[CentOS] modprobe :: not finding existing .ko

Hi! I try to load an module that it is found in curent
/lib/modules/`uname -r` tree ...
root at sevcenco: ~ # ls -l /lib/modules/`uname 
-r`/kernel/drivers/crypto/padlock-*
-rwxr--r-- 1 root root 14296 Mar 16 19:37 
/lib/modules/2.6.38-0.el5.elrepo/kernel/drivers/crypto/padlock-aes.ko
-rwxr--r-- 1 root root 10808 Mar 16 19:37 
/lib/modules/2.6.38-0.el5.elrepo/kernel/drivers/crypto/padlock-sha.ko

but if i try :
root at sevcenco: ~ # modprobe -v padlock-aes.ko
FATAL: Module padlock_aes.ko not found.

notice the change from - to _
Any idea about this?
or more abstract:
have anyone succeed to use padlock (via) hardware with openssl (or other 
software) in centos?

Thanks,
Adrian

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