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author | Niels Möller <nisse@lysator.liu.se> | 2013-05-17 10:09:17 +0200 |
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committer | Niels Möller <nisse@lysator.liu.se> | 2013-05-17 10:09:17 +0200 |
commit | 23f108fb3e09a76e923e97e08f560c2f2c91ff6e (patch) | |
tree | c9c950188595be0605b2a16b059eb59d27a9f690 /ecc-j-to-a.c | |
parent | f6360a087252e637e06ec9ccdccf5c5462b95fff (diff) | |
download | nettle-23f108fb3e09a76e923e97e08f560c2f2c91ff6e.tar.gz |
Fixed ECC bug with overlapping arguments to mpn_mul_n.
Diffstat (limited to 'ecc-j-to-a.c')
-rw-r--r-- | ecc-j-to-a.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/ecc-j-to-a.c b/ecc-j-to-a.c index df8b8764..26c1a03a 100644 --- a/ecc-j-to-a.c +++ b/ecc-j-to-a.c @@ -46,6 +46,7 @@ ecc_j_to_a (const struct ecc_curve *ecc, #define up (scratch + ecc->size) #define iz2p (scratch + ecc->size) #define iz3p (scratch + 2*ecc->size) +#define izBp (scratch + 3*ecc->size) #define tp scratch mp_limb_t cy; @@ -72,11 +73,11 @@ ecc_j_to_a (const struct ecc_curve *ecc, if (flags & 1) { /* Divide this common factor by B */ - mpn_copyi (iz3p, izp, ecc->size); - mpn_zero (iz3p + ecc->size, ecc->size); - ecc->redc (ecc, iz3p); - - ecc_modp_mul (ecc, iz2p, izp, iz3p); + mpn_copyi (izBp, izp, ecc->size); + mpn_zero (izBp + ecc->size, ecc->size); + ecc->redc (ecc, izBp); + + ecc_modp_mul (ecc, iz2p, izp, izBp); } else ecc_modp_sqr (ecc, iz2p, izp); |