feat(encryption): add whole-object AES-GCM encryption and decryption - #985
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BravoNatalie wants to merge 3 commits into
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Return the encoded envelope, its exact protected header bytes, and the selected COSE tag from an internal preparation helper. Keep the public encodeEnvelope interface unchanged
Add scheme 1 encryption with internally generated IVs, COSE Enc_structure AAD, input validation, and the 64 MiB plaintext limit. Snapshot caller-owned inputs across async operations and reject recipients until key wrapping is implemented. Add fixed-vector, mutation-safety, IV-freshness, and size-boundary tests.
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Part of #968
What
Add whole-object AES-256-GCM encryption and decryption with COSE envelope framing. Authentication uses the exact protected-header bytes written to the envelope. Decryption accepts either COSE tag when the caller supplies the CEK directly.
Verification
pnpm test