georgwallisch
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+MIT License
+
+Copyright (c) 2026 Georg Wallisch
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
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+# gwtools
+
+Small security-focused command-line utilities.
+
+Currently included:
+
+- `gwpgen.py` – entropy-driven, cryptographically sound password generator
+
+---
+
+## gwpgen – Entropy-Driven Password Generator
+
+`gwpgen` is a cryptographically clean password generator designed with
+a strict focus on:
+
+- measurable entropy instead of arbitrary complexity rules
+- unbiased random selection (rejection sampling)
+- bias-free Fisher–Yates shuffle
+- explicit character class enforcement
+- reproducible entropy targets (e.g. 100-bit, 256-bit)
+
+The design goal is not “memorable passwords” but mathematically
+well-defined randomness suitable for:
+
+- WPA/WPA3 PSKs
+- API keys
+- device provisioning
+- offline secrets
+- infrastructure credentials
+
+---
+
+## Design Principles
+
+### 1. Entropy-Based Length Calculation
+
+Password length is derived from the requested entropy:
+
+
+length = ceil(target_entropy / log2(alphabet_size))
+
+
+No arbitrary length defaults.
+
+---
+
+### 2. Uniform Randomness
+
+Character selection uses rejection sampling to avoid modulo bias.
+
+---
+
+### 3. Bias-Free Shuffle
+
+Class-enforced characters are shuffled using a cryptographically correct
+Fisher–Yates algorithm without modulo bias.
+
+---
+
+### 4. No Policy Theater
+
+No artificial "must contain symbol" rules unless explicitly requested.
+Character classes are enforced only if selected.
+
+---
+
+## Examples
+
+Generate 100-bit alphanumeric password:
+
+
+python3 gwpgen.py --strong --alphanum
+
+MIT License – see LICENSE file.