RFR: 8333867: SHA3 performance can be improved

[Ferenc Rakoczi]

On Mon, 10 Jun 2024 17:25:21 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> This PR removes some unnecessary conversions between byte arrays and long arrays during SHA3 digest computations.
>
> src/java.base/share/classes/sun/security/provider/SHA3.java line 98:
> 
>> 96:     @IntrinsicCandidate
>> 97:     private void implCompress0(byte[] b, int ofs) {
>> 98:         b2lLittle(b, ofs, longBuf, 0, blockSize);
> 
> What about BigEndian machines?

According to the SHA3 algorithm specification, this byte array should be interpreted as a little endian long array. b2lLittle() does just that on both little and big endian machines.

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

PR Review Comment: https://git.openjdk.org/jdk/pull/19632#discussion_r1633606439