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Code Issues 1 Releases Wiki Activity

NTRU Prime: avoid unsigned unary negation

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This commit is contained in:
John M. Schanck 2020-09-01 16:18:21 -04:00
parent 2b54c6570d
commit 22c4feb174
9 changed files with 9 additions and 9 deletions
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2
crypto_kem/sntrup653/avx2/crypto_core_invsntrup653.c
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@ -16,7 +16,7 @@
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/sntrup653/clean/crypto_core_inv3sntrup653.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/sntrup653/clean/crypto_core_wforcesntrup653.c
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@ -14,7 +14,7 @@ typedef int8 small;
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/avx2/crypto_core_invsntrup761.c
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@ -16,7 +16,7 @@
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_inv3sntrup761.c
View File

@ -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_wforcesntrup761.c
View File

@ -14,7 +14,7 @@ typedef int8 small;
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/avx2/crypto_core_invsntrup857.c
View File

@ -16,7 +16,7 @@
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_inv3sntrup857.c
View File

@ -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_wforcesntrup857.c
View File

@ -14,7 +14,7 @@ typedef int8 small;
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 */
}