3 # void des_ncbc_encrypt(input, output, length, schedule, ivec, enc)
5 # des_cblock (*output);
7 # des_key_schedule schedule;
12 # des_encrypt((DES_LONG *)tin,schedule,DES_ENCRYPT);
15 #&cbc("des_ncbc_encrypt","des_encrypt",0);
16 #&cbc("BF_cbc_encrypt","BF_encrypt","BF_encrypt",
18 #&cbc("des_ncbc_encrypt","des_encrypt","des_encrypt",
20 #&cbc("des_ede3_cbc_encrypt","des_encrypt3","des_decrypt3",
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.
28 local($name,$enc_func,$dec_func,$swap,$iv_off,$enc_off,$p1,$p2,$p3)=@_;
29 # name is the function name
30 # enc_func and dec_func and the functions to call for encrypt/decrypt
31 # swap is true if byte order needs to be reversed
32 # iv_off is parameter number for the iv
33 # enc_off is parameter number for the encrypt/decrypt flag
34 # p1,p2,p3 are the offsets for parameters to be passed to the
37 &function_begin_B
($name,"");
50 $data_off+=4 if ($p1 > 0);
51 $data_off+=4 if ($p2 > 0);
52 $data_off+=4 if ($p3 > 0);
54 &mov
($count, &wparam
(2)); # length
56 &comment
("getting iv ptr from parameter $iv_off");
57 &mov
("ebx", &wparam
($iv_off)); # Get iv ptr
59 &mov
($in, &DWP
(0,"ebx","",0));# iv[0]
60 &mov
($out, &DWP
(4,"ebx","",0));# iv[1]
64 &push($out); # used in decrypt for iv[1]
65 &push($in); # used in decrypt for iv[0]
67 &mov
("ebx", "esp"); # This is the address of tin[2]
69 &mov
($in, &wparam
(0)); # in
70 &mov
($out, &wparam
(1)); # out
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
77 &comment
("get and push parameter $p3");
79 { &mov
("eax", &wparam
($p3)); &push("eax"); }
80 else { &push("ecx"); }
84 &comment
("get and push parameter $p2");
86 { &mov
("eax", &wparam
($p2)); &push("eax"); }
87 else { &push("ecx"); }
91 &comment
("get and push parameter $p1");
93 { &mov
("eax", &wparam
($p1)); &push("eax"); }
94 else { &push("ecx"); }
96 &push("ebx"); # push data/iv
99 &jz
(&label
("decrypt"));
101 &and($count,0xfffffff8);
102 &mov
("eax", &DWP
($data_off,"esp","",0)); # load iv[0]
103 &mov
("ebx", &DWP
($data_off+4,"esp","",0)); # load iv[1]
105 &jz
(&label
("encrypt_finish"));
107 #############################################################
109 &set_label
("encrypt_loop");
111 # "eax" and "ebx" hold iv (or the last cipher text)
113 &mov
("ecx", &DWP
(0,$in,"",0)); # load first 4 bytes
114 &mov
("edx", &DWP
(4,$in,"",0)); # second 4 bytes
119 &bswap
("eax") if $swap;
120 &bswap
("ebx") if $swap;
122 &mov
(&DWP
($data_off,"esp","",0), "eax"); # put in array for call
123 &mov
(&DWP
($data_off+4,"esp","",0), "ebx"); #
127 &mov
("eax", &DWP
($data_off,"esp","",0));
128 &mov
("ebx", &DWP
($data_off+4,"esp","",0));
130 &bswap
("eax") if $swap;
131 &bswap
("ebx") if $swap;
133 &mov
(&DWP
(0,$out,"",0),"eax");
134 &mov
(&DWP
(4,$out,"",0),"ebx");
136 # eax and ebx are the next iv.
142 &jnz
(&label
("encrypt_loop"));
144 ###################################################################3
145 &set_label
("encrypt_finish");
146 &mov
($count, &wparam
(2)); # length
148 &jz
(&label
("finish"));
149 &call
(&label
("PIC_point"));
150 &set_label
("PIC_point");
152 &lea
("ecx",&DWP
(&label
("cbc_enc_jmp_table")."-".&label
("PIC_point"),"edx"));
153 &mov
($count,&DWP
(0,"ecx",$count,4))
157 #&mov($count,&DWP(&label("cbc_enc_jmp_table"),"",$count,4));
161 &xor("edx", "edx") if $ppro; # ppro friendly
162 &movb
(&HB
("edx"), &BP
(6,$in,"",0));
165 &movb
(&HB
("edx"), &BP
(5,$in,"",0));
167 &movb
(&LB
("edx"), &BP
(4,$in,"",0));
169 &mov
("ecx", &DWP
(0,$in,"",0));
170 &jmp
(&label
("ejend"));
172 &movb
(&HB
("ecx"), &BP
(2,$in,"",0));
173 &xor("ecx", "ecx") if $ppro; # ppro friendly
176 &movb
(&HB
("ecx"), &BP
(1,$in,"",0));
178 &movb
(&LB
("ecx"), &BP
(0,$in,"",0));
184 &bswap
("eax") if $swap;
185 &bswap
("ebx") if $swap;
187 &mov
(&DWP
($data_off,"esp","",0), "eax"); # put in array for call
188 &mov
(&DWP
($data_off+4,"esp","",0), "ebx"); #
192 &mov
("eax", &DWP
($data_off,"esp","",0));
193 &mov
("ebx", &DWP
($data_off+4,"esp","",0));
195 &bswap
("eax") if $swap;
196 &bswap
("ebx") if $swap;
198 &mov
(&DWP
(0,$out,"",0),"eax");
199 &mov
(&DWP
(4,$out,"",0),"ebx");
201 &jmp
(&label
("finish"));
203 #############################################################
204 #############################################################
205 &set_label
("decrypt",1);
207 &and($count,0xfffffff8);
208 # The next 2 instructions are only for if the jz is taken
209 &mov
("eax", &DWP
($data_off+8,"esp","",0)); # get iv[0]
210 &mov
("ebx", &DWP
($data_off+12,"esp","",0)); # get iv[1]
211 &jz
(&label
("decrypt_finish"));
213 &set_label
("decrypt_loop");
214 &mov
("eax", &DWP
(0,$in,"",0)); # load first 4 bytes
215 &mov
("ebx", &DWP
(4,$in,"",0)); # second 4 bytes
217 &bswap
("eax") if $swap;
218 &bswap
("ebx") if $swap;
220 &mov
(&DWP
($data_off,"esp","",0), "eax"); # put back
221 &mov
(&DWP
($data_off+4,"esp","",0), "ebx"); #
225 &mov
("eax", &DWP
($data_off,"esp","",0)); # get return
226 &mov
("ebx", &DWP
($data_off+4,"esp","",0)); #
228 &bswap
("eax") if $swap;
229 &bswap
("ebx") if $swap;
231 &mov
("ecx", &DWP
($data_off+8,"esp","",0)); # get iv[0]
232 &mov
("edx", &DWP
($data_off+12,"esp","",0)); # get iv[1]
237 &mov
("eax", &DWP
(0,$in,"",0)); # get old cipher text,
238 &mov
("ebx", &DWP
(4,$in,"",0)); # next iv actually
240 &mov
(&DWP
(0,$out,"",0),"ecx");
241 &mov
(&DWP
(4,$out,"",0),"edx");
243 &mov
(&DWP
($data_off+8,"esp","",0), "eax"); # save iv
244 &mov
(&DWP
($data_off+12,"esp","",0), "ebx"); #
250 &jnz
(&label
("decrypt_loop"));
251 ############################ ENDIT #######################3
252 &set_label
("decrypt_finish");
253 &mov
($count, &wparam
(2)); # length
255 &jz
(&label
("finish"));
257 &mov
("eax", &DWP
(0,$in,"",0)); # load first 4 bytes
258 &mov
("ebx", &DWP
(4,$in,"",0)); # second 4 bytes
260 &bswap
("eax") if $swap;
261 &bswap
("ebx") if $swap;
263 &mov
(&DWP
($data_off,"esp","",0), "eax"); # put back
264 &mov
(&DWP
($data_off+4,"esp","",0), "ebx"); #
268 &mov
("eax", &DWP
($data_off,"esp","",0)); # get return
269 &mov
("ebx", &DWP
($data_off+4,"esp","",0)); #
271 &bswap
("eax") if $swap;
272 &bswap
("ebx") if $swap;
274 &mov
("ecx", &DWP
($data_off+8,"esp","",0)); # get iv[0]
275 &mov
("edx", &DWP
($data_off+12,"esp","",0)); # get iv[1]
280 # this is for when we exit
281 &mov
("eax", &DWP
(0,$in,"",0)); # get old cipher text,
282 &mov
("ebx", &DWP
(4,$in,"",0)); # next iv actually
286 &movb
(&BP
(6,$out,"",0), &LB
("edx"));
289 &movb
(&BP
(5,$out,"",0), &HB
("edx"));
291 &movb
(&BP
(4,$out,"",0), &LB
("edx"));
293 &mov
(&DWP
(0,$out,"",0), "ecx");
294 &jmp
(&label
("djend"));
297 &movb
(&BP
(2,$out,"",0), &LB
("ecx"));
300 &movb
(&BP
(1,$in,"",0), &HB
("ecx"));
302 &movb
(&BP
(0,$in,"",0), &LB
("ecx"));
305 # final iv is still in eax:ebx
306 &jmp
(&label
("finish"));
309 ############################ FINISH #######################3
310 &set_label
("finish",1);
311 &mov
("ecx", &wparam
($iv_off)); # Get iv ptr
313 #################################################
315 $total+=4 if ($p1 > 0);
316 $total+=4 if ($p2 > 0);
317 $total+=4 if ($p3 > 0);
320 &mov
(&DWP
(0,"ecx","",0), "eax"); # save iv
321 &mov
(&DWP
(4,"ecx","",0), "ebx"); # save iv
323 &function_end_A
($name);
325 &set_label
("cbc_enc_jmp_table",1);
327 &data_word
(&label
("ej1")."-".&label
("PIC_point"));
328 &data_word
(&label
("ej2")."-".&label
("PIC_point"));
329 &data_word
(&label
("ej3")."-".&label
("PIC_point"));
330 &data_word
(&label
("ej4")."-".&label
("PIC_point"));
331 &data_word
(&label
("ej5")."-".&label
("PIC_point"));
332 &data_word
(&label
("ej6")."-".&label
("PIC_point"));
333 &data_word
(&label
("ej7")."-".&label
("PIC_point"));
335 #&set_label("cbc_dec_jmp_table",1);
337 #&data_word(&label("dj1")."-".&label("PIC_point"));
338 #&data_word(&label("dj2")."-".&label("PIC_point"));
339 #&data_word(&label("dj3")."-".&label("PIC_point"));
340 #&data_word(&label("dj4")."-".&label("PIC_point"));
341 #&data_word(&label("dj5")."-".&label("PIC_point"));
342 #&data_word(&label("dj6")."-".&label("PIC_point"));
343 #&data_word(&label("dj7")."-".&label("PIC_point"));
345 &function_end_B
($name);