keygen.c, crypto.h, crypto.c:
New files for cryptography support.

BKrev: 4117ecc6HWTXJ7DG7UZ3E01aKajTBA


git-svn-id: http://svn.fedorahosted.org/svn/corosync/trunk@158 fd59a12c-fef9-0310-b244-a6a79926bd2f