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ltq-deu: changes for hash multithread callers and md5 endianess
[openwrt/staging/stintel.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 };
84
85 static u32 temp[MD5_HMAC_DBN_TEMP_SIZE];
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(&temp[mctx->dbn<<4], 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 //printk("copying keys to context with length %d\n", keylen);
120
121 if (keylen > MAX_HASH_KEYLEN) {
122 printk("Key length more than what DEU hash can handle\n");
123 return -EINVAL;
124 }
125
126
127 memcpy(&mctx->key, key, keylen);
128 mctx->keylen = keylen;
129
130 return 0;
131
132 }
133
134
135 /*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
136 * \ingroup IFX_MD5_HMAC_FUNCTIONS
137 * \brief sets md5 hmac key into the hardware registers
138 * \param key input key
139 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
140 */
141
142 static int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
143 {
144 volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
145 int i, j;
146 u32 *in_key = (u32 *)key;
147
148 //printk("\nsetkey keylen: %d\n key: ", keylen);
149
150 hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0'
151 j = 0;
152 for (i = 0; i < keylen; i+=4)
153 {
154 hash->KIDX = j;
155 asm("sync");
156 hash->KEY = *((u32 *) in_key + j);
157 asm("sync");
158 j++;
159 }
160
161 return 0;
162 }
163
164 /*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
165 * \ingroup IFX_MD5_HMAC_FUNCTIONS
166 * \brief initialize md5 hmac context
167 * \param tfm linux crypto algo transform
168 */
169 static int md5_hmac_init(struct shash_desc *desc)
170 {
171
172 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
173
174
175 mctx->dbn = 0; //dbn workaround
176
177 return 0;
178 }
179
180 /*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
181 * \ingroup IFX_MD5_HMAC_FUNCTIONS
182 * \brief on-the-fly md5 hmac computation
183 * \param tfm linux crypto algo transform
184 * \param data input data
185 * \param len size of input data
186 */
187 static int md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len)
188 {
189 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
190 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
191
192 mctx->byte_count += len;
193
194 if (avail > len) {
195 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
196 data, len);
197 return 0;
198 }
199
200 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
201 data, avail);
202
203 md5_hmac_transform(desc, mctx->block);
204 data += avail;
205 len -= avail;
206
207 while (len >= sizeof(mctx->block)) {
208 memcpy(mctx->block, data, sizeof(mctx->block));
209 md5_hmac_transform(desc, mctx->block);
210 data += sizeof(mctx->block);
211 len -= sizeof(mctx->block);
212 }
213
214 memcpy(mctx->block, data, len);
215 return 0;
216 }
217
218 /*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
219 * \ingroup IFX_MD5_HMAC_FUNCTIONS
220 * \brief compute final md5 hmac value
221 * \param tfm linux crypto algo transform
222 * \param out final md5 hmac output value
223 */
224 static int md5_hmac_final(struct shash_desc *desc, u8 *out)
225 {
226 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
227 const unsigned int offset = mctx->byte_count & 0x3f;
228 char *p = (char *)mctx->block + offset;
229 int padding = 56 - (offset + 1);
230 volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
231 unsigned long flag;
232 int i = 0;
233 int dbn;
234 u32 *in = &temp[0];
235
236
237 *p++ = 0x80;
238 if (padding < 0) {
239 memset(p, 0x00, padding + sizeof (u64));
240 md5_hmac_transform(desc, mctx->block);
241 p = (char *)mctx->block;
242 padding = 56;
243 }
244
245 memset(p, 0, padding);
246 mctx->block[14] = le32_to_cpu((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
247 mctx->block[15] = 0x00000000;
248
249 md5_hmac_transform(desc, mctx->block);
250
251 CRTCL_SECT_HASH_START;
252
253 MD5_HASH_INIT;
254
255 md5_hmac_setkey_hw(mctx->key, mctx->keylen);
256
257 //printk("\ndbn = %d\n", mctx->dbn);
258 hashs->DBN = mctx->dbn;
259 asm("sync");
260
261 *IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
262
263 //wait for processing
264 while (hashs->controlr.BSY) {
265 // this will not take long
266 }
267
268 for (dbn = 0; dbn < mctx->dbn; dbn++)
269 {
270 for (i = 0; i < 16; i++) {
271 hashs->MR = in[i];
272 };
273
274 hashs->controlr.GO = 1;
275 asm("sync");
276
277 //wait for processing
278 while (hashs->controlr.BSY) {
279 // this will not take long
280 }
281
282 in += 16;
283 }
284
285
286 #if 1
287 //wait for digest ready
288 while (! hashs->controlr.DGRY) {
289 // this will not take long
290 }
291 #endif
292
293 *((u32 *) out + 0) = hashs->D1R;
294 *((u32 *) out + 1) = hashs->D2R;
295 *((u32 *) out + 2) = hashs->D3R;
296 *((u32 *) out + 3) = hashs->D4R;
297
298 /* reset the context after we finish with the hash */
299 mctx->byte_count = 0;
300 memset(&mctx->hash[0], 0, sizeof(MD5_HASH_WORDS));
301 memset(&mctx->block[0], 0, sizeof(MD5_BLOCK_WORDS));
302 memset(&temp[0], 0, MD5_HMAC_DBN_TEMP_SIZE);
303
304 CRTCL_SECT_HASH_END;
305
306
307 return 0;
308 }
309
310 /*
311 * \brief MD5_HMAC function mappings
312 */
313
314 static struct shash_alg ifxdeu_md5_hmac_alg = {
315 .digestsize = MD5_DIGEST_SIZE,
316 .init = md5_hmac_init,
317 .update = md5_hmac_update,
318 .final = md5_hmac_final,
319 .setkey = md5_hmac_setkey,
320 .descsize = sizeof(struct md5_hmac_ctx),
321 .base = {
322 .cra_name = "hmac(md5)",
323 .cra_driver_name= "ifxdeu-md5_hmac",
324 .cra_priority = 400,
325 .cra_ctxsize = sizeof(struct md5_hmac_ctx),
326 .cra_flags = CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
327 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
328 .cra_module = THIS_MODULE,
329 }
330 };
331
332 /*! \fn int ifxdeu_init_md5_hmac (void)
333 * \ingroup IFX_MD5_HMAC_FUNCTIONS
334 * \brief initialize md5 hmac driver
335 */
336 int ifxdeu_init_md5_hmac (void)
337 {
338
339 int ret = -ENOSYS;
340
341
342 if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg)))
343 goto md5_hmac_err;
344
345 printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
346 return ret;
347
348 md5_hmac_err:
349 printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
350 return ret;
351 }
352
353 /** \fn void ifxdeu_fini_md5_hmac (void)
354 * \ingroup IFX_MD5_HMAC_FUNCTIONS
355 * \brief unregister md5 hmac driver
356 */
357 void ifxdeu_fini_md5_hmac (void)
358 {
359 crypto_unregister_shash(&ifxdeu_md5_hmac_alg);
360 }
361
362
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