Initial commit and release for Christmas with love1.0.0

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diff --git a/COPYING b/COPYING
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--- /dev/null
+++ b/COPYING
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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
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+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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 3 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, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..94a9ed0
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
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+
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+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
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+  If the Program specifies that a proxy can decide which future
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+  Later license versions may give you additional or different
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+                     END OF TERMS AND CONDITIONS
+
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+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    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
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+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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+    You should have received a copy of the GNU General Public License
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+  You should also get your employer (if you work as a programmer) or school,
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+<http://www.gnu.org/licenses/>.
+
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+may consider it more useful to permit linking proprietary applications with
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diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5c543f4
--- /dev/null
+++ b/README.md
@@ -0,0 +1,289 @@
+# etoolkit
+
+*etoolkit* is a simple toolkit for defining and setting environment variables
+in a flexible and secure way.
+
+
+## General
+
+*etoolkit* started as a simple idea while I was working at the University
+of Oslo. Later I felt the need for even more flexible solution. The following
+goals were set:
+
+- the ability to define env. var. "instances" with support for inheritance
+
+- encrypting values using a master password
+
+- the ability to spawn a child process with the defined variables
+
+- support for macros
+
+
+## Requirements
+
+Apart from Python >= 3.7, the only requirement is
+[cryptography](https://pypi.org/project/cryptography/)
+
+
+## Overview
+
+In a typical UNIX environment, env. variables are usually set in one
+or more of the initialization / startup files like f.i. */etc/profile*,
+*~/.bash_profile*, *~/.bashrc*, *~/.tcshrc*, *~/.cshrc* ... depending
+on the OS, shell, distribution... etc.
+Env. variables represent key-value pairs (env. variable name and its value).
+
+A potential problem when dealing with env. variables containing sensitive
+values like passwords, tokens, connection strings... is that they are inherited
+by all child processes spawned from the login / interactive shell.
+
+A malicious / exploited process (like f.i. web browser) will then be able to
+fetch those values by using *getenv*. Such process may in addition be able to
+simply read *~/.bashrc* or any similar file readable by the process owner and
+get the values from there if necessary.
+
+*etoolkit* attempts to solve both of these problems.
+
+When started, it reads env. variables from its own configuration file.
+Sensitive data may be encrypted using a master password. Hence reading
+etoolkit's configuration file will not reveal the real value of the data.
+
+When *etoolkit* has processed (decryption, macro replacement, etc) its data,
+it may define new env. variables corresponding to that data and may start a new
+interactive shell. The processed environment variables will not be available
+for processes that were not spawned by that same *etoolkit* session.
+
+
+## Installation
+
+### pip (pypi)
+
+   ```bash
+   pip install etoolkit
+   ```
+
+
+### Gentoo
+
+   ```bash
+   layman -a sgs
+   emerge dev-python/etoolkit
+   ```
+
+
+## Setup and examples
+
+Most users (including me) will simply use the command line interface (CLI).
+
+
+### CLI
+
+*etoolkit* comes with a simple CLI:
+
+   ```bash
+   python -m etoolkit -h
+   ```
+
+... or even (if *etoolkit* was installed using the methods described above)
+
+   ```bash
+   etoolkit -h
+   ```
+
+
+The *etoolkit* CLI loads the configuration located by default in
+*~/.etoolkit.json*. That file is based on
+[etoolkit_sample.json](https://github.com/blackm0re/etoolkit/blob/master/etoolkit_sample.json).
+
+The *"instances"* part of the configuration defines unique instances, each of
+which represents its own environment with its own defined env. variables.
+Each instance consists of key-value pairs corresponding to env. name and value.
+All pairs will result in corresponding env. variables being defined, with the
+exception of the following *etoolkit* internal keys:
+
+- **ETOOLKIT_PARENT** - string - reference to another instance
+
+- **ETOOLKIT_SENSITIVE** - list - env. variables containing sensitive data
+
+All pairs defined in *"general"* (currently only **MASTER_PASSWORD_HASH**) are
+*etoolkit* internal as well.
+
+An instance may inherit (and if desired overwrite) key value pairs from its
+parent.
+
+Variables containing sensitive data can be encrypted / decrypted using a master
+password. Currently *etoolkit* requires that all values in a configuration
+file are encrypted with the same master password. Setting a master password
+hash is a recommended but not mandatory.
+
+   ```bash
+   etoolkit -p
+   ```
+
+That command will prompt for master password and output a hash that can then
+be stored  
+in ["general"]["MASTER_PASSWORD_HASH"].  
+The hash is only used for verifying that a correct master password has been
+provided at a later time. Issuing:
+
+   ```bash
+   etoolkit -e
+   ```
+
+will prompt for the master password, then for the value to be encrypted and
+finally display the encrypted string of the value. Unless invoked with the
+*-E* / *--echo* parameter *etoolkit* will not display the value that is about
+to be encrypted.
+
+More than one value can be encrypted / decrypted with a single master password
+prompt if *-m* / *--multiple-values* parameter is provided. Manual decryption
+of single value(s):
+
+   ```bash
+   etoolkit -d -m
+   ```
+
+Listing all available instances defined in the configuration file and then
+loading a specific instance can be achieved by:
+
+   ```bash
+   etoolkit -l
+   etoolkit <instance-name>
+   ```
+
+*etoolkit* will prompt for the master password the first time it encounters
+and encrypted value. Once provided the master password will be used to decrypt
+the rest of the encrypted values.
+
+When all values are fetched from a given instance (and its parents) and then
+decrypted, they are further processed by replacing macros with their
+corresponding values. Currently the following macros are supported:
+
+- **%h** - the home directory of the user running *etoolkit* (~/)
+
+- **%i** - the names of the instance that is about to be loaded
+
+- **%u** - the username of the user running *etoolkit* (*getpass.getuser()*)
+
+In addition, value starting with *":"* is appended to the existing value
+(if any) of the env. variable about to be set
+(like *MYVAR=$MYVAR\<new value\>)*).  
+The opposite is true for value ending with *":"* (*MYVAR=\<new value\>$MYVAR*).
+
+When the variables are finally processed, *etoolkit* sets / changes them as env.
+variables (using *setenv* / *os.environ.update*) and spawns an interactive
+child process (by invoking *system($SHELL)*).
+
+One can also spawn a different process than an interactive shell by using the
+*-s* / *--spawn* parameter.
+
+   ```bash
+   etoolkit -s /bin/othershell <instance-name>
+   ```
+
+Contact the author for questions and suggestions! :)
+
+
+### Using the *EtoolkitInstance* class
+
+*etoolkit* comes with its own *etoolkit* package that contains the
+*EtoolkitInstance* class.
+
+The class encapsulates the function of creating and processing instances
+from a given structure (dict).
+
+It may be useful if one should prefer for example making her own CLI interface.
+or the *instances* structure being loaded from a diferent configuration file
+(f.i. .yml).
+
+   ```python
+   import os
+
+   import etoolkit
+
+
+   # using some static methods in order to create encrypted values
+   etoolkit.EtoolkitInstance.encrypt('the very secret passwd', 'secret1')
+   # Out: 'enc-val$1$Y/TBb1F3siHTw6qZg9ERzZfA8PLPf2CwGSQLpu9jYWw=$FT5tS9o+ABvsxogIXpJim16Gz5SVtV8='
+
+   etoolkit.EtoolkitInstance.encrypt('the very secret passwd', 'secret2')
+   # Out: 'enc-val$1$vIBcoCNiYrsDLtF41uLuSEnppBjhliD0B8jwcBJcj/c=$KwOGe/y1dlxktDaCnJPIVNuaQ4Q7yNo='
+
+
+   # The encrypted values will be used in our configuration structure
+   # The following structure defines the 3 instances: default, dev and secret
+   instances = {
+       "general": {
+       },
+       "instances": {
+           "default": {
+               "ETOOLKIT_PROMPT": "(%i)"
+           },
+           "dev": {
+               "ETOOLKIT_PARENT": "default",
+               "PYTHONPATH": ":/home/user/.pythonpath",
+               "DB_CONNECTION": "enc-val$1$Y/TBb1F3siHTw6qZg9ERzZfA8PLPf2CwGSQLpu9jYWw=$FT5tS9o+ABvsxogIXpJim16Gz5SVtV8="
+           },
+           "secret": {
+               "ETOOLKIT_PARENT": "default",
+               "ETOOLKIT_SENSITIVE": ["PASSWORD"],
+               "GNUPGHOME": "%h/private/.gnupg",
+               "PASSWORD": "enc-val$1$vIBcoCNiYrsDLtF41uLuSEnppBjhliD0B8jwcBJcj/c=$KwOGe/y1dlxktDaCnJPIVNuaQ4Q7yNo="
+           }
+       }
+   }
+
+
+   dev_instance = etoolkit.EtoolkitInstance('dev', instances)
+
+   # fetch the variables before the processing stage (calling get_environ())
+   # since raw_env_variables is a dict, it can be modified (f.i. .update())
+   dev_instance.raw_env_variables
+
+   dev_instance.master_password = 'the very secret passwd'  # or perhaps using getpass
+   env_vars = dev_instance.get_env()
+   print(env_vars['PASSWORD'])  # outputs: 'secret2'
+   
+   inst.dump_env(env_vars)  # prints all values, with the exception of 'PASSWORD'
+
+   # set the env. variables.
+   os.environ.update(env_vars)
+   ```
+
+
+### Tips
+
+When starting a new interactive process (f.i. bash), the process will
+in turn invoke its startup script (f.i. *~/.bashrc*).  
+Avoid redefining the env. variables that have just been set by *etoolkit*!
+
+If you want your shell prompt to display the name of the loaded instance, you
+can set a new env. variable (f.i. "ETOOLKIT_PROMPT" as shown in the sample
+configuration above) and then add the following at the bottom of your startup
+file (f.i. ~/.bashrc):
+
+   ```bash
+   if [ -n "$ETOOLKIT_PROMPT" ]; then
+   export PS1="$ETOOLKIT_PROMPT$PS1"
+   fi
+   ```
+
+
+## Support and contributing
+
+*etoolkit* is hosted on GitHub: https://github.com/blackm0re/etoolkit
+
+
+## Author
+
+Simeon Simeonov - sgs @ LiberaChat
+
+
+## [License](https://github.com/blackm0re/etoolkit/blob/master/LICENSE)
+
+Copyright (c) 2021, Simeon Simeonov
+All rights reserved.
+
+[Licensed](https://github.com/blackm0re/etoolkit/blob/master/LICENSE) under the
+GNU General Public License v3.0 or later.
+SPDX-License-Identifier: GPL-3.0-or-later
diff --git a/etoolkit/__init__.py b/etoolkit/__init__.py
new file mode 100644
index 0000000..9a6d9aa
--- /dev/null
+++ b/etoolkit/__init__.py
@@ -0,0 +1,34 @@
+# etoolkit
+# Copyright (C) 2021 Simeon Simeonov
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+"""A simple toolkit for setting environment variables in a flexible way"""
+from .etoolkit import EtoolkitInstance, EtoolkitInstanceError
+
+__author__ = 'Simeon Simeonov'
+__version__ = '1.0.0'
+__license__ = 'GPL3'
+
+
+def int_or_str(value):
+    """Returns int value of value when possible"""
+    try:
+        return int(value)
+    except ValueError:
+        return value
+
+
+VERSION = tuple(map(int_or_str, __version__.split('.')))
+
+__all__ = ['EtoolkitInstance', 'EtoolkitInstanceError']
diff --git a/etoolkit/__main__.py b/etoolkit/__main__.py
new file mode 100644
index 0000000..8c4245d
--- /dev/null
+++ b/etoolkit/__main__.py
@@ -0,0 +1,276 @@
+# etoolkit
+# Copyright (C) 2021 Simeon Simeonov
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+"""
+CLI entry point for the etoolkit package
+
+Examples:
+python -m etoolkit -h
+
+python -m etoolkit -p
+"""
+import argparse
+import errno
+import getpass
+import json
+import logging
+import os
+import sys
+
+import etoolkit
+
+DEFAULT_LOG_FORMAT = "%(levelname)s: %(message)s"
+DEFAULT_LOG_LEVEL = logging.WARNING
+
+logger = logging.getLogger(__name__)
+
+
+def decrypt_value(args: argparse.Namespace, config: dict):
+    """
+    Interactive function for decrypting value(s)
+
+    Prompts for master key password and then prompts for a value to decrypt
+
+    The decrypted value is printed to stdout
+
+    :param args: The arguments sent by the caller
+    :type args: arparse.Namespace
+
+    :param config: The config dict sent by the caller
+    :type config: dict
+    """
+    password_hash = None
+    if 'general' in config:
+        password_hash = config['general'].get('MASTER_PASSWORD_HASH')
+    password = etoolkit.EtoolkitInstance.confirm_password_prompt(
+        password_hash, False
+    )
+    while True:
+        try:
+            value = input('Value: ')
+            print(
+                'Decrypted value: '
+                f'{etoolkit.EtoolkitInstance.decrypt(password, value)}'
+            )
+            if not args.multiple_values:
+                break
+        except KeyboardInterrupt:
+            print(os.linesep)
+            break
+
+
+def encrypt_value(args: argparse.Namespace, config: dict):
+    """
+    Interactive function for encrypting value(s)
+
+    Prompts for master key password and then prompts for a value to encrypt
+
+    The encrypted value is printed to stdout
+
+    :param args: The arguments sent by the caller
+    :type args: arparse.Namespace
+
+    :param config: The config dict sent by the caller
+    :type config: dict
+    """
+    password_hash = None
+    if 'general' in config:
+        password_hash = config['general'].get('MASTER_PASSWORD_HASH')
+    password = etoolkit.EtoolkitInstance.confirm_password_prompt(password_hash)
+    while True:
+        try:
+            if args.echo:
+                value = input('Value: ')
+            else:
+                value = getpass.getpass('Value: ')
+            print(
+                'Encrypted value: '
+                f'{etoolkit.EtoolkitInstance.encrypt(password, value)}'
+            )
+            if not args.multiple_values:
+                break
+        except KeyboardInterrupt:
+            print(os.linesep)
+            break
+
+
+def main(inargs=None):
+    """main entry point"""
+    parser = argparse.ArgumentParser(
+        prog=__package__,
+        epilog=(
+            f'%(prog)s {etoolkit.__version__} by Simeon Simeonov '
+            '(sgs @ LiberaChat)'
+        ),
+        description='The following options are available',
+    )
+    group = parser.add_mutually_exclusive_group(required=True)
+    group.add_argument(
+        'instance',
+        metavar='<instance>',
+        nargs='?',
+        type=str,
+        help='The instance to be loaded',
+    )
+    group.add_argument(
+        '-d',
+        '--decrypt-value',
+        dest='decrypt_value',
+        action='store_true',
+        required=False,
+        help=(
+            'Prompt for master password & value to decrypt, '
+            'display the decrypted value and exit'
+        ),
+    )
+    group.add_argument(
+        '-e',
+        '--encrypt-value',
+        dest='encrypt_value',
+        action='store_true',
+        required=False,
+        help=(
+            'Prompt for master password & value to encrypt, '
+            'display the encrypted value and exit'
+        ),
+    )
+    group.add_argument(
+        '-l',
+        '--list',
+        dest='list',
+        action='store_true',
+        required=False,
+        help='List all defined instances',
+    )
+    group.add_argument(
+        '-p',
+        '--generate-master-password-hash',
+        dest='password_hash',
+        action='store_true',
+        required=False,
+        help='Prompt for master password, display the generated hash and exit',
+    )
+    parser.add_argument(
+        '-c',
+        '--config-file',
+        metavar='<path>',
+        type=str,
+        default=os.path.expanduser(
+            os.environ.get('ETOOLKIT_CONFIG', '~/.etoolkit.json')
+        ),
+        dest='config_file',
+        help='JSON config file (default: ~/.etoolkit.json)',
+    )
+    parser.add_argument(
+        '-E',
+        '--echo',
+        dest='echo',
+        action='store_true',
+        help='Display the value to be encrypted (used together with -e)',
+    )
+    parser.add_argument(
+        '-m',
+        '--multiple-values',
+        dest='multiple_values',
+        action='store_true',
+        help=(
+            'Prompt for more than one value when '
+            'encrypting / decrypting until terminated '
+            '(Ctrl+C) (used together with -d / -e)'
+        ),
+    )
+    parser.add_argument(
+        '-q',
+        '--no-output',
+        dest='dump_output',
+        action='store_false',
+        default=True,
+        help='Do not print environment variables to stdout',
+    )
+    parser.add_argument(
+        '-s',
+        '--spawn',
+        metavar='<path>',
+        type=str,
+        default='',
+        dest='spawn',
+        help='Spawn another process than $SHELL',
+    )
+    parser.add_argument(
+        '-v',
+        '--version',
+        action='version',
+        version=f'%(prog)s {etoolkit.__version__}',
+        help='Display program-version and exit',
+    )
+    args = parser.parse_args(inargs)
+    try:
+        with open(args.config_file, 'r', encoding='utf-8') as fp:
+            config_dict = json.load(fp)
+    except Exception as e:
+        logger.error("Unable to parse %r: %s", args.config_file, e)
+        raise SystemExit(errno.EIO) from e
+
+    try:
+        if args.decrypt_value:
+            decrypt_value(args, config_dict)
+            sys.exit(0)
+        if args.encrypt_value:
+            encrypt_value(args, config_dict)
+            sys.exit(0)
+        if args.password_hash:
+            master_password = (
+                etoolkit.EtoolkitInstance.confirm_password_prompt()
+            )
+            phash = etoolkit.EtoolkitInstance.get_new_password_hash(
+                master_password
+            )
+            print(f'Master password hash: {phash}')
+            sys.exit(0)
+        if args.list:
+            for instance_name in sorted(
+                config_dict.get('instances', {}).keys()
+            ):
+                print(instance_name)
+            sys.exit(0)
+
+        inst = etoolkit.EtoolkitInstance(args.instance, config_dict)
+        inst.prompt_func = etoolkit.EtoolkitInstance.confirm_password_prompt
+        env = inst.get_environ()
+
+        if args.dump_output:
+            inst.dump_env(env)
+
+        os.environ.update(env)
+
+        if args.spawn:
+            os.system(args.spawn)
+        else:
+            os.system(os.getenv('SHELL', 'bash'))
+    except KeyboardInterrupt:
+        logger.debug('KeyboardInterrupt')
+        print(os.linesep)
+        sys.exit(0)
+    except etoolkit.EtoolkitInstanceError as e:
+        logger.error('EtoolkitInstanceError: %s', e)
+        sys.exit(1)
+    except Exception as e:
+        logger.error('Unexpected exception: %s', e)
+        sys.exit(1)
+
+
+if __name__ == '__main__':
+    logging.basicConfig(level=DEFAULT_LOG_LEVEL, format=DEFAULT_LOG_FORMAT)
+    main()
diff --git a/etoolkit/etoolkit.py b/etoolkit/etoolkit.py
new file mode 100755
index 0000000..837d13a
--- /dev/null
+++ b/etoolkit/etoolkit.py
@@ -0,0 +1,406 @@
+# etoolkit
+# Copyright (C) 2021 Simeon Simeonov
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+"""The main module of the etoolkit package"""
+import base64
+import getpass
+import hashlib
+import os
+
+from cryptography.exceptions import InvalidTag
+from cryptography.hazmat.primitives.ciphers.aead import AESGCM
+
+
+class EtoolkitInstanceError(Exception):
+    """EtoolkitInstanceError - Generic exceptions related to instances"""
+
+
+class EtoolkitInstance:
+    """A basic class representing a single instance"""
+
+    def __init__(self, name: str, data: dict):
+        """
+        :param name: Instance name
+        :type name: str
+
+        :param data: .etoolkit.json alike dict
+        :type data: dict
+        """
+        self._name = name
+        self._parent = None
+        self._raw_env_variables = {}
+        self._sensitive_env_variables = []
+        self._master_password = None
+        self._master_password_hash = None
+        self._prompt_func = None  # function to use when prompting for input
+        try:
+            inst_data = data['instances'][name]
+        except KeyError as e:
+            raise EtoolkitInstanceError(f'Unknown instance "{name}"') from e
+        if inst_data.get('ETOOLKIT_PARENT'):
+            self._parent = EtoolkitInstance(inst_data['ETOOLKIT_PARENT'], data)
+            self._raw_env_variables.update(self._parent.raw_env_variables)
+            self._sensitive_env_variables.extend(
+                self._parent.sensitive_env_variables
+            )
+        if inst_data.get('ETOOLKIT_SENSITIVE'):
+            if not isinstance(inst_data['ETOOLKIT_SENSITIVE'], list):
+                raise EtoolkitInstanceError(
+                    '"ETOOLKIT_SENSITIVE" must be a list'
+                )
+            self._sensitive_env_variables.extend(
+                inst_data['ETOOLKIT_SENSITIVE']
+            )
+        self._raw_env_variables.update(inst_data)
+        # remove non env. variable data
+        self._raw_env_variables.pop('ETOOLKIT_PARENT', None)
+        self._raw_env_variables.pop('ETOOLKIT_SENSITIVE', None)
+        if 'general' in data and 'MASTER_PASSWORD_HASH' in data['general']:
+            self._master_password_hash = data['general'][
+                'MASTER_PASSWORD_HASH'
+            ]
+
+    @property
+    def master_password(self) -> str:
+        """master_password-property"""
+        return self._master_password
+
+    @master_password.setter
+    def master_password(self, value):
+        """master_password-property setter"""
+        self._master_password = value
+
+    @property
+    def master_password_hash(self) -> str:
+        """master_password_hash-property"""
+        return self._master_password_hash
+
+    @master_password_hash.setter
+    def master_password_hash(self, value):
+        """master_password_hash-property setter"""
+        self._master_password_hash = value
+
+    @property
+    def name(self) -> str:
+        """name-property"""
+        return self._name
+
+    @property
+    def prompt_func(self):
+        """prompt_func-property"""
+        return self._prompt_func
+
+    @prompt_func.setter
+    def prompt_func(self, value):
+        """prompt_func-property setter"""
+        self._prompt_func = value
+
+    @property
+    def raw_env_variables(self) -> dict:
+        """raw_env_variables-property"""
+        return self._raw_env_variables
+
+    @property
+    def sensitive_env_variables(self) -> list:
+        """sensitive_env_variables-property"""
+        return self._sensitive_env_variables
+
+    @staticmethod
+    def confirm_password_prompt(
+        password_hash: str = None, confirm: bool = True
+    ) -> str:
+        """
+        Prompts for master password and then for confirmation if `confirm` True
+
+        :param password_hash: Hash to compare with instead of confirm
+        :type password_hash: str
+
+        :param confirm: Confirm the password (and see if there is a match)
+        :type confirm: bool
+
+        :return: Password provided by the user
+        :rtype: str
+        """
+        try:
+            while True:
+                pass1 = getpass.getpass('Type master password: ')
+                if password_hash:
+                    if EtoolkitInstance.password_matches(pass1, password_hash):
+                        return pass1
+                    print('Wrong password')
+                    continue
+                if confirm:
+                    pass2 = getpass.getpass('Confirm master password: ')
+                    if not pass1 or pass1 != pass2:
+                        print('The passwords are either empty or do not match')
+                        continue
+                return pass1.strip()
+        except Exception as e:
+            raise EtoolkitInstanceError('Prompt error') from e
+
+    @staticmethod
+    def decrypt(password: str, edata: str) -> str:
+        """
+        Decrypts `edata` using `password`.
+
+        `edata` is in the following format:
+        enc-val$`version-num`$`bas64-salt`$`base64-encrypted_data`
+
+        :param password: The password to generate the key with
+        :type password: str
+
+        :param edata: The data to be decrypted
+        :type edata: str
+
+        :return: The output string / decrypted data
+        :rtype: str
+        """
+        # check for supported versions
+        if not edata.startswith('enc-val$1$'):
+            raise EtoolkitInstanceError(
+                f'Unsupported encryption format: {edata}'
+            )
+        try:
+            salt, data = [base64.b64decode(t) for t in edata[10:].split('$')]
+            nonce = salt[:12]
+            aesgcm = AESGCM(
+                hashlib.scrypt(
+                    password.encode('utf-8'),
+                    salt=salt,
+                    n=2 ** 14,
+                    r=8,
+                    p=1,
+                    dklen=32,
+                )
+            )
+            return aesgcm.decrypt(nonce, data, salt).decode()
+        except InvalidTag as e:
+            raise EtoolkitInstanceError(
+                f'Invalid tag when decrypting: {edata}'
+            ) from e
+        except Exception as e:
+            raise EtoolkitInstanceError(
+                f'Error when decrypting: {edata}'
+            ) from e
+
+    @staticmethod
+    def encrypt(password: str, data: str) -> str:
+        """
+        Encrypts `data` using `password`.
+
+        The output string is in the following format:
+        enc-val$`version-num`$`bas64-salt`$`base64-encrypted_data`
+
+        :param password: The password to generate the key with
+        :type password: str
+
+        :param data: The data to be encrypted
+        :type data: str
+
+        :return: The output string
+        :rtype: str
+        """
+        salt = os.urandom(32)
+        aesgcm = AESGCM(
+            hashlib.scrypt(
+                password.encode('utf-8'),
+                salt=salt,
+                n=2 ** 14,
+                r=8,
+                p=1,
+                dklen=32,
+            )
+        )
+        nonce = salt[:12]
+        edata = aesgcm.encrypt(nonce, data.encode('utf-8'), salt)
+        return (
+            f'enc-val$1${base64.b64encode(salt).decode()}$'
+            f'{base64.b64encode(edata).decode()}'
+        )
+
+    @staticmethod
+    def get_new_password_hash(password: str) -> str:
+        """
+        Returns a complete password hash based on `password`
+
+        This password hash is *not* used as a key when encrypting / decrypting
+        but only for optional check if a correct master password is provided.
+
+        :param password: The plaintext password
+        :type password: str
+
+        :return: The hashed version of `password`
+        :rtype: str
+        """
+        hash_algo = 'sha256'
+        iterations = 100000
+        salt = os.urandom(32)
+        key = hashlib.pbkdf2_hmac(
+            hash_algo, password.encode('utf-8'), salt, iterations
+        )
+        return (
+            f'pbkdf2_{hash_algo}${iterations}$'
+            f'{base64.b64encode(salt).decode()}$'
+            f'{base64.b64encode(key).decode()}'
+        )
+
+    @staticmethod
+    def parse_value(value, macros: dict):
+        """
+        Returns the value with all macros replaced by their values
+
+        If `value` is not of type 'str' simply return `value`
+
+        :param value: A simple value
+        :type value: object
+
+        :param macros: Macros mapping
+        :type macros: dict
+
+        :return: New value with all macros replaced by their values
+        :rtype: object
+        """
+        if not isinstance(value, str):
+            return value
+        for key, val in macros.items():
+            value = value.replace(key, val)
+        return value
+
+    @staticmethod
+    def password_matches(password: str, password_hash: str) -> bool:
+        """
+        Checks `password` agains s stored password hash
+
+        Hash format: pbkdf2_hashalgo$ietarations$salt-base64$key-base64
+
+        :param password: password
+        :type password: str
+
+        :param password_hash: The pbkdf2_hmac password hash
+        :type password_hash: str
+
+        :return: True if the password matches or password_hash is None,
+        :rtype: bool
+        """
+        if password_hash is None:
+            return True
+        # format: pbkdf2_hashalgo$ietarations$salt-base64$key-base64
+        try:
+            tokens = password_hash.split('$')
+            key = hashlib.pbkdf2_hmac(
+                tokens[0].split('_')[1],
+                password.encode('utf-8'),
+                base64.b64decode(tokens[2]),
+                int(tokens[1]),
+            )
+            return key == base64.b64decode(tokens[3])
+        except Exception:
+            return False
+
+    def dump_env(self, env: dict):
+        """
+        Prints an environment dict to stdout.
+
+        :param env: The environment dict
+        :type env: dict
+        """
+        for key, value in env.items():
+            if key in self._sensitive_env_variables:
+                print(f'{key}: ***')
+                continue
+            print(f'{key}: {value}')
+
+    def get_environ(self) -> dict:
+        """
+        Generates a new environ dict
+
+        :return: New environment dict with all macros replaced by their values
+        :rtype: dict
+        """
+        macros = {
+            '%h': os.path.expanduser('~'),
+            '%i': self.name,
+            # '%f': self.get_full_name(),
+            '%u': getpass.getuser(),
+        }
+        new_env = {}
+        for key, value in sorted(
+            self._raw_env_variables.items(), key=lambda x: x[0]
+        ):
+            if not value:
+                # perhaps unset instead of skipping?
+                continue
+            if isinstance(value, str) and value.startswith('enc-val$1$'):
+                value = self._decrypt_value(value)
+            if isinstance(value, str) and value.endswith(':'):
+                # if 'value' ends with ':', append the existing value of
+                # os.environ[key] after the value of 'value'
+                new_env[key] = self.parse_value(
+                    value, macros
+                ) + os.environ.get(key, '')
+            elif isinstance(value, str) and value.startswith(':'):
+                # if 'value' starts with ':', append after the existing value
+                # of os.environ[key]
+                new_env[key] = os.environ.get(key, '') + self.parse_value(
+                    value, macros
+                )
+            else:
+                # completely overwrite the existing value of os.environ[key]
+                new_env[key] = self.parse_value(value, macros)
+        return new_env
+
+    def get_full_name(self, delimiter: str = '') -> str:
+        """
+        Returns the entire instance inheritence path separated by `delimiter`
+
+        The format is:
+        `grandparent-name`<delimiter>`parent-name`<delimiter>`instance-name`
+
+        :param delimiter: Delimiter to separate parent instance names by
+        :type delimiter: str
+
+        :return: Path in case this instance has parent, instance.name otherwise
+        :rtype: str
+        """
+        if self._parent is None:
+            return self.name
+        return self._parent.get_full_name(delimiter) + delimiter + self.name
+
+    def _decrypt_value(self, evalue: str) -> str:
+        """
+        Decrypts an encrypted value using the master password
+
+        The method prompts for the master password when it encounters its
+        first encrypted value since the creation of its EtoolkitInstance
+        object
+
+        `evalue` is in the following format:
+        enc-val$`version-num`$`bas64-salt`$`base64-encrypted_data`
+
+        :param evalue: Encrypted value to be decrypted
+        :type evalue: str
+
+        :return: Decrypted value
+        :rtype: str
+        """
+        if self._master_password is None:
+            if self._prompt_func is None:
+                raise EtoolkitInstanceError(
+                    'Neither password or prompt function set'
+                )
+            self._master_password = self._prompt_func(
+                self._master_password_hash, confirm=False
+            )
+        return EtoolkitInstance.decrypt(self._master_password, evalue)
diff --git a/etoolkit_sample.json b/etoolkit_sample.json
new file mode 100644
index 0000000..66c9d17
--- /dev/null
+++ b/etoolkit_sample.json
@@ -0,0 +1,21 @@
+{
+    "general": {
+        "MASTER_PASSWORD_HASH": "pbkdf2_sha256$100000$kFOQkAPtStZ/Ny/O4501ygHGQnqh5Y+ySxF9qVHriv8=$3BujuWzn3CfDnw4yiD9m3F+GjeW1MHHW40R/ThHNcn0="
+    },
+    "instances": {
+        "default": {
+            "ETOOLKIT_PROMPT": "(%i)"
+        },
+        "dev": {
+            "ETOOLKIT_PARENT": "default",
+            "PYTHONPATH": ":/home/user/.pythonpath",
+            "DB_CONNECTION": "enc-val$1$Y/TBb1F3siHTw6qZg9ERzZfA8PLPf2CwGSQLpu9jYWw=$FT5tS9o+ABvsxogIXpJim16Gz5SVtV8="
+        },
+        "secret": {
+            "ETOOLKIT_PARENT": "default",
+            "ETOOLKIT_SENSITIVE": ["PASSWORD"],
+            "GNUPGHOME": "%h/private/.gnupg",
+            "PASSWORD": "enc-val$1$vIBcoCNiYrsDLtF41uLuSEnppBjhliD0B8jwcBJcj/c=$KwOGe/y1dlxktDaCnJPIVNuaQ4Q7yNo="
+        }
+    }
+}
diff --git a/setup.py b/setup.py
new file mode 100644
index 0000000..b4681c3
--- /dev/null
+++ b/setup.py
@@ -0,0 +1,56 @@
+# -*- coding: utf-8 -*-
+
+import setuptools
+
+import etoolkit
+
+with open('README.md', 'r', encoding='utf-8') as fh:
+    long_description = fh.read()
+
+
+setuptools.setup(
+    name='etoolkit',
+    version=etoolkit.__version__,
+    author=etoolkit.__author__,
+    author_email='sgs@pichove.org',
+    description=(
+        'A simple toolkit for setting environment variables in a flexible way'
+    ),
+    license=etoolkit.__license__,
+    long_description=long_description,
+    long_description_content_type='text/markdown',
+    url='https://github.com/blackm0re/etoolkit',
+    packages=setuptools.find_packages(),
+    exclude_package_data={'': ['.gitignore']},
+    entry_points={
+        'console_scripts': [
+            'etoolkit=etoolkit.__main__:main',
+        ],
+    },
+    classifiers=[
+        'Development Status :: 5 - Production/Stable',
+        'Environment :: Console',
+        'Intended Audience :: Developers',
+        'Intended Audience :: System Administrators',
+        (
+            'License :: OSI Approved :: GNU General Public License v3 or later'
+            ' (GPLv3+)'
+        ),
+        'Programming Language :: Python :: 3 :: Only',
+        'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
+        'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
+        'Programming Language :: Python :: 3.11',
+        'Programming Language :: Python :: Implementation',
+        'Operating System :: POSIX',
+        'Topic :: Security :: Cryptography',
+    ],
+    keywords='unix environment security cryptography',
+    project_urls={
+        'Bug Reports': 'https://github.com/blackm0re/etoolkit/issues',
+        'Source': 'https://github.com/blackm0re/etoolkit',
+    },
+    install_requires=["cryptography>=3.2"],
+    python_requires='>=3.7',
+)
diff --git a/tests/conftest.py b/tests/conftest.py
new file mode 100644
index 0000000..1f70259
--- /dev/null
+++ b/tests/conftest.py
@@ -0,0 +1,59 @@
+# etoolkit
+# Copyright (C) 2021 Simeon Simeonov
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+"""Common fixtures"""
+import pytest
+
+
+@pytest.fixture
+def config_data():
+    """config_data for testing"""
+    return {
+        'general': {
+            'MASTER_PASSWORD_HASH': (
+                'pbkdf2_sha256$100000$kFOQkAPtStZ/Ny/O4501ygHGQnqh5Y+ySxF9qVHr'
+                'iv8=$3BujuWzn3CfDnw4yiD9m3F+GjeW1MHHW40R/ThHNcn0='
+            )
+        },
+        'instances': {
+            'default': {'ETOOLKIT_PROMPT': '(%i)'},
+            'dev': {
+                'ETOOLKIT_PARENT': 'default',
+                'PYTHONPATH': ':/home/user/.pythonpath',
+                'DB_CONNECTION': (
+                    'enc-val$1$Y/TBb1F3siHTw6qZg9ERzZfA8PLPf2CwGSQLpu9jYWw=$FT'
+                    '5tS9o+ABvsxogIXpJim16Gz5SVtV8='
+                ),
+            },
+            'secret': {
+                'ETOOLKIT_PARENT': 'default',
+                'ETOOLKIT_SENSITIVE': ['PASSWORD'],
+                'GNUPGHOME': '%h/private/.gnupg',
+                'PASSWORD': (
+                    'enc-val$1$vIBcoCNiYrsDLtF41uLuSEnppBjhliD0B8jwcBJcj/c=$Kw'
+                    'OGe/y1dlxktDaCnJPIVNuaQ4Q7yNo='
+                ),
+            },
+        },
+    }
+
+
+@pytest.fixture
+def password_hash():
+    """password hash for testing, corresponding to 'the very secret passwd'"""
+    return (
+        'pbkdf2_sha256$100000$kFOQkAPtStZ/Ny/O4501ygHGQnqh5Y+ySxF9qVHr'
+        'iv8=$3BujuWzn3CfDnw4yiD9m3F+GjeW1MHHW40R/ThHNcn0='
+    )
diff --git a/tests/test_cli.py b/tests/test_cli.py
new file mode 100644
index 0000000..1bd9be1
--- /dev/null
+++ b/tests/test_cli.py
@@ -0,0 +1,40 @@
+# etoolkit
+# Copyright (C) 2021 Simeon Simeonov
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+"""Tests for the CLI (etoolkit.__main__"""
+import pytest
+
+import etoolkit
+from etoolkit.__main__ import main
+
+
+def test_help(capsys):
+    """Dummy test checking if the CLI is available at all"""
+    with pytest.raises(SystemExit) as exit_info:
+        main(['-h'])
+    assert exit_info.type == SystemExit
+    assert exit_info.value.code == 0
+    assert capsys.readouterr().out.startswith('usage: etoolkit')
+
+
+def test_version(capsys):
+    """Dummy test checking if the CLI is available at all"""
+    with pytest.raises(SystemExit) as exit_info:
+        main(['-v'])
+    assert exit_info.type == SystemExit
+    assert exit_info.value.code == 0
+    assert capsys.readouterr().out.startswith(
+        f'etoolkit {etoolkit.__version__}'
+    )
diff --git a/tests/test_envtoolkit_instance.py b/tests/test_envtoolkit_instance.py
new file mode 100644
index 0000000..2ffacd2
--- /dev/null
+++ b/tests/test_envtoolkit_instance.py
@@ -0,0 +1,64 @@
+# etoolkit
+# Copyright (C) 2021 Simeon Simeonov
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+"""Tests for etoolkit.EtoolkitInstance"""
+import pytest
+
+import etoolkit
+
+
+def test_instantiation(config_data, password_hash):
+    """Tests for object instatiation"""
+    with pytest.raises(etoolkit.EtoolkitInstanceError) as exc_info:
+        instance = etoolkit.EtoolkitInstance('devv', config_data)
+    assert exc_info.type is etoolkit.EtoolkitInstanceError
+    assert exc_info.value.args[0] == 'Unknown instance "devv"'
+
+    instance = etoolkit.EtoolkitInstance('secret', config_data)
+    assert 'ETOOLKIT_PARENT' not in instance.raw_env_variables
+    assert 'ETOOLKIT_SENSITIVE' not in instance.raw_env_variables
+    assert 'DB_CONNECTION' not in instance.sensitive_env_variables
+    assert 'PASSWORD' in instance.sensitive_env_variables
+    assert instance.name == 'secret'
+    assert instance.master_password_hash == password_hash
+    assert instance.master_password is None
+
+
+def test_get_environ(config_data):
+    """Tests the EtoolkitInstance.get_environ method"""
+    instance = etoolkit.EtoolkitInstance('secret', config_data)
+    with pytest.raises(etoolkit.EtoolkitInstanceError) as exc_info:
+        env = instance.get_environ()
+    assert exc_info.type is etoolkit.EtoolkitInstanceError
+    assert exc_info.value.args[0] == 'Neither password or prompt function set'
+
+    instance.master_password = 'The very secret passwd'  # wrong passwd
+    with pytest.raises(etoolkit.EtoolkitInstanceError) as exc_info:
+        env = instance.get_environ()
+    assert exc_info.type is etoolkit.EtoolkitInstanceError
+    assert exc_info.value.args[0].startswith(
+        'Invalid tag when decrypting: enc-val$'
+    )
+
+    instance.master_password = 'the very secret passwd'  # correct passwd
+    env = instance.get_environ()
+    assert isinstance(env, dict)
+    assert env['PASSWORD'] == 'secret2'
+
+
+def test_get_full_name(config_data):
+    """Tests the EtoolkitInstance.get_full_name method"""
+    instance = etoolkit.EtoolkitInstance('secret', config_data)
+    assert instance.get_full_name('->') == 'default->secret'
diff --git a/tests/test_envtoolkit_instance_static.py b/tests/test_envtoolkit_instance_static.py
new file mode 100644
index 0000000..d7ac857
--- /dev/null
+++ b/tests/test_envtoolkit_instance_static.py
@@ -0,0 +1,102 @@
+# etoolkit
+# Copyright (C) 2021 Simeon Simeonov
+
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+"""Tests for etoolkit.EtoolkitInstance static methods"""
+import unittest.mock
+
+import pytest
+
+import etoolkit
+
+
+@unittest.mock.patch('getpass.getpass')
+def test_confirm_password_prompt(getpass, password_hash):
+    """Tests the static EtoolkitInstance.confirm_password_prompt method"""
+    getpass.return_value = 'the very secret passwd'
+    assert (
+        etoolkit.EtoolkitInstance.confirm_password_prompt(password_hash)
+        == 'the very secret passwd'
+    )
+    assert (
+        etoolkit.EtoolkitInstance.confirm_password_prompt(password_hash, False)
+        == 'the very secret passwd'
+    )
+
+
+def test_decrypt():
+    """Tests the static EtoolkitInstance.decrypt method"""
+    assert (
+        etoolkit.EtoolkitInstance.decrypt(
+            'the very secret passwd',
+            (
+                'enc-val$1$Y/TBb1F3siHTw6qZg9ERzZfA8PLPf2CwGSQLpu9jYWw=$FT5tS9'
+                'o+ABvsxogIXpJim16Gz5SVtV8='
+            ),
+        )
+        == 'secret1'
+    )
+
+    # now test with modified edata
+    with pytest.raises(etoolkit.EtoolkitInstanceError) as exc_info:
+        edata = (
+            'enc-val$1$Y/TBb1F3siHTw6qZg9ERzZfA8PLPf2CwGSQLpu9jYWw=$FT5tS9'
+            'o+ABvsxogIXpJim17Gz5SVtV8='
+        )
+        etoolkit.EtoolkitInstance.decrypt(
+            'the very secret passwd', edata
+        ) == 'secret1'
+    assert exc_info.type is etoolkit.EtoolkitInstanceError
+    assert exc_info.value.args[0] == f'Invalid tag when decrypting: {edata}'
+
+
+def test_encrypt():
+    """Tests the static EtoolkitInstance.encrypt method"""
+    edata = etoolkit.EtoolkitInstance.encrypt('foo', 'bar')
+    assert edata.startswith('enc-val$')
+    assert len(edata) == 83
+    # the edata should always be different because of random salting
+    assert edata != etoolkit.EtoolkitInstance.encrypt('foo', 'bar')
+
+
+def test_get_new_password_hash():
+    """Tests the static EtoolkitInstance.get_new_password_hash method"""
+    new_hash = etoolkit.EtoolkitInstance.get_new_password_hash(
+        'the very secret passwd'
+    )
+    # all pbkdf2 params are the same / hardcoded for the time being
+    assert new_hash.startswith('pbkdf2_sha256$100000$')
+    assert len(new_hash) == 110
+    # the hash should always be different because of random salting
+    assert new_hash != etoolkit.EtoolkitInstance.get_new_password_hash(
+        'the very secret passwd'
+    )
+
+
+def test_parse_value():
+    """Tests the static EtoolkitInstance.parse_value method"""
+    assert (
+        etoolkit.EtoolkitInstance.parse_value('t%bs%t', {'%b': 'e', '%t': 't'})
+        == 'test'
+    )
+
+
+def test_password_matches(password_hash):
+    """Tests the static EtoolkitInstance.password_matches method"""
+    assert etoolkit.EtoolkitInstance.password_matches(
+        'the very secret passwd', password_hash
+    )
+    assert not etoolkit.EtoolkitInstance.password_matches(
+        'the very secret passwdo', password_hash
+    )