335 lines
9.1 KiB
ArmAsm
335 lines
9.1 KiB
ArmAsm
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/***************************************************************************
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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-i586-asm.S"
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.text
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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/* return address at 0 */
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#define in_blk 12 /* input byte array address parameter*/
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#define out_blk 8 /* output byte array address parameter*/
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#define ctx 4 /* Twofish context structure */
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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 R0D %eax
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#define R0B %al
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#define R0H %ah
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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 R2D %ecx
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#define R2B %cl
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#define R2H %ch
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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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push d ## D;\
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movzx b ## B, %edi;\
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mov s1(%ebp,%edi,4),d ## D;\
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movzx a ## B, %edi;\
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mov s2(%ebp,%edi,4),%esi;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor s2(%ebp,%edi,4),d ## D;\
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movzx a ## H, %edi;\
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ror $16, a ## D;\
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xor s3(%ebp,%edi,4),%esi;\
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movzx b ## B, %edi;\
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xor s3(%ebp,%edi,4),d ## D;\
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movzx a ## B, %edi;\
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xor (%ebp,%edi,4), %esi;\
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movzx b ## H, %edi;\
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ror $15, b ## D;\
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xor (%ebp,%edi,4), d ## D;\
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movzx a ## H, %edi;\
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xor s1(%ebp,%edi,4),%esi;\
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pop %edi;\
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add d ## D, %esi;\
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add %esi, d ## D;\
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add k+round(%ebp), %esi;\
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xor %esi, c ## D;\
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rol $15, c ## D;\
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add k+4+round(%ebp),d ## D;\
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xor %edi, 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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* last round has different rotations for the output preparation
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*/
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#define encrypt_last_round(a,b,c,d,round)\
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push d ## D;\
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movzx b ## B, %edi;\
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mov s1(%ebp,%edi,4),d ## D;\
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movzx a ## B, %edi;\
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mov s2(%ebp,%edi,4),%esi;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor s2(%ebp,%edi,4),d ## D;\
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movzx a ## H, %edi;\
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ror $16, a ## D;\
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xor s3(%ebp,%edi,4),%esi;\
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movzx b ## B, %edi;\
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xor s3(%ebp,%edi,4),d ## D;\
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movzx a ## B, %edi;\
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xor (%ebp,%edi,4), %esi;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor (%ebp,%edi,4), d ## D;\
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movzx a ## H, %edi;\
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xor s1(%ebp,%edi,4),%esi;\
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pop %edi;\
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add d ## D, %esi;\
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add %esi, d ## D;\
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add k+round(%ebp), %esi;\
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xor %esi, c ## D;\
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ror $1, c ## D;\
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add k+4+round(%ebp),d ## D;\
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xor %edi, 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
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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 decrypt_round(a,b,c,d,round)\
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push c ## D;\
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movzx a ## B, %edi;\
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mov (%ebp,%edi,4), c ## D;\
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movzx b ## B, %edi;\
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mov s3(%ebp,%edi,4),%esi;\
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movzx a ## H, %edi;\
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ror $16, a ## D;\
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xor s1(%ebp,%edi,4),c ## D;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor (%ebp,%edi,4), %esi;\
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movzx a ## B, %edi;\
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xor s2(%ebp,%edi,4),c ## D;\
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movzx b ## B, %edi;\
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xor s1(%ebp,%edi,4),%esi;\
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movzx a ## H, %edi;\
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ror $15, a ## D;\
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xor s3(%ebp,%edi,4),c ## D;\
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movzx b ## H, %edi;\
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xor s2(%ebp,%edi,4),%esi;\
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pop %edi;\
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add %esi, c ## D;\
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add c ## D, %esi;\
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add k+round(%ebp), c ## D;\
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xor %edi, c ## D;\
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add k+4+round(%ebp),%esi;\
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xor %esi, 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 (rotated 16)
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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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* last round has different rotations for the output preparation
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*/
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#define decrypt_last_round(a,b,c,d,round)\
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push c ## D;\
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movzx a ## B, %edi;\
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mov (%ebp,%edi,4), c ## D;\
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movzx b ## B, %edi;\
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mov s3(%ebp,%edi,4),%esi;\
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movzx a ## H, %edi;\
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ror $16, a ## D;\
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xor s1(%ebp,%edi,4),c ## D;\
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movzx b ## H, %edi;\
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ror $16, b ## D;\
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xor (%ebp,%edi,4), %esi;\
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movzx a ## B, %edi;\
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xor s2(%ebp,%edi,4),c ## D;\
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movzx b ## B, %edi;\
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xor s1(%ebp,%edi,4),%esi;\
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movzx a ## H, %edi;\
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ror $16, a ## D;\
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xor s3(%ebp,%edi,4),c ## D;\
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movzx b ## H, %edi;\
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xor s2(%ebp,%edi,4),%esi;\
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pop %edi;\
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add %esi, c ## D;\
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add c ## D, %esi;\
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add k+round(%ebp), c ## D;\
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xor %edi, c ## D;\
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add k+4+round(%ebp),%esi;\
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xor %esi, d ## D;\
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ror $1, d ## D;
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ENTRY(twofish_enc_blk)
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push %ebp /* save registers according to calling convention*/
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push %ebx
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push %esi
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push %edi
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mov ctx + 16(%esp), %ebp /* abuse the base pointer: set new base
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* pointer to the ctx address */
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mov in_blk+16(%esp),%edi /* input address in edi */
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mov (%edi), %eax
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mov b_offset(%edi), %ebx
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mov c_offset(%edi), %ecx
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mov d_offset(%edi), %edx
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input_whitening(%eax,%ebp,a_offset)
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ror $16, %eax
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input_whitening(%ebx,%ebp,b_offset)
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input_whitening(%ecx,%ebp,c_offset)
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input_whitening(%edx,%ebp,d_offset)
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rol $1, %edx
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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(%eax,%ebp,c_offset)
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output_whitening(%ebx,%ebp,d_offset)
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output_whitening(%ecx,%ebp,a_offset)
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output_whitening(%edx,%ebp,b_offset)
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mov out_blk+16(%esp),%edi;
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mov %eax, c_offset(%edi)
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mov %ebx, d_offset(%edi)
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mov %ecx, (%edi)
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mov %edx, b_offset(%edi)
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pop %edi
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pop %esi
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pop %ebx
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pop %ebp
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mov $1, %eax
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ret
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ENDPROC(twofish_enc_blk)
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ENTRY(twofish_dec_blk)
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push %ebp /* save registers according to calling convention*/
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push %ebx
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push %esi
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push %edi
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mov ctx + 16(%esp), %ebp /* abuse the base pointer: set new base
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* pointer to the ctx address */
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mov in_blk+16(%esp),%edi /* input address in edi */
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mov (%edi), %eax
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mov b_offset(%edi), %ebx
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mov c_offset(%edi), %ecx
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mov d_offset(%edi), %edx
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output_whitening(%eax,%ebp,a_offset)
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output_whitening(%ebx,%ebp,b_offset)
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ror $16, %ebx
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output_whitening(%ecx,%ebp,c_offset)
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output_whitening(%edx,%ebp,d_offset)
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rol $1, %ecx
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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(%eax,%ebp,c_offset)
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input_whitening(%ebx,%ebp,d_offset)
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input_whitening(%ecx,%ebp,a_offset)
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input_whitening(%edx,%ebp,b_offset)
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mov out_blk+16(%esp),%edi;
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mov %eax, c_offset(%edi)
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mov %ebx, d_offset(%edi)
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mov %ecx, (%edi)
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mov %edx, b_offset(%edi)
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pop %edi
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pop %esi
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pop %ebx
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pop %ebp
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mov $1, %eax
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ret
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ENDPROC(twofish_dec_blk)
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