1 /******************************************************************************
3 ** FILE NAME : ifxmips_sha1_hmac.c
5 ** MODULES : DEU Module for UEIP
6 ** DATE : September 8, 2009
7 ** AUTHOR : Mohammad Firdaus
8 ** DESCRIPTION : Data Encryption Unit Driver
9 ** COPYRIGHT : Copyright (c) 2009
10 ** Infineon Technologies AG
11 ** Am Campeon 1-12, 85579 Neubiberg, Germany
13 ** This program is free software; you can redistribute it and/or modify
14 ** it under the terms of the GNU General Public License as published by
15 ** the Free Software Foundation; either version 2 of the License, or
16 ** (at your option) any later version.
19 ** $Date $Author $Comment
20 ** 08,Sept 2009 Mohammad Firdaus Initial UEIP release
21 ** 21,March 2011 Mohammad Firdaus Changes for Kernel 2.6.32 and IPSec integration
22 *******************************************************************************/
24 \defgroup IFX_DEU IFX_DEU_DRIVERS
26 \brief ifx deu driver module
30 \file ifxmips_sha1_hmac.c
32 \brief SHA1-HMAC deu driver file
36 \defgroup IFX_SHA1_HMAC_FUNCTIONS IFX_SHA1_HMAC_FUNCTIONS
38 \brief ifx sha1 hmac functions
43 #include <linux/init.h>
44 #include <linux/module.h>
46 #include <linux/crypto.h>
47 #include <linux/cryptohash.h>
48 #include <crypto/internal/hash.h>
49 #include <linux/types.h>
50 #include <asm/scatterlist.h>
51 #include <asm/byteorder.h>
52 #include <linux/delay.h>
54 #if defined(CONFIG_AR9)
55 #include "ifxmips_deu_ar9.h"
56 #elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
57 #include "ifxmips_deu_vr9.h"
59 #error "Plaform Unknwon!"
62 #define SHA1_DIGEST_SIZE 20
63 #define SHA1_HMAC_BLOCK_SIZE 64
64 #define SHA1_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround
65 #define HASH_START IFX_HASH_CON
67 #define SHA1_HMAC_MAX_KEYLEN 64
69 static spinlock_t lock
;
70 #define CRTCL_SECT_INIT spin_lock_init(&lock)
71 #define CRTCL_SECT_START spin_lock_irqsave(&lock, flag)
72 #define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag)
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);
78 #define DPRINTF(level, format, args...)
81 struct sha1_hmac_ctx
{
84 u8 buffer
[SHA1_HMAC_BLOCK_SIZE
];
85 u8 key
[SHA1_HMAC_MAX_KEYLEN
];
92 static u32 temp
[SHA1_HMAC_DBN_TEMP_SIZE
];
94 extern int disable_deudma
;
96 /*! \fn static void sha1_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
97 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
98 * \brief save input block to context
99 * \param tfm linux crypto algo transform
100 * \param in 64-byte block of input
102 static int sha1_hmac_transform(struct shash_desc
*desc
, u32
const *in
)
104 struct sha1_hmac_ctx
*sctx
= crypto_shash_ctx(desc
->tfm
);
106 memcpy(&temp
[sctx
->dbn
<<4], in
, 64); //dbn workaround
109 if ( (sctx
->dbn
<<4) > SHA1_HMAC_DBN_TEMP_SIZE
)
111 printk("SHA1_HMAC_DBN_TEMP_SIZE exceeded\n");
117 /*! \fn int sha1_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
118 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
119 * \brief sets sha1 hmac key
120 * \param tfm linux crypto algo transform
121 * \param key input key
122 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
124 static int sha1_hmac_setkey(struct crypto_shash
*tfm
, const u8
*key
, unsigned int keylen
)
126 struct sha1_hmac_ctx
*sctx
= crypto_shash_ctx(tfm
);
127 volatile struct deu_hash_t
*hashs
= (struct deu_hash_t
*) HASH_START
;
129 if (keylen
> SHA1_HMAC_MAX_KEYLEN
) {
130 printk("Key length exceeds maximum key length\n");
134 //printk("Setting keys of len: %d\n", keylen);
136 hashs
->KIDX
|= 0x80000000; //reset keys back to 0
137 memcpy(&sctx
->key
, key
, keylen
);
138 sctx
->keylen
= keylen
;
145 /*! \fn int sha1_hmac_setkey_hw(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
146 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
147 * \brief sets sha1 hmac key into hw registers
148 * \param tfm linux crypto algo transform
149 * \param key input key
150 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
152 static int sha1_hmac_setkey_hw(const u8
*key
, unsigned int keylen
)
154 volatile struct deu_hash_t
*hash
= (struct deu_hash_t
*) HASH_START
;
157 u32
*in_key
= (u32
*)key
;
162 for (i
= 0; i
< keylen
; i
+=4)
166 hash
->KEY
= *((u32
*) in_key
+ j
);
174 /*! \fn void sha1_hmac_init(struct crypto_tfm *tfm)
175 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
176 * \brief initialize sha1 hmac context
177 * \param tfm linux crypto algo transform
179 static int sha1_hmac_init(struct shash_desc
*desc
)
181 struct sha1_hmac_ctx
*sctx
= crypto_shash_ctx(desc
->tfm
);
183 //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
184 sctx
->dbn
= 0; //dbn workaround
185 sha1_hmac_setkey_hw(sctx
->key
, sctx
->keylen
);
190 /*! \fn static void sha1_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
191 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
192 * \brief on-the-fly sha1 hmac computation
193 * \param tfm linux crypto algo transform
194 * \param data input data
195 * \param len size of input data
197 static int sha1_hmac_update(struct shash_desc
*desc
, const u8
*data
,
200 struct sha1_hmac_ctx
*sctx
= crypto_shash_ctx(desc
->tfm
);
203 j
= (sctx
->count
>> 3) & 0x3f;
204 sctx
->count
+= len
<< 3;
205 // printk("sctx->count = %d\n", sctx->count);
207 if ((j
+ len
) > 63) {
208 memcpy (&sctx
->buffer
[j
], data
, (i
= 64 - j
));
209 sha1_hmac_transform (desc
, (const u32
*)sctx
->buffer
);
210 for (; i
+ 63 < len
; i
+= 64) {
211 sha1_hmac_transform (desc
, (const u32
*)&data
[i
]);
219 memcpy (&sctx
->buffer
[j
], &data
[i
], len
- i
);
223 /*! \fn static void sha1_hmac_final(struct crypto_tfm *tfm, u8 *out)
224 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
225 * \brief ompute final sha1 hmac value
226 * \param tfm linux crypto algo transform
227 * \param out final sha1 hmac output value
229 static int sha1_hmac_final(struct shash_desc
*desc
, u8
*out
)
231 //struct sha1_hmac_ctx *sctx = shash_desc_ctx(desc);
232 struct sha1_hmac_ctx
*sctx
= crypto_shash_ctx(desc
->tfm
);
236 static const u8 padding
[64] = { 0x80, };
237 volatile struct deu_hash_t
*hashs
= (struct deu_hash_t
*) HASH_START
;
243 t
= sctx
->count
+ 512; // need to add 512 bit of the IPAD operation
260 /* Pad out to 56 mod 64 */
261 index
= (sctx
->count
>> 3) & 0x3f;
262 padlen
= (index
< 56) ? (56 - index
) : ((64 + 56) - index
);
263 sha1_hmac_update (desc
, padding
, padlen
);
266 sha1_hmac_update (desc
, bits
, sizeof bits
);
270 hashs
->DBN
= sctx
->dbn
;
272 //for vr9 change, ENDI = 1
273 *IFX_HASH_CON
= HASH_CON_VALUE
;
275 //wait for processing
276 while (hashs
->controlr
.BSY
) {
277 // this will not take long
280 for (dbn
= 0; dbn
< sctx
->dbn
; dbn
++)
282 for (i
= 0; i
< 16; i
++) {
286 hashs
->controlr
.GO
= 1;
289 //wait for processing
290 while (hashs
->controlr
.BSY
) {
291 // this will not take long
299 //wait for digest ready
300 while (! hashs
->controlr
.DGRY
) {
301 // this will not take long
305 *((u32
*) out
+ 0) = hashs
->D1R
;
306 *((u32
*) out
+ 1) = hashs
->D2R
;
307 *((u32
*) out
+ 2) = hashs
->D3R
;
308 *((u32
*) out
+ 3) = hashs
->D4R
;
309 *((u32
*) out
+ 4) = hashs
->D5R
;
311 memset(&sctx
->buffer
[0], 0, SHA1_HMAC_BLOCK_SIZE
);
314 //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
323 * \brief SHA1-HMAC function mappings
325 static struct shash_alg ifxdeu_sha1_hmac_alg
= {
326 .digestsize
= SHA1_DIGEST_SIZE
,
327 .init
= sha1_hmac_init
,
328 .update
= sha1_hmac_update
,
329 .final
= sha1_hmac_final
,
330 .setkey
= sha1_hmac_setkey
,
331 .descsize
= sizeof(struct sha1_hmac_ctx
),
333 .cra_name
= "hmac(sha1)",
334 .cra_driver_name
= "ifxdeu-sha1_hmac",
335 .cra_ctxsize
= sizeof(struct sha1_hmac_ctx
),
336 .cra_flags
= CRYPTO_ALG_TYPE_DIGEST
,
337 .cra_blocksize
= SHA1_HMAC_BLOCK_SIZE
,
338 .cra_module
= THIS_MODULE
,
344 /*! \fn int __init ifxdeu_init_sha1_hmac (void)
345 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
346 * \brief initialize sha1 hmac driver
348 int __init
ifxdeu_init_sha1_hmac (void)
354 if ((ret
= crypto_register_shash(&ifxdeu_sha1_hmac_alg
)))
359 printk (KERN_NOTICE
"IFX DEU SHA1_HMAC initialized%s.\n", disable_deudma
? "" : " (DMA)");
363 printk(KERN_ERR
"IFX DEU SHA1_HMAC initialization failed!\n");
367 /*! \fn void __exit ifxdeu_fini_sha1_hmac (void)
368 * \ingroup IFX_SHA1_HMAC_FUNCTIONS
369 * \brief unregister sha1 hmac driver
371 void __exit
ifxdeu_fini_sha1_hmac (void)
374 crypto_unregister_shash(&ifxdeu_sha1_hmac_alg
);