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How to Mock KMS Envelope Encryption in Python

Demonstrates a minimal mock of AWS KMS envelope encryption flow with AES-GCM data key wrapping and unwrapping.

import base64
import json
import os
import hashlib


class MockKMS:
    """Minimal mock of AWS KMS envelope encryption flow."""

    def generate_data_key(self):
        # Simulate KMS returning a plaintext and encrypted data key
        plaintext_key = os.urandom(32)
        encrypted_key = hashlib.sha256(plaintext_k…

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