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_RC4:
226 cipher_key_len = 260;
227 name = "ARC4";
228 break;
229 case CIPHER_ALG_AES:
230 switch (cipher_type) {
231 case CIPHER_TYPE_AES128:
232 cipher_key_len = 16;
233 name = "AES128";
234 break;
235 case CIPHER_TYPE_AES192:
236 cipher_key_len = 24;
237 name = "AES192";
238 break;
239 case CIPHER_TYPE_AES256:
240 cipher_key_len = 32;
241 name = "AES256";
242 break;
243 }
244 break;
245 case CIPHER_ALG_NONE:
246 break;
247 }
248
249 packet_log(" Cipher Key Type:%s Length:%u Bytes\n",
250 name, cipher_key_len);
251
252 /* XTS has two keys */
253 if (cipher_mode == CIPHER_MODE_XTS) {
254 packet_dump(" KEY2: ", ptr, cipher_key_len);
255 ptr += cipher_key_len;
256 packet_dump(" KEY1: ", ptr, cipher_key_len);
257 ptr += cipher_key_len;
258
259 cipher_key_len *= 2;
260 } else {
261 packet_dump(" KEY: ", ptr, cipher_key_len);
262 ptr += cipher_key_len;
263 }
264
265 if (ecf & SCTX_IV) {
266 sctx_pl_len = sctx_size * sizeof(u32) -
267 sizeof(struct SCTX);
268 iv_len = sctx_pl_len -
269 (hash_key_len + hash_state_len +
270 cipher_key_len);
271 packet_log(" IV Length:%u Bytes\n", iv_len);
272 packet_dump(" IV: ", ptr, iv_len);
273 ptr += iv_len;
274 }
275 }
276 }
277
278 /* ========== Decode BDESC ========== */
279 if (spuh->mh.flags & MH_BDESC_PRES) {
280 #ifdef DEBUG
281 struct BDESC_HEADER *bdesc = (struct BDESC_HEADER *)ptr;
282 #endif
283 packet_log(" BDESC[0] 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
284 packet_log(" OffsetMAC:%u LengthMAC:%u\n",
285 be16_to_cpu(bdesc->offset_mac),
286 be16_to_cpu(bdesc->length_mac));
287 ptr += sizeof(u32);
288
289 packet_log(" BDESC[1] 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
290 packet_log(" OffsetCrypto:%u LengthCrypto:%u\n",
291 be16_to_cpu(bdesc->offset_crypto),
292 be16_to_cpu(bdesc->length_crypto));
293 ptr += sizeof(u32);
294
295 packet_log(" BDESC[2] 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
296 packet_log(" OffsetICV:%u OffsetIV:%u\n",
297 be16_to_cpu(bdesc->offset_icv),
298 be16_to_cpu(bdesc->offset_iv));
299 ptr += sizeof(u32);
300 }
301
302 /* ========== Decode BD ========== */
303 if (spuh->mh.flags & MH_BD_PRES) {
304 #ifdef DEBUG
305 struct BD_HEADER *bd = (struct BD_HEADER *)ptr;
306 #endif
307 packet_log(" BD[0] 0x%08x\n", be32_to_cpu(*((u32 *)ptr)));
308 packet_log(" Size:%ubytes PrevLength:%u\n",
309 be16_to_cpu(bd->size), be16_to_cpu(bd->prev_length));
310 ptr += 4;
311 }
312
313 /* Double check sanity */
314 if (buf + buf_len != ptr) {
315 packet_log(" Packet parsed incorrectly. ");
316 packet_log("buf:%p buf_len:%u buf+buf_len:%p ptr:%p\n",
317 buf, buf_len, buf + buf_len, ptr);
318 }
319
320 packet_log("\n");
321 }
322
323 /**
324 * spum_ns2_ctx_max_payload() - Determine the max length of the payload for a
325 * SPU message for a given cipher and hash alg context.
326 * @cipher_alg: The cipher algorithm
327 * @cipher_mode: The cipher mode
328 * @blocksize: The size of a block of data for this algo
329 *
330 * The max payload must be a multiple of the blocksize so that if a request is
331 * too large to fit in a single SPU message, the request can be broken into
332 * max_payload sized chunks. Each chunk must be a multiple of blocksize.
333 *
334 * Return: Max payload length in bytes
335 */
336 u32 spum_ns2_ctx_max_payload(enum spu_cipher_alg cipher_alg,
337 enum spu_cipher_mode cipher_mode,
338 unsigned int blocksize)
339 {
340 u32 max_payload = SPUM_NS2_MAX_PAYLOAD;
341 u32 excess;
342
343 /* In XTS on SPU-M, we'll need to insert tweak before input data */
344 if (cipher_mode == CIPHER_MODE_XTS)
345 max_payload -= SPU_XTS_TWEAK_SIZE;
346
347 excess = max_payload % blocksize;
348
349 return max_payload - excess;
350 }
351
352 /**
353 * spum_nsp_ctx_max_payload() - Determine the max length of the payload for a
354 * SPU message for a given cipher and hash alg context.
355 * @cipher_alg: The cipher algorithm
356 * @cipher_mode: The cipher mode
357 * @blocksize: The size of a block of data for this algo
358 *
359 * The max payload must be a multiple of the blocksize so that if a request is
360 * too large to fit in a single SPU message, the request can be broken into
361 * max_payload sized chunks. Each chunk must be a multiple of blocksize.
362 *
363 * Return: Max payload length in bytes
364 */
365 u32 spum_nsp_ctx_max_payload(enum spu_cipher_alg cipher_alg,
366 enum spu_cipher_mode cipher_mode,
367 unsigned int blocksize)
368 {
369 u32 max_payload = SPUM_NSP_MAX_PAYLOAD;
370 u32 excess;
371
372 /* In XTS on SPU-M, we'll need to insert tweak before input data */
373 if (cipher_mode == CIPHER_MODE_XTS)
374 max_payload -= SPU_XTS_TWEAK_SIZE;
375
376 excess = max_payload % blocksize;
377
378 return max_payload - excess;
379 }
380
381 /** spum_payload_length() - Given a SPU-M message header, extract the payload
382 * length.
383 * @spu_hdr: Start of SPU header
384 *
385 * Assumes just MH, EMH, BD (no SCTX, BDESC. Works for response frames.
386 *
387 * Return: payload length in bytes
388 */
389 u32 spum_payload_length(u8 *spu_hdr)
390 {
391 struct BD_HEADER *bd;
392 u32 pl_len;
393
394 /* Find BD header. skip MH, EMH */
395 bd = (struct BD_HEADER *)(spu_hdr + 8);
396 pl_len = be16_to_cpu(bd->size);
397
398 return pl_len;
399 }
400
401 /**
402 * spum_response_hdr_len() - Given the length of the hash key and encryption
403 * key, determine the expected length of a SPU response header.
404 * @auth_key_len: authentication key length (bytes)
405 * @enc_key_len: encryption key length (bytes)
406 * @is_hash: true if response message is for a hash operation
407 *
408 * Return: length of SPU response header (bytes)
409 */
410 u16 spum_response_hdr_len(u16 auth_key_len, u16 enc_key_len, bool is_hash)
411 {
412 if (is_hash)
413 return SPU_HASH_RESP_HDR_LEN;
414 else
415 return SPU_RESP_HDR_LEN;
416 }
417
418 /**
419 * spum_hash_pad_len() - Calculate the length of hash padding required to extend
420 * data to a full block size.
421 * @hash_alg: hash algorithm
422 * @hash_mode: hash mode
423 * @chunksize: length of data, in bytes
424 * @hash_block_size: size of a block of data for hash algorithm
425 *
426 * Reserve space for 1 byte (0x80) start of pad and the total length as u64
427 *
428 * Return: length of hash pad in bytes
429 */
430 u16 spum_hash_pad_len(enum hash_alg hash_alg, enum hash_mode hash_mode,
431 u32 chunksize, u16 hash_block_size)
432 {
433 unsigned int length_len;
434 unsigned int used_space_last_block;
435 int hash_pad_len;
436
437 /* AES-XCBC hash requires just padding to next block boundary */
438 if ((hash_alg == HASH_ALG_AES) && (hash_mode == HASH_MODE_XCBC)) {
439 used_space_last_block = chunksize % hash_block_size;
440 hash_pad_len = hash_block_size - used_space_last_block;
441 if (hash_pad_len >= hash_block_size)
442 hash_pad_len -= hash_block_size;
443 return hash_pad_len;
444 }
445
446 used_space_last_block = chunksize % hash_block_size + 1;
447 if ((hash_alg == HASH_ALG_SHA384) || (hash_alg == HASH_ALG_SHA512))
448 length_len = 2 * sizeof(u64);
449 else
450 length_len = sizeof(u64);
451
452 used_space_last_block += length_len;
453 hash_pad_len = hash_block_size - used_space_last_block;
454 if (hash_pad_len < 0)
455 hash_pad_len += hash_block_size;
456
457 hash_pad_len += 1 + length_len;
458 return hash_pad_len;
459 }
460
461 /**
462 * spum_gcm_ccm_pad_len() - Determine the required length of GCM or CCM padding.
463 * @cipher_mode: Algo type
464 * @data_size: Length of plaintext (bytes)
465 *
466 * @Return: Length of padding, in bytes
467 */
468 u32 spum_gcm_ccm_pad_len(enum spu_cipher_mode cipher_mode,
469 unsigned int data_size)
470 {
471 u32 pad_len = 0;
472 u32 m1 = SPU_GCM_CCM_ALIGN - 1;
473
474 if ((cipher_mode == CIPHER_MODE_GCM) ||
475 (cipher_mode == CIPHER_MODE_CCM))
476 pad_len = ((data_size + m1) & ~m1) - data_size;
477
478 return pad_len;
479 }
480
481 /**
482 * spum_assoc_resp_len() - Determine the size of the receive buffer required to
483 * catch associated data.
484 * @cipher_mode: cipher mode
485 * @assoc_len: length of associated data (bytes)
486 * @iv_len: length of IV (bytes)
487 * @is_encrypt: true if encrypting. false if decrypting.
488 *
489 * Return: length of associated data in response message (bytes)
490 */
491 u32 spum_assoc_resp_len(enum spu_cipher_mode cipher_mode,
492 unsigned int assoc_len, unsigned int iv_len,
493 bool is_encrypt)
494 {
495 u32 buflen = 0;
496 u32 pad;
497
498 if (assoc_len)
499 buflen = assoc_len;
500
501 if (cipher_mode == CIPHER_MODE_GCM) {
502 /* AAD needs to be padded in responses too */
503 pad = spum_gcm_ccm_pad_len(cipher_mode, buflen);
504 buflen += pad;
505 }
506 if (cipher_mode == CIPHER_MODE_CCM) {
507 /*
508 * AAD needs to be padded in responses too
509 * for CCM, len + 2 needs to be 128-bit aligned.
510 */
511 pad = spum_gcm_ccm_pad_len(cipher_mode, buflen + 2);
512 buflen += pad;
513 }
514
515 return buflen;
516 }
517
518 /**
519 * spu_aead_ivlen() - Calculate the length of the AEAD IV to be included
520 * in a SPU request after the AAD and before the payload.
521 * @cipher_mode: cipher mode
522 * @iv_ctr_len: initialization vector length in bytes
523 *
524 * In Linux ~4.2 and later, the assoc_data sg includes the IV. So no need
525 * to include the IV as a separate field in the SPU request msg.
526 *
527 * Return: Length of AEAD IV in bytes
528 */
529 u8 spum_aead_ivlen(enum spu_cipher_mode cipher_mode, u16 iv_len)
530 {
531 return 0;
532 }
533
534 /**
535 * spum_hash_type() - Determine the type of hash operation.
536 * @src_sent: The number of bytes in the current request that have already
537 * been sent to the SPU to be hashed.
538 *
539 * We do not use HASH_TYPE_FULL for requests that fit in a single SPU message.
540 * Using FULL causes failures (such as when the string to be hashed is empty).
541 * For similar reasons, we never use HASH_TYPE_FIN. Instead, submit messages
542 * as INIT or UPDT and do the hash padding in sw.
543 */
544 enum hash_type spum_hash_type(u32 src_sent)
545 {
546 return src_sent ? HASH_TYPE_UPDT : HASH_TYPE_INIT;
547 }
548
549 /**
550 * spum_digest_size() - Determine the size of a hash digest to expect the SPU to
551 * return.
552 * alg_digest_size: Number of bytes in the final digest for the given algo
553 * alg: The hash algorithm
554 * htype: Type of hash operation (init, update, full, etc)
555 *
556 * When doing incremental hashing for an algorithm with a truncated hash
557 * (e.g., SHA224), the SPU returns the full digest so that it can be fed back as
558 * a partial result for the next chunk.
559 */
560 u32 spum_digest_size(u32 alg_digest_size, enum hash_alg alg,
561 enum hash_type htype)
562 {
563 u32 digestsize = alg_digest_size;
564
565 /* SPU returns complete digest when doing incremental hash and truncated
566 * hash algo.
567 */
568 if ((htype == HASH_TYPE_INIT) || (htype == HASH_TYPE_UPDT)) {
569 if (alg == HASH_ALG_SHA224)
570 digestsize = SHA256_DIGEST_SIZE;
571 else if (alg == HASH_ALG_SHA384)
572 digestsize = SHA512_DIGEST_SIZE;
573 }
574 return digestsize;
575 }
576
577 /**
578 * spum_create_request() - Build a SPU request message header, up to and
579 * including the BD header. Construct the message starting at spu_hdr. Caller
580 * should allocate this buffer in DMA-able memory at least SPU_HEADER_ALLOC_LEN
581 * bytes long.
582 * @spu_hdr: Start of buffer where SPU request header is to be written
583 * @req_opts: SPU request message options
584 * @cipher_parms: Parameters related to cipher algorithm
585 * @hash_parms: Parameters related to hash algorithm
586 * @aead_parms: Parameters related to AEAD operation
587 * @data_size: Length of data to be encrypted or authenticated. If AEAD, does
588 * not include length of AAD.
589
590 * Return: the length of the SPU header in bytes. 0 if an error occurs.
591 */
592 u32 spum_create_request(u8 *spu_hdr,
593 struct spu_request_opts *req_opts,
594 struct spu_cipher_parms *cipher_parms,
595 struct spu_hash_parms *hash_parms,
596 struct spu_aead_parms *aead_parms,
597 unsigned int data_size)
598 {
599 struct SPUHEADER *spuh;
600 struct BDESC_HEADER *bdesc;
601 struct BD_HEADER *bd;
602
603 u8 *ptr;
604 u32 protocol_bits = 0;
605 u32 cipher_bits = 0;
606 u32 ecf_bits = 0;
607 u8 sctx_words = 0;
608 unsigned int buf_len = 0;
609
610 /* size of the cipher payload */
611 unsigned int cipher_len = hash_parms->prebuf_len + data_size +
612 hash_parms->pad_len;
613
614 /* offset of prebuf or data from end of BD header */
615 unsigned int cipher_offset = aead_parms->assoc_size +
616 aead_parms->iv_len + aead_parms->aad_pad_len;
617
618 /* total size of the DB data (without STAT word padding) */
619 unsigned int real_db_size = spu_real_db_size(aead_parms->assoc_size,
620 aead_parms->iv_len,
621 hash_parms->prebuf_len,
622 data_size,
623 aead_parms->aad_pad_len,
624 aead_parms->data_pad_len,
625 hash_parms->pad_len);
626
627 unsigned int auth_offset = 0;
628 unsigned int offset_iv = 0;
629
630 /* size/offset of the auth payload */
631 unsigned int auth_len;
632
633 auth_len = real_db_size;
634
635 if (req_opts->is_aead && req_opts->is_inbound)
636 cipher_len -= hash_parms->digestsize;
637
638 if (req_opts->is_aead && req_opts->is_inbound)
639 auth_len -= hash_parms->digestsize;
640
641 if ((hash_parms->alg == HASH_ALG_AES) &&
642 (hash_parms->mode == HASH_MODE_XCBC)) {
643 auth_len -= hash_parms->pad_len;
644 cipher_len -= hash_parms->pad_len;
645 }
646
647 flow_log("%s()\n", __func__);
648 flow_log(" in:%u authFirst:%u\n",
649 req_opts->is_inbound, req_opts->auth_first);
650 flow_log(" %s. cipher alg:%u mode:%u type %u\n",
651 spu_alg_name(cipher_parms->alg, cipher_parms->mode),
652 cipher_parms->alg, cipher_parms->mode, cipher_parms->type);
653 flow_log(" key: %d\n", cipher_parms->key_len);
654 flow_dump(" key: ", cipher_parms->key_buf, cipher_parms->key_len);
655 flow_log(" iv: %d\n", cipher_parms->iv_len);
656 flow_dump(" iv: ", cipher_parms->iv_buf, cipher_parms->iv_len);
657 flow_log(" auth alg:%u mode:%u type %u\n",
658 hash_parms->alg, hash_parms->mode, hash_parms->type);
659 flow_log(" digestsize: %u\n", hash_parms->digestsize);
660 flow_log(" authkey: %d\n", hash_parms->key_len);
661 flow_dump(" authkey: ", hash_parms->key_buf, hash_parms->key_len);
662 flow_log(" assoc_size:%u\n", aead_parms->assoc_size);
663 flow_log(" prebuf_len:%u\n", hash_parms->prebuf_len);
664 flow_log(" data_size:%u\n", data_size);
665 flow_log(" hash_pad_len:%u\n", hash_parms->pad_len);
666 flow_log(" real_db_size:%u\n", real_db_size);
667 flow_log(" auth_offset:%u auth_len:%u cipher_offset:%u cipher_len:%u\n",
668 auth_offset, auth_len, cipher_offset, cipher_len);
669 flow_log(" aead_iv: %u\n", aead_parms->iv_len);
670
671 /* starting out: zero the header (plus some) */
672 ptr = spu_hdr;
673 memset(ptr, 0, sizeof(struct SPUHEADER));
674
675 /* format master header word */
676 /* Do not set the next bit even though the datasheet says to */
677 spuh = (struct SPUHEADER *)ptr;
678 ptr += sizeof(struct SPUHEADER);
679 buf_len += sizeof(struct SPUHEADER);
680
681 spuh->mh.op_code = SPU_CRYPTO_OPERATION_GENERIC;
682 spuh->mh.flags |= (MH_SCTX_PRES | MH_BDESC_PRES | MH_BD_PRES);
683
684 /* Format sctx word 0 (protocol_bits) */
685 sctx_words = 3; /* size in words */
686
687 /* Format sctx word 1 (cipher_bits) */
688 if (req_opts->is_inbound)
689 cipher_bits |= CIPHER_INBOUND;
690 if (req_opts->auth_first)
691 cipher_bits |= CIPHER_ORDER;
692
693 /* Set the crypto parameters in the cipher.flags */
694 cipher_bits |= cipher_parms->alg << CIPHER_ALG_SHIFT;
695 cipher_bits |= cipher_parms->mode << CIPHER_MODE_SHIFT;
696 cipher_bits |= cipher_parms->type << CIPHER_TYPE_SHIFT;
697
698 /* Set the auth parameters in the cipher.flags */
699 cipher_bits |= hash_parms->alg << HASH_ALG_SHIFT;
700 cipher_bits |= hash_parms->mode << HASH_MODE_SHIFT;
701 cipher_bits |= hash_parms->type << HASH_TYPE_SHIFT;
702
703 /*
704 * Format sctx extensions if required, and update main fields if
705 * required)
706 */
707 if (hash_parms->alg) {
708 /* Write the authentication key material if present */
709 if (hash_parms->key_len) {
710 memcpy(ptr, hash_parms->key_buf, hash_parms->key_len);
711 ptr += hash_parms->key_len;
712 buf_len += hash_parms->key_len;
713 sctx_words += hash_parms->key_len / 4;
714 }
715
716 if ((cipher_parms->mode == CIPHER_MODE_GCM) ||
717 (cipher_parms->mode == CIPHER_MODE_CCM))
718 /* unpadded length */
719 offset_iv = aead_parms->assoc_size;
720
721 /* if GCM/CCM we need to write ICV into the payload */
722 if (!req_opts->is_inbound) {
723 if ((cipher_parms->mode == CIPHER_MODE_GCM) ||
724 (cipher_parms->mode == CIPHER_MODE_CCM))
725 ecf_bits |= 1 << INSERT_ICV_SHIFT;
726 } else {
727 ecf_bits |= CHECK_ICV;
728 }
729
730 /* Inform the SPU of the ICV size (in words) */
731 if (hash_parms->digestsize == 64)
732 cipher_bits |= ICV_IS_512;
733 else
734 ecf_bits |=
735 (hash_parms->digestsize / 4) << ICV_SIZE_SHIFT;
736 }
737
738 if (req_opts->bd_suppress)
739 ecf_bits |= BD_SUPPRESS;
740
741 /* copy the encryption keys in the SAD entry */
742 if (cipher_parms->alg) {
743 if (cipher_parms->key_len) {
744 memcpy(ptr, cipher_parms->key_buf,
745 cipher_parms->key_len);
746 ptr += cipher_parms->key_len;
747 buf_len += cipher_parms->key_len;
748 sctx_words += cipher_parms->key_len / 4;
749 }
750
751 /*
752 * if encrypting then set IV size, use SCTX IV unless no IV
753 * given here
754 */
755 if (cipher_parms->iv_buf && cipher_parms->iv_len) {
756 /* Use SCTX IV */
757 ecf_bits |= SCTX_IV;
758
759 /* cipher iv provided so put it in here */
760 memcpy(ptr, cipher_parms->iv_buf, cipher_parms->iv_len);
761
762 ptr += cipher_parms->iv_len;
763 buf_len += cipher_parms->iv_len;
764 sctx_words += cipher_parms->iv_len / 4;
765 }
766 }
767
768 /*
769 * RFC4543 (GMAC/ESP) requires data to be sent as part of AAD
770 * so we need to override the BDESC parameters.
771 */
772 if (req_opts->is_rfc4543) {
773 if (req_opts->is_inbound)
774 data_size -= hash_parms->digestsize;
775 offset_iv = aead_parms->assoc_size + data_size;
776 cipher_len = 0;
777 cipher_offset = offset_iv;
778 auth_len = cipher_offset + aead_parms->data_pad_len;
779 }
780
781 /* write in the total sctx length now that we know it */
782 protocol_bits |= sctx_words;
783
784 /* Endian adjust the SCTX */
785 spuh->sa.proto_flags = cpu_to_be32(protocol_bits);
786 spuh->sa.cipher_flags = cpu_to_be32(cipher_bits);
787 spuh->sa.ecf = cpu_to_be32(ecf_bits);
788
789 /* === create the BDESC section === */
790 bdesc = (struct BDESC_HEADER *)ptr;
791
792 bdesc->offset_mac = cpu_to_be16(auth_offset);
793 bdesc->length_mac = cpu_to_be16(auth_len);
794 bdesc->offset_crypto = cpu_to_be16(cipher_offset);
795 bdesc->length_crypto = cpu_to_be16(cipher_len);
796
797 /*
798 * CCM in SPU-M requires that ICV not be in same 32-bit word as data or
799 * padding. So account for padding as necessary.
800 */
801 if (cipher_parms->mode == CIPHER_MODE_CCM)
802 auth_len += spum_wordalign_padlen(auth_len);
803
804 bdesc->offset_icv = cpu_to_be16(auth_len);
805 bdesc->offset_iv = cpu_to_be16(offset_iv);
806
807 ptr += sizeof(struct BDESC_HEADER);
808 buf_len += sizeof(struct BDESC_HEADER);
809
810 /* === no MFM section === */
811
812 /* === create the BD section === */
813
814 /* add the BD header */
815 bd = (struct BD_HEADER *)ptr;
816 bd->size = cpu_to_be16(real_db_size);
817 bd->prev_length = 0;
818
819 ptr += sizeof(struct BD_HEADER);
820 buf_len += sizeof(struct BD_HEADER);
821
822 packet_dump(" SPU request header: ", spu_hdr, buf_len);
823
824 return buf_len;
825 }
826
827 /**
828 * spum_cipher_req_init() - Build a SPU request message header, up to and
829 * including the BD header.
830 * @spu_hdr: Start of SPU request header (MH)
831 * @cipher_parms: Parameters that describe the cipher request
832 *
833 * Construct the message starting at spu_hdr. Caller should allocate this buffer
834 * in DMA-able memory at least SPU_HEADER_ALLOC_LEN bytes long.
835 *
836 * Return: the length of the SPU header in bytes. 0 if an error occurs.
837 */
838 u16 spum_cipher_req_init(u8 *spu_hdr, struct spu_cipher_parms *cipher_parms)
839 {
840 struct SPUHEADER *spuh;
841 u32 protocol_bits = 0;
842 u32 cipher_bits = 0;
843 u32 ecf_bits = 0;
844 u8 sctx_words = 0;
845 u8 *ptr = spu_hdr;
846
847 flow_log("%s()\n", __func__);
848 flow_log(" cipher alg:%u mode:%u type %u\n", cipher_parms->alg,
849 cipher_parms->mode, cipher_parms->type);
850 flow_log(" cipher_iv_len: %u\n", cipher_parms->iv_len);
851 flow_log(" key: %d\n", cipher_parms->key_len);
852 flow_dump(" key: ", cipher_parms->key_buf, cipher_parms->key_len);
853
854 /* starting out: zero the header (plus some) */
855 memset(spu_hdr, 0, sizeof(struct SPUHEADER));
856 ptr += sizeof(struct SPUHEADER);
857
858 /* format master header word */
859 /* Do not set the next bit even though the datasheet says to */
860 spuh = (struct SPUHEADER *)spu_hdr;
861
862 spuh->mh.op_code = SPU_CRYPTO_OPERATION_GENERIC;
863 spuh->mh.flags |= (MH_SCTX_PRES | MH_BDESC_PRES | MH_BD_PRES);
864
865 /* Format sctx word 0 (protocol_bits) */
866 sctx_words = 3; /* size in words */
867
868 /* copy the encryption keys in the SAD entry */
869 if (cipher_parms->alg) {
870 if (cipher_parms->key_len) {
871 ptr += cipher_parms->key_len;
872 sctx_words += cipher_parms->key_len / 4;
873 }
874
875 /*
876 * if encrypting then set IV size, use SCTX IV unless no IV
877 * given here
878 */
879 if (cipher_parms->iv_len) {
880 /* Use SCTX IV */
881 ecf_bits |= SCTX_IV;
882 ptr += cipher_parms->iv_len;
883 sctx_words += cipher_parms->iv_len / 4;
884 }
885 }
886
887 /* Set the crypto parameters in the cipher.flags */
888 cipher_bits |= cipher_parms->alg << CIPHER_ALG_SHIFT;
889 cipher_bits |= cipher_parms->mode << CIPHER_MODE_SHIFT;
890 cipher_bits |= cipher_parms->type << CIPHER_TYPE_SHIFT;
891
892 /* copy the encryption keys in the SAD entry */
893 if (cipher_parms->alg && cipher_parms->key_len)
894 memcpy(spuh + 1, cipher_parms->key_buf, cipher_parms->key_len);
895
896 /* write in the total sctx length now that we know it */
897 protocol_bits |= sctx_words;
898
899 /* Endian adjust the SCTX */
900 spuh->sa.proto_flags = cpu_to_be32(protocol_bits);
901
902 /* Endian adjust the SCTX */
903 spuh->sa.cipher_flags = cpu_to_be32(cipher_bits);
904 spuh->sa.ecf = cpu_to_be32(ecf_bits);
905
906 packet_dump(" SPU request header: ", spu_hdr,
907 sizeof(struct SPUHEADER));
908
909 return sizeof(struct SPUHEADER) + cipher_parms->key_len +
910 cipher_parms->iv_len + sizeof(struct BDESC_HEADER) +
911 sizeof(struct BD_HEADER);
912 }
913
914 /**
915 * spum_cipher_req_finish() - Finish building a SPU request message header for a
916 * block cipher request. Assumes much of the header was already filled in at
917 * setkey() time in spu_cipher_req_init().
918 * @spu_hdr: Start of the request message header (MH field)
919 * @spu_req_hdr_len: Length in bytes of the SPU request header
920 * @isInbound: 0 encrypt, 1 decrypt
921 * @cipher_parms: Parameters describing cipher operation to be performed
922 * @update_key: If true, rewrite the cipher key in SCTX
923 * @data_size: Length of the data in the BD field
924 *
925 * Assumes much of the header was already filled in at setkey() time in
926 * spum_cipher_req_init().
927 * spum_cipher_req_init() fills in the encryption key. For RC4, when submitting
928 * a request for a non-first chunk, we use the 260-byte SUPDT field from the
929 * previous response as the key. update_key is true for this case. Unused in all
930 * other cases.
931 */
932 void spum_cipher_req_finish(u8 *spu_hdr,
933 u16 spu_req_hdr_len,
934 unsigned int is_inbound,
935 struct spu_cipher_parms *cipher_parms,
936 bool update_key,
937 unsigned int data_size)
938 {
939 struct SPUHEADER *spuh;
940 struct BDESC_HEADER *bdesc;
941 struct BD_HEADER *bd;
942 u8 *bdesc_ptr = spu_hdr + spu_req_hdr_len -
943 (sizeof(struct BD_HEADER) + sizeof(struct BDESC_HEADER));
944
945 u32 cipher_bits;
946
947 flow_log("%s()\n", __func__);
948 flow_log(" in: %u\n", is_inbound);
949 flow_log(" cipher alg: %u, cipher_type: %u\n", cipher_parms->alg,
950 cipher_parms->type);
951 if (update_key) {
952 flow_log(" cipher key len: %u\n", cipher_parms->key_len);
953 flow_dump(" key: ", cipher_parms->key_buf,
954 cipher_parms->key_len);
955 }
956
957 /*
958 * In XTS mode, API puts "i" parameter (block tweak) in IV. For
959 * SPU-M, should be in start of the BD; tx_sg_create() copies it there.
960 * IV in SPU msg for SPU-M should be 0, since that's the "j" parameter
961 * (block ctr within larger data unit) - given we can send entire disk
962 * block (<= 4KB) in 1 SPU msg, don't need to use this parameter.
963 */
964 if (cipher_parms->mode == CIPHER_MODE_XTS)
965 memset(cipher_parms->iv_buf, 0, cipher_parms->iv_len);
966
967 flow_log(" iv len: %d\n", cipher_parms->iv_len);
968 flow_dump(" iv: ", cipher_parms->iv_buf, cipher_parms->iv_len);
969 flow_log(" data_size: %u\n", data_size);
970
971 /* format master header word */
972 /* Do not set the next bit even though the datasheet says to */
973 spuh = (struct SPUHEADER *)spu_hdr;
974
975 /* cipher_bits was initialized at setkey time */
976 cipher_bits = be32_to_cpu(spuh->sa.cipher_flags);
977
978 /* Format sctx word 1 (cipher_bits) */
979 if (is_inbound)
980 cipher_bits |= CIPHER_INBOUND;
981 else
982 cipher_bits &= ~CIPHER_INBOUND;
983
984 /* update encryption key for RC4 on non-first chunk */
985 if (update_key) {
986 spuh->sa.cipher_flags |=
987 cipher_parms->type << CIPHER_TYPE_SHIFT;
988 memcpy(spuh + 1, cipher_parms->key_buf, cipher_parms->key_len);
989 }
990
991 if (cipher_parms->alg && cipher_parms->iv_buf && cipher_parms->iv_len)
992 /* cipher iv provided so put it in here */
993 memcpy(bdesc_ptr - cipher_parms->iv_len, cipher_parms->iv_buf,
994 cipher_parms->iv_len);
995
996 spuh->sa.cipher_flags = cpu_to_be32(cipher_bits);
997
998 /* === create the BDESC section === */
999 bdesc = (struct BDESC_HEADER *)bdesc_ptr;
1000 bdesc->offset_mac = 0;
1001 bdesc->length_mac = 0;
1002 bdesc->offset_crypto = 0;
1003
1004 /* XTS mode, data_size needs to include tweak parameter */
1005 if (cipher_parms->mode == CIPHER_MODE_XTS)
1006 bdesc->length_crypto = cpu_to_be16(data_size +
1007 SPU_XTS_TWEAK_SIZE);
1008 else
1009 bdesc->length_crypto = cpu_to_be16(data_size);
1010
1011 bdesc->offset_icv = 0;
1012 bdesc->offset_iv = 0;
1013
1014 /* === no MFM section === */
1015
1016 /* === create the BD section === */
1017 /* add the BD header */
1018 bd = (struct BD_HEADER *)(bdesc_ptr + sizeof(struct BDESC_HEADER));
1019 bd->size = cpu_to_be16(data_size);
1020
1021 /* XTS mode, data_size needs to include tweak parameter */
1022 if (cipher_parms->mode == CIPHER_MODE_XTS)
1023 bd->size = cpu_to_be16(data_size + SPU_XTS_TWEAK_SIZE);
1024 else
1025 bd->size = cpu_to_be16(data_size);
1026
1027 bd->prev_length = 0;
1028
1029 packet_dump(" SPU request header: ", spu_hdr, spu_req_hdr_len);
1030 }
1031
1032 /**
1033 * spum_request_pad() - Create pad bytes at the end of the data.
1034 * @pad_start: Start of buffer where pad bytes are to be written
1035 * @gcm_ccm_padding: length of GCM/CCM padding, in bytes
1036 * @hash_pad_len: Number of bytes of padding extend data to full block
1037 * @auth_alg: authentication algorithm
1038 * @auth_mode: authentication mode
1039 * @total_sent: length inserted at end of hash pad
1040 * @status_padding: Number of bytes of padding to align STATUS word
1041 *
1042 * There may be three forms of pad:
1043 * 1. GCM/CCM pad - for GCM/CCM mode ciphers, pad to 16-byte alignment
1044 * 2. hash pad - pad to a block length, with 0x80 data terminator and
1045 * size at the end
1046 * 3. STAT pad - to ensure the STAT field is 4-byte aligned
1047 */
1048 void spum_request_pad(u8 *pad_start,
1049 u32 gcm_ccm_padding,
1050 u32 hash_pad_len,
1051 enum hash_alg auth_alg,
1052 enum hash_mode auth_mode,
1053 unsigned int total_sent, u32 status_padding)
1054 {
1055 u8 *ptr = pad_start;
1056
1057 /* fix data alignent for GCM/CCM */
1058 if (gcm_ccm_padding > 0) {
1059 flow_log(" GCM: padding to 16 byte alignment: %u bytes\n",
1060 gcm_ccm_padding);
1061 memset(ptr, 0, gcm_ccm_padding);
1062 ptr += gcm_ccm_padding;
1063 }
1064
1065 if (hash_pad_len > 0) {
1066 /* clear the padding section */
1067 memset(ptr, 0, hash_pad_len);
1068
1069 if ((auth_alg == HASH_ALG_AES) &&
1070 (auth_mode == HASH_MODE_XCBC)) {
1071 /* AES/XCBC just requires padding to be 0s */
1072 ptr += hash_pad_len;
1073 } else {
1074 /* terminate the data */
1075 *ptr = 0x80;
1076 ptr += (hash_pad_len - sizeof(u64));
1077
1078 /* add the size at the end as required per alg */
1079 if (auth_alg == HASH_ALG_MD5)
1080 *(u64 *)ptr = cpu_to_le64((u64)total_sent * 8);
1081 else /* SHA1, SHA2-224, SHA2-256 */
1082 *(u64 *)ptr = cpu_to_be64((u64)total_sent * 8);
1083 ptr += sizeof(u64);
1084 }
1085 }
1086
1087 /* pad to a 4byte alignment for STAT */
1088 if (status_padding > 0) {
1089 flow_log(" STAT: padding to 4 byte alignment: %u bytes\n",
1090 status_padding);
1091
1092 memset(ptr, 0, status_padding);
1093 ptr += status_padding;
1094 }
1095 }
1096
1097 /**
1098 * spum_xts_tweak_in_payload() - Indicate that SPUM DOES place the XTS tweak
1099 * field in the packet payload (rather than using IV)
1100 *
1101 * Return: 1
1102 */
1103 u8 spum_xts_tweak_in_payload(void)
1104 {
1105 return 1;
1106 }
1107
1108 /**
1109 * spum_tx_status_len() - Return the length of the STATUS field in a SPU
1110 * response message.
1111 *
1112 * Return: Length of STATUS field in bytes.
1113 */
1114 u8 spum_tx_status_len(void)
1115 {
1116 return SPU_TX_STATUS_LEN;
1117 }
1118
1119 /**
1120 * spum_rx_status_len() - Return the length of the STATUS field in a SPU
1121 * response message.
1122 *
1123 * Return: Length of STATUS field in bytes.
1124 */
1125 u8 spum_rx_status_len(void)
1126 {
1127 return SPU_RX_STATUS_LEN;
1128 }
1129
1130 /**
1131 * spum_status_process() - Process the status from a SPU response message.
1132 * @statp: start of STATUS word
1133 * Return:
1134 * 0 - if status is good and response should be processed
1135 * !0 - status indicates an error and response is invalid
1136 */
1137 int spum_status_process(u8 *statp)
1138 {
1139 u32 status;
1140
1141 status = __be32_to_cpu(*(__be32 *)statp);
1142 flow_log("SPU response STATUS %#08x\n", status);
1143 if (status & SPU_STATUS_ERROR_FLAG) {
1144 pr_err("%s() Warning: Error result from SPU: %#08x\n",
1145 __func__, status);
1146 if (status & SPU_STATUS_INVALID_ICV)
1147 return SPU_INVALID_ICV;
1148 return -EBADMSG;
1149 }
1150 return 0;
1151 }
1152
1153 /**
1154 * spum_ccm_update_iv() - Update the IV as per the requirements for CCM mode.
1155 *
1156 * @digestsize: Digest size of this request
1157 * @cipher_parms: (pointer to) cipher parmaeters, includes IV buf & IV len
1158 * @assoclen: Length of AAD data
1159 * @chunksize: length of input data to be sent in this req
1160 * @is_encrypt: true if this is an output/encrypt operation
1161 * @is_esp: true if this is an ESP / RFC4309 operation
1162 *
1163 */
1164 void spum_ccm_update_iv(unsigned int digestsize,
1165 struct spu_cipher_parms *cipher_parms,
1166 unsigned int assoclen,
1167 unsigned int chunksize,
1168 bool is_encrypt,
1169 bool is_esp)
1170 {
1171 u8 L; /* L from CCM algorithm, length of plaintext data */
1172 u8 mprime; /* M' from CCM algo, (M - 2) / 2, where M=authsize */
1173 u8 adata;
1174
1175 if (cipher_parms->iv_len != CCM_AES_IV_SIZE) {
1176 pr_err("%s(): Invalid IV len %d for CCM mode, should be %d\n",
1177 __func__, cipher_parms->iv_len, CCM_AES_IV_SIZE);
1178 return;
1179 }
1180
1181 /*
1182 * IV needs to be formatted as follows:
1183 *
1184 * | Byte 0 | Bytes 1 - N | Bytes (N+1) - 15 |
1185 * | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | Bits 7 - 0 | Bits 7 - 0 |
1186 * | 0 |Ad?|(M - 2) / 2| L - 1 | Nonce | Plaintext Length |
1187 *
1188 * Ad? = 1 if AAD present, 0 if not present
1189 * M = size of auth field, 8, 12, or 16 bytes (SPU-M) -or-
1190 * 4, 6, 8, 10, 12, 14, 16 bytes (SPU2)
1191 * L = Size of Plaintext Length field; Nonce size = 15 - L
1192 *
1193 * It appears that the crypto API already expects the L-1 portion
1194 * to be set in the first byte of the IV, which implicitly determines
1195 * the nonce size, and also fills in the nonce. But the other bits
1196 * in byte 0 as well as the plaintext length need to be filled in.
1197 *
1198 * In rfc4309/esp mode, L is not already in the supplied IV and
1199 * we need to fill it in, as well as move the IV data to be after
1200 * the salt
1201 */
1202 if (is_esp) {
1203 L = CCM_ESP_L_VALUE; /* RFC4309 has fixed L */
1204 } else {
1205 /* L' = plaintext length - 1 so Plaintext length is L' + 1 */
1206 L = ((cipher_parms->iv_buf[0] & CCM_B0_L_PRIME) >>
1207 CCM_B0_L_PRIME_SHIFT) + 1;
1208 }
1209
1210 mprime = (digestsize - 2) >> 1; /* M' = (M - 2) / 2 */
1211 adata = (assoclen > 0); /* adata = 1 if any associated data */
1212
1213 cipher_parms->iv_buf[0] = (adata << CCM_B0_ADATA_SHIFT) |
1214 (mprime << CCM_B0_M_PRIME_SHIFT) |
1215 ((L - 1) << CCM_B0_L_PRIME_SHIFT);
1216
1217 /* Nonce is already filled in by crypto API, and is 15 - L bytes */
1218
1219 /* Don't include digest in plaintext size when decrypting */
1220 if (!is_encrypt)
1221 chunksize -= digestsize;
1222
1223 /* Fill in length of plaintext, formatted to be L bytes long */
1224 format_value_ccm(chunksize, &cipher_parms->iv_buf[15 - L + 1], L);
1225 }
1226
1227 /**
1228 * spum_wordalign_padlen() - Given the length of a data field, determine the
1229 * padding required to align the data following this field on a 4-byte boundary.
1230 * @data_size: length of data field in bytes
1231 *
1232 * Return: length of status field padding, in bytes
1233 */
1234 u32 spum_wordalign_padlen(u32 data_size)
1235 {
1236 return ((data_size + 3) & ~3) - data_size;
1237 }