Re: [PATCH 3/4] Twofish cipher - i586 assembler
From: Joachim Fritschi
Date: Mon Jun 19 2006 - 10:12:26 EST
This patch is now based on the cryptodev tree using the new cryptoapi (crypto tfm
instead of the crypto ctx as parameter).
The module passed the tcrypt tests and testscripts.
Signed-off-by: Joachim Fritschi <jfritschi@xxxxxxxxxx>
arch/i386/crypto/Makefile | 3
arch/i386/crypto/twofish-i586-asm.S | 335 +++++++++++++++++++++++++++++++++++
arch/i386/crypto/twofish.c | 88 +++++++++
crypto/Kconfig | 15 ++
4 files changed, 441 insertions(+), 0 deletions(-)
diff --git a/arch/i386/crypto/Makefile b/arch/i386/crypto/Makefile
index 103c353..3fd19af 100644
--- a/arch/i386/crypto/Makefile
+++ b/arch/i386/crypto/Makefile
@@ -5,5 +5,8 @@ # Arch-specific CryptoAPI modules.
#
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
+
diff --git a/arch/i386/crypto/twofish-i586-asm.S b/arch/i386/crypto/twofish-i586-asm.S
new file mode 100644
index 0000000..0bae145
--- /dev/null
+++ b/arch/i386/crypto/twofish-i586-asm.S
@@ -0,0 +1,335 @@
+/***************************************************************************
+* Copyright (C) 2006 by Joachim Fritschi, <jfritschi@xxxxxxxxxx> *
+* *
+* 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
diff --git a/arch/i386/crypto/twofish.c b/arch/i386/crypto/twofish.c
new file mode 100644
index 0000000..084d14c
--- /dev/null
+++ b/arch/i386/crypto/twofish.c
@@ -0,0 +1,88 @@
+/*
+ * Glue Code for optimized 586 assembler version of TWOFISH
+ *
+ * Originally Twofish for GPG
+ * By Matthew Skala <mskala@xxxxxxxxxxxxxxxxx>, 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@xxxxxxxx>
+ * Ported to CryptoAPI by Colin Slater <hoho@xxxxxxxxxxxx>
+ *
+ * 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 <asm/byteorder.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/crypto.h>
+#include <linux/bitops.h>
+#include <crypto/twofish.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 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_enc_blk,
+ .cia_decrypt = twofish_dec_blk } }
+};
+
+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");
diff --git a/crypto/Kconfig b/crypto/Kconfig
index f364260..28b203b 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -150,6 +150,21 @@ config CRYPTO_TWOFISH_COMMON
Common parts of the Twofish cipher algorithm shared by the
generic c and the assembler implementations.
+config CRYPTO_TWOFISH_586
+ tristate "Twofish cipher algorithms (i586)"
+ depends on CRYPTO && ((X86 || UML_X86) && !64BIT)
+ select CRYPTO_TWOFISH_COMMON
+ help
+ Twofish cipher algorithm.
+
+ Twofish was submitted as an AES (Advanced Encryption Standard)
+ candidate cipher by researchers at CounterPane Systems. It is a
+ 16 round block cipher supporting key sizes of 128, 192, and 256
+ bits.
+
+ See also:
+ <http://www.schneier.com/twofish.html>
+
config CRYPTO_SERPENT
tristate "Serpent cipher algorithm"
depends on CRYPTO
-
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