Bitcoin Core  21.99.0
P2P Digital Currency
gen_context.c
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1 /***********************************************************************
2  * Copyright (c) 2013, 2014, 2015 Thomas Daede, Cory Fields *
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 /* Autotools creates libsecp256k1-config.h, of which ECMULT_GEN_PREC_BITS is needed.
8  ifndef guard so downstream users can define their own if they do not use autotools. */
9 #if !defined(ECMULT_GEN_PREC_BITS)
10 #include "libsecp256k1-config.h"
11 #endif
12 
13 /* We can't require the precomputed tables when creating them. */
14 #undef USE_ECMULT_STATIC_PRECOMPUTATION
15 
16 #include "include/secp256k1.h"
17 #include "assumptions.h"
18 #include "util.h"
19 #include "field_impl.h"
20 #include "scalar_impl.h"
21 #include "group_impl.h"
22 #include "ecmult_gen_impl.h"
23 
24 static void default_error_callback_fn(const char* str, void* data) {
25  (void)data;
26  fprintf(stderr, "[libsecp256k1] internal consistency check failed: %s\n", str);
27  abort();
28 }
29 
32  NULL
33 };
34 
35 int main(int argc, char **argv) {
37  void *prealloc, *base;
38  int inner;
39  int outer;
40  FILE* fp;
41 
42  (void)argc;
43  (void)argv;
44 
45  fp = fopen("src/ecmult_static_context.h","w");
46  if (fp == NULL) {
47  fprintf(stderr, "Could not open src/ecmult_static_context.h for writing!\n");
48  return -1;
49  }
50 
51  fprintf(fp, "#ifndef SECP256K1_ECMULT_STATIC_CONTEXT_H\n");
52  fprintf(fp, "#define SECP256K1_ECMULT_STATIC_CONTEXT_H\n");
53  fprintf(fp, "#include \"src/group.h\"\n");
54  fprintf(fp, "#define SC SECP256K1_GE_STORAGE_CONST\n");
55  fprintf(fp, "#if ECMULT_GEN_PREC_N != %d || ECMULT_GEN_PREC_G != %d\n", ECMULT_GEN_PREC_N, ECMULT_GEN_PREC_G);
56  fprintf(fp, " #error configuration mismatch, invalid ECMULT_GEN_PREC_N, ECMULT_GEN_PREC_G. Try deleting ecmult_static_context.h before the build.\n");
57  fprintf(fp, "#endif\n");
58  fprintf(fp, "static const secp256k1_ge_storage secp256k1_ecmult_static_context[ECMULT_GEN_PREC_N][ECMULT_GEN_PREC_G] = {\n");
59 
61  prealloc = base;
64  for(outer = 0; outer != ECMULT_GEN_PREC_N; outer++) {
65  fprintf(fp,"{\n");
66  for(inner = 0; inner != ECMULT_GEN_PREC_G; inner++) {
67  fprintf(fp," SC(%uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu, %uu)", SECP256K1_GE_STORAGE_CONST_GET((*ctx.prec)[outer][inner]));
68  if (inner != ECMULT_GEN_PREC_G - 1) {
69  fprintf(fp,",\n");
70  } else {
71  fprintf(fp,"\n");
72  }
73  }
74  if (outer != ECMULT_GEN_PREC_N - 1) {
75  fprintf(fp,"},\n");
76  } else {
77  fprintf(fp,"}\n");
78  }
79  }
80  fprintf(fp,"};\n");
82  free(base);
83 
84  fprintf(fp, "#undef SC\n");
85  fprintf(fp, "#endif\n");
86  fclose(fp);
87 
88  return 0;
89 }
field_impl.h
fsbridge::fopen
FILE * fopen(const fs::path &p, const char *mode)
Definition: fs.cpp:24
group_impl.h
ECMULT_GEN_PREC_N
#define ECMULT_GEN_PREC_N
Definition: ecmult_gen.h:18
util.h
ECMULT_GEN_PREC_G
#define ECMULT_GEN_PREC_G
Definition: ecmult_gen.h:17
secp256k1.h
secp256k1_ecmult_gen_context_init
static void secp256k1_ecmult_gen_context_init(secp256k1_ecmult_gen_context *ctx)
assumptions.h
checked_malloc
static SECP256K1_INLINE void * checked_malloc(const secp256k1_callback *cb, size_t size)
Definition: util.h:91
secp256k1_ecmult_gen_context_build
static void secp256k1_ecmult_gen_context_build(secp256k1_ecmult_gen_context *ctx, void **prealloc)
secp256k1_ecmult_gen_context
Definition: ecmult_gen.h:20
SECP256K1_GE_STORAGE_CONST_GET
#define SECP256K1_GE_STORAGE_CONST_GET(t)
Definition: group.h:40
default_error_callback
static const secp256k1_callback default_error_callback
Definition: gen_context.c:30
default_error_callback_fn
static void default_error_callback_fn(const char *str, void *data)
Definition: gen_context.c:24
libsecp256k1-config.h
ecmult_gen_impl.h
secp256k1_callback
Definition: util.h:19
scalar_impl.h
main
int main(int argc, char **argv)
Definition: gen_context.c:35
secp256k1_ecmult_gen_context_clear
static void secp256k1_ecmult_gen_context_clear(secp256k1_ecmult_gen_context *ctx)
SECP256K1_ECMULT_GEN_CONTEXT_PREALLOCATED_SIZE
static const size_t SECP256K1_ECMULT_GEN_CONTEXT_PREALLOCATED_SIZE
Definition: ecmult_gen.h:38
ctx
static secp256k1_context * ctx
Definition: tests.c:42