Created
November 13, 2013 03:16
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Code snippet providing pre-4.4 compatibility for Android apps using SecretKeyFactory with PBKDF2WithSHA1.
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| import android.os.Build; | |
| SecretKeyFactory factory; | |
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { | |
| // Use compatibility key factory -- only uses lower 8-bits of passphrase chars | |
| factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1And8bit"); | |
| Log.i(TAG, "Selected KITKAT key factory"); | |
| } else { | |
| // Traditional key factory. Will use lower 8-bits of passphrase chars on older | |
| // devices, and all available bits on KitKat (or newer) devices. | |
| factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1"); | |
| Log.i(TAG, "Selected LEGACY key factory"); | |
| } |
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May that result in different keys generated on different devices/Android versions? If yes, there'll be trouble when users install an application prior to KitKat and then upgrade their device.