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/******************************************************************************
**
** FILE NAME : ifxmips_md5_hmac.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
** 21,March 2011 Mohammad Firdaus Changes for Kernel 2.6.32 and IPSec integration
*******************************************************************************/
/*!
\defgroup IFX_DEU IFX_DEU_DRIVERS
\ingroup API
\brief ifx deu driver module
*/
/*!
\file ifxmips_md5_hmac.c
\ingroup IFX_DEU
\brief MD5-HMAC encryption deu driver file
*/
/*!
\defgroup IFX_MD5_HMAC_FUNCTIONS IFX_MD5_HMAC_FUNCTIONS
\ingroup IFX_DEU
\brief ifx md5-hmac driver 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>
#if 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 MD5_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround
#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
#define MAX_HASH_KEYLEN 64
struct md5_hmac_ctx {
u8 key[MAX_HASH_KEYLEN];
u32 hash[MD5_HASH_WORDS];
u32 block[MD5_BLOCK_WORDS];
u64 byte_count;
u32 dbn;
unsigned int keylen;
};
static u32 temp[MD5_HMAC_DBN_TEMP_SIZE];
extern int disable_deudma;
/*! \fn static u32 endian_swap(u32 input)
* \ingroup IFX_MD5_HMAC_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_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
* \ingroup IFX_MD5_HMAC_FUNCTIONS
* \brief save input block to context
* \param tfm linux crypto algo transform
* \param in 64-byte block of input
*/
static void md5_hmac_transform(struct shash_desc *desc, u32 const *in)
{
struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
memcpy(&temp[mctx->dbn<<4], in, 64); //dbn workaround
mctx->dbn += 1;
if ( (mctx->dbn<<4) > MD5_HMAC_DBN_TEMP_SIZE )
{
printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n");
}
}
/*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
* \ingroup IFX_MD5_HMAC_FUNCTIONS
* \brief sets md5 hmac key
* \param tfm linux crypto algo transform
* \param key input key
* \param keylen key length greater than 64 bytes IS NOT SUPPORTED
*/
static int md5_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
{
struct md5_hmac_ctx *mctx = crypto_shash_ctx(tfm);
volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
//printk("copying keys to context with length %d\n", keylen);
if (keylen > MAX_HASH_KEYLEN) {
printk("Key length more than what DEU hash can handle\n");
return -EINVAL;
}
hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0'
memcpy(&mctx->key, key, keylen);
mctx->keylen = keylen;
return 0;
}
/*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
* \ingroup IFX_MD5_HMAC_FUNCTIONS
* \brief sets md5 hmac key into the hardware registers
* \param key input key
* \param keylen key length greater than 64 bytes IS NOT SUPPORTED
*/
static int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
{
volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
unsigned long flag;
int i, j;
u32 *in_key = (u32 *)key;
//printk("\nsetkey keylen: %d\n key: ", keylen);
CRTCL_SECT_START;
j = 0;
for (i = 0; i < keylen; i+=4)
{
hash->KIDX = j;
asm("sync");
hash->KEY = *((u32 *) in_key + j);
asm("sync");
j++;
}
CRTCL_SECT_END;
return 0;
}
/*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
* \ingroup IFX_MD5_HMAC_FUNCTIONS
* \brief initialize md5 hmac context
* \param tfm linux crypto algo transform
*/
static int md5_hmac_init(struct shash_desc *desc)
{
struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
mctx->dbn = 0; //dbn workaround
md5_hmac_setkey_hw(mctx->key, mctx->keylen);
return 0;
}
EXPORT_SYMBOL(md5_hmac_init);
/*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
* \ingroup IFX_MD5_HMAC_FUNCTIONS
* \brief on-the-fly md5 hmac computation
* \param tfm linux crypto algo transform
* \param data input data
* \param len size of input data
*/
static int md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len)
{
struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
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_hmac_transform(desc, mctx->block);
data += avail;
len -= avail;
while (len >= sizeof(mctx->block)) {
memcpy(mctx->block, data, sizeof(mctx->block));
md5_hmac_transform(desc, mctx->block);
data += sizeof(mctx->block);
len -= sizeof(mctx->block);
}
memcpy(mctx->block, data, len);
return 0;
}
EXPORT_SYMBOL(md5_hmac_update);
/*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
* \ingroup IFX_MD5_HMAC_FUNCTIONS
* \brief compute final md5 hmac value
* \param tfm linux crypto algo transform
* \param out final md5 hmac output value
*/
static int md5_hmac_final(struct shash_desc *desc, u8 *out)
{
struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
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;
int i = 0;
int dbn;
u32 *in = &temp[0];
*p++ = 0x80;
if (padding < 0) {
memset(p, 0x00, padding + sizeof (u64));
md5_hmac_transform(desc, mctx->block);
p = (char *)mctx->block;
padding = 56;
}
memset(p, 0, padding);
mctx->block[14] = endian_swap((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
mctx->block[15] = 0x00000000;
md5_hmac_transform(desc, mctx->block);
CRTCL_SECT_START;
//printk("\ndbn = %d\n", mctx->dbn);
hashs->DBN = mctx->dbn;
asm("sync");
*IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
//wait for processing
while (hashs->controlr.BSY) {
// this will not take long
}
for (dbn = 0; dbn < mctx->dbn; dbn++)
{
for (i = 0; i < 16; i++) {
hashs->MR = in[i];
};
hashs->controlr.GO = 1;
asm("sync");
//wait for processing
while (hashs->controlr.BSY) {
// this will not take long
}
in += 16;
}
#if 1
//wait for digest ready
while (! hashs->controlr.DGRY) {
// this will not take long
}
#endif
*((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;
/* reset the context after we finish with the hash */
mctx->byte_count = 0;
memset(&mctx->hash[0], 0, sizeof(MD5_HASH_WORDS));
memset(&mctx->block[0], 0, sizeof(MD5_BLOCK_WORDS));
memset(&temp[0], 0, MD5_HMAC_DBN_TEMP_SIZE);
CRTCL_SECT_END;
return 0;
}
EXPORT_SYMBOL(md5_hmac_final);
/*
* \brief MD5_HMAC function mappings
*/
static struct shash_alg ifxdeu_md5_hmac_alg = {
.digestsize = MD5_DIGEST_SIZE,
.init = md5_hmac_init,
.update = md5_hmac_update,
.final = md5_hmac_final,
.setkey = md5_hmac_setkey,
.descsize = sizeof(struct md5_hmac_ctx),
.base = {
.cra_name = "hmac(md5)",
.cra_driver_name= "ifxdeu-md5_hmac",
.cra_priority = 400,
.cra_ctxsize = sizeof(struct md5_hmac_ctx),
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
.cra_module = THIS_MODULE,
}
};
/*! \fn int ifxdeu_init_md5_hmac (void)
* \ingroup IFX_MD5_HMAC_FUNCTIONS
* \brief initialize md5 hmac driver
*/
int ifxdeu_init_md5_hmac (void)
{
int ret = -ENOSYS;
if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg)))
goto md5_hmac_err;
CRTCL_SECT_INIT;
printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
return ret;
md5_hmac_err:
printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
return ret;
}
/** \fn void ifxdeu_fini_md5_hmac (void)
* \ingroup IFX_MD5_HMAC_FUNCTIONS
* \brief unregister md5 hmac driver
*/
void ifxdeu_fini_md5_hmac (void)
{
crypto_unregister_shash(&ifxdeu_md5_hmac_alg);
}