ref: 94f2907dc40a6415a10c252cb9ba3971f1f7e838
dir: /third_party/boringssl/src/crypto/spx/spx_params.h/
/* Copyright (c) 2023, Google LLC
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#ifndef OPENSSL_HEADER_CRYPTO_SPX_PARAMS_H
#define OPENSSL_HEADER_CRYPTO_SPX_PARAMS_H
#if defined(__cplusplus)
extern "C" {
#endif
// Output length of the hash function.
#define SPX_N 16
// Total height of the tree structure.
#define SPX_FULL_HEIGHT 63
// Number of subtree layers.
#define SPX_D 7
// Height of the trees on each layer
#define SPX_TREE_HEIGHT 9
// Height of each individual FORS tree.
#define SPX_FORS_HEIGHT 12
// Total number of FORS tree used.
#define SPX_FORS_TREES 14
// Size of a FORS signature
#define SPX_FORS_BYTES ((SPX_FORS_HEIGHT + 1) * SPX_FORS_TREES * SPX_N)
// Winternitz parameter and derived values
#define SPX_WOTS_W 16
#define SPX_WOTS_LOG_W 4
#define SPX_WOTS_LEN1 32
#define SPX_WOTS_LEN2 3
#define SPX_WOTS_LEN 35
#define SPX_WOTS_BYTES (SPX_N * SPX_WOTS_LEN)
// XMSS sizes
#define SPX_XMSS_BYTES (SPX_WOTS_BYTES + (SPX_N * SPX_TREE_HEIGHT))
// Size of the message digest (NOTE: This is only correct for the SHA256 params
// here)
#define SPX_DIGEST_SIZE \
(((SPX_FORS_TREES * SPX_FORS_HEIGHT) / 8) + \
(((SPX_FULL_HEIGHT - SPX_TREE_HEIGHT) / 8) + 1) + (SPX_TREE_HEIGHT / 8) + \
1)
// Compressed address size when using SHA256
#define SPX_SHA256_ADDR_BYTES 22
// Size of the FORS message hash
#define SPX_FORS_MSG_BYTES ((SPX_FORS_HEIGHT * SPX_FORS_TREES + 7) / 8)
#define SPX_TREE_BITS (SPX_TREE_HEIGHT * (SPX_D - 1))
#define SPX_TREE_BYTES ((SPX_TREE_BITS + 7) / 8)
#define SPX_LEAF_BITS SPX_TREE_HEIGHT
#define SPX_LEAF_BYTES ((SPX_LEAF_BITS + 7) / 8)
#if defined(__cplusplus)
} // extern C
#endif
#endif // OPENSSL_HEADER_CRYPTO_SPX_PARAMS_H