GNU Linux-libre 4.4.300-gnu1
[releases.git] / drivers / crypto / amcc / crypto4xx_alg.c
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
35 static void set_dynamic_sa_command_0(struct dynamic_sa_ctl *sa, u32 save_h,
36                                      u32 save_iv, u32 ld_h, u32 ld_iv,
37                                      u32 hdr_proc, u32 h, u32 c, u32 pad_type,
38                                      u32 op_grp, u32 op, 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
55 static void set_dynamic_sa_command_1(struct dynamic_sa_ctl *sa, u32 cm,
56                                      u32 hmac_mc, u32 cfb, u32 esn,
57                                      u32 sn_mask, u32 mute, u32 cp_pad,
58                                      u32 cp_pay, u32 cp_hdr)
59 {
60         sa->sa_command_1.w = 0;
61         sa->sa_command_1.bf.crypto_mode31 = (cm & 4) >> 2;
62         sa->sa_command_1.bf.crypto_mode9_8 = cm & 3;
63         sa->sa_command_1.bf.feedback_mode = cfb,
64         sa->sa_command_1.bf.sa_rev = 1;
65         sa->sa_command_1.bf.extended_seq_num = esn;
66         sa->sa_command_1.bf.seq_num_mask = sn_mask;
67         sa->sa_command_1.bf.mutable_bit_proc = mute;
68         sa->sa_command_1.bf.copy_pad = cp_pad;
69         sa->sa_command_1.bf.copy_payload = cp_pay;
70         sa->sa_command_1.bf.copy_hdr = cp_hdr;
71 }
72
73 int crypto4xx_encrypt(struct ablkcipher_request *req)
74 {
75         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
76
77         ctx->direction = DIR_OUTBOUND;
78         ctx->hash_final = 0;
79         ctx->is_hash = 0;
80         ctx->pd_ctl = 0x1;
81
82         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
83                                   req->nbytes, req->info,
84                                   get_dynamic_sa_iv_size(ctx));
85 }
86
87 int crypto4xx_decrypt(struct ablkcipher_request *req)
88 {
89         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
90
91         ctx->direction = DIR_INBOUND;
92         ctx->hash_final = 0;
93         ctx->is_hash = 0;
94         ctx->pd_ctl = 1;
95
96         return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
97                                   req->nbytes, req->info,
98                                   get_dynamic_sa_iv_size(ctx));
99 }
100
101 /**
102  * AES Functions
103  */
104 static int crypto4xx_setkey_aes(struct crypto_ablkcipher *cipher,
105                                 const u8 *key,
106                                 unsigned int keylen,
107                                 unsigned char cm,
108                                 u8 fb)
109 {
110         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
111         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
112         struct dynamic_sa_ctl *sa;
113         int    rc;
114
115         if (keylen != AES_KEYSIZE_256 &&
116                 keylen != AES_KEYSIZE_192 && keylen != AES_KEYSIZE_128) {
117                 crypto_ablkcipher_set_flags(cipher,
118                                 CRYPTO_TFM_RES_BAD_KEY_LEN);
119                 return -EINVAL;
120         }
121
122         /* Create SA */
123         if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
124                 crypto4xx_free_sa(ctx);
125
126         rc = crypto4xx_alloc_sa(ctx, SA_AES128_LEN + (keylen-16) / 4);
127         if (rc)
128                 return rc;
129
130         if (ctx->state_record_dma_addr == 0) {
131                 rc = crypto4xx_alloc_state_record(ctx);
132                 if (rc) {
133                         crypto4xx_free_sa(ctx);
134                         return rc;
135                 }
136         }
137         /* Setup SA */
138         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
139         ctx->hash_final = 0;
140
141         set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
142                                  SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
143                                  SA_NO_HEADER_PROC, SA_HASH_ALG_NULL,
144                                  SA_CIPHER_ALG_AES, SA_PAD_TYPE_ZERO,
145                                  SA_OP_GROUP_BASIC, SA_OPCODE_DECRYPT,
146                                  DIR_INBOUND);
147
148         set_dynamic_sa_command_1(sa, cm, SA_HASH_MODE_HASH,
149                                  fb, SA_EXTENDED_SN_OFF,
150                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
151                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
152                                  SA_NOT_COPY_HDR);
153         crypto4xx_memcpy_le(ctx->sa_in + get_dynamic_sa_offset_key_field(ctx),
154                             key, keylen);
155         sa->sa_contents = SA_AES_CONTENTS | (keylen << 2);
156         sa->sa_command_1.bf.key_len = keylen >> 3;
157         ctx->is_hash = 0;
158         ctx->direction = DIR_INBOUND;
159         memcpy(ctx->sa_in + get_dynamic_sa_offset_state_ptr_field(ctx),
160                         (void *)&ctx->state_record_dma_addr, 4);
161         ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
162
163         memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
164         sa = (struct dynamic_sa_ctl *) ctx->sa_out;
165         sa->sa_command_0.bf.dir = DIR_OUTBOUND;
166
167         return 0;
168 }
169
170 int crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher *cipher,
171                              const u8 *key, unsigned int keylen)
172 {
173         return crypto4xx_setkey_aes(cipher, key, keylen, CRYPTO_MODE_CBC,
174                                     CRYPTO_FEEDBACK_MODE_NO_FB);
175 }
176
177 /**
178  * HASH SHA1 Functions
179  */
180 static int crypto4xx_hash_alg_init(struct crypto_tfm *tfm,
181                                    unsigned int sa_len,
182                                    unsigned char ha,
183                                    unsigned char hm)
184 {
185         struct crypto_alg *alg = tfm->__crt_alg;
186         struct crypto4xx_alg *my_alg = crypto_alg_to_crypto4xx_alg(alg);
187         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
188         struct dynamic_sa_ctl *sa;
189         struct dynamic_sa_hash160 *sa_in;
190         int rc;
191
192         ctx->dev   = my_alg->dev;
193         ctx->is_hash = 1;
194         ctx->hash_final = 0;
195
196         /* Create SA */
197         if (ctx->sa_in_dma_addr || ctx->sa_out_dma_addr)
198                 crypto4xx_free_sa(ctx);
199
200         rc = crypto4xx_alloc_sa(ctx, sa_len);
201         if (rc)
202                 return rc;
203
204         if (ctx->state_record_dma_addr == 0) {
205                 crypto4xx_alloc_state_record(ctx);
206                 if (!ctx->state_record_dma_addr) {
207                         crypto4xx_free_sa(ctx);
208                         return -ENOMEM;
209                 }
210         }
211
212         crypto_ahash_set_reqsize(__crypto_ahash_cast(tfm),
213                                  sizeof(struct crypto4xx_ctx));
214         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
215         set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
216                                  SA_NOT_LOAD_HASH, SA_LOAD_IV_FROM_SA,
217                                  SA_NO_HEADER_PROC, ha, SA_CIPHER_ALG_NULL,
218                                  SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
219                                  SA_OPCODE_HASH, DIR_INBOUND);
220         set_dynamic_sa_command_1(sa, 0, SA_HASH_MODE_HASH,
221                                  CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
222                                  SA_SEQ_MASK_OFF, SA_MC_ENABLE,
223                                  SA_NOT_COPY_PAD, SA_NOT_COPY_PAYLOAD,
224                                  SA_NOT_COPY_HDR);
225         ctx->direction = DIR_INBOUND;
226         sa->sa_contents = SA_HASH160_CONTENTS;
227         sa_in = (struct dynamic_sa_hash160 *) ctx->sa_in;
228         /* Need to zero hash digest in SA */
229         memset(sa_in->inner_digest, 0, sizeof(sa_in->inner_digest));
230         memset(sa_in->outer_digest, 0, sizeof(sa_in->outer_digest));
231         sa_in->state_ptr = ctx->state_record_dma_addr;
232         ctx->offset_to_sr_ptr = get_dynamic_sa_offset_state_ptr_field(ctx);
233
234         return 0;
235 }
236
237 int crypto4xx_hash_init(struct ahash_request *req)
238 {
239         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
240         int ds;
241         struct dynamic_sa_ctl *sa;
242
243         sa = (struct dynamic_sa_ctl *) ctx->sa_in;
244         ds = crypto_ahash_digestsize(
245                         __crypto_ahash_cast(req->base.tfm));
246         sa->sa_command_0.bf.digest_len = ds >> 2;
247         sa->sa_command_0.bf.load_hash_state = SA_LOAD_HASH_FROM_SA;
248         ctx->is_hash = 1;
249         ctx->direction = DIR_INBOUND;
250
251         return 0;
252 }
253
254 int crypto4xx_hash_update(struct ahash_request *req)
255 {
256         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
257
258         ctx->is_hash = 1;
259         ctx->hash_final = 0;
260         ctx->pd_ctl = 0x11;
261         ctx->direction = DIR_INBOUND;
262
263         return crypto4xx_build_pd(&req->base, ctx, req->src,
264                                   (struct scatterlist *) req->result,
265                                   req->nbytes, NULL, 0);
266 }
267
268 int crypto4xx_hash_final(struct ahash_request *req)
269 {
270         return 0;
271 }
272
273 int crypto4xx_hash_digest(struct ahash_request *req)
274 {
275         struct crypto4xx_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
276
277         ctx->hash_final = 1;
278         ctx->pd_ctl = 0x11;
279         ctx->direction = DIR_INBOUND;
280
281         return crypto4xx_build_pd(&req->base, ctx, req->src,
282                                   (struct scatterlist *) req->result,
283                                   req->nbytes, NULL, 0);
284 }
285
286 /**
287  * SHA1 Algorithm
288  */
289 int crypto4xx_sha1_alg_init(struct crypto_tfm *tfm)
290 {
291         return crypto4xx_hash_alg_init(tfm, SA_HASH160_LEN, SA_HASH_ALG_SHA1,
292                                        SA_HASH_MODE_HASH);
293 }
294
295