perf: centralized and memoized AES-256-GCM cryptographic helper library (#51)

[prakshithamalla-art]

Closes #51

🎯 Overview & Motivation

The processing workflows for runtime secrets and application credentials relied on scattered local crypto instances or lacked clear key error verification bounds. This resulted in redundant memory allocation during heavy sandbox synchronization loops.

This PR centralizes the application's cryptographic infrastructure inside a singular utility file (lib/crypto.ts) using high-performance symmetric aes-256-gcm algorithms, while adding dynamic allocation caching for the key buffers.

🛠️ Changes Implemented

• Created a shared cryptographic driver utility at lib/crypto.ts.
• Implemented cachedKeyBuffer memoization variables to eliminate repetitive Buffer.from string evaluations on hot execution paths.
• Formulated a standard serialization layout format (iv:authTag:encryptedData) with strict runtime validations for ENCRYPTION_KEY availability.
• Added strict, secure catch boundaries to prevent processing failures from silently leaking or destabilizing deployment routers.

[vercel]

@prakshithamalla-art is attempting to deploy a commit to the Deekshith Gowda HS's projects Team on Vercel.

A member of the Team first needs to authorize it.

[coderabbitai]

Warning

Review limit reached

@prakshithamalla-art, we couldn't start this review because you've reached your PR review rate limit.

More reviews will be available in 45 minutes and 17 seconds. Learn how PR review limits work.

Your organization has run out of usage credits. Purchase more in the billing tab.

⌛ How to resolve this issue?

After more reviews become available, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans include higher PR review limits than trial, open-source, and free plans. In all cases, reviews become available again over time. During sustained high-volume PR review activity, CodeRabbit may temporarily slow when the next review becomes available.

Please see our Fair Usage Limits Policy for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 0460c7a9-aa2b-44e9-aaad-e7f5346d7252

📥 Commits

Reviewing files that changed from the base of the PR and between d96a51d and c6c8941.

📒 Files selected for processing (1)

• lib/crypto.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}