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Commit 34945b1f authored by Eric Biggers's avatar Eric Biggers
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AndroidKeyStore: support platform use of rollback-resistant keys

The keystore2 binder API supports rollback resistance when KeyMint
supports it, but until now this wasn't exposed to Java code that uses
AndroidKeyStore.  Add support for rollback-resistant keys to
KeyProtection and AndroidKeyStoreSpi.setSecretKeyEntry() so that
LockSettingsService can request it for SP protector keys.

This CL does *not* do any of the following:

- Add any non-hidden APIs.  KeyMint implementations only support a
  limited number of rollback-resistant keys; currently the available
  space is reserved for platform use only.  Note that other examples of
  "hidden", platform-only key properties are
  isCriticalToDeviceEncryption() and getBoundToSpecificSecureUserId().

- Support rollback resistance with keys directly generated by Keystore.
  This isn't currently needed.  Note that this would require changes
  KeyGenParameterSpec and AndroidKeyStoreKeyGeneratorSpi.

- Allow querying the rollback resistance property of keys.  This isn't
  currently needed.  Note that this would require changes to KeyInfo and
  AndroidKeyStoreSecretKeyFactorySpi.

Bug: 239632930
Test: see I05f3b7e5c139471febe5c266a39e3dc3bca4831f
Change-Id: Ifcfd0b8f1bf440ef1ac80a9ac2b0e9c7f62106dd
parent cd671e38
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