Root/package/platform/lantiq/ltq-deu/src/ifxmips_md5_hmac.c

1/******************************************************************************
2**
3** FILE NAME : ifxmips_md5_hmac.c
4** PROJECT : IFX UEIP
5** MODULES : DEU Module for UEIP
6**
7** DATE : September 8, 2009
8** AUTHOR : Mohammad Firdaus
9** DESCRIPTION : Data Encryption Unit Driver
10** COPYRIGHT : Copyright (c) 2009
11** Infineon Technologies AG
12** Am Campeon 1-12, 85579 Neubiberg, Germany
13**
14** This program is free software; you can redistribute it and/or modify
15** it under the terms of the GNU General Public License as published by
16** the Free Software Foundation; either version 2 of the License, or
17** (at your option) any later version.
18**
19** HISTORY
20** $Date $Author $Comment
21** 08,Sept 2009 Mohammad Firdaus Initial UEIP release
22** 21,March 2011 Mohammad Firdaus Changes for Kernel 2.6.32 and IPSec integration
23*******************************************************************************/
24/*!
25  \defgroup IFX_DEU IFX_DEU_DRIVERS
26  \ingroup API
27  \brief ifx deu driver module
28*/
29
30/*!
31  \file ifxmips_md5_hmac.c
32  \ingroup IFX_DEU
33  \brief MD5-HMAC encryption deu driver file
34*/
35
36/*!
37 \defgroup IFX_MD5_HMAC_FUNCTIONS IFX_MD5_HMAC_FUNCTIONS
38 \ingroup IFX_DEU
39 \brief ifx md5-hmac driver functions
40*/
41
42/* Project Header files */
43#include <linux/init.h>
44#include <linux/module.h>
45#include <linux/string.h>
46#include <linux/crypto.h>
47#include <linux/types.h>
48#include <crypto/internal/hash.h>
49#include <asm/byteorder.h>
50
51#if defined(CONFIG_AR9)
52#include "ifxmips_deu_ar9.h"
53#elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
54#include "ifxmips_deu_vr9.h"
55#else
56#error "Plaform Unknwon!"
57#endif
58
59#define MD5_DIGEST_SIZE 16
60#define MD5_HMAC_BLOCK_SIZE 64
61#define MD5_BLOCK_WORDS 16
62#define MD5_HASH_WORDS 4
63#define MD5_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround
64#define HASH_START IFX_HASH_CON
65
66static spinlock_t lock;
67#define CRTCL_SECT_INIT spin_lock_init(&lock)
68#define CRTCL_SECT_START spin_lock_irqsave(&lock, flag)
69#define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag)
70
71//#define CRYPTO_DEBUG
72#ifdef CRYPTO_DEBUG
73extern char debug_level;
74#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
75#else
76#define DPRINTF(level, format, args...)
77#endif
78
79#define MAX_HASH_KEYLEN 64
80
81struct md5_hmac_ctx {
82    u8 key[MAX_HASH_KEYLEN];
83    u32 hash[MD5_HASH_WORDS];
84    u32 block[MD5_BLOCK_WORDS];
85    u64 byte_count;
86    u32 dbn;
87    unsigned int keylen;
88};
89
90static u32 temp[MD5_HMAC_DBN_TEMP_SIZE];
91
92extern int disable_deudma;
93
94/*! \fn static u32 endian_swap(u32 input)
95 * \ingroup IFX_MD5_HMAC_FUNCTIONS
96 * \brief perform dword level endian swap
97 * \param input value of dword that requires to be swapped
98*/
99static u32 endian_swap(u32 input)
100{
101    u8 *ptr = (u8 *)&input;
102    
103    return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
104}
105
106/*! \fn static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
107 * \ingroup IFX_MD5_HMAC_FUNCTIONS
108 * \brief save input block to context
109 * \param tfm linux crypto algo transform
110 * \param in 64-byte block of input
111*/
112static void md5_hmac_transform(struct shash_desc *desc, u32 const *in)
113{
114    struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
115
116    memcpy(&temp[mctx->dbn<<4], in, 64); //dbn workaround
117    mctx->dbn += 1;
118    
119    if ( (mctx->dbn<<4) > MD5_HMAC_DBN_TEMP_SIZE )
120    {
121        printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n");
122    }
123
124}
125
126/*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
127 * \ingroup IFX_MD5_HMAC_FUNCTIONS
128 * \brief sets md5 hmac key
129 * \param tfm linux crypto algo transform
130 * \param key input key
131 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
132*/
133static int md5_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
134{
135    struct md5_hmac_ctx *mctx = crypto_shash_ctx(tfm);
136    volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
137    //printk("copying keys to context with length %d\n", keylen);
138
139    if (keylen > MAX_HASH_KEYLEN) {
140    printk("Key length more than what DEU hash can handle\n");
141    return -EINVAL;
142    }
143 
144
145    hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0'
146    memcpy(&mctx->key, key, keylen);
147    mctx->keylen = keylen;
148
149    return 0;
150
151}
152
153
154/*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
155 * \ingroup IFX_MD5_HMAC_FUNCTIONS
156 * \brief sets md5 hmac key into the hardware registers
157 * \param key input key
158 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
159*/
160                               
161static int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
162{
163    volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
164    unsigned long flag;
165    int i, j;
166    u32 *in_key = (u32 *)key;
167
168    //printk("\nsetkey keylen: %d\n key: ", keylen);
169    
170    CRTCL_SECT_START;
171    j = 0;
172    for (i = 0; i < keylen; i+=4)
173    {
174         hash->KIDX = j;
175         asm("sync");
176         hash->KEY = *((u32 *) in_key + j);
177         asm("sync");
178         j++;
179    }
180    CRTCL_SECT_END;
181
182    return 0;
183}
184
185/*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
186 * \ingroup IFX_MD5_HMAC_FUNCTIONS
187 * \brief initialize md5 hmac context
188 * \param tfm linux crypto algo transform
189*/
190static int md5_hmac_init(struct shash_desc *desc)
191{
192
193    struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
194    
195
196    mctx->dbn = 0; //dbn workaround
197    md5_hmac_setkey_hw(mctx->key, mctx->keylen);
198
199    return 0;
200}
201EXPORT_SYMBOL(md5_hmac_init);
202    
203/*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
204 * \ingroup IFX_MD5_HMAC_FUNCTIONS
205 * \brief on-the-fly md5 hmac computation
206 * \param tfm linux crypto algo transform
207 * \param data input data
208 * \param len size of input data
209*/
210static int md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len)
211{
212    struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
213    const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
214
215    mctx->byte_count += len;
216    
217    if (avail > len) {
218        memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
219               data, len);
220        return 0;
221    }
222
223    memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
224           data, avail);
225
226    md5_hmac_transform(desc, mctx->block);
227    data += avail;
228    len -= avail;
229
230    while (len >= sizeof(mctx->block)) {
231        memcpy(mctx->block, data, sizeof(mctx->block));
232        md5_hmac_transform(desc, mctx->block);
233        data += sizeof(mctx->block);
234        len -= sizeof(mctx->block);
235    }
236
237    memcpy(mctx->block, data, len);
238    return 0;
239}
240EXPORT_SYMBOL(md5_hmac_update);
241
242/*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
243 * \ingroup IFX_MD5_HMAC_FUNCTIONS
244 * \brief compute final md5 hmac value
245 * \param tfm linux crypto algo transform
246 * \param out final md5 hmac output value
247*/
248static int md5_hmac_final(struct shash_desc *desc, u8 *out)
249{
250    struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
251    const unsigned int offset = mctx->byte_count & 0x3f;
252    char *p = (char *)mctx->block + offset;
253    int padding = 56 - (offset + 1);
254    volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
255    unsigned long flag;
256    int i = 0;
257    int dbn;
258    u32 *in = &temp[0];
259
260
261    *p++ = 0x80;
262    if (padding < 0) {
263        memset(p, 0x00, padding + sizeof (u64));
264        md5_hmac_transform(desc, mctx->block);
265        p = (char *)mctx->block;
266        padding = 56;
267    }
268
269    memset(p, 0, padding);
270    mctx->block[14] = endian_swap((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
271    mctx->block[15] = 0x00000000;
272
273    md5_hmac_transform(desc, mctx->block);
274
275    CRTCL_SECT_START;
276
277    //printk("\ndbn = %d\n", mctx->dbn);
278    hashs->DBN = mctx->dbn;
279    asm("sync");
280    
281    *IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
282
283    //wait for processing
284    while (hashs->controlr.BSY) {
285        // this will not take long
286    }
287
288    for (dbn = 0; dbn < mctx->dbn; dbn++)
289    {
290        for (i = 0; i < 16; i++) {
291            hashs->MR = in[i];
292        };
293
294        hashs->controlr.GO = 1;
295        asm("sync");
296
297        //wait for processing
298        while (hashs->controlr.BSY) {
299           // this will not take long
300        }
301    
302        in += 16;
303}
304
305
306#if 1
307    //wait for digest ready
308    while (! hashs->controlr.DGRY) {
309        // this will not take long
310    }
311#endif
312
313    *((u32 *) out + 0) = hashs->D1R;
314    *((u32 *) out + 1) = hashs->D2R;
315    *((u32 *) out + 2) = hashs->D3R;
316    *((u32 *) out + 3) = hashs->D4R;
317    *((u32 *) out + 4) = hashs->D5R;
318
319    /* reset the context after we finish with the hash */
320    mctx->byte_count = 0;
321    memset(&mctx->hash[0], 0, sizeof(MD5_HASH_WORDS));
322    memset(&mctx->block[0], 0, sizeof(MD5_BLOCK_WORDS));
323    memset(&temp[0], 0, MD5_HMAC_DBN_TEMP_SIZE);
324
325    CRTCL_SECT_END;
326
327
328   return 0;
329}
330
331EXPORT_SYMBOL(md5_hmac_final);
332
333/*
334 * \brief MD5_HMAC function mappings
335*/
336
337static struct shash_alg ifxdeu_md5_hmac_alg = {
338    .digestsize = MD5_DIGEST_SIZE,
339    .init = md5_hmac_init,
340    .update = md5_hmac_update,
341    .final = md5_hmac_final,
342    .setkey = md5_hmac_setkey,
343    .descsize = sizeof(struct md5_hmac_ctx),
344    .base = {
345        .cra_name = "hmac(md5)",
346        .cra_driver_name= "ifxdeu-md5_hmac",
347        .cra_ctxsize = sizeof(struct md5_hmac_ctx),
348        .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
349        .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
350        .cra_module = THIS_MODULE,
351        }
352};
353
354/*! \fn int __init ifxdeu_init_md5_hmac (void)
355 * \ingroup IFX_MD5_HMAC_FUNCTIONS
356 * \brief initialize md5 hmac driver
357*/
358int __init ifxdeu_init_md5_hmac (void)
359{
360
361    int ret = -ENOSYS;
362
363
364    if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg)))
365        goto md5_hmac_err;
366
367    CRTCL_SECT_INIT;
368
369    printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
370    return ret;
371
372md5_hmac_err:
373    printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
374    return ret;
375}
376
377/** \fn void __exit ifxdeu_fini_md5_hmac (void)
378 * \ingroup IFX_MD5_HMAC_FUNCTIONS
379 * \brief unregister md5 hmac driver
380*/
381void __exit ifxdeu_fini_md5_hmac (void)
382{
383    crypto_unregister_shash(&ifxdeu_md5_hmac_alg);
384}
385
386
387

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