crypto: x86/nhpoly1305 - add SSE2 accelerated NHPoly1305
Add a 64-bit SSE2 implementation of NHPoly1305, an ε-almost-∆-universal hash function used in the Adiantum encryption mode. For now, only the NH portion is actually SSE2-accelerated; the Poly1305 part is less performance-critical so is just implemented in C. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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