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61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
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#ifndef SPX_UTILS_H
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#define SPX_UTILS_H
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#include "params.h"
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#include <stddef.h>
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#include <stdint.h>
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/**
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* Converts the value of 'in' to 'outlen' bytes in big-endian byte order.
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*/
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void PQCLEAN_SPHINCSSHAKE256192SROBUST_CLEAN_ull_to_bytes(
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unsigned char *out, size_t outlen, unsigned long long in);
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/**
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* Converts the inlen bytes in 'in' from big-endian byte order to an integer.
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*/
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unsigned long long PQCLEAN_SPHINCSSHAKE256192SROBUST_CLEAN_bytes_to_ull(
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const unsigned char *in, size_t inlen);
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/**
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* Computes a root node given a leaf and an auth path.
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* Expects address to be complete other than the tree_height and tree_index.
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*/
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void PQCLEAN_SPHINCSSHAKE256192SROBUST_CLEAN_compute_root(
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unsigned char *root, const unsigned char *leaf,
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uint32_t leaf_idx, uint32_t idx_offset,
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const unsigned char *auth_path, uint32_t tree_height,
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const unsigned char *pub_seed, uint32_t addr[8]);
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/**
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* For a given leaf index, computes the authentication path and the resulting
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* root node using Merkle's TreeHash algorithm.
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* Expects the layer and tree parts of the tree_addr to be set, as well as the
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* tree type (i.e. SPX_ADDR_TYPE_HASHTREE or SPX_ADDR_TYPE_FORSTREE).
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* Applies the offset idx_offset to indices before building addresses, so that
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* it is possible to continue counting indices across trees.
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*/
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void PQCLEAN_SPHINCSSHAKE256192SROBUST_CLEAN_treehash_FORS_HEIGHT(
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unsigned char *root, unsigned char *auth_path,
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const unsigned char *sk_seed, const unsigned char *pub_seed,
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uint32_t leaf_idx, uint32_t idx_offset,
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void (*gen_leaf)(
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unsigned char * /* leaf */,
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const unsigned char * /* sk_seed */,
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const unsigned char * /* pub_seed */,
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uint32_t /* addr_idx */, const uint32_t[8] /* tree_addr */),
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uint32_t tree_addr[8]);
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void PQCLEAN_SPHINCSSHAKE256192SROBUST_CLEAN_treehash_TREE_HEIGHT(
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unsigned char *root, unsigned char *auth_path,
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const unsigned char *sk_seed, const unsigned char *pub_seed,
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uint32_t leaf_idx, uint32_t idx_offset,
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void (*gen_leaf)(
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unsigned char * /* leaf */,
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const unsigned char * /* sk_seed */,
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const unsigned char * /* pub_seed */,
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uint32_t /* addr_idx */, const uint32_t[8] /* tree_addr */),
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uint32_t tree_addr[8]);
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#endif
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