Linux 4.1.16
[linux/fpc-iii.git] / drivers / crypto / nx / nx-aes-ctr.c
blobdd7e9f3f5b6b2edfb0a4e1c1e442523a30d4f74b
1 /**
2 * AES CTR routines supporting the Power 7+ Nest Accelerators driver
4 * Copyright (C) 2011-2012 International Business Machines Inc.
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.
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.
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.
19 * Author: Kent Yoder <yoder1@us.ibm.com>
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>
30 #include "nx_csbcpb.h"
31 #include "nx.h"
34 static int ctr_aes_nx_set_key(struct crypto_tfm *tfm,
35 const u8 *in_key,
36 unsigned int key_len)
38 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
39 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
41 nx_ctx_init(nx_ctx, HCOP_FC_AES);
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;
60 csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR;
61 memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len);
63 return 0;
66 static int ctr3686_aes_nx_set_key(struct crypto_tfm *tfm,
67 const u8 *in_key,
68 unsigned int key_len)
70 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
72 if (key_len < CTR_RFC3686_NONCE_SIZE)
73 return -EINVAL;
75 memcpy(nx_ctx->priv.ctr.nonce,
76 in_key + key_len - CTR_RFC3686_NONCE_SIZE,
77 CTR_RFC3686_NONCE_SIZE);
79 key_len -= CTR_RFC3686_NONCE_SIZE;
81 return ctr_aes_nx_set_key(tfm, in_key, key_len);
84 static int ctr_aes_nx_crypt(struct blkcipher_desc *desc,
85 struct scatterlist *dst,
86 struct scatterlist *src,
87 unsigned int nbytes)
89 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
90 struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
91 unsigned long irq_flags;
92 unsigned int processed = 0, to_process;
93 int rc;
95 spin_lock_irqsave(&nx_ctx->lock, irq_flags);
97 do {
98 to_process = nbytes - processed;
100 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,
101 processed, csbcpb->cpb.aes_ctr.iv);
102 if (rc)
103 goto out;
105 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
106 rc = -EINVAL;
107 goto out;
110 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
111 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
112 if (rc)
113 goto out;
115 memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
117 atomic_inc(&(nx_ctx->stats->aes_ops));
118 atomic64_add(csbcpb->csb.processed_byte_count,
119 &(nx_ctx->stats->aes_bytes));
121 processed += to_process;
122 } while (processed < nbytes);
123 out:
124 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
125 return rc;
128 static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc,
129 struct scatterlist *dst,
130 struct scatterlist *src,
131 unsigned int nbytes)
133 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
134 u8 iv[16];
136 memcpy(iv, nx_ctx->priv.ctr.nonce, CTR_RFC3686_IV_SIZE);
137 memcpy(iv + CTR_RFC3686_NONCE_SIZE,
138 desc->info, CTR_RFC3686_IV_SIZE);
139 iv[12] = iv[13] = iv[14] = 0;
140 iv[15] = 1;
142 desc->info = iv;
144 return ctr_aes_nx_crypt(desc, dst, src, nbytes);
147 struct crypto_alg nx_ctr_aes_alg = {
148 .cra_name = "ctr(aes)",
149 .cra_driver_name = "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,
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,
160 .max_keysize = AES_MAX_KEY_SIZE,
161 .ivsize = AES_BLOCK_SIZE,
162 .setkey = ctr_aes_nx_set_key,
163 .encrypt = ctr_aes_nx_crypt,
164 .decrypt = ctr_aes_nx_crypt,
168 struct crypto_alg nx_ctr3686_aes_alg = {
169 .cra_name = "rfc3686(ctr(aes))",
170 .cra_driver_name = "rfc3686-ctr-aes-nx",
171 .cra_priority = 300,
172 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
173 .cra_blocksize = 1,
174 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
175 .cra_type = &crypto_blkcipher_type,
176 .cra_module = THIS_MODULE,
177 .cra_init = nx_crypto_ctx_aes_ctr_init,
178 .cra_exit = nx_crypto_ctx_exit,
179 .cra_blkcipher = {
180 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
181 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
182 .ivsize = CTR_RFC3686_IV_SIZE,
183 .geniv = "seqiv",
184 .setkey = ctr3686_aes_nx_set_key,
185 .encrypt = ctr3686_aes_nx_crypt,
186 .decrypt = ctr3686_aes_nx_crypt,