Initial commit.

diff --git a/crypto-install.py b/crypto-install.py
new file mode 100755 (executable)
index 0000000..2e3b926
--- /dev/null
+++ b/crypto-install.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python
+# -*- mode: python; coding: utf-8-unix; -*-
+
+
+import argparse, ConfigParser, os, sys, textwrap
+
+
+def print_version ():
+    print ("crypto-install.py GIT-TAG (GIT-REVISION)")
+
+
+def input_string (prompt=""):
+    if sys.version_info[0] == 2:
+        return raw_input(prompt)
+    return input(prompt)
+
+
+def parse_arguments ():
+    parser = argparse.ArgumentParser ()
+    parser.add_argument (
+        "-v", "--version",
+        dest = "version",
+        action = "store_true",
+        help = "Display version.")
+    parser.add_argument (
+        "--no-gpg",
+        dest = "gnupg",
+        action = "store_false",
+        help = "Disable GnuPG setup.")
+    parser.add_argument (
+        "--no-ssh",
+        dest = "openssh",
+        action = "store_false",
+        help = "Disable OpenSSH setup.")
+    parser.add_argument (
+        "--ssh-config",
+        dest = "openssh_config",
+        default = "~/.ssh/config",
+        help = "Set path for OpenSSH configuration file.")
+    return parser.parse_args ()
+
+
+def gnupg_setup ():
+    if False:
+        print("Default GnuPG key already exists.")
+        return
+
+    print (textwrap.fill (textwrap.dedent("""\
+    No default GnuPG key available.  Please enter your information to
+    create a new key."""), width = 80))
+
+    name = input_string("What is your name?  (Max Mustermann) ")
+    email = input_string("What is your email address?  (max@example.de) ")
+    motto = input_string("What is your motto phrase, if any?  (Schlüssel für 2014) ")
+
+
+def openssh_setup (arguments):
+    if not os.path.exists(arguments.openssh_config):
+        with open(arguments.openssh_config, "w") as ssh_config:
+            ssh_config.write(textwrap.dedent("""\
+            ForwardAgent yes
+            ForwardX11 yes
+            """))
+
+    if os.path.exists (os.path.expanduser ("~/.ssh/id_rsa")) \
+       or os.path.exists (os.path.expanduser ("~/.ssh/id_dsa")):
+        print("OpenSSH key already exists.")
+        return
+
+    print (textwrap.fill (textwrap.dedent("""\
+    No OpenSSH key available.  Generating new key."""), width = 80))
+
+    os.system ("ssh-keygen")
+
+
+def main ():
+    args = parse_arguments ()
+
+    if args.version:
+        print_version ()
+        sys.exit ()
+
+    if args.gnupg:
+        gnupg_setup ()
+
+    if args.openssh:
+        openssh_setup (args)
+
+
+if __name__ == "__main__":
+    main ()