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 &call(&label("PIC_point")); 150 &set_label("PIC_point"); 151 &blindpop("edx"); 152 &lea("ecx",&DWP(&label("cbc_enc_jmp_table")."-".&label("PIC_point"),"edx")); 153 &mov($count,&DWP(0,"ecx",$count,4)); 154 &add($count,"edx"); 155 &xor("ecx","ecx"); 156 &xor("edx","edx"); 157 #&mov($count,&DWP(&label("cbc_enc_jmp_table"),"",$count,4)); 158 &jmp_ptr($count); 159 160 &set_label("ej7"); 161 &movb(&HB("edx"), &BP(6,$in,"",0)); 162 &shl("edx",8); 163 &set_label("ej6"); 164 &movb(&HB("edx"), &BP(5,$in,"",0)); 165 &set_label("ej5"); 166 &movb(&LB("edx"), &BP(4,$in,"",0)); 167 &set_label("ej4"); 168 &mov("ecx", &DWP(0,$in,"",0)); 169 &jmp(&label("ejend")); 170 &set_label("ej3"); 171 &movb(&HB("ecx"), &BP(2,$in,"",0)); 172 &shl("ecx",8); 173 &set_label("ej2"); 174 &movb(&HB("ecx"), &BP(1,$in,"",0)); 175 &set_label("ej1"); 176 &movb(&LB("ecx"), &BP(0,$in,"",0)); 177 &set_label("ejend"); 178 179 &xor("eax", "ecx"); 180 &xor("ebx", "edx"); 181 182 &bswap("eax") if $swap; 183 &bswap("ebx") if $swap; 184 185 &mov(&DWP($data_off,"esp","",0), "eax"); # put in array for call 186 &mov(&DWP($data_off+4,"esp","",0), "ebx"); # 187 188 &call($enc_func); 189 190 &mov("eax", &DWP($data_off,"esp","",0)); 191 &mov("ebx", &DWP($data_off+4,"esp","",0)); 192 193 &bswap("eax") if $swap; 194 &bswap("ebx") if $swap; 195 196 &mov(&DWP(0,$out,"",0),"eax"); 197 &mov(&DWP(4,$out,"",0),"ebx"); 198 199 &jmp(&label("finish")); 200 201 ############################################################# 202 ############################################################# 203 &set_label("decrypt",1); 204 # decrypt start 205 &and($count,0xfffffff8); 206 # The next 2 instructions are only for if the jz is taken 207 &mov("eax", &DWP($data_off+8,"esp","",0)); # get iv[0] 208 &mov("ebx", &DWP($data_off+12,"esp","",0)); # get iv[1] 209 &jz(&label("decrypt_finish")); 210 211 &set_label("decrypt_loop"); 212 &mov("eax", &DWP(0,$in,"",0)); # load first 4 bytes 213 &mov("ebx", &DWP(4,$in,"",0)); # second 4 bytes 214 215 &bswap("eax") if $swap; 216 &bswap("ebx") if $swap; 217 218 &mov(&DWP($data_off,"esp","",0), "eax"); # put back 219 &mov(&DWP($data_off+4,"esp","",0), "ebx"); # 220 221 &call($dec_func); 222 223 &mov("eax", &DWP($data_off,"esp","",0)); # get return 224 &mov("ebx", &DWP($data_off+4,"esp","",0)); # 225 226 &bswap("eax") if $swap; 227 &bswap("ebx") if $swap; 228 229 &mov("ecx", &DWP($data_off+8,"esp","",0)); # get iv[0] 230 &mov("edx", &DWP($data_off+12,"esp","",0)); # get iv[1] 231 232 &xor("ecx", "eax"); 233 &xor("edx", "ebx"); 234 235 &mov("eax", &DWP(0,$in,"",0)); # get old cipher text, 236 &mov("ebx", &DWP(4,$in,"",0)); # next iv actually 237 238 &mov(&DWP(0,$out,"",0),"ecx"); 239 &mov(&DWP(4,$out,"",0),"edx"); 240 241 &mov(&DWP($data_off+8,"esp","",0), "eax"); # save iv 242 &mov(&DWP($data_off+12,"esp","",0), "ebx"); # 243 244 &add($in, 8); 245 &add($out, 8); 246 247 &sub($count, 8); 248 &jnz(&label("decrypt_loop")); 249 ############################ ENDIT #######################3 250 &set_label("decrypt_finish"); 251 &mov($count, &wparam(2)); # length 252 &and($count, 7); 253 &jz(&label("finish")); 254 255 &mov("eax", &DWP(0,$in,"",0)); # load first 4 bytes 256 &mov("ebx", &DWP(4,$in,"",0)); # second 4 bytes 257 258 &bswap("eax") if $swap; 259 &bswap("ebx") if $swap; 260 261 &mov(&DWP($data_off,"esp","",0), "eax"); # put back 262 &mov(&DWP($data_off+4,"esp","",0), "ebx"); # 263 264 &call($dec_func); 265 266 &mov("eax", &DWP($data_off,"esp","",0)); # get return 267 &mov("ebx", &DWP($data_off+4,"esp","",0)); # 268 269 &bswap("eax") if $swap; 270 &bswap("ebx") if $swap; 271 272 &mov("ecx", &DWP($data_off+8,"esp","",0)); # get iv[0] 273 &mov("edx", &DWP($data_off+12,"esp","",0)); # get iv[1] 274 275 &xor("ecx", "eax"); 276 &xor("edx", "ebx"); 277 278 # this is for when we exit 279 &mov("eax", &DWP(0,$in,"",0)); # get old cipher text, 280 &mov("ebx", &DWP(4,$in,"",0)); # next iv actually 281 282 &set_label("dj7"); 283 &rotr("edx", 16); 284 &movb(&BP(6,$out,"",0), &LB("edx")); 285 &shr("edx",16); 286 &set_label("dj6"); 287 &movb(&BP(5,$out,"",0), &HB("edx")); 288 &set_label("dj5"); 289 &movb(&BP(4,$out,"",0), &LB("edx")); 290 &set_label("dj4"); 291 &mov(&DWP(0,$out,"",0), "ecx"); 292 &jmp(&label("djend")); 293 &set_label("dj3"); 294 &rotr("ecx", 16); 295 &movb(&BP(2,$out,"",0), &LB("ecx")); 296 &shl("ecx",16); 297 &set_label("dj2"); 298 &movb(&BP(1,$in,"",0), &HB("ecx")); 299 &set_label("dj1"); 300 &movb(&BP(0,$in,"",0), &LB("ecx")); 301 &set_label("djend"); 302 303 # final iv is still in eax:ebx 304 &jmp(&label("finish")); 305 306 307 ############################ FINISH #######################3 308 &set_label("finish",1); 309 &mov("ecx", &wparam($iv_off)); # Get iv ptr 310 311 ################################################# 312 $total=16+4; 313 $total+=4 if ($p1 > 0); 314 $total+=4 if ($p2 > 0); 315 $total+=4 if ($p3 > 0); 316 &add("esp",$total); 317 318 &mov(&DWP(0,"ecx","",0), "eax"); # save iv 319 &mov(&DWP(4,"ecx","",0), "ebx"); # save iv 320 321 &function_end_A($name); 322 323 &align(64); 324 &set_label("cbc_enc_jmp_table"); 325 &data_word("0"); 326 &data_word(&label("ej1")."-".&label("PIC_point")); 327 &data_word(&label("ej2")."-".&label("PIC_point")); 328 &data_word(&label("ej3")."-".&label("PIC_point")); 329 &data_word(&label("ej4")."-".&label("PIC_point")); 330 &data_word(&label("ej5")."-".&label("PIC_point")); 331 &data_word(&label("ej6")."-".&label("PIC_point")); 332 &data_word(&label("ej7")."-".&label("PIC_point")); 333 # not used 334 #&set_label("cbc_dec_jmp_table",1); 335 #&data_word("0"); 336 #&data_word(&label("dj1")."-".&label("PIC_point")); 337 #&data_word(&label("dj2")."-".&label("PIC_point")); 338 #&data_word(&label("dj3")."-".&label("PIC_point")); 339 #&data_word(&label("dj4")."-".&label("PIC_point")); 340 #&data_word(&label("dj5")."-".&label("PIC_point")); 341 #&data_word(&label("dj6")."-".&label("PIC_point")); 342 #&data_word(&label("dj7")."-".&label("PIC_point")); 343 &align(64); 344 345 &function_end_B($name); 346 347 } 348 349 1; 350
