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/******************************************************************************
**
** FILE NAME : ifxmips_sha1.c
** PROJECT : IFX UEIP
** MODULES : DEU Module for Danube
**
** DATE : September 8, 2009
** AUTHOR : Mohammad Firdaus
** DESCRIPTION : Data Encryption Unit Driver
** COPYRIGHT : Copyright (c) 2009
** Infineon Technologies AG
** Am Campeon 1-12, 85579 Neubiberg, Germany
**
** 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.
**
** HISTORY
** $Date $Author $Comment
** 08,Sept 2009 Mohammad Firdaus Initial UEIP release
*******************************************************************************/
/*!
\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 <crypto/sha.h>
#include <crypto/internal/hash.h>
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <asm/byteorder.h>
#if defined(CONFIG_DANUBE)
#include "ifxmips_deu_danube.h"
#elif defined(CONFIG_AR9)
#include "ifxmips_deu_ar9.h"
#elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
#include "ifxmips_deu_vr9.h"
#else
#error "Plaform Unknwon!"
#endif
#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)
//#define CRYPTO_DEBUG
#ifdef CRYPTO_DEBUG
extern char debug_level;
#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
#else
#define DPRINTF(level, format, args...)
#endif
/*
* \brief SHA1 private structure
*/
struct sha1_ctx {
int started;
u64 count;
u32 hash[5];
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 (struct sha1_ctx *sctx, u32 *state, const u32 *in)
{
int i = 0;
volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
unsigned long flag;
CRTCL_SECT_START;
/* For context switching purposes, the previous hash output
* is loaded back into the output register
*/
if (sctx->started) {
hashs->D1R = *((u32 *) sctx->hash + 0);
hashs->D2R = *((u32 *) sctx->hash + 1);
hashs->D3R = *((u32 *) sctx->hash + 2);
hashs->D4R = *((u32 *) sctx->hash + 3);
hashs->D5R = *((u32 *) sctx->hash + 4);
}
for (i = 0; i < 16; i++) {
hashs->MR = in[i];
};
//wait for processing
while (hashs->controlr.BSY) {
// this will not take long
}
/* For context switching purposes, the output is saved into a
* context struct which can be used later on
*/
*((u32 *) sctx->hash + 0) = hashs->D1R;
*((u32 *) sctx->hash + 1) = hashs->D2R;
*((u32 *) sctx->hash + 2) = hashs->D3R;
*((u32 *) sctx->hash + 3) = hashs->D4R;
*((u32 *) sctx->hash + 4) = hashs->D5R;
sctx->started = 1;
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 int sha1_init(struct shash_desc *desc)
{
struct sha1_ctx *sctx = shash_desc_ctx(desc);
SHA_HASH_INIT;
sctx->started = 0;
sctx->count = 0;
return 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 int sha1_update(struct shash_desc * desc, const u8 *data,
unsigned int len)
{
struct sha1_ctx *sctx = shash_desc_ctx(desc);
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, sctx->state, (const u32 *)sctx->buffer);
for (; i + 63 < len; i += 64) {
sha1_transform (sctx, sctx->state, (const u32 *)&data[i]);
}
j = 0;
}
else
i = 0;
memcpy (&sctx->buffer[j], &data[i], len - i);
return 0;
}
/*! \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 int sha1_final(struct shash_desc *desc, u8 *out)
{
struct sha1_ctx *sctx = shash_desc_ctx(desc);
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;
unsigned long 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 (desc, padding, padlen);
/* Append length */
sha1_update (desc, 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);
return 0;
}
/*
* \brief SHA1 function mappings
*/
static struct shash_alg ifxdeu_sha1_alg = {
.digestsize = SHA1_DIGEST_SIZE,
.init = sha1_init,
.update = sha1_update,
.final = sha1_final,
.descsize = sizeof(struct sha1_ctx),
.statesize = sizeof(struct sha1_state),
.base = {
.cra_name = "sha1",
.cra_driver_name= "ifxdeu-sha1",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
.cra_blocksize = SHA1_HMAC_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
/*! \fn int ifxdeu_init_sha1 (void)
* \ingroup IFX_SHA1_FUNCTIONS
* \brief initialize sha1 driver
*/
int ifxdeu_init_sha1 (void)
{
int ret = -ENOSYS;
if ((ret = crypto_register_shash(&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 ifxdeu_fini_sha1 (void)
* \ingroup IFX_SHA1_FUNCTIONS
* \brief unregister sha1 driver
*/
void ifxdeu_fini_sha1 (void)
{
crypto_unregister_shash(&ifxdeu_sha1_alg);
}