mcrypt_enc_self_test Runs a self test on the opened module &warn.deprecated.function-7-1-0.removed-7-2-0; &reftitle.description; intmcrypt_enc_self_test resourcetd This function runs the self test on the algorithm specified by the descriptor td. &reftitle.parameters; td The encryption descriptor. &reftitle.returnvalues; Returns 0 on success and a negative &integer; on failure.