add keepass csv export; improve hotp

- export to dedicated totp and hotp csv files for KeePass
- show Typ as totp/hotp instead of OTP_TOTP/OTP_HOTP
  (BREAKING CHANGE in csv, json and stdout, qr codes or urls are not affected)
- add hotp example
- add hotp tests
- export counter for hotp to csv and json files
- add section on KeePass to README
- increase protobuf to 4.21.10
- show file names of exported csv or json files

README.md

@@ -3,14 +3,14 @@
 [![CI Status](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci.yml/badge.svg)](https://github.com/scito/extract_otp_secret_keys/actions/workflows/ci.yml)
 ![PyPI - Python Version](https://img.shields.io/pypi/pyversions/protobuf)
 [![GitHub Pipenv locked Python version](https://img.shields.io/github/pipenv/locked/python-version/scito/extract_otp_secret_keys)](https://github.com/scito/extract_otp_secret_keys/blob/master/Pipfile.lock)
-![protobuf version](https://img.shields.io/badge/protobuf-4.21.9-informational)
+![protobuf version](https://img.shields.io/badge/protobuf-4.21.10-informational)
 [![License](https://img.shields.io/github/license/scito/extract_otp_secret_keys)](https://github.com/scito/extract_otp_secret_keys/blob/master/LICENSE)
 [![GitHub tag (latest SemVer)](https://img.shields.io/github/v/tag/scito/extract_otp_secret_keys?sort=semver&label=version)](https://github.com/scito/extract_otp_secret_keys/tags)
 [![Stand With Ukraine](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/badges/StandWithUkraine.svg)](https://stand-with-ukraine.pp.ua)
 
 ---
 
-Extract two-factor authentication (2FA, TFA) secret keys from export QR codes of "Google Authenticator" app.
+Extract two-factor authentication (2FA, TFA, one time passwords, otp) secret keys from export QR codes of "Google Authenticator" app.
 The secret and otp values can be printed and exported to json or csv. The QR codes can be printed or saved as PNG images.
 
 ## Usage
@@ -26,19 +26,20 @@ The secret and otp values can be printed and exported to json or csv. The QR cod
 
 ## Program help: arguments and options
 
-<pre>usage: extract_otp_secret_keys.py [-h] [--json FILE] [--csv FILE] [--printqr] [--saveqr DIR] [--verbose] [--quiet] infile
+<pre>usage: extract_otp_secret_keys.py [-h] [--json FILE] [--csv FILE] [--keepass FILE] [--printqr] [--saveqr DIR] [--verbose] [--quiet] infile
 
 positional arguments:
-  infile                file or - for stdin (default: -) with "otpauth-migration://..." URLs separated by newlines, lines starting with # are ignored
+  infile                   file or - for stdin (default: -) with "otpauth-migration://..." URLs separated by newlines, lines starting with # are ignored
 
 options:
-  -h, --help            show this help message and exit
-  --json FILE, -j FILE  export to json file
-  --csv FILE, -c FILE   export to csv file
-  --printqr, -p         print QR code(s) as text to the terminal (requires qrcode module)
-  --saveqr DIR, -s DIR  save QR code(s) as images to the given folder (requires qrcode module)
-  --verbose, -v         verbose output
-  --quiet, -q           no stdout output</pre>
+  -h, --help               show this help message and exit
+  --json FILE, -j FILE     export json file
+  --csv FILE, -c FILE      export csv file
+  --keepass FILE, -k FILE  export totp/hotp csv file(s) for KeePass
+  --printqr, -p            print QR code(s) as text to the terminal (requires qrcode module)
+  --saveqr DIR, -s DIR     save QR code(s) as images to the given folder (requires qrcode module)
+  --verbose, -v            verbose output
+  --quiet, -q              no stdout output</pre>
 
 ## Dependencies
 
@@ -47,7 +48,7 @@ options:
 Known to work with
 
 * Python 3.10.8, protobuf 4.21.9, qrcode 7.3.1, and pillow 9.2
-* Python 3.11.0, protobuf 4.21.9, qrcode 7.3.1, and pillow 9.2
+* Python 3.11.0, protobuf 4.21.10, qrcode 7.3.1, and pillow 9.2
 
 For protobuf versions 3.14.0 or similar or Python 3.6, use the extract_otp_secret_keys version 1.4.0.
 
@@ -57,6 +58,44 @@ For printing QR codes, the qrcode module is required, otherwise it can be omitte
 
     pip install qrcode[pil]
 
+## KeePass
+
+[KeePass 2.51](https://keepass.info/news/n220506_2.51.html) (released in May 2022) and newer [support the generation of OTPs (TOTP and HOTP)](https://keepass.info/help/base/placeholders.html#otp).
+
+KeePass can generate the second factor password (2FA) if the OTP secret is stored in `TimeOtp-Secret-Base32` string field for TOTP or `HmacOtp-Secret-Base32` string field for HOTP. You view or edit them in entry dialog on the 'Advanced' tab page.
+
+KeePass provides menu commands in the main window for generating one-time passwords ('Copy HMAC-Based OTP', 'Show HMAC-Based OTP', 'Copy Time-Based OTP', 'Show Time-Based OTP'). Furthermore, one-time passwords can be generated during auto-type using the {HMACOTP} and {TIMEOTP} placeholders.
+
+In order to simplify the usage of the second factor password generation in KeePass a specific KeePass CSV export is available with option `-keepass` or `-k`. This KeePass CSV file can be imported by the ["Generic CSV Importer" of KeePass](https://keepass.info/help/kb/imp_csv.html).
+
+If TOTP and HOTP entries have to be exported, then two files with an intermediate suffix .totp or .hotp will be added to the KeePass export filename.
+
+Example:
+- Only TOTP entries to export and parameter --keepass example_keepass_output.csv<br>
+    → example_keepass_output.csv with TOTP entries will be exported
+- Only HOTP entries to export and parameter --keepass example_keepass_output.csv<br>
+    → example_keepass_output.csv with HOTP entries will be exported
+- If both TOTP and HOTP entries to export and parameter --keepass example_keepass_output.csv<br>
+    → example_keepass_output.totp.csv with TOTP entries will be exported<br>
+    → example_keepass_output.hotp.csv with HOTP entries will be exported
+
+Import CSV with TOTP entries in KeePass as
+
+- Title
+- User Name
+- String (TimeOtp-Secret-Base32)
+- Group (/)
+
+Import CSV with HOTP entries in KeePass as
+
+- Title
+- User Name
+- String (HmacOtp-Secret-Base32)
+- String (HmacOtp-Counter)
+- Group (/)
+
+KeePass can be used as a backup for one time passwords (second factor) from the mobile phone.
+
 ## Technical background
 
 The export QR code of "Google Authenticator" contains the URL `otpauth-migration://offline?data=...`.
@@ -66,7 +105,7 @@ Command for regeneration of Python code from proto3 message definition file (onl
 
     protoc --python_out=protobuf_generated_python google_auth.proto
 
-The generated protobuf Python code was generated by protoc 21.9 (https://github.com/protocolbuffers/protobuf/releases/tag/v21.9).
+The generated protobuf Python code was generated by protoc 21.10 (https://github.com/protocolbuffers/protobuf/releases/tag/v21.10).
 
 ## References