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Merge pull request #356 from PQClean/fix_frodokem

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Fix overflowing multiplication in FrodoKEM AES
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Thom Wiggers 2020-11-18 14:28:09 +01:00 committato da GitHub
commit 954c80b642
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ID Chiave GPG: 4AEE18F83AFDEB23
6 ha cambiato i file con 15 aggiunte e 15 eliminazioni
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8
crypto_kem/frodokem1344aes/opt/matrix_aes.c
Vedi 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];

2
crypto_kem/frodokem1344shake/opt/matrix_shake.c
Vedi File

@ -96,7 +96,7 @@ int PQCLEAN_FRODOKEM1344SHAKE_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_
for (j = 0; j < 4; j++) {
uint16_t sp = s[i * PARAMS_N + kk + j];
for (k = 0; k < PARAMS_N; k++) { // Matrix-vector multiplication
sum[k] += sp * a_cols[(t + j) * PARAMS_N + k];
sum[k] += (uint16_t)(sp * (uint32_t)a_cols[(t + j) * PARAMS_N + k]);
}
}
for (k = 0; k < PARAMS_N; k++) {

8
crypto_kem/frodokem640aes/opt/matrix_aes.c
Vedi File

@ -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];

2
crypto_kem/frodokem640shake/opt/matrix_shake.c
Vedi File

@ -96,7 +96,7 @@ int PQCLEAN_FRODOKEM640SHAKE_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t
for (j = 0; j < 4; j++) {
uint16_t sp = s[i * PARAMS_N + kk + j];
for (k = 0; k < PARAMS_N; k++) { // Matrix-vector multiplication
sum[k] += sp * a_cols[(t + j) * PARAMS_N + k];
sum[k] += (uint16_t)(sp * (uint32_t)a_cols[(t + j) * PARAMS_N + k]);
}
}
for (k = 0; k < PARAMS_N; k++) {

8
crypto_kem/frodokem976aes/opt/matrix_aes.c
Vedi 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];

2
crypto_kem/frodokem976shake/opt/matrix_shake.c
Vedi File

@ -96,7 +96,7 @@ int PQCLEAN_FRODOKEM976SHAKE_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t
for (j = 0; j < 4; j++) {
uint16_t sp = s[i * PARAMS_N + kk + j];
for (k = 0; k < PARAMS_N; k++) { // Matrix-vector multiplication
sum[k] += sp * a_cols[(t + j) * PARAMS_N + k];
sum[k] += (uint16_t)(sp * (uint32_t)a_cols[(t + j) * PARAMS_N + k]);
}
}
for (k = 0; k < PARAMS_N; k++) {