1 /******************************************************************************
3 ** FILE NAME : ifxmips_md5_hmac.c
5 ** MODULES : DEU Module for UEIP
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
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.
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 *******************************************************************************/
25 \defgroup IFX_DEU IFX_DEU_DRIVERS
27 \brief ifx deu driver module
31 \file ifxmips_md5_hmac.c
33 \brief MD5-HMAC encryption deu driver file
37 \defgroup IFX_MD5_HMAC_FUNCTIONS IFX_MD5_HMAC_FUNCTIONS
39 \brief ifx md5-hmac driver functions
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>
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"
56 #error "Plaform Unknwon!"
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
66 static spinlock_t lock;
67 #define CRTCL_SECT_INIT spin_lock_init(&lock)
68 #define CRTCL_SECT_START spin_lock_irqsave(&lock, flag)
69 #define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag)
71 //#define CRYPTO_DEBUG
73 extern char debug_level;
74 #define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
76 #define DPRINTF(level, format, args...)
79 #define MAX_HASH_KEYLEN 64
82 u8 key[MAX_HASH_KEYLEN];
83 u32 hash[MD5_HASH_WORDS];
84 u32 block[MD5_BLOCK_WORDS];
90 static u32 temp[MD5_HMAC_DBN_TEMP_SIZE];
92 extern int disable_deudma;
94 /*! \fn static u32 endian_swap(u32 input)
95 * \ingroup IFX_MD5_HMAC_FUNCTIONS
96 * \brief perform dword level endian swap
97 * \param input value of dword that requires to be swapped
99 static u32 endian_swap(u32 input)
101 u8 *ptr = (u8 *)&input;
103 return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
106 /*! \fn static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
107 * \ingroup IFX_MD5_HMAC_FUNCTIONS
108 * \brief save input block to context
109 * \param tfm linux crypto algo transform
110 * \param in 64-byte block of input
112 static void md5_hmac_transform(struct shash_desc *desc, u32 const *in)
114 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
116 memcpy(&temp[mctx->dbn<<4], in, 64); //dbn workaround
119 if ( (mctx->dbn<<4) > MD5_HMAC_DBN_TEMP_SIZE )
121 printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n");
126 /*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
127 * \ingroup IFX_MD5_HMAC_FUNCTIONS
128 * \brief sets md5 hmac key
129 * \param tfm linux crypto algo transform
130 * \param key input key
131 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
133 static int md5_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
135 struct md5_hmac_ctx *mctx = crypto_shash_ctx(tfm);
136 volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
137 //printk("copying keys to context with length %d\n", keylen);
139 if (keylen > MAX_HASH_KEYLEN) {
140 printk("Key length more than what DEU hash can handle\n");
145 hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0'
146 memcpy(&mctx->key, key, keylen);
147 mctx->keylen = keylen;
154 /*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
155 * \ingroup IFX_MD5_HMAC_FUNCTIONS
156 * \brief sets md5 hmac key into the hardware registers
157 * \param key input key
158 * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
161 static int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
163 volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
166 u32 *in_key = (u32 *)key;
168 //printk("\nsetkey keylen: %d\n key: ", keylen);
172 for (i = 0; i < keylen; i+=4)
176 hash->KEY = *((u32 *) in_key + j);
185 /*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
186 * \ingroup IFX_MD5_HMAC_FUNCTIONS
187 * \brief initialize md5 hmac context
188 * \param tfm linux crypto algo transform
190 static int md5_hmac_init(struct shash_desc *desc)
193 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
196 mctx->dbn = 0; //dbn workaround
197 md5_hmac_setkey_hw(mctx->key, mctx->keylen);
201 EXPORT_SYMBOL(md5_hmac_init);
203 /*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
204 * \ingroup IFX_MD5_HMAC_FUNCTIONS
205 * \brief on-the-fly md5 hmac computation
206 * \param tfm linux crypto algo transform
207 * \param data input data
208 * \param len size of input data
210 static int md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len)
212 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
213 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
215 mctx->byte_count += len;
218 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
223 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
226 md5_hmac_transform(desc, mctx->block);
230 while (len >= sizeof(mctx->block)) {
231 memcpy(mctx->block, data, sizeof(mctx->block));
232 md5_hmac_transform(desc, mctx->block);
233 data += sizeof(mctx->block);
234 len -= sizeof(mctx->block);
237 memcpy(mctx->block, data, len);
240 EXPORT_SYMBOL(md5_hmac_update);
242 /*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
243 * \ingroup IFX_MD5_HMAC_FUNCTIONS
244 * \brief compute final md5 hmac value
245 * \param tfm linux crypto algo transform
246 * \param out final md5 hmac output value
248 static int md5_hmac_final(struct shash_desc *desc, u8 *out)
250 struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
251 const unsigned int offset = mctx->byte_count & 0x3f;
252 char *p = (char *)mctx->block + offset;
253 int padding = 56 - (offset + 1);
254 volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
263 memset(p, 0x00, padding + sizeof (u64));
264 md5_hmac_transform(desc, mctx->block);
265 p = (char *)mctx->block;
269 memset(p, 0, padding);
270 mctx->block[14] = endian_swap((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
271 mctx->block[15] = 0x00000000;
273 md5_hmac_transform(desc, mctx->block);
277 //printk("\ndbn = %d\n", mctx->dbn);
278 hashs->DBN = mctx->dbn;
281 *IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
283 //wait for processing
284 while (hashs->controlr.BSY) {
285 // this will not take long
288 for (dbn = 0; dbn < mctx->dbn; dbn++)
290 for (i = 0; i < 16; i++) {
294 hashs->controlr.GO = 1;
297 //wait for processing
298 while (hashs->controlr.BSY) {
299 // this will not take long
307 //wait for digest ready
308 while (! hashs->controlr.DGRY) {
309 // this will not take long
313 *((u32 *) out + 0) = hashs->D1R;
314 *((u32 *) out + 1) = hashs->D2R;
315 *((u32 *) out + 2) = hashs->D3R;
316 *((u32 *) out + 3) = hashs->D4R;
317 *((u32 *) out + 4) = hashs->D5R;
319 /* reset the context after we finish with the hash */
320 mctx->byte_count = 0;
321 memset(&mctx->hash[0], 0, sizeof(MD5_HASH_WORDS));
322 memset(&mctx->block[0], 0, sizeof(MD5_BLOCK_WORDS));
323 memset(&temp[0], 0, MD5_HMAC_DBN_TEMP_SIZE);
331 EXPORT_SYMBOL(md5_hmac_final);
334 * \brief MD5_HMAC function mappings
337 static struct shash_alg ifxdeu_md5_hmac_alg = {
338 .digestsize = MD5_DIGEST_SIZE,
339 .init = md5_hmac_init,
340 .update = md5_hmac_update,
341 .final = md5_hmac_final,
342 .setkey = md5_hmac_setkey,
343 .descsize = sizeof(struct md5_hmac_ctx),
345 .cra_name = "hmac(md5)",
346 .cra_driver_name= "ifxdeu-md5_hmac",
347 .cra_ctxsize = sizeof(struct md5_hmac_ctx),
348 .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
349 .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
350 .cra_module = THIS_MODULE,
354 /*! \fn int __init ifxdeu_init_md5_hmac (void)
355 * \ingroup IFX_MD5_HMAC_FUNCTIONS
356 * \brief initialize md5 hmac driver
358 int __init ifxdeu_init_md5_hmac (void)
364 if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg)))
369 printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
373 printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
377 /** \fn void __exit ifxdeu_fini_md5_hmac (void)
378 * \ingroup IFX_MD5_HMAC_FUNCTIONS
379 * \brief unregister md5 hmac driver
381 void __exit ifxdeu_fini_md5_hmac (void)
383 crypto_unregister_shash(&ifxdeu_md5_hmac_alg);