crypto: x86/chacha20 - Support partial lengths in 8-block AVX2 variant
Add a length argument to the eight block function for AVX2, so the block function may XOR only a partial length of eight blocks. To avoid unnecessary operations, we integrate XORing of the first four blocks in the final lane interleaving; this also avoids some work in the partial lengths path. Signed-off-by: NMartin Willi <martin@strongswan.org> Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
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