Decrypting Strings in Node.js: A Guide for PHP AES-128-CBC Users

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The Problem

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However, you encounter errors stating "wrong final block length" or "Invalid initialization vector", which makes it clear that something isn't quite right.

Understanding the Issues

The errors you are facing typically arise from two main issues related to the initialization vector (IV) and the way strings are being passed to the decryption function:

Initialization Vector (IV):

In AES-CBC mode, you require an IV to ensure that identical plaintexts encrypt to different ciphertexts.

By default, if you don’t specify an IV in your PHP code, it uses an empty string.

Encoding:

1. Defining the Key and IV

2. Modifying the Decryption Code

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3. Key Points to Remember

Key Size: Ensure that the key is exactly 16 bytes for AES-128.

Initialization Vector: For AES-128-CBC, always use a buffer for the IV, even when it is empty.

Encoding: Make sure your encrypted data is encoded in base64 before transmission.

Conclusion

If you encounter any issues, make sure to double-check your key size, IV settings, and encoding formats. Happy coding!