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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
# API Reference — Implementing End-to-End Encryption for Messaging
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## Libraries Used
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- **cryptography**: X25519 key exchange, HKDF key derivation, AES-256-GCM encryption
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## CLI Interface
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```
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python agent.py keygen # Generate X25519 key pair
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python agent.py exchange # Simulate key exchange
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python agent.py demo # Full E2EE demo flow
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python agent.py encrypt --message <text> --key <hex> # Encrypt message
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python agent.py decrypt --nonce <hex> --ciphertext <hex> --key <hex>
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```
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## Core Functions
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### `generate_keypair()`
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Generates X25519 key pair for Diffie-Hellman key exchange.
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- `X25519PrivateKey.generate()` -> private key
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- `private_key.public_key()` -> public key
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- Returns hex-encoded private and public keys.
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### `derive_shared_secret(my_private_hex, their_public_hex)`
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Performs X25519 ECDH key exchange and derives symmetric key via HKDF-SHA256.
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- `my_private.exchange(their_public)` -> 32-byte raw shared secret
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- `HKDF(algorithm=SHA256(), length=32, info=b"e2ee-messaging-v1").derive(shared)`
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### `encrypt_message(message, shared_key_hex)`
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Encrypts plaintext using AES-256-GCM with random 12-byte nonce.
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- `AESGCM(key).encrypt(nonce, plaintext, None)` -> ciphertext with GCM tag
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### `decrypt_message(nonce_hex, ciphertext_hex, shared_key_hex)`
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Decrypts and authenticates ciphertext. Raises `InvalidTag` if tampered.
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## Cryptography API Calls
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| Class | Module | Purpose |
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|-------|--------|---------|
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| `X25519PrivateKey` | `cryptography.hazmat.primitives.asymmetric.x25519` | ECDH private key |
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| `X25519PublicKey` | same | ECDH public key |
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| `AESGCM` | `cryptography.hazmat.primitives.ciphers.aead` | Authenticated encryption |
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| `HKDF` | `cryptography.hazmat.primitives.kdf.hkdf` | Key derivation |
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## Dependencies
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```
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pip install cryptography>=41.0
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```
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