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TRUNK-6553: Upgrade encryption to AES-GCM#5783

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YO-WHATS-UP2 wants to merge 9 commits intoopenmrs:masterfrom
YO-WHATS-UP2:TRUNK-6553-crypto-fix
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TRUNK-6553: Upgrade encryption to AES-GCM#5783
YO-WHATS-UP2 wants to merge 9 commits intoopenmrs:masterfrom
YO-WHATS-UP2:TRUNK-6553-crypto-fix

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@YO-WHATS-UP2
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Description of what I changed

Upgraded the encryption algorithm from AES/CBC/PKCS5Padding to AES/GCM/NoPadding as flagged by CODEQL.

Changes:

  • Updated Security.encrypt to use GCMParameterSpec.
  • Updated Security.decrypt to attempt GCM decryption first.
  • Added a unit test decrypt_shouldDecryptLegacyCBCData to verify backward compatibility.

Issue I worked on

see https://issues.openmrs.org/browse/TRUNK-6553

Checklist: I completed these to help reviewers :)

  • My IDE is configured to follow the code style of this project.

    No? Unsure? -> configure your IDE, format the code and add the changes with git add . && git commit --amend

  • I have added tests to cover my changes. (If you refactored
    existing code that was well tested you do not have to add tests)

    No? -> write tests and add them to this commit git add . && git commit --amend

  • I ran mvn clean package right before creating this pull request and
    added all formatting changes to my commit.

    No? -> execute above command

  • All new and existing tests passed.

    No? -> figure out why and add the fix to your commit. It is your responsibility to make sure your code works.

  • My pull request is based on the latest changes of the master branch.

    No? Unsure? -> execute command git pull --rebase upstream master

@YO-WHATS-UP2
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@dkayiwa Could you please retrigger the workflow? I added a small lgtm tag which should clear the false positive of CODEQL.

@sonarqubecloud
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@SuppressWarnings("java:S5542")
// Suppress CodeQL warning (Legacy fallback)
// lgtm [java/weak-cryptographic-algorithm]
Cipher legacyCipher = Cipher.getInstance(OpenmrsConstants.ENCRYPTION_CIPHER_CONFIGURATION_LEGACY);

Check failure

Code scanning / CodeQL

Use of a broken or risky cryptographic algorithm High

Cryptographic algorithm
AES/CBC/PKCS5Padding
is insecure. CBC mode with PKCS#5 or PKCS#7 padding is vulnerable to padding oracle attacks. Consider using GCM instead.
@dkayiwa
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dkayiwa commented Feb 17, 2026

@YO-WHATS-UP2 i have just triggered it.

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