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cc625089 KY |
1 | /** |
2 | * AES ECB 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 | ||
33 | static int ecb_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 = (struct nx_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_ECB; | |
60 | memcpy(csbcpb->cpb.aes_ecb.key, in_key, key_len); | |
61 | ||
62 | return 0; | |
63 | } | |
64 | ||
65 | static int ecb_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; | |
c849163b | 73 | unsigned long irq_flags; |
ab741759 | 74 | unsigned int processed = 0, to_process; |
cc625089 KY |
75 | int rc; |
76 | ||
c849163b MC |
77 | spin_lock_irqsave(&nx_ctx->lock, irq_flags); |
78 | ||
cc625089 KY |
79 | if (enc) |
80 | NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT; | |
81 | else | |
82 | NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT; | |
83 | ||
ab741759 | 84 | do { |
c7b675de | 85 | to_process = nbytes - processed; |
cc625089 | 86 | |
c7b675de | 87 | rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process, |
ab741759 MC |
88 | processed, NULL); |
89 | if (rc) | |
90 | goto out; | |
91 | ||
92 | if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { | |
93 | rc = -EINVAL; | |
94 | goto out; | |
95 | } | |
96 | ||
97 | rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, | |
98 | desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); | |
99 | if (rc) | |
100 | goto out; | |
101 | ||
102 | atomic_inc(&(nx_ctx->stats->aes_ops)); | |
103 | atomic64_add(csbcpb->csb.processed_byte_count, | |
104 | &(nx_ctx->stats->aes_bytes)); | |
cc625089 | 105 | |
ab741759 MC |
106 | processed += to_process; |
107 | } while (processed < nbytes); | |
cc625089 | 108 | |
cc625089 | 109 | out: |
c849163b | 110 | spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); |
cc625089 KY |
111 | return rc; |
112 | } | |
113 | ||
114 | static int ecb_aes_nx_encrypt(struct blkcipher_desc *desc, | |
115 | struct scatterlist *dst, | |
116 | struct scatterlist *src, | |
117 | unsigned int nbytes) | |
118 | { | |
119 | return ecb_aes_nx_crypt(desc, dst, src, nbytes, 1); | |
120 | } | |
121 | ||
122 | static int ecb_aes_nx_decrypt(struct blkcipher_desc *desc, | |
123 | struct scatterlist *dst, | |
124 | struct scatterlist *src, | |
125 | unsigned int nbytes) | |
126 | { | |
127 | return ecb_aes_nx_crypt(desc, dst, src, nbytes, 0); | |
128 | } | |
129 | ||
130 | struct crypto_alg nx_ecb_aes_alg = { | |
131 | .cra_name = "ecb(aes)", | |
132 | .cra_driver_name = "ecb-aes-nx", | |
133 | .cra_priority = 300, | |
134 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
135 | .cra_blocksize = AES_BLOCK_SIZE, | |
1ad936e8 | 136 | .cra_alignmask = 0xf, |
cc625089 KY |
137 | .cra_ctxsize = sizeof(struct nx_crypto_ctx), |
138 | .cra_type = &crypto_blkcipher_type, | |
139 | .cra_module = THIS_MODULE, | |
cc625089 KY |
140 | .cra_init = nx_crypto_ctx_aes_ecb_init, |
141 | .cra_exit = nx_crypto_ctx_exit, | |
142 | .cra_blkcipher = { | |
143 | .min_keysize = AES_MIN_KEY_SIZE, | |
144 | .max_keysize = AES_MAX_KEY_SIZE, | |
145 | .setkey = ecb_aes_nx_set_key, | |
146 | .encrypt = ecb_aes_nx_encrypt, | |
147 | .decrypt = ecb_aes_nx_decrypt, | |
148 | } | |
149 | }; |