The constant-time ECC implementation in Java was introduced under JDK-8208698, first in JDK 12 and later in JDK 15.

Currently, there are no known intrinsics implemented for these curves, with the exception of:

PR #18583 – Intel x64

PR #23719 – Intel AVX2

Action:
Benchmark the NIST Suite B curves (P-256, P-384, P-521) using:

NSS native implementation

Java constant-time implementation

The goal is to identify performance gaps and determine where additional intrinsics may be beneficial.