1/******************************************************************************
2**
3** FILE NAME    : ifxmips_md5.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*******************************************************************************/
23/*!
24  \defgroup    IFX_DEU IFX_DEU_DRIVERS
25  \ingroup API
26  \brief ifx deu driver module
27*/
28
29/*!
30  \file		ifxmips_md5.c
31  \ingroup 	IFX_DEU
32  \brief 	MD5 encryption deu driver file
33*/
34
35/*!
36  \defgroup IFX_MD5_FUNCTIONS IFX_MD5_FUNCTIONS
37  \ingroup IFX_DEU
38  \brief ifx deu MD5 functions
39*/
40
41/*Project header files */
42#include <linux/init.h>
43#include <linux/module.h>
44#include <linux/string.h>
45#include <linux/crypto.h>
46#include <linux/types.h>
47#include <crypto/internal/hash.h>
48#include <asm/byteorder.h>
49
50/* Project header */
51#if defined(CONFIG_DANUBE)
52#include "ifxmips_deu_danube.h"
53#elif defined(CONFIG_AR9)
54#include "ifxmips_deu_ar9.h"
55#elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
56#include "ifxmips_deu_vr9.h"
57#else
58#error "Plaform Unknwon!"
59#endif
60
61#define MD5_DIGEST_SIZE     16
62#define MD5_HMAC_BLOCK_SIZE 64
63#define MD5_BLOCK_WORDS     16
64#define MD5_HASH_WORDS      4
65#define HASH_START   IFX_HASH_CON
66
67static spinlock_t lock;
68#define CRTCL_SECT_INIT        spin_lock_init(&lock)
69#define CRTCL_SECT_START       spin_lock_irqsave(&lock, flag)
70#define CRTCL_SECT_END         spin_unlock_irqrestore(&lock, flag)
71
72//#define CRYPTO_DEBUG
73#ifdef CRYPTO_DEBUG
74extern char debug_level;
75#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
76#else
77#define DPRINTF(level, format, args...)
78#endif
79
80struct md5_ctx {
81    int started;
82    u32 hash[MD5_HASH_WORDS];
83    u32 block[MD5_BLOCK_WORDS];
84    u64 byte_count;
85};
86
87extern int disable_deudma;
88
89/*! \fn static u32 endian_swap(u32 input)
90 *  \ingroup IFX_MD5_FUNCTIONS
91 *  \brief perform dword level endian swap
92 *  \param input value of dword that requires to be swapped
93*/
94static u32 endian_swap(u32 input)
95{
96    u8 *ptr = (u8 *)&input;
97
98    return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
99}
100
101/*! \fn static void md5_transform(u32 *hash, u32 const *in)
102 *  \ingroup IFX_MD5_FUNCTIONS
103 *  \brief main interface to md5 hardware
104 *  \param hash current hash value
105 *  \param in 64-byte block of input
106*/
107static void md5_transform(struct md5_ctx *mctx, u32 *hash, u32 const *in)
108{
109    int i;
110    volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
111    unsigned long flag;
112
113    CRTCL_SECT_START;
114
115    if (mctx->started) {
116        hashs->D1R = endian_swap(*((u32 *) hash + 0));
117    	hashs->D2R = endian_swap(*((u32 *) hash + 1));
118        hashs->D3R = endian_swap(*((u32 *) hash + 2));
119        hashs->D4R = endian_swap(*((u32 *) hash + 3));
120    }
121
122    for (i = 0; i < 16; i++) {
123        hashs->MR = endian_swap(in[i]);
124//	printk("in[%d]: %08x\n", i, endian_swap(in[i]));
125    };
126
127    //wait for processing
128    while (hashs->controlr.BSY) {
129        // this will not take long
130    }
131
132    *((u32 *) hash + 0) = endian_swap (hashs->D1R);
133    *((u32 *) hash + 1) = endian_swap (hashs->D2R);
134    *((u32 *) hash + 2) = endian_swap (hashs->D3R);
135    *((u32 *) hash + 3) = endian_swap (hashs->D4R);
136
137    mctx->started = 1;
138
139    CRTCL_SECT_END;
140}
141
142/*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx)
143 *  \ingroup IFX_MD5_FUNCTIONS
144 *  \brief interfacing function for md5_transform()
145 *  \param ctx crypto context
146*/
147static inline void md5_transform_helper(struct md5_ctx *ctx)
148{
149    //le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
150    md5_transform(ctx, ctx->hash, ctx->block);
151}
152
153/*! \fn static void md5_init(struct crypto_tfm *tfm)
154 *  \ingroup IFX_MD5_FUNCTIONS
155 *  \brief initialize md5 hardware
156 *  \param tfm linux crypto algo transform
157*/
158static int md5_init(struct shash_desc *desc)
159{
160    struct md5_ctx *mctx = shash_desc_ctx(desc);
161    volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
162
163    hash->controlr.ENDI = 0;
164    hash->controlr.SM = 1;
165    hash->controlr.ALGO = 1;    // 1 = md5  0 = sha1
166    hash->controlr.INIT = 1;    // Initialize the hash operation by writing a '1' to the INIT bit.
167
168    mctx->byte_count = 0;
169    mctx->started = 0;
170    return 0;
171}
172
173/*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
174 *  \ingroup IFX_MD5_FUNCTIONS
175 *  \brief on-the-fly md5 computation
176 *  \param tfm linux crypto algo transform
177 *  \param data input data
178 *  \param len size of input data
179*/
180static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
181{
182    struct md5_ctx *mctx = shash_desc_ctx(desc);
183    const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
184
185    mctx->byte_count += len;
186
187    if (avail > len) {
188        memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
189               data, len);
190        return 0;
191    }
192
193    memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
194           data, avail);
195
196    md5_transform_helper(mctx);
197    data += avail;
198    len -= avail;
199
200    while (len >= sizeof(mctx->block)) {
201        memcpy(mctx->block, data, sizeof(mctx->block));
202        md5_transform_helper(mctx);
203        data += sizeof(mctx->block);
204        len -= sizeof(mctx->block);
205    }
206
207    memcpy(mctx->block, data, len);
208    return 0;
209}
210
211/*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out)
212 *  \ingroup IFX_MD5_FUNCTIONS
213 *  \brief compute final md5 value
214 *  \param tfm linux crypto algo transform
215 *  \param out final md5 output value
216*/
217static int md5_final(struct shash_desc *desc, u8 *out)
218{
219    struct md5_ctx *mctx = shash_desc_ctx(desc);
220    const unsigned int offset = mctx->byte_count & 0x3f;
221    char *p = (char *)mctx->block + offset;
222    int padding = 56 - (offset + 1);
223    volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
224    unsigned long flag;
225
226    *p++ = 0x80;
227    if (padding < 0) {
228        memset(p, 0x00, padding + sizeof (u64));
229        md5_transform_helper(mctx);
230        p = (char *)mctx->block;
231        padding = 56;
232    }
233
234    memset(p, 0, padding);
235    mctx->block[14] = endian_swap(mctx->byte_count << 3);
236    mctx->block[15] = endian_swap(mctx->byte_count >> 29);
237
238#if 0
239    le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
240                      sizeof(u64)) / sizeof(u32));
241#endif
242
243    md5_transform(mctx, mctx->hash, mctx->block);
244
245    CRTCL_SECT_START;
246
247    *((u32 *) out + 0) = endian_swap (hashs->D1R);
248    *((u32 *) out + 1) = endian_swap (hashs->D2R);
249    *((u32 *) out + 2) = endian_swap (hashs->D3R);
250    *((u32 *) out + 3) = endian_swap (hashs->D4R);
251
252    CRTCL_SECT_END;
253
254    // Wipe context
255    memset(mctx, 0, sizeof(*mctx));
256
257    return 0;
258}
259
260/*
261 * \brief MD5 function mappings
262*/
263static struct shash_alg ifxdeu_md5_alg = {
264    .digestsize         =       MD5_DIGEST_SIZE,
265    .init               =       md5_init,
266    .update             =       md5_update,
267    .final              =       md5_final,
268    .descsize           =       sizeof(struct md5_ctx),
269    .base               =       {
270                .cra_name       =       "md5",
271                .cra_driver_name=       "ifxdeu-md5",
272                .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
273                .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
274                .cra_module     =       THIS_MODULE,
275    }
276};
277
278/*! \fn int __init ifxdeu_init_md5 (void)
279 *  \ingroup IFX_MD5_FUNCTIONS
280 *  \brief initialize md5 driver
281*/
282int __init ifxdeu_init_md5 (void)
283{
284    int ret = -ENOSYS;
285
286
287    if ((ret = crypto_register_shash(&ifxdeu_md5_alg)))
288        goto md5_err;
289
290    CRTCL_SECT_INIT;
291
292    printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
293    return ret;
294
295md5_err:
296    printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
297    return ret;
298}
299
300/*! \fn void __exit ifxdeu_fini_md5 (void)
301  * \ingroup IFX_MD5_FUNCTIONS
302  * \brief unregister md5 driver
303*/
304
305void __exit ifxdeu_fini_md5 (void)
306{
307    crypto_unregister_shash(&ifxdeu_md5_alg);
308
309}
310
311