Fix AES-GCM-SIV endian issues

Fixes #18911

`BSWAP`x/`GETU`xx are no-ops on big-endian. Change the byte swapper.
Fix big-endian issues in the `mulx_ghash()` function

Rev

Fix AES-GCM-SIV endian issues

Fixes #18911

`BSWAP`x/`GETU`xx are no-ops on big-endian. Change the byte swapper.
Fix big-endian issues in the `mulx_ghash()` function

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18920)

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Implement AES-GCM-SIV (RFC8452)

Fixes #16721

This uses AES-ECB to create a counter mode AES-CTR32 (32bit counter, I could
not get AES-CTR to work as-is), and GHASH to implement

Implement AES-GCM-SIV (RFC8452)

Fixes #16721

This uses AES-ECB to create a counter mode AES-CTR32 (32bit counter, I could
not get AES-CTR to work as-is), and GHASH to implement POLYVAL. Optimally,
there would be separate polyval assembly implementation(s), but the only one
I could find (and it was SSE2 x86_64 code) was not Apache 2.0 licensed.

This implementation lives only in the default provider; there is no legacy
implementation.

The code offered in #16721 is not used; that implementation sits on top of
OpenSSL, this one is embedded inside OpenSSL.

Full test vectors from RFC8452 are included, except the 0 length plaintext;
that is not supported; and I'm not sure it's worthwhile to do so.

Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18693)

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