1/****************************************************************************** 2** 3** FILE NAME : ifxmips_md5.c 4** PROJECT : IFX UEIP 5** MODULES : DEU Module for UEIP 6** 7** DATE : September 8, 2009 8** AUTHOR : Mohammad Firdaus 9** DESCRIPTION : Data Encryption Unit Driver 10** COPYRIGHT : Copyright (c) 2009 11** Infineon Technologies AG 12** Am Campeon 1-12, 85579 Neubiberg, Germany 13** 14** This program is free software; you can redistribute it and/or modify 15** it under the terms of the GNU General Public License as published by 16** the Free Software Foundation; either version 2 of the License, or 17** (at your option) any later version. 18** 19** HISTORY 20** $Date $Author $Comment 21** 08,Sept 2009 Mohammad Firdaus Initial UEIP release 22*******************************************************************************/ 23/*! 24 \defgroup IFX_DEU IFX_DEU_DRIVERS 25 \ingroup API 26 \brief ifx deu driver module 27*/ 28 29/*! 30 \file ifxmips_md5.c 31 \ingroup IFX_DEU 32 \brief MD5 encryption deu driver file 33*/ 34 35/*! 36 \defgroup IFX_MD5_FUNCTIONS IFX_MD5_FUNCTIONS 37 \ingroup IFX_DEU 38 \brief ifx deu MD5 functions 39*/ 40 41/*Project header files */ 42#include <linux/init.h> 43#include <linux/module.h> 44#include <linux/string.h> 45#include <linux/crypto.h> 46#include <linux/types.h> 47#include <crypto/internal/hash.h> 48#include <asm/byteorder.h> 49 50/* Project header */ 51#if defined(CONFIG_DANUBE) 52#include "ifxmips_deu_danube.h" 53#elif defined(CONFIG_AR9) 54#include "ifxmips_deu_ar9.h" 55#elif defined(CONFIG_VR9) || defined(CONFIG_AR10) 56#include "ifxmips_deu_vr9.h" 57#else 58#error "Plaform Unknwon!" 59#endif 60 61#define MD5_DIGEST_SIZE 16 62#define MD5_HMAC_BLOCK_SIZE 64 63#define MD5_BLOCK_WORDS 16 64#define MD5_HASH_WORDS 4 65#define HASH_START IFX_HASH_CON 66 67static spinlock_t lock; 68#define CRTCL_SECT_INIT spin_lock_init(&lock) 69#define CRTCL_SECT_START spin_lock_irqsave(&lock, flag) 70#define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag) 71 72//#define CRYPTO_DEBUG 73#ifdef CRYPTO_DEBUG 74extern char debug_level; 75#define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args); 76#else 77#define DPRINTF(level, format, args...) 78#endif 79 80struct md5_ctx { 81 int started; 82 u32 hash[MD5_HASH_WORDS]; 83 u32 block[MD5_BLOCK_WORDS]; 84 u64 byte_count; 85}; 86 87extern int disable_deudma; 88 89/*! \fn static u32 endian_swap(u32 input) 90 * \ingroup IFX_MD5_FUNCTIONS 91 * \brief perform dword level endian swap 92 * \param input value of dword that requires to be swapped 93*/ 94static u32 endian_swap(u32 input) 95{ 96 u8 *ptr = (u8 *)&input; 97 98 return ((ptr[3] << 24) | (ptr[2] << 16) | (ptr[1] << 8) | ptr[0]); 99} 100 101/*! \fn static void md5_transform(u32 *hash, u32 const *in) 102 * \ingroup IFX_MD5_FUNCTIONS 103 * \brief main interface to md5 hardware 104 * \param hash current hash value 105 * \param in 64-byte block of input 106*/ 107static void md5_transform(struct md5_ctx *mctx, u32 *hash, u32 const *in) 108{ 109 int i; 110 volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START; 111 unsigned long flag; 112 113 CRTCL_SECT_START; 114 115 if (mctx->started) { 116 hashs->D1R = endian_swap(*((u32 *) hash + 0)); 117 hashs->D2R = endian_swap(*((u32 *) hash + 1)); 118 hashs->D3R = endian_swap(*((u32 *) hash + 2)); 119 hashs->D4R = endian_swap(*((u32 *) hash + 3)); 120 } 121 122 for (i = 0; i < 16; i++) { 123 hashs->MR = endian_swap(in[i]); 124// printk("in[%d]: %08x\n", i, endian_swap(in[i])); 125 }; 126 127 //wait for processing 128 while (hashs->controlr.BSY) { 129 // this will not take long 130 } 131 132 *((u32 *) hash + 0) = endian_swap (hashs->D1R); 133 *((u32 *) hash + 1) = endian_swap (hashs->D2R); 134 *((u32 *) hash + 2) = endian_swap (hashs->D3R); 135 *((u32 *) hash + 3) = endian_swap (hashs->D4R); 136 137 mctx->started = 1; 138 139 CRTCL_SECT_END; 140} 141 142/*! \fn static inline void md5_transform_helper(struct md5_ctx *ctx) 143 * \ingroup IFX_MD5_FUNCTIONS 144 * \brief interfacing function for md5_transform() 145 * \param ctx crypto context 146*/ 147static inline void md5_transform_helper(struct md5_ctx *ctx) 148{ 149 //le32_to_cpu_array(ctx->block, sizeof(ctx->block) / sizeof(u32)); 150 md5_transform(ctx, ctx->hash, ctx->block); 151} 152 153/*! \fn static void md5_init(struct crypto_tfm *tfm) 154 * \ingroup IFX_MD5_FUNCTIONS 155 * \brief initialize md5 hardware 156 * \param tfm linux crypto algo transform 157*/ 158static int md5_init(struct shash_desc *desc) 159{ 160 struct md5_ctx *mctx = shash_desc_ctx(desc); 161 volatile struct deu_hash_t *hash = (struct deu_hash_t *) HASH_START; 162 163 hash->controlr.ENDI = 0; 164 hash->controlr.SM = 1; 165 hash->controlr.ALGO = 1; // 1 = md5 0 = sha1 166 hash->controlr.INIT = 1; // Initialize the hash operation by writing a '1' to the INIT bit. 167 168 mctx->byte_count = 0; 169 mctx->started = 0; 170 return 0; 171} 172 173/*! \fn static void md5_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len) 174 * \ingroup IFX_MD5_FUNCTIONS 175 * \brief on-the-fly md5 computation 176 * \param tfm linux crypto algo transform 177 * \param data input data 178 * \param len size of input data 179*/ 180static int md5_update(struct shash_desc *desc, const u8 *data, unsigned int len) 181{ 182 struct md5_ctx *mctx = shash_desc_ctx(desc); 183 const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f); 184 185 mctx->byte_count += len; 186 187 if (avail > len) { 188 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 189 data, len); 190 return 0; 191 } 192 193 memcpy((char *)mctx->block + (sizeof(mctx->block) - avail), 194 data, avail); 195 196 md5_transform_helper(mctx); 197 data += avail; 198 len -= avail; 199 200 while (len >= sizeof(mctx->block)) { 201 memcpy(mctx->block, data, sizeof(mctx->block)); 202 md5_transform_helper(mctx); 203 data += sizeof(mctx->block); 204 len -= sizeof(mctx->block); 205 } 206 207 memcpy(mctx->block, data, len); 208 return 0; 209} 210 211/*! \fn static void md5_final(struct crypto_tfm *tfm, u8 *out) 212 * \ingroup IFX_MD5_FUNCTIONS 213 * \brief compute final md5 value 214 * \param tfm linux crypto algo transform 215 * \param out final md5 output value 216*/ 217static int md5_final(struct shash_desc *desc, u8 *out) 218{ 219 struct md5_ctx *mctx = shash_desc_ctx(desc); 220 const unsigned int offset = mctx->byte_count & 0x3f; 221 char *p = (char *)mctx->block + offset; 222 int padding = 56 - (offset + 1); 223 volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START; 224 unsigned long flag; 225 226 *p++ = 0x80; 227 if (padding < 0) { 228 memset(p, 0x00, padding + sizeof (u64)); 229 md5_transform_helper(mctx); 230 p = (char *)mctx->block; 231 padding = 56; 232 } 233 234 memset(p, 0, padding); 235 mctx->block[14] = endian_swap(mctx->byte_count << 3); 236 mctx->block[15] = endian_swap(mctx->byte_count >> 29); 237 238#if 0 239 le32_to_cpu_array(mctx->block, (sizeof(mctx->block) - 240 sizeof(u64)) / sizeof(u32)); 241#endif 242 243 md5_transform(mctx, mctx->hash, mctx->block); 244 245 CRTCL_SECT_START; 246 247 *((u32 *) out + 0) = endian_swap (hashs->D1R); 248 *((u32 *) out + 1) = endian_swap (hashs->D2R); 249 *((u32 *) out + 2) = endian_swap (hashs->D3R); 250 *((u32 *) out + 3) = endian_swap (hashs->D4R); 251 252 CRTCL_SECT_END; 253 254 // Wipe context 255 memset(mctx, 0, sizeof(*mctx)); 256 257 return 0; 258} 259 260/* 261 * \brief MD5 function mappings 262*/ 263static struct shash_alg ifxdeu_md5_alg = { 264 .digestsize = MD5_DIGEST_SIZE, 265 .init = md5_init, 266 .update = md5_update, 267 .final = md5_final, 268 .descsize = sizeof(struct md5_ctx), 269 .base = { 270 .cra_name = "md5", 271 .cra_driver_name= "ifxdeu-md5", 272 .cra_flags = CRYPTO_ALG_TYPE_DIGEST, 273 .cra_blocksize = MD5_HMAC_BLOCK_SIZE, 274 .cra_module = THIS_MODULE, 275 } 276}; 277 278/*! \fn int __init ifxdeu_init_md5 (void) 279 * \ingroup IFX_MD5_FUNCTIONS 280 * \brief initialize md5 driver 281*/ 282int __init ifxdeu_init_md5 (void) 283{ 284 int ret = -ENOSYS; 285 286 287 if ((ret = crypto_register_shash(&ifxdeu_md5_alg))) 288 goto md5_err; 289 290 CRTCL_SECT_INIT; 291 292 printk (KERN_NOTICE "IFX DEU MD5 initialized%s.\n", disable_deudma ? "" : " (DMA)"); 293 return ret; 294 295md5_err: 296 printk(KERN_ERR "IFX DEU MD5 initialization failed!\n"); 297 return ret; 298} 299 300/*! \fn void __exit ifxdeu_fini_md5 (void) 301 * \ingroup IFX_MD5_FUNCTIONS 302 * \brief unregister md5 driver 303*/ 304 305void __exit ifxdeu_fini_md5 (void) 306{ 307 crypto_unregister_shash(&ifxdeu_md5_alg); 308 309} 310 311