How to add an encryption algorithm in the FreeBSD Kernel?

Question

I am trying to add my own cipher to the FreeBSD kernel. I searched online but couldn't really find help. I am wondering which files should i modify to link my new cipher and where to put my source code. Thanks

Answer 1

See crypto(9). Most of the algorithms are found in /usr/src/sys/crypto/. Some algorithms and the cryptograhic framework code are in /usr/src/sys/opencrypto/.

Answer 2

Take a look at sys/opencrypto/, in particular sys/opencrypto/xform.c, to see how various algorithms are integrated with the rest of the kernel.