311 lines
8.8 KiB
C
311 lines
8.8 KiB
C
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/******************************************************************************
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**
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** FILE NAME : ifxmips_md5.c
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** PROJECT : IFX UEIP
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** MODULES : DEU Module for UEIP
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**
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** DATE : September 8, 2009
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** AUTHOR : Mohammad Firdaus
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** DESCRIPTION : Data Encryption Unit Driver
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** COPYRIGHT : Copyright (c) 2009
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** Infineon Technologies AG
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** Am Campeon 1-12, 85579 Neubiberg, Germany
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** HISTORY
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** $Date $Author $Comment
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** 08,Sept 2009 Mohammad Firdaus Initial UEIP release
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*******************************************************************************/
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/*!
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\defgroup IFX_DEU IFX_DEU_DRIVERS
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\ingroup API
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\brief ifx deu driver module
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*/
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/*!
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\file ifxmips_md5.c
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\ingroup IFX_DEU
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\brief MD5 encryption deu driver file
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*/
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/*!
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\defgroup IFX_MD5_FUNCTIONS IFX_MD5_FUNCTIONS
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\ingroup IFX_DEU
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\brief ifx deu MD5 functions
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*/
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/*Project header files */
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/crypto.h>
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#include <linux/types.h>
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#include <crypto/internal/hash.h>
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#include <asm/byteorder.h>
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/* Project header */
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#if defined(CONFIG_DANUBE)
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#include "ifxmips_deu_danube.h"
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#elif defined(CONFIG_AR9)
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#include "ifxmips_deu_ar9.h"
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#elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
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#include "ifxmips_deu_vr9.h"
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#else
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#error "Plaform Unknwon!"
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#endif
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#define MD5_DIGEST_SIZE 16
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#define MD5_HMAC_BLOCK_SIZE 64
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#define MD5_BLOCK_WORDS 16
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#define MD5_HASH_WORDS 4
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#define HASH_START IFX_HASH_CON
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static spinlock_t lock;
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#define CRTCL_SECT_INIT spin_lock_init(&lock)
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#define CRTCL_SECT_START spin_lock_irqsave(&lock, flag)
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#define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag)
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//#define CRYPTO_DEBUG
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#ifdef CRYPTO_DEBUG
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extern char debug_level;
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#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
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#else
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#define DPRINTF(level, format, args...)
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#endif
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struct md5_ctx {
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int started;
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u32 hash[MD5_HASH_WORDS];
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u32 block[MD5_BLOCK_WORDS];
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u64 byte_count;
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};
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extern int disable_deudma;
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/*! \fn static u32 endian_swap(u32 input)
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* \ingroup IFX_MD5_FUNCTIONS
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* \brief perform dword level endian swap
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* \param input value of dword that requires to be swapped
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*/
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static u32 endian_swap(u32 input)
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{
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u8 *ptr = (u8 *)&input;
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return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
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}
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/*! \fn static void md5_transform(u32 *hash, u32 const *in)
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* \ingroup IFX_MD5_FUNCTIONS
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* \brief main interface to md5 hardware
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* \param hash current hash value
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* \param in 64-byte block of input
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*/
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static void md5_transform(struct md5_ctx *mctx, u32 *hash, u32 const *in)
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{
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int i;
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volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
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unsigned long flag;
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CRTCL_SECT_START;
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if (mctx->started) {
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hashs->D1R = endian_swap(*((u32 *) hash + 0));
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hashs->D2R = endian_swap(*((u32 *) hash + 1));
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hashs->D3R = endian_swap(*((u32 *) hash + 2));
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hashs->D4R = endian_swap(*((u32 *) hash + 3));
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}
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for (i = 0; i < 16; i++) {
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hashs->MR = endian_swap(in[i]);
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// printk("in[%d]: %08x\n", i, endian_swap(in[i]));
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};
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//wait for processing
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while (hashs->controlr.BSY) {
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// this will not take long
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}
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*((u32 *) hash + 0) = endian_swap (hashs->D1R);
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*((u32 *) hash + 1) = endian_swap (hashs->D2R);
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*((u32 *) hash + 2) = endian_swap (hashs->D3R);
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*((u32 *) hash + 3) = endian_swap (hashs->D4R);
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mctx->started = 1;
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CRTCL_SECT_END;
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}
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/*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx)
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* \ingroup IFX_MD5_FUNCTIONS
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* \brief interfacing function for md5_transform()
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* \param ctx crypto context
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*/
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static inline void md5_transform_helper(struct md5_ctx *ctx)
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{
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//le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
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md5_transform(ctx, ctx->hash, ctx->block);
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}
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/*! \fn static void md5_init(struct crypto_tfm *tfm)
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* \ingroup IFX_MD5_FUNCTIONS
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* \brief initialize md5 hardware
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* \param tfm linux crypto algo transform
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*/
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static int md5_init(struct shash_desc *desc)
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{
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struct md5_ctx *mctx = shash_desc_ctx(desc);
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volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
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hash->controlr.ENDI = 0;
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hash->controlr.SM = 1;
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hash->controlr.ALGO = 1; // 1 = md5 0 = sha1
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hash->controlr.INIT = 1; // Initialize the hash operation by writing a '1' to the INIT bit.
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mctx->byte_count = 0;
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mctx->started = 0;
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return 0;
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}
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/*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
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* \ingroup IFX_MD5_FUNCTIONS
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* \brief on-the-fly md5 computation
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* \param tfm linux crypto algo transform
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* \param data input data
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* \param len size of input data
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*/
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static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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{
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struct md5_ctx *mctx = shash_desc_ctx(desc);
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const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
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mctx->byte_count += len;
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if (avail > len) {
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, len);
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return 0;
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}
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memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, avail);
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md5_transform_helper(mctx);
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data += avail;
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len -= avail;
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while (len >= sizeof(mctx->block)) {
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memcpy(mctx->block, data, sizeof(mctx->block));
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md5_transform_helper(mctx);
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data += sizeof(mctx->block);
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len -= sizeof(mctx->block);
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}
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memcpy(mctx->block, data, len);
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return 0;
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}
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/*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out)
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* \ingroup IFX_MD5_FUNCTIONS
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* \brief compute final md5 value
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* \param tfm linux crypto algo transform
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* \param out final md5 output value
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*/
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static int md5_final(struct shash_desc *desc, u8 *out)
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{
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struct md5_ctx *mctx = shash_desc_ctx(desc);
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const unsigned int offset = mctx->byte_count & 0x3f;
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char *p = (char *)mctx->block + offset;
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int padding = 56 - (offset + 1);
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volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
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unsigned long flag;
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*p++ = 0x80;
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if (padding < 0) {
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memset(p, 0x00, padding + sizeof (u64));
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md5_transform_helper(mctx);
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p = (char *)mctx->block;
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padding = 56;
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}
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memset(p, 0, padding);
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mctx->block[14] = endian_swap(mctx->byte_count << 3);
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mctx->block[15] = endian_swap(mctx->byte_count >> 29);
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#if 0
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le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
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sizeof(u64)) / sizeof(u32));
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#endif
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md5_transform(mctx, mctx->hash, mctx->block);
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CRTCL_SECT_START;
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*((u32 *) out + 0) = endian_swap (hashs->D1R);
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*((u32 *) out + 1) = endian_swap (hashs->D2R);
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*((u32 *) out + 2) = endian_swap (hashs->D3R);
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*((u32 *) out + 3) = endian_swap (hashs->D4R);
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CRTCL_SECT_END;
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// Wipe context
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memset(mctx, 0, sizeof(*mctx));
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return 0;
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}
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/*
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* \brief MD5 function mappings
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*/
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static struct shash_alg ifxdeu_md5_alg = {
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.digestsize = MD5_DIGEST_SIZE,
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.init = md5_init,
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.update = md5_update,
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.final = md5_final,
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.descsize = sizeof(struct md5_ctx),
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.base = {
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.cra_name = "md5",
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.cra_driver_name= "ifxdeu-md5",
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
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.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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}
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};
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/*! \fn int __init ifxdeu_init_md5 (void)
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* \ingroup IFX_MD5_FUNCTIONS
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* \brief initialize md5 driver
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*/
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int __init ifxdeu_init_md5 (void)
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{
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int ret = -ENOSYS;
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if ((ret = crypto_register_shash(&ifxdeu_md5_alg)))
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goto md5_err;
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CRTCL_SECT_INIT;
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printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
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return ret;
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md5_err:
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printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
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return ret;
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}
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/*! \fn void __exit ifxdeu_fini_md5 (void)
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* \ingroup IFX_MD5_FUNCTIONS
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* \brief unregister md5 driver
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*/
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void __exit ifxdeu_fini_md5 (void)
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{
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crypto_unregister_shash(&ifxdeu_md5_alg);
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}
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