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mukul975 c21af3347e Complete folder anatomy for all 649 cybersecurity skills + update LICENSE to Mahipal

- 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

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API Reference — Implementing End-to-End Encryption for Messaging

Libraries Used

cryptography: X25519 key exchange, HKDF key derivation, AES-256-GCM encryption

CLI Interface

python agent.py keygen                                    # Generate X25519 key pair
python agent.py exchange                                  # Simulate key exchange
python agent.py demo                                      # Full E2EE demo flow
python agent.py encrypt --message <text> --key <hex>      # Encrypt message
python agent.py decrypt --nonce <hex> --ciphertext <hex> --key <hex>

Core Functions

`generate_keypair()`

Generates X25519 key pair for Diffie-Hellman key exchange.

X25519PrivateKey.generate() -> private key
private_key.public_key() -> public key
Returns hex-encoded private and public keys.

`derive_shared_secret(my_private_hex, their_public_hex)`

Performs X25519 ECDH key exchange and derives symmetric key via HKDF-SHA256.

my_private.exchange(their_public) -> 32-byte raw shared secret
HKDF(algorithm=SHA256(), length=32, info=b"e2ee-messaging-v1").derive(shared)

`encrypt_message(message, shared_key_hex)`

Encrypts plaintext using AES-256-GCM with random 12-byte nonce.

AESGCM(key).encrypt(nonce, plaintext, None) -> ciphertext with GCM tag

`decrypt_message(nonce_hex, ciphertext_hex, shared_key_hex)`

Decrypts and authenticates ciphertext. Raises InvalidTag if tampered.

Cryptography API Calls

Class	Module	Purpose
`X25519PrivateKey`	`cryptography.hazmat.primitives.asymmetric.x25519`	ECDH private key
`X25519PublicKey`	same	ECDH public key
`AESGCM`	`cryptography.hazmat.primitives.ciphers.aead`	Authenticated encryption
`HKDF`	`cryptography.hazmat.primitives.kdf.hkdf`	Key derivation

Dependencies

pip install cryptography>=41.0

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