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authorKent Yoder <key@linux.vnet.ibm.com>2012-05-14 07:05:30 -0400
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2012-05-16 01:05:42 -0400
commit166659bce2e1d3f884c238daa3de6ed059ae960d (patch)
tree1ab8d0f0f7f4a14cdaba76111daf67ee18b92a7e /drivers/crypto/nx
parenta00bd6e60a341d6d21f9dfed89a8a7cf82383389 (diff)
powerpc/crypto: AES-CTR mode routines for nx encryption
These routines add support for AES in CTR mode on the Power7+ CPU's in-Nest accelerator driver. Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/crypto/nx')
-rw-r--r--drivers/crypto/nx/nx-aes-ctr.c178
1 files changed, 178 insertions, 0 deletions
diff --git a/drivers/crypto/nx/nx-aes-ctr.c b/drivers/crypto/nx/nx-aes-ctr.c
new file mode 100644
index 000000000000..52d4eb05e8f7
--- /dev/null
+++ b/drivers/crypto/nx/nx-aes-ctr.c
@@ -0,0 +1,178 @@
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
34static 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
66static 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
84static 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));
114out:
115 return rc;
116}
117
118static 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
135struct 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_list = LIST_HEAD_INIT(nx_ctr_aes_alg.cra_list),
145 .cra_init = nx_crypto_ctx_aes_ctr_init,
146 .cra_exit = nx_crypto_ctx_exit,
147 .cra_blkcipher = {
148 .min_keysize = AES_MIN_KEY_SIZE,
149 .max_keysize = AES_MAX_KEY_SIZE,
150 .ivsize = AES_BLOCK_SIZE,
151 .setkey = ctr_aes_nx_set_key,
152 .encrypt = ctr_aes_nx_crypt,
153 .decrypt = ctr_aes_nx_crypt,
154 }
155};
156
157struct crypto_alg nx_ctr3686_aes_alg = {
158 .cra_name = "rfc3686(ctr(aes))",
159 .cra_driver_name = "rfc3686-ctr-aes-nx",
160 .cra_priority = 300,
161 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
162 .cra_blocksize = 1,
163 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
164 .cra_type = &crypto_blkcipher_type,
165 .cra_module = THIS_MODULE,
166 .cra_list = LIST_HEAD_INIT(nx_ctr3686_aes_alg.cra_list),
167 .cra_init = nx_crypto_ctx_aes_ctr_init,
168 .cra_exit = nx_crypto_ctx_exit,
169 .cra_blkcipher = {
170 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
171 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
172 .ivsize = CTR_RFC3686_IV_SIZE,
173 .geniv = "seqiv",
174 .setkey = ctr3686_aes_nx_set_key,
175 .encrypt = ctr3686_aes_nx_crypt,
176 .decrypt = ctr3686_aes_nx_crypt,
177 }
178};
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