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&mov ($key,$_tmp); # load ivp
&mov ($idx,$_len); # load len
&bswap ($s0);
&bswap ($s1);
&bswap ($s2);
&xor ($s0,&DWP(0,$key)); # xor iv
&bswap ($s3);
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&sub ($idx,16);
&jc (&label("dec_partial"));
&mov ($_len,$idx); # save len
&mov ($idx,$_inp); # load inp
&mov ($key,$_out); # load out
&mov (&DWP(0,$key),$s0); # write output
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&mov (&DWP(12,$key),$s3);
&mov ($_tmp,$idx); # save ivp
&lea ($idx,&DWP(16,$idx));
&mov ($_inp,$idx); # save inp
&lea ($key,&DWP(16,$key));
&mov ($_out,$key); # save out
&jnz (&label("dec_loop"));
&mov ($key,$_tmp); # load temp ivp
&set_label("dec_end");
&mov ($idx,$_ivp); # load user ivp
&mov ($s0,&DWP(0,$key)); # load iv
&mov ($s1,&DWP(4,$key));
&mov ($s2,&DWP(8,$key));
&mov ($s3,&DWP(12,$key));
&mov (&DWP(0,$idx),$s0); # copy back to user
&mov (&DWP(4,$idx),$s1);
&mov (&DWP(8,$idx),$s2);
&mov (&DWP(12,$idx),$s3);
&jmp (&label("dec_out"));
&set_label("dec_partial",4);
&lea ($key,$ivec);
&mov (&DWP(0,$key),$s0); # dump output to stack
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&mov (&DWP(12,$key),$s3);
&lea ($s2 eq "ecx" ? $s2 : "",&DWP(16,$idx));
&mov ($idx eq "esi" ? $idx : "",$key);
&mov ($key eq "edi" ? $key : "",$_out); # load out
&data_word(0xA4F3F689); # rep movsb # copy output
&mov ($key,$_inp); # use inp as temp ivp
&jmp (&label("dec_end"));
&set_label("dec_in_place",4);
&set_label("dec_in_place_loop");
&lea ($key,$ivec);
&mov ($s0,&DWP(0,$idx)); # read input
&mov ($s1,&DWP(4,$idx));
&mov ($s2,&DWP(8,$idx));
&mov ($s3,&DWP(12,$idx));
&mov (&DWP(0,$key),$s0); # copy to temp
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&bswap ($s0);
&mov (&DWP(12,$key),$s3);
&bswap ($s1);
&mov ($key,$_key); # load key
&bswap ($s2);
&bswap ($s3);
&call ("_x86_Camellia_decrypt");
&mov ($key,$_ivp); # load ivp
&mov ($idx,$_out); # load out
&bswap ($s0);
&bswap ($s1);
&bswap ($s2);
&xor ($s0,&DWP(0,$key)); # xor iv
&bswap ($s3);
&xor ($s1,&DWP(4,$key));
&xor ($s2,&DWP(8,$key));
&xor ($s3,&DWP(12,$key));
&mov (&DWP(0,$idx),$s0); # write output
&mov (&DWP(4,$idx),$s1);
&mov (&DWP(8,$idx),$s2);
&mov (&DWP(12,$idx),$s3);
&lea ($idx,&DWP(16,$idx));
&mov ($_out,$idx); # save out
&lea ($idx,$ivec);
&mov ($s0,&DWP(0,$idx)); # read temp
&mov ($s1,&DWP(4,$idx));
&mov ($s2,&DWP(8,$idx));
&mov ($s3,&DWP(12,$idx));
&mov (&DWP(0,$key),$s0); # copy iv
&mov (&DWP(4,$key),$s1);
&mov (&DWP(8,$key),$s2);
&mov (&DWP(12,$key),$s3);
&mov ($idx,$_inp); # load inp
&lea ($idx,&DWP(16,$idx));
&mov ($_inp,$idx); # save inp
&mov ($s2,$_len); # load len
&sub ($s2,16);
&jc (&label("dec_in_place_partial"));
&mov ($_len,$s2); # save len
&jnz (&label("dec_in_place_loop"));
&jmp (&label("dec_out"));
&set_label("dec_in_place_partial",4);
# one can argue if this is actually required...
&mov ($key eq "edi" ? $key : "",$_out);
&lea ($idx eq "esi" ? $idx : "",$ivec);
&lea ($key,&DWP(0,$key,$s2));
&lea ($idx,&DWP(16,$idx,$s2));
&neg ($s2 eq "ecx" ? $s2 : "");
&data_word(0xA4F3F689); # rep movsb # restore tail
&set_label("dec_out",4);
&mov ("esp",$_esp);
&popf ();
&function_end("Camellia_cbc_encrypt");
}
&asciz("Camellia for x86 by <appro\@openssl.org>");
&asm_finish();