const u8x16 Ke[15];
} aes_gcm_key_data_t;
-static_always_inline void
-aes_gcm_load (u8x16 * d, u8x16u * inv, int n, int n_bytes)
+typedef struct
{
- 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];
-}
+ u32 counter;
+ u32x4 Y;
+} aes_gcm_counter_t;
-static_always_inline void
-aes_gcm_store (u8x16 * d, u8x16u * outv, int n, int n_bytes)
+typedef enum
{
- 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];
-}
+ 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_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);
}
}
}
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,
- int rounds, int n, int last_block_bytes, int with_ghash,
- int is_encrypt)
+ aes_gcm_counter_t * ctr, u8x16u * inv, u8x16u * outv,
+ 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);
/* 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 */
- 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 */
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 */
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 */
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 */
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;
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,
- int rounds, int is_encrypt)
+ aes_gcm_counter_t * ctr, u8x16u * inv, u8x16u * outv,
+ int rounds, aes_gcm_flags_t f)
{
u8x16 r[4];
ghash_data_t _gd, *gd = &_gd;
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 */
- 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]);
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]);
/* 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);
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);
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);
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;
+ 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, &Y, &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, &Y, &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, &Y, &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, &Y, &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, &Y, &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, &Y, &ctr, inv, outv, rounds,
- /* is_encrypt */ 1);
+ T = aes_gcm_calc_double (T, kd, d, ctr, inv, outv, rounds, f);
/* next */
n_left -= 128;
if (n_left >= 64)
{
- T = aes_gcm_calc (T, kd, d, &Y, &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;
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, &Y, &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, &Y, &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, &Y, &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, &Y, &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);
}
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;
+ 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, &Y, &ctr, inv, outv, rounds,
- /* is_encrypt */ 0);
+ T = aes_gcm_calc_double (T, kd, d, ctr, inv, outv, rounds, f);
/* next */
n_left -= 128;
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, f);
/* next */
n_left -= 64;
if (n_left == 0)
return T;
+ f |= AES_GCM_F_LAST_ROUND;
+
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, f);
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, f);
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, f);
- return aes_gcm_calc (T, kd, d, &Y, &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
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);
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);
Code Review / vpp.git / blobdiff