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
set_dynamic_sa_command_0(struct dynamic_sa_ctl * sa,u32 save_h,u32 save_iv,u32 ld_h,u32 ld_iv,u32 hdr_proc,u32 h,u32 c,u32 pad_type,u32 op_grp,u32 op,u32 dir)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
set_dynamic_sa_command_1(struct dynamic_sa_ctl * sa,u32 cm,u32 hmac_mc,u32 cfb,u32 esn,u32 sn_mask,u32 mute,u32 cp_pad,u32 cp_pay,u32 cp_hdr)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
crypto4xx_encrypt(struct ablkcipher_request * req)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
crypto4xx_decrypt(struct ablkcipher_request * req)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 */
crypto4xx_setkey_aes(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int keylen,unsigned char cm,u8 fb)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
crypto4xx_setkey_aes_cbc(struct crypto_ablkcipher * cipher,const u8 * key,unsigned int keylen)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 */
crypto4xx_hash_alg_init(struct crypto_tfm * tfm,unsigned int sa_len,unsigned char ha,unsigned char hm)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
crypto4xx_hash_init(struct ahash_request * req)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
crypto4xx_hash_update(struct ahash_request * req)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
crypto4xx_hash_final(struct ahash_request * req)267 int crypto4xx_hash_final(struct ahash_request *req)
268 {
269 return 0;
270 }
271
crypto4xx_hash_digest(struct ahash_request * req)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 */
crypto4xx_sha1_alg_init(struct crypto_tfm * tfm)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
295