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006fee0dad
The processing in the hmac algorithms depends on the status fields: count, dbn and started. Not all were initialised in the init method and after finishing the final method. Added missing fields to init method and call init method after finishing final. The memsets have the wrong size in the original driver and did not clear everything and are not necessary. Since no memset is done in the kernels generic implementation, memsets were removed. Signed-off-by: Daniel Kestrel <kestrel1974@t-online.de>
429 lines
12 KiB
C
429 lines
12 KiB
C
/******************************************************************************
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**
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** FILE NAME : ifxmips_md5_hmac.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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** 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_md5_hmac.c
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\ingroup IFX_DEU
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\brief MD5-HMAC encryption deu driver file
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*/
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/*!
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\defgroup IFX_MD5_HMAC_FUNCTIONS IFX_MD5_HMAC_FUNCTIONS
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\ingroup IFX_DEU
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\brief ifx md5-hmac driver 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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#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 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 MD5_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 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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#define MAX_HASH_KEYLEN 64
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struct md5_hmac_ctx {
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u8 key[MAX_HASH_KEYLEN];
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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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u32 dbn;
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int started;
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unsigned int keylen;
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struct shash_desc *desc;
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u32 (*temp)[MD5_BLOCK_WORDS];
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};
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extern int disable_deudma;
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static int md5_hmac_final_impl(struct shash_desc *desc, u8 *out, bool hash_final);
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/*! \fn static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
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* \ingroup IFX_MD5_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 void md5_hmac_transform(struct shash_desc *desc, u32 const *in)
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{
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struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
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if ( ((mctx->dbn<<4)+1) > MD5_HMAC_DBN_TEMP_SIZE )
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{
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//printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n");
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md5_hmac_final_impl(desc, (u8 *)mctx->hash, false);
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}
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memcpy(&mctx->temp[mctx->dbn], in, 64); //dbn workaround
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mctx->dbn += 1;
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}
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/*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief sets md5 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 md5_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
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{
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struct md5_hmac_ctx *mctx = crypto_shash_ctx(tfm);
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int err;
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//printk("copying keys to context with length %d\n", keylen);
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if (keylen > MAX_HASH_KEYLEN) {
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char *hash_alg_name = "md5";
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mctx->desc->tfm = crypto_alloc_shash(hash_alg_name, 0, 0);
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if (IS_ERR(mctx->desc->tfm)) return PTR_ERR(mctx->desc->tfm);
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memset(mctx->key, 0, MAX_HASH_KEYLEN);
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err = crypto_shash_digest(mctx->desc, key, keylen, mctx->key);
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if (err) return err;
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mctx->keylen = MD5_DIGEST_SIZE;
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crypto_free_shash(mctx->desc->tfm);
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} else {
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memcpy(mctx->key, key, keylen);
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mctx->keylen = keylen;
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}
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memset(mctx->key + mctx->keylen, 0, MAX_HASH_KEYLEN - mctx->keylen);
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return 0;
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}
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/*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief sets md5 hmac key into the hardware registers
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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 md5_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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u32 *in_key = (u32 *)key;
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//printk("\nsetkey keylen: %d\n key: ", keylen);
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hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0'
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j = 0;
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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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asm("sync");
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j++;
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}
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return 0;
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}
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/*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief initialize md5 hmac context
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* \param tfm linux crypto algo transform
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*/
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static int md5_hmac_init(struct shash_desc *desc)
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{
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struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
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mctx->dbn = 0; //dbn workaround
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mctx->started = 0;
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mctx->byte_count = 0;
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return 0;
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}
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/*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief on-the-fly md5 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 md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len)
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{
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struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
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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_hmac_transform(desc, mctx->block);
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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_hmac_transform(desc, mctx->block);
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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 int md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief call md5_hmac_final_impl with hash_final true
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* \param tfm linux crypto algo transform
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* \param out final md5 hmac output value
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*/
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static int md5_hmac_final(struct shash_desc *desc, u8 *out)
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{
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return md5_hmac_final_impl(desc, out, true);
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}
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/*! \fn static int md5_hmac_final_impl(struct crypto_tfm *tfm, u8 *out, bool hash_final)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief compute final or intermediate md5 hmac value
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* \param tfm linux crypto algo transform
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* \param out final md5 hmac output value
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* \param in finalize or intermediate processing
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*/
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static int md5_hmac_final_impl(struct shash_desc *desc, u8 *out, bool hash_final)
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{
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struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
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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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int i = 0;
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int dbn;
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u32 *in = mctx->temp[0];
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if (hash_final) {
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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_hmac_transform(desc, mctx->block);
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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] = le32_to_cpu((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
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mctx->block[15] = 0x00000000;
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md5_hmac_transform(desc, mctx->block);
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}
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CRTCL_SECT_HASH_START;
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MD5_HASH_INIT;
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md5_hmac_setkey_hw(mctx->key, mctx->keylen);
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//printk("\ndbn = %d\n", mctx->dbn);
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if (hash_final) {
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hashs->DBN = mctx->dbn;
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} else {
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hashs->DBN = mctx->dbn + 5;
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}
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asm("sync");
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*IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
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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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if (mctx->started) {
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hashs->D1R = *((u32 *) mctx->hash + 0);
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hashs->D2R = *((u32 *) mctx->hash + 1);
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hashs->D3R = *((u32 *) mctx->hash + 2);
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hashs->D4R = *((u32 *) mctx->hash + 3);
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} else {
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mctx->started = 1;
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}
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for (dbn = 0; dbn < mctx->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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if (hash_final) {
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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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}
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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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CRTCL_SECT_HASH_END;
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if (hash_final) {
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/* reset the context after we finish with the hash */
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md5_hmac_init(desc);
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} else {
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mctx->dbn = 0;
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}
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return 0;
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}
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/*! \fn void md5_hmac_init_tfm(struct crypto_tfm *tfm)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief initialize pointers in md5_hmac_ctx
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* \param tfm linux crypto algo transform
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*/
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static int md5_hmac_init_tfm(struct crypto_tfm *tfm)
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{
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struct md5_hmac_ctx *mctx = crypto_tfm_ctx(tfm);
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mctx->temp = kzalloc(4 * MD5_HMAC_DBN_TEMP_SIZE, GFP_KERNEL);
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if (IS_ERR(mctx->temp)) return PTR_ERR(mctx->temp);
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mctx->desc = kzalloc(sizeof(struct shash_desc), GFP_KERNEL);
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if (IS_ERR(mctx->desc)) return PTR_ERR(mctx->desc);
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return 0;
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}
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/*! \fn void md5_hmac_exit_tfm(struct crypto_tfm *tfm)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief free pointers in md5_hmac_ctx
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* \param tfm linux crypto algo transform
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*/
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static void md5_hmac_exit_tfm(struct crypto_tfm *tfm)
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{
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struct md5_hmac_ctx *mctx = crypto_tfm_ctx(tfm);
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kfree(mctx->temp);
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kfree(mctx->desc);
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}
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/*
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* \brief MD5_HMAC function mappings
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*/
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static struct shash_alg ifxdeu_md5_hmac_alg = {
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.digestsize = MD5_DIGEST_SIZE,
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.init = md5_hmac_init,
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.update = md5_hmac_update,
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.final = md5_hmac_final,
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.setkey = md5_hmac_setkey,
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.descsize = sizeof(struct md5_hmac_ctx),
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.base = {
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.cra_name = "hmac(md5)",
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.cra_driver_name= "ifxdeu-md5_hmac",
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.cra_priority = 400,
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.cra_ctxsize = sizeof(struct md5_hmac_ctx),
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.cra_flags = CRYPTO_ALG_TYPE_HASH | CRYPTO_ALG_KERN_DRIVER_ONLY,
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.cra_blocksize = MD5_HMAC_BLOCK_SIZE,
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.cra_module = THIS_MODULE,
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.cra_init = md5_hmac_init_tfm,
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.cra_exit = md5_hmac_exit_tfm,
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}
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};
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/*! \fn int ifxdeu_init_md5_hmac (void)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief initialize md5 hmac driver
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*/
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int ifxdeu_init_md5_hmac (void)
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{
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int ret = -ENOSYS;
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if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg)))
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goto md5_hmac_err;
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printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
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return ret;
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md5_hmac_err:
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printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
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return ret;
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}
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/** \fn void ifxdeu_fini_md5_hmac (void)
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* \ingroup IFX_MD5_HMAC_FUNCTIONS
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* \brief unregister md5 hmac driver
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*/
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void ifxdeu_fini_md5_hmac (void)
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{
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crypto_unregister_shash(&ifxdeu_md5_hmac_alg);
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}
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