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