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50 lines
1.9 KiB
Markdown
50 lines
1.9 KiB
Markdown
# API Reference — Implementing Envelope Encryption with AWS KMS
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## Libraries Used
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- **boto3**: AWS SDK for KMS key management and data key generation
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- **cryptography**: AES-256-GCM for local data encryption with generated data keys
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## CLI Interface
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```
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python agent.py --region us-east-1 encrypt --input <file> --output <out> --key-id <kms_key>
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python agent.py --region us-east-1 decrypt --input <encrypted> --output <out>
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python agent.py --region us-east-1 list-keys
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python agent.py --region us-east-1 audit --key-id <kms_key>
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```
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## Core Functions
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### `generate_data_key(kms_key_id, region)`
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Generates a data encryption key (DEK) using AWS KMS.
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- `kms.generate_data_key(KeyId=key_id, KeySpec="AES_256")`
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- Returns plaintext key (for local encryption) and encrypted key (for storage).
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### `encrypt_data(plaintext_bytes, kms_key_id, region)`
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Performs envelope encryption: generates DEK via KMS, encrypts data locally with AES-256-GCM, stores encrypted DEK alongside ciphertext.
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### `decrypt_data(envelope, region)`
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Decrypts envelope: calls `kms.decrypt(CiphertextBlob=encrypted_key)` to recover DEK, then decrypts data locally.
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### `list_kms_keys(region)`
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Lists KMS keys with metadata using `kms.list_keys()` and `kms.describe_key()`.
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### `audit_key_policy(key_id, region)`
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Audits KMS key policy for overly permissive principals (`Principal: "*"`).
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- `kms.get_key_policy(KeyId=key_id, PolicyName="default")`
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## boto3 KMS API Calls
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| Method | Purpose |
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|--------|---------|
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| `kms.generate_data_key(KeyId, KeySpec)` | Generate plaintext + encrypted DEK |
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| `kms.decrypt(CiphertextBlob)` | Decrypt encrypted DEK back to plaintext |
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| `kms.list_keys()` | List all KMS keys in the account |
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| `kms.describe_key(KeyId)` | Get key metadata (state, usage, origin) |
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| `kms.get_key_policy(KeyId, PolicyName)` | Get key resource policy JSON |
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## Dependencies
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```
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pip install boto3>=1.28 cryptography>=41.0
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```
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