This is xnu-8019. See this file in:
Directory listing for xnu-8019//osfmk/corecrypto
cc_abort.c
cc_clear.c
cc_cmp_safe.c
ccdigest_final_64be.c
ccdigest_init.c
ccdigest_internal.h
ccdigest_update.c
ccdrbg_nisthmac.c
cchmac.c
cchmac_final.c
cchmac_init.c
cchmac_update.c
ccsha256_K.c
ccsha256_di.c
ccsha256_initial_state.c
ccsha256_ltc_compress.c
ccsha256_ltc_di.c
ccsha2_internal.h