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+/******************************************************************************
+**
+** FILE NAME : ifxmips_md5.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
+*******************************************************************************/
+/*!
+ \defgroup IFX_DEU IFX_DEU_DRIVERS
+ \ingroup API
+ \brief ifx deu driver module
+*/
+
+/*!
+ \file ifxmips_md5.c
+ \ingroup IFX_DEU
+ \brief MD5 encryption deu driver file
+*/
+
+/*!
+ \defgroup IFX_MD5_FUNCTIONS IFX_MD5_FUNCTIONS
+ \ingroup IFX_DEU
+ \brief ifx deu MD5 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>
+
+/* Project header */
+#if defined(CONFIG_DANUBE)
+#include "ifxmips_deu_danube.h"
+#elif 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 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
+
+struct md5_ctx {
+ int started;
+ u32 hash[MD5_HASH_WORDS];
+ u32 block[MD5_BLOCK_WORDS];
+ u64 byte_count;
+};
+
+extern int disable_deudma;
+
+/*! \fn static u32 endian_swap(u32 input)
+ * \ingroup IFX_MD5_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_transform(u32 *hash, u32 const *in)
+ * \ingroup IFX_MD5_FUNCTIONS
+ * \brief main interface to md5 hardware
+ * \param hash current hash value
+ * \param in 64-byte block of input
+*/
+static void md5_transform(struct md5_ctx *mctx, u32 *hash, u32 const *in)
+{
+ int i;
+ volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START;
+ unsigned long flag;
+
+ CRTCL_SECT_START;
+
+ if (mctx->started) {
+ hashs->D1R = endian_swap(*((u32 *) hash + 0));
+ hashs->D2R = endian_swap(*((u32 *) hash + 1));
+ hashs->D3R = endian_swap(*((u32 *) hash + 2));
+ hashs->D4R = endian_swap(*((u32 *) hash + 3));
+ }
+
+ for (i = 0; i < 16; i++) {
+ hashs->MR = endian_swap(in[i]);
+// printk("in[%d]: %08x\n", i, endian_swap(in[i]));
+ };
+
+ //wait for processing
+ while (hashs->controlr.BSY) {
+ // this will not take long
+ }
+
+ *((u32 *) hash + 0) = endian_swap (hashs->D1R);
+ *((u32 *) hash + 1) = endian_swap (hashs->D2R);
+ *((u32 *) hash + 2) = endian_swap (hashs->D3R);
+ *((u32 *) hash + 3) = endian_swap (hashs->D4R);
+
+ mctx->started = 1;
+
+ CRTCL_SECT_END;
+}
+
+/*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx)
+ * \ingroup IFX_MD5_FUNCTIONS
+ * \brief interfacing function for md5_transform()
+ * \param ctx crypto context
+*/
+static inline void md5_transform_helper(struct md5_ctx *ctx)
+{
+ //le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32));
+ md5_transform(ctx, ctx->hash, ctx->block);
+}
+
+/*! \fn static void md5_init(struct crypto_tfm *tfm)
+ * \ingroup IFX_MD5_FUNCTIONS
+ * \brief initialize md5 hardware
+ * \param tfm linux crypto algo transform
+*/
+static int md5_init(struct shash_desc *desc)
+{
+ struct md5_ctx *mctx = shash_desc_ctx(desc);
+ volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START;
+
+ hash->controlr.ENDI = 0;
+ hash->controlr.SM = 1;
+ hash->controlr.ALGO = 1; // 1 = md5 0 = sha1
+ hash->controlr.INIT = 1; // Initialize the hash operation by writing a '1' to the INIT bit.
+
+ mctx->byte_count = 0;
+ mctx->started = 0;
+ return 0;
+}
+
+/*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len)
+ * \ingroup IFX_MD5_FUNCTIONS
+ * \brief on-the-fly md5 computation
+ * \param tfm linux crypto algo transform
+ * \param data input data
+ * \param len size of input data
+*/
+static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len)
+{
+ struct md5_ctx *mctx = shash_desc_ctx(desc);
+ 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_transform_helper(mctx);
+ data += avail;
+ len -= avail;
+
+ while (len >= sizeof(mctx->block)) {
+ memcpy(mctx->block, data, sizeof(mctx->block));
+ md5_transform_helper(mctx);
+ data += sizeof(mctx->block);
+ len -= sizeof(mctx->block);
+ }
+
+ memcpy(mctx->block, data, len);
+ return 0;
+}
+
+/*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out)
+ * \ingroup IFX_MD5_FUNCTIONS
+ * \brief compute final md5 value
+ * \param tfm linux crypto algo transform
+ * \param out final md5 output value
+*/
+static int md5_final(struct shash_desc *desc, u8 *out)
+{
+ struct md5_ctx *mctx = shash_desc_ctx(desc);
+ 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;
+
+ *p++ = 0x80;
+ if (padding < 0) {
+ memset(p, 0x00, padding + sizeof (u64));
+ md5_transform_helper(mctx);
+ p = (char *)mctx->block;
+ padding = 56;
+ }
+
+ memset(p, 0, padding);
+ mctx->block[14] = endian_swap(mctx->byte_count << 3);
+ mctx->block[15] = endian_swap(mctx->byte_count >> 29);
+
+#if 0
+ le32_to_cpu_array(mctx->block, (sizeof(mctx->block) -
+ sizeof(u64)) / sizeof(u32));
+#endif
+
+ md5_transform(mctx, mctx->hash, mctx->block);
+
+ CRTCL_SECT_START;
+
+ *((u32 *) out + 0) = endian_swap (hashs->D1R);
+ *((u32 *) out + 1) = endian_swap (hashs->D2R);
+ *((u32 *) out + 2) = endian_swap (hashs->D3R);
+ *((u32 *) out + 3) = endian_swap (hashs->D4R);
+
+ CRTCL_SECT_END;
+
+ // Wipe context
+ memset(mctx, 0, sizeof(*mctx));
+
+ return 0;
+}
+
+/*
+ * \brief MD5 function mappings
+*/
+static struct shash_alg ifxdeu_md5_alg = {
+ .digestsize = MD5_DIGEST_SIZE,
+ .init = md5_init,
+ .update = md5_update,
+ .final = md5_final,
+ .descsize = sizeof(struct md5_ctx),
+ .base = {
+ .cra_name = "md5",
+ .cra_driver_name= "ifxdeu-md5",
+ .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
+ .cra_blocksize = MD5_HMAC_BLOCK_SIZE,
+ .cra_module = THIS_MODULE,
+ }
+};
+
+/*! \fn int __init ifxdeu_init_md5 (void)
+ * \ingroup IFX_MD5_FUNCTIONS
+ * \brief initialize md5 driver
+*/
+int __init ifxdeu_init_md5 (void)
+{
+ int ret = -ENOSYS;
+
+
+ if ((ret = crypto_register_shash(&ifxdeu_md5_alg)))
+ goto md5_err;
+
+ CRTCL_SECT_INIT;
+
+ printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)");
+ return ret;
+
+md5_err:
+ printk(KERN_ERR "IFX DEU MD5 initialization failed!\n");
+ return ret;
+}
+
+/*! \fn void __exit ifxdeu_fini_md5 (void)
+ * \ingroup IFX_MD5_FUNCTIONS
+ * \brief unregister md5 driver
+*/
+
+void __exit ifxdeu_fini_md5 (void)
+{
+ crypto_unregister_shash(&ifxdeu_md5_alg);
+
+}
+
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