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| author | Niels Möller <nisse@lysator.liu.se> | 2014-09-23 13:14:02 +0200 |
|---|---|---|
| committer | Niels Möller <nisse@lysator.liu.se> | 2014-09-23 13:14:02 +0200 |
| commit | a3328c58174827dbec966748a074db439d8e151a (patch) | |
| tree | b7a724adcbd13eabf2c79cbfbc81b9378ba7e14f /ecc-j-to-a.c | |
| parent | 64b9a7f8b361db607a64fd1366dc74f1b73da1e9 (diff) | |
| download | nettle-a3328c58174827dbec966748a074db439d8e151a.tar.gz | |
ecc_mod_inv interface and allocation changes.
Diffstat (limited to 'ecc-j-to-a.c')
| -rw-r--r-- | ecc-j-to-a.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/ecc-j-to-a.c b/ecc-j-to-a.c index 8c52eb36..2e48b94d 100644 --- a/ecc-j-to-a.c +++ b/ecc-j-to-a.c @@ -52,7 +52,7 @@ ecc_j_to_a (const struct ecc_curve *ecc, mp_limb_t *scratch) { #define izp scratch -#define up (scratch + ecc->p.size) +#define up (scratch + 2*ecc->p.size) #define iz2p (scratch + ecc->p.size) #define iz3p (scratch + 2*ecc->p.size) #define izBp (scratch + 3*ecc->p.size) @@ -65,10 +65,7 @@ ecc_j_to_a (const struct ecc_curve *ecc, /* Set v = (r_z / B^2)^-1, r_x = p_x v^2 / B^3 = ((v/B * v)/B * p_x)/B - r_y = p_y v^3 / B^4 = (((v/B * v)/B * v)/B * p_x)/B - - Skip the first redc, if we want to stay in Montgomery - representation. + r_y = p_y v^3 / B^4 = (((v/B * v)/B * v)/B * p_y)/B */ mpn_copyi (up, p + 2*ecc->p.size, ecc->p.size); |