Javascript – key / certificate from USB Token

It is not possible for now. The WebCryptoApi does not support using keys stored in external keystores like smartcards, Mozilla keystore or Windows KeyStore (used by Chrome and Explorer), and reading the comments of the last conferences, it is not a current priority.

There is another Javascript API specification of W3C to be used with Web Cryptography Api. See WebCrypto Key Discovery

This note describes a JavaScript API for discovering named, origin-specific pre-provisioned cryptographic keys for use with the Web Cryptography API.

Unfortunately is still a working group under development.

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