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Kent Yoder166659b2012-05-14 11:05:30 +00001/**
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;
Marcelo Cerric8491632013-08-12 18:49:37 -030091 unsigned long irq_flags;
Marcelo Cerri884d9812013-08-29 11:36:34 -030092 unsigned int processed = 0, to_process;
93 u32 max_sg_len;
Kent Yoder166659b2012-05-14 11:05:30 +000094 int rc;
95
Marcelo Cerric8491632013-08-12 18:49:37 -030096 spin_lock_irqsave(&nx_ctx->lock, irq_flags);
97
Marcelo Cerri884d9812013-08-29 11:36:34 -030098 max_sg_len = min_t(u32, nx_driver.of.max_sg_len/sizeof(struct nx_sg),
99 nx_ctx->ap->sglen);
Kent Yoder166659b2012-05-14 11:05:30 +0000100
Marcelo Cerri884d9812013-08-29 11:36:34 -0300101 do {
102 to_process = min_t(u64, nbytes - processed,
103 nx_ctx->ap->databytelen);
104 to_process = min_t(u64, to_process,
105 NX_PAGE_SIZE * (max_sg_len - 1));
106 to_process = to_process & ~(AES_BLOCK_SIZE - 1);
Kent Yoder166659b2012-05-14 11:05:30 +0000107
Marcelo Cerri884d9812013-08-29 11:36:34 -0300108 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, to_process,
109 processed, csbcpb->cpb.aes_ctr.iv);
110 if (rc)
111 goto out;
Kent Yoder166659b2012-05-14 11:05:30 +0000112
Marcelo Cerri884d9812013-08-29 11:36:34 -0300113 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
114 rc = -EINVAL;
115 goto out;
116 }
Kent Yoder166659b2012-05-14 11:05:30 +0000117
Marcelo Cerri884d9812013-08-29 11:36:34 -0300118 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
119 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
120 if (rc)
121 goto out;
122
123 memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
124
125 atomic_inc(&(nx_ctx->stats->aes_ops));
126 atomic64_add(csbcpb->csb.processed_byte_count,
127 &(nx_ctx->stats->aes_bytes));
128
129 processed += to_process;
130 } while (processed < nbytes);
Kent Yoder166659b2012-05-14 11:05:30 +0000131out:
Marcelo Cerric8491632013-08-12 18:49:37 -0300132 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
Kent Yoder166659b2012-05-14 11:05:30 +0000133 return rc;
134}
135
136static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc,
137 struct scatterlist *dst,
138 struct scatterlist *src,
139 unsigned int nbytes)
140{
141 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
142 u8 *iv = nx_ctx->priv.ctr.iv;
143
144 memcpy(iv + CTR_RFC3686_NONCE_SIZE,
145 desc->info, CTR_RFC3686_IV_SIZE);
146 iv[15] = 1;
147
148 desc->info = nx_ctx->priv.ctr.iv;
149
150 return ctr_aes_nx_crypt(desc, dst, src, nbytes);
151}
152
153struct crypto_alg nx_ctr_aes_alg = {
154 .cra_name = "ctr(aes)",
155 .cra_driver_name = "ctr-aes-nx",
156 .cra_priority = 300,
157 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
158 .cra_blocksize = 1,
159 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
160 .cra_type = &crypto_blkcipher_type,
161 .cra_module = THIS_MODULE,
Kent Yoder166659b2012-05-14 11:05:30 +0000162 .cra_init = nx_crypto_ctx_aes_ctr_init,
163 .cra_exit = nx_crypto_ctx_exit,
164 .cra_blkcipher = {
165 .min_keysize = AES_MIN_KEY_SIZE,
166 .max_keysize = AES_MAX_KEY_SIZE,
167 .ivsize = AES_BLOCK_SIZE,
168 .setkey = ctr_aes_nx_set_key,
169 .encrypt = ctr_aes_nx_crypt,
170 .decrypt = ctr_aes_nx_crypt,
171 }
172};
173
174struct crypto_alg nx_ctr3686_aes_alg = {
175 .cra_name = "rfc3686(ctr(aes))",
176 .cra_driver_name = "rfc3686-ctr-aes-nx",
177 .cra_priority = 300,
178 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
179 .cra_blocksize = 1,
180 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
181 .cra_type = &crypto_blkcipher_type,
182 .cra_module = THIS_MODULE,
Kent Yoder166659b2012-05-14 11:05:30 +0000183 .cra_init = nx_crypto_ctx_aes_ctr_init,
184 .cra_exit = nx_crypto_ctx_exit,
185 .cra_blkcipher = {
186 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
187 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
188 .ivsize = CTR_RFC3686_IV_SIZE,
189 .geniv = "seqiv",
190 .setkey = ctr3686_aes_nx_set_key,
191 .encrypt = ctr3686_aes_nx_crypt,
192 .decrypt = ctr3686_aes_nx_crypt,
193 }
194};