You need to download, maybe compile if there aren't any binaries for your system and install OpenSSL.
ssh, scp, sftp, sshd, ssh-add, ssh-agent, ssh-keygen and sftp-server are all part of the OpenSSH (or SSH, if you prefer) suite, so download, compile if it's the source distribution, and install OpenSSH.
Step-by-step instructions (if you download the source distribution):
1. tar xzf open[ssh|ssl]*.tar.gz
2. cd open[ssh|ssl]*
5. make install
Make sure you install OpenSSL first.