generic-library/openssl
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Fix for "strange errors" exposed by ccgost engine. The fix is

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two extra insructions in sqradd loop at line #503.
This commit is contained in:
Andy Polyakov 2006-12-27 10:59:51 +00:00
parent 123b23fa95
commit 8f2d60ec26
1 changed files with 10 additions and 10 deletions
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20
crypto/bn/asm/x86-mont.pl
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@ -360,7 +360,7 @@ $carry="ebp";
&mov ($carry,"edx");
&mul ($word); # np[j]*m
&add ($carry,&DWP($frame,"esp",$j,4)); # +=tp[j]
&add ($carry,&DWP($frame,"esp",$num,4)); # +=tp[num-1]
&adc ("edx",0);
&add ($carry,"eax");
&adc ("edx",0);
@ -374,9 +374,9 @@ $carry="ebp";
&mov (&DWP($frame,"esp",$num,4),"edx"); # tp[num-1]=
&cmp ($j,$_bpend);
&mov (&DWP($frame+4,"esp",$num,4),"eax"); # tp[num]=
&je (&label("x86done"));
&je (&label("common_tail"));
&mov ($word,&DWP(0,$j)); # bp[i]
&mov ($word,&DWP(0,$j)); # bp[i+1]
&mov ($inp,$_ap);
&mov ($_bp,$j); # &bp[++i]
&xor ($j,$j);
@ -473,7 +473,7 @@ $sbit=$num;
&mov (&DWP($frame,"esp",$num,4),"edx"); # tp[num-1]=
&cmp ($j,$num);
&mov (&DWP($frame+4,"esp",$num,4),"eax"); # tp[num]=
&je (&label("x86done"));
&je (&label("common_tail"));
&mov ($word,&DWP(4,$inp,$j,4)); # ap[i]
&lea ($j,&DWP(1,$j));
@ -500,6 +500,8 @@ $sbit=$num;
&adc ("edx",0);
&lea ($carry,&DWP(0,$sbit,"eax",2));
&shr ("eax",31);
&cmp ($carry,$sbit);
&adc ("eax",0);
&add ($carry,&DWP($frame-4,"esp",$j,4)); # +=tp[j]
&adc ("eax",0);
&cmp ($j,$_num);
@ -529,12 +531,10 @@ $sbit=$num;
&mov ("eax",&DWP(4,$inp)); # np[1]
&jmp (&label("3rdmadd"));
&set_label("x86done",4);
&mov ($np,$_np); # make adjustments for tail processing
}
&set_label("common_tail",16);
&mov ($np,$_np);
&mov ("esi",&DWP($frame+4,"esp",$num,4));# load upmost overflow bit
&mov ($rp,$_rp); # load result pointer
# [$ap and $bp are zapped]
@ -563,12 +563,12 @@ $sbit=$num;
&mov ($j,$num); # j=num-1
&sbb ("esi",0); # esi holds upmost overflow bit
&jc (&label("copy"));
&set_label("zap",16);
&set_label("zap",8);
&mov (&DWP($frame,"esp",$j,4),$i); # zap temporary vector
&dec ($j);
&jge (&label("zap"));
&set_label("exit",4);
&set_label("exit",8);
&mov ("esp",$_sp); # pull saved stack pointer
&mov ("eax",1);
&set_label("just_leave");