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Help compilers with vectorization

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This commit is contained in:
Frank Denis 2017-11-18 13:19:00 +01:00
parent 686c6a210d
commit 933b3e8ec1
1 changed files with 14 additions and 10 deletions
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22
src/libsodium/crypto_core/ed25519/ref10/ed25519_ref10.c
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@ -985,20 +985,24 @@ ge25519_has_small_order(const unsigned char s[32])
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f }
};
unsigned char c[7] = { 0 };
unsigned int k;
size_t i, j;
unsigned char c;
for (i = 0; i < sizeof blacklist / sizeof blacklist[0]; i++) {
c = 0;
COMPILER_ASSERT(7 == sizeof blacklist / sizeof blacklist[0]);
for (j = 0; j < 31; j++) {
c |= s[j] ^ blacklist[i][j];
}
c |= (s[j] & 0x7f) ^ blacklist[i][j];
if (c == 0) {
return 1;
for (i = 0; i < sizeof blacklist / sizeof blacklist[0]; i++) {
c[i] |= s[j] ^ blacklist[i][j];
}
}
return 0;
for (i = 0; i < sizeof blacklist / sizeof blacklist[0]; i++) {
c[i] |= (s[j] & 0x7f) ^ blacklist[i][j];
}
k = 0;
for (i = 0; i < sizeof blacklist / sizeof blacklist[0]; i++) {
k |= (c[i] - 1);
}
return (int) ((k >> 8) & 1);
}
/*