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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
68 lines
1.8 KiB
Markdown
68 lines
1.8 KiB
Markdown
# API Reference: Implementing AES Encryption for Data at Rest
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## cryptography Library - AESGCM
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```python
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from cryptography.hazmat.primitives.ciphers.aead import AESGCM
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import os
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key = AESGCM.generate_key(bit_length=256)
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aesgcm = AESGCM(key)
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nonce = os.urandom(12) # 96-bit nonce, NEVER reuse
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ciphertext = aesgcm.encrypt(nonce, plaintext, associated_data)
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plaintext = aesgcm.decrypt(nonce, ciphertext, associated_data)
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```
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## Key Derivation - PBKDF2
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```python
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from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
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from cryptography.hazmat.primitives import hashes
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kdf = PBKDF2HMAC(
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algorithm=hashes.SHA256(),
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length=32, # 256-bit key
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salt=os.urandom(16),
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iterations=600_000, # NIST 2024 recommendation
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)
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key = kdf.derive(password.encode())
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```
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## Encrypted File Format
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```
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[salt: 16 bytes][nonce: 12 bytes][ciphertext + tag: variable]
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```
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| Field | Size | Purpose |
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|-------|------|---------|
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| Salt | 16 bytes | PBKDF2 salt (random per file) |
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| Nonce | 12 bytes | GCM nonce (random per encryption) |
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| Ciphertext | Variable | Encrypted data + 16-byte auth tag |
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## AES Modes Comparison
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| Mode | AEAD | Nonce Size | Use Case |
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|------|------|------------|----------|
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| GCM | Yes | 12 bytes | File/network encryption |
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| CBC | No | 16 bytes | Legacy, disk encryption |
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| CTR | No | 16 bytes | Streaming |
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| XTS | No | 16 bytes | Full disk encryption |
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## Fernet (High-Level API)
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```python
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from cryptography.fernet import Fernet
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key = Fernet.generate_key()
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f = Fernet(key)
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token = f.encrypt(b"data")
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plaintext = f.decrypt(token)
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```
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### References
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- cryptography AESGCM: https://cryptography.io/en/latest/hazmat/primitives/aead/
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- NIST SP 800-38D (GCM): https://csrc.nist.gov/publications/detail/sp/800-38d/final
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- NIST FIPS 197 (AES): https://csrc.nist.gov/publications/detail/fips/197/final
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