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Add an optblocker in ge25519_from_hash

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Frank Denis
2025-08-27 22:57:36 +02:00
parent b5275b9b27
commit 605f02d601
1 changed files with 2 additions and 2 deletions
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src/libsodium/crypto_core/ed25519/ref10/ed25519_ref10.c
+2 -2
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@@ -2629,7 +2629,7 @@ ge25519_from_hash(unsigned char s[32], const unsigned char h[64])
gl[31] &= 0x7f;
fe25519_frombytes(fe_f, fl);
fe25519_frombytes(fe_g, gl);
fe_f[0] += (h[32] >> 7) * 19;
fe_f[0] += (((h[32] >> 5) ^ optblocker_u8) >> 2) * 19;
for (i = 0; i < sizeof (fe25519) / sizeof fe_f[0]; i++) {
fe_f[i] += 38 * fe_g[i];
}
@@ -2689,7 +2689,7 @@ ristretto255_is_canonical(const unsigned char *s)
}
c = (((unsigned int) c) - 1U) >> 8;
d = (0xed - 1U - (unsigned int) s[0]) >> 8;
e = s[31] >> 7;
e = ((s[31] >> 5) ^ optblocker_u8) >> 2;
return 1 - (((c & d) | e | s[0]) & 1);
}