Dnssec-keygen cade ?????

Oi galera, to tentando criar uma chave no CentOS e nao estou conseguindo nao, eu ate atualizei o CentOS mesmo assim nao consigo fazer o comando

dnssec-keygen -a HMAC-MD5 -b 128 -n USER chave

Apareci assim:

[root@localhost ~]# dnssec-keygen -a HMAC-MD5 -b 128 -n USER chave
bash: dnssec-keygen: command not found


Ai eu pensei em fazer isso, mais pareci que dar erro tambem

[root@localhost ~]# yum install bind* --skip-broken
Loaded plugins: fastestmirror
Existing lock /var/run/yum.pid: another copy is running as pid 2979.
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: pup
Memory : 37 M RSS (135 MB VSZ)
Started: Fri Sep 16 15:08:29 2011 - 26:37 ago
State : Sleeping, pid: 2979
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: pup
Memory : 37 M RSS (135 MB VSZ)
Started: Fri Sep 16 15:08:29 2011 - 26:39 ago
State : Sleeping, pid: 2979
Another app is currently holding the yum lock; waiting for it to exit...
The other application is: pup
Memory : 37 M RSS (135 MB VSZ)
Started: Fri Sep 16 15:08:29 2011 - 26:41 ago
State : Sleeping, pid: 2979


Exiting on user cancel.
[root@localhost ~]#


Alguem pode me ajudar ??? Eu to precisando usar o comando dnssec

Obrigado