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Services/KeyExchange: Difference between revisions
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<li>Mobile and Desktop complete the two roundtrips of JPAKE messages to agree upon a secret key.</li> | <li>Mobile and Desktop complete the two roundtrips of JPAKE messages to agree upon a secret key.</li> | ||
<li>The secret key is the sha256 hash of the K number, as returned by python-jpake.</li> | <li>The secret key is the sha256 hash of the K number, as returned by python-jpake.</li> | ||
<li>In third round trip | <li>The encryption key is <code>SHA256("encrypt:" + key)</code>, the HMAC key is <code>SHA256("hmac:" + key)</code> </li> | ||
<li>In third round trip: | |||
<ul><li>Mobile hashes the key using SHA256d (=hash twice with SHA256) and uploads it.</li> | |||
<li>Desktop verifies it against its key, encrypts the credentials with the encryption key and uploads the encrypted credentials in turn, adding a SHA256-HMAC hash of the ciphertext (using the HMAC key).</li> | |||
<li>Mobile verifies whether Desktop had the right key by checking the ciphertext against the SHA256-HMAC hash.</li> | |||
</ul></li> | |||
</ul> | </ul> | ||