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Fix overflow in multiplication in Saber

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This commit is contained in:
Sofía Celi 2020-08-11 10:47:34 -05:00
parent dc69ab19db
commit 534e7a1277
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GPG Key ID: 008222C3AEE7208A
3 changed files with 3 additions and 3 deletions
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2
crypto_kem/firesaber/clean/poly_mul.c
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@ -47,7 +47,7 @@ static void karatsuba_simple(const uint16_t *a_1, const uint16_t *b_1, uint16_t
acc7 = acc5 + acc6; //b01 acc7 = acc5 + acc6; //b01
acc8 = acc1 + acc2; //a01 acc8 = acc1 + acc2; //a01
d01[i + j] = d01[i + j] + acc7 * acc8; d01[i + j] = d01[i + j] + (uint16_t)(acc7 * (uint64_t)acc8);
//-------------------------------------------------------- //--------------------------------------------------------
acc7 = b_1[j + 2 * KARATSUBA_N / 4]; //b2 acc7 = b_1[j + 2 * KARATSUBA_N / 4]; //b2

2
crypto_kem/lightsaber/clean/poly_mul.c
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@ -47,7 +47,7 @@ static void karatsuba_simple(const uint16_t *a_1, const uint16_t *b_1, uint16_t
acc7 = acc5 + acc6; //b01 acc7 = acc5 + acc6; //b01
acc8 = acc1 + acc2; //a01 acc8 = acc1 + acc2; //a01
d01[i + j] = d01[i + j] + acc7 * acc8; d01[i + j] = d01[i + j] + (uint16_t)(acc7 * (uint64_t)acc8);
//-------------------------------------------------------- //--------------------------------------------------------
acc7 = b_1[j + 2 * KARATSUBA_N / 4]; //b2 acc7 = b_1[j + 2 * KARATSUBA_N / 4]; //b2

2
crypto_kem/saber/clean/poly_mul.c
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@ -47,7 +47,7 @@ static void karatsuba_simple(const uint16_t *a_1, const uint16_t *b_1, uint16_t
acc7 = acc5 + acc6; //b01 acc7 = acc5 + acc6; //b01
acc8 = acc1 + acc2; //a01 acc8 = acc1 + acc2; //a01
d01[i + j] = d01[i + j] + acc7 * acc8; d01[i + j] = d01[i + j] + (uint16_t)(acc7 * (uint64_t)acc8);
//-------------------------------------------------------- //--------------------------------------------------------
acc7 = b_1[j + 2 * KARATSUBA_N / 4]; //b2 acc7 = b_1[j + 2 * KARATSUBA_N / 4]; //b2