package/kernel/lantiq/ltq-deu/src/ifxmips_sha1_hmac.c

   1 /******************************************************************************
   2 **
   3 ** FILE NAME    : ifxmips_sha1_hmac.c
   4 ** PROJECT      : IFX UEIP
   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
  12 **
  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.
  17 **
  18 ** HISTORY
  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 *******************************************************************************/
  23 /*!
  24   \defgroup IFX_DEU IFX_DEU_DRIVERS
  25   \ingroup API
  26   \brief ifx deu driver module
  27 */
  28
  29 /*!
  30   \file ifxmips_sha1_hmac.c
  31   \ingroup IFX_DEU
  32   \brief SHA1-HMAC deu driver file
  33 */
  34
  35 /*!
  36   \defgroup IFX_SHA1_HMAC_FUNCTIONS IFX_SHA1_HMAC_FUNCTIONS
  37   \ingroup IFX_DEU
  38   \brief ifx sha1 hmac 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 <crypto/internal/hash.h>
  48 #include <crypto/sha.h>
  49 #include <linux/types.h>
  50 #include <linux/scatterlist.h>
  51 #include <asm/byteorder.h>
  52 #include <linux/delay.h>
  53
  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"
  58 #else
  59 #error "Plaform Unknwon!"
  60 #endif
  61
  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
  66
  67 #define SHA1_HMAC_MAX_KEYLEN 64
  68
  69 #ifdef CRYPTO_DEBUG
  70 extern char debug_level;
  71 #define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
  72 #else
  73 #define DPRINTF(level, format, args...)
  74 #endif
  75
  76 struct sha1_hmac_ctx {
  77     int keylen;
  78
  79     u8 buffer[SHA1_HMAC_BLOCK_SIZE];
  80     u8 key[SHA1_HMAC_MAX_KEYLEN];
  81     u32 state[5];
  82     u32 dbn;
  83     u64 count;
  84
  85 };
  86
  87 static u32 temp[SHA1_HMAC_DBN_TEMP_SIZE];
  88
  89 extern int disable_deudma;
  90
  91 /*! \fn static void sha1_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
  92  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
  93  *  \brief save input block to context
  94  *  \param tfm linux crypto algo transform
  95  *  \param in 64-byte block of input
  96 */
  97 static int sha1_hmac_transform(struct shash_desc *desc, u32 const *in)
  98 {
  99     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 100
 101     memcpy(&temp[sctx->dbn<<4], in, 64); //dbn workaround
 102     sctx->dbn += 1;
 103
 104     if ( (sctx->dbn<<4) > SHA1_HMAC_DBN_TEMP_SIZE )
 105     {
 106         printk("SHA1_HMAC_DBN_TEMP_SIZE exceeded\n");
 107     }
 108
 109     return 0;
 110 }
 111
 112 /*! \fn int sha1_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 113  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 114  *  \brief sets sha1 hmac key
 115  *  \param tfm linux crypto algo transform
 116  *  \param key input key
 117  *  \param keylen key length greater than 64 bytes IS NOT SUPPORTED
 118 */
 119 static int sha1_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
 120 {
 121     struct sha1_hmac_ctx *sctx = crypto_shash_ctx(tfm);
 122
 123     if (keylen > SHA1_HMAC_MAX_KEYLEN) {
 124         printk("Key length exceeds maximum key length\n");
 125         return -EINVAL;
 126     }
 127
 128     //printk("Setting keys of len: %d\n", keylen);
 129
 130     memcpy(&sctx->key, key, keylen);
 131     sctx->keylen = keylen;
 132
 133     return 0;
 134
 135 }
 136
 137
 138 /*! \fn int sha1_hmac_setkey_hw(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 139  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 140  *  \brief sets sha1 hmac key  into hw registers
 141  *  \param tfm linux crypto algo transform
 142  *  \param key input key
 143  *  \param keylen key length greater than 64 bytes IS NOT SUPPORTED
 144 */
 145 static int sha1_hmac_setkey_hw(const u8 *key, unsigned int keylen)
 146 {
 147     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 148     int i, j;
 149     u32 *in_key = (u32 *)key;
 150
 151     j = 0;
 152
 153     hash->KIDX |= 0x80000000; //reset keys back to 0
 154     for (i = 0; i < keylen; i+=4)
 155     {
 156          hash->KIDX = j;
 157          asm("sync");
 158          hash->KEY = *((u32 *) in_key + j);
 159          j++;
 160     }
 161
 162     return 0;
 163 }
 164
 165 /*! \fn void sha1_hmac_init(struct crypto_tfm *tfm)
 166  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 167  *  \brief initialize sha1 hmac context
 168  *  \param tfm linux crypto algo transform
 169 */
 170 static int sha1_hmac_init(struct shash_desc *desc)
 171 {
 172     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 173
 174     //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
 175     sctx->dbn = 0; //dbn workaround
 176
 177     return 0;
 178 }
 179
 180 /*! \fn static void sha1_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 181  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 182  *  \brief on-the-fly sha1 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 sha1_hmac_update(struct shash_desc *desc, const u8 *data,
 188             unsigned int len)
 189 {
 190     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 191     unsigned int i, j;
 192
 193     j = (sctx->count >> 3) & 0x3f;
 194     sctx->count += len << 3;
 195    // printk("sctx->count = %d\n", sctx->count);
 196
 197     if ((j + len) > 63) {
 198         memcpy (&sctx->buffer[j], data, (i = 64 - j));
 199         sha1_hmac_transform (desc, (const u32 *)sctx->buffer);
 200         for (; i + 63 < len; i += 64) {
 201             sha1_hmac_transform (desc, (const u32 *)&data[i]);
 202         }
 203
 204         j = 0;
 205     }
 206     else
 207         i = 0;
 208
 209     memcpy (&sctx->buffer[j], &data[i], len - i);
 210     return 0;
 211 }
 212
 213 /*! \fn static void sha1_hmac_final(struct crypto_tfm *tfm, u8 *out)
 214  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 215  *  \brief ompute final sha1 hmac value
 216  *  \param tfm linux crypto algo transform
 217  *  \param out final sha1 hmac output value
 218 */
 219 static int sha1_hmac_final(struct shash_desc *desc, u8 *out)
 220 {
 221     //struct sha1_hmac_ctx *sctx = shash_desc_ctx(desc);
 222     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 223     u32 index, padlen;
 224     u64 t;
 225     u8 bits[8] = { 0, };
 226     static const u8 padding[64] = { 0x80, };
 227     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 228     unsigned long flag;
 229     int i = 0;
 230     int dbn;
 231     u32 *in = &temp[0];
 232
 233     t = sctx->count + 512; // need to add 512 bit of the IPAD operation
 234     bits[7] = 0xff & t;
 235     t >>= 8;
 236     bits[6] = 0xff & t;
 237     t >>= 8;
 238     bits[5] = 0xff & t;
 239     t >>= 8;
 240     bits[4] = 0xff & t;
 241     t >>= 8;
 242     bits[3] = 0xff & t;
 243     t >>= 8;
 244     bits[2] = 0xff & t;
 245     t >>= 8;
 246     bits[1] = 0xff & t;
 247     t >>= 8;
 248     bits[0] = 0xff & t;
 249
 250     /* Pad out to 56 mod 64 */
 251     index = (sctx->count >> 3) & 0x3f;
 252     padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
 253     sha1_hmac_update (desc, padding, padlen);
 254
 255     /* Append length */
 256     sha1_hmac_update (desc, bits, sizeof bits);
 257
 258     CRTCL_SECT_HASH_START;
 259
 260     SHA_HASH_INIT;
 261
 262     sha1_hmac_setkey_hw(sctx->key, sctx->keylen);
 263
 264     hashs->DBN = sctx->dbn;
 265
 266     //for vr9 change, ENDI = 1
 267     *IFX_HASH_CON = HASH_CON_VALUE;
 268
 269     //wait for processing
 270     while (hashs->controlr.BSY) {
 271         // this will not take long
 272     }
 273
 274     for (dbn = 0; dbn < sctx->dbn; dbn++)
 275     {
 276     for (i = 0; i < 16; i++) {
 277         hashs->MR = in[i];
 278     };
 279
 280     hashs->controlr.GO = 1;
 281     asm("sync");
 282
 283     //wait for processing
 284     while (hashs->controlr.BSY) {
 285             // this will not take long
 286     }
 287
 288     in += 16;
 289 }
 290
 291
 292 #if 1
 293     //wait for digest ready
 294     while (! hashs->controlr.DGRY) {
 295         // this will not take long
 296     }
 297 #endif
 298
 299     *((u32 *) out + 0) = hashs->D1R;
 300     *((u32 *) out + 1) = hashs->D2R;
 301     *((u32 *) out + 2) = hashs->D3R;
 302     *((u32 *) out + 3) = hashs->D4R;
 303     *((u32 *) out + 4) = hashs->D5R;
 304
 305     memset(&sctx->buffer[0], 0, SHA1_HMAC_BLOCK_SIZE);
 306     sctx->count = 0;
 307
 308     //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
 309     CRTCL_SECT_HASH_END;
 310
 311
 312     return 0;
 313
 314 }
 315
 316 /*
 317  * \brief SHA1-HMAC function mappings
 318 */
 319 static struct shash_alg ifxdeu_sha1_hmac_alg = {
 320         .digestsize     =       SHA1_DIGEST_SIZE,
 321         .init           =       sha1_hmac_init,
 322         .update         =       sha1_hmac_update,
 323         .final          =       sha1_hmac_final,
 324         .setkey         =       sha1_hmac_setkey,
 325         .descsize       =       sizeof(struct sha1_hmac_ctx),
 326         .base           =       {
 327                 .cra_name       =       "hmac(sha1)",
 328                 .cra_driver_name=       "ifxdeu-sha1_hmac",
 329                 .cra_priority   =       400,
 330                 .cra_ctxsize    =       sizeof(struct sha1_hmac_ctx),
 331                 .cra_flags      =       CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
 332                 .cra_blocksize  =       SHA1_HMAC_BLOCK_SIZE,
 333                 .cra_module     =       THIS_MODULE,
 334         }
 335
 336 };
 337
 338
 339 /*! \fn int ifxdeu_init_sha1_hmac (void)
 340  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 341  *  \brief initialize sha1 hmac driver
 342 */
 343 int ifxdeu_init_sha1_hmac (void)
 344 {
 345     int ret = -ENOSYS;
 346
 347
 348
 349     if ((ret = crypto_register_shash(&ifxdeu_sha1_hmac_alg)))
 350         goto sha1_err;
 351
 352     printk (KERN_NOTICE "IFX DEU SHA1_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
 353     return ret;
 354
 355 sha1_err:
 356     printk(KERN_ERR "IFX DEU SHA1_HMAC initialization failed!\n");
 357     return ret;
 358 }
 359
 360 /*! \fn void ifxdeu_fini_sha1_hmac (void)
 361  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 362  *  \brief unregister sha1 hmac driver
 363 */
 364 void ifxdeu_fini_sha1_hmac (void)
 365 {
 366
 367     crypto_unregister_shash(&ifxdeu_sha1_hmac_alg);
 368
 369
 370 }
 371