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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* Copyright (C) 2010 Ralph Hempel <ralph.hempel@lantiq.com>
* Copyright (C) 2009 Mohammad Firdaus
*/
/*!
\defgroup IFX_DEU IFX_DEU_DRIVERS
\ingroup API
\brief ifx deu driver module
*/
/*!
\file ifxmips_sha1.c
\ingroup IFX_DEU
\brief SHA1 encryption deu driver file
*/
/*!
\defgroup IFX_SHA1_FUNCTIONS IFX_SHA1_FUNCTIONS
\ingroup IFX_DEU
\brief ifx deu sha1 functions
*/
/* Project header */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/crypto.h>
#include <linux/cryptohash.h>
#include <linux/types.h>
#include <asm/scatterlist.h>
#include <asm/byteorder.h>
#include "ifxmips_deu.h"
#define SHA1_DIGEST_SIZE 20
#define SHA1_HMAC_BLOCK_SIZE 64
#define HASH_START IFX_HASH_CON
static spinlock_t lock;
#define CRTCL_SECT_INIT spin_lock_init(&lock)
#define CRTCL_SECT_START spin_lock_irqsave(&lock, flag)
#define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag)
/*
* \brief SHA1 private structure
*/
struct sha1_ctx {
u64 count;
u32 state[5];
u8 buffer[64];
};
extern int disable_deudma;
/*! \fn static void sha1_transform (u32 *state, const u32 *in)
* \ingroup IFX_SHA1_FUNCTIONS
* \brief main interface to sha1 hardware
* \param state current state
* \param in 64-byte block of input
*/
static void sha1_transform (u32 *state, const u32 *in)
{
int i = 0;
volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
u32 flag;
CRTCL_SECT_START;
for (i = 0; i < 16; i++) {
hashs->MR = in[i];
};
//wait for processing
while (hashs->controlr.BSY) {
// this will not take long
}
CRTCL_SECT_END;
}
/*! \fn static void sha1_init(struct crypto_tfm *tfm)
* \ingroup IFX_SHA1_FUNCTIONS
* \brief initialize sha1 hardware
* \param tfm linux crypto algo transform
*/
static void sha1_init(struct crypto_tfm *tfm)
{
struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
SHA_HASH_INIT;
sctx->count = 0;
}
/*! \fn static void sha1_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
* \ingroup IFX_SHA1_FUNCTIONS
* \brief on-the-fly sha1 computation
* \param tfm linux crypto algo transform
* \param data input data
* \param len size of input data
*/
static void sha1_update(struct crypto_tfm *tfm, const u8 *data,
unsigned int len)
{
struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
unsigned int i, j;
j = (sctx->count >> 3) & 0x3f;
sctx->count += len << 3;
if ((j + len) > 63) {
memcpy (&sctx->buffer[j], data, (i = 64 - j));
sha1_transform (sctx->state, (const u32 *)sctx->buffer);
for (; i + 63 < len; i += 64) {
sha1_transform (sctx->state, (const u32 *)&data[i]);
}
j = 0;
}
else
i = 0;
memcpy (&sctx->buffer[j], &data[i], len - i);
}
/*! \fn static void sha1_final(struct crypto_tfm *tfm, u8 *out)
* \ingroup IFX_SHA1_FUNCTIONS
* \brief compute final sha1 value
* \param tfm linux crypto algo transform
* \param out final md5 output value
*/
static void sha1_final(struct crypto_tfm *tfm, u8 *out)
{
struct sha1_ctx *sctx = crypto_tfm_ctx(tfm);
u32 index, padlen;
u64 t;
u8 bits[8] = { 0, };
static const u8 padding[64] = { 0x80, };
volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
ulong flag;
t = sctx->count;
bits[7] = 0xff & t;
t >>= 8;
bits[6] = 0xff & t;
t >>= 8;
bits[5] = 0xff & t;
t >>= 8;
bits[4] = 0xff & t;
t >>= 8;
bits[3] = 0xff & t;
t >>= 8;
bits[2] = 0xff & t;
t >>= 8;
bits[1] = 0xff & t;
t >>= 8;
bits[0] = 0xff & t;
/* Pad out to 56 mod 64 */
index = (sctx->count >> 3) & 0x3f;
padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
sha1_update (tfm, padding, padlen);
/* Append length */
sha1_update (tfm, bits, sizeof bits);
CRTCL_SECT_START;
*((u32 *) out + 0) = hashs->D1R;
*((u32 *) out + 1) = hashs->D2R;
*((u32 *) out + 2) = hashs->D3R;
*((u32 *) out + 3) = hashs->D4R;
*((u32 *) out + 4) = hashs->D5R;
CRTCL_SECT_END;
// Wipe context
memset (sctx, 0, sizeof *sctx);
}
/*
* \brief SHA1 function mappings
*/
struct crypto_alg ifxdeu_sha1_alg = {
.cra_name = "sha1",
.cra_driver_name= "ifxdeu-sha1",
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
.cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
.cra_ctxsize = sizeof(struct sha1_ctx),
.cra_module = THIS_MODULE,
.cra_alignmask = 3,
.cra_list = LIST_HEAD_INIT(ifxdeu_sha1_alg.cra_list),
.cra_u = { .digest = {
.dia_digestsize = SHA1_DIGEST_SIZE,
.dia_init = sha1_init,
.dia_update = sha1_update,
.dia_final = sha1_final } }
};
/*! \fn int __init ifxdeu_init_sha1 (void)
* \ingroup IFX_SHA1_FUNCTIONS
* \brief initialize sha1 driver
*/
int __init ifxdeu_init_sha1 (void)
{
int ret;
if ((ret = crypto_register_alg(&ifxdeu_sha1_alg)))
goto sha1_err;
CRTCL_SECT_INIT;
printk (KERN_NOTICE "IFX DEU SHA1 initialized%s.\n", disable_deudma ? "" : " (DMA)");
return ret;
sha1_err:
printk(KERN_ERR "IFX DEU SHA1 initialization failed!\n");
return ret;
}
/*! \fn void __exit ifxdeu_fini_sha1 (void)
* \ingroup IFX_SHA1_FUNCTIONS
* \brief unregister sha1 driver
*/
void __exit ifxdeu_fini_sha1 (void)
{
crypto_unregister_alg (&ifxdeu_sha1_alg);
}
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