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variable signing precompute table

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make ECMULT_GEN_PREC_BITS configurable

ecmult_static_context.h: add compile time config assertion (#3) - Prevents accidentally using a file which was generated with a
different configuration.

README: mention valgrind issue

With --with-ecmult-gen-precision=8, valgrind needs a max stack size
adjustment to not run into a stack switching heuristic:

http://valgrind.org/docs/manual/manual-core.html

> -max-stackframe= [default: 2000000]
> The maximum size of a stack frame. If the stack pointer moves by more than this amount then Valgrind will assume that the program is switching to a different stack.
You may need to use this option if your program has large stack-allocated arrays.

basic-config: undef ECMULT_WINDOW_SIZE before (re-)defining it
This commit is contained in:
djb
2015-10-18 10:35:16 +02:00
committed by douglasbakkum
parent b4bff99028
commit dcb2e3b3ff
8 changed files with 91 additions and 39 deletions
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20
src/gen_context.c
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@@ -4,9 +4,14 @@
* file COPYING or http://www.opensource.org/licenses/mit-license.php.*
**********************************************************************/
// Autotools creates libsecp256k1-config.h, of which ECMULT_GEN_PREC_BITS is needed.
// ifndef guard so downstream users can define their own if they do not use autotools.
#if !defined(ECMULT_GEN_PREC_BITS)
#include "libsecp256k1-config.h"
#endif
#define USE_BASIC_CONFIG 1
#include "basic-config.h"
#include "include/secp256k1.h"
#include "util.h"
#include "field_impl.h"
@@ -45,23 +50,26 @@ int main(int argc, char **argv) {
fprintf(fp, "#define _SECP256K1_ECMULT_STATIC_CONTEXT_\n");
fprintf(fp, "#include \"src/group.h\"\n");
fprintf(fp, "#define SC SECP256K1_GE_STORAGE_CONST\n");
fprintf(fp, "static const secp256k1_ge_storage secp256k1_ecmult_static_context[64][16] = {\n");
fprintf(fp, "#if ECMULT_GEN_PREC_N != %d || ECMULT_GEN_PREC_G != %d\n", ECMULT_GEN_PREC_N, ECMULT_GEN_PREC_G);
fprintf(fp, " #error configuration mismatch, invalid ECMULT_GEN_PREC_N, ECMULT_GEN_PREC_G. Try deleting ecmult_static_context.h before the build.\n");
fprintf(fp, "#endif\n");
fprintf(fp, "static const secp256k1_ge_storage secp256k1_ecmult_static_context[ECMULT_GEN_PREC_N][ECMULT_GEN_PREC_G] = {\n");
base = checked_malloc(&default_error_callback, SECP256K1_ECMULT_GEN_CONTEXT_PREALLOCATED_SIZE);
prealloc = base;
secp256k1_ecmult_gen_context_init(&ctx);
secp256k1_ecmult_gen_context_build(&ctx, &prealloc);
for(outer = 0; outer != 64; outer++) {
for(outer = 0; outer != ECMULT_GEN_PREC_N; outer++) {
fprintf(fp,"{\n");
for(inner = 0; inner != 16; inner++) {
for(inner = 0; inner != ECMULT_GEN_PREC_G; inner++) {
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]));
if (inner != 15) {
if (inner != ECMULT_GEN_PREC_G - 1) {
fprintf(fp,",\n");
} else {
fprintf(fp,"\n");
}
}
if (outer != 63) {
if (outer != ECMULT_GEN_PREC_N - 1) {
fprintf(fp,"},\n");
} else {
fprintf(fp,"}\n");