Root/package/platform/lantiq/ltq-deu/src/ifxmips_sha1_hmac.c

1/******************************************************************************
2**
3** FILE NAME : ifxmips_sha1_hmac.c
4** PROJECT : IFX UEIP
5** MODULES : DEU Module for UEIP
6** DATE : September 8, 2009
7** AUTHOR : Mohammad Firdaus
8** DESCRIPTION : Data Encryption Unit Driver
9** COPYRIGHT : Copyright (c) 2009
10** Infineon Technologies AG
11** Am Campeon 1-12, 85579 Neubiberg, Germany
12**
13** This program is free software; you can redistribute it and/or modify
14** it under the terms of the GNU General Public License as published by
15** the Free Software Foundation; either version 2 of the License, or
16** (at your option) any later version.
17**
18** HISTORY
19** $Date $Author $Comment
20** 08,Sept 2009 Mohammad Firdaus Initial UEIP release
21** 21,March 2011 Mohammad Firdaus Changes for Kernel 2.6.32 and IPSec integration
22*******************************************************************************/
23/*!
24  \defgroup IFX_DEU IFX_DEU_DRIVERS
25  \ingroup API
26  \brief ifx deu driver module
27*/
28
29/*!
30  \file ifxmips_sha1_hmac.c
31  \ingroup IFX_DEU
32  \brief SHA1-HMAC deu driver file
33*/
34
35/*!
36  \defgroup IFX_SHA1_HMAC_FUNCTIONS IFX_SHA1_HMAC_FUNCTIONS
37  \ingroup IFX_DEU
38  \brief ifx sha1 hmac functions
39*/
40
41
42/* Project header */
43#include <linux/init.h>
44#include <linux/module.h>
45#include <linux/mm.h>
46#include <linux/crypto.h>
47#include <linux/cryptohash.h>
48#include <crypto/internal/hash.h>
49#include <linux/types.h>
50#include <asm/scatterlist.h>
51#include <asm/byteorder.h>
52#include <linux/delay.h>
53
54#if defined(CONFIG_AR9)
55#include "ifxmips_deu_ar9.h"
56#elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
57#include "ifxmips_deu_vr9.h"
58#else
59#error "Plaform Unknwon!"
60#endif
61
62#define SHA1_DIGEST_SIZE 20
63#define SHA1_HMAC_BLOCK_SIZE 64
64#define SHA1_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround
65#define HASH_START IFX_HASH_CON
66
67#define SHA1_HMAC_MAX_KEYLEN 64
68
69static spinlock_t lock;
70#define CRTCL_SECT_INIT spin_lock_init(&lock)
71#define CRTCL_SECT_START spin_lock_irqsave(&lock, flag)
72#define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag)
73
74#ifdef CRYPTO_DEBUG
75extern char debug_level;
76#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
77#else
78#define DPRINTF(level, format, args...)
79#endif
80
81struct sha1_hmac_ctx {
82    int keylen;
83
84    u8 buffer[SHA1_HMAC_BLOCK_SIZE];
85    u8 key[SHA1_HMAC_MAX_KEYLEN];
86    u32 state[5];
87    u32 dbn;
88    u64 count;
89
90};
91
92static u32 temp[SHA1_HMAC_DBN_TEMP_SIZE];
93
94extern int disable_deudma;
95
96/*! \fn static void sha1_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
97 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
98 * \brief save input block to context
99 * \param tfm linux crypto algo transform
100 * \param in 64-byte block of input
101*/
102static int sha1_hmac_transform(struct shash_desc *desc, u32 const *in)
103{
104    struct sha1_hmac_ctx *sctx = crypto_shash_ctx(desc->tfm);
105
106    memcpy(&temp[sctx->dbn<<4], in, 64); //dbn workaround
107    sctx->dbn += 1;
108    
109    if ( (sctx->dbn<<4) > SHA1_HMAC_DBN_TEMP_SIZE )
110    {
111        printk("SHA1_HMAC_DBN_TEMP_SIZE exceeded\n");
112    }
113   
114    return 0;
115}
116
117/*! \fn int sha1_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
118 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
119 * \brief sets sha1 hmac key
120 * \param tfm linux crypto algo transform
121 * \param key input key
122 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
123*/
124static int sha1_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
125{
126    struct sha1_hmac_ctx *sctx = crypto_shash_ctx(tfm);
127    volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
128    
129    if (keylen > SHA1_HMAC_MAX_KEYLEN) {
130    printk("Key length exceeds maximum key length\n");
131    return -EINVAL;
132    }
133
134    //printk("Setting keys of len: %d\n", keylen);
135     
136    hashs->KIDX |= 0x80000000; //reset keys back to 0
137    memcpy(&sctx->key, key, keylen);
138    sctx->keylen = keylen;
139
140    return 0;
141         
142}
143
144
145/*! \fn int sha1_hmac_setkey_hw(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
146 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
147 * \brief sets sha1 hmac key into hw registers
148 * \param tfm linux crypto algo transform
149 * \param key input key
150 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
151*/
152static int sha1_hmac_setkey_hw(const u8 *key, unsigned int keylen)
153{
154    volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
155    int i, j;
156    unsigned long flag;
157    u32 *in_key = (u32 *)key;
158
159    j = 0;
160
161    CRTCL_SECT_START;
162    for (i = 0; i < keylen; i+=4)
163    {
164         hash->KIDX = j;
165         asm("sync");
166         hash->KEY = *((u32 *) in_key + j);
167         j++;
168    }
169
170    CRTCL_SECT_END;
171    return 0;
172}
173
174/*! \fn void sha1_hmac_init(struct crypto_tfm *tfm)
175 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
176 * \brief initialize sha1 hmac context
177 * \param tfm linux crypto algo transform
178*/
179static int sha1_hmac_init(struct shash_desc *desc)
180{
181    struct sha1_hmac_ctx *sctx = crypto_shash_ctx(desc->tfm);
182
183    //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
184    sctx->dbn = 0; //dbn workaround
185    sha1_hmac_setkey_hw(sctx->key, sctx->keylen);
186
187    return 0;
188}
189
190/*! \fn static void sha1_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
191 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
192 * \brief on-the-fly sha1 hmac computation
193 * \param tfm linux crypto algo transform
194 * \param data input data
195 * \param len size of input data
196*/
197static int sha1_hmac_update(struct shash_desc *desc, const u8 *data,
198            unsigned int len)
199{
200    struct sha1_hmac_ctx *sctx = crypto_shash_ctx(desc->tfm);
201    unsigned int i, j;
202
203    j = (sctx->count >> 3) & 0x3f;
204    sctx->count += len << 3;
205   // printk("sctx->count = %d\n", sctx->count);
206
207    if ((j + len) > 63) {
208        memcpy (&sctx->buffer[j], data, (i = 64 - j));
209        sha1_hmac_transform (desc, (const u32 *)sctx->buffer);
210        for (; i + 63 < len; i += 64) {
211            sha1_hmac_transform (desc, (const u32 *)&data[i]);
212        }
213
214        j = 0;
215    }
216    else
217        i = 0;
218
219    memcpy (&sctx->buffer[j], &data[i], len - i);
220    return 0;
221}
222
223/*! \fn static void sha1_hmac_final(struct crypto_tfm *tfm, u8 *out)
224 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
225 * \brief ompute final sha1 hmac value
226 * \param tfm linux crypto algo transform
227 * \param out final sha1 hmac output value
228*/
229static int sha1_hmac_final(struct shash_desc *desc, u8 *out)
230{
231    //struct sha1_hmac_ctx *sctx = shash_desc_ctx(desc);
232    struct sha1_hmac_ctx *sctx = crypto_shash_ctx(desc->tfm);
233    u32 index, padlen;
234    u64 t;
235    u8 bits[8] = { 0, };
236    static const u8 padding[64] = { 0x80, };
237    volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
238    unsigned long flag;
239    int i = 0;
240    int dbn;
241    u32 *in = &temp[0];
242        
243    t = sctx->count + 512; // need to add 512 bit of the IPAD operation
244    bits[7] = 0xff & t;
245    t >>= 8;
246    bits[6] = 0xff & t;
247    t >>= 8;
248    bits[5] = 0xff & t;
249    t >>= 8;
250    bits[4] = 0xff & t;
251    t >>= 8;
252    bits[3] = 0xff & t;
253    t >>= 8;
254    bits[2] = 0xff & t;
255    t >>= 8;
256    bits[1] = 0xff & t;
257    t >>= 8;
258    bits[0] = 0xff & t;
259
260    /* Pad out to 56 mod 64 */
261    index = (sctx->count >> 3) & 0x3f;
262    padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
263    sha1_hmac_update (desc, padding, padlen);
264
265    /* Append length */
266    sha1_hmac_update (desc, bits, sizeof bits);
267
268    CRTCL_SECT_START;
269    
270    hashs->DBN = sctx->dbn;
271    
272    //for vr9 change, ENDI = 1
273    *IFX_HASH_CON = HASH_CON_VALUE;
274
275    //wait for processing
276    while (hashs->controlr.BSY) {
277        // this will not take long
278    }
279
280    for (dbn = 0; dbn < sctx->dbn; dbn++)
281    {
282    for (i = 0; i < 16; i++) {
283        hashs->MR = in[i];
284    };
285
286    hashs->controlr.GO = 1;
287    asm("sync");
288
289    //wait for processing
290    while (hashs->controlr.BSY) {
291            // this will not take long
292    }
293    
294    in += 16;
295}
296
297
298#if 1
299    //wait for digest ready
300    while (! hashs->controlr.DGRY) {
301        // this will not take long
302    }
303#endif
304
305    *((u32 *) out + 0) = hashs->D1R;
306    *((u32 *) out + 1) = hashs->D2R;
307    *((u32 *) out + 2) = hashs->D3R;
308    *((u32 *) out + 3) = hashs->D4R;
309    *((u32 *) out + 4) = hashs->D5R;
310
311    memset(&sctx->buffer[0], 0, SHA1_HMAC_BLOCK_SIZE);
312    sctx->count = 0;
313 
314    //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
315    CRTCL_SECT_END;
316
317
318    return 0;
319
320}
321
322/*
323 * \brief SHA1-HMAC function mappings
324*/
325static struct shash_alg ifxdeu_sha1_hmac_alg = {
326        .digestsize = SHA1_DIGEST_SIZE,
327        .init = sha1_hmac_init,
328        .update = sha1_hmac_update,
329        .final = sha1_hmac_final,
330        .setkey = sha1_hmac_setkey,
331        .descsize = sizeof(struct sha1_hmac_ctx),
332        .base = {
333                .cra_name = "hmac(sha1)",
334                .cra_driver_name= "ifxdeu-sha1_hmac",
335        .cra_ctxsize = sizeof(struct sha1_hmac_ctx),
336                .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
337                .cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
338                .cra_module = THIS_MODULE,
339        }
340
341};
342
343
344/*! \fn int __init ifxdeu_init_sha1_hmac (void)
345 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
346 * \brief initialize sha1 hmac driver
347*/
348int __init ifxdeu_init_sha1_hmac (void)
349{
350    int ret = -ENOSYS;
351
352
353
354    if ((ret = crypto_register_shash(&ifxdeu_sha1_hmac_alg)))
355        goto sha1_err;
356
357    CRTCL_SECT_INIT;
358
359    printk (KERN_NOTICE "IFX DEU SHA1_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
360    return ret;
361
362sha1_err:
363    printk(KERN_ERR "IFX DEU SHA1_HMAC initialization failed!\n");
364    return ret;
365}
366
367/*! \fn void __exit ifxdeu_fini_sha1_hmac (void)
368 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
369 * \brief unregister sha1 hmac driver
370*/
371void __exit ifxdeu_fini_sha1_hmac (void)
372{
373
374    crypto_unregister_shash(&ifxdeu_sha1_hmac_alg);
375
376
377}
378
379

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