Re: [PATCH net-next 1/4] siphash: add cryptographically secure PRF

[Jason A. Donenfeld]

On Thu, Jan 12, 2017 at 4:04 PM, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> wrote:
>> typedef struct {
>>        u64 v[2];
>> } siphash_key_t;
>
> If it's just an 128-bit value then we have u128 in crypto/b128ops.h
> that could be generalised for this.

Nope, it's actually two 64-bit values. Yes, the user fills it in as
one blob to get_random_bytes, but it's used internally by the
algorithm as two distinct variables (which conveniently fit into
64-bit registers).