There is a package called cryptopp where you can run most of the security algorithms freely and the source codes can also be downloaded. Once you know how to work with omnet++ you can use cryptopp in omnet++

Thank you so much@Pradeep kumar

can u please share how to import it on omnet++? i have followed these given steps but it did not work..

To add own libraries to an existing OMNeT++ project go to Project | Properties | OMNeT++ | Makemeke | select root or src directory | Options, then Custom | Makefrag and write the following lines:

EXTRA_OBJS += -LD:/foo/lib -lcryptopp CFLAGS += -ID:/foo/include