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Commit 6bbd9b6d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 

* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (64 commits)
  [BLOCK] dm-crypt: trivial comment improvements
  [CRYPTO] api: Deprecate crypto_digest_* and crypto_alg_available
  [CRYPTO] padlock: Convert padlock-sha to use crypto_hash
  [CRYPTO] users: Use crypto_comp and crypto_has_*
  [CRYPTO] api: Add crypto_comp and crypto_has_*
  [CRYPTO] users: Use crypto_hash interface instead of crypto_digest
  [SCSI] iscsi: Use crypto_hash interface instead of crypto_digest
  [CRYPTO] digest: Remove old HMAC implementation
  [CRYPTO] doc: Update documentation for hash and me
  [SCTP]: Use HMAC template and hash interface
  [IPSEC]: Use HMAC template and hash interface
  [CRYPTO] tcrypt: Use HMAC template and hash interface
  [CRYPTO] hmac: Add crypto template implementation
  [CRYPTO] digest: Added user API for new hash type
  [CRYPTO] api: Mark parts of cipher interface as deprecated
  [PATCH] scatterlist: Add const to sg_set_buf/sg_init_one pointer argument
  [CRYPTO] drivers: Remove obsolete block cipher operations
  [CRYPTO] users: Use block ciphers where applicable
  [SUNRPC] GSS: Use block ciphers where applicable
  [IPSEC] ESP: Use block ciphers where applicable
  ...
parents a489d159 3c164bd8

Documentation/crypto/api-intro.txt

+22 −14
Original line number Diff line number Diff line
@@ -19,15 +19,14 @@ At the lowest level are algorithms, which register dynamically with the 
API.



'Transforms' are user-instantiated objects, which maintain state, handle all

of the implementation logic (e.g. manipulating page vectors), provide an 

abstraction to the underlying algorithms, and handle common logical 

operations (e.g. cipher modes, HMAC for digests).  However, at the user 

of the implementation logic (e.g. manipulating page vectors) and provide an 

abstraction to the underlying algorithms.  However, at the user 

level they are very simple.



Conceptually, the API layering looks like this:



  [transform api]  (user interface)

  [transform ops]  (per-type logic glue e.g. cipher.c, digest.c)

  [transform ops]  (per-type logic glue e.g. cipher.c, compress.c)

  [algorithm api]  (for registering algorithms)

  

The idea is to make the user interface and algorithm registration API
@@ -44,22 +43,27 @@ under development. 
Here's an example of how to use the API:



	#include <linux/crypto.h>

	#include <linux/err.h>

	#include <linux/scatterlist.h>

	

	struct scatterlist sg[2];

	char result[128];

	struct crypto_tfm *tfm;

	struct crypto_hash *tfm;

	struct hash_desc desc;

	

	tfm = crypto_alloc_tfm("md5", 0);

	if (tfm == NULL)

	tfm = crypto_alloc_hash("md5", 0, CRYPTO_ALG_ASYNC);

	if (IS_ERR(tfm))

		fail();

		

	/* ... set up the scatterlists ... */



	crypto_digest_init(tfm);

	crypto_digest_update(tfm, &sg, 2);

	crypto_digest_final(tfm, result);

	desc.tfm = tfm;

	desc.flags = 0;

	

	crypto_free_tfm(tfm);

	if (crypto_hash_digest(&desc, &sg, 2, result))

		fail();

	

	crypto_free_hash(tfm);



    

Many real examples are available in the regression test module (tcrypt.c).
@@ -126,7 +130,7 @@ might already be working on. 
BUGS



Send bug reports to:

James Morris <jmorris@redhat.com>

Herbert Xu <herbert@gondor.apana.org.au>

Cc: David S. Miller <davem@redhat.com>
@@ -134,13 +138,14 @@ FURTHER INFORMATION 


For further patches and various updates, including the current TODO

list, see:

http://samba.org/~jamesm/crypto/

http://gondor.apana.org.au/~herbert/crypto/





AUTHORS



James Morris

David S. Miller

Herbert Xu





CREDITS
@@ -238,8 +243,11 @@ Anubis algorithm contributors: 
Tiger algorithm contributors:

  Aaron Grothe



VIA PadLock contributors:

  Michal Ludvig



Generic scatterwalk code by Adam J. Richter <adam@yggdrasil.com>



Please send any credits updates or corrections to:

James Morris <jmorris@redhat.com>

Herbert Xu <herbert@gondor.apana.org.au>

arch/i386/crypto/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -5,5 +5,8 @@ 
# 



obj-$(CONFIG_CRYPTO_AES_586) += aes-i586.o

obj-$(CONFIG_CRYPTO_TWOFISH_586) += twofish-i586.o



aes-i586-y := aes-i586-asm.o aes.o

twofish-i586-y := twofish-i586-asm.o twofish.o

arch/i386/crypto/aes.c

+2 −1
Original line number Diff line number Diff line
@@ -379,12 +379,13 @@ static void gen_tabs(void) 
}



static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,

		       unsigned int key_len, u32 *flags)

		       unsigned int key_len)

{

	int i;

	u32 ss[8];

	struct aes_ctx *ctx = crypto_tfm_ctx(tfm);

	const __le32 *key = (const __le32 *)in_key;

	u32 *flags = &tfm->crt_flags;



	/* encryption schedule */

arch/i386/crypto/twofish-i586-asm.S

0 → 100644
+335 −0
Original line number Diff line number Diff line 
/***************************************************************************

*   Copyright (C) 2006 by Joachim Fritschi, <jfritschi@freenet.de>        *

*                                                                         *

*   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.                                   *

*                                                                         *

*   This program is distributed in the hope that it will be useful,       *

*   but WITHOUT ANY WARRANTY; without even the implied warranty of        *

*   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *

*   GNU General Public License for more details.                          *

*                                                                         *

*   You should have received a copy of the GNU General Public License     *

*   along with this program; if not, write to the                         *

*   Free Software Foundation, Inc.,                                       *

*   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *

***************************************************************************/



.file "twofish-i586-asm.S"

.text



#include <asm/asm-offsets.h>



/* return adress at 0 */



#define in_blk    12  /* input byte array address parameter*/

#define out_blk   8  /* output byte array address parameter*/

#define tfm       4  /* Twofish context structure */



#define a_offset	0

#define b_offset	4

#define c_offset	8

#define d_offset	12



/* Structure of the crypto context struct*/



#define s0	0	/* S0 Array 256 Words each */

#define s1	1024	/* S1 Array */

#define s2	2048	/* S2 Array */

#define s3	3072	/* S3 Array */

#define w	4096	/* 8 whitening keys (word) */

#define k	4128	/* key 1-32 ( word ) */



/* define a few register aliases to allow macro substitution */



#define R0D    %eax

#define R0B    %al

#define R0H    %ah



#define R1D    %ebx

#define R1B    %bl

#define R1H    %bh



#define R2D    %ecx

#define R2B    %cl

#define R2H    %ch



#define R3D    %edx

#define R3B    %dl

#define R3H    %dh





/* performs input whitening */

#define input_whitening(src,context,offset)\

	xor	w+offset(context),	src;



/* performs input whitening */

#define output_whitening(src,context,offset)\

	xor	w+16+offset(context),	src;



/*

 * a input register containing a (rotated 16)

 * b input register containing b

 * c input register containing c

 * d input register containing d (already rol $1)

 * operations on a and b are interleaved to increase performance

 */

#define encrypt_round(a,b,c,d,round)\

	push	d ## D;\

	movzx	b ## B,		%edi;\

	mov	s1(%ebp,%edi,4),d ## D;\

	movzx	a ## B,		%edi;\

	mov	s2(%ebp,%edi,4),%esi;\

	movzx	b ## H,		%edi;\

	ror	$16,		b ## D;\

	xor	s2(%ebp,%edi,4),d ## D;\

	movzx	a ## H,		%edi;\

	ror	$16,		a ## D;\

	xor	s3(%ebp,%edi,4),%esi;\

	movzx	b ## B,		%edi;\

	xor	s3(%ebp,%edi,4),d ## D;\

	movzx	a ## B,		%edi;\

	xor	(%ebp,%edi,4),	%esi;\

	movzx	b ## H,		%edi;\

	ror	$15,		b ## D;\

	xor	(%ebp,%edi,4),	d ## D;\

	movzx	a ## H,		%edi;\

	xor	s1(%ebp,%edi,4),%esi;\

	pop	%edi;\

	add	d ## D,		%esi;\

	add	%esi,		d ## D;\

	add	k+round(%ebp),	%esi;\

	xor	%esi,		c ## D;\

	rol	$15,		c ## D;\

	add	k+4+round(%ebp),d ## D;\

	xor	%edi,		d ## D;



/*

 * a input register containing a (rotated 16)

 * b input register containing b

 * c input register containing c

 * d input register containing d (already rol $1)

 * operations on a and b are interleaved to increase performance

 * last round has different rotations for the output preparation

 */

#define encrypt_last_round(a,b,c,d,round)\

	push	d ## D;\

	movzx	b ## B,		%edi;\

	mov	s1(%ebp,%edi,4),d ## D;\

	movzx	a ## B,		%edi;\

	mov	s2(%ebp,%edi,4),%esi;\

	movzx	b ## H,		%edi;\

	ror	$16,		b ## D;\

	xor	s2(%ebp,%edi,4),d ## D;\

	movzx	a ## H,		%edi;\

	ror	$16,		a ## D;\

	xor	s3(%ebp,%edi,4),%esi;\

	movzx	b ## B,		%edi;\

	xor	s3(%ebp,%edi,4),d ## D;\

	movzx	a ## B,		%edi;\

	xor	(%ebp,%edi,4),	%esi;\

	movzx	b ## H,		%edi;\

	ror	$16,		b ## D;\

	xor	(%ebp,%edi,4),	d ## D;\

	movzx	a ## H,		%edi;\

	xor	s1(%ebp,%edi,4),%esi;\

	pop	%edi;\

	add	d ## D,		%esi;\

	add	%esi,		d ## D;\

	add	k+round(%ebp),	%esi;\

	xor	%esi,		c ## D;\

	ror	$1,		c ## D;\

	add	k+4+round(%ebp),d ## D;\

	xor	%edi,		d ## D;



/*

 * a input register containing a

 * b input register containing b (rotated 16)

 * c input register containing c

 * d input register containing d (already rol $1)

 * operations on a and b are interleaved to increase performance

 */

#define decrypt_round(a,b,c,d,round)\

	push	c ## D;\

	movzx	a ## B,		%edi;\

	mov	(%ebp,%edi,4),	c ## D;\

	movzx	b ## B,		%edi;\

	mov	s3(%ebp,%edi,4),%esi;\

	movzx	a ## H,		%edi;\

	ror	$16,		a ## D;\

	xor	s1(%ebp,%edi,4),c ## D;\

	movzx	b ## H,		%edi;\

	ror	$16,		b ## D;\

	xor	(%ebp,%edi,4),	%esi;\

	movzx	a ## B,		%edi;\

	xor	s2(%ebp,%edi,4),c ## D;\

	movzx	b ## B,		%edi;\

	xor	s1(%ebp,%edi,4),%esi;\

	movzx	a ## H,		%edi;\

	ror	$15,		a ## D;\

	xor	s3(%ebp,%edi,4),c ## D;\

	movzx	b ## H,		%edi;\

	xor	s2(%ebp,%edi,4),%esi;\

	pop	%edi;\

	add	%esi,		c ## D;\

	add	c ## D,		%esi;\

	add	k+round(%ebp),	c ## D;\

	xor	%edi,		c ## D;\

	add	k+4+round(%ebp),%esi;\

	xor	%esi,		d ## D;\

	rol	$15,		d ## D;



/*

 * a input register containing a

 * b input register containing b (rotated 16)

 * c input register containing c

 * d input register containing d (already rol $1)

 * operations on a and b are interleaved to increase performance

 * last round has different rotations for the output preparation

 */

#define decrypt_last_round(a,b,c,d,round)\

	push	c ## D;\

	movzx	a ## B,		%edi;\

	mov	(%ebp,%edi,4),	c ## D;\

	movzx	b ## B,		%edi;\

	mov	s3(%ebp,%edi,4),%esi;\

	movzx	a ## H,		%edi;\

	ror	$16,		a ## D;\

	xor	s1(%ebp,%edi,4),c ## D;\

	movzx	b ## H,		%edi;\

	ror	$16,		b ## D;\

	xor	(%ebp,%edi,4),	%esi;\

	movzx	a ## B,		%edi;\

	xor	s2(%ebp,%edi,4),c ## D;\

	movzx	b ## B,		%edi;\

	xor	s1(%ebp,%edi,4),%esi;\

	movzx	a ## H,		%edi;\

	ror	$16,		a ## D;\

	xor	s3(%ebp,%edi,4),c ## D;\

	movzx	b ## H,		%edi;\

	xor	s2(%ebp,%edi,4),%esi;\

	pop	%edi;\

	add	%esi,		c ## D;\

	add	c ## D,		%esi;\

	add	k+round(%ebp),	c ## D;\

	xor	%edi,		c ## D;\

	add	k+4+round(%ebp),%esi;\

	xor	%esi,		d ## D;\

	ror	$1,		d ## D;



.align 4

.global twofish_enc_blk

.global twofish_dec_blk



twofish_enc_blk:

	push	%ebp			/* save registers according to calling convention*/

	push    %ebx

	push    %esi

	push    %edi



	mov	tfm + 16(%esp),	%ebp	/* abuse the base pointer: set new base bointer to the crypto tfm */

	add	$crypto_tfm_ctx_offset, %ebp	/* ctx adress */

	mov     in_blk+16(%esp),%edi	/* input adress in edi */



	mov	(%edi),		%eax

	mov	b_offset(%edi),	%ebx

	mov	c_offset(%edi),	%ecx

	mov	d_offset(%edi),	%edx

	input_whitening(%eax,%ebp,a_offset)

	ror	$16,	%eax

	input_whitening(%ebx,%ebp,b_offset)

	input_whitening(%ecx,%ebp,c_offset)

	input_whitening(%edx,%ebp,d_offset)

	rol	$1,	%edx



	encrypt_round(R0,R1,R2,R3,0);

	encrypt_round(R2,R3,R0,R1,8);

	encrypt_round(R0,R1,R2,R3,2*8);

	encrypt_round(R2,R3,R0,R1,3*8);

	encrypt_round(R0,R1,R2,R3,4*8);

	encrypt_round(R2,R3,R0,R1,5*8);

	encrypt_round(R0,R1,R2,R3,6*8);

	encrypt_round(R2,R3,R0,R1,7*8);

	encrypt_round(R0,R1,R2,R3,8*8);

	encrypt_round(R2,R3,R0,R1,9*8);

	encrypt_round(R0,R1,R2,R3,10*8);

	encrypt_round(R2,R3,R0,R1,11*8);

	encrypt_round(R0,R1,R2,R3,12*8);

	encrypt_round(R2,R3,R0,R1,13*8);

	encrypt_round(R0,R1,R2,R3,14*8);

	encrypt_last_round(R2,R3,R0,R1,15*8);



	output_whitening(%eax,%ebp,c_offset)

	output_whitening(%ebx,%ebp,d_offset)

	output_whitening(%ecx,%ebp,a_offset)

	output_whitening(%edx,%ebp,b_offset)

	mov	out_blk+16(%esp),%edi;

	mov	%eax,		c_offset(%edi)

	mov	%ebx,		d_offset(%edi)

	mov	%ecx,		(%edi)

	mov	%edx,		b_offset(%edi)



	pop	%edi

	pop	%esi

	pop	%ebx

	pop	%ebp

	mov	$1,	%eax

	ret



twofish_dec_blk:

	push	%ebp			/* save registers according to calling convention*/

	push    %ebx

	push    %esi

	push    %edi





	mov	tfm + 16(%esp),	%ebp	/* abuse the base pointer: set new base bointer to the crypto tfm */

	add	$crypto_tfm_ctx_offset, %ebp	/* ctx adress */

	mov     in_blk+16(%esp),%edi	/* input adress in edi */



	mov	(%edi),		%eax

	mov	b_offset(%edi),	%ebx

	mov	c_offset(%edi),	%ecx

	mov	d_offset(%edi),	%edx

	output_whitening(%eax,%ebp,a_offset)

	output_whitening(%ebx,%ebp,b_offset)

	ror	$16,	%ebx

	output_whitening(%ecx,%ebp,c_offset)

	output_whitening(%edx,%ebp,d_offset)

	rol	$1,	%ecx



	decrypt_round(R0,R1,R2,R3,15*8);

	decrypt_round(R2,R3,R0,R1,14*8);

	decrypt_round(R0,R1,R2,R3,13*8);

	decrypt_round(R2,R3,R0,R1,12*8);

	decrypt_round(R0,R1,R2,R3,11*8);

	decrypt_round(R2,R3,R0,R1,10*8);

	decrypt_round(R0,R1,R2,R3,9*8);

	decrypt_round(R2,R3,R0,R1,8*8);

	decrypt_round(R0,R1,R2,R3,7*8);

	decrypt_round(R2,R3,R0,R1,6*8);

	decrypt_round(R0,R1,R2,R3,5*8);

	decrypt_round(R2,R3,R0,R1,4*8);

	decrypt_round(R0,R1,R2,R3,3*8);

	decrypt_round(R2,R3,R0,R1,2*8);

	decrypt_round(R0,R1,R2,R3,1*8);

	decrypt_last_round(R2,R3,R0,R1,0);



	input_whitening(%eax,%ebp,c_offset)

	input_whitening(%ebx,%ebp,d_offset)

	input_whitening(%ecx,%ebp,a_offset)

	input_whitening(%edx,%ebp,b_offset)

	mov	out_blk+16(%esp),%edi;

	mov	%eax,		c_offset(%edi)

	mov	%ebx,		d_offset(%edi)

	mov	%ecx,		(%edi)

	mov	%edx,		b_offset(%edi)



	pop	%edi

	pop	%esi

	pop	%ebx

	pop	%ebp

	mov	$1,	%eax

	ret

arch/i386/crypto/twofish.c

0 → 100644
+97 −0
Original line number Diff line number Diff line 
/*

 *  Glue Code for optimized 586 assembler version of TWOFISH

 *

 * Originally Twofish for GPG

 * By Matthew Skala <mskala@ansuz.sooke.bc.ca>, July 26, 1998

 * 256-bit key length added March 20, 1999

 * Some modifications to reduce the text size by Werner Koch, April, 1998

 * Ported to the kerneli patch by Marc Mutz <Marc@Mutz.com>

 * Ported to CryptoAPI by Colin Slater <hoho@tacomeat.net>

 *

 * The original author has disclaimed all copyright interest in this

 * code and thus put it in the public domain. The subsequent authors

 * have put this under the GNU General Public License.

 *

 * 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.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307

 * USA

 *

 * This code is a "clean room" implementation, written from the paper

 * _Twofish: A 128-Bit Block Cipher_ by Bruce Schneier, John Kelsey,

 * Doug Whiting, David Wagner, Chris Hall, and Niels Ferguson, available

 * through http://www.counterpane.com/twofish.html

 *

 * For background information on multiplication in finite fields, used for

 * the matrix operations in the key schedule, see the book _Contemporary

 * Abstract Algebra_ by Joseph A. Gallian, especially chapter 22 in the

 * Third Edition.

 */



#include <crypto/twofish.h>

#include <linux/crypto.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/types.h>





asmlinkage void twofish_enc_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);

asmlinkage void twofish_dec_blk(struct crypto_tfm *tfm, u8 *dst, const u8 *src);



static void twofish_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)

{

	twofish_enc_blk(tfm, dst, src);

}



static void twofish_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)

{

	twofish_dec_blk(tfm, dst, src);

}



static struct crypto_alg alg = {

	.cra_name		=	"twofish",

	.cra_driver_name	=	"twofish-i586",

	.cra_priority		=	200,

	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,

	.cra_blocksize		=	TF_BLOCK_SIZE,

	.cra_ctxsize		=	sizeof(struct twofish_ctx),

	.cra_alignmask		=	3,

	.cra_module		=	THIS_MODULE,

	.cra_list		=	LIST_HEAD_INIT(alg.cra_list),

	.cra_u			=	{

		.cipher = {

			.cia_min_keysize	=	TF_MIN_KEY_SIZE,

			.cia_max_keysize	=	TF_MAX_KEY_SIZE,

			.cia_setkey		=	twofish_setkey,

			.cia_encrypt		=	twofish_encrypt,

			.cia_decrypt		=	twofish_decrypt

		}

	}

};



static int __init init(void)

{

	return crypto_register_alg(&alg);

}



static void __exit fini(void)

{

	crypto_unregister_alg(&alg);

}



module_init(init);

module_exit(fini);



MODULE_LICENSE("GPL");

MODULE_DESCRIPTION ("Twofish Cipher Algorithm, i586 asm optimized");

MODULE_ALIAS("twofish");