Generate Fingerprint From Private Key

New keys with OpenSSH private key format can be converted using ssh-keygen utility to the old PEM format. Ssh-keygen -p -m PEM -f /.ssh/idrsa There is no need to downgrade to older OpenSSH just to achieve this result. The -l option instructs to show the fingerprint in the public key while the -f option specifies the file of the key to list the fingerprint for. To generate the missing public key again from the private key, the following command will generate the public key of the private key provided with the -f option.

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How to Generate a Public/Private KeyPair for Use With Solaris Secure Shell

Users must generate a public/private key pair when their site implementshost-based authentication or user public-key authentication. For additionaloptions, see the ssh-keygen(1) manpage.

Before You Begin

Determine from your system administrator if host-based authenticationis configured.

Start the key generation program.

where -t is the type of algorithm, one of rsa, dsa, or rsa1.
Specify the path to the file that will hold the key.
Bydefault, the file name id_rsa, which represents an RSAv2 key, appears in parentheses. You can select this file by pressing the Return key. Or, you can type an alternative file name.
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The file name of the public key is created automatically by appendingthe string .pub to the name of the private key file.
Type a passphrase for using your key.
This passphraseis used for encrypting your private key. A null entry is stronglydiscouraged. Note that the passphrase is not displayed when youtype it in.
Retype the passphrase to confirm it.
Check the results.
Check that the path to the keyfile is correct.

At this point, you have created a public/private key pair.
Choose the appropriate option:
- If your administrator has configuredhost-based authentication, you might need to copy the local host's publickey to the remote host.
  You can now log in to the remote host.For details, see How to Log In to a Remote Host With Solaris Secure Shell.
  1. Type the command on one line with no backslash.
  2. When you are prompted, supply your login password.
- If your site uses user authentication with public keys, populateyour authorized_keys file on the remote host.
  1. Copy your public key to the remote host.
    Type thecommand on one line with no backslash.
  2. When you are prompted, supply your login password.
    Whenthe file is copied, the message “Key copied” is displayed.
(Optional) Reduce the prompting for passphrases.
For a procedure, see How to Reduce Password Prompts in Solaris Secure Shell. Kalium private key not generating. For more information, see the ssh-agent(1) and ssh-add(1) man pages.

Example 19–2 Establishing a v1 RSA Key for a User

In the following example, the user cancontact hosts that run v1 of the Solaris Secure Shell protocol. To be authenticated by v1hosts, the user creates a v1 key, then copies the public key portion to theremote host.

A lost SSH public-key or a web service generates an SSH key but does not provide the public-key part to you. What to do now? There is a solution for this situation.

When you have an SSH key you need the public key to setup SSH passwordless login with SSH-key. But if you have lost the public key part but still have the private key, there is a way to regenerate the key.

With the public key missing, the following command will show you that there is no public key for this SSH key.

The -l option instructs to show the fingerprint in the public key while the -f option specifies the file of the key to list the fingerprint for.

To generate the missing public key again from the private key, the following command will generate the public key of the private key provided with the -f option.

How To Generate Fingerprint From Public Key

The -y option will read a private SSH key file and prints an SSH public key to stdout. The public key part is redirected to the file with the same name as the private key but with the .pub file extension. If the key has a password set, the password will be required to generate the public key.

To check the details of the generated public key execute the following command as shown above.

The output of this command shows the key size as the first column, the fingerprint as the second column and after the file name, the type is shown in brackets. In the example above, a 4096 bit RSA key.