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1 office 1 /******************************************************************************
2 **
3 ** FILE NAME : ifxmips_sha1.c
4 ** PROJECT : IFX UEIP
5 ** MODULES : DEU Module for Danube
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_sha1.c
31 \ingroup IFX_DEU
32 \brief SHA1 encryption deu driver file
33 */
34  
35 /*!
36 \defgroup IFX_SHA1_FUNCTIONS IFX_SHA1_FUNCTIONS
37 \ingroup IFX_DEU
38 \brief ifx deu sha1 functions
39 */
40  
41  
42 /* Project header */
43 #include <linux/init.h>
44 #include <linux/module.h>
45 #include <linux/mm.h>
46 #include <linux/crypto.h>
47 #include <linux/cryptohash.h>
48 #include <crypto/sha.h>
49 #include <crypto/internal/hash.h>
50 #include <linux/types.h>
51 #include <linux/scatterlist.h>
52 #include <asm/byteorder.h>
53  
54 #if defined(CONFIG_DANUBE)
55 #include "ifxmips_deu_danube.h"
56 #elif defined(CONFIG_AR9)
57 #include "ifxmips_deu_ar9.h"
58 #elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
59 #include "ifxmips_deu_vr9.h"
60 #else
61 #error "Plaform Unknwon!"
62 #endif
63  
64 #define SHA1_DIGEST_SIZE 20
65 #define SHA1_HMAC_BLOCK_SIZE 64
66 #define HASH_START IFX_HASH_CON
67  
68 static spinlock_t lock;
69 #define CRTCL_SECT_INIT spin_lock_init(&lock)
70 #define CRTCL_SECT_START spin_lock_irqsave(&lock, flag)
71 #define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag)
72  
73 //#define CRYPTO_DEBUG
74 #ifdef CRYPTO_DEBUG
75 extern char debug_level;
76 #define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
77 #else
78 #define DPRINTF(level, format, args...)
79 #endif
80  
81 /*
82 * \brief SHA1 private structure
83 */
84 struct sha1_ctx {
85 int started;
86 u64 count;
87 u32 hash[5];
88 u32 state[5];
89 u8 buffer[64];
90 };
91  
92 extern int disable_deudma;
93  
94  
95 /*! \fn static void sha1_transform (u32 *state, const u32 *in)
96 * \ingroup IFX_SHA1_FUNCTIONS
97 * \brief main interface to sha1 hardware
98 * \param state current state
99 * \param in 64-byte block of input
100 */
101 static void sha1_transform (struct sha1_ctx *sctx, u32 *state, const u32 *in)
102 {
103 int i = 0;
104 volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
105 unsigned long flag;
106  
107 CRTCL_SECT_START;
108  
109 /* For context switching purposes, the previous hash output
110 * is loaded back into the output register
111 */
112 if (sctx->started) {
113 hashs->D1R = *((u32 *) sctx->hash + 0);
114 hashs->D2R = *((u32 *) sctx->hash + 1);
115 hashs->D3R = *((u32 *) sctx->hash + 2);
116 hashs->D4R = *((u32 *) sctx->hash + 3);
117 hashs->D5R = *((u32 *) sctx->hash + 4);
118 }
119  
120 for (i = 0; i < 16; i++) {
121 hashs->MR = in[i];
122 };
123  
124 //wait for processing
125 while (hashs->controlr.BSY) {
126 // this will not take long
127 }
128  
129 /* For context switching purposes, the output is saved into a
130 * context struct which can be used later on
131 */
132 *((u32 *) sctx->hash + 0) = hashs->D1R;
133 *((u32 *) sctx->hash + 1) = hashs->D2R;
134 *((u32 *) sctx->hash + 2) = hashs->D3R;
135 *((u32 *) sctx->hash + 3) = hashs->D4R;
136 *((u32 *) sctx->hash + 4) = hashs->D5R;
137  
138 sctx->started = 1;
139  
140 CRTCL_SECT_END;
141 }
142  
143 /*! \fn static void sha1_init(struct crypto_tfm *tfm)
144 * \ingroup IFX_SHA1_FUNCTIONS
145 * \brief initialize sha1 hardware
146 * \param tfm linux crypto algo transform
147 */
148 static int sha1_init(struct shash_desc *desc)
149 {
150 struct sha1_ctx *sctx = shash_desc_ctx(desc);
151  
152 SHA_HASH_INIT;
153  
154 sctx->started = 0;
155 sctx->count = 0;
156 return 0;
157 }
158  
159 /*! \fn static void sha1_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
160 * \ingroup IFX_SHA1_FUNCTIONS
161 * \brief on-the-fly sha1 computation
162 * \param tfm linux crypto algo transform
163 * \param data input data
164 * \param len size of input data
165 */
166 static int sha1_update(struct shash_desc * desc, const u8 *data,
167 unsigned int len)
168 {
169 struct sha1_ctx *sctx = shash_desc_ctx(desc);
170 unsigned int i, j;
171  
172 j = (sctx->count >> 3) & 0x3f;
173 sctx->count += len << 3;
174  
175 if ((j + len) > 63) {
176 memcpy (&sctx->buffer[j], data, (i = 64 - j));
177 sha1_transform (sctx, sctx->state, (const u32 *)sctx->buffer);
178 for (; i + 63 < len; i += 64) {
179 sha1_transform (sctx, sctx->state, (const u32 *)&data[i]);
180 }
181  
182 j = 0;
183 }
184 else
185 i = 0;
186  
187 memcpy (&sctx->buffer[j], &data[i], len - i);
188 return 0;
189 }
190  
191 /*! \fn static void sha1_final(struct crypto_tfm *tfm, u8 *out)
192 * \ingroup IFX_SHA1_FUNCTIONS
193 * \brief compute final sha1 value
194 * \param tfm linux crypto algo transform
195 * \param out final md5 output value
196 */
197 static int sha1_final(struct shash_desc *desc, u8 *out)
198 {
199 struct sha1_ctx *sctx = shash_desc_ctx(desc);
200 u32 index, padlen;
201 u64 t;
202 u8 bits[8] = { 0, };
203 static const u8 padding[64] = { 0x80, };
204 volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
205 unsigned long flag;
206  
207 t = sctx->count;
208 bits[7] = 0xff & t;
209 t >>= 8;
210 bits[6] = 0xff & t;
211 t >>= 8;
212 bits[5] = 0xff & t;
213 t >>= 8;
214 bits[4] = 0xff & t;
215 t >>= 8;
216 bits[3] = 0xff & t;
217 t >>= 8;
218 bits[2] = 0xff & t;
219 t >>= 8;
220 bits[1] = 0xff & t;
221 t >>= 8;
222 bits[0] = 0xff & t;
223  
224 /* Pad out to 56 mod 64 */
225 index = (sctx->count >> 3) & 0x3f;
226 padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
227 sha1_update (desc, padding, padlen);
228  
229 /* Append length */
230 sha1_update (desc, bits, sizeof bits);
231  
232 CRTCL_SECT_START;
233  
234 *((u32 *) out + 0) = hashs->D1R;
235 *((u32 *) out + 1) = hashs->D2R;
236 *((u32 *) out + 2) = hashs->D3R;
237 *((u32 *) out + 3) = hashs->D4R;
238 *((u32 *) out + 4) = hashs->D5R;
239  
240 CRTCL_SECT_END;
241  
242 // Wipe context
243 memset (sctx, 0, sizeof *sctx);
244  
245 return 0;
246 }
247  
248 /*
249 * \brief SHA1 function mappings
250 */
251 static struct shash_alg ifxdeu_sha1_alg = {
252 .digestsize = SHA1_DIGEST_SIZE,
253 .init = sha1_init,
254 .update = sha1_update,
255 .final = sha1_final,
256 .descsize = sizeof(struct sha1_ctx),
257 .statesize = sizeof(struct sha1_state),
258 .base = {
259 .cra_name = "sha1",
260 .cra_driver_name= "ifxdeu-sha1",
261 .cra_priority = 300,
262 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
263 .cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
264 .cra_module = THIS_MODULE,
265 }
266 };
267  
268  
269 /*! \fn int ifxdeu_init_sha1 (void)
270 * \ingroup IFX_SHA1_FUNCTIONS
271 * \brief initialize sha1 driver
272 */
273 int ifxdeu_init_sha1 (void)
274 {
275 int ret = -ENOSYS;
276  
277  
278 if ((ret = crypto_register_shash(&ifxdeu_sha1_alg)))
279 goto sha1_err;
280  
281 CRTCL_SECT_INIT;
282  
283 printk (KERN_NOTICE "IFX DEU SHA1 initialized%s.\n", disable_deudma ? "" : " (DMA)");
284 return ret;
285  
286 sha1_err:
287 printk(KERN_ERR "IFX DEU SHA1 initialization failed!\n");
288 return ret;
289 }
290  
291 /*! \fn void ifxdeu_fini_sha1 (void)
292 * \ingroup IFX_SHA1_FUNCTIONS
293 * \brief unregister sha1 driver
294 */
295 void ifxdeu_fini_sha1 (void)
296 {
297 crypto_unregister_shash(&ifxdeu_sha1_alg);
298  
299  
300 }
301  
302