Issue while using Android fingerprint: IV required when decrypting. Use IvParameterSpec or AlgorithmParameters to provide it

Question

I\'m following the ConfirmCredential Android example provided by Google, but it only shows how to encrypt the data. When I try to decrypt it I get exception:

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Answer 1

I created an issue in the github project for the sample provided by google (link to the issue here). The response I got is that I must use the IV that was generated when the value was encrypted. (same as in the solution provided by @Qianqian)

cipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(encryptCipher.getIV()));
byte[] decryptedBytes = cipher.doFinal(encryptedBytes);

I created a sample application that shows how to do this. It is available on github, here.

Hope this is useful to someone.