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/******************************************************************************
**
** FILE NAME : ifxmips_md5.c
** PROJECT : IFX UEIP
** MODULES : DEU Module for UEIP
**
** 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_md5.c
\ingroup IFX_DEU
\brief MD5 encryption deu driver file
*/
/*!
\defgroup IFX_MD5_FUNCTIONS IFX_MD5_FUNCTIONS
\ingroup IFX_DEU
\brief ifx deu MD5 functions
*/
/*Project header files */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/crypto.h>
#include <linux/types.h>
#include <crypto/internal/hash.h>
#include <asm/byteorder.h>
/* Project header */
#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 MD5_DIGEST_SIZE 16
#define MD5_HMAC_BLOCK_SIZE 64
#define MD5_BLOCK_WORDS 16
#define MD5_HASH_WORDS 4
#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
struct md5_ctx {
int started;
u32 hash[MD5_HASH_WORDS];
u32 block[MD5_BLOCK_WORDS];
u64 byte_count;
};
extern int disable_deudma;
/*! \fn static u32 endian_swap(u32 input)
* \ingroup IFX_MD5_FUNCTIONS
* \brief perform dword level endian swap
* \param input value of dword that requires to be swapped
*/
static u32 endian_swap(u32 input)
{
u8 *ptr = (u8 *)&input;
return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
}
/*! \fn static void md5_transform(u32 *hash, u32 const *in)
* \ingroup IFX_MD5_FUNCTIONS
* \brief main interface to md5 hardware
* \param hash current hash value
* \param in 64-byte block of input
*/
static void md5_transform(struct md5_ctx *mctx, u32 *hash, u32 const *in)
{
int i;
volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
unsigned long flag;
CRTCL_SECT_START;
if (mctx->started) {
hashs->D1R = endian_swap(*((u32 *) hash + 0));
hashs->D2R = endian_swap(*((u32 *) hash + 1));
hashs->D3R = endian_swap(*((u32 *) hash + 2));
hashs->D4R = endian_swap(*((u32 *) hash + 3));
}
for (i = 0; i < 16; i++) {
hashs->MR = endian_swap(in[i]);
// printk("in[%d]: %08x\n", i, endian_swap(in[i]));
};
//wait for processing
while (hashs->controlr.BSY) {
// this will not take long
}
*((u32 *) hash + 0) = endian_swap (hashs->D1R);
*((u32 *) hash + 1) = endian_swap (hashs->D2R);
*((u32 *) hash + 2) = endian_swap (hashs->D3R);
*((u32 *) hash + 3) = endian_swap (hashs->D4R);
mctx->started = 1;
CRTCL_SECT_END;
}
/*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx)
* \ingroup IFX_MD5_FUNCTIONS
* \brief interfacing function for md5_transform()
* \param ctx crypto context
*/
static inline void md5_transform_helper(struct md5_ctx *ctx)
{
//le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
md5_transform(ctx, ctx->hash, ctx->block);
}
/*! \fn static void md5_init(struct crypto_tfm *tfm)
* \ingroup IFX_MD5_FUNCTIONS
* \brief initialize md5 hardware
* \param tfm linux crypto algo transform
*/
static int md5_init(struct shash_desc *desc)
{
struct md5_ctx *mctx = shash_desc_ctx(desc);
volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
hash->controlr.ENDI = 0;
hash->controlr.SM = 1;
hash->controlr.ALGO = 1; // 1 = md5 0 = sha1
hash->controlr.INIT = 1; // Initialize the hash operation by writing a '1' to the INIT bit.
mctx->byte_count = 0;
mctx->started = 0;
return 0;
}
/*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
* \ingroup IFX_MD5_FUNCTIONS
* \brief on-the-fly md5 computation
* \param tfm linux crypto algo transform
* \param data input data
* \param len size of input data
*/
static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
{
struct md5_ctx *mctx = shash_desc_ctx(desc);
const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
mctx->byte_count += len;
if (avail > len) {
memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
data, len);
return 0;
}
memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
data, avail);
md5_transform_helper(mctx);
data += avail;
len -= avail;
while (len >= sizeof(mctx->block)) {
memcpy(mctx->block, data, sizeof(mctx->block));
md5_transform_helper(mctx);
data += sizeof(mctx->block);
len -= sizeof(mctx->block);
}
memcpy(mctx->block, data, len);
return 0;
}
/*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out)
* \ingroup IFX_MD5_FUNCTIONS
* \brief compute final md5 value
* \param tfm linux crypto algo transform
* \param out final md5 output value
*/
static int md5_final(struct shash_desc *desc, u8 *out)
{
struct md5_ctx *mctx = shash_desc_ctx(desc);
const unsigned int offset = mctx->byte_count & 0x3f;
char *p = (char *)mctx->block + offset;
int padding = 56 - (offset + 1);
volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
unsigned long flag;
*p++ = 0x80;
if (padding < 0) {
memset(p, 0x00, padding + sizeof (u64));
md5_transform_helper(mctx);
p = (char *)mctx->block;
padding = 56;
}
memset(p, 0, padding);
mctx->block[14] = endian_swap(mctx->byte_count << 3);
mctx->block[15] = endian_swap(mctx->byte_count >> 29);
#if 0
le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
sizeof(u64)) / sizeof(u32));
#endif
md5_transform(mctx, mctx->hash, mctx->block);
CRTCL_SECT_START;
*((u32 *) out + 0) = endian_swap (hashs->D1R);
*((u32 *) out + 1) = endian_swap (hashs->D2R);
*((u32 *) out + 2) = endian_swap (hashs->D3R);
*((u32 *) out + 3) = endian_swap (hashs->D4R);
CRTCL_SECT_END;
// Wipe context
memset(mctx, 0, sizeof(*mctx));
return 0;
}
/*
* \brief MD5 function mappings
*/
static struct shash_alg ifxdeu_md5_alg = {
.digestsize = MD5_DIGEST_SIZE,
.init = md5_init,
.update = md5_update,
.final = md5_final,
.descsize = sizeof(struct md5_ctx),
.base = {
.cra_name = "md5",
.cra_driver_name= "ifxdeu-md5",
.cra_priority = 300,
.cra_flags = CRYPTO_ALG_TYPE_HASH,
.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
/*! \fn int ifxdeu_init_md5 (void)
* \ingroup IFX_MD5_FUNCTIONS
* \brief initialize md5 driver
*/
int ifxdeu_init_md5 (void)
{
int ret = -ENOSYS;
if ((ret = crypto_register_shash(&ifxdeu_md5_alg)))
goto md5_err;
CRTCL_SECT_INIT;
printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
return ret;
md5_err:
printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
return ret;
}
/*! \fn void ifxdeu_fini_md5 (void)
* \ingroup IFX_MD5_FUNCTIONS
* \brief unregister md5 driver
*/
void ifxdeu_fini_md5 (void)
{
crypto_unregister_shash(&ifxdeu_md5_alg);
}
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