diff options
Diffstat (limited to 'src/plugins/crypto_native/aes_gcm.c')
| -rw-r--r-- | src/plugins/crypto_native/aes_gcm.c | 56 |
1 files changed, 30 insertions, 26 deletions
diff --git a/src/plugins/crypto_native/aes_gcm.c b/src/plugins/crypto_native/aes_gcm.c index 8bd5d29a1ad..9fe0582ad44 100644 --- a/src/plugins/crypto_native/aes_gcm.c +++ b/src/plugins/crypto_native/aes_gcm.c @@ -26,10 +26,11 @@ #pragma GCC optimize ("O3") #endif +#define NUM_HI 8 typedef struct { /* pre-calculated hash key values */ - const u8x16 Hi[8]; + const u8x16 Hi[NUM_HI]; /* extracted AES key */ const u8x16 Ke[15]; } aes_gcm_key_data_t; @@ -103,10 +104,10 @@ aes_gcm_ghash_blocks (u8x16 T, aes_gcm_key_data_t * kd, u8x16u * in, int n_blocks) { ghash_data_t _gd, *gd = &_gd; - const u8x16 *Hi = kd->Hi + n_blocks - 1; + u8x16 *Hi = (u8x16 *) kd->Hi + NUM_HI - n_blocks; ghash_mul_first (gd, u8x16_reflect (in[0]) ^ T, Hi[0]); for (int i = 1; i < n_blocks; i++) - ghash_mul_next (gd, u8x16_reflect ((in[i])), Hi[-i]); + ghash_mul_next (gd, u8x16_reflect ((in[i])), Hi[i]); ghash_reduce (gd); ghash_reduce2 (gd); return ghash_final (gd); @@ -147,7 +148,7 @@ aes_gcm_ghash (u8x16 T, aes_gcm_key_data_t * kd, u8x16u * in, u32 n_left) if (n_left) { u8x16 r = aes_load_partial (in, n_left); - T = ghash_mul (u8x16_reflect (r) ^ T, kd->Hi[0]); + T = ghash_mul (u8x16_reflect (r) ^ T, kd->Hi[NUM_HI - 1]); } return T; } @@ -161,7 +162,8 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, u8x16 r[n]; ghash_data_t _gd = { }, *gd = &_gd; const u8x16 *rk = (u8x16 *) kd->Ke; - int hidx = is_encrypt ? 4 : n, didx = 0; + int ghash_blocks = is_encrypt ? 4 : n, gc = 1; + u8x16 *Hi = (u8x16 *) kd->Hi + NUM_HI - ghash_blocks; clib_prefetch_load (inv + 4); @@ -175,31 +177,31 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, /* GHASH multiply block 1 */ if (with_ghash) - ghash_mul_first (gd, u8x16_reflect (d[didx++]) ^ T, kd->Hi[--hidx]); + ghash_mul_first (gd, u8x16_reflect (d[0]) ^ T, Hi[0]); /* AES rounds 2 and 3 */ aes_gcm_enc_round (r, rk[2], n); aes_gcm_enc_round (r, rk[3], n); /* GHASH multiply block 2 */ - if (with_ghash && hidx) - ghash_mul_next (gd, u8x16_reflect (d[didx++]), kd->Hi[--hidx]); + if (with_ghash && gc++ < ghash_blocks) + ghash_mul_next (gd, u8x16_reflect (d[1]), Hi[1]); /* AES rounds 4 and 5 */ aes_gcm_enc_round (r, rk[4], n); aes_gcm_enc_round (r, rk[5], n); /* GHASH multiply block 3 */ - if (with_ghash && hidx) - ghash_mul_next (gd, u8x16_reflect (d[didx++]), kd->Hi[--hidx]); + if (with_ghash && gc++ < ghash_blocks) + ghash_mul_next (gd, u8x16_reflect (d[2]), Hi[2]); /* AES rounds 6 and 7 */ aes_gcm_enc_round (r, rk[6], n); aes_gcm_enc_round (r, rk[7], n); /* GHASH multiply block 4 */ - if (with_ghash && hidx) - ghash_mul_next (gd, u8x16_reflect (d[didx++]), kd->Hi[--hidx]); + if (with_ghash && gc++ < ghash_blocks) + ghash_mul_next (gd, u8x16_reflect (d[3]), Hi[3]); /* AES rounds 8 and 9 */ aes_gcm_enc_round (r, rk[8], n); @@ -238,6 +240,7 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, u8x16 r[4]; ghash_data_t _gd, *gd = &_gd; const u8x16 *rk = (u8x16 *) kd->Ke; + u8x16 *Hi = (u8x16 *) kd->Hi + NUM_HI - 8; /* AES rounds 0 and 1 */ aes_gcm_enc_first_round (r, Y, ctr, rk[0], 4); @@ -248,28 +251,28 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_load (d, inv, 4, 0); /* GHASH multiply block 0 */ - ghash_mul_first (gd, u8x16_reflect (d[0]) ^ T, kd->Hi[7]); + ghash_mul_first (gd, u8x16_reflect (d[0]) ^ T, Hi[0]); /* AES rounds 2 and 3 */ aes_gcm_enc_round (r, rk[2], 4); aes_gcm_enc_round (r, rk[3], 4); /* GHASH multiply block 1 */ - ghash_mul_next (gd, u8x16_reflect (d[1]), kd->Hi[6]); + ghash_mul_next (gd, u8x16_reflect (d[1]), Hi[1]); /* AES rounds 4 and 5 */ aes_gcm_enc_round (r, rk[4], 4); aes_gcm_enc_round (r, rk[5], 4); /* GHASH multiply block 2 */ - ghash_mul_next (gd, u8x16_reflect (d[2]), kd->Hi[5]); + ghash_mul_next (gd, u8x16_reflect (d[2]), Hi[2]); /* AES rounds 6 and 7 */ aes_gcm_enc_round (r, rk[6], 4); aes_gcm_enc_round (r, rk[7], 4); /* GHASH multiply block 3 */ - ghash_mul_next (gd, u8x16_reflect (d[3]), kd->Hi[4]); + ghash_mul_next (gd, u8x16_reflect (d[3]), Hi[3]); /* AES rounds 8 and 9 */ aes_gcm_enc_round (r, rk[8], 4); @@ -290,7 +293,7 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_load (d, inv + 4, 4, 0); /* GHASH multiply block 4 */ - ghash_mul_next (gd, u8x16_reflect (d[0]), kd->Hi[3]); + ghash_mul_next (gd, u8x16_reflect (d[0]), Hi[4]); /* AES rounds 0, 1 and 2 */ aes_gcm_enc_first_round (r, Y, ctr, rk[0], 4); @@ -298,21 +301,21 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[2], 4); /* GHASH multiply block 5 */ - ghash_mul_next (gd, u8x16_reflect (d[1]), kd->Hi[2]); + ghash_mul_next (gd, u8x16_reflect (d[1]), Hi[5]); /* AES rounds 3 and 4 */ aes_gcm_enc_round (r, rk[3], 4); aes_gcm_enc_round (r, rk[4], 4); /* GHASH multiply block 6 */ - ghash_mul_next (gd, u8x16_reflect (d[2]), kd->Hi[1]); + ghash_mul_next (gd, u8x16_reflect (d[2]), Hi[6]); /* AES rounds 5 and 6 */ aes_gcm_enc_round (r, rk[5], 4); aes_gcm_enc_round (r, rk[6], 4); /* GHASH multiply block 7 */ - ghash_mul_next (gd, u8x16_reflect (d[3]), kd->Hi[0]); + ghash_mul_next (gd, u8x16_reflect (d[3]), Hi[7]); /* AES rounds 7 and 8 */ aes_gcm_enc_round (r, rk[7], 4); @@ -346,17 +349,18 @@ aes_gcm_ghash_last (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, int n_blocks, int n_bytes) { ghash_data_t _gd, *gd = &_gd; + u8x16 *Hi = (u8x16 *) kd->Hi + NUM_HI - n_blocks; if (n_bytes) d[n_blocks - 1] = aes_byte_mask (d[n_blocks - 1], n_bytes); - ghash_mul_first (gd, u8x16_reflect (d[0]) ^ T, kd->Hi[n_blocks - 1]); + ghash_mul_first (gd, u8x16_reflect (d[0]) ^ T, Hi[0]); if (n_blocks > 1) - ghash_mul_next (gd, u8x16_reflect (d[1]), kd->Hi[n_blocks - 2]); + ghash_mul_next (gd, u8x16_reflect (d[1]), Hi[1]); if (n_blocks > 2) - ghash_mul_next (gd, u8x16_reflect (d[2]), kd->Hi[n_blocks - 3]); + ghash_mul_next (gd, u8x16_reflect (d[2]), Hi[2]); if (n_blocks > 3) - ghash_mul_next (gd, u8x16_reflect (d[3]), kd->Hi[n_blocks - 4]); + ghash_mul_next (gd, u8x16_reflect (d[3]), Hi[3]); ghash_reduce (gd); ghash_reduce2 (gd); return ghash_final (gd); @@ -555,7 +559,7 @@ aes_gcm (u8x16u * in, u8x16u * out, u8x16u * addt, u8x16u * iv, u8x16u * tag, /* *INDENT-ON* */ /* interleaved computation of final ghash and E(Y0, k) */ - ghash_mul_first (gd, r ^ T, kd->Hi[0]); + ghash_mul_first (gd, r ^ T, kd->Hi[NUM_HI - 1]); r = kd->Ke[0] ^ (u8x16) Y0; for (i = 1; i < 5; i += 1) r = aes_enc_round (r, kd->Ke[i]); @@ -666,7 +670,7 @@ aes_gcm_key_exp (vnet_crypto_key_t * key, aes_key_size_t ks) /* pre-calculate H */ H = aes_encrypt_block (u8x16_splat (0), kd->Ke, ks); H = u8x16_reflect (H); - ghash_precompute (H, (u8x16 *) kd->Hi, 8); + ghash_precompute (H, (u8x16 *) kd->Hi, NUM_HI); return kd; } |