SFTP adapter - key based authentication. Server Public key needed?

Hi Experts,

Based on my understanding for SFTP key based authentication configuration is that we need to generate the private and public key in PI, then sends the public key to the SFTP vendor.

Generating SSH Keys for SFTP Adapters - Type 1 - Process Integration - SCN Wiki

Generating SSH Keys for SFTP Adapters - Type 2 - Process Integration - SCN Wiki

http://scn.sap.com/docs/DOC-31925

But, the SFTP vendor sent me their public key (in *.pub extension format). Do I need their public key to put/pick files from their SFTP server?

Regards,

Suwandi C.