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#ifndef PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_UTILS_H
#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_UTILS_H
#include "hash_state.h"
#include "params.h"
#include <stddef.h>
#include <stdint.h>
/**
* Converts the value of 'in' to 'outlen' bytes in big-endian byte order.
*/
void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ull_to_bytes(
unsigned char *out, size_t outlen, unsigned long long in);
/**
* Converts the inlen bytes in 'in' from big-endian byte order to an integer.
*/
unsigned long long PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_bytes_to_ull(
const unsigned char *in, size_t inlen);
/**
* Computes a root node given a leaf and an auth path.
* Expects address to be complete other than the tree_height and tree_index.
*/
void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_compute_root(
unsigned char *root, const unsigned char *leaf,
uint32_t leaf_idx, uint32_t idx_offset,
const unsigned char *auth_path, uint32_t tree_height,
const unsigned char *pub_seed, uint32_t addr[8],
const hash_state *hash_state_seeded);
/**
* For a given leaf index, computes the authentication path and the resulting
* root node using Merkle's TreeHash algorithm.
* Expects the layer and tree parts of the tree_addr to be set, as well as the
* tree type (i.e. PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ADDR_TYPE_HASHTREE or PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ADDR_TYPE_FORSTREE).
* Applies the offset idx_offset to indices before building addresses, so that
* it is possible to continue counting indices across trees.
*/
void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_treehash_FORS_HEIGHT(
unsigned char *root, unsigned char *auth_path,
const unsigned char *sk_seed, const unsigned char *pub_seed,
uint32_t leaf_idx, uint32_t idx_offset,
void (*gen_leaf)(
unsigned char * /* leaf */,
const unsigned char * /* sk_seed */,
const unsigned char * /* pub_seed */,
uint32_t /* addr_idx */, const uint32_t[8] /* tree_addr */,
const hash_state * /* hash_state_seeded */),
uint32_t tree_addr[8], const hash_state *hash_state_seeded);
void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_treehash_TREE_HEIGHT(
unsigned char *root, unsigned char *auth_path,
const unsigned char *sk_seed, const unsigned char *pub_seed,
uint32_t leaf_idx, uint32_t idx_offset,
void (*gen_leaf)(
unsigned char * /* leaf */,
const unsigned char * /* sk_seed */,
const unsigned char * /* pub_seed */,
uint32_t /* addr_idx */, const uint32_t[8] /* tree_addr */,
const hash_state * /* hash_state_seeded */),
uint32_t tree_addr[8], const hash_state *hash_state_seeded);
#endif
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