summaryrefslogtreecommitdiffstats
path: root/package/platform/lantiq/ltq-deu/src/ifxmips_des.c
blob: dcf6c18a98748768f69bc1b7905e23e708429441 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
/******************************************************************************
**
** FILE NAME    : ifxmips_des.c
** PROJECT      : IFX UEIP
** MODULES      : DEU Module
**
** DATE         : September 8, 2009
** AUTHOR       : Mohammad Firdaus
** DESCRIPTION  : Data Encryption Unit Driver for DES Algorithm
** COPYRIGHT    :       Copyright (c) 2009
**                      Infineon Technologies AG
**                      Am Campeon 1-12, 85579 Neubiberg, Germany
**
**    This program is free software; you can redistribute it and/or modify
**    it under the terms of the GNU General Public License as published by
**    the Free Software Foundation; either version 2 of the License, or
**    (at your option) any later version.
**
** HISTORY
** $Date        $Author             $Comment
** 08 Sept 2009 Mohammad Firdaus    Initial UEIP release
*******************************************************************************/

/*!
  \defgroup IFX_DEU IFX_DEU_DRIVERS
  \ingroup API
  \brief ifx deu driver
*/

/*!
  \file		ifxmips_des.c
  \ingroup 	IFX_DEU
  \brief 	DES encryption DEU driver file
*/

/*!
  \defgroup IFX_DES_FUNCTIONS IFX_DES_FUNCTIONS
  \ingroup IFX_DEU
  \brief IFX DES Encryption functions
*/

/* Project Header Files */
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/crypto.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <asm/byteorder.h>
#include <crypto/algapi.h>
#include "ifxmips_deu.h"

#if defined(CONFIG_DANUBE) 
#include "ifxmips_deu_danube.h"
extern int ifx_danube_pre_1_4;
#elif defined(CONFIG_AR9)
#include "ifxmips_deu_ar9.h"
#elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
#include "ifxmips_deu_vr9.h"
#else
#error "Unkown platform"
#endif

/* DMA specific header and variables */

#if 0
     #define CRTCL_SECT_INIT        
     #define CRTCL_SECT_START        
     #define CRTCL_SECT_END         
#else
spinlock_t des_lock;
#define CRTCL_SECT_INIT        spin_lock_init(&des_lock)
#define CRTCL_SECT_START       spin_lock_irqsave(&des_lock, flag)
#define CRTCL_SECT_END         spin_unlock_irqrestore(&des_lock, flag)
#endif

/* Preprocessor declerations */
#ifdef CRYPTO_DEBUG
extern char debug_level;
#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
#else
#define DPRINTF(level, format, args...)
#endif
#define DES_3DES_START  IFX_DES_CON
#define DES_KEY_SIZE            8
#define DES_EXPKEY_WORDS        32
#define DES_BLOCK_SIZE          8
#define DES3_EDE_KEY_SIZE       (3 * DES_KEY_SIZE)
#define DES3_EDE_EXPKEY_WORDS   (3 * DES_EXPKEY_WORDS)
#define DES3_EDE_BLOCK_SIZE     DES_BLOCK_SIZE

/* Function Declaration to prevent warning messages */
void des_chip_init (void);
u32 endian_swap(u32 input);
u32 input_swap(u32 input);
int aes_memory_allocate(int value);
int des_memory_allocate(int value);
void memory_release(u32 *buffer);
u32* memory_alignment(const u8 *arg, u32 *buff_alloc, int in_out, int nbytes);
void aes_dma_memory_copy(u32 *outcopy, u32 *out_dma, u8 *out_arg, int nbytes);
void des_dma_memory_copy(u32 *outcopy, u32 *out_dma, u8 *out_arg, int nbytes);

void ifx_deu_des (void *ctx_arg, u8 *out_arg, const u8 *in_arg,
             u8 *iv_arg, u32 nbytes, int encdec, int mode);

struct des_ctx {
        int controlr_M;
        int key_length;
        u8 iv[DES_BLOCK_SIZE];
        u32 expkey[DES3_EDE_EXPKEY_WORDS];
};

extern int disable_multiblock;
extern int disable_deudma;


/*! \fn	int des_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief sets DES key   
 *  \param tfm linux crypto algo transform  
 *  \param key input key  
 *  \param keylen key length  
*/                                 
int des_setkey(struct crypto_tfm *tfm, const u8 *key,
                      unsigned int keylen)
{
        struct des_ctx *dctx = crypto_tfm_ctx(tfm);

        //printk("setkey in %s\n", __FILE__);

        dctx->controlr_M = 0;   // des
        dctx->key_length = keylen;

        memcpy ((u8 *) (dctx->expkey), key, keylen);

        return 0;
}


/*! \fn void ifx_deu_des(void *ctx_arg, u8 *out_arg, const u8 *in_arg, u8 *iv_arg, u32 nbytes, int encdec, int mode)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief main interface to DES hardware   
 *  \param ctx_arg crypto algo context  
 *  \param out_arg output bytestream  
 *  \param in_arg input bytestream   
 *  \param iv_arg initialization vector  
 *  \param nbytes length of bytestream  
 *  \param encdec 1 for encrypt; 0 for decrypt  
 *  \param mode operation mode such as ebc, cbc 
*/                                 

void ifx_deu_des (void *ctx_arg, u8 *out_arg, const u8 *in_arg,
             u8 *iv_arg, u32 nbytes, int encdec, int mode)
{
        volatile struct des_t *des = (struct des_t *) DES_3DES_START;
        struct des_ctx *dctx = ctx_arg;
        u32 *key = dctx->expkey;
        unsigned long flag;

        int i = 0;
        int nblocks = 0;
        
        CRTCL_SECT_START;

        des->controlr.M = dctx->controlr_M;
        if (dctx->controlr_M == 0)      // des
        {
                des->K1HR = DEU_ENDIAN_SWAP(*((u32 *) key + 0));
                des->K1LR = DEU_ENDIAN_SWAP(*((u32 *) key + 1));

        }
        else {
                /* Hardware Section */
                switch (dctx->key_length) {
                case 24:
                        des->K3HR = DEU_ENDIAN_SWAP(*((u32 *) key + 4));
                        des->K3LR = DEU_ENDIAN_SWAP(*((u32 *) key + 5));
                        /* no break; */

                case 16:
                        des->K2HR = DEU_ENDIAN_SWAP(*((u32 *) key + 2));
                        des->K2LR = DEU_ENDIAN_SWAP(*((u32 *) key + 3));

                        /* no break; */
                case 8:
                        des->K1HR = DEU_ENDIAN_SWAP(*((u32 *) key + 0));
                        des->K1LR = DEU_ENDIAN_SWAP(*((u32 *) key + 1));
                        break;

                default:
                        CRTCL_SECT_END;
                        return;
                }
        }

        des->controlr.E_D = !encdec;    //encryption
        des->controlr.O = mode; //0 ECB 1 CBC 2 OFB 3 CFB 4 CTR hexdump(prin,sizeof(*des));

        if (mode > 0) {
                des->IVHR = DEU_ENDIAN_SWAP(*(u32 *) iv_arg);
                des->IVLR = DEU_ENDIAN_SWAP(*((u32 *) iv_arg + 1));
        };

        nblocks = nbytes / 4;

        for (i = 0; i < nblocks; i += 2) {
                /* wait for busy bit to clear */

                /*--- Workaround ----------------------------------------------------
                do a dummy read to the busy flag because it is not raised early
                enough in CFB/OFB 3DES modes */
#ifdef CRYPTO_DEBUG
                printk ("ihr: %x\n", (*((u32 *) in_arg + i)));
                printk ("ilr: %x\n", (*((u32 *) in_arg + 1 + i)));
#endif           
                des->IHR = INPUT_ENDIAN_SWAP(*((u32 *) in_arg + i));
                des->ILR = INPUT_ENDIAN_SWAP(*((u32 *) in_arg + 1 + i)); /* start crypto */
                
                while (des->controlr.BUS) {
                        // this will not take long
                }

                *((u32 *) out_arg + 0 + i) = des->OHR;
                *((u32 *) out_arg + 1 + i) = des->OLR;

        }


    
    if (mode > 0) {
        *(u32 *) iv_arg = DEU_ENDIAN_SWAP(des->IVHR);
        *((u32 *) iv_arg + 1) = DEU_ENDIAN_SWAP(des->IVLR);
    };

    CRTCL_SECT_END;
}

//definitions from linux/include/crypto.h:
//#define CRYPTO_TFM_MODE_ECB           0x00000001
//#define CRYPTO_TFM_MODE_CBC           0x00000002
//#define CRYPTO_TFM_MODE_CFB           0x00000004
//#define CRYPTO_TFM_MODE_CTR           0x00000008
//#define CRYPTO_TFM_MODE_OFB           0x00000010 // not even defined
//but hardware definition: 0 ECB 1 CBC 2 OFB 3 CFB 4 CTR

/*! \fn void ifx_deu_des(void *ctx_arg, u8 *out_arg, const u8 *in_arg, u8 *iv_arg, u32 nbytes, int encdec, int mode)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief main interface to DES hardware   
 *  \param ctx_arg crypto algo context  
 *  \param out_arg output bytestream  
 *  \param in_arg input bytestream   
 *  \param iv_arg initialization vector  
 *  \param nbytes length of bytestream  
 *  \param encdec 1 for encrypt; 0 for decrypt  
 *  \param mode operation mode such as ebc, cbc 
*/   



/*! \fn  void ifx_deu_des_ecb (void *ctx, uint8_t *dst, const uint8_t *src, uint8_t *iv, size_t nbytes, int encdec, int inplace)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief sets DES hardware to ECB mode   
 *  \param ctx crypto algo context  
 *  \param dst output bytestream  
 *  \param src input bytestream  
 *  \param iv initialization vector   
 *  \param nbytes length of bytestream  
 *  \param encdec 1 for encrypt; 0 for decrypt  
 *  \param inplace not used  
*/
    
void ifx_deu_des_ecb (void *ctx, uint8_t *dst, const uint8_t *src,
                uint8_t *iv, size_t nbytes, int encdec, int inplace)
{
     ifx_deu_des (ctx, dst, src, NULL, nbytes, encdec, 0);
}

/*! \fn  void ifx_deu_des_cbc (void *ctx, uint8_t *dst, const uint8_t *src, uint8_t *iv, size_t nbytes, int encdec, int inplace)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief sets DES hardware to CBC mode   
 *  \param ctx crypto algo context  
 *  \param dst output bytestream  
 *  \param src input bytestream  
 *  \param iv initialization vector   
 *  \param nbytes length of bytestream  
 *  \param encdec 1 for encrypt; 0 for decrypt  
 *  \param inplace not used  
*/                                 
void ifx_deu_des_cbc (void *ctx, uint8_t *dst, const uint8_t *src,
                uint8_t *iv, size_t nbytes, int encdec, int inplace)
{
     ifx_deu_des (ctx, dst, src, iv, nbytes, encdec, 1);
}

/*! \fn  void ifx_deu_des_ofb (void *ctx, uint8_t *dst, const uint8_t *src, uint8_t *iv, size_t nbytes, int encdec, int inplace)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief sets DES hardware to OFB mode   
 *  \param ctx crypto algo context  
 *  \param dst output bytestream  
 *  \param src input bytestream  
 *  \param iv initialization vector   
 *  \param nbytes length of bytestream  
 *  \param encdec 1 for encrypt; 0 for decrypt  
 *  \param inplace not used  
*/                                 
void ifx_deu_des_ofb (void *ctx, uint8_t *dst, const uint8_t *src,
                uint8_t *iv, size_t nbytes, int encdec, int inplace)
{
     ifx_deu_des (ctx, dst, src, iv, nbytes, encdec, 2);
}

/*! \fn void ifx_deu_des_cfb (void *ctx, uint8_t *dst, const uint8_t *src, uint8_t *iv, size_t nbytes, int encdec, int inplace)
    \ingroup IFX_DES_FUNCTIONS
    \brief sets DES hardware to CFB mode   
    \param ctx crypto algo context  
    \param dst output bytestream  
    \param src input bytestream  
    \param iv initialization vector   
    \param nbytes length of bytestream  
    \param encdec 1 for encrypt; 0 for decrypt  
    \param inplace not used  
*/                                 
void ifx_deu_des_cfb (void *ctx, uint8_t *dst, const uint8_t *src,
                uint8_t *iv, size_t nbytes, int encdec, int inplace)
{
     ifx_deu_des (ctx, dst, src, iv, nbytes, encdec, 3);
}

/*! \fn void ifx_deu_des_ctr (void *ctx, uint8_t *dst, const uint8_t *src, uint8_t *iv, size_t nbytes, int encdec, int inplace)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief sets DES hardware to CTR mode   
 *  \param ctx crypto algo context  
 *  \param dst output bytestream  
 *  \param src input bytestream  
 *  \param iv initialization vector   
 *  \param nbytes length of bytestream  
 *  \param encdec 1 for encrypt; 0 for decrypt  
 *  \param inplace not used  
*/                                 
void ifx_deu_des_ctr (void *ctx, uint8_t *dst, const uint8_t *src,
                uint8_t *iv, size_t nbytes, int encdec, int inplace)
{
     ifx_deu_des (ctx, dst, src, iv, nbytes, encdec, 4);
}

/*! \fn void des_encrypt (struct crypto_tfm *tfm, uint8_t *out, const uint8_t *in)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief encrypt DES_BLOCK_SIZE of data   
 *  \param tfm linux crypto algo transform  
 *  \param out output bytestream  
 *  \param in input bytestream  
*/                                               
void des_encrypt (struct crypto_tfm *tfm, uint8_t * out, const uint8_t * in)
{
     struct des_ctx *ctx = crypto_tfm_ctx(tfm);
     ifx_deu_des (ctx, out, in, NULL, DES_BLOCK_SIZE,
                    CRYPTO_DIR_ENCRYPT, 0);

}

/*! \fn void des_decrypt (struct crypto_tfm *tfm, uint8_t *out, const uint8_t *in)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief encrypt DES_BLOCK_SIZE of data   
 *  \param tfm linux crypto algo transform  
 *  \param out output bytestream  
 *  \param in input bytestream  
*/                                               
void des_decrypt (struct crypto_tfm *tfm, uint8_t * out, const uint8_t * in)
{
     struct des_ctx *ctx = crypto_tfm_ctx(tfm);
     ifx_deu_des (ctx, out, in, NULL, DES_BLOCK_SIZE,
                    CRYPTO_DIR_DECRYPT, 0);
}

/*
 *   \brief RFC2451:
 *
 *   For DES-EDE3, there is no known need to reject weak or
 *   complementation keys.  Any weakness is obviated by the use of
 *   multiple keys.
 *
 *   However, if the first two or last two independent 64-bit keys are
 *   equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
 *   same as DES.  Implementers MUST reject keys that exhibit this
 *   property.
 *
 */

/*! \fn int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief sets 3DES key   
 *  \param tfm linux crypto algo transform  
 *  \param key input key  
 *  \param keylen key length  
*/                                 
int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
                    unsigned int keylen)
{
        struct des_ctx *dctx = crypto_tfm_ctx(tfm);

        //printk("setkey in %s\n", __FILE__);

        dctx->controlr_M = keylen / 8 + 1;      // 3DES EDE1 / EDE2 / EDE3 Mode
        dctx->key_length = keylen;

        memcpy ((u8 *) (dctx->expkey), key, keylen);

        return 0;
}

/*
 * \brief DES function mappings
*/ 
struct crypto_alg ifxdeu_des_alg = {
        .cra_name               =       "des",
        .cra_driver_name        =       "ifxdeu-des",
        .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
        .cra_blocksize          =       DES_BLOCK_SIZE,
        .cra_ctxsize            =       sizeof(struct des_ctx),
        .cra_module             =       THIS_MODULE,
        .cra_alignmask          =       3,
        .cra_list               =       LIST_HEAD_INIT(ifxdeu_des_alg.cra_list),
        .cra_u                  =       { .cipher = {
        .cia_min_keysize        =       DES_KEY_SIZE,
        .cia_max_keysize        =       DES_KEY_SIZE,
        .cia_setkey             =       des_setkey,
        .cia_encrypt            =       des_encrypt,
        .cia_decrypt            =       des_decrypt } }
};

/*
 * \brief DES function mappings
*/ 
struct crypto_alg ifxdeu_des3_ede_alg = {
        .cra_name               =       "des3_ede",
        .cra_driver_name        =       "ifxdeu-des3_ede",
        .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
        .cra_blocksize          =       DES_BLOCK_SIZE,
        .cra_ctxsize            =       sizeof(struct des_ctx),
        .cra_module             =       THIS_MODULE,
        .cra_alignmask          =       3,
        .cra_list               =       LIST_HEAD_INIT(ifxdeu_des3_ede_alg.cra_list),
        .cra_u                  =       { .cipher = {
        .cia_min_keysize        =       DES_KEY_SIZE,
        .cia_max_keysize        =       DES_KEY_SIZE,
        .cia_setkey             =       des3_ede_setkey,
        .cia_encrypt            =       des_encrypt,
        .cia_decrypt            =       des_decrypt } }
};

/*! \fn int ecb_des_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief ECB DES encrypt using linux crypto blkcipher    
 *  \param desc blkcipher descriptor  
 *  \param dst output scatterlist  
 *  \param src input scatterlist  
 *  \param nbytes data size in bytes  
*/                                 
int ecb_des_encrypt(struct blkcipher_desc *desc,
                    struct scatterlist *dst, struct scatterlist *src,
                    unsigned int nbytes)
{
        struct des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
        struct blkcipher_walk walk;
        int err;

        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt(desc, &walk);

        while ((nbytes = walk.nbytes)) {
                nbytes -= (nbytes % DES_BLOCK_SIZE); 
                ifx_deu_des_ecb(ctx, walk.dst.virt.addr, walk.src.virt.addr, 
                               NULL, nbytes, CRYPTO_DIR_ENCRYPT, 0);
                nbytes &= DES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }

        return err;
}

/*! \fn int ecb_des_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief ECB DES decrypt using linux crypto blkcipher    
 *  \param desc blkcipher descriptor  
 *  \param dst output scatterlist  
 *  \param src input scatterlist  
 *  \param nbytes data size in bytes  
 *  \return err
*/                                 
int ecb_des_decrypt(struct blkcipher_desc *desc,
                    struct scatterlist *dst, struct scatterlist *src,
                    unsigned int nbytes)
{
        struct des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
        struct blkcipher_walk walk;
        int err;

        DPRINTF(1, "\n");
        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt(desc, &walk);

        while ((nbytes = walk.nbytes)) {
                nbytes -= (nbytes % DES_BLOCK_SIZE); 
                ifx_deu_des_ecb(ctx, walk.dst.virt.addr, walk.src.virt.addr, 
                               NULL, nbytes, CRYPTO_DIR_DECRYPT, 0);
                nbytes &= DES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }

        return err;
}

/*
 * \brief DES function mappings
*/ 
struct crypto_alg ifxdeu_ecb_des_alg = {
        .cra_name               =       "ecb(des)",
        .cra_driver_name        =       "ifxdeu-ecb(des)",
        .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
        .cra_blocksize          =       DES_BLOCK_SIZE,
        .cra_ctxsize            =       sizeof(struct des_ctx),
        .cra_type               =       &crypto_blkcipher_type,
        .cra_module             =       THIS_MODULE,
        .cra_list               =       LIST_HEAD_INIT(ifxdeu_ecb_des_alg.cra_list),
        .cra_u                  =       {
                .blkcipher = {
                        .min_keysize            =       DES_KEY_SIZE,
                        .max_keysize            =       DES_KEY_SIZE,
                        .setkey                 =       des_setkey,
                        .encrypt                =       ecb_des_encrypt,
                        .decrypt                =       ecb_des_decrypt,
                }
        }
};

/*
 * \brief DES function mappings
*/ 
struct crypto_alg ifxdeu_ecb_des3_ede_alg = {
        .cra_name               =       "ecb(des3_ede)",
        .cra_driver_name        =       "ifxdeu-ecb(des3_ede)",
        .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
        .cra_blocksize          =       DES3_EDE_BLOCK_SIZE,
        .cra_ctxsize            =       sizeof(struct des_ctx),
        .cra_type               =       &crypto_blkcipher_type,
        .cra_module             =       THIS_MODULE,
        .cra_list               =       LIST_HEAD_INIT(ifxdeu_ecb_des3_ede_alg.cra_list),
        .cra_u                  =       {
                .blkcipher = {
                        .min_keysize            =       DES3_EDE_KEY_SIZE,
                        .max_keysize            =       DES3_EDE_KEY_SIZE,
                        .setkey                 =       des3_ede_setkey,
                        .encrypt                =       ecb_des_encrypt,
                        .decrypt                =       ecb_des_decrypt,
                }
        }
};

/*! \fn int cbc_des_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief CBC DES encrypt using linux crypto blkcipher    
 *  \param desc blkcipher descriptor  
 *  \param dst output scatterlist  
 *  \param src input scatterlist  
 *  \param nbytes data size in bytes  
 *  \return err
*/                                 
int cbc_des_encrypt(struct blkcipher_desc *desc,
                    struct scatterlist *dst, struct scatterlist *src,
                    unsigned int nbytes)
{
        struct des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
        struct blkcipher_walk walk;
        int err;

        DPRINTF(1, "\n");
        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt(desc, &walk);

        while ((nbytes = walk.nbytes)) {
                u8 *iv = walk.iv;
                nbytes -= (nbytes % DES_BLOCK_SIZE); 
                ifx_deu_des_cbc(ctx, walk.dst.virt.addr, walk.src.virt.addr, 
                               iv, nbytes, CRYPTO_DIR_ENCRYPT, 0);      
                nbytes &= DES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }

        return err;
}

/*! \fn int cbc_des_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief CBC DES decrypt using linux crypto blkcipher    
 *  \param desc blkcipher descriptor  
 *  \param dst output scatterlist  
 *  \param src input scatterlist  
 *  \param nbytes data size in bytes  
 *  \return err
*/                                 
int cbc_des_decrypt(struct blkcipher_desc *desc,
                    struct scatterlist *dst, struct scatterlist *src,
                    unsigned int nbytes)
{
        struct des_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
        struct blkcipher_walk walk;
        int err;

        DPRINTF(1, "\n");
        blkcipher_walk_init(&walk, dst, src, nbytes);
        err = blkcipher_walk_virt(desc, &walk);

        while ((nbytes = walk.nbytes)) {
                u8 *iv = walk.iv;
                nbytes -= (nbytes % DES_BLOCK_SIZE); 
                ifx_deu_des_cbc(ctx, walk.dst.virt.addr, walk.src.virt.addr, 
                               iv, nbytes, CRYPTO_DIR_DECRYPT, 0);
                nbytes &= DES_BLOCK_SIZE - 1;
                err = blkcipher_walk_done(desc, &walk, nbytes);
        }

        return err;
}

/*
 * \brief DES function mappings
*/ 
struct crypto_alg ifxdeu_cbc_des_alg = {
        .cra_name               =       "cbc(des)",
        .cra_driver_name        =       "ifxdeu-cbc(des)",
        .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
        .cra_blocksize          =       DES_BLOCK_SIZE,
        .cra_ctxsize            =       sizeof(struct des_ctx),
        .cra_type               =       &crypto_blkcipher_type,
        .cra_module             =       THIS_MODULE,
        .cra_list               =       LIST_HEAD_INIT(ifxdeu_cbc_des_alg.cra_list),
        .cra_u                  =       {
                .blkcipher = {
                        .min_keysize            =       DES_KEY_SIZE,
                        .max_keysize            =       DES_KEY_SIZE,
                        .ivsize                 =       DES_BLOCK_SIZE,
                        .setkey                 =       des_setkey,
                        .encrypt                =       cbc_des_encrypt,
                        .decrypt                =       cbc_des_decrypt,
                }
        }
};

/*
 * \brief DES function mappings
*/ 
struct crypto_alg ifxdeu_cbc_des3_ede_alg = {
        .cra_name               =       "cbc(des3_ede)",
        .cra_driver_name        =       "ifxdeu-cbc(des3_ede)",
        .cra_flags              =       CRYPTO_ALG_TYPE_BLKCIPHER,
        .cra_blocksize          =       DES3_EDE_BLOCK_SIZE,
        .cra_ctxsize            =       sizeof(struct des_ctx),
        .cra_type               =       &crypto_blkcipher_type,
        .cra_module             =       THIS_MODULE,
        .cra_list               =       LIST_HEAD_INIT(ifxdeu_cbc_des3_ede_alg.cra_list),
        .cra_u                  =       {
                .blkcipher = {
                        .min_keysize            =       DES3_EDE_KEY_SIZE,
                        .max_keysize            =       DES3_EDE_KEY_SIZE,
                        .ivsize                 =       DES_BLOCK_SIZE,
                        .setkey                 =       des3_ede_setkey,
                        .encrypt                =       cbc_des_encrypt,
                        .decrypt                =       cbc_des_decrypt,
                }
        }
};

/*! \fn int __init ifxdeu_init_des (void)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief initialize des driver      
*/                                 
int __init ifxdeu_init_des (void)
{
    int ret = -ENOSYS;


#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20))
     if (!disable_multiblock) {
                ifxdeu_des_alg.cra_u.cipher.cia_max_nbytes = DES_BLOCK_SIZE;    //(size_t)-1;
                ifxdeu_des_alg.cra_u.cipher.cia_req_align = 16;
                ifxdeu_des_alg.cra_u.cipher.cia_ecb = ifx_deu_des_ecb;
                ifxdeu_des_alg.cra_u.cipher.cia_cbc = ifx_deu_des_cbc;
                ifxdeu_des_alg.cra_u.cipher.cia_cfb = ifx_deu_des_cfb;
                ifxdeu_des_alg.cra_u.cipher.cia_ofb = ifx_deu_des_ofb;
        }
#endif

        ret = crypto_register_alg(&ifxdeu_des_alg);
        if (ret < 0)
                goto des_err;

        ret = crypto_register_alg(&ifxdeu_ecb_des_alg);
        if (ret < 0)
                goto ecb_des_err;

        ret = crypto_register_alg(&ifxdeu_cbc_des_alg);
        if (ret < 0)
                goto cbc_des_err;

        ret = crypto_register_alg(&ifxdeu_des3_ede_alg);
        if (ret < 0)
                goto des3_ede_err;

        ret = crypto_register_alg(&ifxdeu_ecb_des3_ede_alg);
        if (ret < 0)
                goto ecb_des3_ede_err;

        ret = crypto_register_alg(&ifxdeu_cbc_des3_ede_alg);
        if (ret < 0)
                goto cbc_des3_ede_err;

        des_chip_init();
        CRTCL_SECT_INIT;



         printk (KERN_NOTICE "IFX DEU DES initialized%s%s.\n", disable_multiblock ? "" : " (multiblock)", disable_deudma ? "" : " (DMA)");
        return ret;

des_err:
        crypto_unregister_alg(&ifxdeu_des_alg);
        printk(KERN_ERR "IFX des initialization failed!\n");
        return ret;
ecb_des_err:
        crypto_unregister_alg(&ifxdeu_ecb_des_alg);
        printk (KERN_ERR "IFX ecb_des initialization failed!\n");
        return ret;
cbc_des_err:
        crypto_unregister_alg(&ifxdeu_cbc_des_alg);
        printk (KERN_ERR "IFX cbc_des initialization failed!\n");
        return ret;
des3_ede_err:
        crypto_unregister_alg(&ifxdeu_des3_ede_alg);
        printk(KERN_ERR "IFX des3_ede initialization failed!\n");
        return ret;
ecb_des3_ede_err:
        crypto_unregister_alg(&ifxdeu_ecb_des3_ede_alg);
        printk (KERN_ERR "IFX ecb_des3_ede initialization failed!\n");
        return ret;
cbc_des3_ede_err:
        crypto_unregister_alg(&ifxdeu_cbc_des3_ede_alg);
        printk (KERN_ERR "IFX cbc_des3_ede initialization failed!\n");
        return ret;

}

/*! \fn void __exit ifxdeu_fini_des (void)
 *  \ingroup IFX_DES_FUNCTIONS
 *  \brief unregister des driver    
*/                                 
void __exit ifxdeu_fini_des (void)
{
        crypto_unregister_alg (&ifxdeu_des_alg);
        crypto_unregister_alg (&ifxdeu_ecb_des_alg);
        crypto_unregister_alg (&ifxdeu_cbc_des_alg);
        crypto_unregister_alg (&ifxdeu_des3_ede_alg);
        crypto_unregister_alg (&ifxdeu_ecb_des3_ede_alg);
        crypto_unregister_alg (&ifxdeu_cbc_des3_ede_alg);

}