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 /* Project header */
  42 #include <linux/init.h>
  43 #include <linux/module.h>
  44 #include <linux/mm.h>
  45 #include <linux/crypto.h>
  46 #include <crypto/internal/hash.h>
  47 #include <crypto/sha.h>
  48 #include <linux/types.h>
  49 #include <linux/scatterlist.h>
  50 #include <asm/byteorder.h>
  51 #include <linux/delay.h>
  52
  53 #if defined(CONFIG_AR9)
  54 #include "ifxmips_deu_ar9.h"
  55 #elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
  56 #include "ifxmips_deu_vr9.h"
  57 #else
  58 #error "Plaform Unknwon!"
  59 #endif
  60
  61 #define SHA1_DIGEST_SIZE    20
  62 #define SHA1_BLOCK_WORDS    16
  63 #define SHA1_HASH_WORDS     5
  64 #define SHA1_HMAC_BLOCK_SIZE    64
  65 #define SHA1_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround
  66 #define HASH_START   IFX_HASH_CON
  67
  68 #define SHA1_HMAC_MAX_KEYLEN 64
  69
  70 #ifdef CRYPTO_DEBUG
  71 extern char debug_level;
  72 #define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
  73 #else
  74 #define DPRINTF(level, format, args...)
  75 #endif
  76
  77 struct sha1_hmac_ctx {
  78     int keylen;
  79
  80     u8 buffer[SHA1_HMAC_BLOCK_SIZE];
  81     u8 key[SHA1_HMAC_MAX_KEYLEN];
  82     u32 hash[SHA1_HASH_WORDS];
  83     u32 dbn;
  84     int started;
  85     u64 count;
  86
  87     struct shash_desc *desc;
  88     u32 (*temp)[SHA1_BLOCK_WORDS];
  89 };
  90
  91 extern int disable_deudma;
  92
  93 static int sha1_hmac_final_impl(struct shash_desc *desc, u8 *out, bool hash_final);
  94
  95 /*! \fn static void sha1_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
  96  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
  97  *  \brief save input block to context
  98  *  \param tfm linux crypto algo transform
  99  *  \param in 64-byte block of input
 100 */
 101 static int sha1_hmac_transform(struct shash_desc *desc, u32 const *in)
 102 {
 103     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 104
 105     if ( ((sctx->dbn<<4)+1) > SHA1_HMAC_DBN_TEMP_SIZE )
 106     {
 107         //printk("SHA1_HMAC_DBN_TEMP_SIZE exceeded\n");
 108         sha1_hmac_final_impl(desc, (u8 *)sctx->hash, false);
 109     }
 110
 111     memcpy(&sctx->temp[sctx->dbn], in, 64); //dbn workaround
 112     sctx->dbn += 1;
 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     int err;
 128
 129     if (keylen > SHA1_HMAC_MAX_KEYLEN) {
 130         char *hash_alg_name = "sha1";
 131
 132         sctx->desc->tfm = crypto_alloc_shash(hash_alg_name, 0, 0);
 133         if (IS_ERR(sctx->desc->tfm)) return PTR_ERR(sctx->desc->tfm);
 134
 135         memset(sctx->key, 0, SHA1_HMAC_MAX_KEYLEN);
 136         err = crypto_shash_digest(sctx->desc, key, keylen, sctx->key);
 137         if (err) return err;
 138
 139         sctx->keylen = SHA1_DIGEST_SIZE;
 140
 141         crypto_free_shash(sctx->desc->tfm);
 142     } else {
 143         memcpy(sctx->key, key, keylen);
 144         sctx->keylen = keylen;
 145     }
 146     memset(sctx->key + sctx->keylen, 0, SHA1_HMAC_MAX_KEYLEN - sctx->keylen);
 147
 148     //printk("Setting keys of len: %d\n", keylen);
 149
 150     return 0;
 151 }
 152
 153 /*! \fn int sha1_hmac_setkey_hw(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 154  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 155  *  \brief sets sha1 hmac key  into hw registers
 156  *  \param tfm linux crypto algo transform
 157  *  \param key input key
 158  *  \param keylen key length greater than 64 bytes IS NOT SUPPORTED
 159 */
 160 static int sha1_hmac_setkey_hw(const u8 *key, unsigned int keylen)
 161 {
 162     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 163     int i, j;
 164     u32 *in_key = (u32 *)key;
 165
 166     j = 0;
 167
 168     hash->KIDX |= 0x80000000; //reset keys back to 0
 169     for (i = 0; i < keylen; i+=4)
 170     {
 171          hash->KIDX = j;
 172          asm("sync");
 173          hash->KEY = *((u32 *) in_key + j);
 174          j++;
 175     }
 176
 177     return 0;
 178 }
 179
 180 /*! \fn void sha1_hmac_init(struct crypto_tfm *tfm)
 181  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 182  *  \brief initialize sha1 hmac context
 183  *  \param tfm linux crypto algo transform
 184 */
 185 static int sha1_hmac_init(struct shash_desc *desc)
 186 {
 187     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 188
 189     //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
 190     sctx->dbn = 0; //dbn workaround
 191     sctx->started = 0;
 192     sctx->count = 0;
 193
 194     return 0;
 195 }
 196
 197 /*! \fn static void sha1_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 198  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 199  *  \brief on-the-fly sha1 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 sha1_hmac_update(struct shash_desc *desc, const u8 *data,
 205             unsigned int len)
 206 {
 207     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 208     unsigned int i, j;
 209
 210     j = (sctx->count >> 3) & 0x3f;
 211     sctx->count += len << 3;
 212    // printk("sctx->count = %d\n", sctx->count);
 213
 214     if ((j + len) > 63) {
 215         memcpy (&sctx->buffer[j], data, (i = 64 - j));
 216         sha1_hmac_transform (desc, (const u32 *)sctx->buffer);
 217         for (; i + 63 < len; i += 64) {
 218             sha1_hmac_transform (desc, (const u32 *)&data[i]);
 219         }
 220
 221         j = 0;
 222     }
 223     else
 224         i = 0;
 225
 226     memcpy (&sctx->buffer[j], &data[i], len - i);
 227     return 0;
 228 }
 229
 230 /*! \fn static int sha1_hmac_final(struct crypto_tfm *tfm, u8 *out)
 231  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 232  *  \brief call sha1_hmac_final_impl with hash_final true
 233  *  \param tfm linux crypto algo transform
 234  *  \param out final sha1 hmac output value
 235 */
 236 static int sha1_hmac_final(struct shash_desc *desc, u8 *out)
 237 {
 238     return sha1_hmac_final_impl(desc, out, true);
 239 }
 240
 241 /*! \fn static int sha1_hmac_final_impl(struct crypto_tfm *tfm, u8 *out, bool hash_final)
 242  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 243  *  \brief ompute final or intermediate sha1 hmac value
 244  *  \param tfm linux crypto algo transform
 245  *  \param out final sha1 hmac output value
 246  *  \param in finalize or intermediate processing
 247 */
 248 static int sha1_hmac_final_impl(struct shash_desc *desc, u8 *out, bool hash_final)
 249 {
 250     struct sha1_hmac_ctx *sctx =  crypto_shash_ctx(desc->tfm);
 251     u32 index, padlen;
 252     u64 t;
 253     u8 bits[8] = { 0, };
 254     static const u8 padding[64] = { 0x80, };
 255     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 256     unsigned long flag;
 257     int i = 0;
 258     int dbn;
 259     u32 *in = sctx->temp[0];
 260
 261     if (hash_final) {
 262         t = sctx->count + 512; // need to add 512 bit of the IPAD operation
 263         bits[7] = 0xff & t;
 264         t >>= 8;
 265         bits[6] = 0xff & t;
 266         t >>= 8;
 267         bits[5] = 0xff & t;
 268         t >>= 8;
 269         bits[4] = 0xff & t;
 270         t >>= 8;
 271         bits[3] = 0xff & t;
 272         t >>= 8;
 273         bits[2] = 0xff & t;
 274         t >>= 8;
 275         bits[1] = 0xff & t;
 276         t >>= 8;
 277         bits[0] = 0xff & t;
 278
 279         /* Pad out to 56 mod 64 */
 280         index = (sctx->count >> 3) & 0x3f;
 281         padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
 282         sha1_hmac_update (desc, padding, padlen);
 283
 284         /* Append length */
 285         sha1_hmac_update (desc, bits, sizeof bits);
 286     }
 287
 288     CRTCL_SECT_HASH_START;
 289
 290     SHA_HASH_INIT;
 291
 292     sha1_hmac_setkey_hw(sctx->key, sctx->keylen);
 293
 294     if (hash_final) {
 295         hashs->DBN = sctx->dbn;
 296     } else {
 297         hashs->DBN = sctx->dbn + 5;
 298     }
 299     asm("sync");
 300
 301     //for vr9 change, ENDI = 1
 302     *IFX_HASH_CON = HASH_CON_VALUE;
 303
 304     //wait for processing
 305     while (hashs->controlr.BSY) {
 306         // this will not take long
 307     }
 308
 309     if (sctx->started) {
 310         hashs->D1R = *((u32 *) sctx->hash + 0);
 311         hashs->D2R = *((u32 *) sctx->hash + 1);
 312         hashs->D3R = *((u32 *) sctx->hash + 2);
 313         hashs->D4R = *((u32 *) sctx->hash + 3);
 314         hashs->D5R = *((u32 *) sctx->hash + 4);
 315     } else {
 316         sctx->started = 1;
 317     }
 318
 319     for (dbn = 0; dbn < sctx->dbn; dbn++)
 320     {
 321         for (i = 0; i < 16; i++) {
 322             hashs->MR = in[i];
 323         };
 324
 325         hashs->controlr.GO = 1;
 326         asm("sync");
 327
 328         //wait for processing
 329         while (hashs->controlr.BSY) {
 330             // this will not take long
 331         }
 332
 333         in += 16;
 334     }
 335
 336
 337 #if 1
 338     if (hash_final) {
 339         //wait for digest ready
 340         while (! hashs->controlr.DGRY) {
 341             // this will not take long
 342         }
 343     }
 344 #endif
 345
 346     *((u32 *) out + 0) = hashs->D1R;
 347     *((u32 *) out + 1) = hashs->D2R;
 348     *((u32 *) out + 2) = hashs->D3R;
 349     *((u32 *) out + 3) = hashs->D4R;
 350     *((u32 *) out + 4) = hashs->D5R;
 351
 352     CRTCL_SECT_HASH_END;
 353
 354     if (hash_final) {
 355         sha1_hmac_init(desc);
 356     } else {
 357         sctx->dbn = 0;
 358     }
 359     //printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
 360
 361     return 0;
 362
 363 }
 364
 365 /*! \fn void sha1_hmac_init_tfm(struct crypto_tfm *tfm)
 366  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 367  *  \brief initialize pointers in sha1_hmac_ctx
 368  *  \param tfm linux crypto algo transform
 369 */
 370 static int sha1_hmac_init_tfm(struct crypto_tfm *tfm)
 371 {
 372     struct sha1_hmac_ctx *sctx = crypto_tfm_ctx(tfm);
 373     sctx->temp = kzalloc(4 * SHA1_HMAC_DBN_TEMP_SIZE, GFP_KERNEL);
 374     if (IS_ERR(sctx->temp)) return PTR_ERR(sctx->temp);
 375     sctx->desc = kzalloc(sizeof(struct shash_desc), GFP_KERNEL);
 376     if (IS_ERR(sctx->desc)) return PTR_ERR(sctx->desc);
 377
 378     return 0;
 379 }
 380
 381 /*! \fn void sha1_hmac_exit_tfm(struct crypto_tfm *tfm)
 382  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 383  *  \brief free pointers in sha1_hmac_ctx
 384  *  \param tfm linux crypto algo transform
 385 */
 386 static void sha1_hmac_exit_tfm(struct crypto_tfm *tfm)
 387 {
 388     struct sha1_hmac_ctx *sctx = crypto_tfm_ctx(tfm);
 389     kfree(sctx->temp);
 390     kfree(sctx->desc);
 391 }
 392
 393 /*
 394  * \brief SHA1_HMAC function mappings
 395 */
 396
 397 static struct shash_alg ifxdeu_sha1_hmac_alg = {
 398     .digestsize         =       SHA1_DIGEST_SIZE,
 399     .init               =       sha1_hmac_init,
 400     .update             =       sha1_hmac_update,
 401     .final              =       sha1_hmac_final,
 402     .setkey             =       sha1_hmac_setkey,
 403     .descsize           =       sizeof(struct sha1_hmac_ctx),
 404     .base               =       {
 405         .cra_name       =       "hmac(sha1)",
 406         .cra_driver_name=       "ifxdeu-sha1_hmac",
 407         .cra_priority   =       400,
 408         .cra_ctxsize    =       sizeof(struct sha1_hmac_ctx),
 409         .cra_flags      =       CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
 410         .cra_blocksize  =       SHA1_HMAC_BLOCK_SIZE,
 411         .cra_module     =       THIS_MODULE,
 412         .cra_init       =       sha1_hmac_init_tfm,
 413         .cra_exit       =       sha1_hmac_exit_tfm,
 414         }
 415 };
 416
 417 /*! \fn int ifxdeu_init_sha1_hmac (void)
 418  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 419  *  \brief initialize sha1 hmac driver
 420 */
 421 int ifxdeu_init_sha1_hmac (void)
 422 {
 423     int ret = -ENOSYS;
 424
 425
 426
 427     if ((ret = crypto_register_shash(&ifxdeu_sha1_hmac_alg)))
 428         goto sha1_err;
 429
 430     printk (KERN_NOTICE "IFX DEU SHA1_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
 431     return ret;
 432
 433 sha1_err:
 434     printk(KERN_ERR "IFX DEU SHA1_HMAC initialization failed!\n");
 435     return ret;
 436 }
 437
 438 /*! \fn void ifxdeu_fini_sha1_hmac (void)
 439  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 440  *  \brief unregister sha1 hmac driver
 441 */
 442 void ifxdeu_fini_sha1_hmac (void)
 443 {
 444
 445     crypto_unregister_shash(&ifxdeu_sha1_hmac_alg);
 446
 447
 448 }