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1 office 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  
67 static 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
74 extern 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  
80 struct md5_ctx {
81 int started;
82 u32 hash[MD5_HASH_WORDS];
83 u32 block[MD5_BLOCK_WORDS];
84 u64 byte_count;
85 };
86  
87 extern 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 */
94 static 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 */
107 static 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 */
147 static 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 */
158 static 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 */
180 static 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 */
217 static 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 */
263 static 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_priority = 300,
273 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
274 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
275 .cra_module = THIS_MODULE,
276 }
277 };
278  
279 /*! \fn int ifxdeu_init_md5 (void)
280 * \ingroup IFX_MD5_FUNCTIONS
281 * \brief initialize md5 driver
282 */
283 int ifxdeu_init_md5 (void)
284 {
285 int ret = -ENOSYS;
286  
287  
288 if ((ret = crypto_register_shash(&ifxdeu_md5_alg)))
289 goto md5_err;
290  
291 CRTCL_SECT_INIT;
292  
293 printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
294 return ret;
295  
296 md5_err:
297 printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
298 return ret;
299 }
300  
301 /*! \fn void ifxdeu_fini_md5 (void)
302 * \ingroup IFX_MD5_FUNCTIONS
303 * \brief unregister md5 driver
304 */
305  
306 void ifxdeu_fini_md5 (void)
307 {
308 crypto_unregister_shash(&ifxdeu_md5_alg);
309  
310 }
311