178 lines
4.5 KiB
Perl
178 lines
4.5 KiB
Perl
#!/usr/local/bin/perl
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# define for pentium pro friendly version
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$ppro=1;
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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push(@INC,"${dir}","${dir}../../perlasm");
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require "x86asm.pl";
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require "cbc.pl";
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&asm_init($ARGV[0],"cast-586.pl",$ARGV[$#ARGV] eq "386");
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$CAST_ROUNDS=16;
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$L="edi";
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$R="esi";
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$K="ebp";
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$tmp1="ecx";
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$tmp2="ebx";
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$tmp3="eax";
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$tmp4="edx";
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$S1="CAST_S_table0";
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$S2="CAST_S_table1";
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$S3="CAST_S_table2";
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$S4="CAST_S_table3";
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@F1=("add","xor","sub");
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@F2=("xor","sub","add");
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@F3=("sub","add","xor");
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&CAST_encrypt("CAST_encrypt",1);
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&CAST_encrypt("CAST_decrypt",0);
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&cbc("CAST_cbc_encrypt","CAST_encrypt","CAST_decrypt",1,4,5,3,-1,-1);
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&asm_finish();
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sub CAST_encrypt {
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local($name,$enc)=@_;
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local($win_ex)=<<"EOF";
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EXTERN _CAST_S_table0:DWORD
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EXTERN _CAST_S_table1:DWORD
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EXTERN _CAST_S_table2:DWORD
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EXTERN _CAST_S_table3:DWORD
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EOF
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&main::external_label(
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"CAST_S_table0",
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"CAST_S_table1",
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"CAST_S_table2",
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"CAST_S_table3",
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);
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&function_begin_B($name,$win_ex);
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&comment("");
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&push("ebp");
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&push("ebx");
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&mov($tmp2,&wparam(0));
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&mov($K,&wparam(1));
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&push("esi");
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&push("edi");
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&comment("Load the 2 words");
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&mov($L,&DWP(0,$tmp2,"",0));
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&mov($R,&DWP(4,$tmp2,"",0));
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&comment('Get short key flag');
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&mov($tmp3,&DWP(128,$K,"",0));
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if($enc) {
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&push($tmp3);
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} else {
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&or($tmp3,$tmp3);
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&jnz(&label('cast_dec_skip'));
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}
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&xor($tmp3, $tmp3);
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# encrypting part
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if ($enc) {
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&E_CAST( 0,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 1,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 2,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 3,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 4,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 5,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 6,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 7,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 8,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 9,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(10,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(11,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&comment('test short key flag');
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&pop($tmp4);
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&or($tmp4,$tmp4);
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&jnz(&label('cast_enc_done'));
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&E_CAST(12,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(13,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(14,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(15,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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} else {
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&E_CAST(15,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(14,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(13,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(12,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&set_label('cast_dec_skip');
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&E_CAST(11,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST(10,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 9,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 8,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 7,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 6,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 5,$S,$L,$R,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 4,$S,$R,$L,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 3,$S,$L,$R,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 2,$S,$R,$L,$K,@F3,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 1,$S,$L,$R,$K,@F2,$tmp1,$tmp2,$tmp3,$tmp4);
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&E_CAST( 0,$S,$R,$L,$K,@F1,$tmp1,$tmp2,$tmp3,$tmp4);
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}
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&set_label('cast_enc_done') if $enc;
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# Why the nop? - Ben 17/1/99
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&nop();
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&mov($tmp3,&wparam(0));
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&mov(&DWP(4,$tmp3,"",0),$L);
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&mov(&DWP(0,$tmp3,"",0),$R);
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&function_end($name);
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}
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sub E_CAST {
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local($i,$S,$L,$R,$K,$OP1,$OP2,$OP3,$tmp1,$tmp2,$tmp3,$tmp4)=@_;
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# Ri needs to have 16 pre added.
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&comment("round $i");
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&mov( $tmp4, &DWP($i*8,$K,"",1));
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&mov( $tmp1, &DWP($i*8+4,$K,"",1));
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&$OP1( $tmp4, $R);
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&rotl( $tmp4, &LB($tmp1));
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if ($ppro) {
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&mov( $tmp2, $tmp4); # B
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&xor( $tmp1, $tmp1);
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&movb( &LB($tmp1), &HB($tmp4)); # A
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&and( $tmp2, 0xff);
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&shr( $tmp4, 16); #
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&xor( $tmp3, $tmp3);
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} else {
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&mov( $tmp2, $tmp4); # B
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&movb( &LB($tmp1), &HB($tmp4)); # A # BAD BAD BAD
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&shr( $tmp4, 16); #
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&and( $tmp2, 0xff);
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}
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&movb( &LB($tmp3), &HB($tmp4)); # C # BAD BAD BAD
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&and( $tmp4, 0xff); # D
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&mov( $tmp1, &DWP($S1,"",$tmp1,4));
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&mov( $tmp2, &DWP($S2,"",$tmp2,4));
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&$OP2( $tmp1, $tmp2);
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&mov( $tmp2, &DWP($S3,"",$tmp3,4));
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&$OP3( $tmp1, $tmp2);
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&mov( $tmp2, &DWP($S4,"",$tmp4,4));
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&$OP1( $tmp1, $tmp2);
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# XXX
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&xor( $L, $tmp1);
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# XXX
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}
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