Generate SSH public/private keys on Windows.

generateSSHkeysOnWindows.md

File Formats for SSH Keys

There have been three file formats for SSH keys. According to PuTTY document, "SSH-2 private keys have no standard format."

• OpenSSH format
• PuTTY's native format(*.PPK)
• SECSH format, RFC4716

Tools

• ssh-keygen
  • "Git for Windows" contains it.
• PuTTYgen
  • "WinSCP(package version)" and "SourceTree for Windows" contain it.
• Tera Term

References

• SSHの秘密鍵について - 禿散らかしてごめんなさい (in Japanese)
• Generating SSH keys, GitHub Help

Appendix 1. Tips for SSH

###Convert SECSH(RFC4716) format to others This is quoted from http://qiita.com/marcie001/items/47a23cfeed00db783d39 (in Japanese).

$ ssh-keygen -i -f id_rsa.pub >> ~/.ssh/authorized_keys

###Identify a size of SSH key This is quoted from http://d.hatena.ne.jp/hnw/20140705 (in Japanese).

$ ssh-keygen -l -f $HOME/.ssh/id_rsa.pub

Use multiple SSH keys

This is quoted from http://d.hatena.ne.jp/MIZUNO/20080705/1215238138 (in Japanese).

$ ssh -i ~/.ssh/id_rsa.hoge hoge@fuga.com

The ssh command searchs SSH keys automatically if the SSH keys are set in ~/.ssh/config.

IdentityFile ~/.ssh/id_rsa
IdentityFile ~/.ssh/id_rsa.hoge
IdentityFile ~/.ssh/id_rsa.foo