (button starts download, gives no feedback, you must restart the program afterwards). The trust-list contains the list of currently valid public-certificates. The value-sets contain the translations from IDs (values) to readable strings. All the json-files must be in the same directory as the executable - and that directory must be writable. The json-files from today are included in the download. You need - of course - an EU Covid-19 health certificate (vaccinated, tested or recovered). Take any barcode-scanner to translate the barcode into textual representation: You should get a string starting with "HC1:". Paste that code into the windows that opened after pressing "Scan certificate". CovDemo_06-Feb-2022.zip
  13. Daniel

    DP not reliably approving new users?

    Well - that mistake was clearly not a highlight. *sigh* It was never the intention to approve the accounts manually, so I never expected to find a queue of accounts in that area of the admin-panel of this software. Something like this shouldn't happen - I'm honestly contrite. Maybe a free beer to everyone? ๐Ÿ˜‰
  14. Daniel

    wuppdi Welcome Page for Delphi 11 Alexandria?

    The code itself works - at the moment it's the adaption to the high-dpi settings. I gave the whole project to another MVP, I will ask about the progress. Well ... I prefer not to talk about this in public. I hope for your understanding.
  15. Folks - why is it that hard to stay on topic? honestly, it is not hard. You just donโ€˜t care. Feel free to create a separate thread for cross-platform development, but this topic is locked now.
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