| 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 | |
| 67 | static 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 |
| 74 | extern 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 | |
| 80 | struct md5_ctx { |
| 81 | int started; |
| 82 | u32 hash[MD5_HASH_WORDS]; |
| 83 | u32 block[MD5_BLOCK_WORDS]; |
| 84 | u64 byte_count; |
| 85 | }; |
| 86 | |
| 87 | extern 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 | */ |
| 94 | static 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 | */ |
| 107 | static 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 | */ |
| 147 | static 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 | */ |
| 158 | static 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 | */ |
| 180 | static 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 | */ |
| 217 | static 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 | */ |
| 263 | static 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 | */ |
| 282 | int __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 | |
| 295 | md5_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 | |
| 305 | void __exit ifxdeu_fini_md5 (void) |
| 306 | { |
| 307 | crypto_unregister_shash(&ifxdeu_md5_alg); |
| 308 | |
| 309 | } |
| 310 | |
| 311 | |
