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Avoid bit shifting with signed values

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Frank Denis
2016-04-12 00:51:41 +02:00
parent 50e11be472
commit bbf1e17983
1 changed files with 10 additions and 10 deletions
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src/libsodium/crypto_scalarmult/curve25519/ref10/x25519_ref10.c
+10 -10
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@@ -127,17 +127,17 @@ fe_mul121666(fe h,const fe f)
int64_t carry8;
int64_t carry9;
carry9 = (h9 + ((int64_t) 1 << 24)) >> 25; h0 += carry9 * 19; h9 -= carry9 << 25;
carry1 = (h1 + ((int64_t) 1 << 24)) >> 25; h2 += carry1; h1 -= carry1 << 25;
carry3 = (h3 + ((int64_t) 1 << 24)) >> 25; h4 += carry3; h3 -= carry3 << 25;
carry5 = (h5 + ((int64_t) 1 << 24)) >> 25; h6 += carry5; h5 -= carry5 << 25;
carry7 = (h7 + ((int64_t) 1 << 24)) >> 25; h8 += carry7; h7 -= carry7 << 25;
carry9 = (h9 + ((int64_t) 1 << 24)) >> 25; h0 += carry9 * 19; h9 -= carry9 * ((int64_t) 1 << 25);
carry1 = (h1 + ((int64_t) 1 << 24)) >> 25; h2 += carry1; h1 -= carry1 * ((int64_t) 1 << 25);
carry3 = (h3 + ((int64_t) 1 << 24)) >> 25; h4 += carry3; h3 -= carry3 * ((int64_t) 1 << 25);
carry5 = (h5 + ((int64_t) 1 << 24)) >> 25; h6 += carry5; h5 -= carry5 * ((int64_t) 1 << 25);
carry7 = (h7 + ((int64_t) 1 << 24)) >> 25; h8 += carry7; h7 -= carry7 * ((int64_t) 1 << 25);
carry0 = (h0 + ((int64_t) 1 << 25)) >> 26; h1 += carry0; h0 -= carry0 << 26;
carry2 = (h2 + ((int64_t) 1 << 25)) >> 26; h3 += carry2; h2 -= carry2 << 26;
carry4 = (h4 + ((int64_t) 1 << 25)) >> 26; h5 += carry4; h4 -= carry4 << 26;
carry6 = (h6 + ((int64_t) 1 << 25)) >> 26; h7 += carry6; h6 -= carry6 << 26;
carry8 = (h8 + ((int64_t) 1 << 25)) >> 26; h9 += carry8; h8 -= carry8 << 26;
carry0 = (h0 + ((int64_t) 1 << 25)) >> 26; h1 += carry0; h0 -= carry0 * ((int64_t) 1 << 26);
carry2 = (h2 + ((int64_t) 1 << 25)) >> 26; h3 += carry2; h2 -= carry2 * ((int64_t) 1 << 26);
carry4 = (h4 + ((int64_t) 1 << 25)) >> 26; h5 += carry4; h4 -= carry4 * ((int64_t) 1 << 26);
carry6 = (h6 + ((int64_t) 1 << 25)) >> 26; h7 += carry6; h6 -= carry6 * ((int64_t) 1 << 26);
carry8 = (h8 + ((int64_t) 1 << 25)) >> 26; h9 += carry8; h8 -= carry8 * ((int64_t) 1 << 26);
h[0] = h0;
h[1] = h1;