keytool and private key

On a previous post I wrote

Could some one please post an example of a keytool creating a private key (and please explain what about the command makes the key private instead of public)

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I was given an excellent reply


there is no such command. you always generate a keypair, which generates both a private and a public key. the difference is that in the standard sun keytool, there is no way to extract the private key, you can merely export either a certificate or a CSR with the public key. 

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But this led me to wonder....   What if I need to export a private key.  How do I do it.  

Also, when I use the keytool to create a certificate, can I assume the certificate contains the public key ?

Thanks
Anthony LuciaAsked:
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becraigConnect With a Mentor Commented:
So the comment you got is correct.

Once you have the Key "Pair" public and private you can extract the "public key portion"

You can also export the private key for use with a system that will validate ssl communications.

But this led me to wonder....   What if I need to export a private key.  How do I do it.  
You can use several tools to do this including the mmc in microsoft windows, openssl commands among other things (it will be exported in pkcs / pfx format [password] protected])

Also, when I use the keytool to create a certificate, can I assume the certificate contains the public key ?
Yes once a certificate is created you will have a matching pair public / private since that is what drives the SSL certificate concept key pairs.
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Dave HoweSoftware and Hardware EngineerCommented:
easiest is the keytool iui gui tool
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