Rewriting Java AES 256 GCM Encryption in Node.js

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The Problem Overview

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The Existing Code in Java

The Java code utilizes the following components:

Secret Key and Salt: Anyone using the encryption needs to be aware of these values.

IV (Initialization Vector): A fixed vector is used, which is critical for the encryption process.

Cipher Creation: Java uses the Cipher class to perform encryption operations.

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What’s Missing?

Dynamic Salt and IV: Instead of using static values, we recommend generating random salt and IV for each encryption process, which enhances security.

Key Changes Required

To ensure both implementations yield the same output, follow these changes:

Correct the Concatenation Order:

Instead of this line:

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You should modify it to:

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Generate Random Salt and IV:

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Putting It All Together

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Conclusion

This approach not only ensures the integrity of your encryption but also adheres to best security practices. If you face further challenges, remember that encryption methods can vary slightly between implementations, so it’s always worth double-checking your results!