# wget http://downloads.openwrt.org/snapshots/trunk/ar71xx/packages/base/libopenssl_1.0.1i-1_ar71xx.ipk
# opkg install libopenssl_1.0.1i-1_ar71xx.ipk

e o resultado deve ser:

# opkg list-installed | grep openssl
libopenssl - 1.0.1h-1