feat: add EC key wrapping support for TDF3 Archive format#36
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- Add ecWrapped case to AccessType enum in TDFManifest.swift - Implement wrapSymmetricKeyWithEC() using ECIES (ECDH + HKDF + AES-GCM) - Add unwrapSymmetricKeyWithEC() for decryption - Support P-256, P-384, and P-521 curves - Add TDFECCurve enum and ECWrappedKeyResult struct - Add EC public key loading functions for all curves - Update KASRewrapClient with RewrapAlgorithm enum for automatic algorithm detection based on key access type - Add new error cases for EC operations This enables full EC support for TDF3 Archive format, complementing the existing NanoTDF EC support. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
ecWrappedcase toAccessTypeenum in TDFManifest.swiftwrapSymmetricKeyWithEC()using ECIES (ECDH + HKDF + AES-GCM)unwrapSymmetricKeyWithEC()for decryptionTDFECCurveenum andECWrappedKeyResultstructKASRewrapClientwithRewrapAlgorithmenum for automatic algorithm detectionThis enables full EC support for TDF3 Archive format, complementing the existing NanoTDF EC support.
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