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| author | Niels Möller <nisse@lysator.liu.se> | 2019-12-09 18:58:53 +0100 |
|---|---|---|
| committer | Niels Möller <nisse@lysator.liu.se> | 2019-12-09 18:58:53 +0100 |
| commit | b5ae97a8892fd4ad2021d58d4af87d95314a8f44 (patch) | |
| tree | 35dc0023ba9f90170a617d68a305a097742557e2 /curve448-mul.c | |
| parent | d13bb31227f9fa58f3b1a41c79d7d39e4a0167b2 (diff) | |
| download | nettle-b5ae97a8892fd4ad2021d58d4af87d95314a8f44.tar.gz | |
Trim scratch usage of curve448 operations.
* ecc-448.c (ecc_mod_pow_446m224m1): Reduce scratch space from 9*n
to 6*n.
(ECC_448_INV_ITCH, ECC_448_SQRT_ITCH): Reduce accordingly.
* curve448-mul.c (curve448_mul): Reduce allocation from 14*n to 12*n.
Diffstat (limited to 'curve448-mul.c')
| -rw-r--r-- | curve448-mul.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/curve448-mul.c b/curve448-mul.c index afa814a4..59cf7664 100644 --- a/curve448-mul.c +++ b/curve448-mul.c @@ -34,6 +34,7 @@ # include "config.h" #endif +#include <assert.h> #include <string.h> #include "curve448.h" @@ -72,7 +73,8 @@ curve448_mul (uint8_t *q, const uint8_t *n, const uint8_t *p) #define a24 39081 - itch = ecc->p.size * 14; + itch = ecc->p.size * 12; + assert (ecc->p.invert_itch + 5*ecc->p.size <= itch); scratch = gmp_alloc_limbs (itch); /* Note that 255 % GMP_NUMB_BITS == 0 isn't supported, so x1 always |