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>
30 #include "nx_csbcpb.h"
34 static int ctr_aes_nx_set_key(struct crypto_tfm *tfm,
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);
45 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
46 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
49 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
50 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
53 NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
54 nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
60 csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR;
61 memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len);
66 static int ctr3686_aes_nx_set_key(struct crypto_tfm *tfm,
70 struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
72 if (key_len < CTR_RFC3686_NONCE_SIZE)
75 memcpy(nx_ctx->priv.ctr.iv,
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,
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;
94 spin_lock_irqsave(&nx_ctx->lock, irq_flags);
96 if (nbytes > nx_ctx->ap->databytelen) {
101 rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes, 0,
102 csbcpb->cpb.aes_ctr.iv);
106 if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
111 rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
112 desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
116 atomic_inc(&(nx_ctx->stats->aes_ops));
117 atomic64_add(csbcpb->csb.processed_byte_count,
118 &(nx_ctx->stats->aes_bytes));
120 spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
124 static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc,
125 struct scatterlist *dst,
126 struct scatterlist *src,
129 struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
130 u8 *iv = nx_ctx->priv.ctr.iv;
132 memcpy(iv + CTR_RFC3686_NONCE_SIZE,
133 desc->info, CTR_RFC3686_IV_SIZE);
136 desc->info = nx_ctx->priv.ctr.iv;
138 return ctr_aes_nx_crypt(desc, dst, src, nbytes);
141 struct crypto_alg nx_ctr_aes_alg = {
142 .cra_name = "ctr(aes)",
143 .cra_driver_name = "ctr-aes-nx",
145 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
147 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
148 .cra_type = &crypto_blkcipher_type,
149 .cra_module = THIS_MODULE,
150 .cra_init = nx_crypto_ctx_aes_ctr_init,
151 .cra_exit = nx_crypto_ctx_exit,
153 .min_keysize = AES_MIN_KEY_SIZE,
154 .max_keysize = AES_MAX_KEY_SIZE,
155 .ivsize = AES_BLOCK_SIZE,
156 .setkey = ctr_aes_nx_set_key,
157 .encrypt = ctr_aes_nx_crypt,
158 .decrypt = ctr_aes_nx_crypt,
162 struct crypto_alg nx_ctr3686_aes_alg = {
163 .cra_name = "rfc3686(ctr(aes))",
164 .cra_driver_name = "rfc3686-ctr-aes-nx",
166 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
168 .cra_ctxsize = sizeof(struct nx_crypto_ctx),
169 .cra_type = &crypto_blkcipher_type,
170 .cra_module = THIS_MODULE,
171 .cra_init = nx_crypto_ctx_aes_ctr_init,
172 .cra_exit = nx_crypto_ctx_exit,
174 .min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
175 .max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
176 .ivsize = CTR_RFC3686_IV_SIZE,
178 .setkey = ctr3686_aes_nx_set_key,
179 .encrypt = ctr3686_aes_nx_crypt,
180 .decrypt = ctr3686_aes_nx_crypt,