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https://issues.apache.org/jira/browse/SPARK-43286?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Gekk resolved SPARK-43286.
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Fix Version/s: 3.5.0
Resolution: Fixed
Issue resolved by pull request 40969
[https://github.com/apache/spark/pull/40969]
> Update CBC mode in aes_encrypt()/aes_decrypt() to not use KDF
> -------------------------------------------------------------
>
> Key: SPARK-43286
> URL: https://issues.apache.org/jira/browse/SPARK-43286
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.5.0
> Reporter: Steve Weis
> Assignee: Steve Weis
> Priority: Major
> Fix For: 3.5.0
>
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> The current implementation of AES-CBC mode called via `{{{}aes_encrypt{}}}`
> and `{{{}aes_decrypt{}}}` uses a key derivation function (KDF) based on
> OpenSSL's
> [EVP_BytesToKey|https://www.openssl.org/docs/man3.0/man3/EVP_BytesToKey.html].
> This is intended for generating keys based on passwords and OpenSSL's
> documents discourage its use: _"Newer applications should use a more modern
> algorithm"._
> `{{{}aes_encrypt{}}}` and `{{{}aes_decrypt{}}}` should use the key directly
> in CBC mode, as it does for both GCM and ECB mode. The output should then be
> the initialization vector (IV) prepended to the ciphertext – as is done with
> GCM mode:
> {{(16-byte randomly generated IV | AES-CBC encrypted ciphertext)}}
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