docs: def PrivateToPublicOpenSSH(key, host):
    """ Computes the OpenSSH public key format given a private key. """
    # Create public key from private key.
    ssh_rsa = '00000007' + base64.b16encode('ssh-rsa')
    # Exponent.
    exponent = '%x' % (key.e,)
    if len(exponent) % 2:
        exponent = '0' + exponent
    ssh_rsa += '%08x' % (len(exponent) / 2,)
    ssh_rsa += exponent
    modulus = '%x' % (key.n,)
    if len(modulus) % 2:
        modulus = '0' + modulus
    if modulus[0] in '89abcdef':
        modulus = '00' + modulus
    ssh_rsa += '%08x' % (len(modulus) / 2,)
    ssh_rsa += modulus
    hash_string = base64.b64encode(base64.b16decode(ssh_rsa.upper()))
    public_key = 'ssh-rsa %s %s' % (hash_string, host)
    return public_key