target/linux/ifxmips/files-2.6.32/drivers/crypto/ifxmips/ifxmips_md5.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2010 Ralph Hempel <ralph.hempel@lantiq.com>
  17  *   Copyright (C) 2009 Mohammad Firdaus
  18  */
  19
  20 /*!
  21   \defgroup    IFX_DEU IFX_DEU_DRIVERS
  22   \ingroup API
  23   \brief ifx deu driver module
  24 */
  25
  26 /*!
  27   \file         ifxmips_md5.c
  28   \ingroup      IFX_DEU
  29   \brief        MD5 encryption deu driver file
  30 */
  31
  32 /*!
  33   \defgroup IFX_MD5_FUNCTIONS IFX_MD5_FUNCTIONS
  34   \ingroup IFX_DEU
  35   \brief ifx deu MD5 functions
  36 */
  37
  38 /*Project header files */
  39 #include <linux/init.h>
  40 #include <linux/module.h>
  41 #include <linux/string.h>
  42 #include <linux/crypto.h>
  43 #include <linux/types.h>
  44 #include <asm/byteorder.h>
  45 #include "ifxmips_deu.h"
  46
  47 #define MD5_DIGEST_SIZE     16
  48 #define MD5_HMAC_BLOCK_SIZE 64
  49 #define MD5_BLOCK_WORDS     16
  50 #define MD5_HASH_WORDS      4
  51 #define HASH_START   IFX_HASH_CON
  52
  53 static spinlock_t lock;
  54 #define CRTCL_SECT_INIT        spin_lock_init(&lock)
  55 #define CRTCL_SECT_START       spin_lock_irqsave(&lock, flag)
  56 #define CRTCL_SECT_END         spin_unlock_irqrestore(&lock, flag)
  57
  58 struct md5_ctx {
  59     u32 hash[MD5_HASH_WORDS];
  60     u32 block[MD5_BLOCK_WORDS];
  61     u64 byte_count;
  62 };
  63
  64 extern int disable_deudma;
  65
  66 /*! \fn static u32 endian_swap(u32 input)
  67  *  \ingroup IFX_MD5_FUNCTIONS
  68  *  \brief perform dword level endian swap
  69  *  \param input value of dword that requires to be swapped
  70 */
  71 static u32 endian_swap(u32 input)
  72 {
  73     u8 *ptr = (u8 *)&input;
  74
  75     return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
  76 }
  77
  78 /*! \fn static void md5_transform(u32 *hash, u32 const *in)
  79  *  \ingroup IFX_MD5_FUNCTIONS
  80  *  \brief main interface to md5 hardware
  81  *  \param hash current hash value
  82  *  \param in 64-byte block of input
  83 */
  84 static void md5_transform(u32 *hash, u32 const *in)
  85 {
  86         int i;
  87     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
  88     ulong flag;
  89
  90     CRTCL_SECT_START;
  91
  92     for (i = 0; i < 16; i++) {
  93         hashs->MR = endian_swap(in[i]);
  94     };
  95
  96     //wait for processing
  97     while (hashs->controlr.BSY) {
  98         // this will not take long
  99     }
 100
 101     CRTCL_SECT_END;
 102 }
 103
 104 /*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx)
 105  *  \ingroup IFX_MD5_FUNCTIONS
 106  *  \brief interfacing function for md5_transform()
 107  *  \param ctx crypto context
 108 */
 109 static inline void md5_transform_helper(struct md5_ctx *ctx)
 110 {
 111     //le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
 112     md5_transform(ctx->hash, ctx->block);
 113 }
 114
 115 /*! \fn static void md5_init(struct crypto_tfm *tfm)
 116  *  \ingroup IFX_MD5_FUNCTIONS
 117  *  \brief initialize md5 hardware
 118  *  \param tfm linux crypto algo transform
 119 */
 120 static void md5_init(struct crypto_tfm *tfm)
 121 {
 122     struct md5_ctx *mctx = crypto_tfm_ctx(tfm);
 123         volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 124
 125     hash->controlr.SM = 1;
 126     hash->controlr.ALGO = 1;    // 1 = md5  0 = sha1
 127     hash->controlr.INIT = 1;    // Initialize the hash operation by writing a '1' to the INIT bit.
 128
 129     mctx->byte_count = 0;
 130 }
 131
 132 /*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 133  *  \ingroup IFX_MD5_FUNCTIONS
 134  *  \brief on-the-fly md5 computation
 135  *  \param tfm linux crypto algo transform
 136  *  \param data input data
 137  *  \param len size of input data
 138 */
 139 static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 140 {
 141     struct md5_ctx *mctx = crypto_tfm_ctx(tfm);
 142     const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 143
 144     mctx->byte_count += len;
 145
 146     if (avail > len) {
 147         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 148                data, len);
 149         return;
 150     }
 151
 152     memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 153            data, avail);
 154
 155     md5_transform_helper(mctx);
 156     data += avail;
 157     len -= avail;
 158
 159     while (len >= sizeof(mctx->block)) {
 160         memcpy(mctx->block, data, sizeof(mctx->block));
 161         md5_transform_helper(mctx);
 162         data += sizeof(mctx->block);
 163         len -= sizeof(mctx->block);
 164     }
 165
 166     memcpy(mctx->block, data, len);
 167 }
 168
 169 /*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out)
 170  *  \ingroup IFX_MD5_FUNCTIONS
 171  *  \brief compute final md5 value
 172  *  \param tfm linux crypto algo transform
 173  *  \param out final md5 output value
 174 */
 175 static void md5_final(struct crypto_tfm *tfm, u8 *out)
 176 {
 177     struct md5_ctx *mctx = crypto_tfm_ctx(tfm);
 178     const unsigned int offset = mctx->byte_count & 0x3f;
 179     char *p = (char *)mctx->block + offset;
 180     int padding = 56 - (offset + 1);
 181     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 182     u32 flag;
 183
 184     *p++ = 0x80;
 185     if (padding < 0) {
 186         memset(p, 0x00, padding + sizeof (u64));
 187         md5_transform_helper(mctx);
 188         p = (char *)mctx->block;
 189         padding = 56;
 190     }
 191
 192     memset(p, 0, padding);
 193     mctx->block[14] = endian_swap(mctx->byte_count << 3);
 194     mctx->block[15] = endian_swap(mctx->byte_count >> 29);
 195
 196 #if 0
 197     le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
 198                       sizeof(u64)) / sizeof(u32));
 199 #endif
 200
 201     md5_transform(mctx->hash, mctx->block);
 202
 203     CRTCL_SECT_START;
 204
 205     *((u32 *) out + 0) = endian_swap (hashs->D1R);
 206     *((u32 *) out + 1) = endian_swap (hashs->D2R);
 207     *((u32 *) out + 2) = endian_swap (hashs->D3R);
 208     *((u32 *) out + 3) = endian_swap (hashs->D4R);
 209
 210     CRTCL_SECT_END;
 211
 212     // Wipe context
 213     memset(mctx, 0, sizeof(*mctx));
 214 }
 215
 216 /*
 217  * \brief MD5 function mappings
 218 */
 219 static struct crypto_alg ifxdeu_md5_alg = {
 220     .cra_name           =   "md5",
 221     .cra_driver_name    =   "ifxdeu-md5",
 222     .cra_flags          =   CRYPTO_ALG_TYPE_DIGEST,
 223     .cra_blocksize          =   MD5_HMAC_BLOCK_SIZE,
 224     .cra_ctxsize            =   sizeof(struct md5_ctx),
 225     .cra_module         =   THIS_MODULE,
 226     .cra_list           =   LIST_HEAD_INIT(ifxdeu_md5_alg.cra_list),
 227     .cra_u              =   { .digest = {
 228     .dia_digestsize         =   MD5_DIGEST_SIZE,
 229     .dia_init               =   md5_init,
 230     .dia_update             =   md5_update,
 231     .dia_final              =   md5_final } }
 232 };
 233
 234 /*! \fn int __init ifxdeu_init_md5 (void)
 235  *  \ingroup IFX_MD5_FUNCTIONS
 236  *  \brief initialize md5 driver
 237 */
 238 int __init ifxdeu_init_md5 (void)
 239 {
 240     int ret;
 241
 242     if ((ret = crypto_register_alg(&ifxdeu_md5_alg)))
 243         goto md5_err;
 244
 245     CRTCL_SECT_INIT;
 246
 247     printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
 248     return ret;
 249
 250 md5_err:
 251     printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
 252     return ret;
 253 }
 254
 255 /*! \fn void __exit ifxdeu_fini_md5 (void)
 256   * \ingroup IFX_MD5_FUNCTIONS
 257   * \brief unregister md5 driver
 258 */
 259
 260 void __exit ifxdeu_fini_md5 (void)
 261 {
 262     crypto_unregister_alg (&ifxdeu_md5_alg);
 263 }
 264