diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/plugins/crypto_native/aes_gcm.c | 191 |
1 files changed, 107 insertions, 84 deletions
diff --git a/src/plugins/crypto_native/aes_gcm.c b/src/plugins/crypto_native/aes_gcm.c index c54f38a8140..cb4590085c0 100644 --- a/src/plugins/crypto_native/aes_gcm.c +++ b/src/plugins/crypto_native/aes_gcm.c @@ -41,26 +41,17 @@ typedef struct u32x4 Y; } aes_gcm_counter_t; +typedef enum +{ + AES_GCM_F_WITH_GHASH = (1 << 0), + AES_GCM_F_LAST_ROUND = (1 << 1), + AES_GCM_F_ENCRYPT = (1 << 2), + AES_GCM_F_DECRYPT = (1 << 3), +} aes_gcm_flags_t; + static const u32x4 ctr_inv_1 = { 0, 0, 0, 1 << 24 }; -static_always_inline void -aes_gcm_load (u8x16 * d, u8x16u * inv, int n, int n_bytes) -{ - for (int i = 0; i < n - 1; i++) - d[i] = inv[i]; - d[n - 1] = n_bytes ? aes_load_partial (inv + n - 1, n_bytes) : inv[n - 1]; -} -static_always_inline void -aes_gcm_store (u8x16 * d, u8x16u * outv, int n, int n_bytes) -{ - for (int i = 0; i < n - 1; i++) - outv[i] = d[i]; - if (n_bytes & 0xf) - aes_store_partial (outv + n - 1, d[n - 1], n_bytes); - else - outv[n - 1] = d[n - 1]; -} static_always_inline void aes_gcm_enc_first_round (u8x16 * r, aes_gcm_counter_t * ctr, u8x16 k, @@ -163,13 +154,12 @@ aes_gcm_ghash (u8x16 T, aes_gcm_key_data_t * kd, u8x16u * in, u32 n_left) static_always_inline u8x16 aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_counter_t * ctr, u8x16u * inv, u8x16u * outv, - int rounds, int n, int last_block_bytes, int with_ghash, - int is_encrypt) + int rounds, int n, int last_block_bytes, aes_gcm_flags_t f) { u8x16 r[n]; ghash_data_t _gd = { }, *gd = &_gd; const u8x16 *rk = (u8x16 *) kd->Ke; - int ghash_blocks = is_encrypt ? 4 : n, gc = 1; + int ghash_blocks = (f & AES_GCM_F_ENCRYPT) ? 4 : n, gc = 1; u8x16 *Hi = (u8x16 *) kd->Hi + NUM_HI - ghash_blocks; clib_prefetch_load (inv + 4); @@ -179,11 +169,17 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[1], n); /* load data - decrypt round */ - if (is_encrypt == 0) - aes_gcm_load (d, inv, n, last_block_bytes); + if (f & AES_GCM_F_DECRYPT) + { + for (int i = 0; i < n - ((f & AES_GCM_F_LAST_ROUND) != 0); i++) + d[i] = inv[i]; + + if (f & AES_GCM_F_LAST_ROUND) + d[n - 1] = aes_load_partial (inv + n - 1, last_block_bytes); + } /* GHASH multiply block 1 */ - if (with_ghash) + if (f & AES_GCM_F_WITH_GHASH) ghash_mul_first (gd, u8x16_reflect (d[0]) ^ T, Hi[0]); /* AES rounds 2 and 3 */ @@ -191,7 +187,7 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[3], n); /* GHASH multiply block 2 */ - if (with_ghash && gc++ < ghash_blocks) + if ((f & AES_GCM_F_WITH_GHASH) && gc++ < ghash_blocks) ghash_mul_next (gd, u8x16_reflect (d[1]), Hi[1]); /* AES rounds 4 and 5 */ @@ -199,7 +195,7 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[5], n); /* GHASH multiply block 3 */ - if (with_ghash && gc++ < ghash_blocks) + if ((f & AES_GCM_F_WITH_GHASH) && gc++ < ghash_blocks) ghash_mul_next (gd, u8x16_reflect (d[2]), Hi[2]); /* AES rounds 6 and 7 */ @@ -207,7 +203,7 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[7], n); /* GHASH multiply block 4 */ - if (with_ghash && gc++ < ghash_blocks) + if ((f & AES_GCM_F_WITH_GHASH) && gc++ < ghash_blocks) ghash_mul_next (gd, u8x16_reflect (d[3]), Hi[3]); /* AES rounds 8 and 9 */ @@ -215,25 +211,35 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[9], n); /* GHASH reduce 1st step */ - if (with_ghash) + if (f & AES_GCM_F_WITH_GHASH) ghash_reduce (gd); /* load data - encrypt round */ - if (is_encrypt) - aes_gcm_load (d, inv, n, last_block_bytes); + if (f & AES_GCM_F_ENCRYPT) + { + for (int i = 0; i < n - ((f & AES_GCM_F_LAST_ROUND) != 0); i++) + d[i] = inv[i]; + + if (f & AES_GCM_F_LAST_ROUND) + d[n - 1] = aes_load_partial (inv + n - 1, last_block_bytes); + } /* GHASH reduce 2nd step */ - if (with_ghash) + if (f & AES_GCM_F_WITH_GHASH) ghash_reduce2 (gd); /* AES last round(s) */ aes_gcm_enc_last_round (r, d, rk, rounds, n); /* store data */ - aes_gcm_store (d, outv, n, last_block_bytes); + for (int i = 0; i < n - ((f & AES_GCM_F_LAST_ROUND) != 0); i++) + outv[i] = d[i]; + + if (f & AES_GCM_F_LAST_ROUND) + aes_store_partial (outv + n - 1, d[n - 1], last_block_bytes); /* GHASH final step */ - if (with_ghash) + if (f & AES_GCM_F_WITH_GHASH) T = ghash_final (gd); return T; @@ -242,7 +248,7 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, static_always_inline u8x16 aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_counter_t * ctr, u8x16u * inv, u8x16u * outv, - int rounds, int is_encrypt) + int rounds, aes_gcm_flags_t f) { u8x16 r[4]; ghash_data_t _gd, *gd = &_gd; @@ -254,8 +260,13 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[1], 4); /* load 4 blocks of data - decrypt round */ - if (is_encrypt == 0) - aes_gcm_load (d, inv, 4, 0); + if (f & AES_GCM_F_DECRYPT) + { + d[0] = inv[0]; + d[1] = inv[1]; + d[2] = inv[2]; + d[3] = inv[3]; + } /* GHASH multiply block 0 */ ghash_mul_first (gd, u8x16_reflect (d[0]) ^ T, Hi[0]); @@ -286,18 +297,31 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[9], 4); /* load 4 blocks of data - encrypt round */ - if (is_encrypt) - aes_gcm_load (d, inv, 4, 0); + if (f & AES_GCM_F_ENCRYPT) + { + d[0] = inv[0]; + d[1] = inv[1]; + d[2] = inv[2]; + d[3] = inv[3]; + } /* AES last round(s) */ aes_gcm_enc_last_round (r, d, rk, rounds, 4); /* store 4 blocks of data */ - aes_gcm_store (d, outv, 4, 0); + outv[0] = d[0]; + outv[1] = d[1]; + outv[2] = d[2]; + outv[3] = d[3]; /* load next 4 blocks of data data - decrypt round */ - if (is_encrypt == 0) - aes_gcm_load (d, inv + 4, 4, 0); + if (f & AES_GCM_F_DECRYPT) + { + d[0] = inv[4]; + d[1] = inv[5]; + d[2] = inv[6]; + d[3] = inv[7]; + } /* GHASH multiply block 4 */ ghash_mul_next (gd, u8x16_reflect (d[0]), Hi[4]); @@ -335,8 +359,13 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_round (r, rk[9], 4); /* load data - encrypt round */ - if (is_encrypt) - aes_gcm_load (d, inv + 4, 4, 0); + if (f & AES_GCM_F_ENCRYPT) + { + d[0] = inv[4]; + d[1] = inv[5]; + d[2] = inv[6]; + d[3] = inv[7]; + } /* GHASH reduce 2nd step */ ghash_reduce2 (gd); @@ -345,7 +374,10 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, aes_gcm_enc_last_round (r, d, rk, rounds, 4); /* store data */ - aes_gcm_store (d, outv + 4, 4, 0); + outv[4] = d[0]; + outv[5] = d[1]; + outv[6] = d[2]; + outv[7] = d[3]; /* GHASH final step */ return ghash_final (gd); @@ -379,54 +411,51 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, aes_gcm_counter_t * ctr, u8x16u * inv, u8x16u * outv, u32 n_left, int rounds) { u8x16 d[4]; + aes_gcm_flags_t f = AES_GCM_F_ENCRYPT; if (n_left == 0) return T; if (n_left < 64) { + f |= AES_GCM_F_LAST_ROUND; if (n_left > 48) { - n_left &= 0x0f; - aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, n_left, - /* with_ghash */ 0, /* is_encrypt */ 1); + n_left -= 48; + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, n_left, f); return aes_gcm_ghash_last (T, kd, d, 4, n_left); } else if (n_left > 32) { - n_left &= 0x0f; - aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 3, n_left, - /* with_ghash */ 0, /* is_encrypt */ 1); + n_left -= 32; + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 3, n_left, f); return aes_gcm_ghash_last (T, kd, d, 3, n_left); } else if (n_left > 16) { - n_left &= 0x0f; - aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 2, n_left, - /* with_ghash */ 0, /* is_encrypt */ 1); + n_left -= 16; + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 2, n_left, f); return aes_gcm_ghash_last (T, kd, d, 2, n_left); } else { - n_left &= 0x0f; - aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, - /* with_ghash */ 0, /* is_encrypt */ 1); + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, f); return aes_gcm_ghash_last (T, kd, d, 1, n_left); } } - aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, - /* with_ghash */ 0, /* is_encrypt */ 1); + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, f); /* next */ n_left -= 64; outv += 4; inv += 4; + f |= AES_GCM_F_WITH_GHASH; + while (n_left >= 128) { - T = aes_gcm_calc_double (T, kd, d, ctr, inv, outv, rounds, - /* is_encrypt */ 1); + T = aes_gcm_calc_double (T, kd, d, ctr, inv, outv, rounds, f); /* next */ n_left -= 128; @@ -436,8 +465,7 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, aes_gcm_counter_t * ctr, if (n_left >= 64) { - T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, - /* with_ghash */ 1, /* is_encrypt */ 1); + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, f); /* next */ n_left -= 64; @@ -448,33 +476,30 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, aes_gcm_counter_t * ctr, if (n_left == 0) return aes_gcm_ghash_last (T, kd, d, 4, 0); + f |= AES_GCM_F_LAST_ROUND; + if (n_left > 48) { - n_left &= 0x0f; - T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, n_left, - /* with_ghash */ 1, /* is_encrypt */ 1); + n_left -= 48; + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, n_left, f); return aes_gcm_ghash_last (T, kd, d, 4, n_left); } if (n_left > 32) { - n_left &= 0x0f; - T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 3, n_left, - /* with_ghash */ 1, /* is_encrypt */ 1); + n_left -= 32; + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 3, n_left, f); return aes_gcm_ghash_last (T, kd, d, 3, n_left); } if (n_left > 16) { - n_left &= 0x0f; - T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 2, n_left, - /* with_ghash */ 1, /* is_encrypt */ 1); + n_left -= 16; + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 2, n_left, f); return aes_gcm_ghash_last (T, kd, d, 2, n_left); } - n_left &= 0x0f; - T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, - /* with_ghash */ 1, /* is_encrypt */ 1); + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, f); return aes_gcm_ghash_last (T, kd, d, 1, n_left); } @@ -483,11 +508,11 @@ aes_gcm_dec (u8x16 T, aes_gcm_key_data_t * kd, aes_gcm_counter_t * ctr, u8x16u * inv, u8x16u * outv, u32 n_left, int rounds) { u8x16 d[8]; + aes_gcm_flags_t f = AES_GCM_F_WITH_GHASH | AES_GCM_F_DECRYPT; while (n_left >= 128) { - T = aes_gcm_calc_double (T, kd, d, ctr, inv, outv, rounds, - /* is_encrypt */ 0); + T = aes_gcm_calc_double (T, kd, d, ctr, inv, outv, rounds, f); /* next */ n_left -= 128; @@ -497,7 +522,7 @@ aes_gcm_dec (u8x16 T, aes_gcm_key_data_t * kd, aes_gcm_counter_t * ctr, if (n_left >= 64) { - T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, 1, 0); + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, f); /* next */ n_left -= 64; @@ -508,20 +533,18 @@ aes_gcm_dec (u8x16 T, aes_gcm_key_data_t * kd, aes_gcm_counter_t * ctr, if (n_left == 0) return T; + f |= AES_GCM_F_LAST_ROUND; + if (n_left > 48) - return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, n_left - 48, - /* with_ghash */ 1, /* is_encrypt */ 0); + return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, n_left - 48, f); if (n_left > 32) - return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 3, n_left - 32, - /* with_ghash */ 1, /* is_encrypt */ 0); + return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 3, n_left - 32, f); if (n_left > 16) - return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 2, n_left - 16, - /* with_ghash */ 1, /* is_encrypt */ 0); + return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 2, n_left - 16, f); - return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, - /* with_ghash */ 1, /* is_encrypt */ 0); + return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, f); } static_always_inline int |