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 u32 endian_swap(u32 input)
  90  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
  91  *  \brief perform dword level endian swap
  92  *  \param input value of dword that requires to be swapped
  93 */
  94 static u32 endian_swap(u32 input)
  95 {
  96     u8 *ptr = (u8 *)&input;
  97
  98     return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
  99 }
 100
 101 /*! \fn static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
 102  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 103  *  \brief save input block to context
 104  *  \param tfm linux crypto algo transform
 105  *  \param in 64-byte block of input
 106 */
 107 static void md5_hmac_transform(struct shash_desc *desc, u32 const *in)
 108 {
 109     struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
 110
 111     memcpy(&temp[mctx->dbn<<4], in, 64); //dbn workaround
 112     mctx->dbn += 1;
 113
 114     if ( (mctx->dbn<<4) > MD5_HMAC_DBN_TEMP_SIZE )
 115     {
 116         printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n");
 117     }
 118
 119 }
 120
 121 /*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 122  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 123  *  \brief sets md5 hmac key
 124  *  \param tfm linux crypto algo transform
 125  *  \param key input key
 126  *  \param keylen key length greater than 64 bytes IS NOT SUPPORTED
 127 */
 128 static int md5_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
 129 {
 130     struct md5_hmac_ctx *mctx = crypto_shash_ctx(tfm);
 131     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 132     //printk("copying keys to context with length %d\n", keylen);
 133
 134     if (keylen > MAX_HASH_KEYLEN) {
 135         printk("Key length more than what DEU hash can handle\n");
 136         return -EINVAL;
 137     }
 138
 139
 140     hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0'
 141     memcpy(&mctx->key, key, keylen);
 142     mctx->keylen = keylen;
 143
 144     return 0;
 145
 146 }
 147
 148
 149 /*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
 150  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 151  *  \brief sets md5 hmac key into the hardware registers
 152  *  \param key input key
 153  *  \param keylen key length greater than 64 bytes IS NOT SUPPORTED
 154 */
 155
 156 static int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
 157 {
 158     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 159     unsigned long flag;
 160     int i, j;
 161     u32 *in_key = (u32 *)key;
 162
 163     //printk("\nsetkey keylen: %d\n key: ", keylen);
 164
 165     CRTCL_SECT_HASH_START;
 166     j = 0;
 167     for (i = 0; i < keylen; i+=4)
 168     {
 169          hash->KIDX = j;
 170          asm("sync");
 171          hash->KEY = *((u32 *) in_key + j);
 172          asm("sync");
 173          j++;
 174     }
 175     CRTCL_SECT_HASH_END;
 176
 177     return 0;
 178 }
 179
 180 /*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
 181  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 182  *  \brief initialize md5 hmac context
 183  *  \param tfm linux crypto algo transform
 184 */
 185 static int md5_hmac_init(struct shash_desc *desc)
 186 {
 187
 188     struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
 189
 190
 191     mctx->dbn = 0; //dbn workaround
 192     md5_hmac_setkey_hw(mctx->key, mctx->keylen);
 193
 194     return 0;
 195 }
 196
 197 /*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 198  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 199  *  \brief on-the-fly md5 hmac computation
 200  *  \param tfm linux crypto algo transform
 201  *  \param data input data
 202  *  \param len size of input data
 203 */
 204 static int md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 205 {
 206     struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
 207     const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 208
 209     mctx->byte_count += len;
 210
 211     if (avail > len) {
 212         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 213                data, len);
 214         return 0;
 215     }
 216
 217     memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 218            data, avail);
 219
 220     md5_hmac_transform(desc, mctx->block);
 221     data += avail;
 222     len -= avail;
 223
 224     while (len >= sizeof(mctx->block)) {
 225         memcpy(mctx->block, data, sizeof(mctx->block));
 226         md5_hmac_transform(desc, mctx->block);
 227         data += sizeof(mctx->block);
 228         len -= sizeof(mctx->block);
 229     }
 230
 231     memcpy(mctx->block, data, len);
 232     return 0;
 233 }
 234
 235 /*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
 236  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 237  *  \brief compute final md5 hmac value
 238  *  \param tfm linux crypto algo transform
 239  *  \param out final md5 hmac output value
 240 */
 241 static int md5_hmac_final(struct shash_desc *desc, u8 *out)
 242 {
 243     struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
 244     const unsigned int offset = mctx->byte_count & 0x3f;
 245     char *p = (char *)mctx->block + offset;
 246     int padding = 56 - (offset + 1);
 247     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 248     unsigned long flag;
 249     int i = 0;
 250     int dbn;
 251     u32 *in = &temp[0];
 252
 253
 254     *p++ = 0x80;
 255     if (padding < 0) {
 256         memset(p, 0x00, padding + sizeof (u64));
 257         md5_hmac_transform(desc, mctx->block);
 258         p = (char *)mctx->block;
 259         padding = 56;
 260     }
 261
 262     memset(p, 0, padding);
 263     mctx->block[14] = endian_swap((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
 264     mctx->block[15] = 0x00000000;
 265
 266     md5_hmac_transform(desc, mctx->block);
 267
 268     CRTCL_SECT_HASH_START;
 269
 270     //printk("\ndbn = %d\n", mctx->dbn);
 271     hashs->DBN = mctx->dbn;
 272     asm("sync");
 273
 274     *IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
 275
 276     //wait for processing
 277     while (hashs->controlr.BSY) {
 278         // this will not take long
 279     }
 280
 281     for (dbn = 0; dbn < mctx->dbn; dbn++)
 282     {
 283         for (i = 0; i < 16; i++) {
 284             hashs->MR = in[i];
 285         };
 286
 287         hashs->controlr.GO = 1;
 288         asm("sync");
 289
 290         //wait for processing
 291         while (hashs->controlr.BSY) {
 292            // this will not take long
 293         }
 294
 295         in += 16;
 296 }
 297
 298
 299 #if 1
 300     //wait for digest ready
 301     while (! hashs->controlr.DGRY) {
 302         // this will not take long
 303     }
 304 #endif
 305
 306     *((u32 *) out + 0) = hashs->D1R;
 307     *((u32 *) out + 1) = hashs->D2R;
 308     *((u32 *) out + 2) = hashs->D3R;
 309     *((u32 *) out + 3) = hashs->D4R;
 310     *((u32 *) out + 4) = hashs->D5R;
 311
 312     /* reset the context after we finish with the hash */
 313     mctx->byte_count = 0;
 314     memset(&mctx->hash[0], 0, sizeof(MD5_HASH_WORDS));
 315     memset(&mctx->block[0], 0, sizeof(MD5_BLOCK_WORDS));
 316     memset(&temp[0], 0, MD5_HMAC_DBN_TEMP_SIZE);
 317
 318     CRTCL_SECT_HASH_END;
 319
 320
 321    return 0;
 322 }
 323
 324 /*
 325  * \brief MD5_HMAC function mappings
 326 */
 327
 328 static struct shash_alg ifxdeu_md5_hmac_alg = {
 329     .digestsize         =       MD5_DIGEST_SIZE,
 330     .init               =       md5_hmac_init,
 331     .update             =       md5_hmac_update,
 332     .final              =       md5_hmac_final,
 333     .setkey             =       md5_hmac_setkey,
 334     .descsize           =       sizeof(struct md5_hmac_ctx),
 335     .base               =       {
 336         .cra_name       =       "hmac(md5)",
 337         .cra_driver_name=       "ifxdeu-md5_hmac",
 338         .cra_priority   =       400,
 339         .cra_ctxsize    =       sizeof(struct md5_hmac_ctx),
 340         .cra_flags      =       CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
 341         .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
 342         .cra_module     =       THIS_MODULE,
 343         }
 344 };
 345
 346 /*! \fn int ifxdeu_init_md5_hmac (void)
 347  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 348  *  \brief initialize md5 hmac driver
 349 */
 350 int ifxdeu_init_md5_hmac (void)
 351 {
 352
 353     int ret = -ENOSYS;
 354
 355
 356     if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg)))
 357         goto md5_hmac_err;
 358
 359     printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
 360     return ret;
 361
 362 md5_hmac_err:
 363     printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
 364     return ret;
 365 }
 366
 367 /** \fn void ifxdeu_fini_md5_hmac (void)
 368  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 369  *  \brief unregister md5 hmac driver
 370 */
 371 void ifxdeu_fini_md5_hmac (void)
 372 {
 373     crypto_unregister_shash(&ifxdeu_md5_hmac_alg);
 374 }
 375
 376