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 <linux/cryptohash.h>
  48 #include <crypto/internal/hash.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 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)
  73
  74 #ifdef CRYPTO_DEBUG
  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);
  77 #else
  78 #define DPRINTF(level, format, args...)
  79 #endif
  80
  81 struct sha1_hmac_ctx {
  82     int keylen;
  83
  84     u8 buffer[SHA1_HMAC_BLOCK_SIZE];
  85     u8 key[SHA1_HMAC_MAX_KEYLEN];
  86     u32 state[5];
  87     u32 dbn;
  88     u64 count;
  89
  90 };
  91
  92 static u32 temp[SHA1_HMAC_DBN_TEMP_SIZE];
  93
  94 extern int disable_deudma;
  95
  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
 101 */
 102 static int sha1_hmac_transform(struct shash_desc *desc, u32 const *in)
 103 {
 104     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 105
 106     memcpy(&temp[sctx->dbn<<4], in, 64); //dbn workaround
 107     sctx->dbn += 1;
 108
 109     if ( (sctx->dbn<<4) > SHA1_HMAC_DBN_TEMP_SIZE )
 110     {
 111         printk("SHA1_HMAC_DBN_TEMP_SIZE exceeded\n");
 112     }
 113
 114     return 0;
 115 }
 116
 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
 123 */
 124 static int sha1_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
 125 {
 126     struct sha1_hmac_ctx *sctx = crypto_shash_ctx(tfm);
 127     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 128
 129     if (keylen > SHA1_HMAC_MAX_KEYLEN) {
 130         printk("Key length exceeds maximum key length\n");
 131         return -EINVAL;
 132     }
 133
 134     //printk("Setting keys of len: %d\n", keylen);
 135
 136     hashs->KIDX |= 0x80000000; //reset keys back to 0
 137     memcpy(&sctx->key, key, keylen);
 138     sctx->keylen = keylen;
 139
 140     return 0;
 141
 142 }
 143
 144
 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
 151 */
 152 static int sha1_hmac_setkey_hw(const u8 *key, unsigned int keylen)
 153 {
 154     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 155     int i, j;
 156     unsigned long flag;
 157     u32 *in_key = (u32 *)key;
 158
 159     j = 0;
 160
 161     CRTCL_SECT_START;
 162     for (i = 0; i < keylen; i+=4)
 163     {
 164          hash->KIDX = j;
 165          asm("sync");
 166          hash->KEY = *((u32 *) in_key + j);
 167          j++;
 168     }
 169
 170     CRTCL_SECT_END;
 171     return 0;
 172 }
 173
 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
 178 */
 179 static int sha1_hmac_init(struct shash_desc *desc)
 180 {
 181     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 182
 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);
 186
 187     return 0;
 188 }
 189
 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
 196 */
 197 static int sha1_hmac_update(struct shash_desc *desc, const u8 *data,
 198             unsigned int len)
 199 {
 200     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 201     unsigned int i, j;
 202
 203     j = (sctx->count >> 3) & 0x3f;
 204     sctx->count += len << 3;
 205    // printk("sctx->count = %d\n", sctx->count);
 206
 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]);
 212         }
 213
 214         j = 0;
 215     }
 216     else
 217         i = 0;
 218
 219     memcpy (&sctx->buffer[j], &data[i], len - i);
 220     return 0;
 221 }
 222
 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
 228 */
 229 static int sha1_hmac_final(struct shash_desc *desc, u8 *out)
 230 {
 231     //struct sha1_hmac_ctx *sctx = shash_desc_ctx(desc);
 232     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 233     u32 index, padlen;
 234     u64 t;
 235     u8 bits[8] = { 0, };
 236     static const u8 padding[64] = { 0x80, };
 237     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 238     unsigned long flag;
 239     int i = 0;
 240     int dbn;
 241     u32 *in = &temp[0];
 242
 243     t = sctx->count + 512; // need to add 512 bit of the IPAD operation
 244     bits[7] = 0xff & t;
 245     t >>= 8;
 246     bits[6] = 0xff & t;
 247     t >>= 8;
 248     bits[5] = 0xff & t;
 249     t >>= 8;
 250     bits[4] = 0xff & t;
 251     t >>= 8;
 252     bits[3] = 0xff & t;
 253     t >>= 8;
 254     bits[2] = 0xff & t;
 255     t >>= 8;
 256     bits[1] = 0xff & t;
 257     t >>= 8;
 258     bits[0] = 0xff & t;
 259
 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);
 264
 265     /* Append length */
 266     sha1_hmac_update (desc, bits, sizeof bits);
 267
 268     CRTCL_SECT_START;
 269
 270     hashs->DBN = sctx->dbn;
 271
 272     //for vr9 change, ENDI = 1
 273     *IFX_HASH_CON = HASH_CON_VALUE;
 274
 275     //wait for processing
 276     while (hashs->controlr.BSY) {
 277         // this will not take long
 278     }
 279
 280     for (dbn = 0; dbn < sctx->dbn; dbn++)
 281     {
 282     for (i = 0; i < 16; i++) {
 283         hashs->MR = in[i];
 284     };
 285
 286     hashs->controlr.GO = 1;
 287     asm("sync");
 288
 289     //wait for processing
 290     while (hashs->controlr.BSY) {
 291             // this will not take long
 292     }
 293
 294     in += 16;
 295 }
 296
 297
 298 #if 1
 299     //wait for digest ready
 300     while (! hashs->controlr.DGRY) {
 301         // this will not take long
 302     }
 303 #endif
 304
 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;
 310
 311     memset(&sctx->buffer[0], 0, SHA1_HMAC_BLOCK_SIZE);
 312     sctx->count = 0;
 313
 314     //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
 315     CRTCL_SECT_END;
 316
 317
 318     return 0;
 319
 320 }
 321
 322 /*
 323  * \brief SHA1-HMAC function mappings
 324 */
 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),
 332         .base           =       {
 333                 .cra_name       =       "hmac(sha1)",
 334                 .cra_driver_name=       "ifxdeu-sha1_hmac",
 335                 .cra_priority   =       400,
 336                 .cra_ctxsize    =       sizeof(struct sha1_hmac_ctx),
 337                 .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
 338                 .cra_blocksize  =       SHA1_HMAC_BLOCK_SIZE,
 339                 .cra_module     =       THIS_MODULE,
 340         }
 341
 342 };
 343
 344
 345 /*! \fn int ifxdeu_init_sha1_hmac (void)
 346  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 347  *  \brief initialize sha1 hmac driver
 348 */
 349 int ifxdeu_init_sha1_hmac (void)
 350 {
 351     int ret = -ENOSYS;
 352
 353
 354
 355     if ((ret = crypto_register_shash(&ifxdeu_sha1_hmac_alg)))
 356         goto sha1_err;
 357
 358     CRTCL_SECT_INIT;
 359
 360     printk (KERN_NOTICE "IFX DEU SHA1_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
 361     return ret;
 362
 363 sha1_err:
 364     printk(KERN_ERR "IFX DEU SHA1_HMAC initialization failed!\n");
 365     return ret;
 366 }
 367
 368 /*! \fn void ifxdeu_fini_sha1_hmac (void)
 369  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 370  *  \brief unregister sha1 hmac driver
 371 */
 372 void ifxdeu_fini_sha1_hmac (void)
 373 {
 374
 375     crypto_unregister_shash(&ifxdeu_sha1_hmac_alg);
 376
 377
 378 }
 379