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Fix overflowing multiplication in FrodoKEM AES

master
Thom Wiggers 4 years ago
parent
9120129ca4
commit
3efcd2b186
No known key found for this signature in database GPG Key ID: 1BB0A7CE26E363
3 changed files with 13 additions and 13 deletions
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  1. +4
    -4
      crypto_kem/frodokem1344aes/opt/matrix_aes.c
  2. +5
    -5
      crypto_kem/frodokem640aes/opt/matrix_aes.c
  3. +4
    -4
      crypto_kem/frodokem976aes/opt/matrix_aes.c

+ 4
- 4
crypto_kem/frodokem1344aes/opt/matrix_aes.c View File

@@ -110,10 +110,10 @@ int PQCLEAN_FRODOKEM1344AES_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t
uint16_t sum[PARAMS_PARALLEL] = {0};
for (j = 0; j < PARAMS_N; j++) { // Matrix-vector multiplication
uint16_t sp = s[i * PARAMS_N + j];
sum[0] += sp * a_cols_t[(k + 0) * PARAMS_N + j];
sum[1] += sp * a_cols_t[(k + 1) * PARAMS_N + j];
sum[2] += sp * a_cols_t[(k + 2) * PARAMS_N + j];
sum[3] += sp * a_cols_t[(k + 3) * PARAMS_N + j];
sum[0] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 0) * PARAMS_N + j]);
sum[1] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 1) * PARAMS_N + j]);
sum[2] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 2) * PARAMS_N + j]);
sum[3] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 3) * PARAMS_N + j]);
}
out[i * PARAMS_N + kk + k + 0] += sum[0];
out[i * PARAMS_N + kk + k + 2] += sum[2];


+ 5
- 5
crypto_kem/frodokem640aes/opt/matrix_aes.c View File

@@ -80,7 +80,7 @@ int PQCLEAN_FRODOKEM640AES_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t *
*((uint32_t *)&out[i]) = *((uint32_t *)&e[i]);
}

int k;
size_t k;
uint16_t a_cols[PARAMS_N * PARAMS_STRIPE_STEP] = {0};
uint16_t a_cols_t[PARAMS_N * PARAMS_STRIPE_STEP];
uint16_t a_cols_temp[PARAMS_N * PARAMS_STRIPE_STEP] = {0};
@@ -110,10 +110,10 @@ int PQCLEAN_FRODOKEM640AES_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t *
uint16_t sum[PARAMS_PARALLEL] = {0};
for (j = 0; j < PARAMS_N; j++) { // Matrix-vector multiplication
uint16_t sp = s[i * PARAMS_N + j];
sum[0] += sp * a_cols_t[(k + 0) * PARAMS_N + j];
sum[1] += sp * a_cols_t[(k + 1) * PARAMS_N + j];
sum[2] += sp * a_cols_t[(k + 2) * PARAMS_N + j];
sum[3] += sp * a_cols_t[(k + 3) * PARAMS_N + j];
sum[0] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 0) * PARAMS_N + j]);
sum[1] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 1) * PARAMS_N + j]);
sum[2] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 2) * PARAMS_N + j]);
sum[3] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 3) * PARAMS_N + j]);
}
out[i * PARAMS_N + kk + k + 0] += sum[0];
out[i * PARAMS_N + kk + k + 2] += sum[2];


+ 4
- 4
crypto_kem/frodokem976aes/opt/matrix_aes.c View File

@@ -110,10 +110,10 @@ int PQCLEAN_FRODOKEM976AES_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t *
uint16_t sum[PARAMS_PARALLEL] = {0};
for (j = 0; j < PARAMS_N; j++) { // Matrix-vector multiplication
uint16_t sp = s[i * PARAMS_N + j];
sum[0] += sp * a_cols_t[(k + 0) * PARAMS_N + j];
sum[1] += sp * a_cols_t[(k + 1) * PARAMS_N + j];
sum[2] += sp * a_cols_t[(k + 2) * PARAMS_N + j];
sum[3] += sp * a_cols_t[(k + 3) * PARAMS_N + j];
sum[0] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 0) * PARAMS_N + j]);
sum[1] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 1) * PARAMS_N + j]);
sum[2] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 2) * PARAMS_N + j]);
sum[3] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 3) * PARAMS_N + j]);
}
out[i * PARAMS_N + kk + k + 0] += sum[0];
out[i * PARAMS_N + kk + k + 2] += sum[2];


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