diff options
Diffstat (limited to 'src/plugins/crypto_native/aes_gcm.c')
| -rw-r--r-- | src/plugins/crypto_native/aes_gcm.c | 95 |
1 files changed, 51 insertions, 44 deletions
diff --git a/src/plugins/crypto_native/aes_gcm.c b/src/plugins/crypto_native/aes_gcm.c index 9fe0582ad44..c54f38a8140 100644 --- a/src/plugins/crypto_native/aes_gcm.c +++ b/src/plugins/crypto_native/aes_gcm.c @@ -35,6 +35,14 @@ typedef struct const u8x16 Ke[15]; } aes_gcm_key_data_t; +typedef struct +{ + u32 counter; + u32x4 Y; +} aes_gcm_counter_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) { @@ -55,26 +63,25 @@ aes_gcm_store (u8x16 * d, u8x16u * outv, int n, int n_bytes) } static_always_inline void -aes_gcm_enc_first_round (u8x16 * r, u32x4 * Y, u32 * ctr, u8x16 k, +aes_gcm_enc_first_round (u8x16 * r, aes_gcm_counter_t * ctr, u8x16 k, int n_blocks) { - static const u32x4 last_byte_one = { 0, 0, 0, 1 << 24 }; - - if (PREDICT_TRUE ((u8) ctr[0] < (256 - n_blocks))) + if (PREDICT_TRUE ((u8) ctr->counter < (256 - 2 * n_blocks))) { for (int i = 0; i < n_blocks; i++) { - Y[0] += last_byte_one; - r[i] = k ^ (u8x16) Y[0]; + r[i] = k ^ (u8x16) ctr->Y; + ctr->Y += ctr_inv_1; } - ctr[0] += n_blocks; + ctr->counter += n_blocks; } else { for (int i = 0; i < n_blocks; i++) { - Y[0][3] = clib_host_to_net_u32 (++ctr[0]); - r[i] = k ^ (u8x16) Y[0]; + r[i] = k ^ (u8x16) ctr->Y; + ctr->counter++; + ctr->Y[3] = clib_host_to_net_u32 (ctr->counter + 1); } } } @@ -155,7 +162,7 @@ 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, - u32x4 * Y, u32 * ctr, u8x16u * inv, u8x16u * outv, + aes_gcm_counter_t * ctr, u8x16u * inv, u8x16u * outv, int rounds, int n, int last_block_bytes, int with_ghash, int is_encrypt) { @@ -168,7 +175,7 @@ aes_gcm_calc (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, clib_prefetch_load (inv + 4); /* AES rounds 0 and 1 */ - aes_gcm_enc_first_round (r, Y, ctr, rk[0], n); + aes_gcm_enc_first_round (r, ctr, rk[0], n); aes_gcm_enc_round (r, rk[1], n); /* load data - decrypt round */ @@ -234,7 +241,7 @@ 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, - u32x4 * Y, u32 * ctr, u8x16u * inv, u8x16u * outv, + aes_gcm_counter_t * ctr, u8x16u * inv, u8x16u * outv, int rounds, int is_encrypt) { u8x16 r[4]; @@ -243,7 +250,7 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, u8x16 *Hi = (u8x16 *) kd->Hi + NUM_HI - 8; /* AES rounds 0 and 1 */ - aes_gcm_enc_first_round (r, Y, ctr, rk[0], 4); + aes_gcm_enc_first_round (r, ctr, rk[0], 4); aes_gcm_enc_round (r, rk[1], 4); /* load 4 blocks of data - decrypt round */ @@ -296,7 +303,7 @@ aes_gcm_calc_double (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, 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); + aes_gcm_enc_first_round (r, ctr, rk[0], 4); aes_gcm_enc_round (r, rk[1], 4); aes_gcm_enc_round (r, rk[2], 4); @@ -368,11 +375,10 @@ aes_gcm_ghash_last (u8x16 T, aes_gcm_key_data_t * kd, u8x16 * d, static_always_inline u8x16 -aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, - u8x16u * outv, u32 n_left, int rounds) +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]; - u32 ctr = 1; if (n_left == 0) return T; @@ -382,34 +388,34 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, if (n_left > 48) { n_left &= 0x0f; - aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, n_left, + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, n_left, /* with_ghash */ 0, /* is_encrypt */ 1); 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, &Y, &ctr, inv, outv, rounds, 3, n_left, + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 3, n_left, /* with_ghash */ 0, /* is_encrypt */ 1); 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, &Y, &ctr, inv, outv, rounds, 2, n_left, + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 2, n_left, /* with_ghash */ 0, /* is_encrypt */ 1); return aes_gcm_ghash_last (T, kd, d, 2, n_left); } else { n_left &= 0x0f; - aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 1, n_left, + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, /* with_ghash */ 0, /* is_encrypt */ 1); return aes_gcm_ghash_last (T, kd, d, 1, n_left); } } - aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, 0, + aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, /* with_ghash */ 0, /* is_encrypt */ 1); /* next */ @@ -419,7 +425,7 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, while (n_left >= 128) { - T = aes_gcm_calc_double (T, kd, d, &Y, &ctr, inv, outv, rounds, + T = aes_gcm_calc_double (T, kd, d, ctr, inv, outv, rounds, /* is_encrypt */ 1); /* next */ @@ -430,7 +436,7 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, if (n_left >= 64) { - T = aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, 0, + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, /* with_ghash */ 1, /* is_encrypt */ 1); /* next */ @@ -445,7 +451,7 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, if (n_left > 48) { n_left &= 0x0f; - T = aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, n_left, + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, n_left, /* with_ghash */ 1, /* is_encrypt */ 1); return aes_gcm_ghash_last (T, kd, d, 4, n_left); } @@ -453,7 +459,7 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, if (n_left > 32) { n_left &= 0x0f; - T = aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 3, n_left, + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 3, n_left, /* with_ghash */ 1, /* is_encrypt */ 1); return aes_gcm_ghash_last (T, kd, d, 3, n_left); } @@ -461,27 +467,26 @@ aes_gcm_enc (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, if (n_left > 16) { n_left &= 0x0f; - T = aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 2, n_left, + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 2, n_left, /* with_ghash */ 1, /* is_encrypt */ 1); return aes_gcm_ghash_last (T, kd, d, 2, n_left); } n_left &= 0x0f; - T = aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 1, n_left, + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, /* with_ghash */ 1, /* is_encrypt */ 1); return aes_gcm_ghash_last (T, kd, d, 1, n_left); } static_always_inline u8x16 -aes_gcm_dec (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, - u8x16u * outv, u32 n_left, int rounds) +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]; - u32 ctr = 1; while (n_left >= 128) { - T = aes_gcm_calc_double (T, kd, d, &Y, &ctr, inv, outv, rounds, + T = aes_gcm_calc_double (T, kd, d, ctr, inv, outv, rounds, /* is_encrypt */ 0); /* next */ @@ -492,7 +497,7 @@ aes_gcm_dec (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, if (n_left >= 64) { - T = aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 4, 0, 1, 0); + T = aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 4, 0, 1, 0); /* next */ n_left -= 64; @@ -504,18 +509,18 @@ aes_gcm_dec (u8x16 T, aes_gcm_key_data_t * kd, u32x4 Y, u8x16u * inv, return T; if (n_left > 48) - return aes_gcm_calc (T, kd, d, &Y, &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, + /* with_ghash */ 1, /* is_encrypt */ 0); if (n_left > 32) - return aes_gcm_calc (T, kd, d, &Y, &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, + /* with_ghash */ 1, /* is_encrypt */ 0); if (n_left > 16) - return aes_gcm_calc (T, kd, d, &Y, &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, + /* with_ghash */ 1, /* is_encrypt */ 0); - return aes_gcm_calc (T, kd, d, &Y, &ctr, inv, outv, rounds, 1, n_left, + return aes_gcm_calc (T, kd, d, ctr, inv, outv, rounds, 1, n_left, /* with_ghash */ 1, /* is_encrypt */ 0); } @@ -528,6 +533,7 @@ aes_gcm (u8x16u * in, u8x16u * out, u8x16u * addt, u8x16u * iv, u8x16u * tag, u8x16 r, T = { }; u32x4 Y0; ghash_data_t _gd, *gd = &_gd; + aes_gcm_counter_t _ctr, *ctr = &_ctr; clib_prefetch_load (iv); clib_prefetch_load (in); @@ -542,14 +548,15 @@ aes_gcm (u8x16u * in, u8x16u * out, u8x16u * addt, u8x16u * iv, u8x16u * tag, T = aes_gcm_ghash (T, kd, addt, aad_bytes); /* initalize counter */ - Y0 = (u32x4) aes_load_partial (iv, 12); - Y0[3] = clib_host_to_net_u32 (1); + ctr->counter = 1; + Y0 = (u32x4) aes_load_partial (iv, 12) + ctr_inv_1; + ctr->Y = Y0 + ctr_inv_1; /* ghash and encrypt/edcrypt */ if (is_encrypt) - T = aes_gcm_enc (T, kd, Y0, in, out, data_bytes, aes_rounds); + T = aes_gcm_enc (T, kd, ctr, in, out, data_bytes, aes_rounds); else - T = aes_gcm_dec (T, kd, Y0, in, out, data_bytes, aes_rounds); + T = aes_gcm_dec (T, kd, ctr, in, out, data_bytes, aes_rounds); clib_prefetch_load (tag); |