// SPDX-License-Identifier: GPL-2.0-only
|
/**
|
* AES CBC routines supporting the Power 7+ Nest Accelerators driver
|
*
|
* Copyright (C) 2011-2012 International Business Machines Inc.
|
*
|
* Author: Kent Yoder <yoder1@us.ibm.com>
|
*/
|
|
#include <crypto/aes.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 cbc_aes_nx_set_key(struct crypto_skcipher *tfm,
|
const u8 *in_key,
|
unsigned int key_len)
|
{
|
struct nx_crypto_ctx *nx_ctx = crypto_skcipher_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_CBC;
|
memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len);
|
|
return 0;
|
}
|
|
static int cbc_aes_nx_crypt(struct skcipher_request *req,
|
int enc)
|
{
|
struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
|
struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
|
struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
|
unsigned long irq_flags;
|
unsigned int processed = 0, to_process;
|
int rc;
|
|
spin_lock_irqsave(&nx_ctx->lock, irq_flags);
|
|
if (enc)
|
NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
|
else
|
NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
|
|
do {
|
to_process = req->cryptlen - processed;
|
|
rc = nx_build_sg_lists(nx_ctx, req->iv, req->dst, req->src,
|
&to_process, processed,
|
csbcpb->cpb.aes_cbc.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,
|
req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
|
if (rc)
|
goto out;
|
|
memcpy(req->iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
|
atomic_inc(&(nx_ctx->stats->aes_ops));
|
atomic64_add(csbcpb->csb.processed_byte_count,
|
&(nx_ctx->stats->aes_bytes));
|
|
processed += to_process;
|
} while (processed < req->cryptlen);
|
out:
|
spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
|
return rc;
|
}
|
|
static int cbc_aes_nx_encrypt(struct skcipher_request *req)
|
{
|
return cbc_aes_nx_crypt(req, 1);
|
}
|
|
static int cbc_aes_nx_decrypt(struct skcipher_request *req)
|
{
|
return cbc_aes_nx_crypt(req, 0);
|
}
|
|
struct skcipher_alg nx_cbc_aes_alg = {
|
.base.cra_name = "cbc(aes)",
|
.base.cra_driver_name = "cbc-aes-nx",
|
.base.cra_priority = 300,
|
.base.cra_blocksize = AES_BLOCK_SIZE,
|
.base.cra_ctxsize = sizeof(struct nx_crypto_ctx),
|
.base.cra_alignmask = 0xf,
|
.base.cra_module = THIS_MODULE,
|
.init = nx_crypto_ctx_aes_cbc_init,
|
.exit = nx_crypto_ctx_skcipher_exit,
|
.min_keysize = AES_MIN_KEY_SIZE,
|
.max_keysize = AES_MAX_KEY_SIZE,
|
.ivsize = AES_BLOCK_SIZE,
|
.setkey = cbc_aes_nx_set_key,
|
.encrypt = cbc_aes_nx_encrypt,
|
.decrypt = cbc_aes_nx_decrypt,
|
};
|
