actually TOS8 will be based on currently maintained openwrt 23.05 where openssl 3.0 is used (current LTS version)
see https://downloads.openwrt.org/releases/23.05.5/packages/arm_cortex-a9_vfpv3-d16/base/libopenssl-afalg_3.0.15-1_arm_cortex-a9_vfpv3-d16.ipk