diff options
Diffstat (limited to 'crypto/rc4/asm/rc4-586.pl')
| -rw-r--r-- | crypto/rc4/asm/rc4-586.pl | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/crypto/rc4/asm/rc4-586.pl b/crypto/rc4/asm/rc4-586.pl new file mode 100644 index 0000000000..7ef889e5a1 --- /dev/null +++ b/crypto/rc4/asm/rc4-586.pl @@ -0,0 +1,173 @@ +#!/usr/local/bin/perl + +# define for pentium pro friendly version + +push(@INC,"perlasm","../../perlasm"); +require "x86asm.pl"; + +&asm_init($ARGV[0],"rc4-586.pl"); + +$tx="eax"; +$ty="ebx"; +$x="ecx"; +$y="edx"; +$in="esi"; +$out="edi"; +$d="ebp"; + +&RC4("RC4"); + +&asm_finish(); + +sub RC4_loop + { + local($n,$p,$char)=@_; + + &comment("Round $n"); + + if ($char) + { + if ($p >= 0) + { + &mov($ty, &swtmp(2)); + &cmp($ty, $in); + &jle(&label("finished")); + &inc($in); + } + else + { + &add($ty, 8); + &inc($in); + &cmp($ty, $in); + &jl(&label("finished")); + &mov(&swtmp(2), $ty); + } + } + # Moved out + # &mov( $tx, &DWP(0,$d,$x,4)) if $p < 0; + + &add( $y, $tx); + &and( $y, 0xff); + &inc( $x); # NEXT ROUND + &mov( $ty, &DWP(0,$d,$y,4)); + # XXX + &mov( &DWP(-4,$d,$x,4),$ty); # AGI + &add( $ty, $tx); + &and( $x, 0xff); # NEXT ROUND + &and( $ty, 0xff); + &mov( &DWP(0,$d,$y,4),$tx); + &nop(); + &mov( $ty, &DWP(0,$d,$ty,4)); + &mov( $tx, &DWP(0,$d,$x,4)) if $p < 1; # NEXT ROUND + # XXX + + if (!$char) + { + #moved up into last round + if ($p >= 1) + { + &add( $out, 8) + } + &movb( &BP($n,"esp","",0), &LB($ty)); + } + else + { + # Note in+=8 has occured + &movb( &HB($ty), &BP(-1,$in,"",0)); + # XXX + &xorb(&LB($ty), &HB($ty)); + # XXX + &movb(&BP($n,$out,"",0),&LB($ty)); + } + } + + +sub RC4 + { + local($name)=@_; + + &function_begin_B($name,""); + + &comment(""); + + &push("ebp"); + &push("ebx"); + &mov( $d, &wparam(0)); # key + &mov( $ty, &wparam(1)); # num + &push("esi"); + &push("edi"); + + &mov( $x, &DWP(0,$d,"",1)); + &mov( $y, &DWP(4,$d,"",1)); + + &mov( $in, &wparam(2)); + &inc( $x); + + &stack_push(3); # 3 temp variables + &add( $d, 8); + &and( $x, 0xff); + + &lea( $ty, &DWP(-8,$ty,$in)); + + # check for 0 length input + + &mov( $out, &wparam(3)); + &mov( &swtmp(2), $ty); # this is now address to exit at + &mov( $tx, &DWP(0,$d,$x,4)); + + &cmp( $ty, $in); + &jl( &label("end")); # less than 8 bytes + + &set_label("start"); + + # filling DELAY SLOT + &add( $in, 8); + + &RC4_loop(0,-1,0); + &RC4_loop(1,0,0); + &RC4_loop(2,0,0); + &RC4_loop(3,0,0); + &RC4_loop(4,0,0); + &RC4_loop(5,0,0); + &RC4_loop(6,0,0); + &RC4_loop(7,1,0); + + &comment("apply the cipher text"); + # xor the cipher data with input + + #&add( $out, 8); #moved up into last round + + &mov( $tx, &swtmp(0)); + &mov( $ty, &DWP(-8,$in,"",0)); + &xor( $tx, $ty); + &mov( $ty, &DWP(-4,$in,"",0)); + &mov( &DWP(-8,$out,"",0), $tx); + &mov( $tx, &swtmp(1)); + &xor( $tx, $ty); + &mov( $ty, &swtmp(2)); # load end ptr; + &mov( &DWP(-4,$out,"",0), $tx); + &mov( $tx, &DWP(0,$d,$x,4)); + &cmp($in, $ty); + &jle(&label("start")); + + &set_label("end"); + + # There is quite a bit of extra crap in RC4_loop() for this + # first round + &RC4_loop(0,-1,1); + &RC4_loop(1,0,1); + &RC4_loop(2,0,1); + &RC4_loop(3,0,1); + &RC4_loop(4,0,1); + &RC4_loop(5,0,1); + &RC4_loop(6,1,1); + + &set_label("finished"); + &dec( $x); + &stack_pop(3); + &mov( &DWP(-4,$d,"",0),$y); + &movb( &BP(-8,$d,"",0),&LB($x)); + + &function_end($name); + } + |