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 static spinlock_t lock;
  68 #define CRTCL_SECT_INIT        spin_lock_init(&lock)
  69 #define CRTCL_SECT_START       spin_lock_irqsave(&lock, flag)
  70 #define CRTCL_SECT_END         spin_unlock_irqrestore(&lock, flag)
  71
  72 //#define CRYPTO_DEBUG
  73 #ifdef CRYPTO_DEBUG
  74 extern char debug_level;
  75 #define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
  76 #else
  77 #define DPRINTF(level, format, args...)
  78 #endif
  79
  80 struct md5_ctx {
  81     int started;
  82     u32 hash[MD5_HASH_WORDS];
  83     u32 block[MD5_BLOCK_WORDS];
  84     u64 byte_count;
  85 };
  86
  87 extern int disable_deudma;
  88
  89 /*! \fn static u32 endian_swap(u32 input)
  90  *  \ingroup IFX_MD5_FUNCTIONS
  91  *  \brief perform dword level endian swap
  92  *  \param input value of dword that requires to be swapped
  93 */
  94 static u32 endian_swap(u32 input)
  95 {
  96     u8 *ptr = (u8 *)&input;
  97
  98     return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
  99 }
 100
 101 /*! \fn static void md5_transform(u32 *hash, u32 const *in)
 102  *  \ingroup IFX_MD5_FUNCTIONS
 103  *  \brief main interface to md5 hardware
 104  *  \param hash current hash value
 105  *  \param in 64-byte block of input
 106 */
 107 static void md5_transform(struct md5_ctx *mctx, u32 *hash, u32 const *in)
 108 {
 109     int i;
 110     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 111     unsigned long flag;
 112
 113     CRTCL_SECT_START;
 114
 115     if (mctx->started) {
 116         hashs->D1R = endian_swap(*((u32 *) hash + 0));
 117         hashs->D2R = endian_swap(*((u32 *) hash + 1));
 118         hashs->D3R = endian_swap(*((u32 *) hash + 2));
 119         hashs->D4R = endian_swap(*((u32 *) hash + 3));
 120     }
 121
 122     for (i = 0; i < 16; i++) {
 123         hashs->MR = endian_swap(in[i]);
 124 //      printk("in[%d]: %08x\n", i, endian_swap(in[i]));
 125     };
 126
 127     //wait for processing
 128     while (hashs->controlr.BSY) {
 129         // this will not take long
 130     }
 131
 132     *((u32 *) hash + 0) = endian_swap (hashs->D1R);
 133     *((u32 *) hash + 1) = endian_swap (hashs->D2R);
 134     *((u32 *) hash + 2) = endian_swap (hashs->D3R);
 135     *((u32 *) hash + 3) = endian_swap (hashs->D4R);
 136
 137     mctx->started = 1;
 138
 139     CRTCL_SECT_END;
 140 }
 141
 142 /*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx)
 143  *  \ingroup IFX_MD5_FUNCTIONS
 144  *  \brief interfacing function for md5_transform()
 145  *  \param ctx crypto context
 146 */
 147 static inline void md5_transform_helper(struct md5_ctx *ctx)
 148 {
 149     //le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
 150     md5_transform(ctx, ctx->hash, ctx->block);
 151 }
 152
 153 /*! \fn static void md5_init(struct crypto_tfm *tfm)
 154  *  \ingroup IFX_MD5_FUNCTIONS
 155  *  \brief initialize md5 hardware
 156  *  \param tfm linux crypto algo transform
 157 */
 158 static int md5_init(struct shash_desc *desc)
 159 {
 160     struct md5_ctx *mctx = shash_desc_ctx(desc);
 161     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 162
 163     hash->controlr.ENDI = 0;
 164     hash->controlr.SM = 1;
 165     hash->controlr.ALGO = 1;    // 1 = md5  0 = sha1
 166     hash->controlr.INIT = 1;    // Initialize the hash operation by writing a '1' to the INIT bit.
 167
 168     mctx->byte_count = 0;
 169     mctx->started = 0;
 170     return 0;
 171 }
 172
 173 /*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 174  *  \ingroup IFX_MD5_FUNCTIONS
 175  *  \brief on-the-fly md5 computation
 176  *  \param tfm linux crypto algo transform
 177  *  \param data input data
 178  *  \param len size of input data
 179 */
 180 static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
 181 {
 182     struct md5_ctx *mctx = shash_desc_ctx(desc);
 183     const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 184
 185     mctx->byte_count += len;
 186
 187     if (avail > len) {
 188         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 189                data, len);
 190         return 0;
 191     }
 192
 193     memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 194            data, avail);
 195
 196     md5_transform_helper(mctx);
 197     data += avail;
 198     len -= avail;
 199
 200     while (len >= sizeof(mctx->block)) {
 201         memcpy(mctx->block, data, sizeof(mctx->block));
 202         md5_transform_helper(mctx);
 203         data += sizeof(mctx->block);
 204         len -= sizeof(mctx->block);
 205     }
 206
 207     memcpy(mctx->block, data, len);
 208     return 0;
 209 }
 210
 211 /*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out)
 212  *  \ingroup IFX_MD5_FUNCTIONS
 213  *  \brief compute final md5 value
 214  *  \param tfm linux crypto algo transform
 215  *  \param out final md5 output value
 216 */
 217 static int md5_final(struct shash_desc *desc, u8 *out)
 218 {
 219     struct md5_ctx *mctx = shash_desc_ctx(desc);
 220     const unsigned int offset = mctx->byte_count & 0x3f;
 221     char *p = (char *)mctx->block + offset;
 222     int padding = 56 - (offset + 1);
 223     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 224     unsigned long flag;
 225
 226     *p++ = 0x80;
 227     if (padding < 0) {
 228         memset(p, 0x00, padding + sizeof (u64));
 229         md5_transform_helper(mctx);
 230         p = (char *)mctx->block;
 231         padding = 56;
 232     }
 233
 234     memset(p, 0, padding);
 235     mctx->block[14] = endian_swap(mctx->byte_count << 3);
 236     mctx->block[15] = endian_swap(mctx->byte_count >> 29);
 237
 238 #if 0
 239     le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
 240                       sizeof(u64)) / sizeof(u32));
 241 #endif
 242
 243     md5_transform(mctx, mctx->hash, mctx->block);
 244
 245     CRTCL_SECT_START;
 246
 247     *((u32 *) out + 0) = endian_swap (hashs->D1R);
 248     *((u32 *) out + 1) = endian_swap (hashs->D2R);
 249     *((u32 *) out + 2) = endian_swap (hashs->D3R);
 250     *((u32 *) out + 3) = endian_swap (hashs->D4R);
 251
 252     CRTCL_SECT_END;
 253
 254     // Wipe context
 255     memset(mctx, 0, sizeof(*mctx));
 256
 257     return 0;
 258 }
 259
 260 /*
 261  * \brief MD5 function mappings
 262 */
 263 static struct shash_alg ifxdeu_md5_alg = {
 264     .digestsize         =       MD5_DIGEST_SIZE,
 265     .init               =       md5_init,
 266     .update             =       md5_update,
 267     .final              =       md5_final,
 268     .descsize           =       sizeof(struct md5_ctx),
 269     .base               =       {
 270                 .cra_name       =       "md5",
 271                 .cra_driver_name=       "ifxdeu-md5",
 272                 .cra_priority   =       300,
 273                 .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
 274                 .cra_blocksize  =       MD5_HMAC_BLOCK_SIZE,
 275                 .cra_module     =       THIS_MODULE,
 276     }
 277 };
 278
 279 /*! \fn int ifxdeu_init_md5 (void)
 280  *  \ingroup IFX_MD5_FUNCTIONS
 281  *  \brief initialize md5 driver
 282 */
 283 int ifxdeu_init_md5 (void)
 284 {
 285     int ret = -ENOSYS;
 286
 287
 288     if ((ret = crypto_register_shash(&ifxdeu_md5_alg)))
 289         goto md5_err;
 290
 291     CRTCL_SECT_INIT;
 292
 293     printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
 294     return ret;
 295
 296 md5_err:
 297     printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
 298     return ret;
 299 }
 300
 301 /*! \fn void ifxdeu_fini_md5 (void)
 302   * \ingroup IFX_MD5_FUNCTIONS
 303   * \brief unregister md5 driver
 304 */
 305
 306 void ifxdeu_fini_md5 (void)
 307 {
 308     crypto_unregister_shash(&ifxdeu_md5_alg);
 309
 310 }
 311