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NTRU Prime: more unary negations

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John M. Schanck 2020-09-01 17:15:01 -04:00 committed by Kris Kwiatkowski
父節點 c2d2d145b7
當前提交 333248de03
共有 3 個文件被更改，包括 3 次插入 和 3 次删除
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2
crypto_kem/sntrup653/clean/crypto_core_invsntrup653.c
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@ -15,7 +15,7 @@
static int int16_nonzero_mask(int16 x) {
uint16 u = (uint16) x; /* 0, else 1...65535 */
uint32 v = u; /* 0, else 1...65535 */
v = -v; /* 0, else 2^32-65535...2^32-1 */
v = ~v + 1; /* 0, else 2^32-65535...2^32-1 */
v >>= 31; /* 0, else 1 */
return -(int) v; /* 0, else -1 */
}

2
crypto_kem/sntrup761/clean/crypto_core_invsntrup761.c
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@ -15,7 +15,7 @@
static int int16_nonzero_mask(int16 x) {
uint16 u = (uint16) x; /* 0, else 1...65535 */
uint32 v = u; /* 0, else 1...65535 */
v = -v; /* 0, else 2^32-65535...2^32-1 */
v = ~v + 1; /* 0, else 2^32-65535...2^32-1 */
v >>= 31; /* 0, else 1 */
return -(int) v; /* 0, else -1 */
}

2
crypto_kem/sntrup857/clean/crypto_core_invsntrup857.c
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@ -15,7 +15,7 @@
static int int16_nonzero_mask(int16 x) {
uint16 u = (uint16) x; /* 0, else 1...65535 */
uint32 v = u; /* 0, else 1...65535 */
v = -v; /* 0, else 2^32-65535...2^32-1 */
v = ~v + 1; /* 0, else 2^32-65535...2^32-1 */
v >>= 31; /* 0, else 1 */
return -(int) v; /* 0, else -1 */
}