RFR: 8320449: ECDHKeyAgreement should validate parameters before using them [v2]

[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 assertThrows on doPhase

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17373/files
  - new: https://git.openjdk.org/jdk/pull/17373/files/8a573464..68a53e89

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17373&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17373&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 1 del; 4 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