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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_flags = CRYPTO_ALG_TYPE_DIGEST,
- .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
- .cra_module = THIS_MODULE,
- }
-};
-
-/*! \fn int __init ifxdeu_init_md5 (void)
- * \ingroup IFX_MD5_FUNCTIONS
- * \brief initialize md5 driver
-*/
-int __init 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 __exit ifxdeu_fini_md5 (void)
- * \ingroup IFX_MD5_FUNCTIONS
- * \brief unregister md5 driver
-*/
-
-void __exit ifxdeu_fini_md5 (void)
-{
- crypto_unregister_shash(&ifxdeu_md5_alg);
-
-}
-