1 /**
2 * AES CTR routines supporting the Power 7+ Nest Accelerators driver
3 *
4 * Copyright (C) 2011-2012 International Business Machines Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 only.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 *
19 * Author: Kent Yoder <yoder1@us.ibm.com>
20 */
21
22 #include <crypto/aes.h>
23 #include <crypto/ctr.h>
24 #include <crypto/algapi.h>
25 #include <linux/module.h>
26 #include <linux/types.h>
27 #include <linux/crypto.h>
28 #include <asm/vio.h>
29
30 #include "nx_csbcpb.h"
31 #include "nx.h"
32
33
ctr_aes_nx_set_key(struct crypto_tfm * tfm,const u8 * in_key,unsigned int key_len)34 static int ctr_aes_nx_set_key(struct crypto_tfm *tfm,
35 const u8 *in_key,
36 unsigned int key_len)
37 {
38 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
39 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
40
41 nx_ctx_init(nx_ctx, HCOP_FC_AES);
42
43 switch (key_len) {
44 case AES_KEYSIZE_128:
45 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
46 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
47 break;
48 case AES_KEYSIZE_192:
49 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
50 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
51 break;
52 case AES_KEYSIZE_256:
53 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
54 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
55 break;
56 default:
57 return -EINVAL;
58 }
59
60 csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR;
61 memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len);
62
63 return 0;
64 }
65
ctr3686_aes_nx_set_key(struct crypto_tfm * tfm,const u8 * in_key,unsigned int key_len)66 static int ctr3686_aes_nx_set_key(struct crypto_tfm *tfm,
67 const u8 *in_key,
68 unsigned int key_len)
69 {
70 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
71
72 if (key_len < CTR_RFC3686_NONCE_SIZE)
73 return -EINVAL;
74
75 memcpy(nx_ctx->priv.ctr.iv,
76 in_key + key_len - CTR_RFC3686_NONCE_SIZE,
77 CTR_RFC3686_NONCE_SIZE);
78
79 key_len -= CTR_RFC3686_NONCE_SIZE;
80
81 return ctr_aes_nx_set_key(tfm, in_key, key_len);
82 }
83
ctr_aes_nx_crypt(struct blkcipher_desc * desc,struct scatterlist * dst,struct scatterlist * src,unsigned int nbytes)84 static int ctr_aes_nx_crypt(struct blkcipher_desc *desc,
85 struct scatterlist *dst,
86 struct scatterlist *src,
87 unsigned int nbytes)
88 {
89 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
90 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
91 int rc;
92
93 if (nbytes > nx_ctx->ap->databytelen)
94 return -EINVAL;
95
96 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes,
97 csbcpb->cpb.aes_ctr.iv);
98 if (rc)
99 goto out;
100
101 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
102 rc = -EINVAL;
103 goto out;
104 }
105
106 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
107 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
108 if (rc)
109 goto out;
110
111 atomic_inc(&(nx_ctx->stats->aes_ops));
112 atomic64_add(csbcpb->csb.processed_byte_count,
113 &(nx_ctx->stats->aes_bytes));
114 out:
115 return rc;
116 }
117
ctr3686_aes_nx_crypt(struct blkcipher_desc * desc,struct scatterlist * dst,struct scatterlist * src,unsigned int nbytes)118 static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc,
119 struct scatterlist *dst,
120 struct scatterlist *src,
121 unsigned int nbytes)
122 {
123 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
124 u8 *iv = nx_ctx->priv.ctr.iv;
125
126 memcpy(iv + CTR_RFC3686_NONCE_SIZE,
127 desc->info, CTR_RFC3686_IV_SIZE);
128 iv[15] = 1;
129
130 desc->info = nx_ctx->priv.ctr.iv;
131
132 return ctr_aes_nx_crypt(desc, dst, src, nbytes);
133 }
134
135 struct crypto_alg nx_ctr_aes_alg = {
136 .cra_name = "ctr(aes)",
137 .cra_driver_name = "ctr-aes-nx",
138 .cra_priority = 300,
139 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
140 .cra_blocksize = 1,
141 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
142 .cra_type = &crypto_blkcipher_type,
143 .cra_module = THIS_MODULE,
144 .cra_init = nx_crypto_ctx_aes_ctr_init,
145 .cra_exit = nx_crypto_ctx_exit,
146 .cra_blkcipher = {
147 .min_keysize = AES_MIN_KEY_SIZE,
148 .max_keysize = AES_MAX_KEY_SIZE,
149 .ivsize = AES_BLOCK_SIZE,
150 .setkey = ctr_aes_nx_set_key,
151 .encrypt = ctr_aes_nx_crypt,
152 .decrypt = ctr_aes_nx_crypt,
153 }
154 };
155
156 struct crypto_alg nx_ctr3686_aes_alg = {
157 .cra_name = "rfc3686(ctr(aes))",
158 .cra_driver_name = "rfc3686-ctr-aes-nx",
159 .cra_priority = 300,
160 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
161 .cra_blocksize = 1,
162 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
163 .cra_type = &crypto_blkcipher_type,
164 .cra_module = THIS_MODULE,
165 .cra_init = nx_crypto_ctx_aes_ctr_init,
166 .cra_exit = nx_crypto_ctx_exit,
167 .cra_blkcipher = {
168 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
169 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
170 .ivsize = CTR_RFC3686_IV_SIZE,
171 .geniv = "seqiv",
172 .setkey = ctr3686_aes_nx_set_key,
173 .encrypt = ctr3686_aes_nx_crypt,
174 .decrypt = ctr3686_aes_nx_crypt,
175 }
176 };
177