RFR: 8297972: Poly1305 Endianness on ByteBuffer not enforced [v2]

[Volodymyr Paprotski]

> Per rfc7539 Section 2.5, "Read the block as a little-endian number."
> 
> sun.security.util.math.intpoly.IntegerPolynomial1305 enforces this on input when input is provided as `[]byte` but not when input is in `ByteBuffer`
> 
> Tested with `Poly1305IntrinsicFuzzTest.java` from https://github.com/openjdk/jdk/pull/11338 which compares Poly1305 MAC between `ByteBuffer` and `[]byte`

Volodymyr Paprotski has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - remove workaround from test
 - Merge remote-tracking branch 'origin/master' into endian-poly1305
 - enforce reading input as little_endian numbers

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/11463/files
  - new: https://git.openjdk.org/jdk/pull/11463/files/db17dd19..e21c845b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11463&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11463&range=00-01

  Stats: 119592 lines in 3135 files changed: 60780 ins; 42414 del; 16398 mod
  Patch: https://git.openjdk.org/jdk/pull/11463.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11463/head:pull/11463

PR: https://git.openjdk.org/jdk/pull/11463