target/linux/ifxmips/files-2.6.33/drivers/crypto/ifxmips/ifxmips_md5_hmac.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_hmac.c
  28   \ingroup IFX_DEU
  29   \brief MD5-HMAC encryption deu driver file
  30 */
  31
  32 /*!
  33  \defgroup IFX_MD5_HMAC_FUNCTIONS IFX_MD5_HMAC_FUNCTIONS
  34  \ingroup IFX_DEU
  35  \brief ifx md5-hmac driver 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 MD5_HMAC_DBN_TEMP_SIZE  1024 // size in dword, needed for dbn workaround
  52 #define HASH_START   IFX_HASH_CON
  53
  54 static spinlock_t lock;
  55 #define CRTCL_SECT_INIT        spin_lock_init(&lock)
  56 #define CRTCL_SECT_START       spin_lock_irqsave(&lock, flag)
  57 #define CRTCL_SECT_END         spin_unlock_irqrestore(&lock, flag)
  58
  59 struct md5_hmac_ctx {
  60     u32 hash[MD5_HASH_WORDS];
  61     u32 block[MD5_BLOCK_WORDS];
  62     u64 byte_count;
  63     u32 dbn;
  64     u32 temp[MD5_HMAC_DBN_TEMP_SIZE];
  65 };
  66
  67 extern int disable_deudma;
  68
  69 /*! \fn static u32 endian_swap(u32 input)
  70  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
  71  *  \brief perform dword level endian swap
  72  *  \param input value of dword that requires to be swapped
  73 */
  74 static u32 endian_swap(u32 input)
  75 {
  76     u8 *ptr = (u8 *)&input;
  77
  78     return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
  79 }
  80
  81 /*! \fn static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
  82  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
  83  *  \brief save input block to context
  84  *  \param tfm linux crypto algo transform
  85  *  \param in 64-byte block of input
  86 */
  87 static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
  88 {
  89     struct md5_hmac_ctx *mctx = crypto_tfm_ctx(tfm);
  90
  91     memcpy(&mctx->temp[mctx->dbn<<4], in, 64); //dbn workaround
  92         mctx->dbn += 1;
  93
  94     if ( (mctx->dbn<<4) > MD5_HMAC_DBN_TEMP_SIZE )
  95     {
  96         printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n");
  97     }
  98
  99 }
 100
 101 /*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 102  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 103  *  \brief sets md5 hmac key
 104  *  \param tfm linux crypto algo transform
 105  *  \param key input key
 106  *  \param keylen key length greater than 64 bytes IS NOT SUPPORTED
 107 */
 108 int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 109 {
 110     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 111     int i, j;
 112     u32 *in_key = (u32 *)key;
 113
 114     hash->KIDX = 0x80000000; // reset all 16 words of the key to '0'
 115     asm("sync");
 116
 117     j = 0;
 118     for (i = 0; i < keylen; i+=4)
 119     {
 120          hash->KIDX = j;
 121          asm("sync");
 122          hash->KEY = *((u32 *) in_key + j);
 123          j++;
 124     }
 125
 126     return 0;
 127 }
 128
 129 /*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
 130  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 131  *  \brief initialize md5 hmac context
 132  *  \param tfm linux crypto algo transform
 133 */
 134 void md5_hmac_init(struct crypto_tfm *tfm)
 135 {
 136     struct md5_hmac_ctx *mctx = crypto_tfm_ctx(tfm);
 137
 138     memset(mctx, 0, sizeof(struct md5_hmac_ctx));
 139     mctx->dbn = 0; //dbn workaround
 140 }
 141
 142 /*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 143  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 144  *  \brief on-the-fly md5 hmac computation
 145  *  \param tfm linux crypto algo transform
 146  *  \param data input data
 147  *  \param len size of input data
 148 */
 149 void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 150 {
 151     struct md5_hmac_ctx *mctx = crypto_tfm_ctx(tfm);
 152     const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
 153
 154     mctx->byte_count += len;
 155
 156     if (avail > len) {
 157         memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 158                data, len);
 159         return;
 160     }
 161
 162     memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
 163            data, avail);
 164
 165     md5_hmac_transform(tfm, mctx->block);
 166     data += avail;
 167     len -= avail;
 168
 169     while (len >= sizeof(mctx->block)) {
 170         memcpy(mctx->block, data, sizeof(mctx->block));
 171         md5_hmac_transform(tfm, mctx->block);
 172         data += sizeof(mctx->block);
 173         len -= sizeof(mctx->block);
 174     }
 175
 176     memcpy(mctx->block, data, len);
 177
 178 }
 179
 180 /*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
 181  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 182  *  \brief compute final md5 hmac value
 183  *  \param tfm linux crypto algo transform
 184  *  \param out final md5 hmac output value
 185 */
 186 void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
 187 {
 188     struct md5_hmac_ctx *mctx = crypto_tfm_ctx(tfm);
 189     const unsigned int offset = mctx->byte_count & 0x3f;
 190     char *p = (char *)mctx->block + offset;
 191     int padding = 56 - (offset + 1);
 192     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 193     u32 flag;
 194     int i = 0;
 195     int dbn;
 196     u32 *in = &mctx->temp[0];
 197
 198     *p++ = 0x80;
 199     if (padding < 0) {
 200         memset(p, 0x00, padding + sizeof (u64));
 201         md5_hmac_transform(tfm, mctx->block);
 202         p = (char *)mctx->block;
 203         padding = 56;
 204     }
 205
 206     memset(p, 0, padding);
 207     mctx->block[14] = endian_swap((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
 208     mctx->block[15] = 0x00000000;
 209
 210     md5_hmac_transform(tfm, mctx->block);
 211
 212     CRTCL_SECT_START;
 213
 214     printk("dbn = %d\n", mctx->dbn);
 215     hashs->DBN = mctx->dbn;
 216
 217     *IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
 218
 219     //wait for processing
 220     while (hashs->controlr.BSY) {
 221         // this will not take long
 222     }
 223
 224 for (dbn = 0; dbn < mctx->dbn; dbn++)
 225 {
 226     for (i = 0; i < 16; i++) {
 227         hashs->MR = in[i];
 228     };
 229
 230     hashs->controlr.GO = 1;
 231     asm("sync");
 232
 233     //wait for processing
 234     while (hashs->controlr.BSY) {
 235         // this will not take long
 236     }
 237
 238     in += 16;
 239 }
 240
 241
 242 #if 1
 243     //wait for digest ready
 244     while (! hashs->controlr.DGRY) {
 245         // this will not take long
 246     }
 247 #endif
 248
 249     *((u32 *) out + 0) = hashs->D1R;
 250     *((u32 *) out + 1) = hashs->D2R;
 251     *((u32 *) out + 2) = hashs->D3R;
 252     *((u32 *) out + 3) = hashs->D4R;
 253     *((u32 *) out + 4) = hashs->D5R;
 254
 255     CRTCL_SECT_END;
 256 }
 257
 258 /*
 259  * \brief MD5_HMAC function mappings
 260 */
 261
 262 static struct crypto_alg ifxdeu_md5_hmac_alg = {
 263     .cra_name           =   "hmac(md5)",
 264     .cra_driver_name    =   "ifxdeu-md5_hmac",
 265     .cra_flags          =   CRYPTO_ALG_TYPE_DIGEST,
 266     .cra_blocksize          =   MD5_HMAC_BLOCK_SIZE,
 267     .cra_ctxsize            =   sizeof(struct md5_hmac_ctx),
 268     .cra_module         =   THIS_MODULE,
 269     .cra_list           =   LIST_HEAD_INIT(ifxdeu_md5_hmac_alg.cra_list),
 270     .cra_u              =   { .digest = {
 271     .dia_digestsize         =   MD5_DIGEST_SIZE,
 272         .dia_setkey             =       md5_hmac_setkey,
 273         .dia_init               =       md5_hmac_init,
 274         .dia_update             =       md5_hmac_update,
 275         .dia_final              =       md5_hmac_final } }
 276 };
 277
 278 /*! \fn int __init ifxdeu_init_md5_hmac (void)
 279  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 280  *  \brief initialize md5 hmac driver
 281 */
 282 int __init ifxdeu_init_md5_hmac (void)
 283 {
 284     int ret;
 285
 286     if ((ret = crypto_register_alg(&ifxdeu_md5_hmac_alg)))
 287         goto md5_hmac_err;
 288
 289     CRTCL_SECT_INIT;
 290
 291     printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
 292     return ret;
 293
 294 md5_hmac_err:
 295     printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
 296     return ret;
 297 }
 298
 299 /** \fn void __exit ifxdeu_fini_md5_hmac (void)
 300  *  \ingroup IFX_MD5_HMAC_FUNCTIONS
 301  *  \brief unregister md5 hmac driver
 302 */
 303 void __exit ifxdeu_fini_md5_hmac (void)
 304 {
 305     crypto_unregister_alg (&ifxdeu_md5_hmac_alg);
 306 }
 307