840ae6961
Denys Vlasenko
2021-04-27
Subject
tls: shrink sp_256_mod_mul_norm_10 more
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Commit Diff GitHub →
networking/tls_sp_c32.c+18 -18
| @@ -557,24 +557,24 @@ static void sp_256_mod_mul_norm_10(sp_digit* r, const sp_digit* a) | |
| t[3] -= o; | |
| t[6] -= o; | |
| t[7] += o; | |
| - | t[1] += t[0] >> 32; t[0] &= 0xffffffff; |
| - | t[2] += t[1] >> 32; t[1] &= 0xffffffff; |
| - | t[3] += t[2] >> 32; t[2] &= 0xffffffff; |
| - | t[4] += t[3] >> 32; t[3] &= 0xffffffff; |
| - | t[5] += t[4] >> 32; t[4] &= 0xffffffff; |
| - | t[6] += t[5] >> 32; t[5] &= 0xffffffff; |
| - | t[7] += t[6] >> 32; t[6] &= 0xffffffff; |
| - | |
| - | r[0] = 0x3ffffff & ((sp_digit)(t[0])); |
| - | r[1] = 0x3ffffff & ((sp_digit)(t[0] >> 26) | ((sp_digit)t[1] << 6)); |
| - | r[2] = 0x3ffffff & ((sp_digit)(t[1] >> 20) | ((sp_digit)t[2] << 12)); |
| - | r[3] = 0x3ffffff & ((sp_digit)(t[2] >> 14) | ((sp_digit)t[3] << 18)); |
| - | r[4] = 0x3ffffff & ((sp_digit)(t[3] >> 8) | ((sp_digit)t[4] << 24)); |
| - | r[5] = 0x3ffffff & ((sp_digit)t[4] >> 2); /* small shift, ok to cast t[4] to narrower type */ |
| - | r[6] = 0x3ffffff & ((sp_digit)(t[4] >> 28) | ((sp_digit)t[5] << 4)); |
| - | r[7] = 0x3ffffff & ((sp_digit)(t[5] >> 22) | ((sp_digit)t[6] << 10)); |
| - | r[8] = 0x3ffffff & ((sp_digit)(t[6] >> 16) | ((sp_digit)t[7] << 16)); |
| - | r[9] = ((sp_digit)(t[7] >> 10)); |
| + | t[1] += t[0] >> 32; //t[0] &= 0xffffffff; |
| + | t[2] += t[1] >> 32; //t[1] &= 0xffffffff; |
| + | t[3] += t[2] >> 32; //t[2] &= 0xffffffff; |
| + | t[4] += t[3] >> 32; //t[3] &= 0xffffffff; |
| + | t[5] += t[4] >> 32; //t[4] &= 0xffffffff; |
| + | t[6] += t[5] >> 32; //t[5] &= 0xffffffff; |
| + | t[7] += t[6] >> 32; //t[6] &= 0xffffffff; - (uint32_t)t[i] casts below accomplish masking |
| + | |
| + | r[0] = 0x3ffffff & ((sp_digit)((uint32_t)t[0])); |
| + | r[1] = 0x3ffffff & ((sp_digit)((uint32_t)t[0] >> 26) | ((sp_digit)t[1] << 6)); |
| + | r[2] = 0x3ffffff & ((sp_digit)((uint32_t)t[1] >> 20) | ((sp_digit)t[2] << 12)); |
| + | r[3] = 0x3ffffff & ((sp_digit)((uint32_t)t[2] >> 14) | ((sp_digit)t[3] << 18)); |
| + | r[4] = 0x3ffffff & ((sp_digit)((uint32_t)t[3] >> 8) | ((sp_digit)t[4] << 24)); |
| + | r[5] = 0x3ffffff & ((sp_digit)((uint32_t)t[4] >> 2)); |
| + | r[6] = 0x3ffffff & ((sp_digit)((uint32_t)t[4] >> 28) | ((sp_digit)t[5] << 4)); |
| + | r[7] = 0x3ffffff & ((sp_digit)((uint32_t)t[5] >> 22) | ((sp_digit)t[6] << 10)); |
| + | r[8] = 0x3ffffff & ((sp_digit)((uint32_t)t[6] >> 16) | ((sp_digit)t[7] << 16)); |
| + | r[9] = ((sp_digit)((uint32_t)t[7] >> 10)); |
| } | |
| /* Map the Montgomery form projective co-ordinate point to an affine point. | |