302 lines
7.9 KiB
C
302 lines
7.9 KiB
C
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/******************************************************************************
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**
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** FILE NAME : ifxmips_sha1.c
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** PROJECT : IFX UEIP
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** MODULES : DEU Module for Danube
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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_sha1.c
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\ingroup IFX_DEU
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\brief SHA1 encryption deu driver file
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*/
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/*!
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\defgroup IFX_SHA1_FUNCTIONS IFX_SHA1_FUNCTIONS
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\ingroup IFX_DEU
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\brief ifx deu sha1 functions
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*/
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/* Project header */
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/crypto.h>
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#include <linux/cryptohash.h>
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#include <crypto/sha.h>
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#include <crypto/internal/hash.h>
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#include <linux/types.h>
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#include <asm/scatterlist.h>
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#include <asm/byteorder.h>
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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 SHA1_DIGEST_SIZE 20
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#define SHA1_HMAC_BLOCK_SIZE 64
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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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/*
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* \brief SHA1 private structure
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*/
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struct sha1_ctx {
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int started;
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u64 count;
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u32 hash[5];
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u32 state[5];
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u8 buffer[64];
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};
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extern int disable_deudma;
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/*! \fn static void sha1_transform (u32 *state, const u32 *in)
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* \ingroup IFX_SHA1_FUNCTIONS
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* \brief main interface to sha1 hardware
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* \param state current state
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* \param in 64-byte block of input
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*/
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static void sha1_transform (struct sha1_ctx *sctx, u32 *state, const u32 *in)
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{
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int i = 0;
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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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/* For context switching purposes, the previous hash output
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* is loaded back into the output register
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*/
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if (sctx->started) {
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hashs->D1R = *((u32 *) sctx->hash + 0);
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hashs->D2R = *((u32 *) sctx->hash + 1);
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hashs->D3R = *((u32 *) sctx->hash + 2);
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hashs->D4R = *((u32 *) sctx->hash + 3);
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hashs->D5R = *((u32 *) sctx->hash + 4);
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}
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for (i = 0; i < 16; i++) {
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hashs->MR = 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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/* For context switching purposes, the output is saved into a
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* context struct which can be used later on
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*/
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*((u32 *) sctx->hash + 0) = hashs->D1R;
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*((u32 *) sctx->hash + 1) = hashs->D2R;
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*((u32 *) sctx->hash + 2) = hashs->D3R;
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*((u32 *) sctx->hash + 3) = hashs->D4R;
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*((u32 *) sctx->hash + 4) = hashs->D5R;
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sctx->started = 1;
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CRTCL_SECT_END;
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}
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/*! \fn static void sha1_init(struct crypto_tfm *tfm)
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* \ingroup IFX_SHA1_FUNCTIONS
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* \brief initialize sha1 hardware
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* \param tfm linux crypto algo transform
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*/
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static int sha1_init(struct shash_desc *desc)
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{
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struct sha1_ctx *sctx = shash_desc_ctx(desc);
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SHA_HASH_INIT;
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sctx->started = 0;
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sctx->count = 0;
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return 0;
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}
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/*! \fn static void sha1_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
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* \ingroup IFX_SHA1_FUNCTIONS
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* \brief on-the-fly sha1 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 sha1_update(struct shash_desc * desc, const u8 *data,
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unsigned int len)
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{
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struct sha1_ctx *sctx = shash_desc_ctx(desc);
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unsigned int i, j;
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j = (sctx->count >> 3) & 0x3f;
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sctx->count += len << 3;
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if ((j + len) > 63) {
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memcpy (&sctx->buffer[j], data, (i = 64 - j));
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sha1_transform (sctx, sctx->state, (const u32 *)sctx->buffer);
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for (; i + 63 < len; i += 64) {
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sha1_transform (sctx, sctx->state, (const u32 *)&data[i]);
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}
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j = 0;
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}
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else
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i = 0;
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memcpy (&sctx->buffer[j], &data[i], len - i);
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return 0;
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}
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/*! \fn static void sha1_final(struct crypto_tfm *tfm, u8 *out)
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* \ingroup IFX_SHA1_FUNCTIONS
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* \brief compute final sha1 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 sha1_final(struct shash_desc *desc, u8 *out)
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{
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struct sha1_ctx *sctx = shash_desc_ctx(desc);
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u32 index, padlen;
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u64 t;
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u8 bits[8] = { 0, };
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static const u8 padding[64] = { 0x80, };
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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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t = sctx->count;
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bits[7] = 0xff & t;
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t >>= 8;
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bits[6] = 0xff & t;
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t >>= 8;
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bits[5] = 0xff & t;
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t >>= 8;
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bits[4] = 0xff & t;
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t >>= 8;
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bits[3] = 0xff & t;
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t >>= 8;
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bits[2] = 0xff & t;
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t >>= 8;
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bits[1] = 0xff & t;
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t >>= 8;
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bits[0] = 0xff & t;
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/* Pad out to 56 mod 64 */
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index = (sctx->count >> 3) & 0x3f;
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padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
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sha1_update (desc, padding, padlen);
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/* Append length */
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sha1_update (desc, bits, sizeof bits);
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CRTCL_SECT_START;
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*((u32 *) out + 0) = hashs->D1R;
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*((u32 *) out + 1) = hashs->D2R;
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*((u32 *) out + 2) = hashs->D3R;
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*((u32 *) out + 3) = hashs->D4R;
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*((u32 *) out + 4) = hashs->D5R;
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CRTCL_SECT_END;
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// Wipe context
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memset (sctx, 0, sizeof *sctx);
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return 0;
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}
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/*
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* \brief SHA1 function mappings
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*/
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static struct shash_alg ifxdeu_sha1_alg = {
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.digestsize = SHA1_DIGEST_SIZE,
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.init = sha1_init,
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.update = sha1_update,
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.final = sha1_final,
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.descsize = sizeof(struct sha1_ctx),
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.statesize = sizeof(struct sha1_state),
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.base = {
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.cra_name = "sha1",
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.cra_driver_name= "ifxdeu-sha1",
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.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
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.cra_blocksize = SHA1_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_sha1 (void)
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* \ingroup IFX_SHA1_FUNCTIONS
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* \brief initialize sha1 driver
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*/
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int __init ifxdeu_init_sha1 (void)
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{
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int ret = -ENOSYS;
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if ((ret = crypto_register_shash(&ifxdeu_sha1_alg)))
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goto sha1_err;
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CRTCL_SECT_INIT;
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printk (KERN_NOTICE "IFX DEU SHA1 initialized%s.\n", disable_deudma ? "" : " (DMA)");
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return ret;
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sha1_err:
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printk(KERN_ERR "IFX DEU SHA1 initialization failed!\n");
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return ret;
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}
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/*! \fn void __exit ifxdeu_fini_sha1 (void)
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* \ingroup IFX_SHA1_FUNCTIONS
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* \brief unregister sha1 driver
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*/
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void __exit ifxdeu_fini_sha1 (void)
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{
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crypto_unregister_shash(&ifxdeu_sha1_alg);
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}
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