Encrypt program for RTP

Is there any encryption program available for RTP platform? I’ve found an
UNIX-compatible encryption program “MCRYPT” but is unable to compile in RTP
due to unknown reasons. (suspected prob: libmhash not found even if it’s in
the LD_LIBRARY_PATH)
Is there any similiar encryption programs around? I need the program to
encrypt textfiles containing sensitive informations.
I’m using the latest Patch B RTP release on my machine.