mirror of
https://github.com/henrydcase/pqc.git
synced 2024-11-23 07:59:01 +00:00
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
|
#ifndef PQCLEAN_SPHINCSSHA256128SROBUST_AVX2_HASH_STATE_H
|
|||
|
|
#define PQCLEAN_SPHINCSSHA256128SROBUST_AVX2_HASH_STATE_H
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Defines the type of the hash function state.
|
|||
|
|
*
|
|||
|
|
* Don't be fooled into thinking this instance of SPHINCS+ isn't stateless!
|
|||
|
|
*
|
|||
|
|
* From Section 7.2.2 from the SPHINCS+ round-2 specification:
|
|||
|
|
*
|
|||
|
|
* Each of the instances of the tweakable hash function take PK.seed as its
|
|||
|
|
* first input, which is constant for a given key pair – and, thus, across
|
|||
|
|
* a single signature. This leads to a lot of redundant computation. To remedy
|
|||
|
|
* this, we pad PK.seed to the length of a full 64-byte SHA-256 input block.
|
|||
|
|
* Because of the Merkle-Damgård construction that underlies SHA-256, this
|
|||
|
|
* allows for reuse of the intermediate SHA-256 state after the initial call to
|
|||
|
|
* the compression function which improves performance.
|
|||
|
|
*
|
|||
|
|
* We pass this hash state around in functions, because otherwise we need to
|
|||
|
|
* have a global variable.
|
|||
|
|
*
|
|||
|
|
* We use a struct to differentiate between the x1 and x8 variants of SHA256.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
#include "sha2.h"
|
|||
|
|
#include "sha256avx.h"
|
|||
|
|
|
|||
|
|
typedef struct {
|
|||
|
|
sha256ctx x1;
|
|||
|
|
sha256ctxx8 x8;
|
|||
|
|
} hash_state;
|
|||
|
|
|
|||
|
|
#endif
|