chore(license): Replace copyright and license text with SPDX identifiers

In case a one to one translation was possible I replaced the license
and copyright text with SPDX identifiers.
In case replacing wasn't possible completely I kept the part that goes
in detail to the copyright such as sections that explain the source of
the original code.

Resolves #39

Signed-off-by: Björn Bidar <bjorn.bidar@jolla.com>

src/cisco-decrypt.c

@@ -1,21 +1,11 @@
-/* Decoder for password encoding of Cisco VPN client.
-   Copyright (C) 2005 Maurice Massar
+/*
+  Decoder for password encoding of Cisco VPN client.
+  Thanks to HAL-9000@evilscientists.de for decoding and posting the algorithm!
 
-   Thanks to HAL-9000@evilscientists.de for decoding and posting the algorithm!
+  SPDX-FileCopyrightText: 2005 Maurice Massar
+  SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+  SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include "decrypt-utils.h"

src/config.c

@@ -1,21 +1,10 @@
-/* IPSec VPN client compatible with Cisco equipment.
-   Copyright (C) 2004-2005 Maurice Massar
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
+/*
+   IPSec VPN client compatible with Cisco equipment.
 
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+   SPDX-FileCopyrightText: 2004-2005 Maurice Massar
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   $Id$
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #define _GNU_SOURCE

src/crypto-gnutls.c

@@ -1,18 +1,10 @@
-/* IPSec VPN client compatible with Cisco equipment.
+/*
+   IPSec VPN client compatible with Cisco equipment.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
+   SPDX-FileCopyrightText: 2019 Davide Pucci
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>

src/crypto-gnutls.h

@@ -1,18 +1,10 @@
-/* IPSec VPN client compatible with Cisco equipment.
+/*
+   IPSec VPN client compatible with Cisco equipment.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
+   SPDX-FileCopyrightText: 2019 Davide Pucci
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef VPNC_CRYPTO_GNUTLS_H

src/crypto-openssl.c

@@ -1,18 +1,10 @@
-/* IPSec VPN client compatible with Cisco equipment.
+/*
+   IPSec VPN client compatible with Cisco equipment.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
+   SPDX-FileCopyrightText: 2019 Davide Pucci
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>

src/crypto-openssl.h

@@ -1,18 +1,10 @@
-/* IPSec VPN client compatible with Cisco equipment.
+/*
+   IPSec VPN client compatible with Cisco equipment.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
+   SPDX-FileCopyrightText: 2019 Davide Pucci
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef OPENSSL_GPL_VIOLATION

src/crypto.c

@@ -1,18 +1,10 @@
-/* IPSec VPN client compatible with Cisco equipment.
+/*
+   IPSec VPN client compatible with Cisco equipment.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
+   SPDX-FileCopyrightText: 2019 Davide Pucci
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include <stdio.h>

src/crypto.h

@@ -1,18 +1,7 @@
-/* IPSec VPN client compatible with Cisco equipment.
+/*
+   IPSec VPN client compatible with Cisco equipment.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef VPNC_CRYPTO_H

src/decrypt-utils.c

@@ -1,23 +1,13 @@
-/* IPSec VPN client compatible with Cisco equipment.
-   Copyright (C) 2004-2007 Maurice Massar
-   A bit reorganized in 2007 by Wolfram Sang
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-
-   $Id$
- */
+/*
+   IPSec VPN client compatible with Cisco equipment.
+
+   SPDX-FileCopyrightText: 2004-2007 Maurice Massar
+   SPDX-FileCopyrightText: 2007 Wolfram Sang
+   SPDX-FileCopyrightText: 2019 Davide Pucci
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
+
+   SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #define _GNU_SOURCE
 

src/decrypt-utils.h

@@ -1,22 +1,12 @@
-/* IPSec VPN client compatible with Cisco equipment.
-   Copyright (C) 2004-2007 Maurice Massar
-   A bit reorganized in 2007 by Wolfram Sang
+/*
+   IPSec VPN client compatible with Cisco equipment.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
+   SPDX-FileCopyrightText: 2004-2007 Maurice Massar
+   SPDX-FileCopyrightText: 2007 Wolfram Sang
+   SPDX-FileCopyrightText: 2019 Davide Pucci
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-
-   $Id$
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef VPNC_DECRYPT_UTILS_H

src/dh.c

@@ -4,28 +4,11 @@
 /*	$EOM: dh.c,v 1.5 1999/04/17 23:20:22 niklas Exp $	*/
 
 /*
- * Copyright (c) 1998 Niels Provos.  All rights reserved.
- * Copyright (c) 1999 Niklas Hallqvist.  All rights reserved.
+ * SPDX-FileCopyrightText: 1998 Niels Provos
+ * SPDX-FileCopyrightText: 1999 Niklas Hallqvist
+ * SPDX-FileCopyrightText: 2023 Jolla Ltd.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * SPDX-License-Identifier: BSD-2-Clause
  */
 
 /*

src/dh.h

@@ -4,27 +4,10 @@
 /*	$EOM: dh.h,v 1.4 1999/04/17 23:20:24 niklas Exp $	*/
 
 /*
- * Copyright (c) 1998 Niels Provos.  All rights reserved.
+ * SPDX-FileCopyrightText: 1998 Niels Provos
+ * SPDX-FileCopyrightText: 2023 Jolla Ltd.
  *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * SPDX-License-Identifier: BSD-2-Clause
  */
 
 /*

src/isakmp-pkt.c

@@ -1,23 +1,12 @@
-/* ISAKMP packing and unpacking routines.
-   Copyright (C) 2002  Geoffrey Keating
-   Copyright (C) 2003-2005 Maurice Massar
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-
-   $Id$
- */
+/*
+   ISAKMP packing and unpacking routines.
+
+   SPDX-FileCopyrightText: 2002 Geoffrey Keating
+   SPDX-FileCopyrightText: 2003-2005 Maurice Massar
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
+
+   SPDX-License-Identifier: GPL-2.0-or-later
+*/
 
 #include <assert.h>
 #include <stdlib.h>

src/isakmp-pkt.h

@@ -1,22 +1,11 @@
-/* ISAKMP packing and unpacking routines.
-   Copyright (C) 2002  Geoffrey Keating
-   Copyright (C) 2003-2005 Maurice Massar
+/*
+   ISAKMP packing and unpacking routines.
 
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
-   (at your option) any later version.
+   SPDX-FileCopyrightText: 2002 Geoffrey Keating
+   SPDX-FileCopyrightText: 2003-2005 Maurice Massar
+   SPDX-FileCopyrightText: 2023 Jolla Ltd.
 
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-
-   $Id$
+   SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #ifndef VPNC_ISAKMP_PKT_H