pubkey

README

Pubkey

Extract public key from SSH private key.

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Let’s suppose that you’ve accidentally rm’ed your ~/.ssh/id_ed25519.pub file. Don‘t panic, ssh would still work because private key file contains public key. And if you need to recover .pub file, you’ve found the right tool.

Usage

All flags are optional. The input file -f flag defaults to $HOME/.ssh/id_rsa, or /etc/ssh/ssh_host_rsa_key if $HOME is not set. Empty input file path implies standard input. The public key is written to standard output if output file flag -o is not specified. Chmod-style permissions for output file may be specified using -c flag.

• Write the public key of id_ed25519 identity to the id_ed25519.pub file.

  pubkey -f ~/.ssh/id_ed25519 -o ~/.ssh/id_ed25519.pub -c u=r,g=r
  

• You can also pipe your private key through cat without exposing file descriptors to pubkey.

  < ~/.ssh/id_ed25519 cat | pubkey -f= | cat > ~/.ssh/id_ed25519.pub