package/kernel/lantiq/ltq-deu/src/ifxmips_md5.c

   1 /******************************************************************************
   2 **
   3 ** FILE NAME    : ifxmips_md5.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 *******************************************************************************/
  23 /*!
  24   \defgroup    IFX_DEU IFX_DEU_DRIVERS
  25   \ingroup API
  26   \brief ifx deu driver module
  27 */
  28
  29 /*!
  30   \file         ifxmips_md5.c
  31   \ingroup      IFX_DEU
  32   \brief        MD5 encryption deu driver file
  33 */
  34
  35 /*!
  36   \defgroup IFX_MD5_FUNCTIONS IFX_MD5_FUNCTIONS
  37   \ingroup IFX_DEU
  38   \brief ifx deu MD5 functions
  39 */
  40
  41 /*Project header files */
  42 #include <linux/init.h>
  43 #include <linux/module.h>
  44 #include <linux/string.h>
  45 #include <linux/crypto.h>
  46 #include <linux/types.h>
  47 #include <crypto/internal/hash.h>
  48 #include <asm/byteorder.h>
  49
  50 /* Project header */
  51 #if defined(CONFIG_DANUBE)
  52 #include "ifxmips_deu_danube.h"
  53 #elif 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 MD5_DIGEST_SIZE     16
  62 #define MD5_HMAC_BLOCK_SIZE 64
  63 #define MD5_BLOCK_WORDS     16
  64 #define MD5_HASH_WORDS      4
  65 #define HASH_START   IFX_HASH_CON
  66
  67 //#define CRYPTO_DEBUG
  68 #ifdef CRYPTO_DEBUG
  69 extern char debug_level;
  70 #define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
  71 #else
  72 #define DPRINTF(level, format, args...)
  73 #endif
  74
  75 struct md5_ctx {
  76     int started;
  77     u32 hash[MD5_HASH_WORDS];
  78     u32 block[MD5_BLOCK_WORDS];
  79     u64 byte_count;
  80 };
  81
  82 extern int disable_deudma;
  83
  84 /*! \fn static u32 endian_swap(u32 input)
  85  *  \ingroup IFX_MD5_FUNCTIONS
  86  *  \brief perform dword level endian swap
  87  *  \param input value of dword that requires to be swapped
  88 */
  89 static u32 endian_swap(u32 input)
  90 {
  91     u8 *ptr = (u8 *)&input;
  92
  93     return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
  94 }
  95
  96 /*! \fn static void md5_transform(u32 *hash, u32 const *in)
  97  *  \ingroup IFX_MD5_FUNCTIONS
  98  *  \brief main interface to md5 hardware
  99  *  \param hash current hash value
 100  *  \param in 64-byte block of input
 101 */
 102 static void md5_transform(struct md5_ctx *mctx, u32 *hash, u32 const *in)
 103 {
 104     int i;
 105     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 106     unsigned long flag;
 107
 108     CRTCL_SECT_HASH_START;
 109
 110     if (mctx->started) {
 111         hashs->D1R = endian_swap(*((u32 *) hash + 0));
 112         hashs->D2R = endian_swap(*((u32 *) hash + 1));
 113         hashs->D3R = endian_swap(*((u32 *) hash + 2));
 114         hashs->D4R = endian_swap(*((u32 *) hash + 3));
 115     }
 116
 117     for (i = 0; i < 16; i++) {
 118         hashs->MR = endian_swap(in[i]);
 119 //      printk("in[%d]: %08x\n", i, endian_swap(in[i]));
 120     };
 121
 122     //wait for processing
 123     while (hashs->controlr.BSY) {
 124         // this will not take long
 125     }
 126
 127     *((u32 *) hash + 0) = endian_swap (hashs->D1R);
 128     *((u32 *) hash + 1) = endian_swap (hashs->D2R);
 129     *((u32 *) hash + 2) = endian_swap (hashs->D3R);
 130     *((u32 *) hash + 3) = endian_swap (hashs->D4R);
 131
 132     mctx->started = 1;
 133
 134     CRTCL_SECT_HASH_END;
 135 }
 136
 137 /*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx)
 138  *  \ingroup IFX_MD5_FUNCTIONS
 139  *  \brief interfacing function for md5_transform()
 140  *  \param ctx crypto context
 141 */
 142 static inline void md5_transform_helper(struct md5_ctx *ctx)
 143 {
 144     //le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
 145     md5_transform(ctx, ctx->hash, ctx->block);
 146 }
 147
 148 /*! \fn static void md5_init(struct crypto_tfm *tfm)
 149  *  \ingroup IFX_MD5_FUNCTIONS
 150  *  \brief initialize md5 hardware
 151  *  \param tfm linux crypto algo transform
 152 */
 153 static int md5_init(struct shash_desc *desc)
 154 {
 155     struct md5_ctx *mctx = shash_desc_ctx(desc);
 156     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 157
 158     hash->controlr.ENDI = 0;
 159     hash->controlr.SM = 1;
 160     hash->controlr.ALGO = 1;    // 1 = md5  0 = sha1
 161     hash->controlr.INIT = 1;    // Initialize the hash operation by writing a '1' to the INIT bit.
 162
 163     mctx->byte_count = 0;
 164     mctx->started = 0;
 165     return 0;
 166 }
 167
 168 /*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 169  *  \ingroup IFX_MD5_FUNCTIONS
 170  *  \brief on-the-fly md5 computation
 171  *  \param tfm linux crypto algo transform
 172  *  \param data input data
 173  *  \param len size of input data
 174 */
 175 static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 176 {
 177     struct md5_ctx *mctx = shash_desc_ctx(desc);
 178     const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 179
 180     mctx->byte_count += len;
 181
 182     if (avail > len) {
 183         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 184                data, len);
 185         return 0;
 186     }
 187
 188     memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 189            data, avail);
 190
 191     md5_transform_helper(mctx);
 192     data += avail;
 193     len -= avail;
 194
 195     while (len >= sizeof(mctx->block)) {
 196         memcpy(mctx->block, data, sizeof(mctx->block));
 197         md5_transform_helper(mctx);
 198         data += sizeof(mctx->block);
 199         len -= sizeof(mctx->block);
 200     }
 201
 202     memcpy(mctx->block, data, len);
 203     return 0;
 204 }
 205
 206 /*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out)
 207  *  \ingroup IFX_MD5_FUNCTIONS
 208  *  \brief compute final md5 value
 209  *  \param tfm linux crypto algo transform
 210  *  \param out final md5 output value
 211 */
 212 static int md5_final(struct shash_desc *desc, u8 *out)
 213 {
 214     struct md5_ctx *mctx = shash_desc_ctx(desc);
 215     const unsigned int offset = mctx->byte_count & 0x3f;
 216     char *p = (char *)mctx->block + offset;
 217     int padding = 56 - (offset + 1);
 218     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 219     unsigned long flag;
 220
 221     *p++ = 0x80;
 222     if (padding < 0) {
 223         memset(p, 0x00, padding + sizeof (u64));
 224         md5_transform_helper(mctx);
 225         p = (char *)mctx->block;
 226         padding = 56;
 227     }
 228
 229     memset(p, 0, padding);
 230     mctx->block[14] = endian_swap(mctx->byte_count << 3);
 231     mctx->block[15] = endian_swap(mctx->byte_count >> 29);
 232
 233 #if 0
 234     le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
 235                       sizeof(u64)) / sizeof(u32));
 236 #endif
 237
 238     md5_transform(mctx, mctx->hash, mctx->block);
 239
 240     CRTCL_SECT_HASH_START;
 241
 242     *((u32 *) out + 0) = endian_swap (hashs->D1R);
 243     *((u32 *) out + 1) = endian_swap (hashs->D2R);
 244     *((u32 *) out + 2) = endian_swap (hashs->D3R);
 245     *((u32 *) out + 3) = endian_swap (hashs->D4R);
 246
 247     CRTCL_SECT_HASH_END;
 248
 249     // Wipe context
 250     memset(mctx, 0, sizeof(*mctx));
 251
 252     return 0;
 253 }
 254
 255 /*
 256  * \brief MD5 function mappings
 257 */
 258 static struct shash_alg ifxdeu_md5_alg = {
 259     .digestsize         =       MD5_DIGEST_SIZE,
 260     .init               =       md5_init,
 261     .update             =       md5_update,
 262     .final              =       md5_final,
 263     .descsize           =       sizeof(struct md5_ctx),
 264     .base               =       {
 265                 .cra_name       =       "md5",
 266                 .cra_driver_name=       "ifxdeu-md5",
 267                 .cra_priority   =       300,
 268                 .cra_flags      =       CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
 269                 .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
 270                 .cra_module     =       THIS_MODULE,
 271     }
 272 };
 273
 274 /*! \fn int ifxdeu_init_md5 (void)
 275  *  \ingroup IFX_MD5_FUNCTIONS
 276  *  \brief initialize md5 driver
 277 */
 278 int ifxdeu_init_md5 (void)
 279 {
 280     int ret = -ENOSYS;
 281
 282
 283     if ((ret = crypto_register_shash(&ifxdeu_md5_alg)))
 284         goto md5_err;
 285
 286     printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
 287     return ret;
 288
 289 md5_err:
 290     printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
 291     return ret;
 292 }
 293
 294 /*! \fn void ifxdeu_fini_md5 (void)
 295   * \ingroup IFX_MD5_FUNCTIONS
 296   * \brief unregister md5 driver
 297 */
 298
 299 void ifxdeu_fini_md5 (void)
 300 {
 301     crypto_unregister_shash(&ifxdeu_md5_alg);
 302
 303 }
 304