To be precise, #W3C WebCrypto is not used and can't really be used in DRM because the key material is in local storage. Curve25519 was not added due to lack of support by Mozilla and Microsoft, this will likely be fixed shortly.
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It has unextractable keys that can be stored in IndexedDB, no?
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Yes, the unextractable keys can be stored in IndexedDB and are not accessible by the server, although you still have to trust the server JS to not change their property to "extractable". And needs security audits...
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A long time ago
@trevp__ spec'ed out Curve 25519 DH, and I believe it will be supported fairly soon once some IETF work is done. Mozilla is working on edDSA supporrt. No Microsoft support for Curve25519 coming it appears. https://www.w3.org/2012/webcrypto/WebCryptoCurve25519/Curve25519-WebCrypto.html …
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What do you have against libsodium? It’s just a (very good) crypto library.
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