Re-using embedded resources for implementing built-in self test mechanisms allows test cost reduction. In this paper we demonstrate how to implement cost-efficient built-in self test functions from the AES cryptoalgorithm hardware implementation in a secure system. Self-test of the proposed implementation is also presented. A statistical test suite and fault-simulation are used for evaluating the efficiency of the corresponding cryptocore as pseudo-random test pattern generator; an analytical approach demonstrates the low probability of aliasing when used for test response compaction.