|
|
@@ -1,284 +1,9 @@
|
|
|
/*
|
|
|
- * Cryptographic API.
|
|
|
+ * Glue Code for AES Cipher Algorithm
|
|
|
*
|
|
|
- * 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).
|
|
|
- * Andreas Steinmetz <ast@domdv.de> (adapted to x86_64 assembler)
|
|
|
- *
|
|
|
- * 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.
|
|
|
- * ---------------------------------------------------------------------------
|
|
|
*/
|
|
|
|
|
|
-/* Some changes from the Gladman version:
|
|
|
- s/RIJNDAEL(e_key)/E_KEY/g
|
|
|
- s/RIJNDAEL(d_key)/D_KEY/g
|
|
|
-*/
|
|
|
-
|
|
|
-#include <asm/byteorder.h>
|
|
|
#include <crypto/aes.h>
|
|
|
-#include <linux/bitops.h>
|
|
|
-#include <linux/crypto.h>
|
|
|
-#include <linux/errno.h>
|
|
|
-#include <linux/init.h>
|
|
|
-#include <linux/module.h>
|
|
|
-#include <linux/types.h>
|
|
|
-
|
|
|
-/*
|
|
|
- * #define byte(x, nr) ((unsigned char)((x) >> (nr*8)))
|
|
|
- */
|
|
|
-static inline u8 byte(const u32 x, const unsigned n)
|
|
|
-{
|
|
|
- return x >> (n << 3);
|
|
|
-}
|
|
|
-
|
|
|
-struct aes_ctx
|
|
|
-{
|
|
|
- u32 key_length;
|
|
|
- u32 buf[120];
|
|
|
-};
|
|
|
-
|
|
|
-#define E_KEY (&ctx->buf[0])
|
|
|
-#define D_KEY (&ctx->buf[60])
|
|
|
-
|
|
|
-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 aes_ft_tab[4][256];
|
|
|
-u32 aes_it_tab[4][256];
|
|
|
-
|
|
|
-u32 aes_fl_tab[4][256];
|
|
|
-u32 aes_il_tab[4][256];
|
|
|
-
|
|
|
-static inline u8 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)
|
|
|
-
|
|
|
-#define ls_box(x) \
|
|
|
- (aes_fl_tab[0][byte(x, 0)] ^ \
|
|
|
- aes_fl_tab[1][byte(x, 1)] ^ \
|
|
|
- aes_fl_tab[2][byte(x, 2)] ^ \
|
|
|
- aes_fl_tab[3][byte(x, 3)])
|
|
|
-
|
|
|
-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;
|
|
|
- aes_fl_tab[0][i] = t;
|
|
|
- aes_fl_tab[1][i] = rol32(t, 8);
|
|
|
- aes_fl_tab[2][i] = rol32(t, 16);
|
|
|
- aes_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);
|
|
|
-
|
|
|
- aes_ft_tab[0][i] = t;
|
|
|
- aes_ft_tab[1][i] = rol32(t, 8);
|
|
|
- aes_ft_tab[2][i] = rol32(t, 16);
|
|
|
- aes_ft_tab[3][i] = rol32(t, 24);
|
|
|
-
|
|
|
- p = isb_tab[i];
|
|
|
-
|
|
|
- t = p;
|
|
|
- aes_il_tab[0][i] = t;
|
|
|
- aes_il_tab[1][i] = rol32(t, 8);
|
|
|
- aes_il_tab[2][i] = rol32(t, 16);
|
|
|
- aes_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);
|
|
|
-
|
|
|
- aes_it_tab[0][i] = t;
|
|
|
- aes_it_tab[1][i] = rol32(t, 8);
|
|
|
- aes_it_tab[2][i] = rol32(t, 16);
|
|
|
- aes_it_tab[3][i] = rol32(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) ^= ror32(u ^ t, 8) ^ \
|
|
|
- ror32(v ^ t, 16) ^ \
|
|
|
- ror32(t, 24)
|
|
|
-
|
|
|
-/* initialise the key schedule from the user supplied key */
|
|
|
-
|
|
|
-#define loop4(i) \
|
|
|
-{ \
|
|
|
- t = ror32(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 = ror32(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 = ror32(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; \
|
|
|
-}
|
|
|
-
|
|
|
-static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
|
|
|
- unsigned int key_len)
|
|
|
-{
|
|
|
- struct aes_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
|
- const __le32 *key = (const __le32 *)in_key;
|
|
|
- u32 *flags = &tfm->crt_flags;
|
|
|
- u32 i, j, t, u, v, w;
|
|
|
-
|
|
|
- if (key_len % 8) {
|
|
|
- *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
|
|
|
- return -EINVAL;
|
|
|
- }
|
|
|
-
|
|
|
- ctx->key_length = key_len;
|
|
|
-
|
|
|
- D_KEY[key_len + 24] = E_KEY[0] = le32_to_cpu(key[0]);
|
|
|
- D_KEY[key_len + 25] = E_KEY[1] = le32_to_cpu(key[1]);
|
|
|
- D_KEY[key_len + 26] = E_KEY[2] = le32_to_cpu(key[2]);
|
|
|
- D_KEY[key_len + 27] = E_KEY[3] = le32_to_cpu(key[3]);
|
|
|
-
|
|
|
- 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[key_len + 24];
|
|
|
- D_KEY[1] = E_KEY[key_len + 25];
|
|
|
- D_KEY[2] = E_KEY[key_len + 26];
|
|
|
- D_KEY[3] = E_KEY[key_len + 27];
|
|
|
-
|
|
|
- for (i = 4; i < key_len + 24; ++i) {
|
|
|
- j = key_len + 24 - (i & ~3) + (i & 3);
|
|
|
- imix_col(D_KEY[j], E_KEY[i]);
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
|
|
|
asmlinkage void aes_enc_blk(struct crypto_tfm *tfm, u8 *out, const u8 *in);
|
|
|
asmlinkage void aes_dec_blk(struct crypto_tfm *tfm, u8 *out, const u8 *in);
|
|
|
@@ -299,14 +24,14 @@ static struct crypto_alg aes_alg = {
|
|
|
.cra_priority = 200,
|
|
|
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
|
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
|
- .cra_ctxsize = sizeof(struct aes_ctx),
|
|
|
+ .cra_ctxsize = sizeof(struct crypto_aes_ctx),
|
|
|
.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 = aes_set_key,
|
|
|
+ .cia_setkey = crypto_aes_set_key,
|
|
|
.cia_encrypt = aes_encrypt,
|
|
|
.cia_decrypt = aes_decrypt
|
|
|
}
|
|
|
@@ -315,7 +40,6 @@ static struct crypto_alg aes_alg = {
|
|
|
|
|
|
static int __init aes_init(void)
|
|
|
{
|
|
|
- gen_tabs();
|
|
|
return crypto_register_alg(&aes_alg);
|
|
|
}
|
|
|
|
Sebastian Siewior