crypto/perlasm/cbc.pl

   1 #! /usr/bin/env perl
   2 # Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the OpenSSL license (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9
  10 # void des_ncbc_encrypt(input, output, length, schedule, ivec, enc)
  11 # des_cblock (*input);
  12 # des_cblock (*output);
  13 # long length;
  14 # des_key_schedule schedule;
  15 # des_cblock (*ivec);
  16 # int enc;
  17 #
  18 # calls
  19 # des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
  20 #
  21
  22 #&cbc("des_ncbc_encrypt","des_encrypt",0);
  23 #&cbc("BF_cbc_encrypt","BF_encrypt","BF_encrypt",
  24 #       1,4,5,3,5,-1);
  25 #&cbc("des_ncbc_encrypt","des_encrypt","des_encrypt",
  26 #       0,4,5,3,5,-1);
  27 #&cbc("des_ede3_cbc_encrypt","des_encrypt3","des_decrypt3",
  28 #       0,6,7,3,4,5);
  29 #
  30 # When doing a cipher that needs bigendian order,
  31 # for encrypt, the iv is kept in bigendian form,
  32 # while for decrypt, it is kept in little endian.
  33 sub cbc
  34         {
  35         local($name,$enc_func,$dec_func,$swap,$iv_off,$enc_off,$p1,$p2,$p3)=@_;
  36         # name is the function name
  37         # enc_func and dec_func and the functions to call for encrypt/decrypt
  38         # swap is true if byte order needs to be reversed
  39         # iv_off is parameter number for the iv
  40         # enc_off is parameter number for the encrypt/decrypt flag
  41         # p1,p2,p3 are the offsets for parameters to be passed to the
  42         # underlying calls.
  43
  44         &function_begin_B($name,"");
  45         &comment("");
  46
  47         $in="esi";
  48         $out="edi";
  49         $count="ebp";
  50
  51         &push("ebp");
  52         &push("ebx");
  53         &push("esi");
  54         &push("edi");
  55
  56         $data_off=4;
  57         $data_off+=4 if ($p1 > 0);
  58         $data_off+=4 if ($p2 > 0);
  59         $data_off+=4 if ($p3 > 0);
  60
  61         &mov($count,    &wparam(2));    # length
  62
  63         &comment("getting iv ptr from parameter $iv_off");
  64         &mov("ebx",     &wparam($iv_off));      # Get iv ptr
  65
  66         &mov($in,       &DWP(0,"ebx","",0));#   iv[0]
  67         &mov($out,      &DWP(4,"ebx","",0));#   iv[1]
  68
  69         &push($out);
  70         &push($in);
  71         &push($out);    # used in decrypt for iv[1]
  72         &push($in);     # used in decrypt for iv[0]
  73
  74         &mov("ebx",     "esp");         # This is the address of tin[2]
  75
  76         &mov($in,       &wparam(0));    # in
  77         &mov($out,      &wparam(1));    # out
  78
  79         # We have loaded them all, how lets push things
  80         &comment("getting encrypt flag from parameter $enc_off");
  81         &mov("ecx",     &wparam($enc_off));     # Get enc flag
  82         if ($p3 > 0)
  83                 {
  84                 &comment("get and push parameter $p3");
  85                 if ($enc_off != $p3)
  86                         { &mov("eax",   &wparam($p3)); &push("eax"); }
  87                 else    { &push("ecx"); }
  88                 }
  89         if ($p2 > 0)
  90                 {
  91                 &comment("get and push parameter $p2");
  92                 if ($enc_off != $p2)
  93                         { &mov("eax",   &wparam($p2)); &push("eax"); }
  94                 else    { &push("ecx"); }
  95                 }
  96         if ($p1 > 0)
  97                 {
  98                 &comment("get and push parameter $p1");
  99                 if ($enc_off != $p1)
 100                         { &mov("eax",   &wparam($p1)); &push("eax"); }
 101                 else    { &push("ecx"); }
 102                 }
 103         &push("ebx");           # push data/iv
 104
 105         &cmp("ecx",0);
 106         &jz(&label("decrypt"));
 107
 108         &and($count,0xfffffff8);
 109         &mov("eax",     &DWP($data_off,"esp","",0));    # load iv[0]
 110         &mov("ebx",     &DWP($data_off+4,"esp","",0));  # load iv[1]
 111
 112         &jz(&label("encrypt_finish"));
 113
 114         #############################################################
 115
 116         &set_label("encrypt_loop");
 117         # encrypt start
 118         # "eax" and "ebx" hold iv (or the last cipher text)
 119
 120         &mov("ecx",     &DWP(0,$in,"",0));      # load first 4 bytes
 121         &mov("edx",     &DWP(4,$in,"",0));      # second 4 bytes
 122
 123         &xor("eax",     "ecx");
 124         &xor("ebx",     "edx");
 125
 126         &bswap("eax")   if $swap;
 127         &bswap("ebx")   if $swap;
 128
 129         &mov(&DWP($data_off,"esp","",0),        "eax"); # put in array for call
 130         &mov(&DWP($data_off+4,"esp","",0),      "ebx"); #
 131
 132         &call($enc_func);
 133
 134         &mov("eax",     &DWP($data_off,"esp","",0));
 135         &mov("ebx",     &DWP($data_off+4,"esp","",0));
 136
 137         &bswap("eax")   if $swap;
 138         &bswap("ebx")   if $swap;
 139
 140         &mov(&DWP(0,$out,"",0),"eax");
 141         &mov(&DWP(4,$out,"",0),"ebx");
 142
 143         # eax and ebx are the next iv.
 144
 145         &add($in,       8);
 146         &add($out,      8);
 147
 148         &sub($count,    8);
 149         &jnz(&label("encrypt_loop"));
 150
 151 ###################################################################3
 152         &set_label("encrypt_finish");
 153         &mov($count,    &wparam(2));    # length
 154         &and($count,    7);
 155         &jz(&label("finish"));
 156         &call(&label("PIC_point"));
 157 &set_label("PIC_point");
 158         &blindpop("edx");
 159         &lea("ecx",&DWP(&label("cbc_enc_jmp_table")."-".&label("PIC_point"),"edx"));
 160         &mov($count,&DWP(0,"ecx",$count,4));
 161         &add($count,"edx");
 162         &xor("ecx","ecx");
 163         &xor("edx","edx");
 164         #&mov($count,&DWP(&label("cbc_enc_jmp_table"),"",$count,4));
 165         &jmp_ptr($count);
 166
 167 &set_label("ej7");
 168         &movb(&HB("edx"),       &BP(6,$in,"",0));
 169         &shl("edx",8);
 170 &set_label("ej6");
 171         &movb(&HB("edx"),       &BP(5,$in,"",0));
 172 &set_label("ej5");
 173         &movb(&LB("edx"),       &BP(4,$in,"",0));
 174 &set_label("ej4");
 175         &mov("ecx",             &DWP(0,$in,"",0));
 176         &jmp(&label("ejend"));
 177 &set_label("ej3");
 178         &movb(&HB("ecx"),       &BP(2,$in,"",0));
 179         &shl("ecx",8);
 180 &set_label("ej2");
 181         &movb(&HB("ecx"),       &BP(1,$in,"",0));
 182 &set_label("ej1");
 183         &movb(&LB("ecx"),       &BP(0,$in,"",0));
 184 &set_label("ejend");
 185
 186         &xor("eax",     "ecx");
 187         &xor("ebx",     "edx");
 188
 189         &bswap("eax")   if $swap;
 190         &bswap("ebx")   if $swap;
 191
 192         &mov(&DWP($data_off,"esp","",0),        "eax"); # put in array for call
 193         &mov(&DWP($data_off+4,"esp","",0),      "ebx"); #
 194
 195         &call($enc_func);
 196
 197         &mov("eax",     &DWP($data_off,"esp","",0));
 198         &mov("ebx",     &DWP($data_off+4,"esp","",0));
 199
 200         &bswap("eax")   if $swap;
 201         &bswap("ebx")   if $swap;
 202
 203         &mov(&DWP(0,$out,"",0),"eax");
 204         &mov(&DWP(4,$out,"",0),"ebx");
 205
 206         &jmp(&label("finish"));
 207
 208         #############################################################
 209         #############################################################
 210         &set_label("decrypt",1);
 211         # decrypt start
 212         &and($count,0xfffffff8);
 213         # The next 2 instructions are only for if the jz is taken
 214         &mov("eax",     &DWP($data_off+8,"esp","",0));  # get iv[0]
 215         &mov("ebx",     &DWP($data_off+12,"esp","",0)); # get iv[1]
 216         &jz(&label("decrypt_finish"));
 217
 218         &set_label("decrypt_loop");
 219         &mov("eax",     &DWP(0,$in,"",0));      # load first 4 bytes
 220         &mov("ebx",     &DWP(4,$in,"",0));      # second 4 bytes
 221
 222         &bswap("eax")   if $swap;
 223         &bswap("ebx")   if $swap;
 224
 225         &mov(&DWP($data_off,"esp","",0),        "eax"); # put back
 226         &mov(&DWP($data_off+4,"esp","",0),      "ebx"); #
 227
 228         &call($dec_func);
 229
 230         &mov("eax",     &DWP($data_off,"esp","",0));    # get return
 231         &mov("ebx",     &DWP($data_off+4,"esp","",0));  #
 232
 233         &bswap("eax")   if $swap;
 234         &bswap("ebx")   if $swap;
 235
 236         &mov("ecx",     &DWP($data_off+8,"esp","",0));  # get iv[0]
 237         &mov("edx",     &DWP($data_off+12,"esp","",0)); # get iv[1]
 238
 239         &xor("ecx",     "eax");
 240         &xor("edx",     "ebx");
 241
 242         &mov("eax",     &DWP(0,$in,"",0));      # get old cipher text,
 243         &mov("ebx",     &DWP(4,$in,"",0));      # next iv actually
 244
 245         &mov(&DWP(0,$out,"",0),"ecx");
 246         &mov(&DWP(4,$out,"",0),"edx");
 247
 248         &mov(&DWP($data_off+8,"esp","",0),      "eax"); # save iv
 249         &mov(&DWP($data_off+12,"esp","",0),     "ebx"); #
 250
 251         &add($in,       8);
 252         &add($out,      8);
 253
 254         &sub($count,    8);
 255         &jnz(&label("decrypt_loop"));
 256 ############################ ENDIT #######################3
 257         &set_label("decrypt_finish");
 258         &mov($count,    &wparam(2));    # length
 259         &and($count,    7);
 260         &jz(&label("finish"));
 261
 262         &mov("eax",     &DWP(0,$in,"",0));      # load first 4 bytes
 263         &mov("ebx",     &DWP(4,$in,"",0));      # second 4 bytes
 264
 265         &bswap("eax")   if $swap;
 266         &bswap("ebx")   if $swap;
 267
 268         &mov(&DWP($data_off,"esp","",0),        "eax"); # put back
 269         &mov(&DWP($data_off+4,"esp","",0),      "ebx"); #
 270
 271         &call($dec_func);
 272
 273         &mov("eax",     &DWP($data_off,"esp","",0));    # get return
 274         &mov("ebx",     &DWP($data_off+4,"esp","",0));  #
 275
 276         &bswap("eax")   if $swap;
 277         &bswap("ebx")   if $swap;
 278
 279         &mov("ecx",     &DWP($data_off+8,"esp","",0));  # get iv[0]
 280         &mov("edx",     &DWP($data_off+12,"esp","",0)); # get iv[1]
 281
 282         &xor("ecx",     "eax");
 283         &xor("edx",     "ebx");
 284
 285         # this is for when we exit
 286         &mov("eax",     &DWP(0,$in,"",0));      # get old cipher text,
 287         &mov("ebx",     &DWP(4,$in,"",0));      # next iv actually
 288
 289 &set_label("dj7");
 290         &rotr("edx",    16);
 291         &movb(&BP(6,$out,"",0), &LB("edx"));
 292         &shr("edx",16);
 293 &set_label("dj6");
 294         &movb(&BP(5,$out,"",0), &HB("edx"));
 295 &set_label("dj5");
 296         &movb(&BP(4,$out,"",0), &LB("edx"));
 297 &set_label("dj4");
 298         &mov(&DWP(0,$out,"",0), "ecx");
 299         &jmp(&label("djend"));
 300 &set_label("dj3");
 301         &rotr("ecx",    16);
 302         &movb(&BP(2,$out,"",0), &LB("ecx"));
 303         &shl("ecx",16);
 304 &set_label("dj2");
 305         &movb(&BP(1,$in,"",0),  &HB("ecx"));
 306 &set_label("dj1");
 307         &movb(&BP(0,$in,"",0),  &LB("ecx"));
 308 &set_label("djend");
 309
 310         # final iv is still in eax:ebx
 311         &jmp(&label("finish"));
 312
 313
 314 ############################ FINISH #######################3
 315         &set_label("finish",1);
 316         &mov("ecx",     &wparam($iv_off));      # Get iv ptr
 317
 318         #################################################
 319         $total=16+4;
 320         $total+=4 if ($p1 > 0);
 321         $total+=4 if ($p2 > 0);
 322         $total+=4 if ($p3 > 0);
 323         &add("esp",$total);
 324
 325         &mov(&DWP(0,"ecx","",0),        "eax"); # save iv
 326         &mov(&DWP(4,"ecx","",0),        "ebx"); # save iv
 327
 328         &function_end_A($name);
 329
 330         &align(64);
 331         &set_label("cbc_enc_jmp_table");
 332         &data_word("0");
 333         &data_word(&label("ej1")."-".&label("PIC_point"));
 334         &data_word(&label("ej2")."-".&label("PIC_point"));
 335         &data_word(&label("ej3")."-".&label("PIC_point"));
 336         &data_word(&label("ej4")."-".&label("PIC_point"));
 337         &data_word(&label("ej5")."-".&label("PIC_point"));
 338         &data_word(&label("ej6")."-".&label("PIC_point"));
 339         &data_word(&label("ej7")."-".&label("PIC_point"));
 340         # not used
 341         #&set_label("cbc_dec_jmp_table",1);
 342         #&data_word("0");
 343         #&data_word(&label("dj1")."-".&label("PIC_point"));
 344         #&data_word(&label("dj2")."-".&label("PIC_point"));
 345         #&data_word(&label("dj3")."-".&label("PIC_point"));
 346         #&data_word(&label("dj4")."-".&label("PIC_point"));
 347         #&data_word(&label("dj5")."-".&label("PIC_point"));
 348         #&data_word(&label("dj6")."-".&label("PIC_point"));
 349         #&data_word(&label("dj7")."-".&label("PIC_point"));
 350         &align(64);
 351
 352         &function_end_B($name);
 353
 354         }
 355
 356 1;