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mukul975
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Complete skill folder anatomy across all cybersecurity skills: - scripts/agent.py: 80-150 line Python agents using real libraries (impacket, boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.) - references/api-reference.md: real API documentation with method signatures - LICENSE: MIT license for all skill folders
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1.8 KiB
API Reference: Implementing AES Encryption for Data at Rest
cryptography Library - AESGCM
from cryptography.hazmat.primitives.ciphers.aead import AESGCM
import os
key = AESGCM.generate_key(bit_length=256)
aesgcm = AESGCM(key)
nonce = os.urandom(12) # 96-bit nonce, NEVER reuse
ciphertext = aesgcm.encrypt(nonce, plaintext, associated_data)
plaintext = aesgcm.decrypt(nonce, ciphertext, associated_data)
Key Derivation - PBKDF2
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from cryptography.hazmat.primitives import hashes
kdf = PBKDF2HMAC(
algorithm=hashes.SHA256(),
length=32, # 256-bit key
salt=os.urandom(16),
iterations=600_000, # NIST 2024 recommendation
)
key = kdf.derive(password.encode())
Encrypted File Format
[salt: 16 bytes][nonce: 12 bytes][ciphertext + tag: variable]
| Field | Size | Purpose |
|---|---|---|
| Salt | 16 bytes | PBKDF2 salt (random per file) |
| Nonce | 12 bytes | GCM nonce (random per encryption) |
| Ciphertext | Variable | Encrypted data + 16-byte auth tag |
AES Modes Comparison
| Mode | AEAD | Nonce Size | Use Case |
|---|---|---|---|
| GCM | Yes | 12 bytes | File/network encryption |
| CBC | No | 16 bytes | Legacy, disk encryption |
| CTR | No | 16 bytes | Streaming |
| XTS | No | 16 bytes | Full disk encryption |
Fernet (High-Level API)
from cryptography.fernet import Fernet
key = Fernet.generate_key()
f = Fernet(key)
token = f.encrypt(b"data")
plaintext = f.decrypt(token)
References
- cryptography AESGCM: https://cryptography.io/en/latest/hazmat/primitives/aead/
- NIST SP 800-38D (GCM): https://csrc.nist.gov/publications/detail/sp/800-38d/final
- NIST FIPS 197 (AES): https://csrc.nist.gov/publications/detail/fips/197/final