Commit 346cfb55 authored by Niels Möller's avatar Niels Möller
Browse files

Comment fixes.

parent 88a8a9e0
......@@ -72,9 +72,9 @@ ecc_add_ehh (const struct ecc_curve *ecc,
E = b*C*D 2 mul A, B, C, D, E
F = B - E A, B, C, D, E, F
G = B + E A, C, D, F, G
x3 = a*f*[(x1+y1)(x2+y2) - c - d] 3 mul A, C, D, G
y3 = a*g*(d-c) 2 mul F, G
z3 = f*g mul
x3 = A*F*[(x1+y1)(x2+y2) - C - D] 3 mul A, C, D, G
y3 = A*G*(D-C) 2 mul F, G
z3 = F*G mul
#define A scratch
#define B (scratch + ecc->size)
......@@ -74,7 +74,10 @@ ecc_eh_to_a (const struct ecc_curve *ecc,
ecc_modp_sub (ecc, izp, wp, vp);
/* FIXME: For the infinity point, this subtraction gives zero (mod
p), and the inversion below fails and returns something else. */
p), which isn't invertible. For curve25519, the desired output is
x = 0, which we get if the modular inversion function returns 0
in this case. Need to check that modular inversion really returns
0. */
ecc_modp_mul (ecc, izp + ecc->size, izp, up);
/* Needs 3*size scratch */
ecc_modp_inv (ecc, izp, izp + ecc->size, izp + 2*ecc->size);
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