1 /* Copyright (c) 2023, Google LLC 2 * 3 * Permission to use, copy, modify, and/or distribute this software for any 4 * purpose with or without fee is hereby granted, provided that the above 5 * copyright notice and this permission notice appear in all copies. 6 * 7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION 12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN 13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ 14 15 #ifndef OPENSSL_HEADER_CRYPTO_SPX_FORS_H 16 #define OPENSSL_HEADER_CRYPTO_SPX_FORS_H 17 18 #include <openssl/base.h> 19 20 #include "./params.h" 21 22 #if defined(__cplusplus) 23 extern "C" { 24 #endif 25 26 27 // Algorithm 13: Generate a FORS private key value. 28 void spx_fors_sk_gen(uint8_t *fors_sk, uint32_t idx, 29 const uint8_t sk_seed[SPX_N], const uint8_t pk_seed[SPX_N], 30 uint8_t addr[32]); 31 32 // Algorithm 14: Compute the root of a Merkle subtree of FORS public values. 33 void spx_fors_treehash(uint8_t root_node[SPX_N], const uint8_t sk_seed[SPX_N], 34 uint32_t i /*target node index*/, 35 uint32_t z /*target node height*/, 36 const uint8_t pk_seed[SPX_N], uint8_t addr[32]); 37 38 // Algorithm 15: Generate a FORS signature. 39 void spx_fors_sign(uint8_t *fors_sig, const uint8_t message[SPX_FORS_MSG_BYTES], 40 const uint8_t sk_seed[SPX_N], const uint8_t pk_seed[SPX_N], 41 uint8_t addr[32]); 42 43 // Algorithm 16: Compute a FORS public key from a FORS signature. 44 void spx_fors_pk_from_sig(uint8_t *fors_pk, 45 const uint8_t fors_sig[SPX_FORS_BYTES], 46 const uint8_t message[SPX_FORS_MSG_BYTES], 47 const uint8_t pk_seed[SPX_N], uint8_t addr[32]); 48 49 50 #if defined(__cplusplus) 51 } // extern C 52 #endif 53 54 #endif // OPENSSL_HEADER_CRYPTO_SPX_FORS_H 55