ssh鍵のfingerprintの確認方法

SSH 鍵の fingerprint は以下のコマンドで確認できます。

ssh-keygen -l -f ~/.ssh/id_rsa

MD5 fingerprint を表示したい場合は -E オプションで指定します。デフォルトは sha256 です。

ssh-keygen -l -f ~/.ssh/id_rsa -E md5

コマンドの説明

man ssh-keygen コマンドを参照。

man ssh-keygen

SYNOPSIS
    ssh-keygen -l [-v] [-E fingerprint_hash] [-f input_keyfile]

DESCRIPTION
    -l      Show fingerprint of specified public key file.
            For RSA and DSA keys ssh-keygen tries to find the matching public key file and prints its finger-print.
            If combined with -v, a visual ASCII art representation of the key is supplied with the fingerprint.

    -E fingerprint_hash
            Specifies the hash algorithm used when displaying key fingerprints.
            Valid options are: ``md5'' and ``sha256''.  The default is ``sha256''.

    -f filename
            Specifies the filename of the key file.