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166659bc KY |
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 | ||
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 | ||
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 | ||
030f4e96 | 75 | memcpy(nx_ctx->priv.ctr.nonce, |
166659bc KY |
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 | ||
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; | |
c849163b | 91 | unsigned long irq_flags; |
884d981b | 92 | unsigned int processed = 0, to_process; |
166659bc KY |
93 | int rc; |
94 | ||
c849163b MC |
95 | spin_lock_irqsave(&nx_ctx->lock, irq_flags); |
96 | ||
884d981b | 97 | do { |
01a5aa08 | 98 | to_process = nbytes - processed; |
166659bc | 99 | |
01a5aa08 | 100 | rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process, |
884d981b MC |
101 | processed, csbcpb->cpb.aes_ctr.iv); |
102 | if (rc) | |
103 | goto out; | |
104 | ||
105 | if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) { | |
106 | rc = -EINVAL; | |
107 | goto out; | |
108 | } | |
109 | ||
110 | rc = nx_hcall_sync(nx_ctx, &nx_ctx->op, | |
111 | desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP); | |
112 | if (rc) | |
113 | goto out; | |
114 | ||
115 | memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE); | |
166659bc | 116 | |
884d981b MC |
117 | atomic_inc(&(nx_ctx->stats->aes_ops)); |
118 | atomic64_add(csbcpb->csb.processed_byte_count, | |
119 | &(nx_ctx->stats->aes_bytes)); | |
166659bc | 120 | |
884d981b MC |
121 | processed += to_process; |
122 | } while (processed < nbytes); | |
166659bc | 123 | out: |
c849163b | 124 | spin_unlock_irqrestore(&nx_ctx->lock, irq_flags); |
166659bc KY |
125 | return rc; |
126 | } | |
127 | ||
128 | static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc, | |
129 | struct scatterlist *dst, | |
130 | struct scatterlist *src, | |
131 | unsigned int nbytes) | |
132 | { | |
133 | struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm); | |
030f4e96 | 134 | u8 iv[16]; |
166659bc | 135 | |
030f4e96 | 136 | memcpy(iv, nx_ctx->priv.ctr.nonce, CTR_RFC3686_IV_SIZE); |
166659bc KY |
137 | memcpy(iv + CTR_RFC3686_NONCE_SIZE, |
138 | desc->info, CTR_RFC3686_IV_SIZE); | |
01a5aa08 | 139 | iv[12] = iv[13] = iv[14] = 0; |
166659bc KY |
140 | iv[15] = 1; |
141 | ||
030f4e96 | 142 | desc->info = iv; |
166659bc KY |
143 | |
144 | return ctr_aes_nx_crypt(desc, dst, src, nbytes); | |
145 | } | |
146 | ||
166659bc KY |
147 | struct crypto_alg nx_ctr3686_aes_alg = { |
148 | .cra_name = "rfc3686(ctr(aes))", | |
149 | .cra_driver_name = "rfc3686-ctr-aes-nx", | |
150 | .cra_priority = 300, | |
151 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
152 | .cra_blocksize = 1, | |
153 | .cra_ctxsize = sizeof(struct nx_crypto_ctx), | |
154 | .cra_type = &crypto_blkcipher_type, | |
155 | .cra_module = THIS_MODULE, | |
166659bc KY |
156 | .cra_init = nx_crypto_ctx_aes_ctr_init, |
157 | .cra_exit = nx_crypto_ctx_exit, | |
158 | .cra_blkcipher = { | |
159 | .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, | |
160 | .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE, | |
161 | .ivsize = CTR_RFC3686_IV_SIZE, | |
162 | .geniv = "seqiv", | |
163 | .setkey = ctr3686_aes_nx_set_key, | |
164 | .encrypt = ctr3686_aes_nx_crypt, | |
165 | .decrypt = ctr3686_aes_nx_crypt, | |
166 | } | |
167 | }; |