Merge pull request #356 from PQClean/fix_frodokem
Fix overflowing multiplication in FrodoKEM AES
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commit
954c80b642
@ -110,10 +110,10 @@ int PQCLEAN_FRODOKEM1344AES_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t
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uint16_t sum[PARAMS_PARALLEL] = {0};
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for (j = 0; j < PARAMS_N; j++) { // Matrix-vector multiplication
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uint16_t sp = s[i * PARAMS_N + j];
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sum[0] += sp * a_cols_t[(k + 0) * PARAMS_N + j];
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sum[1] += sp * a_cols_t[(k + 1) * PARAMS_N + j];
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sum[2] += sp * a_cols_t[(k + 2) * PARAMS_N + j];
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sum[3] += sp * a_cols_t[(k + 3) * PARAMS_N + j];
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sum[0] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 0) * PARAMS_N + j]);
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sum[1] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 1) * PARAMS_N + j]);
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sum[2] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 2) * PARAMS_N + j]);
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sum[3] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 3) * PARAMS_N + j]);
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}
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out[i * PARAMS_N + kk + k + 0] += sum[0];
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out[i * PARAMS_N + kk + k + 2] += sum[2];
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@ -96,7 +96,7 @@ int PQCLEAN_FRODOKEM1344SHAKE_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_
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for (j = 0; j < 4; j++) {
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uint16_t sp = s[i * PARAMS_N + kk + j];
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for (k = 0; k < PARAMS_N; k++) { // Matrix-vector multiplication
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sum[k] += sp * a_cols[(t + j) * PARAMS_N + k];
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sum[k] += (uint16_t)(sp * (uint32_t)a_cols[(t + j) * PARAMS_N + k]);
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}
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}
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for (k = 0; k < PARAMS_N; k++) {
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@ -110,10 +110,10 @@ int PQCLEAN_FRODOKEM640AES_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t *
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uint16_t sum[PARAMS_PARALLEL] = {0};
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for (j = 0; j < PARAMS_N; j++) { // Matrix-vector multiplication
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uint16_t sp = s[i * PARAMS_N + j];
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sum[0] += sp * a_cols_t[(k + 0) * PARAMS_N + j];
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sum[1] += sp * a_cols_t[(k + 1) * PARAMS_N + j];
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sum[2] += sp * a_cols_t[(k + 2) * PARAMS_N + j];
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sum[3] += sp * a_cols_t[(k + 3) * PARAMS_N + j];
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sum[0] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 0) * PARAMS_N + j]);
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sum[1] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 1) * PARAMS_N + j]);
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sum[2] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 2) * PARAMS_N + j]);
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sum[3] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 3) * PARAMS_N + j]);
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}
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out[i * PARAMS_N + kk + k + 0] += sum[0];
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out[i * PARAMS_N + kk + k + 2] += sum[2];
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@ -96,7 +96,7 @@ int PQCLEAN_FRODOKEM640SHAKE_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t
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for (j = 0; j < 4; j++) {
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uint16_t sp = s[i * PARAMS_N + kk + j];
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for (k = 0; k < PARAMS_N; k++) { // Matrix-vector multiplication
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sum[k] += sp * a_cols[(t + j) * PARAMS_N + k];
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sum[k] += (uint16_t)(sp * (uint32_t)a_cols[(t + j) * PARAMS_N + k]);
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}
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}
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for (k = 0; k < PARAMS_N; k++) {
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@ -110,10 +110,10 @@ int PQCLEAN_FRODOKEM976AES_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t *
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uint16_t sum[PARAMS_PARALLEL] = {0};
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for (j = 0; j < PARAMS_N; j++) { // Matrix-vector multiplication
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uint16_t sp = s[i * PARAMS_N + j];
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sum[0] += sp * a_cols_t[(k + 0) * PARAMS_N + j];
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sum[1] += sp * a_cols_t[(k + 1) * PARAMS_N + j];
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sum[2] += sp * a_cols_t[(k + 2) * PARAMS_N + j];
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sum[3] += sp * a_cols_t[(k + 3) * PARAMS_N + j];
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sum[0] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 0) * PARAMS_N + j]);
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sum[1] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 1) * PARAMS_N + j]);
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sum[2] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 2) * PARAMS_N + j]);
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sum[3] += (uint16_t)(sp * (uint32_t)a_cols_t[(k + 3) * PARAMS_N + j]);
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}
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out[i * PARAMS_N + kk + k + 0] += sum[0];
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out[i * PARAMS_N + kk + k + 2] += sum[2];
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@ -96,7 +96,7 @@ int PQCLEAN_FRODOKEM976SHAKE_OPT_mul_add_sa_plus_e(uint16_t *out, const uint16_t
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for (j = 0; j < 4; j++) {
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uint16_t sp = s[i * PARAMS_N + kk + j];
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for (k = 0; k < PARAMS_N; k++) { // Matrix-vector multiplication
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sum[k] += sp * a_cols[(t + j) * PARAMS_N + k];
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sum[k] += (uint16_t)(sp * (uint32_t)a_cols[(t + j) * PARAMS_N + k]);
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}
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}
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for (k = 0; k < PARAMS_N; k++) {
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