crypto4xx_alg.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * AMCC SoC PPC4xx Crypto Driver
  4 *
  5 * Copyright (c) 2008 Applied Micro Circuits Corporation.
  6 * All rights reserved. James Hsiao <jhsiao@amcc.com>
  7 *
  8 * This file implements the Linux crypto algorithms.
  9 */
 10
 11#include <linux/kernel.h>
 12#include <linux/interrupt.h>
 13#include <linux/spinlock_types.h>
 14#include <linux/scatterlist.h>
 15#include <linux/dma-mapping.h>
 16#include <crypto/algapi.h>
 17#include <crypto/aead.h>
 18#include <crypto/aes.h>
 19#include <crypto/gcm.h>
 20#include <crypto/sha1.h>
 21#include <crypto/ctr.h>
 22#include <crypto/skcipher.h>
 23#include "crypto4xx_reg_def.h"
 24#include "crypto4xx_core.h"
 25#include "crypto4xx_sa.h"
 26
 27static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
 28				     u32 save_iv, u32 ld_h, u32 ld_iv,
 29				     u32 hdr_proc, u32 h, u32 c, u32 pad_type,
 30				     u32 op_grp, u32 op, u32 dir)
 31{
 32	sa->sa_command_0.w = 0;
 33	sa->sa_command_0.bf.save_hash_state = save_h;
 34	sa->sa_command_0.bf.save_iv = save_iv;
 35	sa->sa_command_0.bf.load_hash_state = ld_h;
 36	sa->sa_command_0.bf.load_iv = ld_iv;
 37	sa->sa_command_0.bf.hdr_proc = hdr_proc;
 38	sa->sa_command_0.bf.hash_alg = h;
 39	sa->sa_command_0.bf.cipher_alg = c;
 40	sa->sa_command_0.bf.pad_type = pad_type & 3;
 41	sa->sa_command_0.bf.extend_pad = pad_type >> 2;
 42	sa->sa_command_0.bf.op_group = op_grp;
 43	sa->sa_command_0.bf.opcode = op;
 44	sa->sa_command_0.bf.dir = dir;
 45}
 46
 47static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm,
 48				     u32 hmac_mc, u32 cfb, u32 esn,
 49				     u32 sn_mask, u32 mute, u32 cp_pad,
 50				     u32 cp_pay, u32 cp_hdr)
 51{
 52	sa->sa_command_1.w = 0;
 53	sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
 54	sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
 55	sa->sa_command_1.bf.feedback_mode = cfb;
 56	sa->sa_command_1.bf.sa_rev = 1;
 57	sa->sa_command_1.bf.hmac_muting = hmac_mc;
 58	sa->sa_command_1.bf.extended_seq_num = esn;
 59	sa->sa_command_1.bf.seq_num_mask = sn_mask;
 60	sa->sa_command_1.bf.mutable_bit_proc = mute;
 61	sa->sa_command_1.bf.copy_pad = cp_pad;
 62	sa->sa_command_1.bf.copy_payload = cp_pay;
 63	sa->sa_command_1.bf.copy_hdr = cp_hdr;
 64}
 65
 66static inline int crypto4xx_crypt(struct skcipher_request *req,
 67				  const unsigned int ivlen, bool decrypt,
 68				  bool check_blocksize)
 69{
 70	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
 71	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
 72	__le32 iv[AES_IV_SIZE / 4];
 73
 74	if (check_blocksize && !IS_ALIGNED(req->cryptlen, AES_BLOCK_SIZE))
 75		return -EINVAL;
 76
 77	if (ivlen)
 78		crypto4xx_memcpy_to_le32(iv, req->iv, ivlen);
 79
 80	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 81		req->cryptlen, iv, ivlen, decrypt ? ctx->sa_in : ctx->sa_out,
 82		ctx->sa_len, 0, NULL);
 83}
 84
 85int crypto4xx_encrypt_noiv_block(struct skcipher_request *req)
 86{
 87	return crypto4xx_crypt(req, 0, false, true);
 88}
 89
 90int crypto4xx_encrypt_iv_stream(struct skcipher_request *req)
 91{
 92	return crypto4xx_crypt(req, AES_IV_SIZE, false, false);
 93}
 94
 95int crypto4xx_decrypt_noiv_block(struct skcipher_request *req)
 96{
 97	return crypto4xx_crypt(req, 0, true, true);
 98}
 99
100int crypto4xx_decrypt_iv_stream(struct skcipher_request *req)
101{
102	return crypto4xx_crypt(req, AES_IV_SIZE, true, false);
103}
104
105int crypto4xx_encrypt_iv_block(struct skcipher_request *req)
106{
107	return crypto4xx_crypt(req, AES_IV_SIZE, false, true);
108}
109
110int crypto4xx_decrypt_iv_block(struct skcipher_request *req)
111{
112	return crypto4xx_crypt(req, AES_IV_SIZE, true, true);
113}
114
115/*
116 * AES Functions
117 */
118static int crypto4xx_setkey_aes(struct crypto_skcipher *cipher,
119				const u8 *key,
120				unsigned int keylen,
121				unsigned char cm,
122				u8 fb)
123{
124	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
125	struct dynamic_sa_ctl *sa;
126	int    rc;
127
128	if (keylen != AES_KEYSIZE_256 && keylen != AES_KEYSIZE_192 &&
129	    keylen != AES_KEYSIZE_128)
130		return -EINVAL;
131
132	/* Create SA */
133	if (ctx->sa_in || ctx->sa_out)
134		crypto4xx_free_sa(ctx);
135
136	rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
137	if (rc)
138		return rc;
139
140	/* Setup SA */
141	sa = ctx->sa_in;
142
143	set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, (cm == CRYPTO_MODE_ECB ?
144				 SA_NOT_SAVE_IV : SA_SAVE_IV),
145				 SA_NOT_LOAD_HASH, (cm == CRYPTO_MODE_ECB ?
146				 SA_LOAD_IV_FROM_SA : SA_LOAD_IV_FROM_STATE),
147				 SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
148				 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
149				 SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
150				 DIR_INBOUND);
151
152	set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
153				 fb, SA_EXTENDED_SN_OFF,
154				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
155				 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
156				 SA_NOT_COPY_HDR);
157	crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
158				 key, keylen);
159	sa->sa_contents.w = SA_AES_CONTENTS | (keylen << 2);
160	sa->sa_command_1.bf.key_len = keylen >> 3;
161
162	memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
163	sa = ctx->sa_out;
164	sa->sa_command_0.bf.dir = DIR_OUTBOUND;
165	/*
166	 * SA_OPCODE_ENCRYPT is the same value as SA_OPCODE_DECRYPT.
167	 * it's the DIR_(IN|OUT)BOUND that matters
168	 */
169	sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT;
170
171	return 0;
172}
173
174int crypto4xx_setkey_aes_cbc(struct crypto_skcipher *cipher,
175			     const u8 *key, unsigned int keylen)
176{
177	return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
178				    CRYPTO_FEEDBACK_MODE_NO_FB);
179}
180
181int crypto4xx_setkey_aes_ecb(struct crypto_skcipher *cipher,
182			     const u8 *key, unsigned int keylen)
183{
184	return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_ECB,
185				    CRYPTO_FEEDBACK_MODE_NO_FB);
186}
187
188int crypto4xx_setkey_rfc3686(struct crypto_skcipher *cipher,
189			     const u8 *key, unsigned int keylen)
190{
191	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
192	int rc;
193
194	rc = crypto4xx_setkey_aes(cipher, key, keylen - CTR_RFC3686_NONCE_SIZE,
195		CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
196	if (rc)
197		return rc;
198
199	ctx->iv_nonce = cpu_to_le32p((u32 *)&key[keylen -
200						 CTR_RFC3686_NONCE_SIZE]);
201
202	return 0;
203}
204
205int crypto4xx_rfc3686_encrypt(struct skcipher_request *req)
206{
207	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
208	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
209	__le32 iv[AES_IV_SIZE / 4] = {
210		ctx->iv_nonce,
211		cpu_to_le32p((u32 *) req->iv),
212		cpu_to_le32p((u32 *) (req->iv + 4)),
213		cpu_to_le32(1) };
214
215	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
216				  req->cryptlen, iv, AES_IV_SIZE,
217				  ctx->sa_out, ctx->sa_len, 0, NULL);
218}
219
220int crypto4xx_rfc3686_decrypt(struct skcipher_request *req)
221{
222	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
223	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
224	__le32 iv[AES_IV_SIZE / 4] = {
225		ctx->iv_nonce,
226		cpu_to_le32p((u32 *) req->iv),
227		cpu_to_le32p((u32 *) (req->iv + 4)),
228		cpu_to_le32(1) };
229
230	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
231				  req->cryptlen, iv, AES_IV_SIZE,
232				  ctx->sa_out, ctx->sa_len, 0, NULL);
233}
234
235static int
236crypto4xx_ctr_crypt(struct skcipher_request *req, bool encrypt)
237{
238	struct crypto_skcipher *cipher = crypto_skcipher_reqtfm(req);
239	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
240	size_t iv_len = crypto_skcipher_ivsize(cipher);
241	unsigned int counter = be32_to_cpup((__be32 *)(req->iv + iv_len - 4));
242	unsigned int nblks = ALIGN(req->cryptlen, AES_BLOCK_SIZE) /
243			AES_BLOCK_SIZE;
244
245	/*
246	 * The hardware uses only the last 32-bits as the counter while the
247	 * kernel tests (aes_ctr_enc_tv_template[4] for example) expect that
248	 * the whole IV is a counter.  So fallback if the counter is going to
249	 * overlow.
250	 */
251	if (counter + nblks < counter) {
252		SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, ctx->sw_cipher.cipher);
253		int ret;
254
255		skcipher_request_set_sync_tfm(subreq, ctx->sw_cipher.cipher);
256		skcipher_request_set_callback(subreq, req->base.flags,
257			NULL, NULL);
258		skcipher_request_set_crypt(subreq, req->src, req->dst,
259			req->cryptlen, req->iv);
260		ret = encrypt ? crypto_skcipher_encrypt(subreq)
261			: crypto_skcipher_decrypt(subreq);
262		skcipher_request_zero(subreq);
263		return ret;
264	}
265
266	return encrypt ? crypto4xx_encrypt_iv_stream(req)
267		       : crypto4xx_decrypt_iv_stream(req);
268}
269
270static int crypto4xx_sk_setup_fallback(struct crypto4xx_ctx *ctx,
271				       struct crypto_skcipher *cipher,
272				       const u8 *key,
273				       unsigned int keylen)
274{
275	crypto_sync_skcipher_clear_flags(ctx->sw_cipher.cipher,
276				    CRYPTO_TFM_REQ_MASK);
277	crypto_sync_skcipher_set_flags(ctx->sw_cipher.cipher,
278		crypto_skcipher_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
279	return crypto_sync_skcipher_setkey(ctx->sw_cipher.cipher, key, keylen);
280}
281
282int crypto4xx_setkey_aes_ctr(struct crypto_skcipher *cipher,
283			     const u8 *key, unsigned int keylen)
284{
285	struct crypto4xx_ctx *ctx = crypto_skcipher_ctx(cipher);
286	int rc;
287
288	rc = crypto4xx_sk_setup_fallback(ctx, cipher, key, keylen);
289	if (rc)
290		return rc;
291
292	return crypto4xx_setkey_aes(cipher, key, keylen,
293		CRYPTO_MODE_CTR, CRYPTO_FEEDBACK_MODE_NO_FB);
294}
295
296int crypto4xx_encrypt_ctr(struct skcipher_request *req)
297{
298	return crypto4xx_ctr_crypt(req, true);
299}
300
301int crypto4xx_decrypt_ctr(struct skcipher_request *req)
302{
303	return crypto4xx_ctr_crypt(req, false);
304}
305
306static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
307						unsigned int len,
308						bool is_ccm, bool decrypt)
309{
310	struct crypto_aead *aead = crypto_aead_reqtfm(req);
311
312	/* authsize has to be a multiple of 4 */
313	if (aead->authsize & 3)
314		return true;
315
316	/*
317	 * hardware does not handle cases where plaintext
318	 * is less than a block.
319	 */
320	if (len < AES_BLOCK_SIZE)
321		return true;
322
323	/* assoc len needs to be a multiple of 4 and <= 1020 */
324	if (req->assoclen & 0x3 || req->assoclen > 1020)
325		return true;
326
327	/* CCM supports only counter field length of 2 and 4 bytes */
328	if (is_ccm && !(req->iv[0] == 1 || req->iv[0] == 3))
329		return true;
330
331	return false;
332}
333
334static int crypto4xx_aead_fallback(struct aead_request *req,
335	struct crypto4xx_ctx *ctx, bool do_decrypt)
336{
337	struct aead_request *subreq = aead_request_ctx(req);
338
339	aead_request_set_tfm(subreq, ctx->sw_cipher.aead);
340	aead_request_set_callback(subreq, req->base.flags,
341				  req->base.complete, req->base.data);
342	aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
343			       req->iv);
344	aead_request_set_ad(subreq, req->assoclen);
345	return do_decrypt ? crypto_aead_decrypt(subreq) :
346			    crypto_aead_encrypt(subreq);
347}
348
349static int crypto4xx_aead_setup_fallback(struct crypto4xx_ctx *ctx,
350					 struct crypto_aead *cipher,
351					 const u8 *key,
352					 unsigned int keylen)
353{
354	crypto_aead_clear_flags(ctx->sw_cipher.aead, CRYPTO_TFM_REQ_MASK);
355	crypto_aead_set_flags(ctx->sw_cipher.aead,
356		crypto_aead_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
357	return crypto_aead_setkey(ctx->sw_cipher.aead, key, keylen);
358}
359
360/*
361 * AES-CCM Functions
362 */
363
364int crypto4xx_setkey_aes_ccm(struct crypto_aead *cipher, const u8 *key,
365			     unsigned int keylen)
366{
367	struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
368	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
369	struct dynamic_sa_ctl *sa;
370	int rc = 0;
371
372	rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
373	if (rc)
374		return rc;
375
376	if (ctx->sa_in || ctx->sa_out)
377		crypto4xx_free_sa(ctx);
378
379	rc = crypto4xx_alloc_sa(ctx, SA_AES128_CCM_LEN + (keylen - 16) / 4);
380	if (rc)
381		return rc;
382
383	/* Setup SA */
384	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
385	sa->sa_contents.w = SA_AES_CCM_CONTENTS | (keylen << 2);
386
387	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
388				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
389				 SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
390				 SA_CIPHER_ALG_AES,
391				 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
392				 SA_OPCODE_HASH_DECRYPT, DIR_INBOUND);
393
394	set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
395				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
396				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
397				 SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
398				 SA_NOT_COPY_HDR);
399
400	sa->sa_command_1.bf.key_len = keylen >> 3;
401
402	crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa), key, keylen);
403
404	memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
405	sa = (struct dynamic_sa_ctl *) ctx->sa_out;
406
407	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
408				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
409				 SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
410				 SA_CIPHER_ALG_AES,
411				 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
412				 SA_OPCODE_ENCRYPT_HASH, DIR_OUTBOUND);
413
414	set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
415				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
416				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
417				 SA_COPY_PAD, SA_COPY_PAYLOAD,
418				 SA_NOT_COPY_HDR);
419
420	sa->sa_command_1.bf.key_len = keylen >> 3;
421	return 0;
422}
423
424static int crypto4xx_crypt_aes_ccm(struct aead_request *req, bool decrypt)
425{
426	struct crypto4xx_ctx *ctx  = crypto_tfm_ctx(req->base.tfm);
427	struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
428	struct crypto_aead *aead = crypto_aead_reqtfm(req);
429	__le32 iv[4];
430	u32 tmp_sa[SA_AES128_CCM_LEN + 4];
431	struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
432	unsigned int len = req->cryptlen;
433
434	if (decrypt)
435		len -= crypto_aead_authsize(aead);
436
437	if (crypto4xx_aead_need_fallback(req, len, true, decrypt))
438		return crypto4xx_aead_fallback(req, ctx, decrypt);
439
440	memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, ctx->sa_len * 4);
441	sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;
442
443	if (req->iv[0] == 1) {
444		/* CRYPTO_MODE_AES_ICM */
445		sa->sa_command_1.bf.crypto_mode9_8 = 1;
446	}
447
448	iv[3] = cpu_to_le32(0);
449	crypto4xx_memcpy_to_le32(iv, req->iv, 16 - (req->iv[0] + 1));
450
451	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
452				  len, iv, sizeof(iv),
453				  sa, ctx->sa_len, req->assoclen, rctx->dst);
454}
455
456int crypto4xx_encrypt_aes_ccm(struct aead_request *req)
457{
458	return crypto4xx_crypt_aes_ccm(req, false);
459}
460
461int crypto4xx_decrypt_aes_ccm(struct aead_request *req)
462{
463	return crypto4xx_crypt_aes_ccm(req, true);
464}
465
466int crypto4xx_setauthsize_aead(struct crypto_aead *cipher,
467			       unsigned int authsize)
468{
469	struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
470	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
471
472	return crypto_aead_setauthsize(ctx->sw_cipher.aead, authsize);
473}
474
475/*
476 * AES-GCM Functions
477 */
478
479static int crypto4xx_aes_gcm_validate_keylen(unsigned int keylen)
480{
481	switch (keylen) {
482	case 16:
483	case 24:
484	case 32:
485		return 0;
486	default:
487		return -EINVAL;
488	}
489}
490
491static int crypto4xx_compute_gcm_hash_key_sw(__le32 *hash_start, const u8 *key,
492					     unsigned int keylen)
493{
494	struct crypto_aes_ctx ctx;
495	uint8_t src[16] = { 0 };
496	int rc;
497
498	rc = aes_expandkey(&ctx, key, keylen);
499	if (rc) {
500		pr_err("aes_expandkey() failed: %d\n", rc);
501		return rc;
502	}
503
504	aes_encrypt(&ctx, src, src);
505	crypto4xx_memcpy_to_le32(hash_start, src, 16);
506	memzero_explicit(&ctx, sizeof(ctx));
507	return 0;
508}
509
510int crypto4xx_setkey_aes_gcm(struct crypto_aead *cipher,
511			     const u8 *key, unsigned int keylen)
512{
513	struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
514	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
515	struct dynamic_sa_ctl *sa;
516	int    rc = 0;
517
518	if (crypto4xx_aes_gcm_validate_keylen(keylen) != 0)
519		return -EINVAL;
520
521	rc = crypto4xx_aead_setup_fallback(ctx, cipher, key, keylen);
522	if (rc)
523		return rc;
524
525	if (ctx->sa_in || ctx->sa_out)
526		crypto4xx_free_sa(ctx);
527
528	rc = crypto4xx_alloc_sa(ctx, SA_AES128_GCM_LEN + (keylen - 16) / 4);
529	if (rc)
530		return rc;
531
532	sa  = (struct dynamic_sa_ctl *) ctx->sa_in;
533
534	sa->sa_contents.w = SA_AES_GCM_CONTENTS | (keylen << 2);
535	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
536				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
537				 SA_NO_HEADER_PROC, SA_HASH_ALG_GHASH,
538				 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
539				 SA_OP_GROUP_BASIC, SA_OPCODE_HASH_DECRYPT,
540				 DIR_INBOUND);
541	set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
542				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
543				 SA_SEQ_MASK_ON, SA_MC_DISABLE,
544				 SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
545				 SA_NOT_COPY_HDR);
546
547	sa->sa_command_1.bf.key_len = keylen >> 3;
548
549	crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa),
550				 key, keylen);
551
552	rc = crypto4xx_compute_gcm_hash_key_sw(get_dynamic_sa_inner_digest(sa),
553		key, keylen);
554	if (rc) {
555		pr_err("GCM hash key setting failed = %d\n", rc);
556		goto err;
557	}
558
559	memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
560	sa = (struct dynamic_sa_ctl *) ctx->sa_out;
561	sa->sa_command_0.bf.dir = DIR_OUTBOUND;
562	sa->sa_command_0.bf.opcode = SA_OPCODE_ENCRYPT_HASH;
563
564	return 0;
565err:
566	crypto4xx_free_sa(ctx);
567	return rc;
568}
569
570static inline int crypto4xx_crypt_aes_gcm(struct aead_request *req,
571					  bool decrypt)
572{
573	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
574	struct crypto4xx_aead_reqctx *rctx = aead_request_ctx(req);
575	__le32 iv[4];
576	unsigned int len = req->cryptlen;
577
578	if (decrypt)
579		len -= crypto_aead_authsize(crypto_aead_reqtfm(req));
580
581	if (crypto4xx_aead_need_fallback(req, len, false, decrypt))
582		return crypto4xx_aead_fallback(req, ctx, decrypt);
583
584	crypto4xx_memcpy_to_le32(iv, req->iv, GCM_AES_IV_SIZE);
585	iv[3] = cpu_to_le32(1);
586
587	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
588				  len, iv, sizeof(iv),
589				  decrypt ? ctx->sa_in : ctx->sa_out,
590				  ctx->sa_len, req->assoclen, rctx->dst);
591}
592
593int crypto4xx_encrypt_aes_gcm(struct aead_request *req)
594{
595	return crypto4xx_crypt_aes_gcm(req, false);
596}
597
598int crypto4xx_decrypt_aes_gcm(struct aead_request *req)
599{
600	return crypto4xx_crypt_aes_gcm(req, true);
601}