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[/] [apbtoaes128/] [trunk/] [pli/] [bfm_ecb/] [aes_bfm_encryption_ecb.h] - Blame information for rev 18

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1 4 redbear
//////////////////////////////////////////////////////////////////
2
////
3
////
4
////    AES CORE BLOCK
5
////
6
////
7
////
8
//// This file is part of the APB to AES128 project
9
////
10
//// http://www.opencores.org/cores/apbtoaes128/
11
////
12
////
13
////
14
//// Description
15
////
16
//// Implementation of APB IP core according to
17
////
18
//// aes128_spec IP core specification document.
19
////
20
////
21
////
22
//// To Do: Things are right here but always all block can suffer changes
23
////
24
////
25
////
26
////
27
////
28
//// Author(s): - Felipe Fernandes Da Costa, fefe2560@gmail.com
29
////
30
///////////////////////////////////////////////////////////////// 
31
////
32
////
33
//// Copyright (C) 2009 Authors and OPENCORES.ORG
34
////
35
////
36
////
37
//// This source file may be used and distributed without
38
////
39
//// restriction provided that this copyright statement is not
40
////
41
//// removed from the file and that any derivative work contains
42
//// the original copyright notice and the associated disclaimer.
43
////
44
////
45
//// This source file is free software; you can redistribute it
46
////
47
//// and/or modify it under the terms of the GNU Lesser General
48
////
49
//// Public License as published by the Free Software Foundation;
50
//// either version 2.1 of the License, or (at your option) any
51
////
52
//// later version.
53
////
54
////
55
////
56
//// This source is distributed in the hope that it will be
57
////
58
//// useful, but WITHOUT ANY WARRANTY; without even the implied
59
////
60
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
61
////
62
//// PURPOSE. See the GNU Lesser General Public License for more
63
//// details.
64
////
65
////
66
////
67
//// You should have received a copy of the GNU Lesser General
68
////
69
//// Public License along with this source; if not, download it
70
////
71
//// from http://www.opencores.org/lgpl.shtml
72
////
73
////
74
///////////////////////////////////////////////////////////////////
75
static int aes_bfm_encryption_ecb_calltf(char*user_data)
76
{
77
 
78
        vpiHandle PRESETn = vpi_handle_by_name("AES_GLADIC_tb.PRESETn", NULL);
79
        vpiHandle PWDATA = vpi_handle_by_name("AES_GLADIC_tb.PWDATA", NULL);
80
        vpiHandle PENABLE = vpi_handle_by_name("AES_GLADIC_tb.PENABLE", NULL);
81
        vpiHandle PSEL = vpi_handle_by_name("AES_GLADIC_tb.PSEL", NULL);
82
        vpiHandle PWRITE = vpi_handle_by_name("AES_GLADIC_tb.PWRITE", NULL);
83
        vpiHandle PADDR = vpi_handle_by_name("AES_GLADIC_tb.PADDR", NULL);
84
        vpiHandle PRDATA = vpi_handle_by_name("AES_GLADIC_tb.PRDATA", NULL);
85
        vpiHandle PREADY = vpi_handle_by_name("AES_GLADIC_tb.PREADY", NULL);
86
        vpiHandle PSLVERR = vpi_handle_by_name("AES_GLADIC_tb.PSLVERR", NULL);
87
        vpiHandle int_ccf = vpi_handle_by_name("AES_GLADIC_tb.int_ccf", NULL);
88
        vpiHandle int_err = vpi_handle_by_name("AES_GLADIC_tb.int_err", NULL);
89
        vpiHandle dma_req_wr = vpi_handle_by_name("AES_GLADIC_tb.dma_req_wr", NULL);
90
        vpiHandle dma_req_rd = vpi_handle_by_name("AES_GLADIC_tb.dma_req_rd", NULL);
91
 
92
        std::random_device rd;
93
        std::uniform_int_distribution<long int> data_in(0,4294967295);
94
 
95
        v_ecb.format=vpiIntVal;
96
 
97
        vpi_get_value(PRESETn, &v_ecb);
98
 
99
 
100
        //printf("%i\n",STATE);
101
 
102
 
103
        if(type_bfm == ECB_ENCRYPTION && v_ecb.value.integer == 1)
104
        {
105
 
106
                switch(STATE)
107
                {
108
 
109
                  case IDLE:
110
 
111
                                if(PACKETS_GENERATED >= MAX_ITERATIONS)
112
                                {
113
 
114
                                        STATE = IDLE;
115
                                        type_bfm = 0;
116
 
117
                                }else
118
                                {
119
                                        STATE = WRITE;
120
 
121
                                        counter = 0;
122
 
123
 
124
                                        v_ecb.value.integer = 0;
125
                                        vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
126
 
127
                                        v_ecb.value.integer = vector_address[0];
128
                                        vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
129
 
130
                                        v_ecb.value.integer = 0;
131
                                        vpi_put_value(PWDATA, &v_ecb, NULL, vpiNoDelay);
132
 
133
                                        v_ecb.value.integer = 1;
134
                                        vpi_put_value(PWRITE, &v_ecb, NULL, vpiNoDelay);
135
 
136
                                        v_ecb.value.integer = 1;
137
                                        vpi_put_value(PSEL, &v_ecb, NULL, vpiNoDelay);
138
                                }
139
 
140
                  break;
141
 
142
                  case WRITE:
143
 
144
 
145
 
146
                        v_ecb.value.integer = 1;
147
                        vpi_put_value(PSEL, &v_ecb, NULL, vpiNoDelay);
148
 
149
                        if(counter == 0)
150
                        {
151
                                counter_write++;
152
                                counter++;
153
 
154
                                v_ecb.value.integer = 1;
155
                                vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
156
 
157
 
158
                        }else if(counter == 1)
159
                        {
160
 
161
 
162
 
163
                                t_ecb.type = vpiScaledRealTime;
164
                                t_ecb.real = 0;
165
                                v_ecb.format=vpiIntVal;
166
 
167
                                v_ecb.value.integer = 0;
168
                                vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
169
 
170
 
171
                                if(counter_write < 9)
172
                                {
173
 
174
                                        v_ecb.value.integer = vector_address[counter_write];
175
                                        vpi_put_value(PADDR, &v_ecb, &t_ecb, vpiTransportDelay);
176
 
177
                                        if(FIPS_ENABLE == FIPS)
178
                                        {
179
 
180
                                                if(vector_address[counter_write] == ADDR_AES_KEYR3 || vector_address[counter_write] == ADDR_AES_IVR3)
181
                                                {
182
                                                        a = a | KEY_FIPS_NOT_DERIVATED[0];
183
                                                        a = a << 8;
184
                                                        a = a | KEY_FIPS_NOT_DERIVATED[1];
185
                                                        a = a << 8;
186
                                                        a = a | KEY_FIPS_NOT_DERIVATED[2];
187
                                                        a = a << 8;
188
                                                        a = a | KEY_FIPS_NOT_DERIVATED[3];
189
                                                        v_ecb.value.integer = a;
190
                                                }
191
 
192
 
193
                                                if(vector_address[counter_write] == ADDR_AES_KEYR2 || vector_address[counter_write] == ADDR_AES_IVR2)
194
                                                {
195
                                                        b = b | KEY_FIPS_NOT_DERIVATED[4];
196
                                                        b = b << 8;
197
                                                        b = b | KEY_FIPS_NOT_DERIVATED[5];
198
                                                        b = b << 8;
199
                                                        b = b | KEY_FIPS_NOT_DERIVATED[6];
200
                                                        b = b << 8;
201
                                                        b = b | KEY_FIPS_NOT_DERIVATED[7];
202
                                                        v_ecb.value.integer = b;
203
                                                }
204
 
205
                                                if(vector_address[counter_write] == ADDR_AES_KEYR1 || vector_address[counter_write] == ADDR_AES_IVR1)
206
                                                {
207
 
208
                                                        c = c | KEY_FIPS_NOT_DERIVATED[8];
209
                                                        c = c << 8;
210
                                                        c = c | KEY_FIPS_NOT_DERIVATED[9];
211
                                                        c = c << 8;
212
                                                        c = c | KEY_FIPS_NOT_DERIVATED[10];
213
                                                        c = c << 8;
214
                                                        c = c | KEY_FIPS_NOT_DERIVATED[11];
215
                                                        v_ecb.value.integer = c;
216
 
217
                                                }
218
 
219
                                                if(vector_address[counter_write] == ADDR_AES_KEYR0 || vector_address[counter_write] == ADDR_AES_IVR0)
220
                                                {
221
                                                        d = d | KEY_FIPS_NOT_DERIVATED[12];
222
                                                        d = d << 8;
223
                                                        d = d | KEY_FIPS_NOT_DERIVATED[13];
224
                                                        d = d << 8;
225
                                                        d = d | KEY_FIPS_NOT_DERIVATED[14];
226
                                                        d = d << 8;
227
                                                        d = d | KEY_FIPS_NOT_DERIVATED[15];
228
                                                        v_ecb.value.integer = d;
229
                                                }
230
 
231
 
232
 
233
                                        }else if(FIPS_ENABLE == RANDOM_DATA)
234
                                        {
235
                                                v_ecb.value.integer = data_in(rd);
236
                                        }
237
 
238
                                        vpi_put_value(PWDATA, &v_ecb, &t_ecb, vpiTransportDelay);
239
 
240
 
241
                                        a = 0;
242
                                        b = 0;
243
                                        c = 0;
244
                                        d = 0;
245
 
246
 
247
 
248
                                }else if(counter_write == 9)//ENABLE CR
249
                                {
250
 
251 12 redbear
                                        if(DATATYPE == TYPE_00)// NO DINR DOUTR SWAP DATA
252
                                        {
253
                                                v_ecb.value.integer = ADDR_AES_CR;
254
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
255 4 redbear
 
256 12 redbear
                                                v_ecb.value.integer = 1;
257
                                                vpi_put_value(PWDATA, &v_ecb, &t_ecb, vpiTransportDelay);
258
 
259
                                        }else if(DATATYPE == TYPE_01)// 16 BIT DINR DOUTR SWAP DATA
260
                                        {
261
                                                v_ecb.value.integer = ADDR_AES_CR;
262
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
263
 
264
                                                v_ecb.value.integer = 3;
265
                                                vpi_put_value(PWDATA, &v_ecb, &t_ecb, vpiTransportDelay);
266
 
267
                                        }else if(DATATYPE == TYPE_02)// 8 BIT DINR DOUTR SWAP DATA
268
                                        {
269
                                                v_ecb.value.integer = ADDR_AES_CR;
270
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
271
 
272
                                                v_ecb.value.integer = 5;
273
                                                vpi_put_value(PWDATA, &v_ecb, &t_ecb, vpiTransportDelay);
274
 
275
                                        }else if(DATATYPE == TYPE_03)// BIT DINR DOUTR SWAP DATA
276
                                        {
277
                                                v_ecb.value.integer = ADDR_AES_CR;
278
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
279
 
280
                                                v_ecb.value.integer = 7;
281
                                                vpi_put_value(PWDATA, &v_ecb, &t_ecb, vpiTransportDelay);
282
                                        }
283 4 redbear
 
284
                                }else if(counter_write > 9  &&  counter_write < 14) //WRITE DINR
285
                                {
286
 
287
                                        v_ecb.value.integer = ADDR_AES_DINR;
288
                                        vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
289
 
290
 
291
                                        if(FIPS_ENABLE == FIPS)
292
                                        {
293
 
294 12 redbear
                                                if(DATATYPE == TYPE_00)
295 4 redbear
                                                {
296
 
297 12 redbear
                                                        if(counter_write == 10)
298
                                                        {
299
                                                                a = a | TEXT_FIPS_NOT_DERIVATED[0];
300
                                                                a = a << 8;
301
                                                                a = a | TEXT_FIPS_NOT_DERIVATED[1];
302
                                                                a = a << 8;
303
                                                                a = a | TEXT_FIPS_NOT_DERIVATED[2];
304
                                                                a = a << 8;
305
                                                                a = a | TEXT_FIPS_NOT_DERIVATED[3];
306
                                                                v_ecb.value.integer = a;
307 4 redbear
 
308 12 redbear
                                                        }else if(counter_write == 11)
309
                                                        {
310
                                                                b = b | TEXT_FIPS_NOT_DERIVATED[4];
311
                                                                b = b << 8;
312
                                                                b = b | TEXT_FIPS_NOT_DERIVATED[5];
313
                                                                b = b << 8;
314
                                                                b = b | TEXT_FIPS_NOT_DERIVATED[6];
315
                                                                b = b << 8;
316
                                                                b = b | TEXT_FIPS_NOT_DERIVATED[7];
317
                                                                v_ecb.value.integer = b;
318 4 redbear
 
319 12 redbear
                                                        }else if(counter_write == 12 )
320
                                                        {
321 4 redbear
 
322 12 redbear
                                                                c = c | TEXT_FIPS_NOT_DERIVATED[8];
323
                                                                c = c << 8;
324
                                                                c = c | TEXT_FIPS_NOT_DERIVATED[9];
325
                                                                c = c << 8;
326
                                                                c = c | TEXT_FIPS_NOT_DERIVATED[10];
327
                                                                c = c << 8;
328
                                                                c = c | TEXT_FIPS_NOT_DERIVATED[11];
329
                                                                v_ecb.value.integer = c;
330
 
331
                                                        }else if(counter_write == 13 )
332
                                                        {
333
                                                                d = d | TEXT_FIPS_NOT_DERIVATED[12];
334
                                                                d = d << 8;
335
                                                                d = d | TEXT_FIPS_NOT_DERIVATED[13];
336
                                                                d = d << 8;
337
                                                                d = d | TEXT_FIPS_NOT_DERIVATED[14];
338
                                                                d = d << 8;
339
                                                                d = d | TEXT_FIPS_NOT_DERIVATED[15];
340
                                                                v_ecb.value.integer = d;
341
 
342
                                                        }
343
 
344
                                                }else if(DATATYPE > TYPE_00)
345 4 redbear
                                                {
346
 
347 12 redbear
 
348
                                                        if(counter_write == 10)
349
                                                        {
350
                                                                a = a | TEXT_FIPS_NOT_DATATYPE_DERIVATED[0];
351
                                                                a = a << 8;
352
                                                                a = a | TEXT_FIPS_NOT_DATATYPE_DERIVATED[1];
353
                                                                a = a << 8;
354
                                                                a = a | TEXT_FIPS_NOT_DATATYPE_DERIVATED[2];
355
                                                                a = a << 8;
356
                                                                a = a | TEXT_FIPS_NOT_DATATYPE_DERIVATED[3];
357
                                                                v_ecb.value.integer = a;
358
 
359
                                                        }else if(counter_write == 11)
360
                                                        {
361
                                                                b = b | TEXT_FIPS_NOT_DATATYPE_DERIVATED[4];
362
                                                                b = b << 8;
363
                                                                b = b | TEXT_FIPS_NOT_DATATYPE_DERIVATED[5];
364
                                                                b = b << 8;
365
                                                                b = b | TEXT_FIPS_NOT_DATATYPE_DERIVATED[6];
366
                                                                b = b << 8;
367
                                                                b = b | TEXT_FIPS_NOT_DATATYPE_DERIVATED[7];
368
                                                                v_ecb.value.integer = b;
369
 
370
                                                        }else if(counter_write == 12 )
371
                                                        {
372
 
373
                                                                c = c | TEXT_FIPS_NOT_DATATYPE_DERIVATED[8];
374
                                                                c = c << 8;
375
                                                                c = c | TEXT_FIPS_NOT_DATATYPE_DERIVATED[9];
376
                                                                c = c << 8;
377
                                                                c = c | TEXT_FIPS_NOT_DATATYPE_DERIVATED[10];
378
                                                                c = c << 8;
379
                                                                c = c | TEXT_FIPS_NOT_DATATYPE_DERIVATED[11];
380
                                                                v_ecb.value.integer = c;
381
 
382
                                                        }else if(counter_write == 13 )
383
                                                        {
384
                                                                d = d | TEXT_FIPS_NOT_DATATYPE_DERIVATED[12];
385
                                                                d = d << 8;
386
                                                                d = d | TEXT_FIPS_NOT_DATATYPE_DERIVATED[13];
387
                                                                d = d << 8;
388
                                                                d = d | TEXT_FIPS_NOT_DATATYPE_DERIVATED[14];
389
                                                                d = d << 8;
390
                                                                d = d | TEXT_FIPS_NOT_DATATYPE_DERIVATED[15];
391
                                                                v_ecb.value.integer = d;
392
 
393
                                                        }
394
 
395 4 redbear
                                                }
396
 
397
 
398
                                        }else if(FIPS_ENABLE == RANDOM_DATA)
399
                                        {
400
                                                v_ecb.value.integer = data_in(rd);
401
                                        }
402
 
403 12 redbear
                                        vpi_put_value(PWDATA, &v_ecb, NULL, vpiNoDelay);
404
 
405
                                        //vpi_put_value(PWDATA, &v_ecb, &t_ecb, vpiTransportDelay);
406 4 redbear
 
407
                                        a = 0;
408
                                        b = 0;
409
                                        c = 0;
410
                                        d = 0;
411
 
412
 
413
                                }
414
                                        counter=0;
415
 
416
                        }
417
 
418
 
419
 
420
                                if(counter_write == 14)
421
                                {
422
                                        counter_write = 0;
423
                                        STATE = WAIT_SR;
424 12 redbear
 
425
 
426 4 redbear
                                }
427
 
428
                  break;
429
 
430
                  case WAIT_SR:
431
 
432 12 redbear
 
433 4 redbear
                                v_ecb.value.integer = ADDR_AES_SR;
434
                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
435
 
436
                                v_ecb.value.integer = 0;
437
                                vpi_put_value(PWRITE, &v_ecb, NULL, vpiNoDelay);
438
 
439
                                if(counter == 0)
440
                                {
441
 
442
                                        counter++;
443
 
444
                                        v_ecb.value.integer = 1;
445
                                        vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
446
 
447
 
448 9 redbear
                                        v_ecb.value.integer = 0;
449
                                        vpi_get_value(PRDATA,&v_ecb);
450
 
451
 
452
                                        if(v_ecb.value.integer == 1)
453
                                        {
454
                                                STATE = READ_DOUTR;
455
 
456
                                                //printf("CYCLES TAKEN:%d\n", cycle_counter);
457
                                                cycle_counter=0;
458
                                                //t_ecb.type = vpiScaledRealTime;
459
                                                //t_ecb.real = 0;
460
                                                //v_ecb.format=vpiIntVal;
461
                                                //v_ecb.value.integer = ADDR_AES_DOUTR;
462
                                                //vpi_put_value(PADDR, &v_ecb, &t_ecb, vpiTransportDelay);
463
                                        }
464
 
465
 
466 4 redbear
                                }else if(counter == 1)
467
                                {
468
                                        v_ecb.value.integer = 0;
469
                                        vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
470
 
471
                                        counter=0;
472
                                }
473
 
474
 
475 9 redbear
                        //cycle_counter++;
476 4 redbear
 
477
                  break;
478
 
479
 
480
                 case READ_DOUTR:
481
 
482
 
483
 
484
                                if(counter == 0)
485
                                {
486
 
487
                                        v_ecb.value.integer = 1;
488
                                        vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
489
 
490 5 redbear
                                        counter_read++;
491 4 redbear
                                        counter++;
492
 
493
 
494
 
495
                                }else if(counter == 1)
496
                                {
497
                                        v_ecb.value.integer = 0;
498
                                        vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
499
 
500 5 redbear
 
501
                                        if(counter_read < 4)
502
                                        {
503
 
504
                                                v_ecb.value.integer = ADDR_AES_DOUTR;
505
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
506
 
507
                                        }
508
 
509
 
510
                                        if(counter_read == 4)
511
                                        {
512
 
513
                                                v_ecb.value.integer = ADDR_AES_KEYR3;
514
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
515
 
516
                                        }
517
 
518
 
519
                                        if(counter_read == 5)
520
                                        {
521
 
522
                                                v_ecb.value.integer = ADDR_AES_KEYR2;
523
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
524
 
525
                                        }
526
 
527
 
528
 
529
                                        if(counter_read == 6)
530
                                        {
531
 
532
                                                v_ecb.value.integer = ADDR_AES_KEYR1;
533
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
534
 
535
                                        }
536
 
537
 
538
                                        if(counter_read == 7)
539
                                        {
540
 
541
                                                v_ecb.value.integer = ADDR_AES_KEYR0;
542
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
543
 
544
                                        }
545
 
546
 
547
                                        if(counter_read == 8)
548
                                        {
549
 
550
                                                v_ecb.value.integer = ADDR_AES_IVR3;
551
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
552
 
553
                                        }
554
 
555
 
556
                                        if(counter_read == 9)
557
                                        {
558
 
559
                                                v_ecb.value.integer = ADDR_AES_IVR2;
560
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
561
 
562
                                        }
563
 
564
 
565
 
566
                                        if(counter_read == 10)
567
                                        {
568
 
569
                                                v_ecb.value.integer = ADDR_AES_IVR1;
570
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
571
 
572
                                        }
573
 
574
 
575
                                        if(counter_read == 11)
576
                                        {
577
 
578
                                                v_ecb.value.integer = ADDR_AES_IVR0;
579
                                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
580
 
581
                                        }
582
 
583
 
584 4 redbear
                                        counter = 0;
585
                                }
586
 
587 5 redbear
                                if(counter_read == 12)
588 4 redbear
                                {
589
                                        STATE = RESET_SR;
590 5 redbear
                                        counter_read = 0;
591 4 redbear
                                }
592
 
593
                 break;
594
 
595
                case RESET_SR:
596
 
597
                                v_ecb.value.integer = 1;
598
                                vpi_put_value(PWRITE, &v_ecb, NULL, vpiNoDelay);
599
 
600
                                v_ecb.value.integer = 1;
601
                                vpi_put_value(PSEL, &v_ecb, NULL, vpiNoDelay);
602
 
603
                                v_ecb.value.integer = 0;
604
                                vpi_put_value(PADDR, &v_ecb, NULL, vpiNoDelay);
605
 
606
                                v_ecb.value.integer = 128;
607
                                vpi_put_value(PWDATA, &v_ecb, NULL, vpiNoDelay);
608
 
609
 
610
                                if(counter == 0)
611
                                {
612
 
613
                                        counter_write++;
614
                                        counter++;
615
 
616
                                        v_ecb.value.integer = 1;
617
                                        vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
618
 
619
                                }else if(counter == 1)
620
                                {
621
 
622
                                        v_ecb.value.integer = 0;
623
                                        vpi_put_value(PENABLE, &v_ecb, NULL, vpiNoDelay);
624
                                        counter=0;
625
 
626
                                }
627
 
628
                                if(counter_write == 1)
629
                                {
630
                                        STATE =IDLE;
631
                                        counter_write = 0;
632
                                        counter=0;
633
 
634
                                        PACKETS_GENERATED = PACKETS_GENERATED + 1;
635
                                }
636
 
637
 
638
 
639
                break;
640
 
641
                }
642
 
643
        }
644
 
645
        return 0;
646
}

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