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- #ifndef SPX_PARAMS_H
- #define SPX_PARAMS_H
-
- /* Hash output length in bytes. */
- #define SPX_N 32
- /* Height of the hypertree. */
- #define SPX_FULL_HEIGHT 68
- /* Number of subtree layer. */
- #define SPX_D 17
- /* FORS tree dimensions. */
- #define SPX_FORS_HEIGHT 10
- #define SPX_FORS_TREES 30
- /* Winternitz parameter, */
- #define SPX_WOTS_W 16
-
- /* The hash function is defined by linking a different hash.c file, as opposed
- to setting a #define constant. */
-
- /* For clarity */
- #define SPX_ADDR_BYTES 32
-
- /* WOTS parameters. */
- #define SPX_WOTS_LOGW 4
-
- #define SPX_WOTS_LEN1 (8 * SPX_N / SPX_WOTS_LOGW)
-
- /* SPX_WOTS_LEN2 is floor(log(len_1 * (w - 1)) / log(w)) + 1; we precompute */
- #define SPX_WOTS_LEN2 3
-
- #define SPX_WOTS_LEN (SPX_WOTS_LEN1 + SPX_WOTS_LEN2)
- #define SPX_WOTS_BYTES (SPX_WOTS_LEN * SPX_N)
- #define SPX_WOTS_PK_BYTES SPX_WOTS_BYTES
-
- /* Subtree size. */
- #define SPX_TREE_HEIGHT (SPX_FULL_HEIGHT / SPX_D)
-
- /* FORS parameters. */
- #define SPX_FORS_MSG_BYTES ((SPX_FORS_HEIGHT * SPX_FORS_TREES + 7) / 8)
- #define SPX_FORS_BYTES ((SPX_FORS_HEIGHT + 1) * SPX_FORS_TREES * SPX_N)
- #define SPX_FORS_PK_BYTES SPX_N
-
- /* Resulting SPX sizes. */
- #define SPX_BYTES (SPX_N + SPX_FORS_BYTES + SPX_D * SPX_WOTS_BYTES +\
- SPX_FULL_HEIGHT * SPX_N)
- #define SPX_PK_BYTES (2 * SPX_N)
- #define SPX_SK_BYTES (2 * SPX_N + SPX_PK_BYTES)
-
- /* Optionally, signing can be made non-deterministic using optrand.
- This can help counter side-channel attacks that would benefit from
- getting a large number of traces when the signer uses the same nodes. */
- #define SPX_OPTRAND_BYTES 32
-
- #endif
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