Let ECDSA's `engineGetParameters()` always return null. At the same time, remove the remembered `sigParams` field. One behavior change is that after calling `setParameter()`, one can call `init()` again with a key using different parameters. I think this should be allowed since we are reusing the signature object with a brand new key.
`setParameter` is kept unchanged to be able to deal with certificates still having parameters after the signature algorithm object identifier. See https://bugs.openjdk.java.net/browse/JDK-8225745. Also added SHA1withECDSA to the no-NULL list in `KnownOIDs`. ------------- Commit messages: - the fix Changes: https://git.openjdk.java.net/jdk/pull/8758/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8758&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8286908 Stats: 96 lines in 3 files changed: 59 ins; 29 del; 8 mod Patch: https://git.openjdk.java.net/jdk/pull/8758.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8758/head:pull/8758 PR: https://git.openjdk.java.net/jdk/pull/8758
