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|
/* Optimized implementation of the Serpent AES candidate algorithm
* Designed by Anderson, Biham and Knudsen and Implemented by
* Gisle Slensminde 2000.
*
* The implementation is based on the pentium optimised sboxes of
* Dag Arne Osvik. Even these sboxes are designed to be optimal for x86
* processors they are efficient on other processors as well, but the speedup
* isn't so impressive compared to other implementations.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public License
* as published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* Adapted to normal loop device transfer interface.
* Jari Ruusu, March 5 2002
*
* Fixed endianness bug.
* Jari Ruusu, December 26 2002
*
* Added support for MD5 IV computation and multi-key operation.
* Jari Ruusu, October 22 2003
*/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/slab.h>
#if LINUX_VERSION_CODE >= 0x20600
# include <linux/bio.h>
# include <linux/blkdev.h>
#endif
#include <linux/loop.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>
#define rotl(reg, val) ((reg << val) | (reg >> (32 - val)))
#define rotr(reg, val) ((reg >> val) | (reg << (32 - val)))
#define io_swap_be(x) __cpu_to_be32(x) /* incorrect byte order */
#define io_swap_le(x) __cpu_to_le32(x) /* correct byte order */
/* The sbox functions. The first four parameters is the input bits, and
* the last is a tempoary. These parameters are also used for output, but
* the bit order is permuted. The output bit order from S0 is
* (1 4 2 0 3), where 3 is the (now useless) tempoary.
*/
#define S0(r0,r1,r2,r3,r4) \
r3 = r3 ^ r0; \
r4 = r1; \
r1 = r1 & r3; \
r4 = r4 ^ r2; \
r1 = r1 ^ r0; \
r0 = r0 | r3; \
r0 = r0 ^ r4; \
r4 = r4 ^ r3; \
r3 = r3 ^ r2; \
r2 = r2 | r1; \
r2 = r2 ^ r4; \
r4 = -1 ^ r4; \
r4 = r4 | r1; \
r1 = r1 ^ r3; \
r1 = r1 ^ r4; \
r3 = r3 | r0; \
r1 = r1 ^ r3; \
r4 = r4 ^ r3;
#define S1(r0,r1,r2,r3,r4) \
r1 = -1 ^ r1; \
r4 = r0; \
r0 = r0 ^ r1; \
r4 = r4 | r1; \
r4 = r4 ^ r3; \
r3 = r3 & r0; \
r2 = r2 ^ r4; \
r3 = r3 ^ r1; \
r3 = r3 | r2; \
r0 = r0 ^ r4; \
r3 = r3 ^ r0; \
r1 = r1 & r2; \
r0 = r0 | r1; \
r1 = r1 ^ r4; \
r0 = r0 ^ r2; \
r4 = r4 | r3; \
r0 = r0 ^ r4; \
r4 = -1 ^ r4; \
r1 = r1 ^ r3; \
r4 = r4 & r2; \
r1 = -1 ^ r1; \
r4 = r4 ^ r0; \
r1 = r1 ^ r4;
#define S2(r0,r1,r2,r3,r4) \
r4 = r0; \
r0 = r0 & r2; \
r0 = r0 ^ r3; \
r2 = r2 ^ r1; \
r2 = r2 ^ r0; \
r3 = r3 | r4; \
r3 = r3 ^ r1; \
r4 = r4 ^ r2; \
r1 = r3; \
r3 = r3 | r4; \
r3 = r3 ^ r0; \
r0 = r0 & r1; \
r4 = r4 ^ r0; \
r1 = r1 ^ r3; \
r1 = r1 ^ r4; \
r4 = -1 ^ r4;
#define S3(r0,r1,r2,r3,r4) \
r4 = r0 ; \
r0 = r0 | r3; \
r3 = r3 ^ r1; \
r1 = r1 & r4; \
r4 = r4 ^ r2; \
r2 = r2 ^ r3; \
r3 = r3 & r0; \
r4 = r4 | r1; \
r3 = r3 ^ r4; \
r0 = r0 ^ r1; \
r4 = r4 & r0; \
r1 = r1 ^ r3; \
r4 = r4 ^ r2; \
r1 = r1 | r0; \
r1 = r1 ^ r2; \
r0 = r0 ^ r3; \
r2 = r1; \
r1 = r1 | r3; \
r1 = r1 ^ r0;
#define S4(r0,r1,r2,r3,r4) \
r1 = r1 ^ r3; \
r3 = -1 ^ r3; \
r2 = r2 ^ r3; \
r3 = r3 ^ r0; \
r4 = r1; \
r1 = r1 & r3; \
r1 = r1 ^ r2; \
r4 = r4 ^ r3; \
r0 = r0 ^ r4; \
r2 = r2 & r4; \
r2 = r2 ^ r0; \
r0 = r0 & r1; \
r3 = r3 ^ r0; \
r4 = r4 | r1; \
r4 = r4 ^ r0; \
r0 = r0 | r3; \
r0 = r0 ^ r2; \
r2 = r2 & r3; \
r0 = -1 ^ r0; \
r4 = r4 ^ r2;
#define S5(r0,r1,r2,r3,r4) \
r0 = r0 ^ r1; \
r1 = r1 ^ r3; \
r3 = -1 ^ r3; \
r4 = r1; \
r1 = r1 & r0; \
r2 = r2 ^ r3; \
r1 = r1 ^ r2; \
r2 = r2 | r4; \
r4 = r4 ^ r3; \
r3 = r3 & r1; \
r3 = r3 ^ r0; \
r4 = r4 ^ r1; \
r4 = r4 ^ r2; \
r2 = r2 ^ r0; \
r0 = r0 & r3; \
r2 = -1 ^ r2; \
r0 = r0 ^ r4; \
r4 = r4 | r3; \
r2 = r2 ^ r4;
#define S6(r0,r1,r2,r3,r4) \
r2 = -1 ^ r2; \
r4 = r3; \
r3 = r3 & r0; \
r0 = r0 ^ r4; \
r3 = r3 ^ r2; \
r2 = r2 | r4; \
r1 = r1 ^ r3; \
r2 = r2 ^ r0; \
r0 = r0 | r1; \
r2 = r2 ^ r1; \
r4 = r4 ^ r0; \
r0 = r0 | r3; \
r0 = r0 ^ r2; \
r4 = r4 ^ r3; \
r4 = r4 ^ r0; \
r3 = -1 ^ r3; \
r2 = r2 & r4; \
r2 = r2 ^ r3;
#define S7(r0,r1,r2,r3,r4) \
r4 = r2; \
r2 = r2 & r1; \
r2 = r2 ^ r3; \
r3 = r3 & r1; \
r4 = r4 ^ r2; \
r2 = r2 ^ r1; \
r1 = r1 ^ r0; \
r0 = r0 | r4; \
r0 = r0 ^ r2; \
r3 = r3 ^ r1; \
r2 = r2 ^ r3; \
r3 = r3 & r0; \
r3 = r3 ^ r4; \
r4 = r4 ^ r2; \
r2 = r2 & r0; \
r4 = -1 ^ r4; \
r2 = r2 ^ r4; \
r4 = r4 & r0; \
r1 = r1 ^ r3; \
r4 = r4 ^ r1;
/* The inverse sboxes */
#define I0(r0,r1,r2,r3,r4) \
r2 = r2 ^ -1; \
r4 = r1; \
r1 = r1 | r0; \
r4 = r4 ^ -1; \
r1 = r1 ^ r2; \
r2 = r2 | r4; \
r1 = r1 ^ r3; \
r0 = r0 ^ r4; \
r2 = r2 ^ r0; \
r0 = r0 & r3; \
r4 = r4 ^ r0; \
r0 = r0 | r1; \
r0 = r0 ^ r2; \
r3 = r3 ^ r4; \
r2 = r2 ^ r1; \
r3 = r3 ^ r0; \
r3 = r3 ^ r1; \
r2 = r2 & r3; \
r4 = r4 ^ r2;
#define I1(r0,r1,r2,r3,r4) \
r4 = r1; \
r1 = r1 ^ r3; \
r3 = r3 & r1; \
r4 = r4 ^ r2; \
r3 = r3 ^ r0; \
r0 = r0 | r1; \
r2 = r2 ^ r3; \
r0 = r0 ^ r4; \
r0 = r0 | r2; \
r1 = r1 ^ r3; \
r0 = r0 ^ r1; \
r1 = r1 | r3; \
r1 = r1 ^ r0; \
r4 = r4 ^ -1; \
r4 = r4 ^ r1; \
r1 = r1 | r0; \
r1 = r1 ^ r0; \
r1 = r1 | r4; \
r3 = r3 ^ r1;
#define I2(r0,r1,r2,r3,r4) \
r2 = r2 ^ r3; \
r3 = r3 ^ r0; \
r4 = r3; \
r3 = r3 & r2; \
r3 = r3 ^ r1; \
r1 = r1 | r2; \
r1 = r1 ^ r4; \
r4 = r4 & r3; \
r2 = r2 ^ r3; \
r4 = r4 & r0; \
r4 = r4 ^ r2; \
r2 = r2 & r1; \
r2 = r2 | r0; \
r3 = r3 ^ -1; \
r2 = r2 ^ r3; \
r0 = r0 ^ r3; \
r0 = r0 & r1; \
r3 = r3 ^ r4; \
r3 = r3 ^ r0;
#define I3(r0,r1,r2,r3,r4) \
r4 = r2; \
r2 = r2 ^ r1; \
r0 = r0 ^ r2; \
r4 = r4 & r2; \
r4 = r4 ^ r0; \
r0 = r0 & r1; \
r1 = r1 ^ r3; \
r3 = r3 | r4; \
r2 = r2 ^ r3; \
r0 = r0 ^ r3; \
r1 = r1 ^ r4; \
r3 = r3 & r2; \
r3 = r3 ^ r1; \
r1 = r1 ^ r0; \
r1 = r1 | r2; \
r0 = r0 ^ r3; \
r1 = r1 ^ r4; \
r0 = r0 ^ r1;
#define I4(r0,r1,r2,r3,r4) \
r4 = r2; \
r2 = r2 & r3; \
r2 = r2 ^ r1; \
r1 = r1 | r3; \
r1 = r1 & r0; \
r4 = r4 ^ r2; \
r4 = r4 ^ r1; \
r1 = r1 & r2; \
r0 = r0 ^ -1; \
r3 = r3 ^ r4; \
r1 = r1 ^ r3; \
r3 = r3 & r0; \
r3 = r3 ^ r2; \
r0 = r0 ^ r1; \
r2 = r2 & r0; \
r3 = r3 ^ r0; \
r2 = r2 ^ r4; \
r2 = r2 | r3; \
r3 = r3 ^ r0; \
r2 = r2 ^ r1;
#define I5(r0,r1,r2,r3,r4) \
r1 = r1 ^ -1; \
r4 = r3; \
r2 = r2 ^ r1; \
r3 = r3 | r0; \
r3 = r3 ^ r2; \
r2 = r2 | r1; \
r2 = r2 & r0; \
r4 = r4 ^ r3; \
r2 = r2 ^ r4; \
r4 = r4 | r0; \
r4 = r4 ^ r1; \
r1 = r1 & r2; \
r1 = r1 ^ r3; \
r4 = r4 ^ r2; \
r3 = r3 & r4; \
r4 = r4 ^ r1; \
r3 = r3 ^ r0; \
r3 = r3 ^ r4; \
r4 = r4 ^ -1;
#define I6(r0,r1,r2,r3,r4) \
r0 = r0 ^ r2; \
r4 = r2; \
r2 = r2 & r0; \
r4 = r4 ^ r3; \
r2 = r2 ^ -1; \
r3 = r3 ^ r1; \
r2 = r2 ^ r3; \
r4 = r4 | r0; \
r0 = r0 ^ r2; \
r3 = r3 ^ r4; \
r4 = r4 ^ r1; \
r1 = r1 & r3; \
r1 = r1 ^ r0; \
r0 = r0 ^ r3; \
r0 = r0 | r2; \
r3 = r3 ^ r1; \
r4 = r4 ^ r0;
#define I7(r0,r1,r2,r3,r4) \
r4 = r2; \
r2 = r2 ^ r0; \
r0 = r0 & r3; \
r4 = r4 | r3; \
r2 = r2 ^ -1; \
r3 = r3 ^ r1; \
r1 = r1 | r0; \
r0 = r0 ^ r2; \
r2 = r2 & r4; \
r3 = r3 & r4; \
r1 = r1 ^ r2; \
r2 = r2 ^ r0; \
r0 = r0 | r2; \
r4 = r4 ^ r1; \
r0 = r0 ^ r3; \
r3 = r3 ^ r4; \
r4 = r4 | r0; \
r3 = r3 ^ r2; \
r4 = r4 ^ r2;
/* forward and inverse linear transformations */
#define LINTRANS(r0,r1,r2,r3,r4) \
r0 = rotl(r0, 13); \
r2 = rotl(r2, 3); \
r3 = r3 ^ r2; \
r4 = r0 << 3; \
r1 = r1 ^ r0; \
r3 = r3 ^ r4; \
r1 = r1 ^ r2; \
r3 = rotl(r3, 7); \
r1 = rotl(r1, 1); \
r2 = r2 ^ r3; \
r4 = r1 << 7; \
r0 = r0 ^ r1; \
r2 = r2 ^ r4; \
r0 = r0 ^ r3; \
r2 = rotl(r2, 22); \
r0 = rotl(r0, 5);
#define ILINTRANS(r0,r1,r2,r3,r4) \
r2 = rotr(r2, 22); \
r0 = rotr(r0, 5); \
r2 = r2 ^ r3; \
r4 = r1 << 7; \
r0 = r0 ^ r1; \
r2 = r2 ^ r4; \
r0 = r0 ^ r3; \
r3 = rotr(r3, 7); \
r1 = rotr(r1, 1); \
r3 = r3 ^ r2; \
r4 = r0 << 3; \
r1 = r1 ^ r0; \
r3 = r3 ^ r4; \
r1 = r1 ^ r2; \
r2 = rotr(r2, 3); \
r0 = rotr(r0, 13);
#define KEYMIX(r0,r1,r2,r3,r4,IN) \
r0 = r0 ^ l_key[IN+8]; \
r1 = r1 ^ l_key[IN+9]; \
r2 = r2 ^ l_key[IN+10]; \
r3 = r3 ^ l_key[IN+11];
#define GETKEY(r0, r1, r2, r3, IN) \
r0 = l_key[IN+8]; \
r1 = l_key[IN+9]; \
r2 = l_key[IN+10]; \
r3 = l_key[IN+11];
#define SETKEY(r0, r1, r2, r3, IN) \
l_key[IN+8] = r0; \
l_key[IN+9] = r1; \
l_key[IN+10] = r2; \
l_key[IN+11] = r3;
/* initialise the key schedule from the user supplied key */
static void serpent_set_key(u32 *l_key, unsigned char *key, int key_len, int wrongByteOrder)
{
u32 *in_key = (u32 *)key;
u32 i,lk,r0,r1,r2,r3,r4;
if (key_len != 16 && key_len != 24 && key_len != 32)
key_len = 16;
key_len *= 8;
i = 0; lk = (key_len + 31) / 32;
while(i < lk)
{
if (wrongByteOrder) {
/* incorrect byte order */
l_key[i] = io_swap_be(in_key[lk - i - 1]);
} else {
/* correct byte order */
l_key[i] = io_swap_le(in_key[i]);
}
i++;
}
if (key_len < 256)
{
while(i < 8)
l_key[i++] = 0;
i = key_len / 32; lk = 1 << key_len % 32;
l_key[i] &= lk - 1;
l_key[i] |= lk;
}
for(i = 0; i < 132; ++i)
{
lk = l_key[i] ^ l_key[i + 3] ^ l_key[i + 5]
^ l_key[i + 7] ^ 0x9e3779b9 ^ i;
l_key[i + 8] = (lk << 11) | (lk >> 21);
}
GETKEY(r0, r1, r2, r3, 0);
S3(r0,r1,r2,r3,r4);
SETKEY(r1, r2, r3, r4, 0)
GETKEY(r0, r1, r2, r3, 4);
S2(r0,r1,r2,r3,r4);
SETKEY(r2, r3, r1, r4, 4)
GETKEY(r0, r1, r2, r3, 8);
S1(r0,r1,r2,r3,r4);
SETKEY(r3, r1, r2, r0, 8)
GETKEY(r0, r1, r2, r3, 12);
S0(r0,r1,r2,r3,r4);
SETKEY(r1, r4, r2, r0, 12)
GETKEY(r0, r1, r2, r3, 16);
S7(r0,r1,r2,r3,r4);
SETKEY(r2, r4, r3, r0, 16)
GETKEY(r0, r1, r2, r3, 20);
S6(r0,r1,r2,r3,r4)
SETKEY(r0, r1, r4, r2, 20)
GETKEY(r0, r1, r2, r3, 24);
S5(r0,r1,r2,r3,r4);
SETKEY(r1, r3, r0, r2, 24)
GETKEY(r0, r1, r2, r3, 28);
S4(r0,r1,r2,r3,r4)
SETKEY(r1, r4, r0, r3, 28)
GETKEY(r0, r1, r2, r3, 32);
S3(r0,r1,r2,r3,r4);
SETKEY(r1, r2, r3, r4, 32)
GETKEY(r0, r1, r2, r3, 36);
S2(r0,r1,r2,r3,r4);
SETKEY(r2, r3, r1, r4, 36)
GETKEY(r0, r1, r2, r3, 40);
S1(r0,r1,r2,r3,r4);
SETKEY(r3, r1, r2, r0, 40)
GETKEY(r0, r1, r2, r3, 44);
S0(r0,r1,r2,r3,r4);
SETKEY(r1, r4, r2, r0, 44)
GETKEY(r0, r1, r2, r3, 48);
S7(r0,r1,r2,r3,r4);
SETKEY(r2, r4, r3, r0, 48)
GETKEY(r0, r1, r2, r3, 52);
S6(r0,r1,r2,r3,r4)
SETKEY(r0, r1, r4, r2, 52)
GETKEY(r0, r1, r2, r3, 56);
S5(r0,r1,r2,r3,r4);
SETKEY(r1, r3, r0, r2, 56)
GETKEY(r0, r1, r2, r3, 60);
S4(r0,r1,r2,r3,r4)
SETKEY(r1, r4, r0, r3, 60)
GETKEY(r0, r1, r2, r3, 64);
S3(r0,r1,r2,r3,r4);
SETKEY(r1, r2, r3, r4, 64)
GETKEY(r0, r1, r2, r3, 68);
S2(r0,r1,r2,r3,r4);
SETKEY(r2, r3, r1, r4, 68)
GETKEY(r0, r1, r2, r3, 72);
S1(r0,r1,r2,r3,r4);
SETKEY(r3, r1, r2, r0, 72)
GETKEY(r0, r1, r2, r3, 76);
S0(r0,r1,r2,r3,r4);
SETKEY(r1, r4, r2, r0, 76)
GETKEY(r0, r1, r2, r3, 80);
S7(r0,r1,r2,r3,r4);
SETKEY(r2, r4, r3, r0, 80)
GETKEY(r0, r1, r2, r3, 84);
S6(r0,r1,r2,r3,r4)
SETKEY(r0, r1, r4, r2, 84)
GETKEY(r0, r1, r2, r3, 88);
S5(r0,r1,r2,r3,r4);
SETKEY(r1, r3, r0, r2, 88)
GETKEY(r0, r1, r2, r3, 92);
S4(r0,r1,r2,r3,r4)
SETKEY(r1, r4, r0, r3, 92)
GETKEY(r0, r1, r2, r3, 96);
S3(r0,r1,r2,r3,r4);
SETKEY(r1, r2, r3, r4, 96)
GETKEY(r0, r1, r2, r3, 100);
S2(r0,r1,r2,r3,r4);
SETKEY(r2, r3, r1, r4, 100)
GETKEY(r0, r1, r2, r3, 104);
S1(r0,r1,r2,r3,r4);
SETKEY(r3, r1, r2, r0, 104)
GETKEY(r0, r1, r2, r3, 108);
S0(r0,r1,r2,r3,r4);
SETKEY(r1, r4, r2, r0, 108)
GETKEY(r0, r1, r2, r3, 112);
S7(r0,r1,r2,r3,r4);
SETKEY(r2, r4, r3, r0, 112)
GETKEY(r0, r1, r2, r3, 116);
S6(r0,r1,r2,r3,r4)
SETKEY(r0, r1, r4, r2, 116)
GETKEY(r0, r1, r2, r3, 120);
S5(r0,r1,r2,r3,r4);
SETKEY(r1, r3, r0, r2, 120)
GETKEY(r0, r1, r2, r3, 124);
S4(r0,r1,r2,r3,r4)
SETKEY(r1, r4, r0, r3, 124)
GETKEY(r0, r1, r2, r3, 128);
S3(r0,r1,r2,r3,r4);
SETKEY(r1, r2, r3, r4, 128)
};
/* Encryption and decryption functions. The rounds are fully inlined.
* The sboxes alters the bit order of the output, and the altered
* bit ordrer is used progressivly. */
/* encrypt a block of text */
static void serpent_encrypt(u32 *l_key, const u8 *in, u8 *out, int wrongByteOrder)
{
const u32 *in_blk = (u32 *) in;
u32 *out_blk = (u32 *) out;
u32 r0,r1,r2,r3,r4;
if (wrongByteOrder) {
/* incorrect byte order */
r0 = io_swap_be(in_blk[3]);
r1 = io_swap_be(in_blk[2]);
r2 = io_swap_be(in_blk[1]);
r3 = io_swap_be(in_blk[0]);
} else {
/* correct byte order */
r0 = io_swap_le(in_blk[0]);
r1 = io_swap_le(in_blk[1]);
r2 = io_swap_le(in_blk[2]);
r3 = io_swap_le(in_blk[3]);
}
/* round 1 */
KEYMIX(r0,r1,r2,r3,r4,0);
S0(r0,r1,r2,r3,r4);
LINTRANS(r1,r4,r2,r0,r3);
/* round 2 */
KEYMIX(r1,r4,r2,r0,r3,4);
S1(r1,r4,r2,r0,r3);
LINTRANS(r0,r4,r2,r1,r3);
/* round 3 */
KEYMIX(r0,r4,r2,r1,r3,8);
S2(r0,r4,r2,r1,r3);
LINTRANS(r2,r1,r4,r3,r0);
/* round 4 */
KEYMIX(r2,r1,r4,r3,r0,12);
S3(r2,r1,r4,r3,r0);
LINTRANS(r1,r4,r3,r0,r2);
/* round 5 */
KEYMIX(r1,r4,r3,r0,r2,16);
S4(r1,r4,r3,r0,r2)
LINTRANS(r4,r2,r1,r0,r3);
/* round 6 */
KEYMIX(r4,r2,r1,r0,r3,20);
S5(r4,r2,r1,r0,r3);
LINTRANS(r2,r0,r4,r1,r3);
/* round 7 */
KEYMIX(r2,r0,r4,r1,r3,24);
S6(r2,r0,r4,r1,r3)
LINTRANS(r2,r0,r3,r4,r1);
/* round 8 */
KEYMIX(r2,r0,r3,r4,r1,28);
S7(r2,r0,r3,r4,r1);
LINTRANS(r3,r1,r4,r2,r0);
/* round 9 */
KEYMIX(r3,r1,r4,r2,r0,32);
S0(r3,r1,r4,r2,r0);
LINTRANS(r1,r0,r4,r3,r2);
/* round 10 */
KEYMIX(r1,r0,r4,r3,r2,36);
S1(r1,r0,r4,r3,r2);
LINTRANS(r3,r0,r4,r1,r2);
/* round 11 */
KEYMIX(r3,r0,r4,r1,r2,40);
S2(r3,r0,r4,r1,r2);
LINTRANS(r4,r1,r0,r2,r3);
/* round 12 */
KEYMIX(r4,r1,r0,r2,r3,44);
S3(r4,r1,r0,r2,r3);
LINTRANS(r1,r0,r2,r3,r4);
/* round 13 */
KEYMIX(r1,r0,r2,r3,r4,48);
S4(r1,r0,r2,r3,r4)
LINTRANS(r0,r4,r1,r3,r2);
/* round 14 */
KEYMIX(r0,r4,r1,r3,r2,52);
S5(r0,r4,r1,r3,r2);
LINTRANS(r4,r3,r0,r1,r2);
/* round 15 */
KEYMIX(r4,r3,r0,r1,r2,56);
S6(r4,r3,r0,r1,r2)
LINTRANS(r4,r3,r2,r0,r1);
/* round 16 */
KEYMIX(r4,r3,r2,r0,r1,60);
S7(r4,r3,r2,r0,r1);
LINTRANS(r2,r1,r0,r4,r3);
/* round 17 */
KEYMIX(r2,r1,r0,r4,r3,64);
S0(r2,r1,r0,r4,r3);
LINTRANS(r1,r3,r0,r2,r4);
/* round 18 */
KEYMIX(r1,r3,r0,r2,r4,68);
S1(r1,r3,r0,r2,r4);
LINTRANS(r2,r3,r0,r1,r4);
/* round 19 */
KEYMIX(r2,r3,r0,r1,r4,72);
S2(r2,r3,r0,r1,r4);
LINTRANS(r0,r1,r3,r4,r2);
/* round 20 */
KEYMIX(r0,r1,r3,r4,r2,76);
S3(r0,r1,r3,r4,r2);
LINTRANS(r1,r3,r4,r2,r0);
/* round 21 */
KEYMIX(r1,r3,r4,r2,r0,80);
S4(r1,r3,r4,r2,r0)
LINTRANS(r3,r0,r1,r2,r4);
/* round 22 */
KEYMIX(r3,r0,r1,r2,r4,84);
S5(r3,r0,r1,r2,r4);
LINTRANS(r0,r2,r3,r1,r4);
/* round 23 */
KEYMIX(r0,r2,r3,r1,r4,88);
S6(r0,r2,r3,r1,r4)
LINTRANS(r0,r2,r4,r3,r1);
/* round 24 */
KEYMIX(r0,r2,r4,r3,r1,92);
S7(r0,r2,r4,r3,r1);
LINTRANS(r4,r1,r3,r0,r2);
/* round 25 */
KEYMIX(r4,r1,r3,r0,r2,96);
S0(r4,r1,r3,r0,r2);
LINTRANS(r1,r2,r3,r4,r0);
/* round 26 */
KEYMIX(r1,r2,r3,r4,r0,100);
S1(r1,r2,r3,r4,r0);
LINTRANS(r4,r2,r3,r1,r0);
/* round 27 */
KEYMIX(r4,r2,r3,r1,r0,104);
S2(r4,r2,r3,r1,r0);
LINTRANS(r3,r1,r2,r0,r4);
/* round 28 */
KEYMIX(r3,r1,r2,r0,r4,108);
S3(r3,r1,r2,r0,r4);
LINTRANS(r1,r2,r0,r4,r3);
/* round 29 */
KEYMIX(r1,r2,r0,r4,r3,112);
S4(r1,r2,r0,r4,r3)
LINTRANS(r2,r3,r1,r4,r0);
/* round 30 */
KEYMIX(r2,r3,r1,r4,r0,116);
S5(r2,r3,r1,r4,r0);
LINTRANS(r3,r4,r2,r1,r0);
/* round 31 */
KEYMIX(r3,r4,r2,r1,r0,120);
S6(r3,r4,r2,r1,r0)
LINTRANS(r3,r4,r0,r2,r1);
/* round 32 */
KEYMIX(r3,r4,r0,r2,r1,124);
S7(r3,r4,r0,r2,r1);
KEYMIX(r0,r1,r2,r3,r4,128);
if (wrongByteOrder) {
/* incorrect byte order */
out_blk[3] = io_swap_be(r0);
out_blk[2] = io_swap_be(r1);
out_blk[1] = io_swap_be(r2);
out_blk[0] = io_swap_be(r3);
} else {
/* correct byte order */
out_blk[0] = io_swap_le(r0);
out_blk[1] = io_swap_le(r1);
out_blk[2] = io_swap_le(r2);
out_blk[3] = io_swap_le(r3);
}
};
/* decrypt a block of text */
static void serpent_decrypt(u32 *l_key, const u8 *in, u8 *out, int wrongByteOrder)
{
const u32 *in_blk = (const u32 *)in;
u32 *out_blk = (u32 *)out;
u32 r0,r1,r2,r3,r4;
if (wrongByteOrder) {
/* incorrect byte order */
r0 = io_swap_be(in_blk[3]);
r1 = io_swap_be(in_blk[2]);
r2 = io_swap_be(in_blk[1]);
r3 = io_swap_be(in_blk[0]);
} else {
/* correct byte order */
r0 = io_swap_le(in_blk[0]);
r1 = io_swap_le(in_blk[1]);
r2 = io_swap_le(in_blk[2]);
r3 = io_swap_le(in_blk[3]);
}
/* round 1 */
KEYMIX(r0,r1,r2,r3,r4,128);
I7(r0,r1,r2,r3,r4);
KEYMIX(r3,r0,r1,r4,r2,124);
/* round 2 */
ILINTRANS(r3,r0,r1,r4,r2);
I6(r3,r0,r1,r4,r2);
KEYMIX(r0,r1,r2,r4,r3,120);
/* round 3 */
ILINTRANS(r0,r1,r2,r4,r3);
I5(r0,r1,r2,r4,r3);
KEYMIX(r1,r3,r4,r2,r0,116);
/* round 4 */
ILINTRANS(r1,r3,r4,r2,r0);
I4(r1,r3,r4,r2,r0);
KEYMIX(r1,r2,r4,r0,r3,112);
/* round 5 */
ILINTRANS(r1,r2,r4,r0,r3);
I3(r1,r2,r4,r0,r3);
KEYMIX(r4,r2,r0,r1,r3,108);
/* round 6 */
ILINTRANS(r4,r2,r0,r1,r3);
I2(r4,r2,r0,r1,r3);
KEYMIX(r2,r3,r0,r1,r4,104);
/* round 7 */
ILINTRANS(r2,r3,r0,r1,r4);
I1(r2,r3,r0,r1,r4);
KEYMIX(r4,r2,r1,r0,r3,100);
/* round 8 */
ILINTRANS(r4,r2,r1,r0,r3);
I0(r4,r2,r1,r0,r3);
KEYMIX(r4,r3,r2,r0,r1,96);
/* round 9 */
ILINTRANS(r4,r3,r2,r0,r1);
I7(r4,r3,r2,r0,r1);
KEYMIX(r0,r4,r3,r1,r2,92);
/* round 10 */
ILINTRANS(r0,r4,r3,r1,r2);
I6(r0,r4,r3,r1,r2);
KEYMIX(r4,r3,r2,r1,r0,88);
/* round 11 */
ILINTRANS(r4,r3,r2,r1,r0);
I5(r4,r3,r2,r1,r0);
KEYMIX(r3,r0,r1,r2,r4,84);
/* round 12 */
ILINTRANS(r3,r0,r1,r2,r4);
I4(r3,r0,r1,r2,r4);
KEYMIX(r3,r2,r1,r4,r0,80);
/* round 13 */
ILINTRANS(r3,r2,r1,r4,r0);
I3(r3,r2,r1,r4,r0);
KEYMIX(r1,r2,r4,r3,r0,76);
/* round 14 */
ILINTRANS(r1,r2,r4,r3,r0);
I2(r1,r2,r4,r3,r0);
KEYMIX(r2,r0,r4,r3,r1,72);
/* round 15 */
ILINTRANS(r2,r0,r4,r3,r1);
I1(r2,r0,r4,r3,r1);
KEYMIX(r1,r2,r3,r4,r0,68);
/* round 16 */
ILINTRANS(r1,r2,r3,r4,r0);
I0(r1,r2,r3,r4,r0);
KEYMIX(r1,r0,r2,r4,r3,64);
/* round 17 */
ILINTRANS(r1,r0,r2,r4,r3);
I7(r1,r0,r2,r4,r3);
KEYMIX(r4,r1,r0,r3,r2,60);
/* round 18 */
ILINTRANS(r4,r1,r0,r3,r2);
I6(r4,r1,r0,r3,r2);
KEYMIX(r1,r0,r2,r3,r4,56);
/* round 19 */
ILINTRANS(r1,r0,r2,r3,r4);
I5(r1,r0,r2,r3,r4);
KEYMIX(r0,r4,r3,r2,r1,52);
/* round 20 */
ILINTRANS(r0,r4,r3,r2,r1);
I4(r0,r4,r3,r2,r1);
KEYMIX(r0,r2,r3,r1,r4,48);
/* round 21 */
ILINTRANS(r0,r2,r3,r1,r4);
I3(r0,r2,r3,r1,r4);
KEYMIX(r3,r2,r1,r0,r4,44);
/* round 22 */
ILINTRANS(r3,r2,r1,r0,r4);
I2(r3,r2,r1,r0,r4);
KEYMIX(r2,r4,r1,r0,r3,40);
/* round 23 */
ILINTRANS(r2,r4,r1,r0,r3);
I1(r2,r4,r1,r0,r3);
KEYMIX(r3,r2,r0,r1,r4,36);
/* round 24 */
ILINTRANS(r3,r2,r0,r1,r4);
I0(r3,r2,r0,r1,r4);
KEYMIX(r3,r4,r2,r1,r0,32);
/* round 25 */
ILINTRANS(r3,r4,r2,r1,r0);
I7(r3,r4,r2,r1,r0);
KEYMIX(r1,r3,r4,r0,r2,28);
/* round 26 */
ILINTRANS(r1,r3,r4,r0,r2);
I6(r1,r3,r4,r0,r2);
KEYMIX(r3,r4,r2,r0,r1,24);
/* round 27 */
ILINTRANS(r3,r4,r2,r0,r1);
I5(r3,r4,r2,r0,r1);
KEYMIX(r4,r1,r0,r2,r3,20);
/* round 28 */
ILINTRANS(r4,r1,r0,r2,r3);
I4(r4,r1,r0,r2,r3);
KEYMIX(r4,r2,r0,r3,r1,16);
/* round 29 */
ILINTRANS(r4,r2,r0,r3,r1);
I3(r4,r2,r0,r3,r1);
KEYMIX(r0,r2,r3,r4,r1,12);
/* round 30 */
ILINTRANS(r0,r2,r3,r4,r1);
I2(r0,r2,r3,r4,r1);
KEYMIX(r2,r1,r3,r4,r0,8);
/* round 31 */
ILINTRANS(r2,r1,r3,r4,r0);
I1(r2,r1,r3,r4,r0);
KEYMIX(r0,r2,r4,r3,r1,4);
/* round 32 */
ILINTRANS(r0,r2,r4,r3,r1);
I0(r0,r2,r4,r3,r1);
KEYMIX(r0,r1,r2,r3,r4,0);
if (wrongByteOrder) {
/* incorrect byte order */
out_blk[3] = io_swap_be(r0);
out_blk[2] = io_swap_be(r1);
out_blk[1] = io_swap_be(r2);
out_blk[0] = io_swap_be(r3);
} else {
/* correct byte order */
out_blk[0] = io_swap_le(r0);
out_blk[1] = io_swap_le(r1);
out_blk[2] = io_swap_le(r2);
out_blk[3] = io_swap_le(r3);
}
};
#if LINUX_VERSION_CODE >= 0x20600
typedef sector_t TransferSector_t;
# define LoopInfo_t struct loop_info64
#else
typedef int TransferSector_t;
# define LoopInfo_t struct loop_info
#endif
#if !defined(LOOP_MULTI_KEY_SETUP)
# define LOOP_MULTI_KEY_SETUP 0x4C4D
#endif
#if !defined(LOOP_MULTI_KEY_SETUP_V3)
# define LOOP_MULTI_KEY_SETUP_V3 0x4C4E
#endif
extern void loop_compute_sector_iv(TransferSector_t, u_int32_t *);
extern void loop_compute_md5_iv_v3(TransferSector_t, u_int32_t *, u_int32_t *);
typedef struct {
u32 k[140];
} serpent_context;
typedef struct {
serpent_context *keyPtr[64];
unsigned keyMask;
u_int32_t partialMD5[4];
} SerpentMultiKey;
static SerpentMultiKey *allocMultiKey(void)
{
SerpentMultiKey *m;
serpent_context *a;
int x, n;
m = (SerpentMultiKey *) kmalloc(sizeof(SerpentMultiKey), GFP_KERNEL);
if(!m) return 0;
memset(m, 0, sizeof(SerpentMultiKey));
n = PAGE_SIZE / sizeof(serpent_context);
if(!n) n = 1;
a = (serpent_context *) kmalloc(sizeof(serpent_context) * n, GFP_KERNEL);
if(!a) {
kfree(m);
return 0;
}
x = 0;
while((x < 64) && n) {
m->keyPtr[x] = a;
a++;
x++;
n--;
}
return m;
}
static void clearAndFreeMultiKey(SerpentMultiKey *m)
{
serpent_context *a;
int x, n;
n = PAGE_SIZE / sizeof(serpent_context);
if(!n) n = 1;
x = 0;
while(x < 64) {
a = m->keyPtr[x];
if(!a) break;
memset(a, 0, sizeof(serpent_context) * n);
kfree(a);
x += n;
}
memset(m, 0, sizeof(SerpentMultiKey));
kfree(m);
}
static int multiKeySetup(struct loop_device *lo, unsigned char *k, int version3)
{
SerpentMultiKey *m;
serpent_context *a;
int x, y, n;
union {
u_int32_t w[16];
unsigned char b[64];
} un;
/* lo->lo_init[0] == 0 or 1 means correct byte order serpent */
/* lo->lo_init[0] == 2 means inverted byte order serpent */
int wrongByteOrder = (lo->lo_init[0] == 2);
extern void md5_transform_CPUbyteorder_C(u_int32_t *, u_int32_t const *);
#if LINUX_VERSION_CODE >= 0x20200
if(lo->lo_key_owner != current->uid && !capable(CAP_SYS_ADMIN))
return -EPERM;
#endif
m = (SerpentMultiKey *)lo->key_data;
if(!m) return -ENXIO;
n = PAGE_SIZE / sizeof(serpent_context);
if(!n) n = 1;
x = 0;
while(x < 64) {
if(!m->keyPtr[x]) {
a = (serpent_context *) kmalloc(sizeof(serpent_context) * n, GFP_KERNEL);
if(!a) return -ENOMEM;
y = x;
while((y < (x + n)) && (y < 64)) {
m->keyPtr[y] = a;
a++;
y++;
}
}
if(copy_from_user(&un.b[0], k, 32)) return -EFAULT;
serpent_set_key(&m->keyPtr[x]->k[0], &un.b[0], lo->lo_encrypt_key_size, wrongByteOrder);
k += 32;
x++;
}
m->partialMD5[0] = 0x67452301;
m->partialMD5[1] = 0xefcdab89;
m->partialMD5[2] = 0x98badcfe;
m->partialMD5[3] = 0x10325476;
if(version3) {
/* only first 128 bits of iv-key is used */
if(copy_from_user(&un.b[0], k, 16)) return -EFAULT;
#if defined(__BIG_ENDIAN)
un.w[0] = cpu_to_le32(un.w[0]);
un.w[1] = cpu_to_le32(un.w[1]);
un.w[2] = cpu_to_le32(un.w[2]);
un.w[3] = cpu_to_le32(un.w[3]);
#endif
memset(&un.b[16], 0, 48);
md5_transform_CPUbyteorder_C(&m->partialMD5[0], &un.w[0]);
lo->lo_flags |= 0x080000; /* multi-key-v3 (info exported to user space) */
}
m->keyMask = 0x3F; /* range 0...63 */
lo->lo_flags |= 0x100000; /* multi-key (info exported to user space) */
memset(&un.b[0], 0, 32);
return 0;
}
static int transfer_serpent(struct loop_device *lo, int cmd, char *raw_buf,
char *loop_buf, int size, TransferSector_t devSect)
{
serpent_context *a;
SerpentMultiKey *m;
int x;
unsigned y;
u_int32_t iv[8];
/* lo->lo_init[0] == 0 or 1 means correct byte order serpent */
/* lo->lo_init[0] == 2 means inverted byte order serpent */
int wrongByteOrder = (lo->lo_init[0] == 2);
if(!size || (size & 511)) {
return -EINVAL;
}
m = (SerpentMultiKey *)lo->key_data;
y = m->keyMask;
if(cmd == READ) {
while(size) {
a = m->keyPtr[((unsigned)devSect) & y];
if(y) {
memcpy(&iv[0], raw_buf, 16);
raw_buf += 16;
loop_buf += 16;
} else {
loop_compute_sector_iv(devSect, &iv[0]);
}
x = 15;
do {
memcpy(&iv[4], raw_buf, 16);
serpent_decrypt(&a->k[0], raw_buf, loop_buf, wrongByteOrder);
*((u_int32_t *)(&loop_buf[ 0])) ^= iv[0];
*((u_int32_t *)(&loop_buf[ 4])) ^= iv[1];
*((u_int32_t *)(&loop_buf[ 8])) ^= iv[2];
*((u_int32_t *)(&loop_buf[12])) ^= iv[3];
if(y && !x) {
raw_buf -= 496;
loop_buf -= 496;
memcpy(&iv[4], &m->partialMD5[0], 16);
loop_compute_md5_iv_v3(devSect, &iv[4], (u_int32_t *)(&loop_buf[16]));
} else {
raw_buf += 16;
loop_buf += 16;
memcpy(&iv[0], raw_buf, 16);
}
serpent_decrypt(&a->k[0], raw_buf, loop_buf, wrongByteOrder);
*((u_int32_t *)(&loop_buf[ 0])) ^= iv[4];
*((u_int32_t *)(&loop_buf[ 4])) ^= iv[5];
*((u_int32_t *)(&loop_buf[ 8])) ^= iv[6];
*((u_int32_t *)(&loop_buf[12])) ^= iv[7];
if(y && !x) {
raw_buf += 512;
loop_buf += 512;
} else {
raw_buf += 16;
loop_buf += 16;
}
} while(--x >= 0);
#if LINUX_VERSION_CODE >= 0x20600
cond_resched();
#elif LINUX_VERSION_CODE >= 0x20400
if(current->need_resched) {set_current_state(TASK_RUNNING);schedule();}
#else
if(current->need_resched) {current->state=TASK_RUNNING;schedule();}
#endif
size -= 512;
devSect++;
}
} else {
while(size) {
a = m->keyPtr[((unsigned)devSect) & y];
if(y) {
#if LINUX_VERSION_CODE < 0x20400
/* on 2.2 and older kernels, real raw_buf may be doing */
/* writes at any time, so this needs to be stack buffer */
u_int32_t tmp_raw_buf[128];
char *TMP_RAW_BUF = (char *)(&tmp_raw_buf[0]);
#else
/* on 2.4 and later kernels, real raw_buf is not doing */
/* any writes now so it can be used as temp buffer */
# define TMP_RAW_BUF raw_buf
#endif
memcpy(TMP_RAW_BUF, loop_buf, 512);
memcpy(&iv[0], &m->partialMD5[0], 16);
loop_compute_md5_iv_v3(devSect, &iv[0], (u_int32_t *)(&TMP_RAW_BUF[16]));
x = 15;
do {
iv[0] ^= *((u_int32_t *)(&TMP_RAW_BUF[ 0]));
iv[1] ^= *((u_int32_t *)(&TMP_RAW_BUF[ 4]));
iv[2] ^= *((u_int32_t *)(&TMP_RAW_BUF[ 8]));
iv[3] ^= *((u_int32_t *)(&TMP_RAW_BUF[12]));
serpent_encrypt(&a->k[0], (unsigned char *)(&iv[0]), raw_buf, wrongByteOrder);
memcpy(&iv[0], raw_buf, 16);
raw_buf += 16;
#if LINUX_VERSION_CODE < 0x20400
TMP_RAW_BUF += 16;
#endif
iv[0] ^= *((u_int32_t *)(&TMP_RAW_BUF[ 0]));
iv[1] ^= *((u_int32_t *)(&TMP_RAW_BUF[ 4]));
iv[2] ^= *((u_int32_t *)(&TMP_RAW_BUF[ 8]));
iv[3] ^= *((u_int32_t *)(&TMP_RAW_BUF[12]));
serpent_encrypt(&a->k[0], (unsigned char *)(&iv[0]), raw_buf, wrongByteOrder);
memcpy(&iv[0], raw_buf, 16);
raw_buf += 16;
#if LINUX_VERSION_CODE < 0x20400
TMP_RAW_BUF += 16;
#endif
} while(--x >= 0);
loop_buf += 512;
} else {
loop_compute_sector_iv(devSect, &iv[0]);
x = 15;
do {
iv[0] ^= *((u_int32_t *)(&loop_buf[ 0]));
iv[1] ^= *((u_int32_t *)(&loop_buf[ 4]));
iv[2] ^= *((u_int32_t *)(&loop_buf[ 8]));
iv[3] ^= *((u_int32_t *)(&loop_buf[12]));
serpent_encrypt(&a->k[0], (unsigned char *)(&iv[0]), raw_buf, wrongByteOrder);
memcpy(&iv[0], raw_buf, 16);
loop_buf += 16;
raw_buf += 16;
iv[0] ^= *((u_int32_t *)(&loop_buf[ 0]));
iv[1] ^= *((u_int32_t *)(&loop_buf[ 4]));
iv[2] ^= *((u_int32_t *)(&loop_buf[ 8]));
iv[3] ^= *((u_int32_t *)(&loop_buf[12]));
serpent_encrypt(&a->k[0], (unsigned char *)(&iv[0]), raw_buf, wrongByteOrder);
memcpy(&iv[0], raw_buf, 16);
loop_buf += 16;
raw_buf += 16;
} while(--x >= 0);
}
#if LINUX_VERSION_CODE >= 0x20600
cond_resched();
#elif LINUX_VERSION_CODE >= 0x20400
if(current->need_resched) {set_current_state(TASK_RUNNING);schedule();}
#else
if(current->need_resched) {current->state=TASK_RUNNING;schedule();}
#endif
size -= 512;
devSect++;
}
}
return(0);
}
static int keySetup_serpent(struct loop_device *lo, LoopInfo_t *info)
{
SerpentMultiKey *m;
/* lo->lo_init[0] == 0 or 1 means correct byte order serpent */
/* lo->lo_init[0] == 2 means inverted byte order serpent */
int wrongByteOrder = (info->lo_init[0] == 2);
lo->key_data = m = allocMultiKey();
if(!m) return(-ENOMEM);
serpent_set_key(&m->keyPtr[0]->k[0], &info->lo_encrypt_key[0],
info->lo_encrypt_key_size, wrongByteOrder);
memset(&info->lo_encrypt_key[0], 0, sizeof(info->lo_encrypt_key));
return(0);
}
static int keyClean_serpent(struct loop_device *lo)
{
if(lo->key_data) {
clearAndFreeMultiKey((SerpentMultiKey *)lo->key_data);
lo->key_data = 0;
}
return(0);
}
static int handleIoctl_serpent(struct loop_device *lo, int cmd, unsigned long arg)
{
int err;
switch (cmd) {
case LOOP_MULTI_KEY_SETUP:
err = multiKeySetup(lo, (unsigned char *)arg, 0);
break;
case LOOP_MULTI_KEY_SETUP_V3:
err = multiKeySetup(lo, (unsigned char *)arg, 1);
break;
default:
err = -EINVAL;
}
return err;
}
#if LINUX_VERSION_CODE < 0x20600
static void lock_serpent(struct loop_device *lo)
{
MOD_INC_USE_COUNT;
}
static void unlock_serpent(struct loop_device *lo)
{
MOD_DEC_USE_COUNT;
}
#endif
static struct loop_func_table funcs_serpent = {
number: 7, /* 7 == LO_CRYPT_SERPENT */
transfer: (void *) transfer_serpent,
init: (void *) keySetup_serpent,
release: keyClean_serpent,
#if LINUX_VERSION_CODE >= 0x20600
owner: THIS_MODULE,
#else
lock: lock_serpent,
unlock: unlock_serpent,
#endif
ioctl: (void *) handleIoctl_serpent
};
#if LINUX_VERSION_CODE >= 0x20600
# define loop_serpent_init __init loop_serpent_initfn
# define loop_serpent_exit loop_serpent_exitfn
#else
# define loop_serpent_init init_module
# define loop_serpent_exit cleanup_module
#endif
int loop_serpent_init(void)
{
if (loop_register_transfer(&funcs_serpent)) {
printk(KERN_WARNING "loop: unable to register serpent transfer\n");
return -EIO;
}
printk(KERN_INFO "loop: registered serpent encryption\n");
return 0;
}
void loop_serpent_exit(void)
{
if (loop_unregister_transfer(funcs_serpent.number)) {
printk(KERN_WARNING "loop: unable to unregister serpent transfer\n");
return;
}
printk(KERN_INFO "loop: unregistered serpent encryption\n");
}
#if LINUX_VERSION_CODE >= 0x20600
module_init(loop_serpent_initfn);
module_exit(loop_serpent_exitfn);
#endif
#if defined(MODULE_LICENSE)
MODULE_LICENSE("GPL");
#endif
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