feat: Added Integrity Verification Through HMAC - Githubissues

Vikranth3140 / Encryption-Decryption-Tool

This Python tool provides a flexible way to encrypt and decrypt files using Stored Key Method and Password-Based Key Derivation.

MIT License

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feat: Added Integrity Verification Through HMAC #11

Closed ARYPROGRAMMER closed 4 days ago

ARYPROGRAMMER commented 5 days ago

This PR Resolves the Issue#6

We incorporate HMAC Function from cryptography.hazmat.primitives to compute and verify the HMAC.
After encrypting the file, we will compute the HMAC of the encrypted content using the same key, and append it to the output file.
Before decrypting, we will extract the HMAC from the encrypted file and verify it against the encrypted content to ensure data integrity.
For Debugging Purposes the HMAC keys are getting printed on the terminal.

Major Changes :

HMAC Generation (generate_hmac): An HMAC is created for the encrypted data using the encryption key.
HMAC Verification (verify_hmac): During decryption, the HMAC of the encrypted content is compared with the stored HMAC to verify the file's integrity.
File Structure:
- When using password-based encryption, the salt is stored at the beginning of the file.
- The encrypted content is followed by the HMAC, ensuring integrity.

With this feature, the script not only encrypts and decrypts files but also ensures that the data hasn’t been modified or tampered with during transmission or storage.

Vikranth3140 commented 4 days ago

Hey @ARYPROGRAMMER,

Thanks for the PR for #6. I have reviewed the PR and requested changes, please do the needful and revert back.