Merge "Replace num_unique_guesses with num_failures" into main

    private static class RateLimiterState {

        /**

         * The number of failed attempts since the last correct guess, not counting attempts that

         * never reached the real credential check for a reason such as detection of a duplicate

         * wrong guess, too short, delay still remaining, etc.

         * The number of failed attempts since the last successful attempt, not counting attempts

         * that never reached the real credential check for a reason such as detection of a

         * duplicate wrong guess, credential too short, delay still remaining, etc.

         */

        public int numFailures;

        /** The number of duplicate wrong guesses since the last correct guess or reboot */

        /**

         * The number of the duplicate wrong guesses that have been detected since the last success

         * or reboot. Note that the ability to detect duplicate wrong guesses may vary from device

         * to device depending on whether the error codes returned by the hardware rate-limiter

         * clearly differentiate between wrong guesses and other errors.

         */

        public int numDuplicateWrongGuesses;

        /** The type of the LSKF, as a value of the stats CredentialType enum */

        FrameworkStatsLog.write(

                FrameworkStatsLog.LSKF_AUTHENTICATION_ATTEMPTED,

                /* success= */ success,

                /* num_unique_guesses= */ state.numFailures + (success ? 1 : 0),

                /* num_failures= */ state.numFailures,

                /* num_duplicate_guesses= */ state.numDuplicateWrongGuesses,

                /* credential_type= */ state.statsCredentialType,

                /* software_rate_limiter_enforcing= */ mEnforcing,