mirror of https://github.com/CrimsonTome/tldr.git
37 lines
1.0 KiB
Markdown
37 lines
1.0 KiB
Markdown
# ssh-keygen
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> Generate ssh keys used for authentication, password-less logins, and other things.
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> More information: <https://man.openbsd.org/ssh-keygen>.
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- Generate a key interactively:
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`ssh-keygen`
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- Generate an ed25519 key with 32 key derivation function rounds and save the key to a specific file:
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`ssh-keygen -t {{ed25519}} -a {{32}} -f {{~/.ssh/filename}}`
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- Generate an RSA 4096-bit key with email as a comment:
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`ssh-keygen -t {{rsa}} -b {{4096}} -C "{{comment|email}}"`
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- Remove the keys of a host from the known_hosts file (useful when a known host has a new key):
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`ssh-keygen -R {{remote_host}}`
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- Retrieve the fingerprint of a key in MD5 Hex:
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`ssh-keygen -l -E {{md5}} -f {{~/.ssh/filename}}`
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- Change the password of a key:
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`ssh-keygen -p -f {{~/.ssh/filename}}`
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- Change the type of the key format (for example from OPENSSH format to PEM), the file will be rewritten in-place:
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`ssh-keygen -p -N "" -m {{PEM}} -f {{~/.ssh/OpenSSH_private_key}}`
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- Retrieve public key from secret key:
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`ssh-keygen -y -f {{~/.ssh/OpenSSH_private_key}}`
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