How to securely store keys in AndroidKeyStore using a password?

php editor Baicao brings you a guide on how to securely store keys in AndroidKeyStore using passwords. In mobile app development, protecting the security of your keys is crucial. AndroidKeyStore provides a reliable way to store keys to ensure that they cannot be obtained by malicious applications or attackers. This guide will explain how to use a password to encrypt a key and securely store it in the AndroidKeyStore to provide the highest level of security. Whether you're a newbie or an experienced developer, you can easily follow this step-by-step guide to achieve this goal. let's start!

Question content

I'm trying to create an application that allows users to store passwords. Now, I allow users to encrypt their passwords in two ways, the first is biometric and the other is password

I was able to achieve biometrics encryption by creating the key in the AndroidKeyStore and setting setUsetAuthenticationRequired(true) when creating the key, and then authorizing the password using the BiometricsManager.

However, I'm not sure how to implement password one. I tried looking for PBE encryption but there isn't much in the Android documentation. What is the safest and best solution for this situation? If there are any links for the same I would be grateful :)

(Note: If I use PBE encryption and store the encrypted data (multiple usernames and passwords) in RoomDB, how can I I check the next time the application runs that the password is correct and there is nothing in the database to decrypt and test)

I also found a way to create a key, then store the key as an entry and use https://developer.android.com/reference/java/security/KeyStore.PasswordProtection to protect the entry. Let me know if this is a secure enough solution or if there is a better solution.

Thanks!

Workaround

If you want to store passwords in Room, you need to run a hash function and then store the hash of the password. No matter how long your password is, the hash value is a fixed size.

To compare the input password with the password stored in the database, you hash the input and compare it to the hash value stored in the database. Because if you apply a hash function to the same string, you'll get the same result. If there is at least 1 symbol wrong - the generated hash will be completely different.

You can check this and use the PBKDF2 algorithm. More details on how to choose a hash function and what not to use can be found here

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