freeswan/libcrypto/perlasm/cbc.pl

   1 #!/usr/local/bin/perl
   2
   3 # void des_ncbc_encrypt(input, output, length, schedule, ivec, enc)
   4 # des_cblock (*input);
   5 # des_cblock (*output);
   6 # long length;
   7 # des_key_schedule schedule;
   8 # des_cblock (*ivec);
   9 # int enc;
  10 #
  11 # calls
  12 # des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
  13 #
  14
  15 #&cbc("des_ncbc_encrypt","des_encrypt",0);
  16 #&cbc("BF_cbc_encrypt","BF_encrypt","BF_encrypt",
  17 #       1,4,5,3,5,-1);
  18 #&cbc("des_ncbc_encrypt","des_encrypt","des_encrypt",
  19 #       0,4,5,3,5,-1);
  20 #&cbc("des_ede3_cbc_encrypt","des_encrypt3","des_decrypt3",
  21 #       0,6,7,3,4,5);
  22 #
  23 # When doing a cipher that needs bigendian order,
  24 # for encrypt, the iv is kept in bigendian form,
  25 # while for decrypt, it is kept in little endian.
  26 sub cbc
  27         {
  28         local($name,$enc_func,$dec_func,$swap,$iv_off,$enc_off,$p1,$p2,$p3)=@_;
  29         # name is the function name
  30         # enc_func and dec_func and the functions to call for encrypt/decrypt
  31         # swap is true if byte order needs to be reversed
  32         # iv_off is parameter number for the iv
  33         # enc_off is parameter number for the encrypt/decrypt flag
  34         # p1,p2,p3 are the offsets for parameters to be passed to the
  35         # underlying calls.
  36
  37         &function_begin_B($name,"");
  38         &comment("");
  39
  40         $in="esi";
  41         $out="edi";
  42         $count="ebp";
  43
  44         &push("ebp");
  45         &push("ebx");
  46         &push("esi");
  47         &push("edi");
  48
  49         $data_off=4;
  50         $data_off+=4 if ($p1 > 0);
  51         $data_off+=4 if ($p2 > 0);
  52         $data_off+=4 if ($p3 > 0);
  53
  54         &mov($count,    &wparam(2));    # length
  55
  56         &comment("getting iv ptr from parameter $iv_off");
  57         &mov("ebx",     &wparam($iv_off));      # Get iv ptr
  58
  59         &mov($in,       &DWP(0,"ebx","",0));#   iv[0]
  60         &mov($out,      &DWP(4,"ebx","",0));#   iv[1]
  61
  62         &push($out);
  63         &push($in);
  64         &push($out);    # used in decrypt for iv[1]
  65         &push($in);     # used in decrypt for iv[0]
  66
  67         &mov("ebx",     "esp");         # This is the address of tin[2]
  68
  69         &mov($in,       &wparam(0));    # in
  70         &mov($out,      &wparam(1));    # out
  71
  72         # We have loaded them all, how lets push things
  73         &comment("getting encrypt flag from parameter $enc_off");
  74         &mov("ecx",     &wparam($enc_off));     # Get enc flag
  75         if ($p3 > 0)
  76                 {
  77                 &comment("get and push parameter $p3");
  78                 if ($enc_off != $p3)
  79                         { &mov("eax",   &wparam($p3)); &push("eax"); }
  80                 else    { &push("ecx"); }
  81                 }
  82         if ($p2 > 0)
  83                 {
  84                 &comment("get and push parameter $p2");
  85                 if ($enc_off != $p2)
  86                         { &mov("eax",   &wparam($p2)); &push("eax"); }
  87                 else    { &push("ecx"); }
  88                 }
  89         if ($p1 > 0)
  90                 {
  91                 &comment("get and push parameter $p1");
  92                 if ($enc_off != $p1)
  93                         { &mov("eax",   &wparam($p1)); &push("eax"); }
  94                 else    { &push("ecx"); }
  95                 }
  96         &push("ebx");           # push data/iv
  97
  98         &cmp("ecx",0);
  99         &jz(&label("decrypt"));
 100
 101         &and($count,0xfffffff8);
 102         &mov("eax",     &DWP($data_off,"esp","",0));    # load iv[0]
 103         &mov("ebx",     &DWP($data_off+4,"esp","",0));  # load iv[1]
 104
 105         &jz(&label("encrypt_finish"));
 106
 107         #############################################################
 108
 109         &set_label("encrypt_loop");
 110         # encrypt start
 111         # "eax" and "ebx" hold iv (or the last cipher text)
 112
 113         &mov("ecx",     &DWP(0,$in,"",0));      # load first 4 bytes
 114         &mov("edx",     &DWP(4,$in,"",0));      # second 4 bytes
 115
 116         &xor("eax",     "ecx");
 117         &xor("ebx",     "edx");
 118
 119         &bswap("eax")   if $swap;
 120         &bswap("ebx")   if $swap;
 121
 122         &mov(&DWP($data_off,"esp","",0),        "eax"); # put in array for call
 123         &mov(&DWP($data_off+4,"esp","",0),      "ebx"); #
 124
 125         &call($enc_func);
 126
 127         &mov("eax",     &DWP($data_off,"esp","",0));
 128         &mov("ebx",     &DWP($data_off+4,"esp","",0));
 129
 130         &bswap("eax")   if $swap;
 131         &bswap("ebx")   if $swap;
 132
 133         &mov(&DWP(0,$out,"",0),"eax");
 134         &mov(&DWP(4,$out,"",0),"ebx");
 135
 136         # eax and ebx are the next iv.
 137
 138         &add($in,       8);
 139         &add($out,      8);
 140
 141         &sub($count,    8);
 142         &jnz(&label("encrypt_loop"));
 143
 144 ###################################################################3
 145         &set_label("encrypt_finish");
 146         &mov($count,    &wparam(2));    # length
 147         &and($count,    7);
 148         &jz(&label("finish"));
 149         &xor("ecx","ecx");
 150         &xor("edx","edx");
 151         &mov($count,&DWP(&label("cbc_enc_jmp_table"),"",$count,4));
 152         &jmp_ptr($count);
 153
 154 &set_label("ej7");
 155         &xor("edx",             "edx") if $ppro; # ppro friendly
 156         &movb(&HB("edx"),       &BP(6,$in,"",0));
 157         &shl("edx",8);
 158 &set_label("ej6");
 159         &movb(&HB("edx"),       &BP(5,$in,"",0));
 160 &set_label("ej5");
 161         &movb(&LB("edx"),       &BP(4,$in,"",0));
 162 &set_label("ej4");
 163         &mov("ecx",             &DWP(0,$in,"",0));
 164         &jmp(&label("ejend"));
 165 &set_label("ej3");
 166         &movb(&HB("ecx"),       &BP(2,$in,"",0));
 167         &xor("ecx",             "ecx") if $ppro; # ppro friendly
 168         &shl("ecx",8);
 169 &set_label("ej2");
 170         &movb(&HB("ecx"),       &BP(1,$in,"",0));
 171 &set_label("ej1");
 172         &movb(&LB("ecx"),       &BP(0,$in,"",0));
 173 &set_label("ejend");
 174
 175         &xor("eax",     "ecx");
 176         &xor("ebx",     "edx");
 177
 178         &bswap("eax")   if $swap;
 179         &bswap("ebx")   if $swap;
 180
 181         &mov(&DWP($data_off,"esp","",0),        "eax"); # put in array for call
 182         &mov(&DWP($data_off+4,"esp","",0),      "ebx"); #
 183
 184         &call($enc_func);
 185
 186         &mov("eax",     &DWP($data_off,"esp","",0));
 187         &mov("ebx",     &DWP($data_off+4,"esp","",0));
 188
 189         &bswap("eax")   if $swap;
 190         &bswap("ebx")   if $swap;
 191
 192         &mov(&DWP(0,$out,"",0),"eax");
 193         &mov(&DWP(4,$out,"",0),"ebx");
 194
 195         &jmp(&label("finish"));
 196
 197         #############################################################
 198         #############################################################
 199         &set_label("decrypt",1);
 200         # decrypt start
 201         &and($count,0xfffffff8);
 202         # The next 2 instructions are only for if the jz is taken
 203         &mov("eax",     &DWP($data_off+8,"esp","",0));  # get iv[0]
 204         &mov("ebx",     &DWP($data_off+12,"esp","",0)); # get iv[1]
 205         &jz(&label("decrypt_finish"));
 206
 207         &set_label("decrypt_loop");
 208         &mov("eax",     &DWP(0,$in,"",0));      # load first 4 bytes
 209         &mov("ebx",     &DWP(4,$in,"",0));      # second 4 bytes
 210
 211         &bswap("eax")   if $swap;
 212         &bswap("ebx")   if $swap;
 213
 214         &mov(&DWP($data_off,"esp","",0),        "eax"); # put back
 215         &mov(&DWP($data_off+4,"esp","",0),      "ebx"); #
 216
 217         &call($dec_func);
 218
 219         &mov("eax",     &DWP($data_off,"esp","",0));    # get return
 220         &mov("ebx",     &DWP($data_off+4,"esp","",0));  #
 221
 222         &bswap("eax")   if $swap;
 223         &bswap("ebx")   if $swap;
 224
 225         &mov("ecx",     &DWP($data_off+8,"esp","",0));  # get iv[0]
 226         &mov("edx",     &DWP($data_off+12,"esp","",0)); # get iv[1]
 227
 228         &xor("ecx",     "eax");
 229         &xor("edx",     "ebx");
 230
 231         &mov("eax",     &DWP(0,$in,"",0));      # get old cipher text,
 232         &mov("ebx",     &DWP(4,$in,"",0));      # next iv actually
 233
 234         &mov(&DWP(0,$out,"",0),"ecx");
 235         &mov(&DWP(4,$out,"",0),"edx");
 236
 237         &mov(&DWP($data_off+8,"esp","",0),      "eax"); # save iv
 238         &mov(&DWP($data_off+12,"esp","",0),     "ebx"); #
 239
 240         &add($in,       8);
 241         &add($out,      8);
 242
 243         &sub($count,    8);
 244         &jnz(&label("decrypt_loop"));
 245 ############################ ENDIT #######################3
 246         &set_label("decrypt_finish");
 247         &mov($count,    &wparam(2));    # length
 248         &and($count,    7);
 249         &jz(&label("finish"));
 250
 251         &mov("eax",     &DWP(0,$in,"",0));      # load first 4 bytes
 252         &mov("ebx",     &DWP(4,$in,"",0));      # second 4 bytes
 253
 254         &bswap("eax")   if $swap;
 255         &bswap("ebx")   if $swap;
 256
 257         &mov(&DWP($data_off,"esp","",0),        "eax"); # put back
 258         &mov(&DWP($data_off+4,"esp","",0),      "ebx"); #
 259
 260         &call($dec_func);
 261
 262         &mov("eax",     &DWP($data_off,"esp","",0));    # get return
 263         &mov("ebx",     &DWP($data_off+4,"esp","",0));  #
 264
 265         &bswap("eax")   if $swap;
 266         &bswap("ebx")   if $swap;
 267
 268         &mov("ecx",     &DWP($data_off+8,"esp","",0));  # get iv[0]
 269         &mov("edx",     &DWP($data_off+12,"esp","",0)); # get iv[1]
 270
 271         &xor("ecx",     "eax");
 272         &xor("edx",     "ebx");
 273
 274         # this is for when we exit
 275         &mov("eax",     &DWP(0,$in,"",0));      # get old cipher text,
 276         &mov("ebx",     &DWP(4,$in,"",0));      # next iv actually
 277
 278 &set_label("dj7");
 279         &rotr("edx",    16);
 280         &movb(&BP(6,$out,"",0), &LB("edx"));
 281         &shr("edx",16);
 282 &set_label("dj6");
 283         &movb(&BP(5,$out,"",0), &HB("edx"));
 284 &set_label("dj5");
 285         &movb(&BP(4,$out,"",0), &LB("edx"));
 286 &set_label("dj4");
 287         &mov(&DWP(0,$out,"",0), "ecx");
 288         &jmp(&label("djend"));
 289 &set_label("dj3");
 290         &rotr("ecx",    16);
 291         &movb(&BP(2,$out,"",0), &LB("ecx"));
 292         &shl("ecx",16);
 293 &set_label("dj2");
 294         &movb(&BP(1,$in,"",0),  &HB("ecx"));
 295 &set_label("dj1");
 296         &movb(&BP(0,$in,"",0),  &LB("ecx"));
 297 &set_label("djend");
 298
 299         # final iv is still in eax:ebx
 300         &jmp(&label("finish"));
 301
 302
 303 ############################ FINISH #######################3
 304         &set_label("finish",1);
 305         &mov("ecx",     &wparam($iv_off));      # Get iv ptr
 306
 307         #################################################
 308         $total=16+4;
 309         $total+=4 if ($p1 > 0);
 310         $total+=4 if ($p2 > 0);
 311         $total+=4 if ($p3 > 0);
 312         &add("esp",$total);
 313
 314         &mov(&DWP(0,"ecx","",0),        "eax"); # save iv
 315         &mov(&DWP(4,"ecx","",0),        "ebx"); # save iv
 316
 317         &function_end_A($name);
 318
 319         &set_label("cbc_enc_jmp_table",1);
 320         &data_word("0");
 321         &data_word(&label("ej1"));
 322         &data_word(&label("ej2"));
 323         &data_word(&label("ej3"));
 324         &data_word(&label("ej4"));
 325         &data_word(&label("ej5"));
 326         &data_word(&label("ej6"));
 327         &data_word(&label("ej7"));
 328         &set_label("cbc_dec_jmp_table",1);
 329         &data_word("0");
 330         &data_word(&label("dj1"));
 331         &data_word(&label("dj2"));
 332         &data_word(&label("dj3"));
 333         &data_word(&label("dj4"));
 334         &data_word(&label("dj5"));
 335         &data_word(&label("dj6"));
 336         &data_word(&label("dj7"));
 337
 338         &function_end_B($name);
 339
 340         }
 341
 342 1;