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

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API Reference — Implementing Envelope Encryption with AWS KMS

Libraries Used

boto3: AWS SDK for KMS key management and data key generation
cryptography: AES-256-GCM for local data encryption with generated data keys

CLI Interface

python agent.py --region us-east-1 encrypt --input <file> --output <out> --key-id <kms_key>
python agent.py --region us-east-1 decrypt --input <encrypted> --output <out>
python agent.py --region us-east-1 list-keys
python agent.py --region us-east-1 audit --key-id <kms_key>

Core Functions

`generate_data_key(kms_key_id, region)`

Generates a data encryption key (DEK) using AWS KMS.

kms.generate_data_key(KeyId=key_id, KeySpec="AES_256")
Returns plaintext key (for local encryption) and encrypted key (for storage).

`encrypt_data(plaintext_bytes, kms_key_id, region)`

Performs envelope encryption: generates DEK via KMS, encrypts data locally with AES-256-GCM, stores encrypted DEK alongside ciphertext.

`decrypt_data(envelope, region)`

Decrypts envelope: calls kms.decrypt(CiphertextBlob=encrypted_key) to recover DEK, then decrypts data locally.

`list_kms_keys(region)`

Lists KMS keys with metadata using kms.list_keys() and kms.describe_key().

`audit_key_policy(key_id, region)`

Audits KMS key policy for overly permissive principals (Principal: "*").

kms.get_key_policy(KeyId=key_id, PolicyName="default")

boto3 KMS API Calls

Method	Purpose
`kms.generate_data_key(KeyId, KeySpec)`	Generate plaintext + encrypted DEK
`kms.decrypt(CiphertextBlob)`	Decrypt encrypted DEK back to plaintext
`kms.list_keys()`	List all KMS keys in the account
`kms.describe_key(KeyId)`	Get key metadata (state, usage, origin)
`kms.get_key_policy(KeyId, PolicyName)`	Get key resource policy JSON

Dependencies

pip install boto3>=1.28 cryptography>=41.0

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