Prakash Dhavali | 7090c5f | 2015-11-02 17:55:19 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2014-2015 The Linux Foundation. All rights reserved. |
| 3 | * |
| 4 | * Previously licensed under the ISC license by Qualcomm Atheros, Inc. |
| 5 | * |
| 6 | * |
| 7 | * Permission to use, copy, modify, and/or distribute this software for |
| 8 | * any purpose with or without fee is hereby granted, provided that the |
| 9 | * above copyright notice and this permission notice appear in all |
| 10 | * copies. |
| 11 | * |
| 12 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL |
| 13 | * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED |
| 14 | * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE |
| 15 | * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL |
| 16 | * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 17 | * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 18 | * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 19 | * PERFORMANCE OF THIS SOFTWARE. |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * This file was originally distributed by Qualcomm Atheros, Inc. |
| 24 | * under proprietary terms before Copyright ownership was assigned |
| 25 | * to the Linux Foundation. |
| 26 | */ |
| 27 | |
| 28 | /*============================================================================ |
| 29 | FILE: cds_utils.c |
| 30 | |
| 31 | OVERVIEW: This source file contains definitions for CDS crypto APIs |
| 32 | The four APIs mentioned in this file are used for |
| 33 | initializing, and de-initializing a crypto context, and |
| 34 | obtaining truly random data (for keys), as well as |
| 35 | SHA1 HMAC, and AES encrypt and decrypt routines. |
| 36 | |
| 37 | The routines include: |
| 38 | cds_crypto_init() - Initializes Crypto module |
| 39 | cds_crypto_deinit() - De-initializes Crypto module |
| 40 | cds_rand_get_bytes() - Generates random byte |
| 41 | cds_sha1_hmac_str() - Generate the HMAC-SHA1 of a string given a key |
| 42 | cds_encrypt_aes() - Generate AES Encrypted byte stream |
| 43 | cds_decrypt_aes() - Decrypts an AES Encrypted byte stream |
| 44 | |
| 45 | DEPENDENCIES: |
| 46 | ============================================================================*/ |
| 47 | |
| 48 | /*---------------------------------------------------------------------------- |
| 49 | * Include Files |
| 50 | * -------------------------------------------------------------------------*/ |
| 51 | |
| 52 | #include "cdf_trace.h" |
| 53 | #include "cds_utils.h" |
| 54 | #include "cdf_memory.h" |
| 55 | #include "cds_crypto.h" |
| 56 | |
| 57 | #include <linux/err.h> |
| 58 | #include <linux/random.h> |
| 59 | #include <linux/crypto.h> |
| 60 | #include <linux/scatterlist.h> |
| 61 | #include <linux/completion.h> |
| 62 | #include <linux/ieee80211.h> |
| 63 | #include <crypto/hash.h> |
| 64 | #include <crypto/aes.h> |
| 65 | |
| 66 | #include "cds_ieee80211_common.h" |
| 67 | /*---------------------------------------------------------------------------- |
| 68 | * Preprocessor Definitions and Constants |
| 69 | * -------------------------------------------------------------------------*/ |
| 70 | #define AAD_LEN 20 |
| 71 | #define IV_SIZE_AES_128 16 |
| 72 | #define CMAC_IPN_LEN 6 |
| 73 | #define CMAC_TLEN 8 /* CMAC TLen = 64 bits (8 octets) */ |
| 74 | |
| 75 | /*---------------------------------------------------------------------------- |
| 76 | * Type Declarations |
| 77 | * -------------------------------------------------------------------------*/ |
| 78 | /*---------------------------------------------------------------------------- |
| 79 | * Global Data Definitions |
| 80 | * -------------------------------------------------------------------------*/ |
| 81 | /*---------------------------------------------------------------------------- |
| 82 | * Static Variable Definitions |
| 83 | * -------------------------------------------------------------------------*/ |
| 84 | |
| 85 | /*---------------------------------------------------------------------------- |
| 86 | Function Definitions and Documentation |
| 87 | * -------------------------------------------------------------------------*/ |
| 88 | #ifdef CONFIG_ICNSS |
| 89 | #ifdef WLAN_FEATURE_11W |
| 90 | static inline void xor_128(const u8 *a, const u8 *b, u8 *out) |
| 91 | { |
| 92 | u8 i; |
| 93 | |
| 94 | for (i = 0; i < AES_BLOCK_SIZE; i++) |
| 95 | out[i] = a[i] ^ b[i]; |
| 96 | } |
| 97 | |
| 98 | static inline void leftshift_onebit(const u8 *input, u8 *output) |
| 99 | { |
| 100 | int i, overflow = 0; |
| 101 | |
| 102 | for (i = (AES_BLOCK_SIZE - 1); i >= 0; i--) { |
| 103 | output[i] = input[i] << 1; |
| 104 | output[i] |= overflow; |
| 105 | overflow = (input[i] & 0x80) ? 1 : 0; |
| 106 | } |
| 107 | return; |
| 108 | } |
| 109 | |
| 110 | static void generate_subkey(struct crypto_cipher *tfm, u8 *k1, u8 *k2) |
| 111 | { |
| 112 | u8 l[AES_BLOCK_SIZE], tmp[AES_BLOCK_SIZE]; |
| 113 | u8 const_rb[AES_BLOCK_SIZE] = { |
| 114 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 115 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x87 |
| 116 | }; |
| 117 | u8 const_zero[AES_BLOCK_SIZE] = { |
| 118 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 119 | 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 |
| 120 | }; |
| 121 | |
| 122 | crypto_cipher_encrypt_one(tfm, l, const_zero); |
| 123 | |
| 124 | if ((l[0] & 0x80) == 0) { /* If MSB(l) = 0, then k1 = l << 1 */ |
| 125 | leftshift_onebit(l, k1); |
| 126 | } else { /* Else k1 = ( l << 1 ) (+) Rb */ |
| 127 | leftshift_onebit(l, tmp); |
| 128 | xor_128(tmp, const_rb, k1); |
| 129 | } |
| 130 | |
| 131 | if ((k1[0] & 0x80) == 0) { |
| 132 | leftshift_onebit(k1, k2); |
| 133 | } else { |
| 134 | leftshift_onebit(k1, tmp); |
| 135 | xor_128(tmp, const_rb, k2); |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | static inline void padding(u8 *lastb, u8 *pad, u16 length) |
| 140 | { |
| 141 | u8 j; |
| 142 | |
| 143 | /* original last block */ |
| 144 | for (j = 0; j < AES_BLOCK_SIZE; j++) { |
| 145 | if (j < length) |
| 146 | pad[j] = lastb[j]; |
| 147 | else if (j == length) |
| 148 | pad[j] = 0x80; |
| 149 | else |
| 150 | pad[j] = 0x00; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | static void cds_cmac_calc_mic(struct crypto_cipher *tfm, |
| 155 | u8 *m, u16 length, u8 *mac) |
| 156 | { |
| 157 | u8 x[AES_BLOCK_SIZE], y[AES_BLOCK_SIZE]; |
| 158 | u8 m_last[AES_BLOCK_SIZE], padded[AES_BLOCK_SIZE]; |
| 159 | u8 k1[AES_KEYSIZE_128], k2[AES_KEYSIZE_128]; |
| 160 | int cmpBlk; |
| 161 | int i, nBlocks = (length + 15) / AES_BLOCK_SIZE; |
| 162 | |
| 163 | generate_subkey(tfm, k1, k2); |
| 164 | |
| 165 | if (nBlocks == 0) { |
| 166 | nBlocks = 1; |
| 167 | cmpBlk = 0; |
| 168 | } else { |
| 169 | cmpBlk = ((length % AES_BLOCK_SIZE) == 0) ? 1 : 0; |
| 170 | } |
| 171 | |
| 172 | if (cmpBlk) { /* Last block is complete block */ |
| 173 | xor_128(&m[AES_BLOCK_SIZE * (nBlocks - 1)], k1, m_last); |
| 174 | } else { /* Last block is not complete block */ |
| 175 | padding(&m[AES_BLOCK_SIZE * (nBlocks - 1)], padded, |
| 176 | length % AES_BLOCK_SIZE); |
| 177 | xor_128(padded, k2, m_last); |
| 178 | } |
| 179 | |
| 180 | for (i = 0; i < AES_BLOCK_SIZE; i++) |
| 181 | x[i] = 0; |
| 182 | |
| 183 | for (i = 0; i < (nBlocks - 1); i++) { |
| 184 | xor_128(x, &m[AES_BLOCK_SIZE * i], y); /* y = Mi (+) x */ |
| 185 | crypto_cipher_encrypt_one(tfm, x, y); /* x = AES-128(KEY, y) */ |
| 186 | } |
| 187 | |
| 188 | xor_128(x, m_last, y); |
| 189 | crypto_cipher_encrypt_one(tfm, x, y); |
| 190 | |
| 191 | memcpy(mac, x, CMAC_TLEN); |
| 192 | } |
| 193 | #endif |
| 194 | #endif |
| 195 | |
| 196 | /*-------------------------------------------------------------------------- |
| 197 | |
| 198 | \brief cds_crypto_init() - Initializes Crypto module |
| 199 | |
| 200 | The cds_crypto_init() function initializes Crypto module. |
| 201 | |
| 202 | \param phCryptProv - pointer to the Crypt handle |
| 203 | |
| 204 | \return CDF_STATUS_SUCCESS - Successfully generated random memory. |
| 205 | |
| 206 | CDF_STATUS_E_FAULT - pbBuf is an invalid pointer. |
| 207 | |
| 208 | CDF_STATUS_E_FAILURE - default return value if it fails due to |
| 209 | unknown reasons |
| 210 | |
| 211 | ***CDF_STATUS_E_RESOURCES - System resources (other than memory) |
| 212 | are unavailable |
| 213 | \sa |
| 214 | |
| 215 | ( *** return value not considered yet ) |
| 216 | --------------------------------------------------------------------------*/ |
| 217 | CDF_STATUS cds_crypto_init(uint32_t *phCryptProv) |
| 218 | { |
| 219 | CDF_STATUS uResult = CDF_STATUS_E_FAILURE; |
| 220 | |
| 221 | /* This implementation doesn't require a crypto context */ |
| 222 | *phCryptProv = 0; |
| 223 | uResult = CDF_STATUS_SUCCESS; |
| 224 | return (uResult); |
| 225 | } |
| 226 | |
| 227 | CDF_STATUS cds_crypto_deinit(uint32_t hCryptProv) |
| 228 | { |
| 229 | CDF_STATUS uResult = CDF_STATUS_E_FAILURE; |
| 230 | |
| 231 | /* CryptReleaseContext succeeded */ |
| 232 | uResult = CDF_STATUS_SUCCESS; |
| 233 | |
| 234 | return (uResult); |
| 235 | } |
| 236 | |
| 237 | /*-------------------------------------------------------------------------- |
| 238 | |
| 239 | \brief cds_rand_get_bytes() - Generates random byte |
| 240 | |
| 241 | The cds_rand_get_bytes() function generate random bytes. |
| 242 | |
| 243 | Buffer should be allocated before calling cds_rand_get_bytes(). |
| 244 | |
| 245 | Attempting to initialize an already initialized lock results in |
| 246 | a failure. |
| 247 | |
| 248 | \param lock - pointer to the opaque lock object to initialize |
| 249 | |
| 250 | \return CDF_STATUS_SUCCESS - Successfully generated random memory. |
| 251 | |
| 252 | CDF_STATUS_E_FAULT - pbBuf is an invalid pointer. |
| 253 | |
| 254 | CDF_STATUS_E_FAILURE - default return value if it fails due to |
| 255 | unknown reasons |
| 256 | |
| 257 | ***CDF_STATUS_E_RESOURCES - System resources (other than memory) |
| 258 | are unavailable |
| 259 | \sa |
| 260 | |
| 261 | ( *** return value not considered yet ) |
| 262 | --------------------------------------------------------------------------*/ |
| 263 | CDF_STATUS |
| 264 | cds_rand_get_bytes(uint32_t cryptHandle, uint8_t *pbBuf, uint32_t numBytes) |
| 265 | { |
| 266 | CDF_STATUS uResult = CDF_STATUS_E_FAILURE; |
| 267 | |
| 268 | /* check for invalid pointer */ |
| 269 | if (NULL == pbBuf) { |
| 270 | uResult = CDF_STATUS_E_FAULT; |
| 271 | return (uResult); |
| 272 | } |
| 273 | |
| 274 | get_random_bytes(pbBuf, numBytes); |
| 275 | /* "Random sequence generated." */ |
| 276 | uResult = CDF_STATUS_SUCCESS; |
| 277 | return (uResult); |
| 278 | } |
| 279 | |
| 280 | #ifdef WLAN_FEATURE_11W |
| 281 | uint8_t cds_get_mmie_size() |
| 282 | { |
| 283 | return sizeof(struct ieee80211_mmie); |
| 284 | } |
| 285 | |
| 286 | /*-------------------------------------------------------------------------- |
| 287 | |
| 288 | \brief cds_increase_seq() - Increase the IPN aka Sequence number by one unit |
| 289 | |
| 290 | The cds_increase_seq() function increases the IPN by one unit. |
| 291 | |
| 292 | \param ipn - pointer to the IPN aka Sequence number [6 bytes] |
| 293 | |
| 294 | --------------------------------------------------------------------------*/ |
| 295 | static void cds_increase_seq(uint8_t *ipn) |
| 296 | { |
| 297 | uint64_t value = 0; |
| 298 | if (ipn) { |
| 299 | value = (0xffffffffffff) & (*((uint64_t *) ipn)); |
| 300 | value = value + 1; |
| 301 | cdf_mem_copy(ipn, &value, IEEE80211_MMIE_IPNLEN); |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /*-------------------------------------------------------------------------- |
| 306 | |
| 307 | \brief cds_attach_mmie() - attches the complete MMIE at the end of frame |
| 308 | |
| 309 | The cds_attach_mmie() calculates the entire MMIE and attaches at the end |
| 310 | of Broadcast/Multicast robust management frames. |
| 311 | |
| 312 | \param igtk - pointer group key which will be used to calculate |
| 313 | the 8 byte MIC. |
| 314 | \param ipn - pointer ipn, it is also known as sequence number |
| 315 | \param key_id - key identication number |
| 316 | \param frm - pointer to the start of the frame. |
| 317 | \param efrm - pointer to the end of the frame. |
| 318 | \param frmLen - size of the entire frame. |
| 319 | |
| 320 | \return - this function will return true on success and false on |
| 321 | failure. |
| 322 | |
| 323 | --------------------------------------------------------------------------*/ |
| 324 | |
| 325 | bool |
| 326 | cds_attach_mmie(uint8_t *igtk, uint8_t *ipn, uint16_t key_id, |
| 327 | uint8_t *frm, uint8_t *efrm, uint16_t frmLen) |
| 328 | { |
| 329 | struct ieee80211_mmie *mmie; |
| 330 | struct ieee80211_frame *wh; |
| 331 | uint8_t aad[AAD_LEN], mic[CMAC_TLEN], *input = NULL; |
| 332 | uint8_t previous_ipn[IEEE80211_MMIE_IPNLEN] = { 0 }; |
| 333 | uint16_t nBytes = 0; |
| 334 | int ret = 0; |
| 335 | struct crypto_cipher *tfm; |
| 336 | |
| 337 | /* This is how received frame look like |
| 338 | * |
| 339 | * <------------frmLen----------------------------> |
| 340 | * |
| 341 | * +---------------+----------------------+-------+ |
| 342 | * | 802.11 HEADER | Management framebody | MMIE | |
| 343 | * +---------------+----------------------+-------+ |
| 344 | * ^ |
| 345 | * | |
| 346 | * efrm |
| 347 | * This is how MMIE from above frame look like |
| 348 | * |
| 349 | * |
| 350 | * <------------ 18 Bytes-----------------------------> |
| 351 | * +--------+---------+---------+-----------+---------+ |
| 352 | * |Element | Length | Key id | IPN | MIC | |
| 353 | * | id | | | | | |
| 354 | * +--------+---------+---------+-----------+---------+ |
| 355 | * Octet 1 1 2 6 8 |
| 356 | * |
| 357 | */ |
| 358 | |
| 359 | /* Check if frame is invalid length */ |
| 360 | if (((efrm - frm) != frmLen) || (frmLen < sizeof(*wh))) { |
| 361 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 362 | "%s: Invalid frame length", __func__); |
| 363 | return false; |
| 364 | } |
| 365 | mmie = (struct ieee80211_mmie *)(efrm - sizeof(*mmie)); |
| 366 | |
| 367 | /* Copy Element id */ |
| 368 | mmie->element_id = IEEE80211_ELEMID_MMIE; |
| 369 | |
| 370 | /* Copy Length */ |
| 371 | mmie->length = sizeof(*mmie) - 2; |
| 372 | |
| 373 | /* Copy Key id */ |
| 374 | mmie->key_id = key_id; |
| 375 | |
| 376 | /* |
| 377 | * In case of error, revert back to original IPN |
| 378 | * to do that copy the original IPN into previous_ipn |
| 379 | */ |
| 380 | cdf_mem_copy(&previous_ipn[0], ipn, IEEE80211_MMIE_IPNLEN); |
| 381 | cds_increase_seq(ipn); |
| 382 | cdf_mem_copy(mmie->sequence_number, ipn, IEEE80211_MMIE_IPNLEN); |
| 383 | |
| 384 | /* |
| 385 | * Calculate MIC and then copy |
| 386 | */ |
| 387 | tfm = cds_crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
| 388 | if (IS_ERR(tfm)) { |
| 389 | ret = PTR_ERR(tfm); |
| 390 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 391 | "%s: crypto_alloc_cipher failed (%d)", __func__, ret); |
| 392 | goto err_tfm; |
| 393 | } |
| 394 | |
| 395 | ret = crypto_cipher_setkey(tfm, igtk, AES_KEYSIZE_128); |
| 396 | if (ret) { |
| 397 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 398 | "%s: crypto_cipher_setkey failed (%d)", __func__, |
| 399 | ret); |
| 400 | goto err_tfm; |
| 401 | } |
| 402 | |
| 403 | /* Construct AAD */ |
| 404 | wh = (struct ieee80211_frame *)frm; |
| 405 | |
| 406 | /* Generate BIP AAD: FC(masked) || A1 || A2 || A3 */ |
| 407 | |
| 408 | /* FC type/subtype */ |
| 409 | aad[0] = wh->i_fc[0]; |
| 410 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
| 411 | aad[1] = wh->i_fc[1] & ~(IEEE80211_FC1_RETRY | IEEE80211_FC1_PWR_MGT | |
| 412 | IEEE80211_FC1_MORE_DATA); |
| 413 | /* A1 || A2 || A3 */ |
| 414 | cdf_mem_copy(aad + 2, wh->i_addr_all, 3 * IEEE80211_ADDR_LEN); |
| 415 | |
| 416 | /* MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) */ |
| 417 | nBytes = AAD_LEN + (frmLen - sizeof(struct ieee80211_frame)); |
| 418 | input = (uint8_t *) cdf_mem_malloc(nBytes); |
| 419 | if (NULL == input) { |
| 420 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 421 | "%s: Memory allocation failed", __func__); |
| 422 | ret = CDF_STATUS_E_NOMEM; |
| 423 | goto err_tfm; |
| 424 | } |
| 425 | |
| 426 | /* |
| 427 | * Copy the AAD, Management frame body, and |
| 428 | * MMIE with 8 bit MIC zeroed out |
| 429 | */ |
| 430 | cdf_mem_zero(input, nBytes); |
| 431 | cdf_mem_copy(input, aad, AAD_LEN); |
| 432 | /* Copy Management Frame Body and MMIE without MIC */ |
| 433 | cdf_mem_copy(input + AAD_LEN, |
| 434 | (uint8_t *) (efrm - |
| 435 | (frmLen - sizeof(struct ieee80211_frame))), |
| 436 | nBytes - AAD_LEN - CMAC_TLEN); |
| 437 | |
| 438 | cds_cmac_calc_mic(tfm, input, nBytes, mic); |
| 439 | cdf_mem_free(input); |
| 440 | |
| 441 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_INFO_HIGH, |
| 442 | "CMAC(T)= %02X %02X %02X %02X %02X %02X %02X %02X", |
| 443 | mic[0], mic[1], mic[2], mic[3], |
| 444 | mic[4], mic[5], mic[6], mic[7]); |
| 445 | cdf_mem_copy(mmie->mic, mic, IEEE80211_MMIE_MICLEN); |
| 446 | |
| 447 | err_tfm: |
| 448 | if (ret) { |
| 449 | cdf_mem_copy(ipn, previous_ipn, IEEE80211_MMIE_IPNLEN); |
| 450 | } |
| 451 | |
| 452 | if (tfm) |
| 453 | cds_crypto_free_cipher(tfm); |
| 454 | return !ret ? true : false; |
| 455 | } |
| 456 | |
| 457 | bool |
| 458 | cds_is_mmie_valid(uint8_t *igtk, uint8_t *ipn, uint8_t *frm, uint8_t *efrm) |
| 459 | { |
| 460 | struct ieee80211_mmie *mmie; |
| 461 | struct ieee80211_frame *wh; |
| 462 | uint8_t *rx_ipn, aad[AAD_LEN], mic[CMAC_TLEN], *input; |
| 463 | uint16_t nBytes = 0; |
| 464 | int ret = 0; |
| 465 | struct crypto_cipher *tfm; |
| 466 | |
| 467 | /* Check if frame is invalid length */ |
| 468 | if ((efrm < frm) || ((efrm - frm) < sizeof(*wh))) { |
| 469 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 470 | "Invalid frame length"); |
| 471 | return false; |
| 472 | } |
| 473 | |
| 474 | mmie = (struct ieee80211_mmie *)(efrm - sizeof(*mmie)); |
| 475 | |
| 476 | /* Check Element ID */ |
| 477 | if ((mmie->element_id != IEEE80211_ELEMID_MMIE) || |
| 478 | (mmie->length != (sizeof(*mmie) - 2))) { |
| 479 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 480 | "IE is not Mgmt MIC IE or Invalid length"); |
| 481 | /* IE is not Mgmt MIC IE or invalid length */ |
| 482 | return false; |
| 483 | } |
| 484 | |
| 485 | /* Validate IPN */ |
| 486 | rx_ipn = mmie->sequence_number; |
| 487 | if (OS_MEMCMP(rx_ipn, ipn, CMAC_IPN_LEN) <= 0) { |
| 488 | /* Replay error */ |
| 489 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 490 | "Replay error mmie ipn %02X %02X %02X %02X %02X %02X" |
| 491 | " drvr ipn %02X %02X %02X %02X %02X %02X", |
| 492 | rx_ipn[0], rx_ipn[1], rx_ipn[2], rx_ipn[3], rx_ipn[4], |
| 493 | rx_ipn[5], ipn[0], ipn[1], ipn[2], ipn[3], ipn[4], |
| 494 | ipn[5]); |
| 495 | return false; |
| 496 | } |
| 497 | tfm = cds_crypto_alloc_cipher("aes", 0, CRYPTO_ALG_ASYNC); |
| 498 | if (IS_ERR(tfm)) { |
| 499 | ret = PTR_ERR(tfm); |
| 500 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 501 | "crypto_alloc_cipher failed (%d)", ret); |
| 502 | goto err_tfm; |
| 503 | } |
| 504 | |
| 505 | ret = crypto_cipher_setkey(tfm, igtk, AES_KEYSIZE_128); |
| 506 | if (ret) { |
| 507 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 508 | "crypto_cipher_setkey failed (%d)", ret); |
| 509 | goto err_tfm; |
| 510 | } |
| 511 | |
| 512 | /* Construct AAD */ |
| 513 | wh = (struct ieee80211_frame *)frm; |
| 514 | |
| 515 | /* Generate BIP AAD: FC(masked) || A1 || A2 || A3 */ |
| 516 | |
| 517 | /* FC type/subtype */ |
| 518 | aad[0] = wh->i_fc[0]; |
| 519 | /* Mask FC Retry, PwrMgt, MoreData flags to zero */ |
| 520 | aad[1] = wh->i_fc[1] & ~(IEEE80211_FC1_RETRY | IEEE80211_FC1_PWR_MGT | |
| 521 | IEEE80211_FC1_MORE_DATA); |
| 522 | /* A1 || A2 || A3 */ |
| 523 | cdf_mem_copy(aad + 2, wh->i_addr_all, 3 * IEEE80211_ADDR_LEN); |
| 524 | |
| 525 | /* MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64) */ |
| 526 | nBytes = AAD_LEN + (efrm - (uint8_t *) (wh + 1)); |
| 527 | input = (uint8_t *) cdf_mem_malloc(nBytes); |
| 528 | if (NULL == input) { |
| 529 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 530 | "Memory allocation failed"); |
| 531 | ret = CDF_STATUS_E_NOMEM; |
| 532 | goto err_tfm; |
| 533 | } |
| 534 | |
| 535 | /* Copy the AAD, MMIE with 8 bit MIC zeroed out */ |
| 536 | cdf_mem_zero(input, nBytes); |
| 537 | cdf_mem_copy(input, aad, AAD_LEN); |
| 538 | cdf_mem_copy(input + AAD_LEN, (uint8_t *) (wh + 1), |
| 539 | nBytes - AAD_LEN - CMAC_TLEN); |
| 540 | |
| 541 | cds_cmac_calc_mic(tfm, input, nBytes, mic); |
| 542 | cdf_mem_free(input); |
| 543 | |
| 544 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 545 | "CMAC(T)= %02X %02X %02X %02X %02X %02X %02X %02X", |
| 546 | mic[0], mic[1], mic[2], mic[3], |
| 547 | mic[4], mic[5], mic[6], mic[7]); |
| 548 | |
| 549 | if (OS_MEMCMP(mic, mmie->mic, CMAC_TLEN) != 0) { |
| 550 | /* MMIE MIC mismatch */ |
| 551 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 552 | "BC/MC MGMT frame MMIE MIC check Failed" |
| 553 | " rmic %02X %02X %02X %02X %02X %02X %02X %02X" |
| 554 | " cmic %02X %02X %02X %02X %02X %02X %02X %02X", |
| 555 | mmie->mic[0], mmie->mic[1], mmie->mic[2], |
| 556 | mmie->mic[3], mmie->mic[4], mmie->mic[5], |
| 557 | mmie->mic[6], mmie->mic[7], mic[0], mic[1], mic[2], |
| 558 | mic[3], mic[4], mic[5], mic[6], mic[7]); |
| 559 | return false; |
| 560 | } |
| 561 | |
| 562 | /* Update IPN */ |
| 563 | cdf_mem_copy(ipn, rx_ipn, CMAC_IPN_LEN); |
| 564 | |
| 565 | err_tfm: |
| 566 | if (tfm) |
| 567 | cds_crypto_free_cipher(tfm); |
| 568 | |
| 569 | return !ret ? true : false; |
| 570 | } |
| 571 | |
| 572 | #endif /* WLAN_FEATURE_11W */ |
| 573 | /** |
| 574 | * cds_sha1_hmac_str |
| 575 | * |
| 576 | * FUNCTION: |
| 577 | * Generate the HMAC-SHA1 of a string given a key. |
| 578 | * |
| 579 | * LOGIC: |
| 580 | * Standard HMAC processing from RFC 2104. The code is provided in the |
| 581 | * appendix of the RFC. |
| 582 | * |
| 583 | * ASSUMPTIONS: |
| 584 | * The RFC is correct. |
| 585 | * |
| 586 | * @param text text to be hashed |
| 587 | * @param textLen length of text |
| 588 | * @param key key to use for HMAC |
| 589 | * @param keyLen length of key |
| 590 | * @param digest holds resultant SHA1 HMAC (20B) |
| 591 | * |
| 592 | * @return CDF_STATUS_SUCCSS if the operation succeeds |
| 593 | * |
| 594 | */ |
| 595 | |
| 596 | struct hmac_sha1_result { |
| 597 | struct completion completion; |
| 598 | int err; |
| 599 | }; |
| 600 | |
| 601 | static void hmac_sha1_complete(struct crypto_async_request *req, int err) |
| 602 | { |
| 603 | struct hmac_sha1_result *r = req->data; |
| 604 | if (err == -EINPROGRESS) |
| 605 | return; |
| 606 | r->err = err; |
| 607 | complete(&r->completion); |
| 608 | } |
| 609 | |
| 610 | int |
| 611 | hmac_sha1(uint8_t *key, uint8_t ksize, char *plaintext, uint8_t psize, |
| 612 | uint8_t *output, uint8_t outlen) |
| 613 | { |
| 614 | int ret = 0; |
| 615 | struct crypto_ahash *tfm; |
| 616 | struct scatterlist sg; |
| 617 | struct ahash_request *req; |
| 618 | struct hmac_sha1_result tresult; |
| 619 | void *hash_buff = NULL; |
| 620 | |
| 621 | unsigned char hash_result[64]; |
| 622 | int i; |
| 623 | |
| 624 | memset(output, 0, outlen); |
| 625 | |
| 626 | init_completion(&tresult.completion); |
| 627 | |
| 628 | tfm = cds_crypto_alloc_ahash("hmac(sha1)", CRYPTO_ALG_TYPE_AHASH, |
| 629 | CRYPTO_ALG_TYPE_AHASH_MASK); |
| 630 | if (IS_ERR(tfm)) { |
| 631 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 632 | "crypto_alloc_ahash failed"); |
| 633 | ret = PTR_ERR(tfm); |
| 634 | goto err_tfm; |
| 635 | } |
| 636 | |
| 637 | req = ahash_request_alloc(tfm, GFP_KERNEL); |
| 638 | if (!req) { |
| 639 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 640 | "failed to allocate request for hmac(sha1)"); |
| 641 | ret = -ENOMEM; |
| 642 | goto err_req; |
| 643 | } |
| 644 | |
| 645 | ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
| 646 | hmac_sha1_complete, &tresult); |
| 647 | |
| 648 | hash_buff = kzalloc(psize, GFP_KERNEL); |
| 649 | if (!hash_buff) { |
| 650 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 651 | "failed to kzalloc hash_buff"); |
| 652 | ret = -ENOMEM; |
| 653 | goto err_hash_buf; |
| 654 | } |
| 655 | |
| 656 | memset(hash_result, 0, 64); |
| 657 | memcpy(hash_buff, plaintext, psize); |
| 658 | sg_init_one(&sg, hash_buff, psize); |
| 659 | |
| 660 | if (ksize) { |
| 661 | crypto_ahash_clear_flags(tfm, ~0); |
| 662 | ret = cds_crypto_ahash_setkey(tfm, key, ksize); |
| 663 | if (ret) { |
| 664 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 665 | "crypto_ahash_setkey failed"); |
| 666 | goto err_setkey; |
| 667 | } |
| 668 | } |
| 669 | |
| 670 | ahash_request_set_crypt(req, &sg, hash_result, psize); |
| 671 | ret = cds_crypto_ahash_digest(req); |
| 672 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, "ret 0x%x", ret); |
| 673 | |
| 674 | switch (ret) { |
| 675 | case 0: |
| 676 | for (i = 0; i < outlen; i++) |
| 677 | output[i] = hash_result[i]; |
| 678 | break; |
| 679 | case -EINPROGRESS: |
| 680 | case -EBUSY: |
| 681 | ret = wait_for_completion_interruptible(&tresult.completion); |
| 682 | if (!ret && !tresult.err) { |
| 683 | INIT_COMPLETION(tresult.completion); |
| 684 | break; |
| 685 | } else { |
| 686 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 687 | "wait_for_completion_interruptible failed"); |
| 688 | if (!ret) |
| 689 | ret = tresult.err; |
| 690 | goto out; |
| 691 | } |
| 692 | default: |
| 693 | goto out; |
| 694 | } |
| 695 | |
| 696 | out: |
| 697 | err_setkey: |
| 698 | kfree(hash_buff); |
| 699 | err_hash_buf: |
| 700 | ahash_request_free(req); |
| 701 | err_req: |
| 702 | cds_crypto_free_ahash(tfm); |
| 703 | err_tfm: |
| 704 | return ret; |
| 705 | } |
| 706 | |
| 707 | CDF_STATUS cds_sha1_hmac_str(uint32_t cryptHandle, /* Handle */ |
| 708 | uint8_t *pText, /* pointer to data stream */ |
| 709 | uint32_t textLen, /* length of data stream */ |
| 710 | uint8_t *pKey, /* pointer to authentication key */ |
| 711 | uint32_t keyLen, /* length of authentication key */ |
| 712 | uint8_t digest[CDS_DIGEST_SHA1_SIZE]) |
| 713 | { /* caller digest to be filled in */ |
| 714 | int ret = 0; |
| 715 | |
| 716 | ret = hmac_sha1(pKey, /* uint8_t *key, */ |
| 717 | (uint8_t) keyLen, /* uint8_t ksize, */ |
| 718 | (char *)pText, /* char *plaintext, */ |
| 719 | (uint8_t) textLen, /* uint8_t psize, */ |
| 720 | digest, /* uint8_t *output, */ |
| 721 | CDS_DIGEST_SHA1_SIZE /* uint8_t outlen */ |
| 722 | ); |
| 723 | |
| 724 | if (ret != 0) { |
| 725 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 726 | "hmac_sha1() call failed"); |
| 727 | return CDF_STATUS_E_FAULT; |
| 728 | } |
| 729 | |
| 730 | return CDF_STATUS_SUCCESS; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * cds_md5_hmac_str |
| 735 | * |
| 736 | * FUNCTION: |
| 737 | * Generate the HMAC-MD5 of a string given a key. |
| 738 | * |
| 739 | * LOGIC: |
| 740 | * Standard HMAC processing from RFC 2104. The code is provided in the |
| 741 | * appendix of the RFC. |
| 742 | * |
| 743 | * ASSUMPTIONS: |
| 744 | * The RFC is correct. |
| 745 | * |
| 746 | * @param text text to be hashed |
| 747 | * @param textLen length of text |
| 748 | * @param key key to use for HMAC |
| 749 | * @param keyLen length of key |
| 750 | * @param digest holds resultant MD5 HMAC (20B) |
| 751 | * |
| 752 | * @return CDF_STATUS_SUCCSS if the operation succeeds |
| 753 | * |
| 754 | */ |
| 755 | struct hmac_md5_result { |
| 756 | struct completion completion; |
| 757 | int err; |
| 758 | }; |
| 759 | |
| 760 | static void hmac_md5_complete(struct crypto_async_request *req, int err) |
| 761 | { |
| 762 | struct hmac_md5_result *r = req->data; |
| 763 | if (err == -EINPROGRESS) |
| 764 | return; |
| 765 | r->err = err; |
| 766 | complete(&r->completion); |
| 767 | } |
| 768 | |
| 769 | int |
| 770 | hmac_md5(uint8_t *key, uint8_t ksize, char *plaintext, uint8_t psize, |
| 771 | uint8_t *output, uint8_t outlen) |
| 772 | { |
| 773 | int ret = 0; |
| 774 | struct crypto_ahash *tfm; |
| 775 | struct scatterlist sg; |
| 776 | struct ahash_request *req; |
| 777 | struct hmac_md5_result tresult = {.err = 0 }; |
| 778 | void *hash_buff = NULL; |
| 779 | |
| 780 | unsigned char hash_result[64]; |
| 781 | int i; |
| 782 | |
| 783 | memset(output, 0, outlen); |
| 784 | |
| 785 | init_completion(&tresult.completion); |
| 786 | |
| 787 | tfm = cds_crypto_alloc_ahash("hmac(md5)", CRYPTO_ALG_TYPE_AHASH, |
| 788 | CRYPTO_ALG_TYPE_AHASH_MASK); |
| 789 | if (IS_ERR(tfm)) { |
| 790 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 791 | "crypto_alloc_ahash failed"); |
| 792 | ret = PTR_ERR(tfm); |
| 793 | goto err_tfm; |
| 794 | } |
| 795 | |
| 796 | req = ahash_request_alloc(tfm, GFP_KERNEL); |
| 797 | if (!req) { |
| 798 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 799 | "failed to allocate request for hmac(md5)"); |
| 800 | ret = -ENOMEM; |
| 801 | goto err_req; |
| 802 | } |
| 803 | |
| 804 | ahash_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
| 805 | hmac_md5_complete, &tresult); |
| 806 | |
| 807 | hash_buff = kzalloc(psize, GFP_KERNEL); |
| 808 | if (!hash_buff) { |
| 809 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 810 | "failed to kzalloc hash_buff"); |
| 811 | ret = -ENOMEM; |
| 812 | goto err_hash_buf; |
| 813 | } |
| 814 | |
| 815 | memset(hash_result, 0, 64); |
| 816 | memcpy(hash_buff, plaintext, psize); |
| 817 | sg_init_one(&sg, hash_buff, psize); |
| 818 | |
| 819 | if (ksize) { |
| 820 | crypto_ahash_clear_flags(tfm, ~0); |
| 821 | ret = cds_crypto_ahash_setkey(tfm, key, ksize); |
| 822 | if (ret) { |
| 823 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 824 | "crypto_ahash_setkey failed"); |
| 825 | goto err_setkey; |
| 826 | } |
| 827 | } |
| 828 | |
| 829 | ahash_request_set_crypt(req, &sg, hash_result, psize); |
| 830 | ret = cds_crypto_ahash_digest(req); |
| 831 | |
| 832 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, "ret 0x%x", ret); |
| 833 | |
| 834 | switch (ret) { |
| 835 | case 0: |
| 836 | for (i = 0; i < outlen; i++) |
| 837 | output[i] = hash_result[i]; |
| 838 | break; |
| 839 | case -EINPROGRESS: |
| 840 | case -EBUSY: |
| 841 | ret = wait_for_completion_interruptible(&tresult.completion); |
| 842 | if (!ret && !tresult.err) { |
| 843 | INIT_COMPLETION(tresult.completion); |
| 844 | break; |
| 845 | } else { |
| 846 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 847 | "wait_for_completion_interruptible failed"); |
| 848 | if (!ret) |
| 849 | ret = tresult.err; |
| 850 | goto out; |
| 851 | } |
| 852 | default: |
| 853 | goto out; |
| 854 | } |
| 855 | |
| 856 | out: |
| 857 | err_setkey: |
| 858 | kfree(hash_buff); |
| 859 | err_hash_buf: |
| 860 | ahash_request_free(req); |
| 861 | err_req: |
| 862 | cds_crypto_free_ahash(tfm); |
| 863 | err_tfm: |
| 864 | return ret; |
| 865 | } |
| 866 | |
| 867 | CDF_STATUS cds_md5_hmac_str(uint32_t cryptHandle, /* Handle */ |
| 868 | uint8_t *pText, /* pointer to data stream */ |
| 869 | uint32_t textLen, /* length of data stream */ |
| 870 | uint8_t *pKey, /* pointer to authentication key */ |
| 871 | uint32_t keyLen, /* length of authentication key */ |
| 872 | uint8_t digest[CDS_DIGEST_MD5_SIZE]) |
| 873 | { /* caller digest to be filled in */ |
| 874 | int ret = 0; |
| 875 | |
| 876 | ret = hmac_md5(pKey, /* uint8_t *key, */ |
| 877 | (uint8_t) keyLen, /* uint8_t ksize, */ |
| 878 | (char *)pText, /* char *plaintext, */ |
| 879 | (uint8_t) textLen, /* uint8_t psize, */ |
| 880 | digest, /* uint8_t *output, */ |
| 881 | CDS_DIGEST_MD5_SIZE /* uint8_t outlen */ |
| 882 | ); |
| 883 | |
| 884 | if (ret != 0) { |
| 885 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 886 | "hmac_md5() call failed"); |
| 887 | return CDF_STATUS_E_FAULT; |
| 888 | } |
| 889 | |
| 890 | return CDF_STATUS_SUCCESS; |
| 891 | } |
| 892 | |
| 893 | struct ecb_aes_result { |
| 894 | struct completion completion; |
| 895 | int err; |
| 896 | }; |
| 897 | |
| 898 | static void ecb_aes_complete(struct crypto_async_request *req, int err) |
| 899 | { |
| 900 | struct ecb_aes_result *r = req->data; |
| 901 | if (err == -EINPROGRESS) |
| 902 | return; |
| 903 | r->err = err; |
| 904 | complete(&r->completion); |
| 905 | } |
| 906 | |
| 907 | /*-------------------------------------------------------------------------- |
| 908 | |
| 909 | \brief cds_encrypt_aes() - Generate AES Encrypted byte stream |
| 910 | |
| 911 | The cds_encrypt_aes() function generates the encrypted byte stream for given text. |
| 912 | |
| 913 | Buffer should be allocated before calling cds_rand_get_bytes(). |
| 914 | |
| 915 | Attempting to initialize an already initialized lock results in |
| 916 | a failure. |
| 917 | |
| 918 | \param lock - pointer to the opaque lock object to initialize |
| 919 | |
| 920 | \return CDF_STATUS_SUCCESS - Successfully generated random memory. |
| 921 | |
| 922 | CDF_STATUS_E_FAULT - pbBuf is an invalid pointer. |
| 923 | |
| 924 | CDF_STATUS_E_FAILURE - default return value if it fails due to |
| 925 | unknown reasons |
| 926 | |
| 927 | ***CDF_STATUS_E_RESOURCES - System resources (other than memory) |
| 928 | are unavailable |
| 929 | \sa |
| 930 | |
| 931 | ( *** return value not considered yet ) |
| 932 | --------------------------------------------------------------------------*/ |
| 933 | |
| 934 | CDF_STATUS cds_encrypt_aes(uint32_t cryptHandle, /* Handle */ |
| 935 | uint8_t *pPlainText, /* pointer to data stream */ |
| 936 | uint8_t *pCiphertext, uint8_t *pKey) |
| 937 | { /* pointer to authentication key */ |
| 938 | struct ecb_aes_result result; |
| 939 | struct ablkcipher_request *req; |
| 940 | struct crypto_ablkcipher *tfm; |
| 941 | int ret = 0; |
| 942 | char iv[IV_SIZE_AES_128]; |
| 943 | struct scatterlist sg_in; |
| 944 | struct scatterlist sg_out; |
| 945 | |
| 946 | init_completion(&result.completion); |
| 947 | |
| 948 | tfm = cds_crypto_alloc_ablkcipher("cbc(aes)", 0, 0); |
| 949 | if (IS_ERR(tfm)) { |
| 950 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 951 | "crypto_alloc_ablkcipher failed"); |
| 952 | ret = PTR_ERR(tfm); |
| 953 | goto err_tfm; |
| 954 | } |
| 955 | |
| 956 | req = ablkcipher_request_alloc(tfm, GFP_KERNEL); |
| 957 | if (!req) { |
| 958 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 959 | "Failed to allocate request for cbc(aes)"); |
| 960 | ret = -ENOMEM; |
| 961 | goto err_req; |
| 962 | } |
| 963 | |
| 964 | ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
| 965 | ecb_aes_complete, &result); |
| 966 | |
| 967 | crypto_ablkcipher_clear_flags(tfm, ~0); |
| 968 | |
| 969 | ret = crypto_ablkcipher_setkey(tfm, pKey, AES_KEYSIZE_128); |
| 970 | if (ret) { |
| 971 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 972 | "crypto_cipher_setkey failed"); |
| 973 | goto err_setkey; |
| 974 | } |
| 975 | |
| 976 | memset(iv, 0, IV_SIZE_AES_128); |
| 977 | |
| 978 | sg_init_one(&sg_in, pPlainText, AES_BLOCK_SIZE); |
| 979 | |
| 980 | sg_init_one(&sg_out, pCiphertext, AES_BLOCK_SIZE); |
| 981 | |
| 982 | ablkcipher_request_set_crypt(req, &sg_in, &sg_out, AES_BLOCK_SIZE, iv); |
| 983 | |
| 984 | crypto_ablkcipher_encrypt(req); |
| 985 | |
| 986 | /* ------------------------------------- */ |
| 987 | err_setkey: |
| 988 | cds_ablkcipher_request_free(req); |
| 989 | err_req: |
| 990 | cds_crypto_free_ablkcipher(tfm); |
| 991 | err_tfm: |
| 992 | /* return ret; */ |
| 993 | if (ret != 0) { |
| 994 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 995 | "%s() call failed", __func__); |
| 996 | return CDF_STATUS_E_FAULT; |
| 997 | } |
| 998 | |
| 999 | return CDF_STATUS_SUCCESS; |
| 1000 | } |
| 1001 | |
| 1002 | /*-------------------------------------------------------------------------- |
| 1003 | |
| 1004 | \brief cds_decrypt_aes() - Decrypts an AES Encrypted byte stream |
| 1005 | |
| 1006 | The cds_decrypt_aes() function decrypts the encrypted byte stream. |
| 1007 | |
| 1008 | Buffer should be allocated before calling cds_rand_get_bytes(). |
| 1009 | |
| 1010 | Attempting to initialize an already initialized lock results in |
| 1011 | a failure. |
| 1012 | |
| 1013 | \param lock - pointer to the opaque lock object to initialize |
| 1014 | |
| 1015 | \return CDF_STATUS_SUCCESS - Successfully generated random memory. |
| 1016 | |
| 1017 | CDF_STATUS_E_FAULT - pbBuf is an invalid pointer. |
| 1018 | |
| 1019 | CDF_STATUS_E_FAILURE - default return value if it fails due to |
| 1020 | unknown reasons |
| 1021 | |
| 1022 | ***CDF_STATUS_E_RESOURCES - System resources (other than memory) |
| 1023 | are unavailable |
| 1024 | \sa |
| 1025 | |
| 1026 | ( *** return value not considered yet ) |
| 1027 | --------------------------------------------------------------------------*/ |
| 1028 | |
| 1029 | CDF_STATUS cds_decrypt_aes(uint32_t cryptHandle, /* Handle */ |
| 1030 | uint8_t *pText, /* pointer to data stream */ |
| 1031 | uint8_t *pDecrypted, uint8_t *pKey) |
| 1032 | { /* pointer to authentication key */ |
| 1033 | /* CDF_STATUS uResult = CDF_STATUS_E_FAILURE; */ |
| 1034 | struct ecb_aes_result result; |
| 1035 | struct ablkcipher_request *req; |
| 1036 | struct crypto_ablkcipher *tfm; |
| 1037 | int ret = 0; |
| 1038 | char iv[IV_SIZE_AES_128]; |
| 1039 | struct scatterlist sg_in; |
| 1040 | struct scatterlist sg_out; |
| 1041 | |
| 1042 | init_completion(&result.completion); |
| 1043 | |
| 1044 | tfm = cds_crypto_alloc_ablkcipher("cbc(aes)", 0, 0); |
| 1045 | if (IS_ERR(tfm)) { |
| 1046 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 1047 | "crypto_alloc_ablkcipher failed"); |
| 1048 | ret = PTR_ERR(tfm); |
| 1049 | goto err_tfm; |
| 1050 | } |
| 1051 | |
| 1052 | req = ablkcipher_request_alloc(tfm, GFP_KERNEL); |
| 1053 | if (!req) { |
| 1054 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 1055 | "Failed to allocate request for cbc(aes)"); |
| 1056 | ret = -ENOMEM; |
| 1057 | goto err_req; |
| 1058 | } |
| 1059 | |
| 1060 | ablkcipher_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG, |
| 1061 | ecb_aes_complete, &result); |
| 1062 | |
| 1063 | crypto_ablkcipher_clear_flags(tfm, ~0); |
| 1064 | |
| 1065 | ret = crypto_ablkcipher_setkey(tfm, pKey, AES_KEYSIZE_128); |
| 1066 | if (ret) { |
| 1067 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 1068 | "crypto_cipher_setkey failed"); |
| 1069 | goto err_setkey; |
| 1070 | } |
| 1071 | |
| 1072 | memset(iv, 0, IV_SIZE_AES_128); |
| 1073 | |
| 1074 | sg_init_one(&sg_in, pText, AES_BLOCK_SIZE); |
| 1075 | |
| 1076 | sg_init_one(&sg_out, pDecrypted, AES_BLOCK_SIZE); |
| 1077 | |
| 1078 | ablkcipher_request_set_crypt(req, &sg_in, &sg_out, AES_BLOCK_SIZE, iv); |
| 1079 | |
| 1080 | crypto_ablkcipher_decrypt(req); |
| 1081 | |
| 1082 | /* ------------------------------------- */ |
| 1083 | err_setkey: |
| 1084 | cds_ablkcipher_request_free(req); |
| 1085 | err_req: |
| 1086 | cds_crypto_free_ablkcipher(tfm); |
| 1087 | err_tfm: |
| 1088 | /* return ret; */ |
| 1089 | if (ret != 0) { |
| 1090 | CDF_TRACE(CDF_MODULE_ID_CDF, CDF_TRACE_LEVEL_ERROR, |
| 1091 | "%s() call failed", __func__); |
| 1092 | return CDF_STATUS_E_FAULT; |
| 1093 | } |
| 1094 | |
| 1095 | return CDF_STATUS_SUCCESS; |
| 1096 | } |
| 1097 | |
| 1098 | uint32_t cds_chan_to_freq(uint8_t chan) |
| 1099 | { |
| 1100 | if (chan < CDS_24_GHZ_CHANNEL_14) /* ch 0 - ch 13 */ |
| 1101 | return CDS_24_GHZ_BASE_FREQ + chan * CDS_CHAN_SPACING_5MHZ; |
| 1102 | else if (chan == CDS_24_GHZ_CHANNEL_14) /* ch 14 */ |
| 1103 | return CDS_CHAN_14_FREQ; |
| 1104 | else if (chan < CDS_24_GHZ_CHANNEL_27) /* ch 15 - ch 26 */ |
| 1105 | return CDS_CHAN_15_FREQ + |
| 1106 | (chan - CDS_24_GHZ_CHANNEL_15) * CDS_CHAN_SPACING_20MHZ; |
| 1107 | else if (chan == CDS_5_GHZ_CHANNEL_170) |
| 1108 | return CDS_CHAN_170_FREQ; |
| 1109 | else |
| 1110 | return CDS_5_GHZ_BASE_FREQ + chan * CDS_CHAN_SPACING_5MHZ; |
| 1111 | } |
| 1112 | |
| 1113 | uint8_t cds_freq_to_chan(uint32_t freq) |
| 1114 | { |
| 1115 | uint8_t chan; |
| 1116 | |
| 1117 | if (freq > CDS_24_GHZ_BASE_FREQ && freq < CDS_CHAN_14_FREQ) |
| 1118 | chan = ((freq - CDS_24_GHZ_BASE_FREQ) / CDS_CHAN_SPACING_5MHZ); |
| 1119 | else if (freq == CDS_CHAN_14_FREQ) |
| 1120 | chan = CDS_24_GHZ_CHANNEL_14; |
| 1121 | else if ((freq > CDS_24_GHZ_BASE_FREQ) && (freq < CDS_5_GHZ_BASE_FREQ)) |
| 1122 | chan = (((freq - CDS_CHAN_15_FREQ) / CDS_CHAN_SPACING_20MHZ) + |
| 1123 | CDS_24_GHZ_CHANNEL_15); |
| 1124 | else |
| 1125 | chan = (freq - CDS_5_GHZ_BASE_FREQ) / CDS_CHAN_SPACING_5MHZ; |
| 1126 | return chan; |
| 1127 | } |
| 1128 | |
| 1129 | uint8_t cds_chan_to_band(uint32_t chan) |
| 1130 | { |
| 1131 | if (chan <= CDS_24_GHZ_CHANNEL_14) |
| 1132 | return CDS_BAND_2GHZ; |
| 1133 | |
| 1134 | return CDS_BAND_5GHZ; |
| 1135 | } |