177 lines
4.8 KiB
C
177 lines
4.8 KiB
C
/**
|
|
* AES CTR routines supporting the Power 7+ Nest Accelerators driver
|
|
*
|
|
* Copyright (C) 2011-2012 International Business Machines Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 only.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* Author: Kent Yoder <yoder1@us.ibm.com>
|
|
*/
|
|
|
|
#include <crypto/aes.h>
|
|
#include <crypto/ctr.h>
|
|
#include <crypto/algapi.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/crypto.h>
|
|
#include <asm/vio.h>
|
|
|
|
#include "nx_csbcpb.h"
|
|
#include "nx.h"
|
|
|
|
|
|
static int ctr_aes_nx_set_key(struct crypto_tfm *tfm,
|
|
const u8 *in_key,
|
|
unsigned int key_len)
|
|
{
|
|
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
|
|
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
|
|
|
|
nx_ctx_init(nx_ctx, HCOP_FC_AES);
|
|
|
|
switch (key_len) {
|
|
case AES_KEYSIZE_128:
|
|
NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
|
|
nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
|
|
break;
|
|
case AES_KEYSIZE_192:
|
|
NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
|
|
nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
|
|
break;
|
|
case AES_KEYSIZE_256:
|
|
NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
|
|
nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
csbcpb->cpb.hdr.mode = NX_MODE_AES_CTR;
|
|
memcpy(csbcpb->cpb.aes_ctr.key, in_key, key_len);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ctr3686_aes_nx_set_key(struct crypto_tfm *tfm,
|
|
const u8 *in_key,
|
|
unsigned int key_len)
|
|
{
|
|
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
|
|
|
|
if (key_len < CTR_RFC3686_NONCE_SIZE)
|
|
return -EINVAL;
|
|
|
|
memcpy(nx_ctx->priv.ctr.iv,
|
|
in_key + key_len - CTR_RFC3686_NONCE_SIZE,
|
|
CTR_RFC3686_NONCE_SIZE);
|
|
|
|
key_len -= CTR_RFC3686_NONCE_SIZE;
|
|
|
|
return ctr_aes_nx_set_key(tfm, in_key, key_len);
|
|
}
|
|
|
|
static int ctr_aes_nx_crypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
|
|
int rc;
|
|
|
|
if (nbytes > nx_ctx->ap->databytelen)
|
|
return -EINVAL;
|
|
|
|
rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes,
|
|
csbcpb->cpb.aes_ctr.iv);
|
|
if (rc)
|
|
goto out;
|
|
|
|
if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
|
|
desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
|
|
if (rc)
|
|
goto out;
|
|
|
|
atomic_inc(&(nx_ctx->stats->aes_ops));
|
|
atomic64_add(csbcpb->csb.processed_byte_count,
|
|
&(nx_ctx->stats->aes_bytes));
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int ctr3686_aes_nx_crypt(struct blkcipher_desc *desc,
|
|
struct scatterlist *dst,
|
|
struct scatterlist *src,
|
|
unsigned int nbytes)
|
|
{
|
|
struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
|
|
u8 *iv = nx_ctx->priv.ctr.iv;
|
|
|
|
memcpy(iv + CTR_RFC3686_NONCE_SIZE,
|
|
desc->info, CTR_RFC3686_IV_SIZE);
|
|
iv[15] = 1;
|
|
|
|
desc->info = nx_ctx->priv.ctr.iv;
|
|
|
|
return ctr_aes_nx_crypt(desc, dst, src, nbytes);
|
|
}
|
|
|
|
struct crypto_alg nx_ctr_aes_alg = {
|
|
.cra_name = "ctr(aes)",
|
|
.cra_driver_name = "ctr-aes-nx",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct nx_crypto_ctx),
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = nx_crypto_ctx_aes_ctr_init,
|
|
.cra_exit = nx_crypto_ctx_exit,
|
|
.cra_blkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
.ivsize = AES_BLOCK_SIZE,
|
|
.setkey = ctr_aes_nx_set_key,
|
|
.encrypt = ctr_aes_nx_crypt,
|
|
.decrypt = ctr_aes_nx_crypt,
|
|
}
|
|
};
|
|
|
|
struct crypto_alg nx_ctr3686_aes_alg = {
|
|
.cra_name = "rfc3686(ctr(aes))",
|
|
.cra_driver_name = "rfc3686-ctr-aes-nx",
|
|
.cra_priority = 300,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct nx_crypto_ctx),
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_init = nx_crypto_ctx_aes_ctr_init,
|
|
.cra_exit = nx_crypto_ctx_exit,
|
|
.cra_blkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
|
|
.ivsize = CTR_RFC3686_IV_SIZE,
|
|
.geniv = "seqiv",
|
|
.setkey = ctr3686_aes_nx_set_key,
|
|
.encrypt = ctr3686_aes_nx_crypt,
|
|
.decrypt = ctr3686_aes_nx_crypt,
|
|
}
|
|
};
|