CreateMockAESGCMKeyHandle is a utility function that returns a mock key (for tests only, not registered in Tink).

CreateMockED25519KeyHandle is a utility function that returns a mock key (for tests only, not registered in Tink).

NewProviderForKMS creates a new mock Provider to create a KMS.

KeyManager mocks a local Key Management Service + ExportableKeyManager.

Provider provides mock Provider implementation.