AES256 Decrypt with PrivateKey (Certificate)

[jindrichvolek]

Hello please, how to decrypt AES256 with PrivateKey (Certificate) Thx.

[lminuti]

You can see the code here: https://github.com/lminuti/Delphi-OpenSSL#encrypt-with-aes256 But AES256 is a symmetric algorithm, it uses a key and an initialization vector to encode the data not a certificate. DelphiOpenSSL has a special record (TPassphrase) that can generate key and IV from a string.

[jindrichvolek]

Hello thx for answer. I receive some encrypted data from goverment institution. As descripted - they are encrypted aes256 with public qualified certificate: <Data contentEncoding="base64" compression="gzip" encryptionAlgorithm="aes256">UZI5445..............</Data> and I don’t know, how it decrypted... J.Volek From: Luca Minuti Sent: Monday, January 20, 2020 9:10 AM To: lminuti/Delphi-OpenSSL Cc: jindrichvolek ; Author Subject: Re: [lminuti/Delphi-OpenSSL] AES256 Decrypt with PrivateKey (Certificate) (#5)

You can see the code here: https://github.com/lminuti/Delphi-OpenSSL#encrypt-with-aes256 But AES256 is a symmetric algorithm, it uses a key and an initialization vector to encode the data not a certificate. DelphiOpenSSL has a special record (TPassphrase) that can generate key and IV from a string.

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[lminuti]

I'm sorry but I never use AES with certificate. You can try to inspect the certificate with something like: openssl x509 -in your_cerificate -text and try to extract the key.