378 lines
10 KiB
C
378 lines
10 KiB
C
/******************************************************************************
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**
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** FILE NAME : ifxmips_sha1_hmac.c
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** PROJECT : IFX UEIP
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** MODULES : DEU Module for UEIP
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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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** 21,March 2011 Mohammad Firdaus Changes for Kernel 2.6.32 and IPSec integration
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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_hmac.c
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\ingroup IFX_DEU
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\brief SHA1-HMAC deu driver file
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*/
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/*!
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\defgroup IFX_SHA1_HMAC_FUNCTIONS IFX_SHA1_HMAC_FUNCTIONS
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\ingroup IFX_DEU
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\brief ifx sha1 hmac 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/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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#include <linux/delay.h>
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#if 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 SHA1_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround
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#define HASH_START IFX_HASH_CON
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#define SHA1_HMAC_MAX_KEYLEN 64
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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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#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 sha1_hmac_ctx {
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int keylen;
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u8 buffer[SHA1_HMAC_BLOCK_SIZE];
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u8 key[SHA1_HMAC_MAX_KEYLEN];
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u32 state[5];
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u32 dbn;
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u64 count;
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};
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static u32 temp[SHA1_HMAC_DBN_TEMP_SIZE];
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extern int disable_deudma;
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/*! \fn static void sha1_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
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* \ingroup IFX_SHA1_HMAC_FUNCTIONS
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* \brief save input block to context
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* \param tfm linux crypto algo transform
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* \param in 64-byte block of input
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*/
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static int sha1_hmac_transform(struct shash_desc *desc, u32 const *in)
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{
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struct sha1_hmac_ctx *sctx = crypto_shash_ctx(desc->tfm);
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memcpy(&temp[sctx->dbn<<4], in, 64); //dbn workaround
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sctx->dbn += 1;
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if ( (sctx->dbn<<4) > SHA1_HMAC_DBN_TEMP_SIZE )
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{
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printk("SHA1_HMAC_DBN_TEMP_SIZE exceeded\n");
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}
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return 0;
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}
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/*! \fn int sha1_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
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* \ingroup IFX_SHA1_HMAC_FUNCTIONS
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* \brief sets sha1 hmac key
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* \param tfm linux crypto algo transform
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* \param key input key
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* \param keylen key length greater than 64 bytes IS NOT SUPPORTED
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*/
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static int sha1_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
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{
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struct sha1_hmac_ctx *sctx = crypto_shash_ctx(tfm);
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volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
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if (keylen > SHA1_HMAC_MAX_KEYLEN) {
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printk("Key length exceeds maximum key length\n");
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return -EINVAL;
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}
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//printk("Setting keys of len: %d\n", keylen);
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hashs->KIDX |= 0x80000000; //reset keys back to 0
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memcpy(&sctx->key, key, keylen);
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sctx->keylen = keylen;
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return 0;
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}
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/*! \fn int sha1_hmac_setkey_hw(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
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* \ingroup IFX_SHA1_HMAC_FUNCTIONS
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* \brief sets sha1 hmac key into hw registers
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* \param tfm linux crypto algo transform
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* \param key input key
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* \param keylen key length greater than 64 bytes IS NOT SUPPORTED
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*/
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static int sha1_hmac_setkey_hw(const u8 *key, unsigned int keylen)
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{
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volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
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int i, j;
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unsigned long flag;
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u32 *in_key = (u32 *)key;
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j = 0;
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CRTCL_SECT_START;
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for (i = 0; i < keylen; i+=4)
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{
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hash->KIDX = j;
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asm("sync");
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hash->KEY = *((u32 *) in_key + j);
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j++;
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}
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CRTCL_SECT_END;
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return 0;
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}
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/*! \fn void sha1_hmac_init(struct crypto_tfm *tfm)
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* \ingroup IFX_SHA1_HMAC_FUNCTIONS
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* \brief initialize sha1 hmac context
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* \param tfm linux crypto algo transform
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*/
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static int sha1_hmac_init(struct shash_desc *desc)
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{
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struct sha1_hmac_ctx *sctx = crypto_shash_ctx(desc->tfm);
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//printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
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sctx->dbn = 0; //dbn workaround
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sha1_hmac_setkey_hw(sctx->key, sctx->keylen);
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return 0;
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}
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/*! \fn static void sha1_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
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* \ingroup IFX_SHA1_HMAC_FUNCTIONS
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* \brief on-the-fly sha1 hmac 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_hmac_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_hmac_ctx *sctx = crypto_shash_ctx(desc->tfm);
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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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// printk("sctx->count = %d\n", sctx->count);
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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_hmac_transform (desc, (const u32 *)sctx->buffer);
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for (; i + 63 < len; i += 64) {
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sha1_hmac_transform (desc, (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_hmac_final(struct crypto_tfm *tfm, u8 *out)
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* \ingroup IFX_SHA1_HMAC_FUNCTIONS
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* \brief ompute final sha1 hmac value
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* \param tfm linux crypto algo transform
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* \param out final sha1 hmac output value
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*/
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static int sha1_hmac_final(struct shash_desc *desc, u8 *out)
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{
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//struct sha1_hmac_ctx *sctx = shash_desc_ctx(desc);
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struct sha1_hmac_ctx *sctx = crypto_shash_ctx(desc->tfm);
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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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int i = 0;
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int dbn;
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u32 *in = &temp[0];
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t = sctx->count + 512; // need to add 512 bit of the IPAD operation
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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_hmac_update (desc, padding, padlen);
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/* Append length */
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sha1_hmac_update (desc, bits, sizeof bits);
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CRTCL_SECT_START;
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hashs->DBN = sctx->dbn;
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//for vr9 change, ENDI = 1
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*IFX_HASH_CON = HASH_CON_VALUE;
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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 (dbn = 0; dbn < sctx->dbn; dbn++)
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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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hashs->controlr.GO = 1;
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asm("sync");
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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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in += 16;
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}
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#if 1
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//wait for digest ready
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while (! hashs->controlr.DGRY) {
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// this will not take long
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}
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#endif
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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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memset(&sctx->buffer[0], 0, SHA1_HMAC_BLOCK_SIZE);
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sctx->count = 0;
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//printk("debug ln: %d, fn: %s\n", __LINE__, __func__);
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CRTCL_SECT_END;
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return 0;
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}
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/*
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* \brief SHA1-HMAC function mappings
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*/
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static struct shash_alg ifxdeu_sha1_hmac_alg = {
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.digestsize = SHA1_DIGEST_SIZE,
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.init = sha1_hmac_init,
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.update = sha1_hmac_update,
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.final = sha1_hmac_final,
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.setkey = sha1_hmac_setkey,
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.descsize = sizeof(struct sha1_hmac_ctx),
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.base = {
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.cra_name = "hmac(sha1)",
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.cra_driver_name= "ifxdeu-sha1_hmac",
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.cra_ctxsize = sizeof(struct sha1_hmac_ctx),
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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_hmac (void)
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* \ingroup IFX_SHA1_HMAC_FUNCTIONS
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* \brief initialize sha1 hmac driver
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*/
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int __init ifxdeu_init_sha1_hmac (void)
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{
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int ret = -ENOSYS;
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if ((ret = crypto_register_shash(&ifxdeu_sha1_hmac_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_HMAC 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_HMAC initialization failed!\n");
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return ret;
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}
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/*! \fn void __exit ifxdeu_fini_sha1_hmac (void)
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* \ingroup IFX_SHA1_HMAC_FUNCTIONS
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* \brief unregister sha1 hmac driver
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*/
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void __exit ifxdeu_fini_sha1_hmac (void)
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{
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crypto_unregister_shash(&ifxdeu_sha1_hmac_alg);
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}
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