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| C++ example code showing how to generate an RSA public/private key pair and export to PEM files.
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Many Git servers authenticate using SSH public keys. In order to provide a public key, each user in your system must generate one if they don’t already have one. This process is similar across all operating systems. First, you should check to make sure you don’t already have a key. I think you are mixing things up. AES is a symmetric cipher, thus only have one key both for encryption and decryption. Asymmetric ciphers like RSA have two keys. A public key for encryption and a private key for decryption. And for reddit, you can indeed answer without being logged in.
C Generate Public Private Key Pair
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How to Create a Public/Private Key Pair
Generate A Public Key
The standard procedure for creating a Secure Shell public/private key pair follows. For information on additional options, see ssh-keygen(1).
C Generate Public Private Key Encryption
- Start the key generation program.
- Enter the path to the file that will hold the key.By default, the file name id_rsa, which represents an RSA v2 key, appears in parentheses. You can select this file by pressing Return. Or, you can type an alternative filename.The public key name is created automatically and the string .pub is appended to the private key name.
- Enter a passphrase for using your key.This passphrase is used for encrypting your private key. A good passphrase is 10–30 characters long, mixes alphabetic and numeric characters, and avoids simple English prose and English names. A null entry means no passphrase is used, but this entry is strongly discouragedfor user accounts. Note that the passphrase is not displayed when you type it in.
- Re-enter the passphrase to confirm it.
- Check the results.The key fingerprint (a colon-separated series of 2 digit hexadecimal values) is displayed. Check that the path to the key is correct. In the example, the path is /home/johndoe/.ssh/id_rsa.pub. At this point, you have created a public/private key pair.
- Copy the public key and append the key to the $HOME/.ssh/authorized_keys file in your home directory on the remote host.