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Generate ecmult_static_pre_g.h

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This header contains a static array that replaces the ecmult_context pre_g and pre_g_128 tables.
The gen_ecmult_static_pre_g program generates this header file.
This commit is contained in:
Russell O'Connor
2021-06-28 16:33:03 -04:00
parent 8de2d86a06
commit 16a3cc07e8
9 changed files with 16807 additions and 39 deletions
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18
src/ecmult_impl.h
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@@ -44,28 +44,14 @@
# define WINDOW_G ECMULT_WINDOW_SIZE
#endif
/* Noone will ever need more than a window size of 24. The code might
* be correct for larger values of ECMULT_WINDOW_SIZE but this is not
* not tested.
*
* The following limitations are known, and there are probably more:
* If WINDOW_G > 27 and size_t has 32 bits, then the code is incorrect
* because the size of the memory object that we allocate (in bytes)
* will not fit in a size_t.
* If WINDOW_G > 31 and int has 32 bits, then the code is incorrect
* because certain expressions will overflow.
*/
#if ECMULT_WINDOW_SIZE < 2 || ECMULT_WINDOW_SIZE > 24
# error Set ECMULT_WINDOW_SIZE to an integer in range [2..24].
#if ECMULT_WINDOW_SIZE < WINDOW_G
# error ECMULT_WINDOW_SIZE too small for WINDOW_G.
#endif
#define WNAF_BITS 128
#define WNAF_SIZE_BITS(bits, w) (((bits) + (w) - 1) / (w))
#define WNAF_SIZE(w) WNAF_SIZE_BITS(WNAF_BITS, w)
/** The number of entries a table with precomputed multiples needs to have. */
#define ECMULT_TABLE_SIZE(w) (1 << ((w)-2))
/* The number of objects allocated on the scratch space for ecmult_multi algorithms */
#define PIPPENGER_SCRATCH_OBJECTS 6
#define STRAUSS_SCRATCH_OBJECTS 6