--- /dev/null
+/******************************************************************************
+**
+** FILE NAME : ifxmips_md5_hmac.c
+** PROJECT : IFX UEIP
+** MODULES : DEU Module for UEIP
+**
+** DATE : September 8, 2009
+** AUTHOR : Mohammad Firdaus
+** DESCRIPTION : Data Encryption Unit Driver
+** COPYRIGHT : Copyright (c) 2009
+** Infineon Technologies AG
+** Am Campeon 1-12, 85579 Neubiberg, Germany
+**
+** This program is free software; you can redistribute it and/or modify
+** it under the terms of the GNU General Public License as published by
+** the Free Software Foundation; either version 2 of the License, or
+** (at your option) any later version.
+**
+** HISTORY
+** $Date $Author $Comment
+** 08,Sept 2009 Mohammad Firdaus Initial UEIP release
+** 21,March 2011 Mohammad Firdaus Changes for Kernel 2.6.32 and IPSec integration
+*******************************************************************************/
+/*!
+ \defgroup IFX_DEU IFX_DEU_DRIVERS
+ \ingroup API
+ \brief ifx deu driver module
+*/
+
+/*!
+ \file ifxmips_md5_hmac.c
+ \ingroup IFX_DEU
+ \brief MD5-HMAC encryption deu driver file
+*/
+
+/*!
+ \defgroup IFX_MD5_HMAC_FUNCTIONS IFX_MD5_HMAC_FUNCTIONS
+ \ingroup IFX_DEU
+ \brief ifx md5-hmac driver functions
+*/
+
+/* Project Header files */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/crypto.h>
+#include <linux/types.h>
+#include <crypto/internal/hash.h>
+#include <asm/byteorder.h>
+
+#if defined(CONFIG_AR9)
+#include "ifxmips_deu_ar9.h"
+#elif defined(CONFIG_VR9) || defined(CONFIG_AR10)
+#include "ifxmips_deu_vr9.h"
+#else
+#error "Plaform Unknwon!"
+#endif
+
+#define MD5_DIGEST_SIZE 16
+#define MD5_HMAC_BLOCK_SIZE 64
+#define MD5_BLOCK_WORDS 16
+#define MD5_HASH_WORDS 4
+#define MD5_HMAC_DBN_TEMP_SIZE 1024 // size in dword, needed for dbn workaround
+#define HASH_START IFX_HASH_CON
+
+static spinlock_t lock;
+#define CRTCL_SECT_INIT spin_lock_init(&lock)
+#define CRTCL_SECT_START spin_lock_irqsave(&lock, flag)
+#define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag)
+
+//#define CRYPTO_DEBUG
+#ifdef CRYPTO_DEBUG
+extern char debug_level;
+#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args);
+#else
+#define DPRINTF(level, format, args...)
+#endif
+
+#define MAX_HASH_KEYLEN 64
+
+struct md5_hmac_ctx {
+ u8 key[MAX_HASH_KEYLEN];
+ u32 hash[MD5_HASH_WORDS];
+ u32 block[MD5_BLOCK_WORDS];
+ u64 byte_count;
+ u32 dbn;
+ unsigned int keylen;
+};
+
+static u32 temp[MD5_HMAC_DBN_TEMP_SIZE];
+
+extern int disable_deudma;
+
+/*! \fn static u32 endian_swap(u32 input)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief perform dword level endian swap
+ * \param input value of dword that requires to be swapped
+*/
+static u32 endian_swap(u32 input)
+{
+ u8 *ptr = (u8 *)&input;
+
+ return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]);
+}
+
+/*! \fn static void md5_hmac_transform(struct crypto_tfm *tfm, u32 const *in)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief save input block to context
+ * \param tfm linux crypto algo transform
+ * \param in 64-byte block of input
+*/
+static void md5_hmac_transform(struct shash_desc *desc, u32 const *in)
+{
+ struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
+
+ memcpy(&temp[mctx->dbn<<4], in, 64); //dbn workaround
+ mctx->dbn += 1;
+
+ if ( (mctx->dbn<<4) > MD5_HMAC_DBN_TEMP_SIZE )
+ {
+ printk("MD5_HMAC_DBN_TEMP_SIZE exceeded\n");
+ }
+
+}
+
+/*! \fn int md5_hmac_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief sets md5 hmac key
+ * \param tfm linux crypto algo transform
+ * \param key input key
+ * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
+*/
+static int md5_hmac_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
+{
+ struct md5_hmac_ctx *mctx = crypto_shash_ctx(tfm);
+ volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
+ //printk("copying keys to context with length %d\n", keylen);
+
+ if (keylen > MAX_HASH_KEYLEN) {
+ printk("Key length more than what DEU hash can handle\n");
+ return -EINVAL;
+ }
+
+
+ hash->KIDX |= 0x80000000; // reset all 16 words of the key to '0'
+ memcpy(&mctx->key, key, keylen);
+ mctx->keylen = keylen;
+
+ return 0;
+
+}
+
+
+/*! \fn int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief sets md5 hmac key into the hardware registers
+ * \param key input key
+ * \param keylen key length greater than 64 bytes IS NOT SUPPORTED
+*/
+
+static int md5_hmac_setkey_hw(const u8 *key, unsigned int keylen)
+{
+ volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
+ unsigned long flag;
+ int i, j;
+ u32 *in_key = (u32 *)key;
+
+ //printk("\nsetkey keylen: %d\n key: ", keylen);
+
+ CRTCL_SECT_START;
+ j = 0;
+ for (i = 0; i < keylen; i+=4)
+ {
+ hash->KIDX = j;
+ asm("sync");
+ hash->KEY = *((u32 *) in_key + j);
+ asm("sync");
+ j++;
+ }
+ CRTCL_SECT_END;
+
+ return 0;
+}
+
+/*! \fn void md5_hmac_init(struct crypto_tfm *tfm)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief initialize md5 hmac context
+ * \param tfm linux crypto algo transform
+*/
+static int md5_hmac_init(struct shash_desc *desc)
+{
+
+ struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
+
+
+ mctx->dbn = 0; //dbn workaround
+ md5_hmac_setkey_hw(mctx->key, mctx->keylen);
+
+ return 0;
+}
+EXPORT_SYMBOL(md5_hmac_init);
+
+/*! \fn void md5_hmac_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief on-the-fly md5 hmac computation
+ * \param tfm linux crypto algo transform
+ * \param data input data
+ * \param len size of input data
+*/
+static int md5_hmac_update(struct shash_desc *desc, const u8 *data, unsigned int len)
+{
+ struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
+ const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
+
+ mctx->byte_count += len;
+
+ if (avail > len) {
+ memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
+ data, len);
+ return 0;
+ }
+
+ memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
+ data, avail);
+
+ md5_hmac_transform(desc, mctx->block);
+ data += avail;
+ len -= avail;
+
+ while (len >= sizeof(mctx->block)) {
+ memcpy(mctx->block, data, sizeof(mctx->block));
+ md5_hmac_transform(desc, mctx->block);
+ data += sizeof(mctx->block);
+ len -= sizeof(mctx->block);
+ }
+
+ memcpy(mctx->block, data, len);
+ return 0;
+}
+EXPORT_SYMBOL(md5_hmac_update);
+
+/*! \fn void md5_hmac_final(struct crypto_tfm *tfm, u8 *out)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief compute final md5 hmac value
+ * \param tfm linux crypto algo transform
+ * \param out final md5 hmac output value
+*/
+static int md5_hmac_final(struct shash_desc *desc, u8 *out)
+{
+ struct md5_hmac_ctx *mctx = crypto_shash_ctx(desc->tfm);
+ const unsigned int offset = mctx->byte_count & 0x3f;
+ char *p = (char *)mctx->block + offset;
+ int padding = 56 - (offset + 1);
+ volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
+ unsigned long flag;
+ int i = 0;
+ int dbn;
+ u32 *in = &temp[0];
+
+
+ *p++ = 0x80;
+ if (padding < 0) {
+ memset(p, 0x00, padding + sizeof (u64));
+ md5_hmac_transform(desc, mctx->block);
+ p = (char *)mctx->block;
+ padding = 56;
+ }
+
+ memset(p, 0, padding);
+ mctx->block[14] = endian_swap((mctx->byte_count + 64) << 3); // need to add 512 bit of the IPAD operation
+ mctx->block[15] = 0x00000000;
+
+ md5_hmac_transform(desc, mctx->block);
+
+ CRTCL_SECT_START;
+
+ //printk("\ndbn = %d\n", mctx->dbn);
+ hashs->DBN = mctx->dbn;
+ asm("sync");
+
+ *IFX_HASH_CON = 0x0703002D; //khs, go, init, ndc, endi, kyue, hmen, md5
+
+ //wait for processing
+ while (hashs->controlr.BSY) {
+ // this will not take long
+ }
+
+ for (dbn = 0; dbn < mctx->dbn; dbn++)
+ {
+ for (i = 0; i < 16; i++) {
+ hashs->MR = in[i];
+ };
+
+ hashs->controlr.GO = 1;
+ asm("sync");
+
+ //wait for processing
+ while (hashs->controlr.BSY) {
+ // this will not take long
+ }
+
+ in += 16;
+}
+
+
+#if 1
+ //wait for digest ready
+ while (! hashs->controlr.DGRY) {
+ // this will not take long
+ }
+#endif
+
+ *((u32 *) out + 0) = hashs->D1R;
+ *((u32 *) out + 1) = hashs->D2R;
+ *((u32 *) out + 2) = hashs->D3R;
+ *((u32 *) out + 3) = hashs->D4R;
+ *((u32 *) out + 4) = hashs->D5R;
+
+ /* reset the context after we finish with the hash */
+ mctx->byte_count = 0;
+ memset(&mctx->hash[0], 0, sizeof(MD5_HASH_WORDS));
+ memset(&mctx->block[0], 0, sizeof(MD5_BLOCK_WORDS));
+ memset(&temp[0], 0, MD5_HMAC_DBN_TEMP_SIZE);
+
+ CRTCL_SECT_END;
+
+
+ return 0;
+}
+
+EXPORT_SYMBOL(md5_hmac_final);
+
+/*
+ * \brief MD5_HMAC function mappings
+*/
+
+static struct shash_alg ifxdeu_md5_hmac_alg = {
+ .digestsize = MD5_DIGEST_SIZE,
+ .init = md5_hmac_init,
+ .update = md5_hmac_update,
+ .final = md5_hmac_final,
+ .setkey = md5_hmac_setkey,
+ .descsize = sizeof(struct md5_hmac_ctx),
+ .base = {
+ .cra_name = "hmac(md5)",
+ .cra_driver_name= "ifxdeu-md5_hmac",
+ .cra_ctxsize = sizeof(struct md5_hmac_ctx),
+ .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
+ .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
+ .cra_module = THIS_MODULE,
+ }
+};
+
+/*! \fn int __init ifxdeu_init_md5_hmac (void)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief initialize md5 hmac driver
+*/
+int __init ifxdeu_init_md5_hmac (void)
+{
+
+ int ret = -ENOSYS;
+
+
+ if ((ret = crypto_register_shash(&ifxdeu_md5_hmac_alg)))
+ goto md5_hmac_err;
+
+ CRTCL_SECT_INIT;
+
+ printk (KERN_NOTICE "IFX DEU MD5_HMAC initialized%s.\n", disable_deudma ? "" : " (DMA)");
+ return ret;
+
+md5_hmac_err:
+ printk(KERN_ERR "IFX DEU MD5_HMAC initialization failed!\n");
+ return ret;
+}
+
+/** \fn void __exit ifxdeu_fini_md5_hmac (void)
+ * \ingroup IFX_MD5_HMAC_FUNCTIONS
+ * \brief unregister md5 hmac driver
+*/
+void __exit ifxdeu_fini_md5_hmac (void)
+{
+ crypto_unregister_shash(&ifxdeu_md5_hmac_alg);
+}
+
+
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