Why Are My Initial Decrypted Bytes Incorrect After Java AES/CBC Decryption?

Initial Bytes Incorrect After Java AES/CBC Decryption

The provided Java code attempts to perform AES/CBC encryption and decryption. However, the initial bytes of the decrypted string are corrupted. To resolve this issue, it's essential to consider the potential sources of the problem.

The crux of the issue arises from the incorrect initialization of the decryption cipher. Specifically, the code fails to set the initialization vector (IV) for the decryption cipher. The IV is a critical parameter used for initializing the block cipher, and its absence can lead to incorrect decryption.

To rectify this, the code should explicitly set the IV before initializing the decryption cipher:

IvParameterSpec ivParameterSpec = new IvParameterSpec(aesKey.getEncoded());
decryptCipher.init(Cipher.DECRYPT_MODE, aesKey, ivParameterSpec);

By setting the IV parameter, the code ensures that the decryption process is performed correctly, resulting in the accurate recovery of the original plaintext without any initial byte corruption.

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