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tweak belt-dwp bundled ghash, use polyval as inner - #878

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makavity:tweak-dwp-ghash
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tweak belt-dwp bundled ghash, use polyval as inner#878
makavity wants to merge 4 commits into
RustCrypto:masterfrom
makavity:tweak-dwp-ghash

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 name before.txt ns/iter after.txt ns/iter diff ns/iter diff % speedup decrypt_aad_only_16kb 18,386 (891 MB/s) 1,523 (10757 MB/s) -16,863 -91.72% x 12.07 decrypt_msg_only_16kb 91,471 (179 MB/s) 73,526 (222 MB/s) -17,945 -19.62% x 1.24 encrypt_aad_only_16kb 18,268 (896 MB/s) 1,492 (10981 MB/s) -16,776 -91.83% x 12.24 encrypt_msg_only_16kb 90,306 (181 MB/s) 73,763 (222 MB/s) -16,543 -18.32% x 1.22 

I think, closesRustCrypto/universal-hashes#236

Comment threadbelt-dwp/src/ghash.rs
Comment on lines +16 to +25
/// Convert a block between STB 34.101.31's and NIST SP 800-38D's representations.
///
/// Both standards use the same field, but STB numbers the bits of every byte in the opposite
/// order, so the conversion is a bit reversal within each byte.
#[inline(always)]
fn convert(block: &Block) -> Block {
let x = u128::from_le_bytes((*block).into());
x.reverse_bits().swap_bytes().to_le_bytes().into()
}

@makavitymakavityAug 28, 2026

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@tarcieri you can take a look, what I told you about in RustCrypto/universal-hashes#356

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polyval, ghash: Add flavors for Little Endian and Big Endian

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