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324 lines
8.4 KiB
324 lines
8.4 KiB
/***************************************************************************
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* Copyright (C) 2006 by Joachim Fritschi, <jfritschi@freenet.de> *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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.file "twofish-x86_64-asm.S"
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.text
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#include <asm/asm-offsets.h>
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#define a_offset 0
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#define b_offset 4
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#define c_offset 8
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#define d_offset 12
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/* Structure of the crypto context struct*/
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#define s0 0 /* S0 Array 256 Words each */
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#define s1 1024 /* S1 Array */
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#define s2 2048 /* S2 Array */
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#define s3 3072 /* S3 Array */
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#define w 4096 /* 8 whitening keys (word) */
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#define k 4128 /* key 1-32 ( word ) */
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/* define a few register aliases to allow macro substitution */
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#define R0 %rax
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#define R0D %eax
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#define R0B %al
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#define R0H %ah
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#define R1 %rbx
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#define R1D %ebx
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#define R1B %bl
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#define R1H %bh
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#define R2 %rcx
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#define R2D %ecx
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#define R2B %cl
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#define R2H %ch
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#define R3 %rdx
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#define R3D %edx
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#define R3B %dl
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#define R3H %dh
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/* performs input whitening */
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#define input_whitening(src,context,offset)\
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xor w+offset(context), src;
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/* performs input whitening */
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#define output_whitening(src,context,offset)\
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xor w+16+offset(context), src;
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/*
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* a input register containing a (rotated 16)
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* b input register containing b
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* c input register containing c
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* d input register containing d (already rol $1)
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* operations on a and b are interleaved to increase performance
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*/
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#define encrypt_round(a,b,c,d,round)\
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movzx b ## B, %edi;\
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mov s1(%r11,%rdi,4),%r8d;\
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movzx a ## B, %edi;\
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mov s2(%r11,%rdi,4),%r9d;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor s2(%r11,%rdi,4),%r8d;\
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movzx a ## H, %edi;\
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ror $16, a ## D;\
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xor s3(%r11,%rdi,4),%r9d;\
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movzx b ## B, %edi;\
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xor s3(%r11,%rdi,4),%r8d;\
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movzx a ## B, %edi;\
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xor (%r11,%rdi,4), %r9d;\
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movzx b ## H, %edi;\
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ror $15, b ## D;\
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xor (%r11,%rdi,4), %r8d;\
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movzx a ## H, %edi;\
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xor s1(%r11,%rdi,4),%r9d;\
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add %r8d, %r9d;\
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add %r9d, %r8d;\
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add k+round(%r11), %r9d;\
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xor %r9d, c ## D;\
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rol $15, c ## D;\
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add k+4+round(%r11),%r8d;\
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xor %r8d, d ## D;
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/*
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* a input register containing a(rotated 16)
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* b input register containing b
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* c input register containing c
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* d input register containing d (already rol $1)
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* operations on a and b are interleaved to increase performance
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* during the round a and b are prepared for the output whitening
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*/
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#define encrypt_last_round(a,b,c,d,round)\
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mov b ## D, %r10d;\
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shl $32, %r10;\
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movzx b ## B, %edi;\
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mov s1(%r11,%rdi,4),%r8d;\
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movzx a ## B, %edi;\
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mov s2(%r11,%rdi,4),%r9d;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor s2(%r11,%rdi,4),%r8d;\
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movzx a ## H, %edi;\
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ror $16, a ## D;\
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xor s3(%r11,%rdi,4),%r9d;\
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movzx b ## B, %edi;\
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xor s3(%r11,%rdi,4),%r8d;\
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movzx a ## B, %edi;\
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xor (%r11,%rdi,4), %r9d;\
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xor a, %r10;\
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movzx b ## H, %edi;\
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xor (%r11,%rdi,4), %r8d;\
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movzx a ## H, %edi;\
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xor s1(%r11,%rdi,4),%r9d;\
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add %r8d, %r9d;\
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add %r9d, %r8d;\
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add k+round(%r11), %r9d;\
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xor %r9d, c ## D;\
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ror $1, c ## D;\
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add k+4+round(%r11),%r8d;\
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xor %r8d, d ## D
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/*
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* a input register containing a
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* b input register containing b (rotated 16)
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* c input register containing c (already rol $1)
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* d input register containing d
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* operations on a and b are interleaved to increase performance
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*/
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#define decrypt_round(a,b,c,d,round)\
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movzx a ## B, %edi;\
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mov (%r11,%rdi,4), %r9d;\
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movzx b ## B, %edi;\
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mov s3(%r11,%rdi,4),%r8d;\
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movzx a ## H, %edi;\
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ror $16, a ## D;\
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xor s1(%r11,%rdi,4),%r9d;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor (%r11,%rdi,4), %r8d;\
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movzx a ## B, %edi;\
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xor s2(%r11,%rdi,4),%r9d;\
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movzx b ## B, %edi;\
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xor s1(%r11,%rdi,4),%r8d;\
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movzx a ## H, %edi;\
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ror $15, a ## D;\
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xor s3(%r11,%rdi,4),%r9d;\
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movzx b ## H, %edi;\
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xor s2(%r11,%rdi,4),%r8d;\
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add %r8d, %r9d;\
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add %r9d, %r8d;\
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add k+round(%r11), %r9d;\
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xor %r9d, c ## D;\
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add k+4+round(%r11),%r8d;\
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xor %r8d, d ## D;\
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rol $15, d ## D;
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/*
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* a input register containing a
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* b input register containing b
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* c input register containing c (already rol $1)
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* d input register containing d
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* operations on a and b are interleaved to increase performance
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* during the round a and b are prepared for the output whitening
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*/
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#define decrypt_last_round(a,b,c,d,round)\
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movzx a ## B, %edi;\
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mov (%r11,%rdi,4), %r9d;\
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movzx b ## B, %edi;\
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mov s3(%r11,%rdi,4),%r8d;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor (%r11,%rdi,4), %r8d;\
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movzx a ## H, %edi;\
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mov b ## D, %r10d;\
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shl $32, %r10;\
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xor a, %r10;\
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ror $16, a ## D;\
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xor s1(%r11,%rdi,4),%r9d;\
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movzx b ## B, %edi;\
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xor s1(%r11,%rdi,4),%r8d;\
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movzx a ## B, %edi;\
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xor s2(%r11,%rdi,4),%r9d;\
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movzx b ## H, %edi;\
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xor s2(%r11,%rdi,4),%r8d;\
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movzx a ## H, %edi;\
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xor s3(%r11,%rdi,4),%r9d;\
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add %r8d, %r9d;\
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add %r9d, %r8d;\
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add k+round(%r11), %r9d;\
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xor %r9d, c ## D;\
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add k+4+round(%r11),%r8d;\
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xor %r8d, d ## D;\
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ror $1, d ## D;
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.align 8
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.global twofish_enc_blk
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.global twofish_dec_blk
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twofish_enc_blk:
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pushq R1
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/* %rdi contains the crypto tfm adress */
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/* %rsi contains the output adress */
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/* %rdx contains the input adress */
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add $crypto_tfm_ctx_offset, %rdi /* set ctx adress */
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/* ctx adress is moved to free one non-rex register
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as target for the 8bit high operations */
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mov %rdi, %r11
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movq (R3), R1
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movq 8(R3), R3
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input_whitening(R1,%r11,a_offset)
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input_whitening(R3,%r11,c_offset)
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mov R1D, R0D
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rol $16, R0D
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shr $32, R1
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mov R3D, R2D
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shr $32, R3
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rol $1, R3D
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encrypt_round(R0,R1,R2,R3,0);
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encrypt_round(R2,R3,R0,R1,8);
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encrypt_round(R0,R1,R2,R3,2*8);
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encrypt_round(R2,R3,R0,R1,3*8);
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encrypt_round(R0,R1,R2,R3,4*8);
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encrypt_round(R2,R3,R0,R1,5*8);
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encrypt_round(R0,R1,R2,R3,6*8);
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encrypt_round(R2,R3,R0,R1,7*8);
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encrypt_round(R0,R1,R2,R3,8*8);
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encrypt_round(R2,R3,R0,R1,9*8);
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encrypt_round(R0,R1,R2,R3,10*8);
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encrypt_round(R2,R3,R0,R1,11*8);
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encrypt_round(R0,R1,R2,R3,12*8);
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encrypt_round(R2,R3,R0,R1,13*8);
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encrypt_round(R0,R1,R2,R3,14*8);
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encrypt_last_round(R2,R3,R0,R1,15*8);
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output_whitening(%r10,%r11,a_offset)
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movq %r10, (%rsi)
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shl $32, R1
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xor R0, R1
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output_whitening(R1,%r11,c_offset)
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movq R1, 8(%rsi)
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popq R1
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movq $1,%rax
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ret
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twofish_dec_blk:
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pushq R1
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/* %rdi contains the crypto tfm adress */
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/* %rsi contains the output adress */
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/* %rdx contains the input adress */
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add $crypto_tfm_ctx_offset, %rdi /* set ctx adress */
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/* ctx adress is moved to free one non-rex register
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as target for the 8bit high operations */
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mov %rdi, %r11
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movq (R3), R1
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movq 8(R3), R3
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output_whitening(R1,%r11,a_offset)
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output_whitening(R3,%r11,c_offset)
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mov R1D, R0D
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shr $32, R1
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rol $16, R1D
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mov R3D, R2D
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shr $32, R3
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rol $1, R2D
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decrypt_round(R0,R1,R2,R3,15*8);
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decrypt_round(R2,R3,R0,R1,14*8);
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decrypt_round(R0,R1,R2,R3,13*8);
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decrypt_round(R2,R3,R0,R1,12*8);
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decrypt_round(R0,R1,R2,R3,11*8);
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decrypt_round(R2,R3,R0,R1,10*8);
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decrypt_round(R0,R1,R2,R3,9*8);
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decrypt_round(R2,R3,R0,R1,8*8);
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decrypt_round(R0,R1,R2,R3,7*8);
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decrypt_round(R2,R3,R0,R1,6*8);
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decrypt_round(R0,R1,R2,R3,5*8);
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decrypt_round(R2,R3,R0,R1,4*8);
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decrypt_round(R0,R1,R2,R3,3*8);
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decrypt_round(R2,R3,R0,R1,2*8);
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decrypt_round(R0,R1,R2,R3,1*8);
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decrypt_last_round(R2,R3,R0,R1,0);
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input_whitening(%r10,%r11,a_offset)
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movq %r10, (%rsi)
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shl $32, R1
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xor R0, R1
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input_whitening(R1,%r11,c_offset)
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movq R1, 8(%rsi)
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popq R1
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movq $1,%rax
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ret
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