--- /dev/null
+/***************************************************************************
+* 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-x86_64-asm.S"
+.text
+
+#include <asm/asm-offsets.h>
+
+#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 R0 %rax
+#define R0D %eax
+#define R0B %al
+#define R0H %ah
+
+#define R1 %rbx
+#define R1D %ebx
+#define R1B %bl
+#define R1H %bh
+
+#define R2 %rcx
+#define R2D %ecx
+#define R2B %cl
+#define R2H %ch
+
+#define R3 %rdx
+#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)\
+ movzx b ## B, %edi;\
+ mov s1(%r11,%rdi,4),%r8d;\
+ movzx a ## B, %edi;\
+ mov s2(%r11,%rdi,4),%r9d;\
+ movzx b ## H, %edi;\
+ ror $16, b ## D;\
+ xor s2(%r11,%rdi,4),%r8d;\
+ movzx a ## H, %edi;\
+ ror $16, a ## D;\
+ xor s3(%r11,%rdi,4),%r9d;\
+ movzx b ## B, %edi;\
+ xor s3(%r11,%rdi,4),%r8d;\
+ movzx a ## B, %edi;\
+ xor (%r11,%rdi,4), %r9d;\
+ movzx b ## H, %edi;\
+ ror $15, b ## D;\
+ xor (%r11,%rdi,4), %r8d;\
+ movzx a ## H, %edi;\
+ xor s1(%r11,%rdi,4),%r9d;\
+ add %r8d, %r9d;\
+ add %r9d, %r8d;\
+ add k+round(%r11), %r9d;\
+ xor %r9d, c ## D;\
+ rol $15, c ## D;\
+ add k+4+round(%r11),%r8d;\
+ xor %r8d, 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
+ * during the round a and b are prepared for the output whitening
+ */
+#define encrypt_last_round(a,b,c,d,round)\
+ mov b ## D, %r10d;\
+ shl $32, %r10;\
+ movzx b ## B, %edi;\
+ mov s1(%r11,%rdi,4),%r8d;\
+ movzx a ## B, %edi;\
+ mov s2(%r11,%rdi,4),%r9d;\
+ movzx b ## H, %edi;\
+ ror $16, b ## D;\
+ xor s2(%r11,%rdi,4),%r8d;\
+ movzx a ## H, %edi;\
+ ror $16, a ## D;\
+ xor s3(%r11,%rdi,4),%r9d;\
+ movzx b ## B, %edi;\
+ xor s3(%r11,%rdi,4),%r8d;\
+ movzx a ## B, %edi;\
+ xor (%r11,%rdi,4), %r9d;\
+ xor a, %r10;\
+ movzx b ## H, %edi;\
+ xor (%r11,%rdi,4), %r8d;\
+ movzx a ## H, %edi;\
+ xor s1(%r11,%rdi,4),%r9d;\
+ add %r8d, %r9d;\
+ add %r9d, %r8d;\
+ add k+round(%r11), %r9d;\
+ xor %r9d, c ## D;\
+ ror $1, c ## D;\
+ add k+4+round(%r11),%r8d;\
+ xor %r8d, d ## D
+
+/*
+ * a input register containing a
+ * b input register containing b (rotated 16)
+ * c input register containing c (already rol $1)
+ * d input register containing d
+ * operations on a and b are interleaved to increase performance
+ */
+#define decrypt_round(a,b,c,d,round)\
+ movzx a ## B, %edi;\
+ mov (%r11,%rdi,4), %r9d;\
+ movzx b ## B, %edi;\
+ mov s3(%r11,%rdi,4),%r8d;\
+ movzx a ## H, %edi;\
+ ror $16, a ## D;\
+ xor s1(%r11,%rdi,4),%r9d;\
+ movzx b ## H, %edi;\
+ ror $16, b ## D;\
+ xor (%r11,%rdi,4), %r8d;\
+ movzx a ## B, %edi;\
+ xor s2(%r11,%rdi,4),%r9d;\
+ movzx b ## B, %edi;\
+ xor s1(%r11,%rdi,4),%r8d;\
+ movzx a ## H, %edi;\
+ ror $15, a ## D;\
+ xor s3(%r11,%rdi,4),%r9d;\
+ movzx b ## H, %edi;\
+ xor s2(%r11,%rdi,4),%r8d;\
+ add %r8d, %r9d;\
+ add %r9d, %r8d;\
+ add k+round(%r11), %r9d;\
+ xor %r9d, c ## D;\
+ add k+4+round(%r11),%r8d;\
+ xor %r8d, d ## D;\
+ rol $15, d ## D;
+
+/*
+ * a input register containing a
+ * b input register containing b
+ * c input register containing c (already rol $1)
+ * d input register containing d
+ * operations on a and b are interleaved to increase performance
+ * during the round a and b are prepared for the output whitening
+ */
+#define decrypt_last_round(a,b,c,d,round)\
+ movzx a ## B, %edi;\
+ mov (%r11,%rdi,4), %r9d;\
+ movzx b ## B, %edi;\
+ mov s3(%r11,%rdi,4),%r8d;\
+ movzx b ## H, %edi;\
+ ror $16, b ## D;\
+ xor (%r11,%rdi,4), %r8d;\
+ movzx a ## H, %edi;\
+ mov b ## D, %r10d;\
+ shl $32, %r10;\
+ xor a, %r10;\
+ ror $16, a ## D;\
+ xor s1(%r11,%rdi,4),%r9d;\
+ movzx b ## B, %edi;\
+ xor s1(%r11,%rdi,4),%r8d;\
+ movzx a ## B, %edi;\
+ xor s2(%r11,%rdi,4),%r9d;\
+ movzx b ## H, %edi;\
+ xor s2(%r11,%rdi,4),%r8d;\
+ movzx a ## H, %edi;\
+ xor s3(%r11,%rdi,4),%r9d;\
+ add %r8d, %r9d;\
+ add %r9d, %r8d;\
+ add k+round(%r11), %r9d;\
+ xor %r9d, c ## D;\
+ add k+4+round(%r11),%r8d;\
+ xor %r8d, d ## D;\
+ ror $1, d ## D;
+
+.align 8
+.global twofish_enc_blk
+.global twofish_dec_blk
+
+twofish_enc_blk:
+ pushq R1
+
+ /* %rdi contains the crypto tfm adress */
+ /* %rsi contains the output adress */
+ /* %rdx contains the input adress */
+ add $crypto_tfm_ctx_offset, %rdi /* set ctx adress */
+ /* ctx adress is moved to free one non-rex register
+ as target for the 8bit high operations */
+ mov %rdi, %r11
+
+ movq (R3), R1
+ movq 8(R3), R3
+ input_whitening(R1,%r11,a_offset)
+ input_whitening(R3,%r11,c_offset)
+ mov R1D, R0D
+ rol $16, R0D
+ shr $32, R1
+ mov R3D, R2D
+ shr $32, R3
+ rol $1, R3D
+
+ 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(%r10,%r11,a_offset)
+ movq %r10, (%rsi)
+
+ shl $32, R1
+ xor R0, R1
+
+ output_whitening(R1,%r11,c_offset)
+ movq R1, 8(%rsi)
+
+ popq R1
+ movq $1,%rax
+ ret
+
+twofish_dec_blk:
+ pushq R1
+
+ /* %rdi contains the crypto tfm adress */
+ /* %rsi contains the output adress */
+ /* %rdx contains the input adress */
+ add $crypto_tfm_ctx_offset, %rdi /* set ctx adress */
+ /* ctx adress is moved to free one non-rex register
+ as target for the 8bit high operations */
+ mov %rdi, %r11
+
+ movq (R3), R1
+ movq 8(R3), R3
+ output_whitening(R1,%r11,a_offset)
+ output_whitening(R3,%r11,c_offset)
+ mov R1D, R0D
+ shr $32, R1
+ rol $16, R1D
+ mov R3D, R2D
+ shr $32, R3
+ rol $1, R2D
+
+ 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(%r10,%r11,a_offset)
+ movq %r10, (%rsi)
+
+ shl $32, R1
+ xor R0, R1
+
+ input_whitening(R1,%r11,c_offset)
+ movq R1, 8(%rsi)
+
+ popq R1
+ movq $1,%rax
+ ret
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