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yaml
---
r: 91655
b: refs/heads/master
c: 7dc748e
h: refs/heads/master
i:
  91653: d84ad0c
  91651: 22a58fc
  91647: 1e16c17
v: v3
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Sebastian Siewior authored and Herbert Xu committed Apr 21, 2008
1 parent 68ef5ca commit eec4ea3
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2 changes: 1 addition & 1 deletion [refs]
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@@ -1,2 +1,2 @@
---
refs/heads/master: 5427663f498e19b441277de72ce7a685511f247c
refs/heads/master: 7dc748e4e720c1a98185363096ad7582e9113092
1 change: 1 addition & 0 deletions trunk/drivers/crypto/Kconfig
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Expand Up @@ -27,6 +27,7 @@ config CRYPTO_DEV_PADLOCK_AES
tristate "PadLock driver for AES algorithm"
depends on CRYPTO_DEV_PADLOCK
select CRYPTO_BLKCIPHER
select CRYPTO_AES
help
Use VIA PadLock for AES algorithm.

Expand Down
320 changes: 19 additions & 301 deletions trunk/drivers/crypto/padlock-aes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5,42 +5,6 @@
*
* Copyright (c) 2004 Michal Ludvig <michal@logix.cz>
*
* Key expansion routine taken from crypto/aes_generic.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* ---------------------------------------------------------------------------
* Copyright (c) 2002, Dr Brian Gladman <brg@gladman.me.uk>, Worcester, UK.
* All rights reserved.
*
* LICENSE TERMS
*
* The free distribution and use of this software in both source and binary
* form is allowed (with or without changes) provided that:
*
* 1. distributions of this source code include the above copyright
* notice, this list of conditions and the following disclaimer;
*
* 2. distributions in binary form include the above copyright
* notice, this list of conditions and the following disclaimer
* in the documentation and/or other associated materials;
*
* 3. the copyright holder's name is not used to endorse products
* built using this software without specific written permission.
*
* ALTERNATIVELY, provided that this notice is retained in full, this product
* may be distributed under the terms of the GNU General Public License (GPL),
* in which case the provisions of the GPL apply INSTEAD OF those given above.
*
* DISCLAIMER
*
* This software is provided 'as is' with no explicit or implied warranties
* in respect of its properties, including, but not limited to, correctness
* and/or fitness for purpose.
* ---------------------------------------------------------------------------
*/

#include <crypto/algapi.h>
Expand All @@ -54,9 +18,6 @@
#include <asm/byteorder.h>
#include "padlock.h"

#define AES_EXTENDED_KEY_SIZE 64 /* in uint32_t units */
#define AES_EXTENDED_KEY_SIZE_B (AES_EXTENDED_KEY_SIZE * sizeof(uint32_t))

/* Control word. */
struct cword {
unsigned int __attribute__ ((__packed__))
Expand All @@ -70,218 +31,23 @@ struct cword {

/* Whenever making any changes to the following
* structure *make sure* you keep E, d_data
* and cword aligned on 16 Bytes boundaries!!! */
* and cword aligned on 16 Bytes boundaries and
* the Hardware can access 16 * 16 bytes of E and d_data
* (only the first 15 * 16 bytes matter but the HW reads
* more).
*/
struct aes_ctx {
u32 E[AES_MAX_KEYLENGTH_U32]
__attribute__ ((__aligned__(PADLOCK_ALIGNMENT)));
u32 d_data[AES_MAX_KEYLENGTH_U32]
__attribute__ ((__aligned__(PADLOCK_ALIGNMENT)));
struct {
struct cword encrypt;
struct cword decrypt;
} cword;
u32 *D;
int key_length;
u32 E[AES_EXTENDED_KEY_SIZE]
__attribute__ ((__aligned__(PADLOCK_ALIGNMENT)));
u32 d_data[AES_EXTENDED_KEY_SIZE]
__attribute__ ((__aligned__(PADLOCK_ALIGNMENT)));
};

/* ====== Key management routines ====== */

static inline uint32_t
generic_rotr32 (const uint32_t x, const unsigned bits)
{
const unsigned n = bits % 32;
return (x >> n) | (x << (32 - n));
}

static inline uint32_t
generic_rotl32 (const uint32_t x, const unsigned bits)
{
const unsigned n = bits % 32;
return (x << n) | (x >> (32 - n));
}

#define rotl generic_rotl32
#define rotr generic_rotr32

/*
* #define byte(x, nr) ((unsigned char)((x) >> (nr*8)))
*/
static inline uint8_t
byte(const uint32_t x, const unsigned n)
{
return x >> (n << 3);
}

#define E_KEY ctx->E
#define D_KEY ctx->D

static uint8_t pow_tab[256];
static uint8_t log_tab[256];
static uint8_t sbx_tab[256];
static uint8_t isb_tab[256];
static uint32_t rco_tab[10];
static uint32_t ft_tab[4][256];
static uint32_t it_tab[4][256];

static uint32_t fl_tab[4][256];
static uint32_t il_tab[4][256];

static inline uint8_t
f_mult (uint8_t a, uint8_t b)
{
uint8_t aa = log_tab[a], cc = aa + log_tab[b];

return pow_tab[cc + (cc < aa ? 1 : 0)];
}

#define ff_mult(a,b) (a && b ? f_mult(a, b) : 0)

#define f_rn(bo, bi, n, k) \
bo[n] = ft_tab[0][byte(bi[n],0)] ^ \
ft_tab[1][byte(bi[(n + 1) & 3],1)] ^ \
ft_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
ft_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n)

#define i_rn(bo, bi, n, k) \
bo[n] = it_tab[0][byte(bi[n],0)] ^ \
it_tab[1][byte(bi[(n + 3) & 3],1)] ^ \
it_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
it_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n)

#define ls_box(x) \
( fl_tab[0][byte(x, 0)] ^ \
fl_tab[1][byte(x, 1)] ^ \
fl_tab[2][byte(x, 2)] ^ \
fl_tab[3][byte(x, 3)] )

#define f_rl(bo, bi, n, k) \
bo[n] = fl_tab[0][byte(bi[n],0)] ^ \
fl_tab[1][byte(bi[(n + 1) & 3],1)] ^ \
fl_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
fl_tab[3][byte(bi[(n + 3) & 3],3)] ^ *(k + n)

#define i_rl(bo, bi, n, k) \
bo[n] = il_tab[0][byte(bi[n],0)] ^ \
il_tab[1][byte(bi[(n + 3) & 3],1)] ^ \
il_tab[2][byte(bi[(n + 2) & 3],2)] ^ \
il_tab[3][byte(bi[(n + 1) & 3],3)] ^ *(k + n)

static void
gen_tabs (void)
{
uint32_t i, t;
uint8_t p, q;

/* log and power tables for GF(2**8) finite field with
0x011b as modular polynomial - the simplest prmitive
root is 0x03, used here to generate the tables */

for (i = 0, p = 1; i < 256; ++i) {
pow_tab[i] = (uint8_t) p;
log_tab[p] = (uint8_t) i;

p ^= (p << 1) ^ (p & 0x80 ? 0x01b : 0);
}

log_tab[1] = 0;

for (i = 0, p = 1; i < 10; ++i) {
rco_tab[i] = p;

p = (p << 1) ^ (p & 0x80 ? 0x01b : 0);
}

for (i = 0; i < 256; ++i) {
p = (i ? pow_tab[255 - log_tab[i]] : 0);
q = ((p >> 7) | (p << 1)) ^ ((p >> 6) | (p << 2));
p ^= 0x63 ^ q ^ ((q >> 6) | (q << 2));
sbx_tab[i] = p;
isb_tab[p] = (uint8_t) i;
}

for (i = 0; i < 256; ++i) {
p = sbx_tab[i];

t = p;
fl_tab[0][i] = t;
fl_tab[1][i] = rotl (t, 8);
fl_tab[2][i] = rotl (t, 16);
fl_tab[3][i] = rotl (t, 24);

t = ((uint32_t) ff_mult (2, p)) |
((uint32_t) p << 8) |
((uint32_t) p << 16) | ((uint32_t) ff_mult (3, p) << 24);

ft_tab[0][i] = t;
ft_tab[1][i] = rotl (t, 8);
ft_tab[2][i] = rotl (t, 16);
ft_tab[3][i] = rotl (t, 24);

p = isb_tab[i];

t = p;
il_tab[0][i] = t;
il_tab[1][i] = rotl (t, 8);
il_tab[2][i] = rotl (t, 16);
il_tab[3][i] = rotl (t, 24);

t = ((uint32_t) ff_mult (14, p)) |
((uint32_t) ff_mult (9, p) << 8) |
((uint32_t) ff_mult (13, p) << 16) |
((uint32_t) ff_mult (11, p) << 24);

it_tab[0][i] = t;
it_tab[1][i] = rotl (t, 8);
it_tab[2][i] = rotl (t, 16);
it_tab[3][i] = rotl (t, 24);
}
}

#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b)

#define imix_col(y,x) \
u = star_x(x); \
v = star_x(u); \
w = star_x(v); \
t = w ^ (x); \
(y) = u ^ v ^ w; \
(y) ^= rotr(u ^ t, 8) ^ \
rotr(v ^ t, 16) ^ \
rotr(t,24)

/* initialise the key schedule from the user supplied key */

#define loop4(i) \
{ t = rotr(t, 8); t = ls_box(t) ^ rco_tab[i]; \
t ^= E_KEY[4 * i]; E_KEY[4 * i + 4] = t; \
t ^= E_KEY[4 * i + 1]; E_KEY[4 * i + 5] = t; \
t ^= E_KEY[4 * i + 2]; E_KEY[4 * i + 6] = t; \
t ^= E_KEY[4 * i + 3]; E_KEY[4 * i + 7] = t; \
}

#define loop6(i) \
{ t = rotr(t, 8); t = ls_box(t) ^ rco_tab[i]; \
t ^= E_KEY[6 * i]; E_KEY[6 * i + 6] = t; \
t ^= E_KEY[6 * i + 1]; E_KEY[6 * i + 7] = t; \
t ^= E_KEY[6 * i + 2]; E_KEY[6 * i + 8] = t; \
t ^= E_KEY[6 * i + 3]; E_KEY[6 * i + 9] = t; \
t ^= E_KEY[6 * i + 4]; E_KEY[6 * i + 10] = t; \
t ^= E_KEY[6 * i + 5]; E_KEY[6 * i + 11] = t; \
}

#define loop8(i) \
{ t = rotr(t, 8); ; t = ls_box(t) ^ rco_tab[i]; \
t ^= E_KEY[8 * i]; E_KEY[8 * i + 8] = t; \
t ^= E_KEY[8 * i + 1]; E_KEY[8 * i + 9] = t; \
t ^= E_KEY[8 * i + 2]; E_KEY[8 * i + 10] = t; \
t ^= E_KEY[8 * i + 3]; E_KEY[8 * i + 11] = t; \
t = E_KEY[8 * i + 4] ^ ls_box(t); \
E_KEY[8 * i + 12] = t; \
t ^= E_KEY[8 * i + 5]; E_KEY[8 * i + 13] = t; \
t ^= E_KEY[8 * i + 6]; E_KEY[8 * i + 14] = t; \
t ^= E_KEY[8 * i + 7]; E_KEY[8 * i + 15] = t; \
}

/* Tells whether the ACE is capable to generate
the extended key for a given key_len. */
static inline int
Expand Down Expand Up @@ -321,28 +87,24 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
struct aes_ctx *ctx = aes_ctx(tfm);
const __le32 *key = (const __le32 *)in_key;
u32 *flags = &tfm->crt_flags;
uint32_t i, t, u, v, w;
uint32_t P[AES_EXTENDED_KEY_SIZE];
uint32_t rounds;
struct crypto_aes_ctx gen_aes;

if (key_len % 8) {
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}

ctx->key_length = key_len;

/*
* If the hardware is capable of generating the extended key
* itself we must supply the plain key for both encryption
* and decryption.
*/
ctx->D = ctx->E;

E_KEY[0] = le32_to_cpu(key[0]);
E_KEY[1] = le32_to_cpu(key[1]);
E_KEY[2] = le32_to_cpu(key[2]);
E_KEY[3] = le32_to_cpu(key[3]);
ctx->E[0] = le32_to_cpu(key[0]);
ctx->E[1] = le32_to_cpu(key[1]);
ctx->E[2] = le32_to_cpu(key[2]);
ctx->E[3] = le32_to_cpu(key[3]);

/* Prepare control words. */
memset(&ctx->cword, 0, sizeof(ctx->cword));
Expand All @@ -361,56 +123,13 @@ static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
ctx->cword.encrypt.keygen = 1;
ctx->cword.decrypt.keygen = 1;

switch (key_len) {
case 16:
t = E_KEY[3];
for (i = 0; i < 10; ++i)
loop4 (i);
break;

case 24:
E_KEY[4] = le32_to_cpu(key[4]);
t = E_KEY[5] = le32_to_cpu(key[5]);
for (i = 0; i < 8; ++i)
loop6 (i);
break;

case 32:
E_KEY[4] = le32_to_cpu(key[4]);
E_KEY[5] = le32_to_cpu(key[5]);
E_KEY[6] = le32_to_cpu(key[6]);
t = E_KEY[7] = le32_to_cpu(key[7]);
for (i = 0; i < 7; ++i)
loop8 (i);
break;
}

D_KEY[0] = E_KEY[0];
D_KEY[1] = E_KEY[1];
D_KEY[2] = E_KEY[2];
D_KEY[3] = E_KEY[3];

for (i = 4; i < key_len + 24; ++i) {
imix_col (D_KEY[i], E_KEY[i]);
}

/* PadLock needs a different format of the decryption key. */
rounds = 10 + (key_len - 16) / 4;

for (i = 0; i < rounds; i++) {
P[((i + 1) * 4) + 0] = D_KEY[((rounds - i - 1) * 4) + 0];
P[((i + 1) * 4) + 1] = D_KEY[((rounds - i - 1) * 4) + 1];
P[((i + 1) * 4) + 2] = D_KEY[((rounds - i - 1) * 4) + 2];
P[((i + 1) * 4) + 3] = D_KEY[((rounds - i - 1) * 4) + 3];
if (crypto_aes_expand_key(&gen_aes, in_key, key_len)) {
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}

P[0] = E_KEY[(rounds * 4) + 0];
P[1] = E_KEY[(rounds * 4) + 1];
P[2] = E_KEY[(rounds * 4) + 2];
P[3] = E_KEY[(rounds * 4) + 3];

memcpy(D_KEY, P, AES_EXTENDED_KEY_SIZE_B);

memcpy(ctx->E, gen_aes.key_enc, AES_MAX_KEYLENGTH);
memcpy(ctx->D, gen_aes.key_dec, AES_MAX_KEYLENGTH);
return 0;
}

Expand Down Expand Up @@ -675,7 +394,6 @@ static int __init padlock_init(void)
return -ENODEV;
}

gen_tabs();
if ((ret = crypto_register_alg(&aes_alg)))
goto aes_err;

Expand Down

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