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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/crypto/nx/nx-aes-cbc.c
26282 views
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// SPDX-License-Identifier: GPL-2.0-only

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/*

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 * AES CBC routines supporting the Power 7+ Nest Accelerators driver

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 *

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 * Copyright (C) 2011-2012 International Business Machines Inc.

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 *

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 * Author: Kent Yoder <[email protected]>

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 */

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#include <crypto/aes.h>

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#include <crypto/internal/skcipher.h>

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#include <linux/err.h>

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#include <linux/kernel.h>

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#include <linux/module.h>

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#include <linux/spinlock.h>

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#include <linux/string.h>

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#include <asm/vio.h>

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#include "nx_csbcpb.h"

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#include "nx.h"

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static int cbc_aes_nx_set_key(struct crypto_skcipher *tfm,

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			      const u8               *in_key,

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			      unsigned int            key_len)

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{

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	struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);

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	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;

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	nx_ctx_init(nx_ctx, HCOP_FC_AES);

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	switch (key_len) {

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	case AES_KEYSIZE_128:

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		NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);

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		nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];

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		break;

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	case AES_KEYSIZE_192:

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		NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);

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		nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];

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		break;

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	case AES_KEYSIZE_256:

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		NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);

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		nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];

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		break;

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	default:

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		return -EINVAL;

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	}

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	csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC;

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	memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len);

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	return 0;

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}

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static int cbc_aes_nx_crypt(struct skcipher_request *req,

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			    int                      enc)

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{

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	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);

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	struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);

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	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;

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	unsigned long irq_flags;

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	unsigned int processed = 0, to_process;

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	int rc;

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	spin_lock_irqsave(&nx_ctx->lock, irq_flags);

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	if (enc)

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		NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;

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	else

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		NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;

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	do {

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		to_process = req->cryptlen - processed;

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		rc = nx_build_sg_lists(nx_ctx, req->iv, req->dst, req->src,

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				       &to_process, processed,

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				       csbcpb->cpb.aes_cbc.iv);

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		if (rc)

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			goto out;

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		if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {

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			rc = -EINVAL;

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			goto out;

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		}

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		rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,

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				   req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);

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		if (rc)

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			goto out;

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		memcpy(req->iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);

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		atomic_inc(&(nx_ctx->stats->aes_ops));

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		atomic64_add(be32_to_cpu(csbcpb->csb.processed_byte_count),

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			     &(nx_ctx->stats->aes_bytes));

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		processed += to_process;

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	} while (processed < req->cryptlen);

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out:

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	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);

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	return rc;

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}

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static int cbc_aes_nx_encrypt(struct skcipher_request *req)

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{

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	return cbc_aes_nx_crypt(req, 1);

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}

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static int cbc_aes_nx_decrypt(struct skcipher_request *req)

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{

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	return cbc_aes_nx_crypt(req, 0);

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}

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struct skcipher_alg nx_cbc_aes_alg = {

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	.base.cra_name		= "cbc(aes)",

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	.base.cra_driver_name	= "cbc-aes-nx",

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	.base.cra_priority	= 300,

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	.base.cra_blocksize	= AES_BLOCK_SIZE,

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	.base.cra_ctxsize	= sizeof(struct nx_crypto_ctx),

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	.base.cra_alignmask	= 0xf,

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	.base.cra_module	= THIS_MODULE,

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	.init			= nx_crypto_ctx_aes_cbc_init,

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	.exit			= nx_crypto_ctx_skcipher_exit,

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	.min_keysize		= AES_MIN_KEY_SIZE,

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	.max_keysize		= AES_MAX_KEY_SIZE,

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	.ivsize			= AES_BLOCK_SIZE,

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	.setkey			= cbc_aes_nx_set_key,

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	.encrypt		= cbc_aes_nx_encrypt,

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	.decrypt		= cbc_aes_nx_decrypt,

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};

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