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321 lines
8.2 KiB
321 lines
8.2 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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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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***************************************************************************/ |
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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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SYM_FUNC_START(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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SYM_FUNC_END(twofish_enc_blk) |
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SYM_FUNC_START(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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SYM_FUNC_END(twofish_dec_blk)
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