query on files under /etc/raddb/certs

[SIMON BABY]

Hello,

I see the files below are generated under /etc/raddb/certs directory. Can
someone  explain to me the usage of these files? Our system is very secure
and did not want to create certs and keys dynamically.
-rw-r--r-- 1 root 0 4393 Nov  5 18:47 01.pem
-rw-r--r-- 1 root 0 4370 Nov  5 18:47 02.pem
-rw-r----- 1 root 0 6155 Nov  5 18:42 Makefile
-rw-r----- 1 root 0 8714 Nov  5 18:42 README
-rwxr-x--- 1 root 0 2706 Nov  5 18:47 bootstrap
-rw-r----- 1 root 0 1432 Nov  5 18:42 ca.cnf
-rw-r--r-- 1 root 0 1256 Nov  5 18:47 ca.der
-rw-r--r-- 1 root 0 1751 Nov  5 18:47 ca.key
-rw-r--r-- 1 root 0 1757 Nov  5 18:47 ca.pem
-rw-r----- 1 root 0 1103 Nov  5 18:42 client.cnf
-rw-r--r-- 1 root 0 4370 Nov  5 18:47 client.crt
-rw-r--r-- 1 root 0 1045 Nov  5 18:47 client.csr
-rw-r--r-- 1 root 0 1743 Nov  5 18:47 client.key
-rw-r--r-- 1 root 0 2581 Nov  5 18:47 client.p12
-rw-r--r-- 1 root 0 3545 Nov  5 18:47 client.pem
-rw-r--r-- 1 root 0  424 Nov  5 18:47 dh
-rw-r--r-- 1 root 0  229 Nov  5 18:47 index.txt
-rw-r--r-- 1 root 0   21 Nov  5 18:47 index.txt.attr
-rw-r--r-- 1 root 0   21 Nov  5 18:47 index.txt.attr.old
-rw-r--r-- 1 root 0  120 Nov  5 18:47 index.txt.old
-rw-r----- 1 root 0 1131 Nov  5 18:42 inner-server.cnf
-rw-r--r-- 1 root 0  166 Nov  5 18:42 passwords.mk
-rw-r--r-- 1 root 0    3 Nov  5 18:47 serial
-rw-r--r-- 1 root 0    3 Nov  5 18:47 serial.old
-rw-r----- 1 root 0 1125 Nov  5 18:42 server.cnf
-rw-r--r-- 1 root 0 4393 Nov  5 18:47 server.crt
-rw-r--r-- 1 root 0 1062 Nov  5 18:47 server.csr
-rw-r--r-- 1 root 0 1751 Nov  5 18:47 server.key
-rw-r--r-- 1 root 0 2589 Nov  5 18:47 server.p12
-rw-r--r-- 1 root 0 3576 Nov  5 18:47 server.pem
-rw-r--r-- 1 root 0 3545 Nov  5 18:47 user at example.org.pem
-rw-r----- 1 root 0  708 Nov  5 18:42 xpextensions

Regards
Simon