Revision 98873f53becea9a8a46972ff252e96fe575b120d authored by Ralf Baechle on 09 December 2008, 17:58:46 UTC, committed by Ralf Baechle on 09 December 2008, 21:55:43 UTC
Certain X11 servers such as the SIS server will only work if PCI mmap is implemented. This patch implements PCI mmap but to be on the same side so close to a release it only supports uncached mappings so performance will not be optimal for some uses such as framebuffers. Thanks to Zhang Le <r0bertz@gentoo.org> for the original report and testing. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent bbeba4c
aes_generic.c
/*
* Cryptographic API.
*
* AES Cipher Algorithm.
*
* Based on Brian Gladman's code.
*
* Linux developers:
* Alexander Kjeldaas <astor@fast.no>
* Herbert Valerio Riedel <hvr@hvrlab.org>
* Kyle McMartin <kyle@debian.org>
* Adam J. Richter <adam@yggdrasil.com> (conversion to 2.5 API).
*
* 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/aes.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/crypto.h>
#include <asm/byteorder.h>
static inline u8 byte(const u32 x, const unsigned n)
{
return x >> (n << 3);
}
static u8 pow_tab[256] __initdata;
static u8 log_tab[256] __initdata;
static u8 sbx_tab[256] __initdata;
static u8 isb_tab[256] __initdata;
static u32 rco_tab[10];
u32 crypto_ft_tab[4][256];
u32 crypto_fl_tab[4][256];
u32 crypto_it_tab[4][256];
u32 crypto_il_tab[4][256];
EXPORT_SYMBOL_GPL(crypto_ft_tab);
EXPORT_SYMBOL_GPL(crypto_fl_tab);
EXPORT_SYMBOL_GPL(crypto_it_tab);
EXPORT_SYMBOL_GPL(crypto_il_tab);
static inline u8 __init f_mult(u8 a, u8 b)
{
u8 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)
static void __init gen_tabs(void)
{
u32 i, t;
u8 p, q;
/*
* log and power tables for GF(2**8) finite field with
* 0x011b as modular polynomial - the simplest primitive
* root is 0x03, used here to generate the tables
*/
for (i = 0, p = 1; i < 256; ++i) {
pow_tab[i] = (u8) p;
log_tab[p] = (u8) 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] = (u8) i;
}
for (i = 0; i < 256; ++i) {
p = sbx_tab[i];
t = p;
crypto_fl_tab[0][i] = t;
crypto_fl_tab[1][i] = rol32(t, 8);
crypto_fl_tab[2][i] = rol32(t, 16);
crypto_fl_tab[3][i] = rol32(t, 24);
t = ((u32) ff_mult(2, p)) |
((u32) p << 8) |
((u32) p << 16) | ((u32) ff_mult(3, p) << 24);
crypto_ft_tab[0][i] = t;
crypto_ft_tab[1][i] = rol32(t, 8);
crypto_ft_tab[2][i] = rol32(t, 16);
crypto_ft_tab[3][i] = rol32(t, 24);
p = isb_tab[i];
t = p;
crypto_il_tab[0][i] = t;
crypto_il_tab[1][i] = rol32(t, 8);
crypto_il_tab[2][i] = rol32(t, 16);
crypto_il_tab[3][i] = rol32(t, 24);
t = ((u32) ff_mult(14, p)) |
((u32) ff_mult(9, p) << 8) |
((u32) ff_mult(13, p) << 16) |
((u32) ff_mult(11, p) << 24);
crypto_it_tab[0][i] = t;
crypto_it_tab[1][i] = rol32(t, 8);
crypto_it_tab[2][i] = rol32(t, 16);
crypto_it_tab[3][i] = rol32(t, 24);
}
}
/* initialise the key schedule from the user supplied key */
#define star_x(x) (((x) & 0x7f7f7f7f) << 1) ^ ((((x) & 0x80808080) >> 7) * 0x1b)
#define imix_col(y,x) do { \
u = star_x(x); \
v = star_x(u); \
w = star_x(v); \
t = w ^ (x); \
(y) = u ^ v ^ w; \
(y) ^= ror32(u ^ t, 8) ^ \
ror32(v ^ t, 16) ^ \
ror32(t, 24); \
} while (0)
#define ls_box(x) \
crypto_fl_tab[0][byte(x, 0)] ^ \
crypto_fl_tab[1][byte(x, 1)] ^ \
crypto_fl_tab[2][byte(x, 2)] ^ \
crypto_fl_tab[3][byte(x, 3)]
#define loop4(i) do { \
t = ror32(t, 8); \
t = ls_box(t) ^ rco_tab[i]; \
t ^= ctx->key_enc[4 * i]; \
ctx->key_enc[4 * i + 4] = t; \
t ^= ctx->key_enc[4 * i + 1]; \
ctx->key_enc[4 * i + 5] = t; \
t ^= ctx->key_enc[4 * i + 2]; \
ctx->key_enc[4 * i + 6] = t; \
t ^= ctx->key_enc[4 * i + 3]; \
ctx->key_enc[4 * i + 7] = t; \
} while (0)
#define loop6(i) do { \
t = ror32(t, 8); \
t = ls_box(t) ^ rco_tab[i]; \
t ^= ctx->key_enc[6 * i]; \
ctx->key_enc[6 * i + 6] = t; \
t ^= ctx->key_enc[6 * i + 1]; \
ctx->key_enc[6 * i + 7] = t; \
t ^= ctx->key_enc[6 * i + 2]; \
ctx->key_enc[6 * i + 8] = t; \
t ^= ctx->key_enc[6 * i + 3]; \
ctx->key_enc[6 * i + 9] = t; \
t ^= ctx->key_enc[6 * i + 4]; \
ctx->key_enc[6 * i + 10] = t; \
t ^= ctx->key_enc[6 * i + 5]; \
ctx->key_enc[6 * i + 11] = t; \
} while (0)
#define loop8(i) do { \
t = ror32(t, 8); \
t = ls_box(t) ^ rco_tab[i]; \
t ^= ctx->key_enc[8 * i]; \
ctx->key_enc[8 * i + 8] = t; \
t ^= ctx->key_enc[8 * i + 1]; \
ctx->key_enc[8 * i + 9] = t; \
t ^= ctx->key_enc[8 * i + 2]; \
ctx->key_enc[8 * i + 10] = t; \
t ^= ctx->key_enc[8 * i + 3]; \
ctx->key_enc[8 * i + 11] = t; \
t = ctx->key_enc[8 * i + 4] ^ ls_box(t); \
ctx->key_enc[8 * i + 12] = t; \
t ^= ctx->key_enc[8 * i + 5]; \
ctx->key_enc[8 * i + 13] = t; \
t ^= ctx->key_enc[8 * i + 6]; \
ctx->key_enc[8 * i + 14] = t; \
t ^= ctx->key_enc[8 * i + 7]; \
ctx->key_enc[8 * i + 15] = t; \
} while (0)
/**
* crypto_aes_expand_key - Expands the AES key as described in FIPS-197
* @ctx: The location where the computed key will be stored.
* @in_key: The supplied key.
* @key_len: The length of the supplied key.
*
* Returns 0 on success. The function fails only if an invalid key size (or
* pointer) is supplied.
* The expanded key size is 240 bytes (max of 14 rounds with a unique 16 bytes
* key schedule plus a 16 bytes key which is used before the first round).
* The decryption key is prepared for the "Equivalent Inverse Cipher" as
* described in FIPS-197. The first slot (16 bytes) of each key (enc or dec) is
* for the initial combination, the second slot for the first round and so on.
*/
int crypto_aes_expand_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
unsigned int key_len)
{
const __le32 *key = (const __le32 *)in_key;
u32 i, t, u, v, w, j;
if (key_len != AES_KEYSIZE_128 && key_len != AES_KEYSIZE_192 &&
key_len != AES_KEYSIZE_256)
return -EINVAL;
ctx->key_length = key_len;
ctx->key_dec[key_len + 24] = ctx->key_enc[0] = le32_to_cpu(key[0]);
ctx->key_dec[key_len + 25] = ctx->key_enc[1] = le32_to_cpu(key[1]);
ctx->key_dec[key_len + 26] = ctx->key_enc[2] = le32_to_cpu(key[2]);
ctx->key_dec[key_len + 27] = ctx->key_enc[3] = le32_to_cpu(key[3]);
switch (key_len) {
case AES_KEYSIZE_128:
t = ctx->key_enc[3];
for (i = 0; i < 10; ++i)
loop4(i);
break;
case AES_KEYSIZE_192:
ctx->key_enc[4] = le32_to_cpu(key[4]);
t = ctx->key_enc[5] = le32_to_cpu(key[5]);
for (i = 0; i < 8; ++i)
loop6(i);
break;
case AES_KEYSIZE_256:
ctx->key_enc[4] = le32_to_cpu(key[4]);
ctx->key_enc[5] = le32_to_cpu(key[5]);
ctx->key_enc[6] = le32_to_cpu(key[6]);
t = ctx->key_enc[7] = le32_to_cpu(key[7]);
for (i = 0; i < 7; ++i)
loop8(i);
break;
}
ctx->key_dec[0] = ctx->key_enc[key_len + 24];
ctx->key_dec[1] = ctx->key_enc[key_len + 25];
ctx->key_dec[2] = ctx->key_enc[key_len + 26];
ctx->key_dec[3] = ctx->key_enc[key_len + 27];
for (i = 4; i < key_len + 24; ++i) {
j = key_len + 24 - (i & ~3) + (i & 3);
imix_col(ctx->key_dec[j], ctx->key_enc[i]);
}
return 0;
}
EXPORT_SYMBOL_GPL(crypto_aes_expand_key);
/**
* crypto_aes_set_key - Set the AES key.
* @tfm: The %crypto_tfm that is used in the context.
* @in_key: The input key.
* @key_len: The size of the key.
*
* Returns 0 on success, on failure the %CRYPTO_TFM_RES_BAD_KEY_LEN flag in tfm
* is set. The function uses crypto_aes_expand_key() to expand the key.
* &crypto_aes_ctx _must_ be the private data embedded in @tfm which is
* retrieved with crypto_tfm_ctx().
*/
int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
unsigned int key_len)
{
struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
u32 *flags = &tfm->crt_flags;
int ret;
ret = crypto_aes_expand_key(ctx, in_key, key_len);
if (!ret)
return 0;
*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
return -EINVAL;
}
EXPORT_SYMBOL_GPL(crypto_aes_set_key);
/* encrypt a block of text */
#define f_rn(bo, bi, n, k) do { \
bo[n] = crypto_ft_tab[0][byte(bi[n], 0)] ^ \
crypto_ft_tab[1][byte(bi[(n + 1) & 3], 1)] ^ \
crypto_ft_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \
crypto_ft_tab[3][byte(bi[(n + 3) & 3], 3)] ^ *(k + n); \
} while (0)
#define f_nround(bo, bi, k) do {\
f_rn(bo, bi, 0, k); \
f_rn(bo, bi, 1, k); \
f_rn(bo, bi, 2, k); \
f_rn(bo, bi, 3, k); \
k += 4; \
} while (0)
#define f_rl(bo, bi, n, k) do { \
bo[n] = crypto_fl_tab[0][byte(bi[n], 0)] ^ \
crypto_fl_tab[1][byte(bi[(n + 1) & 3], 1)] ^ \
crypto_fl_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \
crypto_fl_tab[3][byte(bi[(n + 3) & 3], 3)] ^ *(k + n); \
} while (0)
#define f_lround(bo, bi, k) do {\
f_rl(bo, bi, 0, k); \
f_rl(bo, bi, 1, k); \
f_rl(bo, bi, 2, k); \
f_rl(bo, bi, 3, k); \
} while (0)
static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *src = (const __le32 *)in;
__le32 *dst = (__le32 *)out;
u32 b0[4], b1[4];
const u32 *kp = ctx->key_enc + 4;
const int key_len = ctx->key_length;
b0[0] = le32_to_cpu(src[0]) ^ ctx->key_enc[0];
b0[1] = le32_to_cpu(src[1]) ^ ctx->key_enc[1];
b0[2] = le32_to_cpu(src[2]) ^ ctx->key_enc[2];
b0[3] = le32_to_cpu(src[3]) ^ ctx->key_enc[3];
if (key_len > 24) {
f_nround(b1, b0, kp);
f_nround(b0, b1, kp);
}
if (key_len > 16) {
f_nround(b1, b0, kp);
f_nround(b0, b1, kp);
}
f_nround(b1, b0, kp);
f_nround(b0, b1, kp);
f_nround(b1, b0, kp);
f_nround(b0, b1, kp);
f_nround(b1, b0, kp);
f_nround(b0, b1, kp);
f_nround(b1, b0, kp);
f_nround(b0, b1, kp);
f_nround(b1, b0, kp);
f_lround(b0, b1, kp);
dst[0] = cpu_to_le32(b0[0]);
dst[1] = cpu_to_le32(b0[1]);
dst[2] = cpu_to_le32(b0[2]);
dst[3] = cpu_to_le32(b0[3]);
}
/* decrypt a block of text */
#define i_rn(bo, bi, n, k) do { \
bo[n] = crypto_it_tab[0][byte(bi[n], 0)] ^ \
crypto_it_tab[1][byte(bi[(n + 3) & 3], 1)] ^ \
crypto_it_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \
crypto_it_tab[3][byte(bi[(n + 1) & 3], 3)] ^ *(k + n); \
} while (0)
#define i_nround(bo, bi, k) do {\
i_rn(bo, bi, 0, k); \
i_rn(bo, bi, 1, k); \
i_rn(bo, bi, 2, k); \
i_rn(bo, bi, 3, k); \
k += 4; \
} while (0)
#define i_rl(bo, bi, n, k) do { \
bo[n] = crypto_il_tab[0][byte(bi[n], 0)] ^ \
crypto_il_tab[1][byte(bi[(n + 3) & 3], 1)] ^ \
crypto_il_tab[2][byte(bi[(n + 2) & 3], 2)] ^ \
crypto_il_tab[3][byte(bi[(n + 1) & 3], 3)] ^ *(k + n); \
} while (0)
#define i_lround(bo, bi, k) do {\
i_rl(bo, bi, 0, k); \
i_rl(bo, bi, 1, k); \
i_rl(bo, bi, 2, k); \
i_rl(bo, bi, 3, k); \
} while (0)
static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
{
const struct crypto_aes_ctx *ctx = crypto_tfm_ctx(tfm);
const __le32 *src = (const __le32 *)in;
__le32 *dst = (__le32 *)out;
u32 b0[4], b1[4];
const int key_len = ctx->key_length;
const u32 *kp = ctx->key_dec + 4;
b0[0] = le32_to_cpu(src[0]) ^ ctx->key_dec[0];
b0[1] = le32_to_cpu(src[1]) ^ ctx->key_dec[1];
b0[2] = le32_to_cpu(src[2]) ^ ctx->key_dec[2];
b0[3] = le32_to_cpu(src[3]) ^ ctx->key_dec[3];
if (key_len > 24) {
i_nround(b1, b0, kp);
i_nround(b0, b1, kp);
}
if (key_len > 16) {
i_nround(b1, b0, kp);
i_nround(b0, b1, kp);
}
i_nround(b1, b0, kp);
i_nround(b0, b1, kp);
i_nround(b1, b0, kp);
i_nround(b0, b1, kp);
i_nround(b1, b0, kp);
i_nround(b0, b1, kp);
i_nround(b1, b0, kp);
i_nround(b0, b1, kp);
i_nround(b1, b0, kp);
i_lround(b0, b1, kp);
dst[0] = cpu_to_le32(b0[0]);
dst[1] = cpu_to_le32(b0[1]);
dst[2] = cpu_to_le32(b0[2]);
dst[3] = cpu_to_le32(b0[3]);
}
static struct crypto_alg aes_alg = {
.cra_name = "aes",
.cra_driver_name = "aes-generic",
.cra_priority = 100,
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize = AES_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct crypto_aes_ctx),
.cra_alignmask = 3,
.cra_module = THIS_MODULE,
.cra_list = LIST_HEAD_INIT(aes_alg.cra_list),
.cra_u = {
.cipher = {
.cia_min_keysize = AES_MIN_KEY_SIZE,
.cia_max_keysize = AES_MAX_KEY_SIZE,
.cia_setkey = crypto_aes_set_key,
.cia_encrypt = aes_encrypt,
.cia_decrypt = aes_decrypt
}
}
};
static int __init aes_init(void)
{
gen_tabs();
return crypto_register_alg(&aes_alg);
}
static void __exit aes_fini(void)
{
crypto_unregister_alg(&aes_alg);
}
module_init(aes_init);
module_exit(aes_fini);
MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_ALIAS("aes");
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