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111 lines
2.0 KiB
111 lines
2.0 KiB
4 years ago
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#!/usr/local/bin/perl
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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],"rc5-586.pl");
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$RC5_MAX_ROUNDS=16;
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$RC5_32_OFF=($RC5_MAX_ROUNDS+2)*4;
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$A="edi";
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$B="esi";
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$S="ebp";
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$tmp1="eax";
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$r="ebx";
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$tmpc="ecx";
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$tmp4="edx";
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&RC5_32_encrypt("RC5_32_encrypt",1);
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&RC5_32_encrypt("RC5_32_decrypt",0);
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&cbc("RC5_32_cbc_encrypt","RC5_32_encrypt","RC5_32_decrypt",0,4,5,3,-1,-1);
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&asm_finish();
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sub RC5_32_encrypt
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{
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local($name,$enc)=@_;
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&function_begin_B($name,"");
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&comment("");
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&push("ebp");
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&push("esi");
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&push("edi");
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&mov($tmp4,&wparam(0));
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&mov($S,&wparam(1));
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&comment("Load the 2 words");
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&mov($A,&DWP(0,$tmp4,"",0));
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&mov($B,&DWP(4,$tmp4,"",0));
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&push($r);
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&mov($r, &DWP(0,$S,"",0));
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# encrypting part
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if ($enc)
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{
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&add($A, &DWP(4+0,$S,"",0));
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&add($B, &DWP(4+4,$S,"",0));
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for ($i=0; $i<$RC5_MAX_ROUNDS; $i++)
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{
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&xor($A, $B);
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&mov($tmp1, &DWP(12+$i*8,$S,"",0));
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&mov($tmpc, $B);
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&rotl($A, &LB("ecx"));
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&add($A, $tmp1);
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&xor($B, $A);
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&mov($tmp1, &DWP(16+$i*8,$S,"",0));
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&mov($tmpc, $A);
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&rotl($B, &LB("ecx"));
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&add($B, $tmp1);
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if (($i == 7) || ($i == 11))
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{
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&cmp($r, $i+1);
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&je(&label("rc5_exit"));
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}
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}
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}
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else
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{
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&cmp($r, 12);
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&je(&label("rc5_dec_12"));
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&cmp($r, 8);
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&je(&label("rc5_dec_8"));
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for ($i=$RC5_MAX_ROUNDS; $i > 0; $i--)
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{
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&set_label("rc5_dec_$i") if ($i == 12) || ($i == 8);
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&mov($tmp1, &DWP($i*8+8,$S,"",0));
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&sub($B, $tmp1);
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&mov($tmpc, $A);
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&rotr($B, &LB("ecx"));
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&xor($B, $A);
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&mov($tmp1, &DWP($i*8+4,$S,"",0));
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&sub($A, $tmp1);
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&mov($tmpc, $B);
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&rotr($A, &LB("ecx"));
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&xor($A, $B);
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}
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&sub($B, &DWP(4+4,$S,"",0));
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&sub($A, &DWP(4+0,$S,"",0));
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}
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&set_label("rc5_exit");
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&mov(&DWP(0,$tmp4,"",0),$A);
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&mov(&DWP(4,$tmp4,"",0),$B);
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&pop("ebx");
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&pop("edi");
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&pop("esi");
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&pop("ebp");
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&ret();
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&function_end_B($name);
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}
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