a33243c17b00d0c3929fdd49693edc0524e06f8c
[linux-2.6.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 void 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
55 void 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
72 int 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
86 int 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  */
103 static 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
169 int 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  */
179 static 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
236 int 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
253 int 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
267 int crypto4xx_hash_final(struct ahash_request *req)
268 {
269         return 0;
270 }
271
272 int 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  */
288 int 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