crypto/gf128mul.c - kernel/msm-4.19 - Gitiles

 /* gf128mul.c - GF(2^128) multiplication functions
  *
  * Copyright (c) 2003, Dr Brian Gladman, Worcester, UK.
  * Copyright (c) 2006, Rik Snel <rsnel@cube.dyndns.org>
  *
  * Based on Dr Brian Gladman's (GPL'd) work published at
  * http://gladman.plushost.co.uk/oldsite/cryptography_technology/index.php
  * See the original copyright notice below.
  *
  * 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) 2003, Dr Brian Gladman, 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.
  ---------------------------------------------------------------------------
  Issue 31/01/2006

  This file provides fast multiplication in GF(128) as required by several
  cryptographic authentication modes
 */

 #include <crypto/gf128mul.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>

 #define gf128mul_dat(q) { \
 	q(0x00), q(0x01), q(0x02), q(0x03), q(0x04), q(0x05), q(0x06), q(0x07),\
 	q(0x08), q(0x09), q(0x0a), q(0x0b), q(0x0c), q(0x0d), q(0x0e), q(0x0f),\
 	q(0x10), q(0x11), q(0x12), q(0x13), q(0x14), q(0x15), q(0x16), q(0x17),\
 	q(0x18), q(0x19), q(0x1a), q(0x1b), q(0x1c), q(0x1d), q(0x1e), q(0x1f),\
 	q(0x20), q(0x21), q(0x22), q(0x23), q(0x24), q(0x25), q(0x26), q(0x27),\
 	q(0x28), q(0x29), q(0x2a), q(0x2b), q(0x2c), q(0x2d), q(0x2e), q(0x2f),\
 	q(0x30), q(0x31), q(0x32), q(0x33), q(0x34), q(0x35), q(0x36), q(0x37),\
 	q(0x38), q(0x39), q(0x3a), q(0x3b), q(0x3c), q(0x3d), q(0x3e), q(0x3f),\
 	q(0x40), q(0x41), q(0x42), q(0x43), q(0x44), q(0x45), q(0x46), q(0x47),\
 	q(0x48), q(0x49), q(0x4a), q(0x4b), q(0x4c), q(0x4d), q(0x4e), q(0x4f),\
 	q(0x50), q(0x51), q(0x52), q(0x53), q(0x54), q(0x55), q(0x56), q(0x57),\
 	q(0x58), q(0x59), q(0x5a), q(0x5b), q(0x5c), q(0x5d), q(0x5e), q(0x5f),\
 	q(0x60), q(0x61), q(0x62), q(0x63), q(0x64), q(0x65), q(0x66), q(0x67),\
 	q(0x68), q(0x69), q(0x6a), q(0x6b), q(0x6c), q(0x6d), q(0x6e), q(0x6f),\
 	q(0x70), q(0x71), q(0x72), q(0x73), q(0x74), q(0x75), q(0x76), q(0x77),\
 	q(0x78), q(0x79), q(0x7a), q(0x7b), q(0x7c), q(0x7d), q(0x7e), q(0x7f),\
 	q(0x80), q(0x81), q(0x82), q(0x83), q(0x84), q(0x85), q(0x86), q(0x87),\
 	q(0x88), q(0x89), q(0x8a), q(0x8b), q(0x8c), q(0x8d), q(0x8e), q(0x8f),\
 	q(0x90), q(0x91), q(0x92), q(0x93), q(0x94), q(0x95), q(0x96), q(0x97),\
 	q(0x98), q(0x99), q(0x9a), q(0x9b), q(0x9c), q(0x9d), q(0x9e), q(0x9f),\
 	q(0xa0), q(0xa1), q(0xa2), q(0xa3), q(0xa4), q(0xa5), q(0xa6), q(0xa7),\
 	q(0xa8), q(0xa9), q(0xaa), q(0xab), q(0xac), q(0xad), q(0xae), q(0xaf),\
 	q(0xb0), q(0xb1), q(0xb2), q(0xb3), q(0xb4), q(0xb5), q(0xb6), q(0xb7),\
 	q(0xb8), q(0xb9), q(0xba), q(0xbb), q(0xbc), q(0xbd), q(0xbe), q(0xbf),\
 	q(0xc0), q(0xc1), q(0xc2), q(0xc3), q(0xc4), q(0xc5), q(0xc6), q(0xc7),\
 	q(0xc8), q(0xc9), q(0xca), q(0xcb), q(0xcc), q(0xcd), q(0xce), q(0xcf),\
 	q(0xd0), q(0xd1), q(0xd2), q(0xd3), q(0xd4), q(0xd5), q(0xd6), q(0xd7),\
 	q(0xd8), q(0xd9), q(0xda), q(0xdb), q(0xdc), q(0xdd), q(0xde), q(0xdf),\
 	q(0xe0), q(0xe1), q(0xe2), q(0xe3), q(0xe4), q(0xe5), q(0xe6), q(0xe7),\
 	q(0xe8), q(0xe9), q(0xea), q(0xeb), q(0xec), q(0xed), q(0xee), q(0xef),\
 	q(0xf0), q(0xf1), q(0xf2), q(0xf3), q(0xf4), q(0xf5), q(0xf6), q(0xf7),\
 	q(0xf8), q(0xf9), q(0xfa), q(0xfb), q(0xfc), q(0xfd), q(0xfe), q(0xff) \
 }

 /*	Given the value i in 0..255 as the byte overflow when a field element
     in GHASH is multiplied by x^8, this function will return the values that
     are generated in the lo 16-bit word of the field value by applying the
     modular polynomial. The values lo_byte and hi_byte are returned via the
     macro xp_fun(lo_byte, hi_byte) so that the values can be assembled into
     memory as required by a suitable definition of this macro operating on
     the table above
 */

 #define xx(p, q)	0x##p##q

 #define xda_bbe(i) ( \
 	(i & 0x80 ? xx(43, 80) : 0) ^ (i & 0x40 ? xx(21, c0) : 0) ^ \
 	(i & 0x20 ? xx(10, e0) : 0) ^ (i & 0x10 ? xx(08, 70) : 0) ^ \
 	(i & 0x08 ? xx(04, 38) : 0) ^ (i & 0x04 ? xx(02, 1c) : 0) ^ \
 	(i & 0x02 ? xx(01, 0e) : 0) ^ (i & 0x01 ? xx(00, 87) : 0) \
 )

 #define xda_lle(i) ( \
 	(i & 0x80 ? xx(e1, 00) : 0) ^ (i & 0x40 ? xx(70, 80) : 0) ^ \
 	(i & 0x20 ? xx(38, 40) : 0) ^ (i & 0x10 ? xx(1c, 20) : 0) ^ \
 	(i & 0x08 ? xx(0e, 10) : 0) ^ (i & 0x04 ? xx(07, 08) : 0) ^ \
 	(i & 0x02 ? xx(03, 84) : 0) ^ (i & 0x01 ? xx(01, c2) : 0) \
 )

 static const u16 gf128mul_table_lle[256] = gf128mul_dat(xda_lle);
 static const u16 gf128mul_table_bbe[256] = gf128mul_dat(xda_bbe);

 /* These functions multiply a field element by x, by x^4 and by x^8
  * in the polynomial field representation. It uses 32-bit word operations
  * to gain speed but compensates for machine endianess and hence works
  * correctly on both styles of machine.
  */

 static void gf128mul_x_lle(be128 *r, const be128 *x)
 {
 	u64 a = be64_to_cpu(x->a);
 	u64 b = be64_to_cpu(x->b);
 	u64 _tt = gf128mul_table_lle[(b << 7) & 0xff];

 	r->b = cpu_to_be64((b >> 1) | (a << 63));
 	r->a = cpu_to_be64((a >> 1) ^ (_tt << 48));
 }

 static void gf128mul_x_bbe(be128 *r, const be128 *x)
 {
 	u64 a = be64_to_cpu(x->a);
 	u64 b = be64_to_cpu(x->b);
 	u64 _tt = gf128mul_table_bbe[a >> 63];

 	r->a = cpu_to_be64((a << 1) | (b >> 63));
 	r->b = cpu_to_be64((b << 1) ^ _tt);
 }

 void gf128mul_x_ble(be128 *r, const be128 *x)
 {
 	u64 a = le64_to_cpu(x->a);
 	u64 b = le64_to_cpu(x->b);
 	u64 _tt = gf128mul_table_bbe[b >> 63];

 	r->a = cpu_to_le64((a << 1) ^ _tt);
 	r->b = cpu_to_le64((b << 1) | (a >> 63));
 }
 EXPORT_SYMBOL(gf128mul_x_ble);

 static void gf128mul_x8_lle(be128 *x)
 {
 	u64 a = be64_to_cpu(x->a);
 	u64 b = be64_to_cpu(x->b);
 	u64 _tt = gf128mul_table_lle[b & 0xff];

 	x->b = cpu_to_be64((b >> 8) | (a << 56));
 	x->a = cpu_to_be64((a >> 8) ^ (_tt << 48));
 }

 static void gf128mul_x8_bbe(be128 *x)
 {
 	u64 a = be64_to_cpu(x->a);
 	u64 b = be64_to_cpu(x->b);
 	u64 _tt = gf128mul_table_bbe[a >> 56];

 	x->a = cpu_to_be64((a << 8) | (b >> 56));
 	x->b = cpu_to_be64((b << 8) ^ _tt);
 }

 void gf128mul_lle(be128 *r, const be128 *b)
 {
 	be128 p[8];
 	int i;

 	p[0] = *r;
 	for (i = 0; i < 7; ++i)
 		gf128mul_x_lle(&p[i + 1], &p[i]);

 	memset(r, 0, sizeof(*r));
 	for (i = 0;;) {
 		u8 ch = ((u8 *)b)[15 - i];

 		if (ch & 0x80)
 			be128_xor(r, r, &p[0]);
 		if (ch & 0x40)
 			be128_xor(r, r, &p[1]);
 		if (ch & 0x20)
 			be128_xor(r, r, &p[2]);
 		if (ch & 0x10)
 			be128_xor(r, r, &p[3]);
 		if (ch & 0x08)
 			be128_xor(r, r, &p[4]);
 		if (ch & 0x04)
 			be128_xor(r, r, &p[5]);
 		if (ch & 0x02)
 			be128_xor(r, r, &p[6]);
 		if (ch & 0x01)
 			be128_xor(r, r, &p[7]);

 		if (++i >= 16)
 			break;

 		gf128mul_x8_lle(r);
 	}
 }
 EXPORT_SYMBOL(gf128mul_lle);

 void gf128mul_bbe(be128 *r, const be128 *b)
 {
 	be128 p[8];
 	int i;

 	p[0] = *r;
 	for (i = 0; i < 7; ++i)
 		gf128mul_x_bbe(&p[i + 1], &p[i]);

 	memset(r, 0, sizeof(*r));
 	for (i = 0;;) {
 		u8 ch = ((u8 *)b)[i];

 		if (ch & 0x80)
 			be128_xor(r, r, &p[7]);
 		if (ch & 0x40)
 			be128_xor(r, r, &p[6]);
 		if (ch & 0x20)
 			be128_xor(r, r, &p[5]);
 		if (ch & 0x10)
 			be128_xor(r, r, &p[4]);
 		if (ch & 0x08)
 			be128_xor(r, r, &p[3]);
 		if (ch & 0x04)
 			be128_xor(r, r, &p[2]);
 		if (ch & 0x02)
 			be128_xor(r, r, &p[1]);
 		if (ch & 0x01)
 			be128_xor(r, r, &p[0]);

 		if (++i >= 16)
 			break;

 		gf128mul_x8_bbe(r);
 	}
 }
 EXPORT_SYMBOL(gf128mul_bbe);

 /*      This version uses 64k bytes of table space.
     A 16 byte buffer has to be multiplied by a 16 byte key
     value in GF(128).  If we consider a GF(128) value in
     the buffer's lowest byte, we can construct a table of
     the 256 16 byte values that result from the 256 values
     of this byte.  This requires 4096 bytes. But we also
     need tables for each of the 16 higher bytes in the
     buffer as well, which makes 64 kbytes in total.
 */
 /* additional explanation
  * t[0][BYTE] contains g*BYTE
  * t[1][BYTE] contains g*x^8*BYTE
  *  ..
  * t[15][BYTE] contains g*x^120*BYTE */
 struct gf128mul_64k *gf128mul_init_64k_bbe(const be128 *g)
 {
 	struct gf128mul_64k *t;
 	int i, j, k;

 	t = kzalloc(sizeof(*t), GFP_KERNEL);
 	if (!t)
 		goto out;

 	for (i = 0; i < 16; i++) {
 		t->t[i] = kzalloc(sizeof(*t->t[i]), GFP_KERNEL);
 		if (!t->t[i]) {
 			gf128mul_free_64k(t);
 			t = NULL;
 			goto out;
 		}
 	}

 	t->t[0]->t[1] = *g;
 	for (j = 1; j <= 64; j <<= 1)
 		gf128mul_x_bbe(&t->t[0]->t[j + j], &t->t[0]->t[j]);

 	for (i = 0;;) {
 		for (j = 2; j < 256; j += j)
 			for (k = 1; k < j; ++k)
 				be128_xor(&t->t[i]->t[j + k],
 					  &t->t[i]->t[j], &t->t[i]->t[k]);

 		if (++i >= 16)
 			break;

 		for (j = 128; j > 0; j >>= 1) {
 			t->t[i]->t[j] = t->t[i - 1]->t[j];
 			gf128mul_x8_bbe(&t->t[i]->t[j]);
 		}
 	}

 out:
 	return t;
 }
 EXPORT_SYMBOL(gf128mul_init_64k_bbe);

 void gf128mul_free_64k(struct gf128mul_64k *t)
 {
 	int i;

 	for (i = 0; i < 16; i++)
 		kzfree(t->t[i]);
 	kzfree(t);
 }
 EXPORT_SYMBOL(gf128mul_free_64k);

 void gf128mul_64k_bbe(be128 *a, struct gf128mul_64k *t)
 {
 	u8 *ap = (u8 *)a;
 	be128 r[1];
 	int i;

 	*r = t->t[0]->t[ap[15]];
 	for (i = 1; i < 16; ++i)
 		be128_xor(r, r, &t->t[i]->t[ap[15 - i]]);
 	*a = *r;
 }
 EXPORT_SYMBOL(gf128mul_64k_bbe);

 /*      This version uses 4k bytes of table space.
     A 16 byte buffer has to be multiplied by a 16 byte key
     value in GF(128).  If we consider a GF(128) value in a
     single byte, we can construct a table of the 256 16 byte
     values that result from the 256 values of this byte.
     This requires 4096 bytes. If we take the highest byte in
     the buffer and use this table to get the result, we then
     have to multiply by x^120 to get the final value. For the
     next highest byte the result has to be multiplied by x^112
     and so on. But we can do this by accumulating the result
     in an accumulator starting with the result for the top
     byte.  We repeatedly multiply the accumulator value by
     x^8 and then add in (i.e. xor) the 16 bytes of the next
     lower byte in the buffer, stopping when we reach the
     lowest byte. This requires a 4096 byte table.
 */
 struct gf128mul_4k *gf128mul_init_4k_lle(const be128 *g)
 {
 	struct gf128mul_4k *t;
 	int j, k;

 	t = kzalloc(sizeof(*t), GFP_KERNEL);
 	if (!t)
 		goto out;

 	t->t[128] = *g;
 	for (j = 64; j > 0; j >>= 1)
 		gf128mul_x_lle(&t->t[j], &t->t[j+j]);

 	for (j = 2; j < 256; j += j)
 		for (k = 1; k < j; ++k)
 			be128_xor(&t->t[j + k], &t->t[j], &t->t[k]);

 out:
 	return t;
 }
 EXPORT_SYMBOL(gf128mul_init_4k_lle);

 struct gf128mul_4k *gf128mul_init_4k_bbe(const be128 *g)
 {
 	struct gf128mul_4k *t;
 	int j, k;

 	t = kzalloc(sizeof(*t), GFP_KERNEL);
 	if (!t)
 		goto out;

 	t->t[1] = *g;
 	for (j = 1; j <= 64; j <<= 1)
 		gf128mul_x_bbe(&t->t[j + j], &t->t[j]);

 	for (j = 2; j < 256; j += j)
 		for (k = 1; k < j; ++k)
 			be128_xor(&t->t[j + k], &t->t[j], &t->t[k]);

 out:
 	return t;
 }
 EXPORT_SYMBOL(gf128mul_init_4k_bbe);

 void gf128mul_4k_lle(be128 *a, struct gf128mul_4k *t)
 {
 	u8 *ap = (u8 *)a;
 	be128 r[1];
 	int i = 15;

 	*r = t->t[ap[15]];
 	while (i--) {
 		gf128mul_x8_lle(r);
 		be128_xor(r, r, &t->t[ap[i]]);
 	}
 	*a = *r;
 }
 EXPORT_SYMBOL(gf128mul_4k_lle);

 void gf128mul_4k_bbe(be128 *a, struct gf128mul_4k *t)
 {
 	u8 *ap = (u8 *)a;
 	be128 r[1];
 	int i = 0;

 	*r = t->t[ap[0]];
 	while (++i < 16) {
 		gf128mul_x8_bbe(r);
 		be128_xor(r, r, &t->t[ap[i]]);
 	}
 	*a = *r;
 }
 EXPORT_SYMBOL(gf128mul_4k_bbe);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Functions for multiplying elements of GF(2^128)");
	/* gf128mul.c - GF(2^128) multiplication functions
	*
	* Copyright (c) 2003, Dr Brian Gladman, Worcester, UK.
	* Copyright (c) 2006, Rik Snel <rsnel@cube.dyndns.org>
	*
	* Based on Dr Brian Gladman's (GPL'd) work published at
	* http://gladman.plushost.co.uk/oldsite/cryptography_technology/index.php
	* See the original copyright notice below.
	*
	* 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) 2003, Dr Brian Gladman, 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.
	---------------------------------------------------------------------------
	Issue 31/01/2006

	This file provides fast multiplication in GF(128) as required by several
	cryptographic authentication modes
	*/

	#include <crypto/gf128mul.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/slab.h>

	#define gf128mul_dat(q) { \
	q(0x00), q(0x01), q(0x02), q(0x03), q(0x04), q(0x05), q(0x06), q(0x07),\
	q(0x08), q(0x09), q(0x0a), q(0x0b), q(0x0c), q(0x0d), q(0x0e), q(0x0f),\
	q(0x10), q(0x11), q(0x12), q(0x13), q(0x14), q(0x15), q(0x16), q(0x17),\
	q(0x18), q(0x19), q(0x1a), q(0x1b), q(0x1c), q(0x1d), q(0x1e), q(0x1f),\
	q(0x20), q(0x21), q(0x22), q(0x23), q(0x24), q(0x25), q(0x26), q(0x27),\
	q(0x28), q(0x29), q(0x2a), q(0x2b), q(0x2c), q(0x2d), q(0x2e), q(0x2f),\
	q(0x30), q(0x31), q(0x32), q(0x33), q(0x34), q(0x35), q(0x36), q(0x37),\
	q(0x38), q(0x39), q(0x3a), q(0x3b), q(0x3c), q(0x3d), q(0x3e), q(0x3f),\
	q(0x40), q(0x41), q(0x42), q(0x43), q(0x44), q(0x45), q(0x46), q(0x47),\
	q(0x48), q(0x49), q(0x4a), q(0x4b), q(0x4c), q(0x4d), q(0x4e), q(0x4f),\
	q(0x50), q(0x51), q(0x52), q(0x53), q(0x54), q(0x55), q(0x56), q(0x57),\
	q(0x58), q(0x59), q(0x5a), q(0x5b), q(0x5c), q(0x5d), q(0x5e), q(0x5f),\
	q(0x60), q(0x61), q(0x62), q(0x63), q(0x64), q(0x65), q(0x66), q(0x67),\
	q(0x68), q(0x69), q(0x6a), q(0x6b), q(0x6c), q(0x6d), q(0x6e), q(0x6f),\
	q(0x70), q(0x71), q(0x72), q(0x73), q(0x74), q(0x75), q(0x76), q(0x77),\
	q(0x78), q(0x79), q(0x7a), q(0x7b), q(0x7c), q(0x7d), q(0x7e), q(0x7f),\
	q(0x80), q(0x81), q(0x82), q(0x83), q(0x84), q(0x85), q(0x86), q(0x87),\
	q(0x88), q(0x89), q(0x8a), q(0x8b), q(0x8c), q(0x8d), q(0x8e), q(0x8f),\
	q(0x90), q(0x91), q(0x92), q(0x93), q(0x94), q(0x95), q(0x96), q(0x97),\
	q(0x98), q(0x99), q(0x9a), q(0x9b), q(0x9c), q(0x9d), q(0x9e), q(0x9f),\
	q(0xa0), q(0xa1), q(0xa2), q(0xa3), q(0xa4), q(0xa5), q(0xa6), q(0xa7),\
	q(0xa8), q(0xa9), q(0xaa), q(0xab), q(0xac), q(0xad), q(0xae), q(0xaf),\
	q(0xb0), q(0xb1), q(0xb2), q(0xb3), q(0xb4), q(0xb5), q(0xb6), q(0xb7),\
	q(0xb8), q(0xb9), q(0xba), q(0xbb), q(0xbc), q(0xbd), q(0xbe), q(0xbf),\
	q(0xc0), q(0xc1), q(0xc2), q(0xc3), q(0xc4), q(0xc5), q(0xc6), q(0xc7),\
	q(0xc8), q(0xc9), q(0xca), q(0xcb), q(0xcc), q(0xcd), q(0xce), q(0xcf),\
	q(0xd0), q(0xd1), q(0xd2), q(0xd3), q(0xd4), q(0xd5), q(0xd6), q(0xd7),\
	q(0xd8), q(0xd9), q(0xda), q(0xdb), q(0xdc), q(0xdd), q(0xde), q(0xdf),\
	q(0xe0), q(0xe1), q(0xe2), q(0xe3), q(0xe4), q(0xe5), q(0xe6), q(0xe7),\
	q(0xe8), q(0xe9), q(0xea), q(0xeb), q(0xec), q(0xed), q(0xee), q(0xef),\
	q(0xf0), q(0xf1), q(0xf2), q(0xf3), q(0xf4), q(0xf5), q(0xf6), q(0xf7),\
	q(0xf8), q(0xf9), q(0xfa), q(0xfb), q(0xfc), q(0xfd), q(0xfe), q(0xff) \
	}

	/* Given the value i in 0..255 as the byte overflow when a field element
	in GHASH is multiplied by x^8, this function will return the values that
	are generated in the lo 16-bit word of the field value by applying the
	modular polynomial. The values lo_byte and hi_byte are returned via the
	macro xp_fun(lo_byte, hi_byte) so that the values can be assembled into
	memory as required by a suitable definition of this macro operating on
	the table above
	*/

	#define xx(p, q) 0x##p##q

	#define xda_bbe(i) ( \
	(i & 0x80 ? xx(43, 80) : 0) ^ (i & 0x40 ? xx(21, c0) : 0) ^ \
	(i & 0x20 ? xx(10, e0) : 0) ^ (i & 0x10 ? xx(08, 70) : 0) ^ \
	(i & 0x08 ? xx(04, 38) : 0) ^ (i & 0x04 ? xx(02, 1c) : 0) ^ \
	(i & 0x02 ? xx(01, 0e) : 0) ^ (i & 0x01 ? xx(00, 87) : 0) \
	)

	#define xda_lle(i) ( \
	(i & 0x80 ? xx(e1, 00) : 0) ^ (i & 0x40 ? xx(70, 80) : 0) ^ \
	(i & 0x20 ? xx(38, 40) : 0) ^ (i & 0x10 ? xx(1c, 20) : 0) ^ \
	(i & 0x08 ? xx(0e, 10) : 0) ^ (i & 0x04 ? xx(07, 08) : 0) ^ \
	(i & 0x02 ? xx(03, 84) : 0) ^ (i & 0x01 ? xx(01, c2) : 0) \
	)

	static const u16 gf128mul_table_lle[256] = gf128mul_dat(xda_lle);
	static const u16 gf128mul_table_bbe[256] = gf128mul_dat(xda_bbe);

	/* These functions multiply a field element by x, by x^4 and by x^8
	* in the polynomial field representation. It uses 32-bit word operations
	* to gain speed but compensates for machine endianess and hence works
	* correctly on both styles of machine.
	*/

	static void gf128mul_x_lle(be128 r, const be128 x)
	{
	u64 a = be64_to_cpu(x->a);
	u64 b = be64_to_cpu(x->b);
	u64 _tt = gf128mul_table_lle[(b << 7) & 0xff];

	r->b = cpu_to_be64((b >> 1) \| (a << 63));
	r->a = cpu_to_be64((a >> 1) ^ (_tt << 48));
	}

	static void gf128mul_x_bbe(be128 r, const be128 x)
	{
	u64 a = be64_to_cpu(x->a);
	u64 b = be64_to_cpu(x->b);
	u64 _tt = gf128mul_table_bbe[a >> 63];

	r->a = cpu_to_be64((a << 1) \| (b >> 63));
	r->b = cpu_to_be64((b << 1) ^ _tt);
	}

	void gf128mul_x_ble(be128 r, const be128 x)
	{
	u64 a = le64_to_cpu(x->a);
	u64 b = le64_to_cpu(x->b);
	u64 _tt = gf128mul_table_bbe[b >> 63];

	r->a = cpu_to_le64((a << 1) ^ _tt);
	r->b = cpu_to_le64((b << 1) \| (a >> 63));
	}
	EXPORT_SYMBOL(gf128mul_x_ble);

	static void gf128mul_x8_lle(be128 *x)
	{
	u64 a = be64_to_cpu(x->a);
	u64 b = be64_to_cpu(x->b);
	u64 _tt = gf128mul_table_lle[b & 0xff];

	x->b = cpu_to_be64((b >> 8) \| (a << 56));
	x->a = cpu_to_be64((a >> 8) ^ (_tt << 48));
	}

	static void gf128mul_x8_bbe(be128 *x)
	{
	u64 a = be64_to_cpu(x->a);
	u64 b = be64_to_cpu(x->b);
	u64 _tt = gf128mul_table_bbe[a >> 56];

	x->a = cpu_to_be64((a << 8) \| (b >> 56));
	x->b = cpu_to_be64((b << 8) ^ _tt);
	}

	void gf128mul_lle(be128 r, const be128 b)
	{
	be128 p[8];
	int i;

	p[0] = *r;
	for (i = 0; i < 7; ++i)
	gf128mul_x_lle(&p[i + 1], &p[i]);

	memset(r, 0, sizeof(*r));
	for (i = 0;;) {
	u8 ch = ((u8 *)b)[15 - i];

	if (ch & 0x80)
	be128_xor(r, r, &p[0]);
	if (ch & 0x40)
	be128_xor(r, r, &p[1]);
	if (ch & 0x20)
	be128_xor(r, r, &p[2]);
	if (ch & 0x10)
	be128_xor(r, r, &p[3]);
	if (ch & 0x08)
	be128_xor(r, r, &p[4]);
	if (ch & 0x04)
	be128_xor(r, r, &p[5]);
	if (ch & 0x02)
	be128_xor(r, r, &p[6]);
	if (ch & 0x01)
	be128_xor(r, r, &p[7]);

	if (++i >= 16)
	break;

	gf128mul_x8_lle(r);
	}
	}
	EXPORT_SYMBOL(gf128mul_lle);

	void gf128mul_bbe(be128 r, const be128 b)
	{
	be128 p[8];
	int i;

	p[0] = *r;
	for (i = 0; i < 7; ++i)
	gf128mul_x_bbe(&p[i + 1], &p[i]);

	memset(r, 0, sizeof(*r));
	for (i = 0;;) {
	u8 ch = ((u8 *)b)[i];

	if (ch & 0x80)
	be128_xor(r, r, &p[7]);
	if (ch & 0x40)
	be128_xor(r, r, &p[6]);
	if (ch & 0x20)
	be128_xor(r, r, &p[5]);
	if (ch & 0x10)
	be128_xor(r, r, &p[4]);
	if (ch & 0x08)
	be128_xor(r, r, &p[3]);
	if (ch & 0x04)
	be128_xor(r, r, &p[2]);
	if (ch & 0x02)
	be128_xor(r, r, &p[1]);
	if (ch & 0x01)
	be128_xor(r, r, &p[0]);

	if (++i >= 16)
	break;

	gf128mul_x8_bbe(r);
	}
	}
	EXPORT_SYMBOL(gf128mul_bbe);

	/* This version uses 64k bytes of table space.
	A 16 byte buffer has to be multiplied by a 16 byte key
	value in GF(128). If we consider a GF(128) value in
	the buffer's lowest byte, we can construct a table of
	the 256 16 byte values that result from the 256 values
	of this byte. This requires 4096 bytes. But we also
	need tables for each of the 16 higher bytes in the
	buffer as well, which makes 64 kbytes in total.
	*/
	/* additional explanation
	* t[0][BYTE] contains g*BYTE
	* t[1][BYTE] contains gx^8BYTE
	* ..
	* t[15][BYTE] contains gx^120BYTE */
	struct gf128mul_64k gf128mul_init_64k_bbe(const be128 g)
	{
	struct gf128mul_64k *t;
	int i, j, k;

	t = kzalloc(sizeof(*t), GFP_KERNEL);
	if (!t)
	goto out;

	for (i = 0; i < 16; i++) {
	t->t[i] = kzalloc(sizeof(*t->t[i]), GFP_KERNEL);
	if (!t->t[i]) {
	gf128mul_free_64k(t);
	t = NULL;
	goto out;
	}
	}

	t->t[0]->t[1] = *g;
	for (j = 1; j <= 64; j <<= 1)
	gf128mul_x_bbe(&t->t[0]->t[j + j], &t->t[0]->t[j]);

	for (i = 0;;) {
	for (j = 2; j < 256; j += j)
	for (k = 1; k < j; ++k)
	be128_xor(&t->t[i]->t[j + k],
	&t->t[i]->t[j], &t->t[i]->t[k]);

	if (++i >= 16)
	break;

	for (j = 128; j > 0; j >>= 1) {
	t->t[i]->t[j] = t->t[i - 1]->t[j];
	gf128mul_x8_bbe(&t->t[i]->t[j]);
	}
	}

	out:
	return t;
	}
	EXPORT_SYMBOL(gf128mul_init_64k_bbe);

	void gf128mul_free_64k(struct gf128mul_64k *t)
	{
	int i;

	for (i = 0; i < 16; i++)
	kzfree(t->t[i]);
	kzfree(t);
	}
	EXPORT_SYMBOL(gf128mul_free_64k);

	void gf128mul_64k_bbe(be128 a, struct gf128mul_64k t)
	{
	u8 ap = (u8 )a;
	be128 r[1];
	int i;

	*r = t->t[0]->t[ap[15]];
	for (i = 1; i < 16; ++i)
	be128_xor(r, r, &t->t[i]->t[ap[15 - i]]);
	a = r;
	}
	EXPORT_SYMBOL(gf128mul_64k_bbe);

	/* This version uses 4k bytes of table space.
	A 16 byte buffer has to be multiplied by a 16 byte key
	value in GF(128). If we consider a GF(128) value in a
	single byte, we can construct a table of the 256 16 byte
	values that result from the 256 values of this byte.
	This requires 4096 bytes. If we take the highest byte in
	the buffer and use this table to get the result, we then
	have to multiply by x^120 to get the final value. For the
	next highest byte the result has to be multiplied by x^112
	and so on. But we can do this by accumulating the result
	in an accumulator starting with the result for the top
	byte. We repeatedly multiply the accumulator value by
	x^8 and then add in (i.e. xor) the 16 bytes of the next
	lower byte in the buffer, stopping when we reach the
	lowest byte. This requires a 4096 byte table.
	*/
	struct gf128mul_4k gf128mul_init_4k_lle(const be128 g)
	{
	struct gf128mul_4k *t;
	int j, k;

	t = kzalloc(sizeof(*t), GFP_KERNEL);
	if (!t)
	goto out;

	t->t[128] = *g;
	for (j = 64; j > 0; j >>= 1)
	gf128mul_x_lle(&t->t[j], &t->t[j+j]);

	for (j = 2; j < 256; j += j)
	for (k = 1; k < j; ++k)
	be128_xor(&t->t[j + k], &t->t[j], &t->t[k]);

	out:
	return t;
	}
	EXPORT_SYMBOL(gf128mul_init_4k_lle);

	struct gf128mul_4k gf128mul_init_4k_bbe(const be128 g)
	{
	struct gf128mul_4k *t;
	int j, k;

	t = kzalloc(sizeof(*t), GFP_KERNEL);
	if (!t)
	goto out;

	t->t[1] = *g;
	for (j = 1; j <= 64; j <<= 1)
	gf128mul_x_bbe(&t->t[j + j], &t->t[j]);

	for (j = 2; j < 256; j += j)
	for (k = 1; k < j; ++k)
	be128_xor(&t->t[j + k], &t->t[j], &t->t[k]);

	out:
	return t;
	}
	EXPORT_SYMBOL(gf128mul_init_4k_bbe);

	void gf128mul_4k_lle(be128 a, struct gf128mul_4k t)
	{
	u8 ap = (u8 )a;
	be128 r[1];
	int i = 15;

	*r = t->t[ap[15]];
	while (i--) {
	gf128mul_x8_lle(r);
	be128_xor(r, r, &t->t[ap[i]]);
	}
	a = r;
	}
	EXPORT_SYMBOL(gf128mul_4k_lle);

	void gf128mul_4k_bbe(be128 a, struct gf128mul_4k t)
	{
	u8 ap = (u8 )a;
	be128 r[1];
	int i = 0;

	*r = t->t[ap[0]];
	while (++i < 16) {
	gf128mul_x8_bbe(r);
	be128_xor(r, r, &t->t[ap[i]]);
	}
	a = r;
	}
	EXPORT_SYMBOL(gf128mul_4k_bbe);

	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Functions for multiplying elements of GF(2^128)");