denozord/strongswan-ext
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

aesni: Use separate en-/decryption CBC code paths for different key sizes

Browse Source 
This allows us to unroll loops, and use local (register) variables for the
key schedule. This improves performance slightly for encryption, but a lot
for reorderable decryption (>30%).
This commit is contained in:
Martin Willi
2015-04-15 11:35:27 +02:00
parent 8f1fab93e9
commit 95ef361415
1 changed files with 290 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/libstrongswan/plugins/aesni/aesni_cbc.c
+290 -22
View File
@@ -60,13 +60,26 @@ struct private_aesni_cbc_t {
};
/**
* Generic CBC encryption
* AES-128 CBC encryption
*/
static void encrypt_cbc(aesni_key_t *key, u_int blocks, u_char *in,
u_char *iv, u_char *out)
static void encrypt_cbc128(aesni_key_t *key, u_int blocks, u_char *in,
u_char *iv, u_char *out)
{
__m128i k0, k1, k2, k3, k4, k5, k6, k7, k8, k9, k10;
__m128i t, fb, *bi, *bo;
int i, round;
int i;
k0 = key->schedule[0];
k1 = key->schedule[1];
k2 = key->schedule[2];
k3 = key->schedule[3];
k4 = key->schedule[4];
k5 = key->schedule[5];
k6 = key->schedule[6];
k7 = key->schedule[7];
k8 = key->schedule[8];
k9 = key->schedule[9];
k10 = key->schedule[10];
bi = (__m128i*)in;
bo = (__m128i*)out;
@@ -76,24 +89,44 @@ static void encrypt_cbc(aesni_key_t *key, u_int blocks, u_char *in,
{
t = _mm_loadu_si128(bi + i);
fb = _mm_xor_si128(t, fb);
fb = _mm_xor_si128(fb, key->schedule[0]);
for (round = 1; round < key->rounds; round++)
{
fb = _mm_aesenc_si128(fb, key->schedule[round]);
}
fb = _mm_aesenclast_si128(fb, key->schedule[key->rounds]);
fb = _mm_xor_si128(fb, k0);
fb = _mm_aesenc_si128(fb, k1);
fb = _mm_aesenc_si128(fb, k2);
fb = _mm_aesenc_si128(fb, k3);
fb = _mm_aesenc_si128(fb, k4);
fb = _mm_aesenc_si128(fb, k5);
fb = _mm_aesenc_si128(fb, k6);
fb = _mm_aesenc_si128(fb, k7);
fb = _mm_aesenc_si128(fb, k8);
fb = _mm_aesenc_si128(fb, k9);
fb = _mm_aesenclast_si128(fb, k10);
_mm_storeu_si128(bo + i, fb);
}
}
/**
* Generic CBC decryption
* AES-128 CBC decryption
*/
static void decrypt_cbc(aesni_key_t *key, u_int blocks, u_char *in,
u_char *iv, u_char *out)
static void decrypt_cbc128(aesni_key_t *key, u_int blocks, u_char *in,
u_char *iv, u_char *out)
{
__m128i k0, k1, k2, k3, k4, k5, k6, k7, k8, k9, k10;
__m128i t, fb, last, *bi, *bo;
int i, round;
int i;
k0 = key->schedule[0];
k1 = key->schedule[1];
k2 = key->schedule[2];
k3 = key->schedule[3];
k4 = key->schedule[4];
k5 = key->schedule[5];
k6 = key->schedule[6];
k7 = key->schedule[7];
k8 = key->schedule[8];
k9 = key->schedule[9];
k10 = key->schedule[10];
bi = (__m128i*)in;
bo = (__m128i*)out;
@@ -102,12 +135,233 @@ static void decrypt_cbc(aesni_key_t *key, u_int blocks, u_char *in,
for (i = 0; i < blocks; i++)
{
last = _mm_loadu_si128(bi + i);
t = _mm_xor_si128(last, key->schedule[0]);
for (round = 1; round < key->rounds; round++)
{
t = _mm_aesdec_si128(t, key->schedule[round]);
}
t = _mm_aesdeclast_si128(t, key->schedule[key->rounds]);
t = _mm_xor_si128(last, k0);
t = _mm_aesdec_si128(t, k1);
t = _mm_aesdec_si128(t, k2);
t = _mm_aesdec_si128(t, k3);
t = _mm_aesdec_si128(t, k4);
t = _mm_aesdec_si128(t, k5);
t = _mm_aesdec_si128(t, k6);
t = _mm_aesdec_si128(t, k7);
t = _mm_aesdec_si128(t, k8);
t = _mm_aesdec_si128(t, k9);
t = _mm_aesdeclast_si128(t, k10);
t = _mm_xor_si128(t, fb);
_mm_storeu_si128(bo + i, t);
fb = last;
}
}
/**
* AES-192 CBC encryption
*/
static void encrypt_cbc192(aesni_key_t *key, u_int blocks, u_char *in,
u_char *iv, u_char *out)
{
__m128i k0, k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12;
__m128i t, fb, *bi, *bo;
int i;
k0 = key->schedule[0];
k1 = key->schedule[1];
k2 = key->schedule[2];
k3 = key->schedule[3];
k4 = key->schedule[4];
k5 = key->schedule[5];
k6 = key->schedule[6];
k7 = key->schedule[7];
k8 = key->schedule[8];
k9 = key->schedule[9];
k10 = key->schedule[10];
k11 = key->schedule[11];
k12 = key->schedule[12];
bi = (__m128i*)in;
bo = (__m128i*)out;
fb = _mm_loadu_si128((__m128i*)iv);
for (i = 0; i < blocks; i++)
{
t = _mm_loadu_si128(bi + i);
fb = _mm_xor_si128(t, fb);
fb = _mm_xor_si128(fb, k0);
fb = _mm_aesenc_si128(fb, k1);
fb = _mm_aesenc_si128(fb, k2);
fb = _mm_aesenc_si128(fb, k3);
fb = _mm_aesenc_si128(fb, k4);
fb = _mm_aesenc_si128(fb, k5);
fb = _mm_aesenc_si128(fb, k6);
fb = _mm_aesenc_si128(fb, k7);
fb = _mm_aesenc_si128(fb, k8);
fb = _mm_aesenc_si128(fb, k9);
fb = _mm_aesenc_si128(fb, k10);
fb = _mm_aesenc_si128(fb, k11);
fb = _mm_aesenclast_si128(fb, k12);
_mm_storeu_si128(bo + i, fb);
}
}
/**
* AES-192 CBC decryption
*/
static void decrypt_cbc192(aesni_key_t *key, u_int blocks, u_char *in,
u_char *iv, u_char *out)
{
__m128i k0, k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12;
__m128i t, fb, last, *bi, *bo;
int i;
k0 = key->schedule[0];
k1 = key->schedule[1];
k2 = key->schedule[2];
k3 = key->schedule[3];
k4 = key->schedule[4];
k5 = key->schedule[5];
k6 = key->schedule[6];
k7 = key->schedule[7];
k8 = key->schedule[8];
k9 = key->schedule[9];
k10 = key->schedule[10];
k11 = key->schedule[11];
k12 = key->schedule[12];
bi = (__m128i*)in;
bo = (__m128i*)out;
fb = _mm_loadu_si128((__m128i*)iv);
for (i = 0; i < blocks; i++)
{
last = _mm_loadu_si128(bi + i);
t = _mm_xor_si128(last, k0);
t = _mm_aesdec_si128(t, k1);
t = _mm_aesdec_si128(t, k2);
t = _mm_aesdec_si128(t, k3);
t = _mm_aesdec_si128(t, k4);
t = _mm_aesdec_si128(t, k5);
t = _mm_aesdec_si128(t, k6);
t = _mm_aesdec_si128(t, k7);
t = _mm_aesdec_si128(t, k8);
t = _mm_aesdec_si128(t, k9);
t = _mm_aesdec_si128(t, k10);
t = _mm_aesdec_si128(t, k11);
t = _mm_aesdeclast_si128(t, k12);
t = _mm_xor_si128(t, fb);
_mm_storeu_si128(bo + i, t);
fb = last;
}
}
/**
* AES-256 CBC encryption
*/
static void encrypt_cbc256(aesni_key_t *key, u_int blocks, u_char *in,
u_char *iv, u_char *out)
{
__m128i k0, k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12, k13, k14;
__m128i t, fb, *bi, *bo;
int i;
k0 = key->schedule[0];
k1 = key->schedule[1];
k2 = key->schedule[2];
k3 = key->schedule[3];
k4 = key->schedule[4];
k5 = key->schedule[5];
k6 = key->schedule[6];
k7 = key->schedule[7];
k8 = key->schedule[8];
k9 = key->schedule[9];
k10 = key->schedule[10];
k11 = key->schedule[11];
k12 = key->schedule[12];
k13 = key->schedule[13];
k14 = key->schedule[14];
bi = (__m128i*)in;
bo = (__m128i*)out;
fb = _mm_loadu_si128((__m128i*)iv);
for (i = 0; i < blocks; i++)
{
t = _mm_loadu_si128(bi + i);
fb = _mm_xor_si128(t, fb);
fb = _mm_xor_si128(fb, k0);
fb = _mm_aesenc_si128(fb, k1);
fb = _mm_aesenc_si128(fb, k2);
fb = _mm_aesenc_si128(fb, k3);
fb = _mm_aesenc_si128(fb, k4);
fb = _mm_aesenc_si128(fb, k5);
fb = _mm_aesenc_si128(fb, k6);
fb = _mm_aesenc_si128(fb, k7);
fb = _mm_aesenc_si128(fb, k8);
fb = _mm_aesenc_si128(fb, k9);
fb = _mm_aesenc_si128(fb, k10);
fb = _mm_aesenc_si128(fb, k11);
fb = _mm_aesenc_si128(fb, k12);
fb = _mm_aesenc_si128(fb, k13);
fb = _mm_aesenclast_si128(fb, k14);
_mm_storeu_si128(bo + i, fb);
}
}
/**
* AES-256 CBC decryption
*/
static void decrypt_cbc256(aesni_key_t *key, u_int blocks, u_char *in,
u_char *iv, u_char *out)
{
__m128i k0, k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k11, k12, k13, k14;
__m128i t, fb, last, *bi, *bo;
int i;
k0 = key->schedule[0];
k1 = key->schedule[1];
k2 = key->schedule[2];
k3 = key->schedule[3];
k4 = key->schedule[4];
k5 = key->schedule[5];
k6 = key->schedule[6];
k7 = key->schedule[7];
k8 = key->schedule[8];
k9 = key->schedule[9];
k10 = key->schedule[10];
k11 = key->schedule[11];
k12 = key->schedule[12];
k13 = key->schedule[13];
k14 = key->schedule[14];
bi = (__m128i*)in;
bo = (__m128i*)out;
fb = _mm_loadu_si128((__m128i*)iv);
for (i = 0; i < blocks; i++)
{
last = _mm_loadu_si128(bi + i);
t = _mm_xor_si128(last, k0);
t = _mm_aesdec_si128(t, k1);
t = _mm_aesdec_si128(t, k2);
t = _mm_aesdec_si128(t, k3);
t = _mm_aesdec_si128(t, k4);
t = _mm_aesdec_si128(t, k5);
t = _mm_aesdec_si128(t, k6);
t = _mm_aesdec_si128(t, k7);
t = _mm_aesdec_si128(t, k8);
t = _mm_aesdec_si128(t, k9);
t = _mm_aesdec_si128(t, k10);
t = _mm_aesdec_si128(t, k11);
t = _mm_aesdec_si128(t, k12);
t = _mm_aesdec_si128(t, k13);
t = _mm_aesdeclast_si128(t, k14);
t = _mm_xor_si128(t, fb);
_mm_storeu_si128(bo + i, t);
fb = last;
@@ -231,9 +485,23 @@ aesni_cbc_t *aesni_cbc_create(encryption_algorithm_t algo, size_t key_size)
},
},
.key_size = key_size,
.encrypt = encrypt_cbc,
.decrypt = decrypt_cbc,
);
switch (key_size)
{
case 16:
this->encrypt = encrypt_cbc128;
this->decrypt = decrypt_cbc128;
break;
case 24:
this->encrypt = encrypt_cbc192;
this->decrypt = decrypt_cbc192;
break;
case 32:
this->encrypt = encrypt_cbc256;
this->decrypt = decrypt_cbc256;
break;
}
return &this->public;
}