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349 lines
8.9 KiB
349 lines
8.9 KiB
#!/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")); |
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&align(64); |
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&function_end_B($name); |
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} |
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1;
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