RFR: 8320449: ECDHKeyAgreement should validate parameters before using them [v4]

[John Jiang]

> ECDHKeyAgreement should validate the parameters before assigning them to the fields.

John Jiang has updated the pull request incrementally with one additional commit since the last revision:

  more check on generateSecret

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/17373/files
  - new: https://git.openjdk.org/jdk/pull/17373/files/9a326117..2eb5fb41

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17373&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17373&range=02-03

  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17373.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17373/head:pull/17373

PR: https://git.openjdk.org/jdk/pull/17373