| /* 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_UTIL_H |
| #define OPENSSL_HEADER_CRYPTO_SPX_UTIL_H |
| |
| #include <openssl/base.h> |
| |
| #if defined(__cplusplus) |
| extern "C" { |
| #endif |
| |
| |
| // Encodes the integer value of input to out_len bytes in big-endian order. |
| // Note that input < 2^(8*out_len), as otherwise this function will truncate |
| // the least significant bytes of the integer representation. |
| void spx_uint64_to_len_bytes(uint8_t *output, size_t out_len, uint64_t input); |
| |
| uint64_t spx_to_uint64(const uint8_t *input, size_t input_len); |
| |
| // Compute the base 2^log2_b representation of X. |
| // |
| // As some of the parameter sets in https://eprint.iacr.org/2022/1725.pdf use |
| // a FORS height > 16 we use a uint32_t to store the output. |
| void spx_base_b(uint32_t *output, size_t out_len, const uint8_t *input, |
| unsigned int log2_b); |
| |
| |
| #if defined(__cplusplus) |
| } // extern C |
| #endif |
| |
| #endif // OPENSSL_HEADER_CRYPTO_SPX_UTIL_H |
