Bitcoin Core  24.99.0
P2P Digital Currency
precompute_ecmult_gen.c
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1 /*********************************************************************************
2  * Copyright (c) 2013, 2014, 2015, 2021 Thomas Daede, Cory Fields, Pieter Wuille *
3  * Distributed under the MIT software license, see the accompanying *
4  * file COPYING or https://www.opensource.org/licenses/mit-license.php. *
5  *********************************************************************************/
6 
7 #include <inttypes.h>
8 #include <stdio.h>
9 
10 #include "../include/secp256k1.h"
11 #include "assumptions.h"
12 #include "util.h"
13 #include "group.h"
14 #include "ecmult_gen.h"
16 
17 int main(int argc, char **argv) {
18  const char outfile[] = "src/precomputed_ecmult_gen.c";
19  FILE* fp;
20  int bits;
21 
22  (void)argc;
23  (void)argv;
24 
25  fp = fopen(outfile, "w");
26  if (fp == NULL) {
27  fprintf(stderr, "Could not open %s for writing!\n", outfile);
28  return -1;
29  }
30 
31  fprintf(fp, "/* This file was automatically generated by precompute_ecmult_gen. */\n");
32  fprintf(fp, "/* See ecmult_gen_impl.h for details about the contents of this file. */\n");
33  fprintf(fp, "#if defined HAVE_CONFIG_H\n");
34  fprintf(fp, "# include \"libsecp256k1-config.h\"\n");
35  fprintf(fp, "#endif\n");
36  fprintf(fp, "#include \"../include/secp256k1.h\"\n");
37  fprintf(fp, "#include \"group.h\"\n");
38  fprintf(fp, "#include \"ecmult_gen.h\"\n");
39  fprintf(fp, "#include \"precomputed_ecmult_gen.h\"\n");
40  fprintf(fp, "#ifdef EXHAUSTIVE_TEST_ORDER\n");
41  fprintf(fp, "# error Cannot compile precomputed_ecmult_gen.c in exhaustive test mode\n");
42  fprintf(fp, "#endif /* EXHAUSTIVE_TEST_ORDER */\n");
43  fprintf(fp, "#define S(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) SECP256K1_GE_STORAGE_CONST(0x##a##u,0x##b##u,0x##c##u,0x##d##u,0x##e##u,0x##f##u,0x##g##u,0x##h##u,0x##i##u,0x##j##u,0x##k##u,0x##l##u,0x##m##u,0x##n##u,0x##o##u,0x##p##u)\n");
44  fprintf(fp, "const secp256k1_ge_storage secp256k1_ecmult_gen_prec_table[ECMULT_GEN_PREC_N(ECMULT_GEN_PREC_BITS)][ECMULT_GEN_PREC_G(ECMULT_GEN_PREC_BITS)] = {\n");
45 
46  for (bits = 2; bits <= 8; bits *= 2) {
47  int g = ECMULT_GEN_PREC_G(bits);
48  int n = ECMULT_GEN_PREC_N(bits);
49  int inner, outer;
50 
53 
54  fprintf(fp, "#if ECMULT_GEN_PREC_BITS == %d\n", bits);
55  for(outer = 0; outer != n; outer++) {
56  fprintf(fp,"{");
57  for(inner = 0; inner != g; inner++) {
58  fprintf(fp, "S(%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32
59  ",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32",%"PRIx32")",
60  SECP256K1_GE_STORAGE_CONST_GET(table[outer * g + inner]));
61  if (inner != g - 1) {
62  fprintf(fp,",\n");
63  }
64  }
65  if (outer != n - 1) {
66  fprintf(fp,"},\n");
67  } else {
68  fprintf(fp,"}\n");
69  }
70  }
71  fprintf(fp, "#endif\n");
72  free(table);
73  }
74 
75  fprintf(fp, "};\n");
76  fprintf(fp, "#undef S\n");
77  fclose(fp);
78 
79  return 0;
80 }
#define ECMULT_GEN_PREC_G(bits)
Definition: ecmult_gen.h:16
#define ECMULT_GEN_PREC_N(bits)
Definition: ecmult_gen.h:17
static void secp256k1_ecmult_gen_compute_table(secp256k1_ge_storage *table, const secp256k1_ge *gen, int bits)
#define SECP256K1_GE_STORAGE_CONST_GET(t)
Definition: group.h:45
static const secp256k1_ge secp256k1_ge_const_g
Definition: group_impl.h:62
FILE * fopen(const fs::path &p, const char *mode)
Definition: fs.cpp:25
int main(int argc, char **argv)
static SECP256K1_INLINE void * checked_malloc(const secp256k1_callback *cb, size_t size)
Definition: util.h:118
static const secp256k1_callback default_error_callback
Definition: util.h:49