linux

lib/crypto: nh: Add NH library Add support for the NH "almost-universal hash function" to lib/crypto/, specifically the variant of NH used in Adiantum. This will replace the need for the "nhpoly1305" crypto_shash algorithm. All the implementations of "nhpoly1305" use architecture-optimized code only for the NH stage; they just use the generic C Poly1305 code for the Poly1305 stage. We can achieve the same result in a simpler way using an (architecture-optimized) nh() function combined with code in crypto/adiantum.c that passes the results to the Poly1305 library. This commit begins this cleanup by adding the nh() function. The code is derived from crypto/nhpoly1305.c and include/crypto/nhpoly1305.h. Link: https://lore.kernel.org/r/20251211011846.8179-2-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@kernel.org> 2025-12-10 17:18:33 -08:00