sgaip 0.1.3

SGAIP Python Reference Implementation

• Package: sgaip
• Version: 0.1.1 (ready for PyPI)
• License: Apache-2.0
• Python: 3.10+
• Repository: https://github.com/k-kaundal/sgaip
• PyPI: https://pypi.org/project/sgaip/

Overview

sgaip is a production-ready reference implementation of the Stateless Global Agent Identity Protocol (SGAIP).

It provides:

• Core library – deterministic identity derivation, Ed25519 operations
• CLI tool – global sgaip command for key generation, signing, verification
• Full type safety – complete type hints with mypy support
• Comprehensive tests – unit tests with pytest + coverage
• Production quality – linting, formatting, strict type checking

Installation

From PyPI

pip install sgaip

From Source

git clone https://github.com/k-kaundal/sgaip.git
cd sgaip/reference/python
pip install -e .

With Development Tools

pip install -e .[dev]

CLI Usage

The sgaip command provides three main operations:

1. Generate a Keypair

sgaip keygen --private agent.sk --public agent.pk

Outputs:

• agent.sk – private key (keep secret!)
• agent.pk – public key
• Derived Agent ID (AID) to console

2. Sign a Message

sgaip sign --private agent.sk --message "Hello, World!"
sgaip sign --private agent.sk --file data.txt --out data.sig

Creates:

• signature.bin (or custom --out file)

3. Verify Offline

sgaip verify --public agent.pk --signature signature.bin --message "Hello, World!"
sgaip verify --public agent.pk --signature data.sig --file data.txt

Prints:

• ✅ Signature validity
• Derived Agent ID (AID)

All operations work completely offline – no internet required.

Python API

Basic Usage

from sgaip import (
    generate_keypair,
    serialize_public_key,
    derive_agent_id,
    sign_challenge,
    verify_proof,
)

# Generate identity
private_key, public_key = generate_keypair()
public_bytes = serialize_public_key(public_key)

# Derive Agent Identity
aid = derive_agent_id(public_bytes)
print(f"Agent ID: {aid}")

# Sign a challenge
challenge = b"verifier-challenge-123"
signature = sign_challenge(private_key, challenge)

# Verify offline
is_valid = verify_proof(public_bytes, challenge, signature, expected_aid=aid)
assert is_valid

Advanced: Import from Package

import sgaip

# All public functions available
print(sgaip.__version__)
keypair = sgaip.generate_keypair()
aid = sgaip.derive_agent_id(sgaip.serialize_public_key(keypair[1]))

Development

Setup

cd sgaip/reference/python
python -m venv venv
source venv/bin/activate
pip install -e .[dev]

Testing

# Run all tests
pytest tests/

# With coverage
pytest tests/ --cov=sgaip --cov-report=html

# Watch mode
pytest-watch tests/

Linting & Formatting

# Format code
black sgaip/ tests/ bin/

# Check style
black --check sgaip/ tests/

# Lint with ruff
ruff check sgaip/ tests/
ruff check --fix sgaip/ tests/

# Type check
mypy sgaip/

Running Individual Commands

# Keygen
python -m sgaip keygen --private test.sk --public test.pk

# Sign
python -m sgaip sign --private test.sk --message "test"

# Verify
python -m sgaip verify --public test.pk --signature signature.bin --message "test"

Security Notes

⚠️ Reference implementation — not security audited.

• Protect private key files (.sk) – anyone with the key controls the identity
• Loss of private key means loss of identity (no recovery mechanism)
• SGAIP provides authentication only, not trust or authorization
• See specs/threat-model.md for detailed security analysis

Specifications

This package implements:

• SGAIP Core Specification
• Identity Derivation
• Proof Protocol

Testing & Interoperability

Python tests verify:

• ✅ Deterministic identity derivation (same AID for same public key)
• ✅ Ed25519 signature scheme correctness
• ✅ Offline verification
• ✅ CLI command handling

Run the full suite:

pytest tests/ --cov=sgaip

Troubleshooting

Issue: ModuleNotFoundError: No module named 'cryptography'

pip install cryptography

Issue: Type checking fails

mypy sgaip/ --ignore-missing-imports

Issue: Tests fail on import

Ensure you've installed in editable mode:

pip install -e .

Contributing

See DEVELOPMENT.md for contribution guidelines.

Key areas for contribution:

• Additional test vectors
• Performance optimizations
• Documentation improvements
• Additional language bindings

License

Apache License 2.0 – see LICENSE

Related Projects

• JavaScript/TypeScript: reference/js/
• Protocol Specification: specs/
• Test Vectors: test-vectors/

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Questions?
Open an issue on GitHub or see GOVERNANCE.md.