1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright 2016 Broadcom 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/string.h> 8 9 #include "util.h" 10 #include "spu.h" 11 #include "spum.h" 12 #include "cipher.h" 13 14 char *hash_alg_name[] = { "None", "md5", "sha1", "sha224", "sha256", "aes", 15 "sha384", "sha512", "sha3_224", "sha3_256", "sha3_384", "sha3_512" }; 16 17 char *aead_alg_name[] = { "ccm(aes)", "gcm(aes)", "authenc" }; 18 19 /* Assumes SPU-M messages are in big endian */ 20 void spum_dump_msg_hdr(u8 *buf, unsigned int buf_len) 21 { 22 u8 *ptr = buf; 23 struct SPUHEADER *spuh = (struct SPUHEADER *)buf; 24 unsigned int hash_key_len = 0; 25 unsigned int hash_state_len = 0; 26 unsigned int cipher_key_len = 0; 27 unsigned int iv_len; 28 u32 pflags; 29 u32 cflags; 30 u32 ecf; 31 u32 cipher_alg; 32 u32 cipher_mode; 33 u32 cipher_type; 34 u32 hash_alg; 35 u32 hash_mode; 36 u32 hash_type; 37 u32 sctx_size; /* SCTX length in words */ 38 u32 sctx_pl_len; /* SCTX payload length in bytes */ 39 40 packet_log("\n"); 41 packet_log("SPU Message header %p len: %u\n", buf, buf_len); 42 43 /* ========== Decode MH ========== */ 44 packet_log(" MH 0x%08x\n", be32_to_cpu(*((u32 *)ptr))); 45 if (spuh->mh.flags & MH_SCTX_PRES) 46 packet_log(" SCTX present\n"); 47 if (spuh->mh.flags & MH_BDESC_PRES) 48 packet_log(" BDESC present\n"); 49 if (spuh->mh.flags & MH_MFM_PRES) 50 packet_log(" MFM present\n"); 51 if (spuh->mh.flags & MH_BD_PRES) 52 packet_log(" BD present\n"); 53 if (spuh->mh.flags & MH_HASH_PRES) 54 packet_log(" HASH present\n"); 55 if (spuh->mh.flags & MH_SUPDT_PRES) 56 packet_log(" SUPDT present\n"); 57 packet_log(" Opcode 0x%02x\n", spuh->mh.op_code); 58 59 ptr += sizeof(spuh->mh) + sizeof(spuh->emh); /* skip emh. unused */ 60 61 /* ========== Decode SCTX ========== */ 62 if (spuh->mh.flags & MH_SCTX_PRES) { 63 pflags = be32_to_cpu(spuh->sa.proto_flags); 64 packet_log(" SCTX[0] 0x%08x\n", pflags); 65 sctx_size = pflags & SCTX_SIZE; 66 packet_log(" Size %u words\n", sctx_size); 67 68 cflags = be32_to_cpu(spuh->sa.cipher_flags); 69 packet_log(" SCTX[1] 0x%08x\n", cflags); 70 packet_log(" Inbound:%lu (1:decrypt/vrfy 0:encrypt/auth)\n", 71 (cflags & CIPHER_INBOUND) >> CIPHER_INBOUND_SHIFT); 72 packet_log(" Order:%lu (1:AuthFirst 0:EncFirst)\n", 73 (cflags & CIPHER_ORDER) >> CIPHER_ORDER_SHIFT); 74 packet_log(" ICV_IS_512:%lx\n", 75 (cflags & ICV_IS_512) >> ICV_IS_512_SHIFT); 76 cipher_alg = (cflags & CIPHER_ALG) >> CIPHER_ALG_SHIFT; 77 cipher_mode = (cflags & CIPHER_MODE) >> CIPHER_MODE_SHIFT; 78 cipher_type = (cflags & CIPHER_TYPE) >> CIPHER_TYPE_SHIFT; 79 packet_log(" Crypto Alg:%u Mode:%u Type:%u\n", 80 cipher_alg, cipher_mode, cipher_type); 81 hash_alg = (cflags & HASH_ALG) >> HASH_ALG_SHIFT; 82 hash_mode = (cflags & HASH_MODE) >> HASH_MODE_SHIFT; 83 hash_type = (cflags & HASH_TYPE) >> HASH_TYPE_SHIFT; 84 packet_log(" Hash Alg:%x Mode:%x Type:%x\n", 85 hash_alg, hash_mode, hash_type); 86 packet_log(" UPDT_Offset:%u\n", cflags & UPDT_OFST); 87 88 ecf = be32_to_cpu(spuh->sa.ecf); 89 packet_log(" SCTX[2] 0x%08x\n", ecf); 90 packet_log(" WriteICV:%lu CheckICV:%lu ICV_SIZE:%u ", 91 (ecf & INSERT_ICV) >> INSERT_ICV_SHIFT, 92 (ecf & CHECK_ICV) >> CHECK_ICV_SHIFT, 93 (ecf & ICV_SIZE) >> ICV_SIZE_SHIFT); 94 packet_log("BD_SUPPRESS:%lu\n", 95 (ecf & BD_SUPPRESS) >> BD_SUPPRESS_SHIFT); 96 packet_log(" SCTX_IV:%lu ExplicitIV:%lu GenIV:%lu ", 97 (ecf & SCTX_IV) >> SCTX_IV_SHIFT, 98 (ecf & EXPLICIT_IV) >> EXPLICIT_IV_SHIFT, 99 (ecf & GEN_IV) >> GEN_IV_SHIFT); 100 packet_log("IV_OV_OFST:%lu EXP_IV_SIZE:%u\n", 101 (ecf & IV_OFFSET) >> IV_OFFSET_SHIFT, 102 ecf & EXP_IV_SIZE); 103 104 ptr += sizeof(struct SCTX); 105 106 if (hash_alg && hash_mode) { 107 char *name = "NONE"; 108 109 switch (hash_alg) { 110 case HASH_ALG_MD5: 111 hash_key_len = 16; 112 name = "MD5"; 113 break; 114 case HASH_ALG_SHA1: 115 hash_key_len = 20; 116 name = "SHA1"; 117 break; 118 case HASH_ALG_SHA224: 119 hash_key_len = 28; 120 name = "SHA224"; 121 break; 122 case HASH_ALG_SHA256: 123 hash_key_len = 32; 124 name = "SHA256"; 125 break; 126 case HASH_ALG_SHA384: 127 hash_key_len = 48; 128 name = "SHA384"; 129 break; 130 case HASH_ALG_SHA512: 131 hash_key_len = 64; 132 name = "SHA512"; 133 break; 134 case HASH_ALG_AES: 135 hash_key_len = 0; 136 name = "AES"; 137 break; 138 case HASH_ALG_NONE: 139 break; 140 } 141 142 packet_log(" Auth Key Type:%s Length:%u Bytes\n", 143 name, hash_key_len); 144 packet_dump(" KEY: ", ptr, hash_key_len); 145 ptr += hash_key_len; 146 } else if ((hash_alg == HASH_ALG_AES) && 147 (hash_mode == HASH_MODE_XCBC)) { 148 char *name = "NONE"; 149 150 switch (cipher_type) { 151 case CIPHER_TYPE_AES128: 152 hash_key_len = 16; 153 name = "AES128-XCBC"; 154 break; 155 case CIPHER_TYPE_AES192: 156 hash_key_len = 24; 157 name = "AES192-XCBC"; 158 break; 159 case CIPHER_TYPE_AES256: 160 hash_key_len = 32; 161 name = "AES256-XCBC"; 162 break; 163 } 164 packet_log(" Auth Key Type:%s Length:%u Bytes\n", 165 name, hash_key_len); 166 packet_dump(" KEY: ", ptr, hash_key_len); 167 ptr += hash_key_len; 168 } 169 170 if (hash_alg && (hash_mode == HASH_MODE_NONE) && 171 (hash_type == HASH_TYPE_UPDT)) { 172 char *name = "NONE"; 173 174 switch (hash_alg) { 175 case HASH_ALG_MD5: 176 hash_state_len = 16; 177 name = "MD5"; 178 break; 179 case HASH_ALG_SHA1: 180 hash_state_len = 20; 181 name = "SHA1"; 182 break; 183 case HASH_ALG_SHA224: 184 hash_state_len = 32; 185 name = "SHA224"; 186 break; 187 case HASH_ALG_SHA256: 188 hash_state_len = 32; 189 name = "SHA256"; 190 break; 191 case HASH_ALG_SHA384: 192 hash_state_len = 48; 193 name = "SHA384"; 194 break; 195 case HASH_ALG_SHA512: 196 hash_state_len = 64; 197 name = "SHA512"; 198 break; 199 case HASH_ALG_AES: 200 hash_state_len = 0; 201 name = "AES"; 202 break; 203 case HASH_ALG_NONE: 204 break; 205 } 206 207 packet_log(" Auth State Type:%s Length:%u Bytes\n", 208 name, hash_state_len); 209 packet_dump(" State: ", ptr, hash_state_len); 210 ptr += hash_state_len; 211 } 212 213 if (cipher_alg) { 214 char *name = "NONE"; 215 216 switch (cipher_alg) { 217 case CIPHER_ALG_DES: 218 cipher_key_len = 8; 219 name = "DES"; 220 break; 221 case CIPHER_ALG_3DES: 222 cipher_key_len = 24; 223 name = "3DES"; 224 break; 225 case CIPHER_ALG_AES: 226 switch (cipher_type) { 227 case CIPHER_TYPE_AES128: 228 cipher_key_len = 16; 229 name = "AES128"; 230 break; 231 case CIPHER_TYPE_AES192: 232 cipher_key_len = 24; 233 name = "AES192"; 234 break; 235 case CIPHER_TYPE_AES256: 236 cipher_key_len = 32; 237 name = "AES256"; 238 break; 239 } 240 break; 241 case CIPHER_ALG_NONE: 242 break; 243 } 244 245 packet_log(" Cipher Key Type:%s Length:%u Bytes\n", 246 name, cipher_key_len); 247 248 /* XTS has two keys */ 249 if (cipher_mode == CIPHER_MODE_XTS) { 250 packet_dump(" KEY2: ", ptr, cipher_key_len); 251 ptr += cipher_key_len; 252 packet_dump(" KEY1: ", ptr, cipher_key_len); 253 ptr += cipher_key_len; 254 255 cipher_key_len *= 2; 256 } else { 257 packet_dump(" KEY: ", ptr, cipher_key_len); 258 ptr += cipher_key_len; 259 } 260 261 if (ecf & SCTX_IV) { 262 sctx_pl_len = sctx_size * sizeof(u32) - 263 sizeof(struct SCTX); 264 iv_len = sctx_pl_len - 265 (hash_key_len + hash_state_len + 266 cipher_key_len); 267 packet_log(" IV Length:%u Bytes\n", iv_len); 268 packet_dump(" IV: ", ptr, iv_len); 269 ptr += iv_len; 270 } 271 } 272 } 273 274 /* ========== Decode BDESC ========== */ 275 if (spuh->mh.flags & MH_BDESC_PRES) { 276 #ifdef DEBUG 277 struct BDESC_HEADER *bdesc = (struct BDESC_HEADER *)ptr; 278 #endif 279 packet_log(" BDESC[0] 0x%08x\n", be32_to_cpu(*((u32 *)ptr))); 280 packet_log(" OffsetMAC:%u LengthMAC:%u\n", 281 be16_to_cpu(bdesc->offset_mac), 282 be16_to_cpu(bdesc->length_mac)); 283 ptr += sizeof(u32); 284 285 packet_log(" BDESC[1] 0x%08x\n", be32_to_cpu(*((u32 *)ptr))); 286 packet_log(" OffsetCrypto:%u LengthCrypto:%u\n", 287 be16_to_cpu(bdesc->offset_crypto), 288 be16_to_cpu(bdesc->length_crypto)); 289 ptr += sizeof(u32); 290 291 packet_log(" BDESC[2] 0x%08x\n", be32_to_cpu(*((u32 *)ptr))); 292 packet_log(" OffsetICV:%u OffsetIV:%u\n", 293 be16_to_cpu(bdesc->offset_icv), 294 be16_to_cpu(bdesc->offset_iv)); 295 ptr += sizeof(u32); 296 } 297 298 /* ========== Decode BD ========== */ 299 if (spuh->mh.flags & MH_BD_PRES) { 300 #ifdef DEBUG 301 struct BD_HEADER *bd = (struct BD_HEADER *)ptr; 302 #endif 303 packet_log(" BD[0] 0x%08x\n", be32_to_cpu(*((u32 *)ptr))); 304 packet_log(" Size:%ubytes PrevLength:%u\n", 305 be16_to_cpu(bd->size), be16_to_cpu(bd->prev_length)); 306 ptr += 4; 307 } 308 309 /* Double check sanity */ 310 if (buf + buf_len != ptr) { 311 packet_log(" Packet parsed incorrectly. "); 312 packet_log("buf:%p buf_len:%u buf+buf_len:%p ptr:%p\n", 313 buf, buf_len, buf + buf_len, ptr); 314 } 315 316 packet_log("\n"); 317 } 318 319 /** 320 * spum_ns2_ctx_max_payload() - Determine the max length of the payload for a 321 * SPU message for a given cipher and hash alg context. 322 * @cipher_alg: The cipher algorithm 323 * @cipher_mode: The cipher mode 324 * @blocksize: The size of a block of data for this algo 325 * 326 * The max payload must be a multiple of the blocksize so that if a request is 327 * too large to fit in a single SPU message, the request can be broken into 328 * max_payload sized chunks. Each chunk must be a multiple of blocksize. 329 * 330 * Return: Max payload length in bytes 331 */ 332 u32 spum_ns2_ctx_max_payload(enum spu_cipher_alg cipher_alg, 333 enum spu_cipher_mode cipher_mode, 334 unsigned int blocksize) 335 { 336 u32 max_payload = SPUM_NS2_MAX_PAYLOAD; 337 u32 excess; 338 339 /* In XTS on SPU-M, we'll need to insert tweak before input data */ 340 if (cipher_mode == CIPHER_MODE_XTS) 341 max_payload -= SPU_XTS_TWEAK_SIZE; 342 343 excess = max_payload % blocksize; 344 345 return max_payload - excess; 346 } 347 348 /** 349 * spum_nsp_ctx_max_payload() - Determine the max length of the payload for a 350 * SPU message for a given cipher and hash alg context. 351 * @cipher_alg: The cipher algorithm 352 * @cipher_mode: The cipher mode 353 * @blocksize: The size of a block of data for this algo 354 * 355 * The max payload must be a multiple of the blocksize so that if a request is 356 * too large to fit in a single SPU message, the request can be broken into 357 * max_payload sized chunks. Each chunk must be a multiple of blocksize. 358 * 359 * Return: Max payload length in bytes 360 */ 361 u32 spum_nsp_ctx_max_payload(enum spu_cipher_alg cipher_alg, 362 enum spu_cipher_mode cipher_mode, 363 unsigned int blocksize) 364 { 365 u32 max_payload = SPUM_NSP_MAX_PAYLOAD; 366 u32 excess; 367 368 /* In XTS on SPU-M, we'll need to insert tweak before input data */ 369 if (cipher_mode == CIPHER_MODE_XTS) 370 max_payload -= SPU_XTS_TWEAK_SIZE; 371 372 excess = max_payload % blocksize; 373 374 return max_payload - excess; 375 } 376 377 /** spum_payload_length() - Given a SPU-M message header, extract the payload 378 * length. 379 * @spu_hdr: Start of SPU header 380 * 381 * Assumes just MH, EMH, BD (no SCTX, BDESC. Works for response frames. 382 * 383 * Return: payload length in bytes 384 */ 385 u32 spum_payload_length(u8 *spu_hdr) 386 { 387 struct BD_HEADER *bd; 388 u32 pl_len; 389 390 /* Find BD header. skip MH, EMH */ 391 bd = (struct BD_HEADER *)(spu_hdr + 8); 392 pl_len = be16_to_cpu(bd->size); 393 394 return pl_len; 395 } 396 397 /** 398 * spum_response_hdr_len() - Given the length of the hash key and encryption 399 * key, determine the expected length of a SPU response header. 400 * @auth_key_len: authentication key length (bytes) 401 * @enc_key_len: encryption key length (bytes) 402 * @is_hash: true if response message is for a hash operation 403 * 404 * Return: length of SPU response header (bytes) 405 */ 406 u16 spum_response_hdr_len(u16 auth_key_len, u16 enc_key_len, bool is_hash) 407 { 408 if (is_hash) 409 return SPU_HASH_RESP_HDR_LEN; 410 else 411 return SPU_RESP_HDR_LEN; 412 } 413 414 /** 415 * spum_hash_pad_len() - Calculate the length of hash padding required to extend 416 * data to a full block size. 417 * @hash_alg: hash algorithm 418 * @hash_mode: hash mode 419 * @chunksize: length of data, in bytes 420 * @hash_block_size: size of a block of data for hash algorithm 421 * 422 * Reserve space for 1 byte (0x80) start of pad and the total length as u64 423 * 424 * Return: length of hash pad in bytes 425 */ 426 u16 spum_hash_pad_len(enum hash_alg hash_alg, enum hash_mode hash_mode, 427 u32 chunksize, u16 hash_block_size) 428 { 429 unsigned int length_len; 430 unsigned int used_space_last_block; 431 int hash_pad_len; 432 433 /* AES-XCBC hash requires just padding to next block boundary */ 434 if ((hash_alg == HASH_ALG_AES) && (hash_mode == HASH_MODE_XCBC)) { 435 used_space_last_block = chunksize % hash_block_size; 436 hash_pad_len = hash_block_size - used_space_last_block; 437 if (hash_pad_len >= hash_block_size) 438 hash_pad_len -= hash_block_size; 439 return hash_pad_len; 440 } 441 442 used_space_last_block = chunksize % hash_block_size + 1; 443 if ((hash_alg == HASH_ALG_SHA384) || (hash_alg == HASH_ALG_SHA512)) 444 length_len = 2 * sizeof(u64); 445 else 446 length_len = sizeof(u64); 447 448 used_space_last_block += length_len; 449 hash_pad_len = hash_block_size - used_space_last_block; 450 if (hash_pad_len < 0) 451 hash_pad_len += hash_block_size; 452 453 hash_pad_len += 1 + length_len; 454 return hash_pad_len; 455 } 456 457 /** 458 * spum_gcm_ccm_pad_len() - Determine the required length of GCM or CCM padding. 459 * @cipher_mode: Algo type 460 * @data_size: Length of plaintext (bytes) 461 * 462 * @Return: Length of padding, in bytes 463 */ 464 u32 spum_gcm_ccm_pad_len(enum spu_cipher_mode cipher_mode, 465 unsigned int data_size) 466 { 467 u32 pad_len = 0; 468 u32 m1 = SPU_GCM_CCM_ALIGN - 1; 469 470 if ((cipher_mode == CIPHER_MODE_GCM) || 471 (cipher_mode == CIPHER_MODE_CCM)) 472 pad_len = ((data_size + m1) & ~m1) - data_size; 473 474 return pad_len; 475 } 476 477 /** 478 * spum_assoc_resp_len() - Determine the size of the receive buffer required to 479 * catch associated data. 480 * @cipher_mode: cipher mode 481 * @assoc_len: length of associated data (bytes) 482 * @iv_len: length of IV (bytes) 483 * @is_encrypt: true if encrypting. false if decrypting. 484 * 485 * Return: length of associated data in response message (bytes) 486 */ 487 u32 spum_assoc_resp_len(enum spu_cipher_mode cipher_mode, 488 unsigned int assoc_len, unsigned int iv_len, 489 bool is_encrypt) 490 { 491 u32 buflen = 0; 492 u32 pad; 493 494 if (assoc_len) 495 buflen = assoc_len; 496 497 if (cipher_mode == CIPHER_MODE_GCM) { 498 /* AAD needs to be padded in responses too */ 499 pad = spum_gcm_ccm_pad_len(cipher_mode, buflen); 500 buflen += pad; 501 } 502 if (cipher_mode == CIPHER_MODE_CCM) { 503 /* 504 * AAD needs to be padded in responses too 505 * for CCM, len + 2 needs to be 128-bit aligned. 506 */ 507 pad = spum_gcm_ccm_pad_len(cipher_mode, buflen + 2); 508 buflen += pad; 509 } 510 511 return buflen; 512 } 513 514 /** 515 * spu_aead_ivlen() - Calculate the length of the AEAD IV to be included 516 * in a SPU request after the AAD and before the payload. 517 * @cipher_mode: cipher mode 518 * @iv_ctr_len: initialization vector length in bytes 519 * 520 * In Linux ~4.2 and later, the assoc_data sg includes the IV. So no need 521 * to include the IV as a separate field in the SPU request msg. 522 * 523 * Return: Length of AEAD IV in bytes 524 */ 525 u8 spum_aead_ivlen(enum spu_cipher_mode cipher_mode, u16 iv_len) 526 { 527 return 0; 528 } 529 530 /** 531 * spum_hash_type() - Determine the type of hash operation. 532 * @src_sent: The number of bytes in the current request that have already 533 * been sent to the SPU to be hashed. 534 * 535 * We do not use HASH_TYPE_FULL for requests that fit in a single SPU message. 536 * Using FULL causes failures (such as when the string to be hashed is empty). 537 * For similar reasons, we never use HASH_TYPE_FIN. Instead, submit messages 538 * as INIT or UPDT and do the hash padding in sw. 539 */ 540 enum hash_type spum_hash_type(u32 src_sent) 541 { 542 return src_sent ? HASH_TYPE_UPDT : HASH_TYPE_INIT; 543 } 544 545 /** 546 * spum_digest_size() - Determine the size of a hash digest to expect the SPU to 547 * return. 548 * alg_digest_size: Number of bytes in the final digest for the given algo 549 * alg: The hash algorithm 550 * htype: Type of hash operation (init, update, full, etc) 551 * 552 * When doing incremental hashing for an algorithm with a truncated hash 553 * (e.g., SHA224), the SPU returns the full digest so that it can be fed back as 554 * a partial result for the next chunk. 555 */ 556 u32 spum_digest_size(u32 alg_digest_size, enum hash_alg alg, 557 enum hash_type htype) 558 { 559 u32 digestsize = alg_digest_size; 560 561 /* SPU returns complete digest when doing incremental hash and truncated 562 * hash algo. 563 */ 564 if ((htype == HASH_TYPE_INIT) || (htype == HASH_TYPE_UPDT)) { 565 if (alg == HASH_ALG_SHA224) 566 digestsize = SHA256_DIGEST_SIZE; 567 else if (alg == HASH_ALG_SHA384) 568 digestsize = SHA512_DIGEST_SIZE; 569 } 570 return digestsize; 571 } 572 573 /** 574 * spum_create_request() - Build a SPU request message header, up to and 575 * including the BD header. Construct the message starting at spu_hdr. Caller 576 * should allocate this buffer in DMA-able memory at least SPU_HEADER_ALLOC_LEN 577 * bytes long. 578 * @spu_hdr: Start of buffer where SPU request header is to be written 579 * @req_opts: SPU request message options 580 * @cipher_parms: Parameters related to cipher algorithm 581 * @hash_parms: Parameters related to hash algorithm 582 * @aead_parms: Parameters related to AEAD operation 583 * @data_size: Length of data to be encrypted or authenticated. If AEAD, does 584 * not include length of AAD. 585 586 * Return: the length of the SPU header in bytes. 0 if an error occurs. 587 */ 588 u32 spum_create_request(u8 *spu_hdr, 589 struct spu_request_opts *req_opts, 590 struct spu_cipher_parms *cipher_parms, 591 struct spu_hash_parms *hash_parms, 592 struct spu_aead_parms *aead_parms, 593 unsigned int data_size) 594 { 595 struct SPUHEADER *spuh; 596 struct BDESC_HEADER *bdesc; 597 struct BD_HEADER *bd; 598 599 u8 *ptr; 600 u32 protocol_bits = 0; 601 u32 cipher_bits = 0; 602 u32 ecf_bits = 0; 603 u8 sctx_words = 0; 604 unsigned int buf_len = 0; 605 606 /* size of the cipher payload */ 607 unsigned int cipher_len = hash_parms->prebuf_len + data_size + 608 hash_parms->pad_len; 609 610 /* offset of prebuf or data from end of BD header */ 611 unsigned int cipher_offset = aead_parms->assoc_size + 612 aead_parms->iv_len + aead_parms->aad_pad_len; 613 614 /* total size of the DB data (without STAT word padding) */ 615 unsigned int real_db_size = spu_real_db_size(aead_parms->assoc_size, 616 aead_parms->iv_len, 617 hash_parms->prebuf_len, 618 data_size, 619 aead_parms->aad_pad_len, 620 aead_parms->data_pad_len, 621 hash_parms->pad_len); 622 623 unsigned int auth_offset = 0; 624 unsigned int offset_iv = 0; 625 626 /* size/offset of the auth payload */ 627 unsigned int auth_len; 628 629 auth_len = real_db_size; 630 631 if (req_opts->is_aead && req_opts->is_inbound) 632 cipher_len -= hash_parms->digestsize; 633 634 if (req_opts->is_aead && req_opts->is_inbound) 635 auth_len -= hash_parms->digestsize; 636 637 if ((hash_parms->alg == HASH_ALG_AES) && 638 (hash_parms->mode == HASH_MODE_XCBC)) { 639 auth_len -= hash_parms->pad_len; 640 cipher_len -= hash_parms->pad_len; 641 } 642 643 flow_log("%s()\n", __func__); 644 flow_log(" in:%u authFirst:%u\n", 645 req_opts->is_inbound, req_opts->auth_first); 646 flow_log(" %s. cipher alg:%u mode:%u type %u\n", 647 spu_alg_name(cipher_parms->alg, cipher_parms->mode), 648 cipher_parms->alg, cipher_parms->mode, cipher_parms->type); 649 flow_log(" key: %d\n", cipher_parms->key_len); 650 flow_dump(" key: ", cipher_parms->key_buf, cipher_parms->key_len); 651 flow_log(" iv: %d\n", cipher_parms->iv_len); 652 flow_dump(" iv: ", cipher_parms->iv_buf, cipher_parms->iv_len); 653 flow_log(" auth alg:%u mode:%u type %u\n", 654 hash_parms->alg, hash_parms->mode, hash_parms->type); 655 flow_log(" digestsize: %u\n", hash_parms->digestsize); 656 flow_log(" authkey: %d\n", hash_parms->key_len); 657 flow_dump(" authkey: ", hash_parms->key_buf, hash_parms->key_len); 658 flow_log(" assoc_size:%u\n", aead_parms->assoc_size); 659 flow_log(" prebuf_len:%u\n", hash_parms->prebuf_len); 660 flow_log(" data_size:%u\n", data_size); 661 flow_log(" hash_pad_len:%u\n", hash_parms->pad_len); 662 flow_log(" real_db_size:%u\n", real_db_size); 663 flow_log(" auth_offset:%u auth_len:%u cipher_offset:%u cipher_len:%u\n", 664 auth_offset, auth_len, cipher_offset, cipher_len); 665 flow_log(" aead_iv: %u\n", aead_parms->iv_len); 666 667 /* starting out: zero the header (plus some) */ 668 ptr = spu_hdr; 669 memset(ptr, 0, sizeof(struct SPUHEADER)); 670 671 /* format master header word */ 672 /* Do not set the next bit even though the datasheet says to */ 673 spuh = (struct SPUHEADER *)ptr; 674 ptr += sizeof(struct SPUHEADER); 675 buf_len += sizeof(struct SPUHEADER); 676 677 spuh->mh.op_code = SPU_CRYPTO_OPERATION_GENERIC; 678 spuh->mh.flags |= (MH_SCTX_PRES | MH_BDESC_PRES | MH_BD_PRES); 679 680 /* Format sctx word 0 (protocol_bits) */ 681 sctx_words = 3; /* size in words */ 682 683 /* Format sctx word 1 (cipher_bits) */ 684 if (req_opts->is_inbound) 685 cipher_bits |= CIPHER_INBOUND; 686 if (req_opts->auth_first) 687 cipher_bits |= CIPHER_ORDER; 688 689 /* Set the crypto parameters in the cipher.flags */ 690 cipher_bits |= cipher_parms->alg << CIPHER_ALG_SHIFT; 691 cipher_bits |= cipher_parms->mode << CIPHER_MODE_SHIFT; 692 cipher_bits |= cipher_parms->type << CIPHER_TYPE_SHIFT; 693 694 /* Set the auth parameters in the cipher.flags */ 695 cipher_bits |= hash_parms->alg << HASH_ALG_SHIFT; 696 cipher_bits |= hash_parms->mode << HASH_MODE_SHIFT; 697 cipher_bits |= hash_parms->type << HASH_TYPE_SHIFT; 698 699 /* 700 * Format sctx extensions if required, and update main fields if 701 * required) 702 */ 703 if (hash_parms->alg) { 704 /* Write the authentication key material if present */ 705 if (hash_parms->key_len) { 706 memcpy(ptr, hash_parms->key_buf, hash_parms->key_len); 707 ptr += hash_parms->key_len; 708 buf_len += hash_parms->key_len; 709 sctx_words += hash_parms->key_len / 4; 710 } 711 712 if ((cipher_parms->mode == CIPHER_MODE_GCM) || 713 (cipher_parms->mode == CIPHER_MODE_CCM)) 714 /* unpadded length */ 715 offset_iv = aead_parms->assoc_size; 716 717 /* if GCM/CCM we need to write ICV into the payload */ 718 if (!req_opts->is_inbound) { 719 if ((cipher_parms->mode == CIPHER_MODE_GCM) || 720 (cipher_parms->mode == CIPHER_MODE_CCM)) 721 ecf_bits |= 1 << INSERT_ICV_SHIFT; 722 } else { 723 ecf_bits |= CHECK_ICV; 724 } 725 726 /* Inform the SPU of the ICV size (in words) */ 727 if (hash_parms->digestsize == 64) 728 cipher_bits |= ICV_IS_512; 729 else 730 ecf_bits |= 731 (hash_parms->digestsize / 4) << ICV_SIZE_SHIFT; 732 } 733 734 if (req_opts->bd_suppress) 735 ecf_bits |= BD_SUPPRESS; 736 737 /* copy the encryption keys in the SAD entry */ 738 if (cipher_parms->alg) { 739 if (cipher_parms->key_len) { 740 memcpy(ptr, cipher_parms->key_buf, 741 cipher_parms->key_len); 742 ptr += cipher_parms->key_len; 743 buf_len += cipher_parms->key_len; 744 sctx_words += cipher_parms->key_len / 4; 745 } 746 747 /* 748 * if encrypting then set IV size, use SCTX IV unless no IV 749 * given here 750 */ 751 if (cipher_parms->iv_buf && cipher_parms->iv_len) { 752 /* Use SCTX IV */ 753 ecf_bits |= SCTX_IV; 754 755 /* cipher iv provided so put it in here */ 756 memcpy(ptr, cipher_parms->iv_buf, cipher_parms->iv_len); 757 758 ptr += cipher_parms->iv_len; 759 buf_len += cipher_parms->iv_len; 760 sctx_words += cipher_parms->iv_len / 4; 761 } 762 } 763 764 /* 765 * RFC4543 (GMAC/ESP) requires data to be sent as part of AAD 766 * so we need to override the BDESC parameters. 767 */ 768 if (req_opts->is_rfc4543) { 769 if (req_opts->is_inbound) 770 data_size -= hash_parms->digestsize; 771 offset_iv = aead_parms->assoc_size + data_size; 772 cipher_len = 0; 773 cipher_offset = offset_iv; 774 auth_len = cipher_offset + aead_parms->data_pad_len; 775 } 776 777 /* write in the total sctx length now that we know it */ 778 protocol_bits |= sctx_words; 779 780 /* Endian adjust the SCTX */ 781 spuh->sa.proto_flags = cpu_to_be32(protocol_bits); 782 spuh->sa.cipher_flags = cpu_to_be32(cipher_bits); 783 spuh->sa.ecf = cpu_to_be32(ecf_bits); 784 785 /* === create the BDESC section === */ 786 bdesc = (struct BDESC_HEADER *)ptr; 787 788 bdesc->offset_mac = cpu_to_be16(auth_offset); 789 bdesc->length_mac = cpu_to_be16(auth_len); 790 bdesc->offset_crypto = cpu_to_be16(cipher_offset); 791 bdesc->length_crypto = cpu_to_be16(cipher_len); 792 793 /* 794 * CCM in SPU-M requires that ICV not be in same 32-bit word as data or 795 * padding. So account for padding as necessary. 796 */ 797 if (cipher_parms->mode == CIPHER_MODE_CCM) 798 auth_len += spum_wordalign_padlen(auth_len); 799 800 bdesc->offset_icv = cpu_to_be16(auth_len); 801 bdesc->offset_iv = cpu_to_be16(offset_iv); 802 803 ptr += sizeof(struct BDESC_HEADER); 804 buf_len += sizeof(struct BDESC_HEADER); 805 806 /* === no MFM section === */ 807 808 /* === create the BD section === */ 809 810 /* add the BD header */ 811 bd = (struct BD_HEADER *)ptr; 812 bd->size = cpu_to_be16(real_db_size); 813 bd->prev_length = 0; 814 815 ptr += sizeof(struct BD_HEADER); 816 buf_len += sizeof(struct BD_HEADER); 817 818 packet_dump(" SPU request header: ", spu_hdr, buf_len); 819 820 return buf_len; 821 } 822 823 /** 824 * spum_cipher_req_init() - Build a SPU request message header, up to and 825 * including the BD header. 826 * @spu_hdr: Start of SPU request header (MH) 827 * @cipher_parms: Parameters that describe the cipher request 828 * 829 * Construct the message starting at spu_hdr. Caller should allocate this buffer 830 * in DMA-able memory at least SPU_HEADER_ALLOC_LEN bytes long. 831 * 832 * Return: the length of the SPU header in bytes. 0 if an error occurs. 833 */ 834 u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms) 835 { 836 struct SPUHEADER *spuh; 837 u32 protocol_bits = 0; 838 u32 cipher_bits = 0; 839 u32 ecf_bits = 0; 840 u8 sctx_words = 0; 841 u8 *ptr = spu_hdr; 842 843 flow_log("%s()\n", __func__); 844 flow_log(" cipher alg:%u mode:%u type %u\n", cipher_parms->alg, 845 cipher_parms->mode, cipher_parms->type); 846 flow_log(" cipher_iv_len: %u\n", cipher_parms->iv_len); 847 flow_log(" key: %d\n", cipher_parms->key_len); 848 flow_dump(" key: ", cipher_parms->key_buf, cipher_parms->key_len); 849 850 /* starting out: zero the header (plus some) */ 851 memset(spu_hdr, 0, sizeof(struct SPUHEADER)); 852 ptr += sizeof(struct SPUHEADER); 853 854 /* format master header word */ 855 /* Do not set the next bit even though the datasheet says to */ 856 spuh = (struct SPUHEADER *)spu_hdr; 857 858 spuh->mh.op_code = SPU_CRYPTO_OPERATION_GENERIC; 859 spuh->mh.flags |= (MH_SCTX_PRES | MH_BDESC_PRES | MH_BD_PRES); 860 861 /* Format sctx word 0 (protocol_bits) */ 862 sctx_words = 3; /* size in words */ 863 864 /* copy the encryption keys in the SAD entry */ 865 if (cipher_parms->alg) { 866 if (cipher_parms->key_len) { 867 ptr += cipher_parms->key_len; 868 sctx_words += cipher_parms->key_len / 4; 869 } 870 871 /* 872 * if encrypting then set IV size, use SCTX IV unless no IV 873 * given here 874 */ 875 if (cipher_parms->iv_len) { 876 /* Use SCTX IV */ 877 ecf_bits |= SCTX_IV; 878 ptr += cipher_parms->iv_len; 879 sctx_words += cipher_parms->iv_len / 4; 880 } 881 } 882 883 /* Set the crypto parameters in the cipher.flags */ 884 cipher_bits |= cipher_parms->alg << CIPHER_ALG_SHIFT; 885 cipher_bits |= cipher_parms->mode << CIPHER_MODE_SHIFT; 886 cipher_bits |= cipher_parms->type << CIPHER_TYPE_SHIFT; 887 888 /* copy the encryption keys in the SAD entry */ 889 if (cipher_parms->alg && cipher_parms->key_len) 890 memcpy(spuh + 1, cipher_parms->key_buf, cipher_parms->key_len); 891 892 /* write in the total sctx length now that we know it */ 893 protocol_bits |= sctx_words; 894 895 /* Endian adjust the SCTX */ 896 spuh->sa.proto_flags = cpu_to_be32(protocol_bits); 897 898 /* Endian adjust the SCTX */ 899 spuh->sa.cipher_flags = cpu_to_be32(cipher_bits); 900 spuh->sa.ecf = cpu_to_be32(ecf_bits); 901 902 packet_dump(" SPU request header: ", spu_hdr, 903 sizeof(struct SPUHEADER)); 904 905 return sizeof(struct SPUHEADER) + cipher_parms->key_len + 906 cipher_parms->iv_len + sizeof(struct BDESC_HEADER) + 907 sizeof(struct BD_HEADER); 908 } 909 910 /** 911 * spum_cipher_req_finish() - Finish building a SPU request message header for a 912 * block cipher request. Assumes much of the header was already filled in at 913 * setkey() time in spu_cipher_req_init(). 914 * @spu_hdr: Start of the request message header (MH field) 915 * @spu_req_hdr_len: Length in bytes of the SPU request header 916 * @isInbound: 0 encrypt, 1 decrypt 917 * @cipher_parms: Parameters describing cipher operation to be performed 918 * @data_size: Length of the data in the BD field 919 * 920 * Assumes much of the header was already filled in at setkey() time in 921 * spum_cipher_req_init(). 922 * spum_cipher_req_init() fills in the encryption key. 923 */ 924 void spum_cipher_req_finish(u8 *spu_hdr, 925 u16 spu_req_hdr_len, 926 unsigned int is_inbound, 927 struct spu_cipher_parms *cipher_parms, 928 unsigned int data_size) 929 { 930 struct SPUHEADER *spuh; 931 struct BDESC_HEADER *bdesc; 932 struct BD_HEADER *bd; 933 u8 *bdesc_ptr = spu_hdr + spu_req_hdr_len - 934 (sizeof(struct BD_HEADER) + sizeof(struct BDESC_HEADER)); 935 936 u32 cipher_bits; 937 938 flow_log("%s()\n", __func__); 939 flow_log(" in: %u\n", is_inbound); 940 flow_log(" cipher alg: %u, cipher_type: %u\n", cipher_parms->alg, 941 cipher_parms->type); 942 943 /* 944 * In XTS mode, API puts "i" parameter (block tweak) in IV. For 945 * SPU-M, should be in start of the BD; tx_sg_create() copies it there. 946 * IV in SPU msg for SPU-M should be 0, since that's the "j" parameter 947 * (block ctr within larger data unit) - given we can send entire disk 948 * block (<= 4KB) in 1 SPU msg, don't need to use this parameter. 949 */ 950 if (cipher_parms->mode == CIPHER_MODE_XTS) 951 memset(cipher_parms->iv_buf, 0, cipher_parms->iv_len); 952 953 flow_log(" iv len: %d\n", cipher_parms->iv_len); 954 flow_dump(" iv: ", cipher_parms->iv_buf, cipher_parms->iv_len); 955 flow_log(" data_size: %u\n", data_size); 956 957 /* format master header word */ 958 /* Do not set the next bit even though the datasheet says to */ 959 spuh = (struct SPUHEADER *)spu_hdr; 960 961 /* cipher_bits was initialized at setkey time */ 962 cipher_bits = be32_to_cpu(spuh->sa.cipher_flags); 963 964 /* Format sctx word 1 (cipher_bits) */ 965 if (is_inbound) 966 cipher_bits |= CIPHER_INBOUND; 967 else 968 cipher_bits &= ~CIPHER_INBOUND; 969 970 if (cipher_parms->alg && cipher_parms->iv_buf && cipher_parms->iv_len) 971 /* cipher iv provided so put it in here */ 972 memcpy(bdesc_ptr - cipher_parms->iv_len, cipher_parms->iv_buf, 973 cipher_parms->iv_len); 974 975 spuh->sa.cipher_flags = cpu_to_be32(cipher_bits); 976 977 /* === create the BDESC section === */ 978 bdesc = (struct BDESC_HEADER *)bdesc_ptr; 979 bdesc->offset_mac = 0; 980 bdesc->length_mac = 0; 981 bdesc->offset_crypto = 0; 982 983 /* XTS mode, data_size needs to include tweak parameter */ 984 if (cipher_parms->mode == CIPHER_MODE_XTS) 985 bdesc->length_crypto = cpu_to_be16(data_size + 986 SPU_XTS_TWEAK_SIZE); 987 else 988 bdesc->length_crypto = cpu_to_be16(data_size); 989 990 bdesc->offset_icv = 0; 991 bdesc->offset_iv = 0; 992 993 /* === no MFM section === */ 994 995 /* === create the BD section === */ 996 /* add the BD header */ 997 bd = (struct BD_HEADER *)(bdesc_ptr + sizeof(struct BDESC_HEADER)); 998 bd->size = cpu_to_be16(data_size); 999 1000 /* XTS mode, data_size needs to include tweak parameter */ 1001 if (cipher_parms->mode == CIPHER_MODE_XTS) 1002 bd->size = cpu_to_be16(data_size + SPU_XTS_TWEAK_SIZE); 1003 else 1004 bd->size = cpu_to_be16(data_size); 1005 1006 bd->prev_length = 0; 1007 1008 packet_dump(" SPU request header: ", spu_hdr, spu_req_hdr_len); 1009 } 1010 1011 /** 1012 * spum_request_pad() - Create pad bytes at the end of the data. 1013 * @pad_start: Start of buffer where pad bytes are to be written 1014 * @gcm_ccm_padding: length of GCM/CCM padding, in bytes 1015 * @hash_pad_len: Number of bytes of padding extend data to full block 1016 * @auth_alg: authentication algorithm 1017 * @auth_mode: authentication mode 1018 * @total_sent: length inserted at end of hash pad 1019 * @status_padding: Number of bytes of padding to align STATUS word 1020 * 1021 * There may be three forms of pad: 1022 * 1. GCM/CCM pad - for GCM/CCM mode ciphers, pad to 16-byte alignment 1023 * 2. hash pad - pad to a block length, with 0x80 data terminator and 1024 * size at the end 1025 * 3. STAT pad - to ensure the STAT field is 4-byte aligned 1026 */ 1027 void spum_request_pad(u8 *pad_start, 1028 u32 gcm_ccm_padding, 1029 u32 hash_pad_len, 1030 enum hash_alg auth_alg, 1031 enum hash_mode auth_mode, 1032 unsigned int total_sent, u32 status_padding) 1033 { 1034 u8 *ptr = pad_start; 1035 1036 /* fix data alignent for GCM/CCM */ 1037 if (gcm_ccm_padding > 0) { 1038 flow_log(" GCM: padding to 16 byte alignment: %u bytes\n", 1039 gcm_ccm_padding); 1040 memset(ptr, 0, gcm_ccm_padding); 1041 ptr += gcm_ccm_padding; 1042 } 1043 1044 if (hash_pad_len > 0) { 1045 /* clear the padding section */ 1046 memset(ptr, 0, hash_pad_len); 1047 1048 if ((auth_alg == HASH_ALG_AES) && 1049 (auth_mode == HASH_MODE_XCBC)) { 1050 /* AES/XCBC just requires padding to be 0s */ 1051 ptr += hash_pad_len; 1052 } else { 1053 /* terminate the data */ 1054 *ptr = 0x80; 1055 ptr += (hash_pad_len - sizeof(u64)); 1056 1057 /* add the size at the end as required per alg */ 1058 if (auth_alg == HASH_ALG_MD5) 1059 *(u64 *)ptr = cpu_to_le64((u64)total_sent * 8); 1060 else /* SHA1, SHA2-224, SHA2-256 */ 1061 *(u64 *)ptr = cpu_to_be64((u64)total_sent * 8); 1062 ptr += sizeof(u64); 1063 } 1064 } 1065 1066 /* pad to a 4byte alignment for STAT */ 1067 if (status_padding > 0) { 1068 flow_log(" STAT: padding to 4 byte alignment: %u bytes\n", 1069 status_padding); 1070 1071 memset(ptr, 0, status_padding); 1072 ptr += status_padding; 1073 } 1074 } 1075 1076 /** 1077 * spum_xts_tweak_in_payload() - Indicate that SPUM DOES place the XTS tweak 1078 * field in the packet payload (rather than using IV) 1079 * 1080 * Return: 1 1081 */ 1082 u8 spum_xts_tweak_in_payload(void) 1083 { 1084 return 1; 1085 } 1086 1087 /** 1088 * spum_tx_status_len() - Return the length of the STATUS field in a SPU 1089 * response message. 1090 * 1091 * Return: Length of STATUS field in bytes. 1092 */ 1093 u8 spum_tx_status_len(void) 1094 { 1095 return SPU_TX_STATUS_LEN; 1096 } 1097 1098 /** 1099 * spum_rx_status_len() - Return the length of the STATUS field in a SPU 1100 * response message. 1101 * 1102 * Return: Length of STATUS field in bytes. 1103 */ 1104 u8 spum_rx_status_len(void) 1105 { 1106 return SPU_RX_STATUS_LEN; 1107 } 1108 1109 /** 1110 * spum_status_process() - Process the status from a SPU response message. 1111 * @statp: start of STATUS word 1112 * Return: 1113 * 0 - if status is good and response should be processed 1114 * !0 - status indicates an error and response is invalid 1115 */ 1116 int spum_status_process(u8 *statp) 1117 { 1118 u32 status; 1119 1120 status = __be32_to_cpu(*(__be32 *)statp); 1121 flow_log("SPU response STATUS %#08x\n", status); 1122 if (status & SPU_STATUS_ERROR_FLAG) { 1123 pr_err("%s() Warning: Error result from SPU: %#08x\n", 1124 __func__, status); 1125 if (status & SPU_STATUS_INVALID_ICV) 1126 return SPU_INVALID_ICV; 1127 return -EBADMSG; 1128 } 1129 return 0; 1130 } 1131 1132 /** 1133 * spum_ccm_update_iv() - Update the IV as per the requirements for CCM mode. 1134 * 1135 * @digestsize: Digest size of this request 1136 * @cipher_parms: (pointer to) cipher parmaeters, includes IV buf & IV len 1137 * @assoclen: Length of AAD data 1138 * @chunksize: length of input data to be sent in this req 1139 * @is_encrypt: true if this is an output/encrypt operation 1140 * @is_esp: true if this is an ESP / RFC4309 operation 1141 * 1142 */ 1143 void spum_ccm_update_iv(unsigned int digestsize, 1144 struct spu_cipher_parms *cipher_parms, 1145 unsigned int assoclen, 1146 unsigned int chunksize, 1147 bool is_encrypt, 1148 bool is_esp) 1149 { 1150 u8 L; /* L from CCM algorithm, length of plaintext data */ 1151 u8 mprime; /* M' from CCM algo, (M - 2) / 2, where M=authsize */ 1152 u8 adata; 1153 1154 if (cipher_parms->iv_len != CCM_AES_IV_SIZE) { 1155 pr_err("%s(): Invalid IV len %d for CCM mode, should be %d\n", 1156 __func__, cipher_parms->iv_len, CCM_AES_IV_SIZE); 1157 return; 1158 } 1159 1160 /* 1161 * IV needs to be formatted as follows: 1162 * 1163 * | Byte 0 | Bytes 1 - N | Bytes (N+1) - 15 | 1164 * | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Bits 7 - 0 | Bits 7 - 0 | 1165 * | 0 |Ad?|(M - 2) / 2| L - 1 | Nonce | Plaintext Length | 1166 * 1167 * Ad? = 1 if AAD present, 0 if not present 1168 * M = size of auth field, 8, 12, or 16 bytes (SPU-M) -or- 1169 * 4, 6, 8, 10, 12, 14, 16 bytes (SPU2) 1170 * L = Size of Plaintext Length field; Nonce size = 15 - L 1171 * 1172 * It appears that the crypto API already expects the L-1 portion 1173 * to be set in the first byte of the IV, which implicitly determines 1174 * the nonce size, and also fills in the nonce. But the other bits 1175 * in byte 0 as well as the plaintext length need to be filled in. 1176 * 1177 * In rfc4309/esp mode, L is not already in the supplied IV and 1178 * we need to fill it in, as well as move the IV data to be after 1179 * the salt 1180 */ 1181 if (is_esp) { 1182 L = CCM_ESP_L_VALUE; /* RFC4309 has fixed L */ 1183 } else { 1184 /* L' = plaintext length - 1 so Plaintext length is L' + 1 */ 1185 L = ((cipher_parms->iv_buf[0] & CCM_B0_L_PRIME) >> 1186 CCM_B0_L_PRIME_SHIFT) + 1; 1187 } 1188 1189 mprime = (digestsize - 2) >> 1; /* M' = (M - 2) / 2 */ 1190 adata = (assoclen > 0); /* adata = 1 if any associated data */ 1191 1192 cipher_parms->iv_buf[0] = (adata << CCM_B0_ADATA_SHIFT) | 1193 (mprime << CCM_B0_M_PRIME_SHIFT) | 1194 ((L - 1) << CCM_B0_L_PRIME_SHIFT); 1195 1196 /* Nonce is already filled in by crypto API, and is 15 - L bytes */ 1197 1198 /* Don't include digest in plaintext size when decrypting */ 1199 if (!is_encrypt) 1200 chunksize -= digestsize; 1201 1202 /* Fill in length of plaintext, formatted to be L bytes long */ 1203 format_value_ccm(chunksize, &cipher_parms->iv_buf[15 - L + 1], L); 1204 } 1205 1206 /** 1207 * spum_wordalign_padlen() - Given the length of a data field, determine the 1208 * padding required to align the data following this field on a 4-byte boundary. 1209 * @data_size: length of data field in bytes 1210 * 1211 * Return: length of status field padding, in bytes 1212 */ 1213 u32 spum_wordalign_padlen(u32 data_size) 1214 { 1215 return ((data_size + 3) & ~3) - data_size; 1216 } 1217