[Question] Private key for CSR

[longntv]

Hello Everyone,

I'm using TPM2 to generate CSR as described in wiki.
After get certificate which signed by server side, in my case, I have to use private key used for CSR generation to handshake with SSL connection with server. I tried to convert key.priv using base64 command but failed.
And could you please support me to explain below questions:

1. Can I use private key "key.priv" when created private key in TPM
   tpm2_create -c po.ctx -g sha256 -G rsa -u key.pub -r key.priv
2. If question 1 is no, which private key will be accepted?
3. What are key.pub and key.priv used for?

Thank you very much.