code: def import_key_pair(self, key_name, public_key_material):
          
          public_key_material = base64.b64encode(public_key_material)
          params = {'KeyName' : key_name,
                    'PublicKeyMaterial' : public_key_material}
          return self.get_object('ImportKeyPair', params, KeyPair, verb='POST')
docs: mports the public key from an RSA key pair that you created
          with a third-party tool.
  
          Supported formats:
  
          * OpenSSH public key format (e.g., the format
            in ~/.ssh/authorized_keys)
  
          * Base64 encoded DER format
  
          * SSH public key file format as specified in RFC4716
  
          DSA keys are not supported. Make sure your key generator is
          set up to create RSA keys.
  
          Supported lengths: 1024, 2048, and 4096.
  
          :type key_name: string
          :param key_name: The name of the new keypair
  
          :type public_key_material: string
          :param public_key_material: The public key. You must base64 encode
                                      the public key material before sending
                                      it to AWS.
  
          :rtype: :class:`boto.ec2.keypair.KeyPair`
          :return: The newly created :class:`boto.ec2.keypair.KeyPair`.
                   The material attribute of the new KeyPair object
                   will contain the the unencrypted PEM encoded RSA private key.