350 lines
8.9 KiB
Perl
350 lines
8.9 KiB
Perl
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#!/usr/local/bin/perl
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# void des_ncbc_encrypt(input, output, length, schedule, ivec, enc)
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# des_cblock (*input);
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# des_cblock (*output);
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# long length;
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# des_key_schedule schedule;
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# des_cblock (*ivec);
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# int enc;
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#
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# calls
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# des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
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#
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#&cbc("des_ncbc_encrypt","des_encrypt",0);
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#&cbc("BF_cbc_encrypt","BF_encrypt","BF_encrypt",
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# 1,4,5,3,5,-1);
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#&cbc("des_ncbc_encrypt","des_encrypt","des_encrypt",
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# 0,4,5,3,5,-1);
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#&cbc("des_ede3_cbc_encrypt","des_encrypt3","des_decrypt3",
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# 0,6,7,3,4,5);
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#
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# When doing a cipher that needs bigendian order,
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# for encrypt, the iv is kept in bigendian form,
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# while for decrypt, it is kept in little endian.
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sub cbc
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{
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local($name,$enc_func,$dec_func,$swap,$iv_off,$enc_off,$p1,$p2,$p3)=@_;
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# name is the function name
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# enc_func and dec_func and the functions to call for encrypt/decrypt
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# swap is true if byte order needs to be reversed
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# iv_off is parameter number for the iv
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# enc_off is parameter number for the encrypt/decrypt flag
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# p1,p2,p3 are the offsets for parameters to be passed to the
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# underlying calls.
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&function_begin_B($name,"");
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&comment("");
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$in="esi";
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$out="edi";
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$count="ebp";
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&push("ebp");
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&push("ebx");
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&push("esi");
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&push("edi");
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$data_off=4;
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$data_off+=4 if ($p1 > 0);
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$data_off+=4 if ($p2 > 0);
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$data_off+=4 if ($p3 > 0);
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&mov($count, &wparam(2)); # length
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&comment("getting iv ptr from parameter $iv_off");
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&mov("ebx", &wparam($iv_off)); # Get iv ptr
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&mov($in, &DWP(0,"ebx","",0));# iv[0]
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&mov($out, &DWP(4,"ebx","",0));# iv[1]
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&push($out);
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&push($in);
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&push($out); # used in decrypt for iv[1]
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&push($in); # used in decrypt for iv[0]
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&mov("ebx", "esp"); # This is the address of tin[2]
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&mov($in, &wparam(0)); # in
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&mov($out, &wparam(1)); # out
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# We have loaded them all, how lets push things
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&comment("getting encrypt flag from parameter $enc_off");
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&mov("ecx", &wparam($enc_off)); # Get enc flag
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if ($p3 > 0)
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{
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&comment("get and push parameter $p3");
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if ($enc_off != $p3)
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{ &mov("eax", &wparam($p3)); &push("eax"); }
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else { &push("ecx"); }
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}
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if ($p2 > 0)
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{
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&comment("get and push parameter $p2");
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if ($enc_off != $p2)
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{ &mov("eax", &wparam($p2)); &push("eax"); }
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else { &push("ecx"); }
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}
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if ($p1 > 0)
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{
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&comment("get and push parameter $p1");
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if ($enc_off != $p1)
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{ &mov("eax", &wparam($p1)); &push("eax"); }
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else { &push("ecx"); }
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}
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&push("ebx"); # push data/iv
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&cmp("ecx",0);
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&jz(&label("decrypt"));
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&and($count,0xfffffff8);
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&mov("eax", &DWP($data_off,"esp","",0)); # load iv[0]
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&mov("ebx", &DWP($data_off+4,"esp","",0)); # load iv[1]
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&jz(&label("encrypt_finish"));
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#############################################################
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&set_label("encrypt_loop");
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# encrypt start
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# "eax" and "ebx" hold iv (or the last cipher text)
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&mov("ecx", &DWP(0,$in,"",0)); # load first 4 bytes
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&mov("edx", &DWP(4,$in,"",0)); # second 4 bytes
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&xor("eax", "ecx");
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&xor("ebx", "edx");
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&bswap("eax") if $swap;
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&bswap("ebx") if $swap;
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&mov(&DWP($data_off,"esp","",0), "eax"); # put in array for call
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&mov(&DWP($data_off+4,"esp","",0), "ebx"); #
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&call($enc_func);
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&mov("eax", &DWP($data_off,"esp","",0));
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&mov("ebx", &DWP($data_off+4,"esp","",0));
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&bswap("eax") if $swap;
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&bswap("ebx") if $swap;
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&mov(&DWP(0,$out,"",0),"eax");
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&mov(&DWP(4,$out,"",0),"ebx");
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# eax and ebx are the next iv.
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&add($in, 8);
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&add($out, 8);
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&sub($count, 8);
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&jnz(&label("encrypt_loop"));
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###################################################################3
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&set_label("encrypt_finish");
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&mov($count, &wparam(2)); # length
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&and($count, 7);
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&jz(&label("finish"));
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&call(&label("PIC_point"));
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&set_label("PIC_point");
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&blindpop("edx");
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&lea("ecx",&DWP(&label("cbc_enc_jmp_table")."-".&label("PIC_point"),"edx"));
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&mov($count,&DWP(0,"ecx",$count,4))
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&add($count,"edx");
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&xor("ecx","ecx");
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&xor("edx","edx");
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#&mov($count,&DWP(&label("cbc_enc_jmp_table"),"",$count,4));
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&jmp_ptr($count);
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&set_label("ej7");
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&movb(&HB("edx"), &BP(6,$in,"",0));
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&shl("edx",8);
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&set_label("ej6");
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&movb(&HB("edx"), &BP(5,$in,"",0));
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&set_label("ej5");
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&movb(&LB("edx"), &BP(4,$in,"",0));
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&set_label("ej4");
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&mov("ecx", &DWP(0,$in,"",0));
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&jmp(&label("ejend"));
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&set_label("ej3");
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&movb(&HB("ecx"), &BP(2,$in,"",0));
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&shl("ecx",8);
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&set_label("ej2");
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&movb(&HB("ecx"), &BP(1,$in,"",0));
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&set_label("ej1");
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&movb(&LB("ecx"), &BP(0,$in,"",0));
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&set_label("ejend");
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&xor("eax", "ecx");
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&xor("ebx", "edx");
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&bswap("eax") if $swap;
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&bswap("ebx") if $swap;
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&mov(&DWP($data_off,"esp","",0), "eax"); # put in array for call
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&mov(&DWP($data_off+4,"esp","",0), "ebx"); #
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&call($enc_func);
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&mov("eax", &DWP($data_off,"esp","",0));
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&mov("ebx", &DWP($data_off+4,"esp","",0));
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&bswap("eax") if $swap;
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&bswap("ebx") if $swap;
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&mov(&DWP(0,$out,"",0),"eax");
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&mov(&DWP(4,$out,"",0),"ebx");
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&jmp(&label("finish"));
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#############################################################
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#############################################################
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&set_label("decrypt",1);
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# decrypt start
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&and($count,0xfffffff8);
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# The next 2 instructions are only for if the jz is taken
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&mov("eax", &DWP($data_off+8,"esp","",0)); # get iv[0]
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&mov("ebx", &DWP($data_off+12,"esp","",0)); # get iv[1]
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&jz(&label("decrypt_finish"));
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&set_label("decrypt_loop");
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&mov("eax", &DWP(0,$in,"",0)); # load first 4 bytes
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&mov("ebx", &DWP(4,$in,"",0)); # second 4 bytes
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&bswap("eax") if $swap;
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&bswap("ebx") if $swap;
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&mov(&DWP($data_off,"esp","",0), "eax"); # put back
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&mov(&DWP($data_off+4,"esp","",0), "ebx"); #
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&call($dec_func);
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&mov("eax", &DWP($data_off,"esp","",0)); # get return
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&mov("ebx", &DWP($data_off+4,"esp","",0)); #
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&bswap("eax") if $swap;
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&bswap("ebx") if $swap;
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&mov("ecx", &DWP($data_off+8,"esp","",0)); # get iv[0]
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&mov("edx", &DWP($data_off+12,"esp","",0)); # get iv[1]
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&xor("ecx", "eax");
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&xor("edx", "ebx");
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&mov("eax", &DWP(0,$in,"",0)); # get old cipher text,
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&mov("ebx", &DWP(4,$in,"",0)); # next iv actually
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&mov(&DWP(0,$out,"",0),"ecx");
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&mov(&DWP(4,$out,"",0),"edx");
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&mov(&DWP($data_off+8,"esp","",0), "eax"); # save iv
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&mov(&DWP($data_off+12,"esp","",0), "ebx"); #
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&add($in, 8);
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&add($out, 8);
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&sub($count, 8);
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&jnz(&label("decrypt_loop"));
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############################ ENDIT #######################3
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&set_label("decrypt_finish");
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&mov($count, &wparam(2)); # length
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&and($count, 7);
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&jz(&label("finish"));
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&mov("eax", &DWP(0,$in,"",0)); # load first 4 bytes
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&mov("ebx", &DWP(4,$in,"",0)); # second 4 bytes
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&bswap("eax") if $swap;
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&bswap("ebx") if $swap;
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&mov(&DWP($data_off,"esp","",0), "eax"); # put back
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&mov(&DWP($data_off+4,"esp","",0), "ebx"); #
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&call($dec_func);
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&mov("eax", &DWP($data_off,"esp","",0)); # get return
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&mov("ebx", &DWP($data_off+4,"esp","",0)); #
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&bswap("eax") if $swap;
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&bswap("ebx") if $swap;
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&mov("ecx", &DWP($data_off+8,"esp","",0)); # get iv[0]
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&mov("edx", &DWP($data_off+12,"esp","",0)); # get iv[1]
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&xor("ecx", "eax");
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&xor("edx", "ebx");
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# this is for when we exit
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&mov("eax", &DWP(0,$in,"",0)); # get old cipher text,
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&mov("ebx", &DWP(4,$in,"",0)); # next iv actually
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&set_label("dj7");
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&rotr("edx", 16);
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&movb(&BP(6,$out,"",0), &LB("edx"));
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&shr("edx",16);
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&set_label("dj6");
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&movb(&BP(5,$out,"",0), &HB("edx"));
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&set_label("dj5");
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&movb(&BP(4,$out,"",0), &LB("edx"));
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&set_label("dj4");
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&mov(&DWP(0,$out,"",0), "ecx");
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&jmp(&label("djend"));
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&set_label("dj3");
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&rotr("ecx", 16);
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&movb(&BP(2,$out,"",0), &LB("ecx"));
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&shl("ecx",16);
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&set_label("dj2");
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&movb(&BP(1,$in,"",0), &HB("ecx"));
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&set_label("dj1");
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&movb(&BP(0,$in,"",0), &LB("ecx"));
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&set_label("djend");
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# final iv is still in eax:ebx
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&jmp(&label("finish"));
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############################ FINISH #######################3
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&set_label("finish",1);
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&mov("ecx", &wparam($iv_off)); # Get iv ptr
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#################################################
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$total=16+4;
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$total+=4 if ($p1 > 0);
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$total+=4 if ($p2 > 0);
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$total+=4 if ($p3 > 0);
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&add("esp",$total);
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&mov(&DWP(0,"ecx","",0), "eax"); # save iv
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&mov(&DWP(4,"ecx","",0), "ebx"); # save iv
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&function_end_A($name);
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&align(64);
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&set_label("cbc_enc_jmp_table");
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&data_word("0");
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&data_word(&label("ej1")."-".&label("PIC_point"));
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&data_word(&label("ej2")."-".&label("PIC_point"));
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&data_word(&label("ej3")."-".&label("PIC_point"));
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&data_word(&label("ej4")."-".&label("PIC_point"));
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&data_word(&label("ej5")."-".&label("PIC_point"));
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&data_word(&label("ej6")."-".&label("PIC_point"));
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&data_word(&label("ej7")."-".&label("PIC_point"));
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# not used
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#&set_label("cbc_dec_jmp_table",1);
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#&data_word("0");
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#&data_word(&label("dj1")."-".&label("PIC_point"));
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#&data_word(&label("dj2")."-".&label("PIC_point"));
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#&data_word(&label("dj3")."-".&label("PIC_point"));
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#&data_word(&label("dj4")."-".&label("PIC_point"));
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#&data_word(&label("dj5")."-".&label("PIC_point"));
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#&data_word(&label("dj6")."-".&label("PIC_point"));
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#&data_word(&label("dj7")."-".&label("PIC_point"));
|
||
|
|
&align(64);
|
||
|
|
|
||
|
|
&function_end_B($name);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
1;
|