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[openwrt/openwrt.git] / package / kernel / 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
66 //#define CRYPTO_DEBUG
67 #ifdef CRYPTO_DEBUG
68 extern char debug_level;
69 #define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
70 #else
71 #define DPRINTF(level, format, args...)
72 #endif
73
74 #define MAX_HASH_KEYLEN 64
75
76 struct md5_hmac_ctx {
77 u8 key[MAX_HASH_KEYLEN];
78 u32 hash[MD5_HASH_WORDS];
79 u32 block[MD5_BLOCK_WORDS];
80 u64 byte_count;
81 u32 dbn;
82 unsigned int keylen;
83 struct shash_desc *desc;
84 u32 (*temp)[MD5_BLOCK_WORDS];
85 };
86
87 extern int disable_deudma;
88
89 /*! \fn static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
90 * \ingroup IFX_MD5_HMAC_FUNCTIONS
91 * \brief save input block to context
92 * \param tfm linux crypto algo transform
93 * \param in 64-byte block of input
94 */
95 static void md5_hmac_transform(struct shash_desc *desc, u32 const *in)
96 {
97 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
98
99 memcpy(&mctx->temp[mctx->dbn], in, 64); //dbn workaround
100 mctx->dbn += 1;
101
102 if ( (mctx->dbn<<4) > MD5_HMAC_DBN_TEMP_SIZE )
103 {
104 printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n");
105 }
106
107 }
108
109 /*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
110 * \ingroup IFX_MD5_HMAC_FUNCTIONS
111 * \brief sets md5 hmac key
112 * \param tfm linux crypto algo transform
113 * \param key input key
114 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
115 */
116 static int md5_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
117 {
118 struct md5_hmac_ctx *mctx = crypto_shash_ctx(tfm);
119 volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
120 int err;
121 //printk("copying keys to context with length %d\n", keylen);
122
123 if (keylen > MAX_HASH_KEYLEN) {
124 char *hash_alg_name = "md5";
125
126 mctx->desc->tfm = crypto_alloc_shash(hash_alg_name, 0, 0);
127 if (IS_ERR(mctx->desc->tfm)) return PTR_ERR(mctx->desc->tfm);
128
129 memset(mctx->key, 0, MAX_HASH_KEYLEN);
130 err = crypto_shash_digest(mctx->desc, key, keylen, mctx->key);
131 if (err) return err;
132
133 mctx->keylen = MD5_DIGEST_SIZE;
134
135 crypto_free_shash(mctx->desc->tfm);
136 } else {
137 memcpy(mctx->key, key, keylen);
138 mctx->keylen = keylen;
139 }
140 memset(mctx->key + mctx->keylen, 0, MAX_HASH_KEYLEN - mctx->keylen);
141
142 return 0;
143 }
144
145
146 /*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
147 * \ingroup IFX_MD5_HMAC_FUNCTIONS
148 * \brief sets md5 hmac key into the hardware registers
149 * \param key input key
150 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
151 */
152
153 static int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
154 {
155 volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
156 int i, j;
157 u32 *in_key = (u32 *)key;
158
159 //printk("\nsetkey keylen: %d\n key: ", keylen);
160
161 hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0'
162 j = 0;
163 for (i = 0; i < keylen; i+=4)
164 {
165 hash->KIDX = j;
166 asm("sync");
167 hash->KEY = *((u32 *) in_key + j);
168 asm("sync");
169 j++;
170 }
171
172 return 0;
173 }
174
175 /*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
176 * \ingroup IFX_MD5_HMAC_FUNCTIONS
177 * \brief initialize md5 hmac context
178 * \param tfm linux crypto algo transform
179 */
180 static int md5_hmac_init(struct shash_desc *desc)
181 {
182
183 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
184
185
186 mctx->dbn = 0; //dbn workaround
187
188 return 0;
189 }
190
191 /*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
192 * \ingroup IFX_MD5_HMAC_FUNCTIONS
193 * \brief on-the-fly md5 hmac computation
194 * \param tfm linux crypto algo transform
195 * \param data input data
196 * \param len size of input data
197 */
198 static int md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len)
199 {
200 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
201 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
202
203 mctx->byte_count += len;
204
205 if (avail > len) {
206 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
207 data, len);
208 return 0;
209 }
210
211 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
212 data, avail);
213
214 md5_hmac_transform(desc, mctx->block);
215 data += avail;
216 len -= avail;
217
218 while (len >= sizeof(mctx->block)) {
219 memcpy(mctx->block, data, sizeof(mctx->block));
220 md5_hmac_transform(desc, mctx->block);
221 data += sizeof(mctx->block);
222 len -= sizeof(mctx->block);
223 }
224
225 memcpy(mctx->block, data, len);
226 return 0;
227 }
228
229 /*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
230 * \ingroup IFX_MD5_HMAC_FUNCTIONS
231 * \brief compute final md5 hmac value
232 * \param tfm linux crypto algo transform
233 * \param out final md5 hmac output value
234 */
235 static int md5_hmac_final(struct shash_desc *desc, u8 *out)
236 {
237 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
238 const unsigned int offset = mctx->byte_count & 0x3f;
239 char *p = (char *)mctx->block + offset;
240 int padding = 56 - (offset + 1);
241 volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
242 unsigned long flag;
243 int i = 0;
244 int dbn;
245 u32 *in = mctx->temp[0];
246
247
248 *p++ = 0x80;
249 if (padding < 0) {
250 memset(p, 0x00, padding + sizeof (u64));
251 md5_hmac_transform(desc, mctx->block);
252 p = (char *)mctx->block;
253 padding = 56;
254 }
255
256 memset(p, 0, padding);
257 mctx->block[14] = le32_to_cpu((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
258 mctx->block[15] = 0x00000000;
259
260 md5_hmac_transform(desc, mctx->block);
261
262 CRTCL_SECT_HASH_START;
263
264 MD5_HASH_INIT;
265
266 md5_hmac_setkey_hw(mctx->key, mctx->keylen);
267
268 //printk("\ndbn = %d\n", mctx->dbn);
269 hashs->DBN = mctx->dbn;
270 asm("sync");
271
272 *IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
273
274 //wait for processing
275 while (hashs->controlr.BSY) {
276 // this will not take long
277 }
278
279 for (dbn = 0; dbn < mctx->dbn; dbn++)
280 {
281 for (i = 0; i < 16; i++) {
282 hashs->MR = in[i];
283 };
284
285 hashs->controlr.GO = 1;
286 asm("sync");
287
288 //wait for processing
289 while (hashs->controlr.BSY) {
290 // this will not take long
291 }
292
293 in += 16;
294 }
295
296
297 #if 1
298 //wait for digest ready
299 while (! hashs->controlr.DGRY) {
300 // this will not take long
301 }
302 #endif
303
304 *((u32 *) out + 0) = hashs->D1R;
305 *((u32 *) out + 1) = hashs->D2R;
306 *((u32 *) out + 2) = hashs->D3R;
307 *((u32 *) out + 3) = hashs->D4R;
308
309 /* reset the context after we finish with the hash */
310 mctx->byte_count = 0;
311 memset(&mctx->hash[0], 0, sizeof(MD5_HASH_WORDS));
312 memset(&mctx->block[0], 0, sizeof(MD5_BLOCK_WORDS));
313 memset(&mctx->temp[0], 0, MD5_HMAC_DBN_TEMP_SIZE);
314
315 CRTCL_SECT_HASH_END;
316
317
318 return 0;
319 }
320
321 /*! \fn void md5_hmac_init_tfm(struct crypto_tfm *tfm)
322 * \ingroup IFX_MD5_HMAC_FUNCTIONS
323 * \brief initialize pointers in md5_hmac_ctx
324 * \param tfm linux crypto algo transform
325 */
326 static int md5_hmac_init_tfm(struct crypto_tfm *tfm)
327 {
328 struct md5_hmac_ctx *mctx = crypto_tfm_ctx(tfm);
329 mctx->temp = kzalloc(4 * MD5_HMAC_DBN_TEMP_SIZE, GFP_KERNEL);
330 if (IS_ERR(mctx->temp)) return PTR_ERR(mctx->temp);
331 mctx->desc = kzalloc(sizeof(struct shash_desc), GFP_KERNEL);
332 if (IS_ERR(mctx->desc)) return PTR_ERR(mctx->desc);
333
334 return 0;
335 }
336
337 /*! \fn void md5_hmac_exit_tfm(struct crypto_tfm *tfm)
338 * \ingroup IFX_MD5_HMAC_FUNCTIONS
339 * \brief free pointers in md5_hmac_ctx
340 * \param tfm linux crypto algo transform
341 */
342 static void md5_hmac_exit_tfm(struct crypto_tfm *tfm)
343 {
344 struct md5_hmac_ctx *mctx = crypto_tfm_ctx(tfm);
345 kfree(mctx->temp);
346 kfree(mctx->desc);
347 }
348
349
350 /*
351 * \brief MD5_HMAC function mappings
352 */
353
354 static struct shash_alg ifxdeu_md5_hmac_alg = {
355 .digestsize = MD5_DIGEST_SIZE,
356 .init = md5_hmac_init,
357 .update = md5_hmac_update,
358 .final = md5_hmac_final,
359 .setkey = md5_hmac_setkey,
360 .descsize = sizeof(struct md5_hmac_ctx),
361 .base = {
362 .cra_name = "hmac(md5)",
363 .cra_driver_name= "ifxdeu-md5_hmac",
364 .cra_priority = 400,
365 .cra_ctxsize = sizeof(struct md5_hmac_ctx),
366 .cra_flags = CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
367 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
368 .cra_module = THIS_MODULE,
369 .cra_init = md5_hmac_init_tfm,
370 .cra_exit = md5_hmac_exit_tfm,
371 }
372 };
373
374 /*! \fn int ifxdeu_init_md5_hmac (void)
375 * \ingroup IFX_MD5_HMAC_FUNCTIONS
376 * \brief initialize md5 hmac driver
377 */
378 int ifxdeu_init_md5_hmac (void)
379 {
380
381 int ret = -ENOSYS;
382
383
384 if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg)))
385 goto md5_hmac_err;
386
387 printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
388 return ret;
389
390 md5_hmac_err:
391 printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
392 return ret;
393 }
394
395 /** \fn void ifxdeu_fini_md5_hmac (void)
396 * \ingroup IFX_MD5_HMAC_FUNCTIONS
397 * \brief unregister md5 hmac driver
398 */
399 void ifxdeu_fini_md5_hmac (void)
400 {
401 crypto_unregister_shash(&ifxdeu_md5_hmac_alg);
402 }
403
404
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