| 1 | /****************************************************************************** |
| 2 | ** |
| 3 | ** FILE NAME : ifxmips_sha1.c |
| 4 | ** PROJECT : IFX UEIP |
| 5 | ** MODULES : DEU Module for Danube |
| 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_sha1.c |
| 31 | \ingroup IFX_DEU |
| 32 | \brief SHA1 encryption deu driver file |
| 33 | */ |
| 34 | |
| 35 | /*! |
| 36 | \defgroup IFX_SHA1_FUNCTIONS IFX_SHA1_FUNCTIONS |
| 37 | \ingroup IFX_DEU |
| 38 | \brief ifx deu sha1 functions |
| 39 | */ |
| 40 | |
| 41 | |
| 42 | /* Project header */ |
| 43 | #include <linux/init.h> |
| 44 | #include <linux/module.h> |
| 45 | #include <linux/mm.h> |
| 46 | #include <linux/crypto.h> |
| 47 | #include <linux/cryptohash.h> |
| 48 | #include <crypto/sha.h> |
| 49 | #include <crypto/internal/hash.h> |
| 50 | #include <linux/types.h> |
| 51 | #include <asm/scatterlist.h> |
| 52 | #include <asm/byteorder.h> |
| 53 | |
| 54 | #if defined(CONFIG_DANUBE) |
| 55 | #include "ifxmips_deu_danube.h" |
| 56 | #elif defined(CONFIG_AR9) |
| 57 | #include "ifxmips_deu_ar9.h" |
| 58 | #elif defined(CONFIG_VR9) || defined(CONFIG_AR10) |
| 59 | #include "ifxmips_deu_vr9.h" |
| 60 | #else |
| 61 | #error "Plaform Unknwon!" |
| 62 | #endif |
| 63 | |
| 64 | #define SHA1_DIGEST_SIZE 20 |
| 65 | #define SHA1_HMAC_BLOCK_SIZE 64 |
| 66 | #define HASH_START IFX_HASH_CON |
| 67 | |
| 68 | static spinlock_t lock; |
| 69 | #define CRTCL_SECT_INIT spin_lock_init(&lock) |
| 70 | #define CRTCL_SECT_START spin_lock_irqsave(&lock, flag) |
| 71 | #define CRTCL_SECT_END spin_unlock_irqrestore(&lock, flag) |
| 72 | |
| 73 | //#define CRYPTO_DEBUG |
| 74 | #ifdef CRYPTO_DEBUG |
| 75 | extern char debug_level; |
| 76 | #define DPRINTF(level, format, args...) if (level < debug_level) printk(KERN_INFO "[%s %s %d]: " format, __FILE__, __func__, __LINE__, ##args); |
| 77 | #else |
| 78 | #define DPRINTF(level, format, args...) |
| 79 | #endif |
| 80 | |
| 81 | /* |
| 82 | * \brief SHA1 private structure |
| 83 | */ |
| 84 | struct sha1_ctx { |
| 85 | int started; |
| 86 | u64 count; |
| 87 | u32 hash[5]; |
| 88 | u32 state[5]; |
| 89 | u8 buffer[64]; |
| 90 | }; |
| 91 | |
| 92 | extern int disable_deudma; |
| 93 | |
| 94 | |
| 95 | /*! \fn static void sha1_transform (u32 *state, const u32 *in) |
| 96 | * \ingroup IFX_SHA1_FUNCTIONS |
| 97 | * \brief main interface to sha1 hardware |
| 98 | * \param state current state |
| 99 | * \param in 64-byte block of input |
| 100 | */ |
| 101 | static void sha1_transform (struct sha1_ctx *sctx, u32 *state, const u32 *in) |
| 102 | { |
| 103 | int i = 0; |
| 104 | volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START; |
| 105 | unsigned long flag; |
| 106 | |
| 107 | CRTCL_SECT_START; |
| 108 | |
| 109 | /* For context switching purposes, the previous hash output |
| 110 | * is loaded back into the output register |
| 111 | */ |
| 112 | if (sctx->started) { |
| 113 | hashs->D1R = *((u32 *) sctx->hash + 0); |
| 114 | hashs->D2R = *((u32 *) sctx->hash + 1); |
| 115 | hashs->D3R = *((u32 *) sctx->hash + 2); |
| 116 | hashs->D4R = *((u32 *) sctx->hash + 3); |
| 117 | hashs->D5R = *((u32 *) sctx->hash + 4); |
| 118 | } |
| 119 | |
| 120 | for (i = 0; i < 16; i++) { |
| 121 | hashs->MR = in[i]; |
| 122 | }; |
| 123 | |
| 124 | //wait for processing |
| 125 | while (hashs->controlr.BSY) { |
| 126 | // this will not take long |
| 127 | } |
| 128 | |
| 129 | /* For context switching purposes, the output is saved into a |
| 130 | * context struct which can be used later on |
| 131 | */ |
| 132 | *((u32 *) sctx->hash + 0) = hashs->D1R; |
| 133 | *((u32 *) sctx->hash + 1) = hashs->D2R; |
| 134 | *((u32 *) sctx->hash + 2) = hashs->D3R; |
| 135 | *((u32 *) sctx->hash + 3) = hashs->D4R; |
| 136 | *((u32 *) sctx->hash + 4) = hashs->D5R; |
| 137 | |
| 138 | sctx->started = 1; |
| 139 | |
| 140 | CRTCL_SECT_END; |
| 141 | } |
| 142 | |
| 143 | /*! \fn static void sha1_init(struct crypto_tfm *tfm) |
| 144 | * \ingroup IFX_SHA1_FUNCTIONS |
| 145 | * \brief initialize sha1 hardware |
| 146 | * \param tfm linux crypto algo transform |
| 147 | */ |
| 148 | static int sha1_init(struct shash_desc *desc) |
| 149 | { |
| 150 | struct sha1_ctx *sctx = shash_desc_ctx(desc); |
| 151 | |
| 152 | SHA_HASH_INIT; |
| 153 | |
| 154 | sctx->started = 0; |
| 155 | sctx->count = 0; |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | /*! \fn static void sha1_update(struct crypto_tfm *tfm, const u8 *data, unsigned int len) |
| 160 | * \ingroup IFX_SHA1_FUNCTIONS |
| 161 | * \brief on-the-fly sha1 computation |
| 162 | * \param tfm linux crypto algo transform |
| 163 | * \param data input data |
| 164 | * \param len size of input data |
| 165 | */ |
| 166 | static int sha1_update(struct shash_desc * desc, const u8 *data, |
| 167 | unsigned int len) |
| 168 | { |
| 169 | struct sha1_ctx *sctx = shash_desc_ctx(desc); |
| 170 | unsigned int i, j; |
| 171 | |
| 172 | j = (sctx->count >> 3) & 0x3f; |
| 173 | sctx->count += len << 3; |
| 174 | |
| 175 | if ((j + len) > 63) { |
| 176 | memcpy (&sctx->buffer[j], data, (i = 64 - j)); |
| 177 | sha1_transform (sctx, sctx->state, (const u32 *)sctx->buffer); |
| 178 | for (; i + 63 < len; i += 64) { |
| 179 | sha1_transform (sctx, sctx->state, (const u32 *)&data[i]); |
| 180 | } |
| 181 | |
| 182 | j = 0; |
| 183 | } |
| 184 | else |
| 185 | i = 0; |
| 186 | |
| 187 | memcpy (&sctx->buffer[j], &data[i], len - i); |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | /*! \fn static void sha1_final(struct crypto_tfm *tfm, u8 *out) |
| 192 | * \ingroup IFX_SHA1_FUNCTIONS |
| 193 | * \brief compute final sha1 value |
| 194 | * \param tfm linux crypto algo transform |
| 195 | * \param out final md5 output value |
| 196 | */ |
| 197 | static int sha1_final(struct shash_desc *desc, u8 *out) |
| 198 | { |
| 199 | struct sha1_ctx *sctx = shash_desc_ctx(desc); |
| 200 | u32 index, padlen; |
| 201 | u64 t; |
| 202 | u8 bits[8] = { 0, }; |
| 203 | static const u8 padding[64] = { 0x80, }; |
| 204 | volatile struct deu_hash_t *hashs = (struct deu_hash_t *) HASH_START; |
| 205 | unsigned long flag; |
| 206 | |
| 207 | t = sctx->count; |
| 208 | bits[7] = 0xff & t; |
| 209 | t >>= 8; |
| 210 | bits[6] = 0xff & t; |
| 211 | t >>= 8; |
| 212 | bits[5] = 0xff & t; |
| 213 | t >>= 8; |
| 214 | bits[4] = 0xff & t; |
| 215 | t >>= 8; |
| 216 | bits[3] = 0xff & t; |
| 217 | t >>= 8; |
| 218 | bits[2] = 0xff & t; |
| 219 | t >>= 8; |
| 220 | bits[1] = 0xff & t; |
| 221 | t >>= 8; |
| 222 | bits[0] = 0xff & t; |
| 223 | |
| 224 | /* Pad out to 56 mod 64 */ |
| 225 | index = (sctx->count >> 3) & 0x3f; |
| 226 | padlen = (index < 56) ? (56 - index) : ((64 + 56) - index); |
| 227 | sha1_update (desc, padding, padlen); |
| 228 | |
| 229 | /* Append length */ |
| 230 | sha1_update (desc, bits, sizeof bits); |
| 231 | |
| 232 | CRTCL_SECT_START; |
| 233 | |
| 234 | *((u32 *) out + 0) = hashs->D1R; |
| 235 | *((u32 *) out + 1) = hashs->D2R; |
| 236 | *((u32 *) out + 2) = hashs->D3R; |
| 237 | *((u32 *) out + 3) = hashs->D4R; |
| 238 | *((u32 *) out + 4) = hashs->D5R; |
| 239 | |
| 240 | CRTCL_SECT_END; |
| 241 | |
| 242 | // Wipe context |
| 243 | memset (sctx, 0, sizeof *sctx); |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * \brief SHA1 function mappings |
| 250 | */ |
| 251 | static struct shash_alg ifxdeu_sha1_alg = { |
| 252 | .digestsize = SHA1_DIGEST_SIZE, |
| 253 | .init = sha1_init, |
| 254 | .update = sha1_update, |
| 255 | .final = sha1_final, |
| 256 | .descsize = sizeof(struct sha1_ctx), |
| 257 | .statesize = sizeof(struct sha1_state), |
| 258 | .base = { |
| 259 | .cra_name = "sha1", |
| 260 | .cra_driver_name= "ifxdeu-sha1", |
| 261 | .cra_flags = CRYPTO_ALG_TYPE_DIGEST, |
| 262 | .cra_blocksize = SHA1_HMAC_BLOCK_SIZE, |
| 263 | .cra_module = THIS_MODULE, |
| 264 | } |
| 265 | }; |
| 266 | |
| 267 | |
| 268 | /*! \fn int __init ifxdeu_init_sha1 (void) |
| 269 | * \ingroup IFX_SHA1_FUNCTIONS |
| 270 | * \brief initialize sha1 driver |
| 271 | */ |
| 272 | int __init ifxdeu_init_sha1 (void) |
| 273 | { |
| 274 | int ret = -ENOSYS; |
| 275 | |
| 276 | |
| 277 | if ((ret = crypto_register_shash(&ifxdeu_sha1_alg))) |
| 278 | goto sha1_err; |
| 279 | |
| 280 | CRTCL_SECT_INIT; |
| 281 | |
| 282 | printk (KERN_NOTICE "IFX DEU SHA1 initialized%s.\n", disable_deudma ? "" : " (DMA)"); |
| 283 | return ret; |
| 284 | |
| 285 | sha1_err: |
| 286 | printk(KERN_ERR "IFX DEU SHA1 initialization failed!\n"); |
| 287 | return ret; |
| 288 | } |
| 289 | |
| 290 | /*! \fn void __exit ifxdeu_fini_sha1 (void) |
| 291 | * \ingroup IFX_SHA1_FUNCTIONS |
| 292 | * \brief unregister sha1 driver |
| 293 | */ |
| 294 | void __exit ifxdeu_fini_sha1 (void) |
| 295 | { |
| 296 | crypto_unregister_shash(&ifxdeu_sha1_alg); |
| 297 | |
| 298 | |
| 299 | } |
| 300 | |
| 301 | |
| 302 | |
