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/drivers/crypto/amcc/crypto4xx_alg.c

https://bitbucket.org/ndreys/linux-sunxi
C | 294 lines | 224 code | 39 blank | 31 comment | 17 complexity | 16bff10a038992060b4c91380bdec815 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/**
  2 * AMCC SoC PPC4xx Crypto Driver
  3 *
  4 * Copyright (c) 2008 Applied Micro Circuits Corporation.
  5 * All rights reserved. James Hsiao <jhsiao@amcc.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License as published by
  9 * the Free Software Foundation; either version 2 of the License, or
 10 * (at your option) any later version.
 11 *
 12 * This program is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 15 * GNU General Public License for more details.
 16 *
 17 * This file implements the Linux crypto algorithms.
 18 */
 19
 20#include <linux/kernel.h>
 21#include <linux/interrupt.h>
 22#include <linux/spinlock_types.h>
 23#include <linux/scatterlist.h>
 24#include <linux/crypto.h>
 25#include <linux/hash.h>
 26#include <crypto/internal/hash.h>
 27#include <linux/dma-mapping.h>
 28#include <crypto/algapi.h>
 29#include <crypto/aes.h>
 30#include <crypto/sha.h>
 31#include "crypto4xx_reg_def.h"
 32#include "crypto4xx_sa.h"
 33#include "crypto4xx_core.h"
 34
 35void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
 36			      u32 save_iv, u32 ld_h, u32 ld_iv, u32 hdr_proc,
 37			      u32 h, u32 c, u32 pad_type, u32 op_grp, u32 op,
 38			      u32 dir)
 39{
 40	sa->sa_command_0.w = 0;
 41	sa->sa_command_0.bf.save_hash_state = save_h;
 42	sa->sa_command_0.bf.save_iv = save_iv;
 43	sa->sa_command_0.bf.load_hash_state = ld_h;
 44	sa->sa_command_0.bf.load_iv = ld_iv;
 45	sa->sa_command_0.bf.hdr_proc = hdr_proc;
 46	sa->sa_command_0.bf.hash_alg = h;
 47	sa->sa_command_0.bf.cipher_alg = c;
 48	sa->sa_command_0.bf.pad_type = pad_type & 3;
 49	sa->sa_command_0.bf.extend_pad = pad_type >> 2;
 50	sa->sa_command_0.bf.op_group = op_grp;
 51	sa->sa_command_0.bf.opcode = op;
 52	sa->sa_command_0.bf.dir = dir;
 53}
 54
 55void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm, u32 hmac_mc,
 56			      u32 cfb, u32 esn, u32 sn_mask, u32 mute,
 57			      u32 cp_pad, u32 cp_pay, u32 cp_hdr)
 58{
 59	sa->sa_command_1.w = 0;
 60	sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
 61	sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
 62	sa->sa_command_1.bf.feedback_mode = cfb,
 63	sa->sa_command_1.bf.sa_rev = 1;
 64	sa->sa_command_1.bf.extended_seq_num = esn;
 65	sa->sa_command_1.bf.seq_num_mask = sn_mask;
 66	sa->sa_command_1.bf.mutable_bit_proc = mute;
 67	sa->sa_command_1.bf.copy_pad = cp_pad;
 68	sa->sa_command_1.bf.copy_payload = cp_pay;
 69	sa->sa_command_1.bf.copy_hdr = cp_hdr;
 70}
 71
 72int crypto4xx_encrypt(struct ablkcipher_request *req)
 73{
 74	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 75
 76	ctx->direction = DIR_OUTBOUND;
 77	ctx->hash_final = 0;
 78	ctx->is_hash = 0;
 79	ctx->pd_ctl = 0x1;
 80
 81	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 82				  req->nbytes, req->info,
 83				  get_dynamic_sa_iv_size(ctx));
 84}
 85
 86int crypto4xx_decrypt(struct ablkcipher_request *req)
 87{
 88	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
 89
 90	ctx->direction = DIR_INBOUND;
 91	ctx->hash_final = 0;
 92	ctx->is_hash = 0;
 93	ctx->pd_ctl = 1;
 94
 95	return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 96				  req->nbytes, req->info,
 97				  get_dynamic_sa_iv_size(ctx));
 98}
 99
100/**
101 * AES Functions
102 */
103static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher,
104				const u8 *key,
105				unsigned int keylen,
106				unsigned char cm,
107				u8 fb)
108{
109	struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
110	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
111	struct dynamic_sa_ctl *sa;
112	int    rc;
113
114	if (keylen != AES_KEYSIZE_256 &&
115		keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
116		crypto_ablkcipher_set_flags(cipher,
117				CRYPTO_TFM_RES_BAD_KEY_LEN);
118		return -EINVAL;
119	}
120
121	/* Create SA */
122	if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
123		crypto4xx_free_sa(ctx);
124
125	rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
126	if (rc)
127		return rc;
128
129	if (ctx->state_record_dma_addr == 0) {
130		rc = crypto4xx_alloc_state_record(ctx);
131		if (rc) {
132			crypto4xx_free_sa(ctx);
133			return rc;
134		}
135	}
136	/* Setup SA */
137	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
138	ctx->hash_final = 0;
139
140	set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
141				 SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
142				 SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
143				 SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
144				 SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
145				 DIR_INBOUND);
146
147	set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
148				 fb, SA_EXTENDED_SN_OFF,
149				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
150				 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
151				 SA_NOT_COPY_HDR);
152	crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx),
153			    key, keylen);
154	sa->sa_contents = SA_AES_CONTENTS | (keylen << 2);
155	sa->sa_command_1.bf.key_len = keylen >> 3;
156	ctx->is_hash = 0;
157	ctx->direction = DIR_INBOUND;
158	memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx),
159			(void *)&ctx->state_record_dma_addr, 4);
160	ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
161
162	memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
163	sa = (struct dynamic_sa_ctl *) ctx->sa_out;
164	sa->sa_command_0.bf.dir = DIR_OUTBOUND;
165
166	return 0;
167}
168
169int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher,
170			     const u8 *key, unsigned int keylen)
171{
172	return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
173				    CRYPTO_FEEDBACK_MODE_NO_FB);
174}
175
176/**
177 * HASH SHA1 Functions
178 */
179static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
180				   unsigned int sa_len,
181				   unsigned char ha,
182				   unsigned char hm)
183{
184	struct crypto_alg *alg = tfm->__crt_alg;
185	struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg);
186	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
187	struct dynamic_sa_ctl *sa;
188	struct dynamic_sa_hash160 *sa_in;
189	int rc;
190
191	ctx->dev   = my_alg->dev;
192	ctx->is_hash = 1;
193	ctx->hash_final = 0;
194
195	/* Create SA */
196	if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
197		crypto4xx_free_sa(ctx);
198
199	rc = crypto4xx_alloc_sa(ctx, sa_len);
200	if (rc)
201		return rc;
202
203	if (ctx->state_record_dma_addr == 0) {
204		crypto4xx_alloc_state_record(ctx);
205		if (!ctx->state_record_dma_addr) {
206			crypto4xx_free_sa(ctx);
207			return -ENOMEM;
208		}
209	}
210
211	crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
212				 sizeof(struct crypto4xx_ctx));
213	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
214	set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
215				 SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
216				 SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
217				 SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
218				 SA_OPCODE_HASH, DIR_INBOUND);
219	set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH,
220				 CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
221				 SA_SEQ_MASK_OFF, SA_MC_ENABLE,
222				 SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
223				 SA_NOT_COPY_HDR);
224	ctx->direction = DIR_INBOUND;
225	sa->sa_contents = SA_HASH160_CONTENTS;
226	sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in;
227	/* Need to zero hash digest in SA */
228	memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest));
229	memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest));
230	sa_in->state_ptr = ctx->state_record_dma_addr;
231	ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
232
233	return 0;
234}
235
236int crypto4xx_hash_init(struct ahash_request *req)
237{
238	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
239	int ds;
240	struct dynamic_sa_ctl *sa;
241
242	sa = (struct dynamic_sa_ctl *) ctx->sa_in;
243	ds = crypto_ahash_digestsize(
244			__crypto_ahash_cast(req->base.tfm));
245	sa->sa_command_0.bf.digest_len = ds >> 2;
246	sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
247	ctx->is_hash = 1;
248	ctx->direction = DIR_INBOUND;
249
250	return 0;
251}
252
253int crypto4xx_hash_update(struct ahash_request *req)
254{
255	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
256
257	ctx->is_hash = 1;
258	ctx->hash_final = 0;
259	ctx->pd_ctl = 0x11;
260	ctx->direction = DIR_INBOUND;
261
262	return crypto4xx_build_pd(&req->base, ctx, req->src,
263				  (struct scatterlist *) req->result,
264				  req->nbytes, NULL, 0);
265}
266
267int crypto4xx_hash_final(struct ahash_request *req)
268{
269	return 0;
270}
271
272int crypto4xx_hash_digest(struct ahash_request *req)
273{
274	struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
275
276	ctx->hash_final = 1;
277	ctx->pd_ctl = 0x11;
278	ctx->direction = DIR_INBOUND;
279
280	return crypto4xx_build_pd(&req->base, ctx, req->src,
281				  (struct scatterlist *) req->result,
282				  req->nbytes, NULL, 0);
283}
284
285/**
286 * SHA1 Algorithm
287 */
288int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
289{
290	return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
291				       SA_HASH_MODE_HASH);
292}
293
294