target/linux/ifxmips/files/drivers/crypto/ifxmips/ifxmips_sha1_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_sha1_hmac.c
  28   \ingroup IFX_DEU
  29   \brief SHA1-HMAC deu driver file
  30 */
  31
  32 /*!
  33   \defgroup IFX_SHA1_HMAC_FUNCTIONS IFX_SHA1_HMAC_FUNCTIONS
  34   \ingroup IFX_DEU
  35   \brief ifx sha1 hmac functions
  36 */
  37
  38
  39 /* Project header */
  40 #include <linux/init.h>
  41 #include <linux/module.h>
  42 #include <linux/mm.h>
  43 #include <linux/crypto.h>
  44 #include <linux/cryptohash.h>
  45 #include <linux/types.h>
  46 #include <asm/scatterlist.h>
  47 #include <asm/byteorder.h>
  48 #include <linux/delay.h>
  49 #include "ifxmips_deu.h"
  50
  51 #ifdef CONFIG_CRYPTO_DEV_IFXMIPS_SHA1_HMAC
  52
  53 #define SHA1_DIGEST_SIZE    20
  54 #define SHA1_HMAC_BLOCK_SIZE    64
  55 #define SHA1_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround
  56 #define HASH_START   IFX_HASH_CON
  57
  58 static spinlock_t lock;
  59 #define CRTCL_SECT_INIT        spin_lock_init(&lock)
  60 #define CRTCL_SECT_START       spin_lock_irqsave(&lock, flag)
  61 #define CRTCL_SECT_END         spin_unlock_irqrestore(&lock, flag)
  62
  63 struct sha1_hmac_ctx {
  64         u64 count;
  65         u32 state[5];
  66         u8 buffer[64];
  67     u32 dbn;
  68     u32 temp[SHA1_HMAC_DBN_TEMP_SIZE];
  69 };
  70
  71 extern int disable_deudma;
  72
  73 /*! \fn static void sha1_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
  74  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
  75  *  \brief save input block to context
  76  *  \param tfm linux crypto algo transform
  77  *  \param in 64-byte block of input
  78 */
  79 static void sha1_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
  80 {
  81     struct sha1_hmac_ctx *sctx = crypto_tfm_ctx(tfm);
  82
  83     memcpy(&sctx->temp[sctx->dbn<<4], in, 64); //dbn workaround
  84     sctx->dbn += 1;
  85
  86     if ( (sctx->dbn<<4) > SHA1_HMAC_DBN_TEMP_SIZE )
  87     {
  88         printk("SHA1_HMAC_DBN_TEMP_SIZE exceeded\n");
  89     }
  90
  91 }
  92
  93 /*! \fn int sha1_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
  94  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
  95  *  \brief sets sha1 hmac key
  96  *  \param tfm linux crypto algo transform
  97  *  \param key input key
  98  *  \param keylen key length greater than 64 bytes IS NOT SUPPORTED
  99 */
 100 int sha1_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 101 {
 102     volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
 103     int i, j;
 104     u32 *in_key = (u32 *)key;
 105
 106     hash->KIDX = 0x80000000; // reset all 16 words of the key to '0'
 107     asm("sync");
 108
 109     j = 0;
 110     for (i = 0; i < keylen; i+=4)
 111     {
 112          hash->KIDX = j;
 113          asm("sync");
 114          hash->KEY = *((u32 *) in_key + j);
 115          j++;
 116     }
 117
 118     return 0;
 119 }
 120
 121 /*! \fn void sha1_hmac_init(struct crypto_tfm *tfm)
 122  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 123  *  \brief initialize sha1 hmac context
 124  *  \param tfm linux crypto algo transform
 125 */
 126 void sha1_hmac_init(struct crypto_tfm *tfm)
 127 {
 128     struct sha1_hmac_ctx *sctx = crypto_tfm_ctx(tfm);
 129
 130         memset(sctx, 0, sizeof(struct sha1_hmac_ctx));
 131     sctx->dbn = 0; //dbn workaround
 132 }
 133
 134 /*! \fn static void sha1_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
 135  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 136  *  \brief on-the-fly sha1 hmac computation
 137  *  \param tfm linux crypto algo transform
 138  *  \param data input data
 139  *  \param len size of input data
 140 */
 141 static void sha1_hmac_update(struct crypto_tfm *tfm, const u8 *data,
 142             unsigned int len)
 143 {
 144     struct sha1_hmac_ctx *sctx = crypto_tfm_ctx(tfm);
 145     unsigned int i, j;
 146
 147     j = (sctx->count >> 3) & 0x3f;
 148     sctx->count += len << 3;
 149     //printk("sctx->count = %d\n", (sctx->count >> 3));
 150
 151     if ((j + len) > 63) {
 152         memcpy (&sctx->buffer[j], data, (i = 64 - j));
 153         sha1_hmac_transform (tfm, (const u32 *)sctx->buffer);
 154         for (; i + 63 < len; i += 64) {
 155             sha1_hmac_transform (tfm, (const u32 *)&data[i]);
 156         }
 157
 158         j = 0;
 159     }
 160     else
 161         i = 0;
 162
 163     memcpy (&sctx->buffer[j], &data[i], len - i);
 164 }
 165
 166 /*! \fn static void sha1_hmac_final(struct crypto_tfm *tfm, u8 *out)
 167  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 168  *  \brief ompute final sha1 hmac value
 169  *  \param tfm linux crypto algo transform
 170  *  \param out final sha1 hmac output value
 171 */
 172 static void sha1_hmac_final(struct crypto_tfm *tfm, u8 *out)
 173 {
 174         struct sha1_hmac_ctx *sctx = crypto_tfm_ctx(tfm);
 175     u32 index, padlen;
 176     u64 t;
 177     u8 bits[8] = { 0, };
 178     static const u8 padding[64] = { 0x80, };
 179     volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
 180     ulong flag;
 181     int i = 0;
 182     int dbn;
 183     u32 *in = &sctx->temp[0];
 184
 185     t = sctx->count + 512; // need to add 512 bit of the IPAD operation
 186     bits[7] = 0xff & t;
 187     t >>= 8;
 188     bits[6] = 0xff & t;
 189     t >>= 8;
 190     bits[5] = 0xff & t;
 191     t >>= 8;
 192     bits[4] = 0xff & t;
 193     t >>= 8;
 194     bits[3] = 0xff & t;
 195     t >>= 8;
 196     bits[2] = 0xff & t;
 197     t >>= 8;
 198     bits[1] = 0xff & t;
 199     t >>= 8;
 200     bits[0] = 0xff & t;
 201
 202     /* Pad out to 56 mod 64 */
 203     index = (sctx->count >> 3) & 0x3f;
 204     padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
 205     sha1_hmac_update (tfm, padding, padlen);
 206
 207     /* Append length */
 208     sha1_hmac_update (tfm, bits, sizeof bits);
 209
 210     CRTCL_SECT_START;
 211
 212     hashs->DBN = sctx->dbn;
 213
 214     //for vr9 change, ENDI = 1
 215     *IFX_HASH_CON = HASH_CON_VALUE;
 216
 217     //wait for processing
 218     while (hashs->controlr.BSY) {
 219         // this will not take long
 220     }
 221
 222     for (dbn = 0; dbn < sctx->dbn; dbn++)
 223     {
 224     for (i = 0; i < 16; i++) {
 225         hashs->MR = in[i];
 226     };
 227
 228     hashs->controlr.GO = 1;
 229     asm("sync");
 230
 231     //wait for processing
 232     while (hashs->controlr.BSY) {
 233             // this will not take long
 234     }
 235
 236     in += 16;
 237 }
 238
 239
 240 #if 1
 241     //wait for digest ready
 242     while (! hashs->controlr.DGRY) {
 243         // this will not take long
 244     }
 245 #endif
 246
 247     *((u32 *) out + 0) = hashs->D1R;
 248     *((u32 *) out + 1) = hashs->D2R;
 249     *((u32 *) out + 2) = hashs->D3R;
 250     *((u32 *) out + 3) = hashs->D4R;
 251     *((u32 *) out + 4) = hashs->D5R;
 252
 253     CRTCL_SECT_END;
 254 }
 255
 256 /*
 257  * \brief SHA1-HMAC function mappings
 258 */
 259
 260 struct crypto_alg ifxdeu_sha1_hmac_alg = {
 261         .cra_name       =       "hmac(sha1)",
 262         .cra_driver_name=       "ifxdeu-sha1_hmac",
 263         .cra_flags      =       CRYPTO_ALG_TYPE_DIGEST,
 264         .cra_blocksize  =       SHA1_HMAC_BLOCK_SIZE,
 265         .cra_ctxsize    =       sizeof(struct sha1_hmac_ctx),
 266         .cra_module   =         THIS_MODULE,
 267         .cra_alignmask  =       3,
 268         .cra_list       =       LIST_HEAD_INIT(ifxdeu_sha1_hmac_alg.cra_list),
 269         .cra_u          =       { .digest = {
 270         .dia_digestsize =       SHA1_DIGEST_SIZE,
 271         .dia_setkey     =       sha1_hmac_setkey,
 272         .dia_init       =       sha1_hmac_init,
 273         .dia_update     =       sha1_hmac_update,
 274         .dia_final      =       sha1_hmac_final } }
 275 };
 276
 277
 278 /*! \fn int __init ifxdeu_init_sha1_hmac (void)
 279  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 280  *  \brief initialize sha1 hmac driver
 281 */
 282 int __init ifxdeu_init_sha1_hmac (void)
 283 {
 284     int ret;
 285
 286     if ((ret = crypto_register_alg(&ifxdeu_sha1_hmac_alg)))
 287         goto sha1_err;
 288
 289     CRTCL_SECT_INIT;
 290
 291     printk (KERN_NOTICE "IFX DEU SHA1_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
 292     return ret;
 293
 294 sha1_err:
 295     printk(KERN_ERR "IFX DEU SHA1_HMAC initialization failed!\n");
 296     return ret;
 297 }
 298
 299 /*! \fn void __exit ifxdeu_fini_sha1_hmac (void)
 300  *  \ingroup IFX_SHA1_HMAC_FUNCTIONS
 301  *  \brief unregister sha1 hmac driver
 302 */
 303 void __exit ifxdeu_fini_sha1_hmac (void)
 304 {
 305     crypto_unregister_alg (&ifxdeu_sha1_hmac_alg);
 306 }
 307
 308 #endif