[Webkit-unassigned] [Bug 279963] [WebCrypto] JWK import / export round-trip fails in X25519

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=279963

--- Comment #1 from Javier Fernandez <jfernandez at igalia.com> ---
The problem seems to be the public key set to the 'x' attribute:

<   x: HPKx5gIuxTc3Htf1PlT6EVTYPpjrZOpR-uWzMHz-lwY
>   x: hbrW0bCab1ERDBqLWuWTwnQLzwZcuzYSiYsyGkVcT8A

This bug happens only in the Mac port; the Gtk+ port produces a successfully round-trip operation. 

Looking that the code, the JWK export operation in X25519 calls to generateJwkX() function [1], which generates the public key bytes from the private key material. 


    auto* di = ccsha512_di();
    ccec25519pubkey publicKey;
    cced25519_make_pub(di, publicKey, m_data.data());

The result of this operation is different than the original public key previously imported.

[1] https://github.com/WebKit/WebKit/blob/2d09e4618e7a51850fd9095f908b7683d4c9b7d9/Source/WebCore/crypto/cocoa/CryptoKeyOKPCocoa.cpp#L376

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