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     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 123
 124     if (keylen > SHA1_HMAC_MAX_KEYLEN) {
 125         printk("Key length exceeds maximum key length\n");
 126         return -EINVAL;
 127     }
 128
 129     //printk("Setting keys of len: %d\n", keylen);
 130
 131     hashs->KIDX |= 0x80000000; //reset keys back to 0
 132     memcpy(&sctx->key, key, keylen);
 133     sctx->keylen = keylen;
 134
 135     return 0;
 136
 137 }
 138
 139
 140 /*! \fn int sha1_hmac_setkey_hw(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 141  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 142  *  \brief sets sha1 hmac key  into hw registers
 143  *  \param tfm linux crypto algo transform
 144  *  \param key input key
 145  *  \param keylen key length greater than 64 bytes IS NOT SUPPORTED
 146 */
 147 static int sha1_hmac_setkey_hw(const u8 *key, unsigned int keylen)
 148 {
 149     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 150     int i, j;
 151     unsigned long flag;
 152     u32 *in_key = (u32 *)key;
 153
 154     j = 0;
 155
 156     CRTCL_SECT_HASH_START;
 157     for (i = 0; i < keylen; i+=4)
 158     {
 159          hash->KIDX = j;
 160          asm("sync");
 161          hash->KEY = *((u32 *) in_key + j);
 162          j++;
 163     }
 164
 165     CRTCL_SECT_HASH_END;
 166     return 0;
 167 }
 168
 169 /*! \fn void sha1_hmac_init(struct crypto_tfm *tfm)
 170  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 171  *  \brief initialize sha1 hmac context
 172  *  \param tfm linux crypto algo transform
 173 */
 174 static int sha1_hmac_init(struct shash_desc *desc)
 175 {
 176     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 177
 178     //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
 179     sctx->dbn = 0; //dbn workaround
 180     sha1_hmac_setkey_hw(sctx->key, sctx->keylen);
 181
 182     return 0;
 183 }
 184
 185 /*! \fn static void sha1_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 186  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 187  *  \brief on-the-fly sha1 hmac computation
 188  *  \param tfm linux crypto algo transform
 189  *  \param data input data
 190  *  \param len size of input data
 191 */
 192 static int sha1_hmac_update(struct shash_desc *desc, const u8 *data,
 193             unsigned int len)
 194 {
 195     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 196     unsigned int i, j;
 197
 198     j = (sctx->count >> 3) & 0x3f;
 199     sctx->count += len << 3;
 200    // printk("sctx->count = %d\n", sctx->count);
 201
 202     if ((j + len) > 63) {
 203         memcpy (&sctx->buffer[j], data, (i = 64 - j));
 204         sha1_hmac_transform (desc, (const u32 *)sctx->buffer);
 205         for (; i + 63 < len; i += 64) {
 206             sha1_hmac_transform (desc, (const u32 *)&data[i]);
 207         }
 208
 209         j = 0;
 210     }
 211     else
 212         i = 0;
 213
 214     memcpy (&sctx->buffer[j], &data[i], len - i);
 215     return 0;
 216 }
 217
 218 /*! \fn static void sha1_hmac_final(struct crypto_tfm *tfm, u8 *out)
 219  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 220  *  \brief ompute final sha1 hmac value
 221  *  \param tfm linux crypto algo transform
 222  *  \param out final sha1 hmac output value
 223 */
 224 static int sha1_hmac_final(struct shash_desc *desc, u8 *out)
 225 {
 226     //struct sha1_hmac_ctx *sctx = shash_desc_ctx(desc);
 227     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 228     u32 index, padlen;
 229     u64 t;
 230     u8 bits[8] = { 0, };
 231     static const u8 padding[64] = { 0x80, };
 232     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 233     unsigned long flag;
 234     int i = 0;
 235     int dbn;
 236     u32 *in = &temp[0];
 237
 238     t = sctx->count + 512; // need to add 512 bit of the IPAD operation
 239     bits[7] = 0xff & t;
 240     t >>= 8;
 241     bits[6] = 0xff & t;
 242     t >>= 8;
 243     bits[5] = 0xff & t;
 244     t >>= 8;
 245     bits[4] = 0xff & t;
 246     t >>= 8;
 247     bits[3] = 0xff & t;
 248     t >>= 8;
 249     bits[2] = 0xff & t;
 250     t >>= 8;
 251     bits[1] = 0xff & t;
 252     t >>= 8;
 253     bits[0] = 0xff & t;
 254
 255     /* Pad out to 56 mod 64 */
 256     index = (sctx->count >> 3) & 0x3f;
 257     padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
 258     sha1_hmac_update (desc, padding, padlen);
 259
 260     /* Append length */
 261     sha1_hmac_update (desc, bits, sizeof bits);
 262
 263     CRTCL_SECT_HASH_START;
 264
 265     hashs->DBN = sctx->dbn;
 266
 267     //for vr9 change, ENDI = 1
 268     *IFX_HASH_CON = HASH_CON_VALUE;
 269
 270     //wait for processing
 271     while (hashs->controlr.BSY) {
 272         // this will not take long
 273     }
 274
 275     for (dbn = 0; dbn < sctx->dbn; dbn++)
 276     {
 277     for (i = 0; i < 16; i++) {
 278         hashs->MR = in[i];
 279     };
 280
 281     hashs->controlr.GO = 1;
 282     asm("sync");
 283
 284     //wait for processing
 285     while (hashs->controlr.BSY) {
 286             // this will not take long
 287     }
 288
 289     in += 16;
 290 }
 291
 292
 293 #if 1
 294     //wait for digest ready
 295     while (! hashs->controlr.DGRY) {
 296         // this will not take long
 297     }
 298 #endif
 299
 300     *((u32 *) out + 0) = hashs->D1R;
 301     *((u32 *) out + 1) = hashs->D2R;
 302     *((u32 *) out + 2) = hashs->D3R;
 303     *((u32 *) out + 3) = hashs->D4R;
 304     *((u32 *) out + 4) = hashs->D5R;
 305
 306     memset(&sctx->buffer[0], 0, SHA1_HMAC_BLOCK_SIZE);
 307     sctx->count = 0;
 308
 309     //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
 310     CRTCL_SECT_HASH_END;
 311
 312
 313     return 0;
 314
 315 }
 316
 317 /*
 318  * \brief SHA1-HMAC function mappings
 319 */
 320 static struct shash_alg ifxdeu_sha1_hmac_alg = {
 321         .digestsize     =       SHA1_DIGEST_SIZE,
 322         .init           =       sha1_hmac_init,
 323         .update         =       sha1_hmac_update,
 324         .final          =       sha1_hmac_final,
 325         .setkey         =       sha1_hmac_setkey,
 326         .descsize       =       sizeof(struct sha1_hmac_ctx),
 327         .base           =       {
 328                 .cra_name       =       "hmac(sha1)",
 329                 .cra_driver_name=       "ifxdeu-sha1_hmac",
 330                 .cra_priority   =       400,
 331                 .cra_ctxsize    =       sizeof(struct sha1_hmac_ctx),
 332                 .cra_flags      =       CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
 333                 .cra_blocksize  =       SHA1_HMAC_BLOCK_SIZE,
 334                 .cra_module     =       THIS_MODULE,
 335         }
 336
 337 };
 338
 339
 340 /*! \fn int ifxdeu_init_sha1_hmac (void)
 341  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 342  *  \brief initialize sha1 hmac driver
 343 */
 344 int ifxdeu_init_sha1_hmac (void)
 345 {
 346     int ret = -ENOSYS;
 347
 348
 349
 350     if ((ret = crypto_register_shash(&ifxdeu_sha1_hmac_alg)))
 351         goto sha1_err;
 352
 353     printk (KERN_NOTICE "IFX DEU SHA1_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
 354     return ret;
 355
 356 sha1_err:
 357     printk(KERN_ERR "IFX DEU SHA1_HMAC initialization failed!\n");
 358     return ret;
 359 }
 360
 361 /*! \fn void ifxdeu_fini_sha1_hmac (void)
 362  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 363  *  \brief unregister sha1 hmac driver
 364 */
 365 void ifxdeu_fini_sha1_hmac (void)
 366 {
 367
 368     crypto_unregister_shash(&ifxdeu_sha1_hmac_alg);
 369
 370
 371 }
 372