blob: 69ed796ee327294f5ae1fdbbc1ae858cb1f33b42 [file] [log] [blame]
Kent Yoder856d6732012-05-14 11:05:12 +00001/**
2 * AES CBC 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/algapi.h>
24#include <linux/module.h>
25#include <linux/types.h>
26#include <linux/crypto.h>
27#include <asm/vio.h>
28
29#include "nx_csbcpb.h"
30#include "nx.h"
31
32
33static int cbc_aes_nx_set_key(struct crypto_tfm *tfm,
34 const u8 *in_key,
35 unsigned int key_len)
36{
37 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
38 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
39
40 nx_ctx_init(nx_ctx, HCOP_FC_AES);
41
42 switch (key_len) {
43 case AES_KEYSIZE_128:
44 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
45 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
46 break;
47 case AES_KEYSIZE_192:
48 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
49 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
50 break;
51 case AES_KEYSIZE_256:
52 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
53 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
54 break;
55 default:
56 return -EINVAL;
57 }
58
59 csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC;
60 memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len);
61
62 return 0;
63}
64
65static int cbc_aes_nx_crypt(struct blkcipher_desc *desc,
66 struct scatterlist *dst,
67 struct scatterlist *src,
68 unsigned int nbytes,
69 int enc)
70{
71 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
72 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
73 int rc;
74
75 if (nbytes > nx_ctx->ap->databytelen)
76 return -EINVAL;
77
78 if (enc)
79 NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
80 else
81 NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
82
83 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes,
84 csbcpb->cpb.aes_cbc.iv);
85 if (rc)
86 goto out;
87
88 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
89 rc = -EINVAL;
90 goto out;
91 }
92
93 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
94 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
95 if (rc)
96 goto out;
97
98 atomic_inc(&(nx_ctx->stats->aes_ops));
99 atomic64_add(csbcpb->csb.processed_byte_count,
100 &(nx_ctx->stats->aes_bytes));
101out:
102 return rc;
103}
104
105static int cbc_aes_nx_encrypt(struct blkcipher_desc *desc,
106 struct scatterlist *dst,
107 struct scatterlist *src,
108 unsigned int nbytes)
109{
110 return cbc_aes_nx_crypt(desc, dst, src, nbytes, 1);
111}
112
113static int cbc_aes_nx_decrypt(struct blkcipher_desc *desc,
114 struct scatterlist *dst,
115 struct scatterlist *src,
116 unsigned int nbytes)
117{
118 return cbc_aes_nx_crypt(desc, dst, src, nbytes, 0);
119}
120
121struct crypto_alg nx_cbc_aes_alg = {
122 .cra_name = "cbc(aes)",
123 .cra_driver_name = "cbc-aes-nx",
124 .cra_priority = 300,
125 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
126 .cra_blocksize = AES_BLOCK_SIZE,
127 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
128 .cra_type = &crypto_blkcipher_type,
129 .cra_module = THIS_MODULE,
130 .cra_list = LIST_HEAD_INIT(nx_cbc_aes_alg.cra_list),
131 .cra_init = nx_crypto_ctx_aes_cbc_init,
132 .cra_exit = nx_crypto_ctx_exit,
133 .cra_blkcipher = {
134 .min_keysize = AES_MIN_KEY_SIZE,
135 .max_keysize = AES_MAX_KEY_SIZE,
136 .ivsize = AES_BLOCK_SIZE,
137 .setkey = cbc_aes_nx_set_key,
138 .encrypt = cbc_aes_nx_encrypt,
139 .decrypt = cbc_aes_nx_decrypt,
140 }
141};