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Handle identity; fix comment

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This commit is contained in:
Frank Denis 2020-04-21 12:24:40 +02:00
parent 6f1c987d2e
commit f582db039f
1 changed files with 2 additions and 1 deletions
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src/libsodium/crypto_core/ed25519/ref10/ed25519_ref10.c
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@ -2550,7 +2550,7 @@ chi25519(fe25519 out, const fe25519 z)
fe25519_mul(out, t1, t0);
}
/* montgomery to edwards - xed = sqrt(-A)*x/y */
/* montgomery to edwards -- xed = sqrt(-A-2)*x/y */
static void
ge25519_xymont_to_xed(fe25519 xed, const fe25519 x, const fe25519 y)
{
@ -2575,6 +2575,7 @@ ge25519_xmont_to_yed(fe25519 yed, const fe25519 x)
fe25519_sub(x_minus_one, x, one);
fe25519_invert(x_plus_one_inv, x_plus_one);
fe25519_mul(yed, x_minus_one, x_plus_one_inv);
fe25519_cmov(yed, one, fe25519_iszero(x_plus_one));
}
/* montgomery -- recover y = sqrt(x^3 + A*x^2 + x) */