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 void md5_transform(u32 *hash, u32 const *in)
  85  *  \ingroup IFX_MD5_FUNCTIONS
  86  *  \brief main interface to md5 hardware
  87  *  \param hash current hash value
  88  *  \param in 64-byte block of input
  89 */
  90 static void md5_transform(struct md5_ctx *mctx, u32 *hash, u32 const *in)
  91 {
  92     int i;
  93     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
  94     unsigned long flag;
  95
  96     CRTCL_SECT_HASH_START;
  97
  98     MD5_HASH_INIT;
  99
 100     if (mctx->started) {
 101         hashs->D1R = *((u32 *) hash + 0);
 102         hashs->D2R = *((u32 *) hash + 1);
 103         hashs->D3R = *((u32 *) hash + 2);
 104         hashs->D4R = *((u32 *) hash + 3);
 105     }
 106
 107     for (i = 0; i < 16; i++) {
 108         hashs->MR = in[i];
 109 //      printk("in[%d]: %08x\n", i, in[i]);
 110     };
 111
 112     //wait for processing
 113     while (hashs->controlr.BSY) {
 114         // this will not take long
 115     }
 116
 117     *((u32 *) hash + 0) = hashs->D1R;
 118     *((u32 *) hash + 1) = hashs->D2R;
 119     *((u32 *) hash + 2) = hashs->D3R;
 120     *((u32 *) hash + 3) = hashs->D4R;
 121
 122     CRTCL_SECT_HASH_END;
 123
 124     mctx->started = 1;
 125 }
 126
 127 /*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx)
 128  *  \ingroup IFX_MD5_FUNCTIONS
 129  *  \brief interfacing function for md5_transform()
 130  *  \param ctx crypto context
 131 */
 132 static inline void md5_transform_helper(struct md5_ctx *ctx)
 133 {
 134     //le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
 135     md5_transform(ctx, ctx->hash, ctx->block);
 136 }
 137
 138 /*! \fn static void md5_init(struct crypto_tfm *tfm)
 139  *  \ingroup IFX_MD5_FUNCTIONS
 140  *  \brief initialize md5 hardware
 141  *  \param tfm linux crypto algo transform
 142 */
 143 static int md5_init(struct shash_desc *desc)
 144 {
 145     struct md5_ctx *mctx = shash_desc_ctx(desc);
 146     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 147
 148     mctx->byte_count = 0;
 149     mctx->started = 0;
 150     return 0;
 151 }
 152
 153 /*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 154  *  \ingroup IFX_MD5_FUNCTIONS
 155  *  \brief on-the-fly md5 computation
 156  *  \param tfm linux crypto algo transform
 157  *  \param data input data
 158  *  \param len size of input data
 159 */
 160 static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 161 {
 162     struct md5_ctx *mctx = shash_desc_ctx(desc);
 163     const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 164
 165     mctx->byte_count += len;
 166
 167     if (avail > len) {
 168         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 169                data, len);
 170         return 0;
 171     }
 172
 173     memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 174            data, avail);
 175
 176     md5_transform_helper(mctx);
 177     data += avail;
 178     len -= avail;
 179
 180     while (len >= sizeof(mctx->block)) {
 181         memcpy(mctx->block, data, sizeof(mctx->block));
 182         md5_transform_helper(mctx);
 183         data += sizeof(mctx->block);
 184         len -= sizeof(mctx->block);
 185     }
 186
 187     memcpy(mctx->block, data, len);
 188     return 0;
 189 }
 190
 191 /*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out)
 192  *  \ingroup IFX_MD5_FUNCTIONS
 193  *  \brief compute final md5 value
 194  *  \param tfm linux crypto algo transform
 195  *  \param out final md5 output value
 196 */
 197 static int md5_final(struct shash_desc *desc, u8 *out)
 198 {
 199     struct md5_ctx *mctx = shash_desc_ctx(desc);
 200     const unsigned int offset = mctx->byte_count & 0x3f;
 201     char *p = (char *)mctx->block + offset;
 202     int padding = 56 - (offset + 1);
 203     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 204     unsigned long flag;
 205
 206     *p++ = 0x80;
 207     if (padding < 0) {
 208         memset(p, 0x00, padding + sizeof (u64));
 209         md5_transform_helper(mctx);
 210         p = (char *)mctx->block;
 211         padding = 56;
 212     }
 213
 214     memset(p, 0, padding);
 215     mctx->block[14] = le32_to_cpu(mctx->byte_count << 3);
 216     mctx->block[15] = le32_to_cpu(mctx->byte_count >> 29);
 217
 218     md5_transform(mctx, mctx->hash, mctx->block);
 219
 220     memcpy(out, mctx->hash, MD5_DIGEST_SIZE);
 221
 222     // Wipe context
 223     memset(mctx, 0, sizeof(*mctx));
 224
 225     return 0;
 226 }
 227
 228 /*
 229  * \brief MD5 function mappings
 230 */
 231 static struct shash_alg ifxdeu_md5_alg = {
 232     .digestsize         =       MD5_DIGEST_SIZE,
 233     .init               =       md5_init,
 234     .update             =       md5_update,
 235     .final              =       md5_final,
 236     .descsize           =       sizeof(struct md5_ctx),
 237     .base               =       {
 238                 .cra_name       =       "md5",
 239                 .cra_driver_name=       "ifxdeu-md5",
 240                 .cra_priority   =       300,
 241                 .cra_flags      =       CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
 242                 .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
 243                 .cra_module     =       THIS_MODULE,
 244     }
 245 };
 246
 247 /*! \fn int ifxdeu_init_md5 (void)
 248  *  \ingroup IFX_MD5_FUNCTIONS
 249  *  \brief initialize md5 driver
 250 */
 251 int ifxdeu_init_md5 (void)
 252 {
 253     int ret = -ENOSYS;
 254
 255
 256     if ((ret = crypto_register_shash(&ifxdeu_md5_alg)))
 257         goto md5_err;
 258
 259     printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
 260     return ret;
 261
 262 md5_err:
 263     printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
 264     return ret;
 265 }
 266
 267 /*! \fn void ifxdeu_fini_md5 (void)
 268   * \ingroup IFX_MD5_FUNCTIONS
 269   * \brief unregister md5 driver
 270 */
 271
 272 void ifxdeu_fini_md5 (void)
 273 {
 274     crypto_unregister_shash(&ifxdeu_md5_alg);
 275
 276 }