RFR: 8368841: X25519 implementation differs from the specification in RFC 7748 [v2]

[Shawn M Emery]

On Tue, 17 Feb 2026 20:56:41 GMT, Ben Perez <bperez at openjdk.org> wrote:

>> Our implementation of X25519 does not zero the MSB of the `u` coordinate as required by RFC 7748. Currently the test `jdk/sun/security/ec/xec/TestXDH.java` zeroes the bit manually while parsing test vectors, which is likely why this went uncaught.
>
> Ben Perez has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Copyright update

Can your remove the clearHighBit logic in jdk/sun/security/ec/xec/TestXDH.java with this change now?

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PR Comment: https://git.openjdk.org/jdk/pull/29750#issuecomment-3922609927