On Mon, Dec 19, 2022 at 12:55:53PM -0600, Robert Elliott wrote: > +/** > + * clmul_ghash_mul - Calculate GHASH final multiplication using x86 PCLMULQDQ instructions Well, it does one multiplication. It's not necessarily the final one. > + * @dst: address of hash value to update (%rdi) > + * @shash: address of hash context (%rsi) This terminology is confusing. I would call these the accumulator and key, respectively. > +/** > + * clmul_ghash_update - Calculate GHASH using x86 PCLMULQDQ instructions > + * @dst: address of hash value to update (%rdi) > + * @src: address of data to hash (%rsi) > + * @srclen: number of bytes in data buffer (%rdx); > + * function does nothing and returns if below 16 > + * @shash: address of hash context (%rcx) > + * > + * This supports 64-bit CPUs. > + * > + * Return: none (but @dst is updated) > + * Prototype: asmlinkage clmul_ghash_update(char *dst, const char *src, > + * unsigned int srclen, const u128 *shash); "function does nothing and returns if below 16" => "function processes round_down(srclen, 16) bytes". - Eric
