[deliverable/linux.git] / drivers / crypto / nx / nx-aes-ecb.c

/**
 * AES ECB 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/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 ecb_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 = (struct nx_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_ECB;
	memcpy(csbcpb->cpb.aes_ecb.key, in_key, key_len);

	return 0;
}

static int ecb_aes_nx_crypt(struct blkcipher_desc *desc,
			    struct scatterlist    *dst,
			    struct scatterlist    *src,
			    unsigned int           nbytes,
			    int                    enc)
{
	struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->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 = nbytes - processed;

		rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,
				processed, NULL);
		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));

		processed += to_process;
	} while (processed < nbytes);

out:
	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
	return rc;
}

static int ecb_aes_nx_encrypt(struct blkcipher_desc *desc,
			      struct scatterlist    *dst,
			      struct scatterlist    *src,
			      unsigned int           nbytes)
{
	return ecb_aes_nx_crypt(desc, dst, src, nbytes, 1);
}

static int ecb_aes_nx_decrypt(struct blkcipher_desc *desc,
			      struct scatterlist    *dst,
			      struct scatterlist    *src,
			      unsigned int           nbytes)
{
	return ecb_aes_nx_crypt(desc, dst, src, nbytes, 0);
}

struct crypto_alg nx_ecb_aes_alg = {
	.cra_name        = "ecb(aes)",
	.cra_driver_name = "ecb-aes-nx",
	.cra_priority    = 300,
	.cra_flags       = CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize   = AES_BLOCK_SIZE,
	.cra_alignmask   = 0xf,
	.cra_ctxsize     = sizeof(struct nx_crypto_ctx),
	.cra_type        = &crypto_blkcipher_type,
	.cra_module      = THIS_MODULE,
	.cra_init        = nx_crypto_ctx_aes_ecb_init,
	.cra_exit        = nx_crypto_ctx_exit,
	.cra_blkcipher = {
		.min_keysize = AES_MIN_KEY_SIZE,
		.max_keysize = AES_MAX_KEY_SIZE,
		.setkey      = ecb_aes_nx_set_key,
		.encrypt     = ecb_aes_nx_encrypt,
		.decrypt     = ecb_aes_nx_decrypt,
	}
};
Commit	Line	Data
cc625089 KY	1	/**
	2	* AES ECB routines supporting the Power 7+ Nest Accelerators driver
	3	*
	4	* Copyright (C) 2011-2012 International Business Machines Inc.
	5	*
	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.
	9	*
	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.
	14	*
	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.
	18	*
	19	* Author: Kent Yoder <yoder1@us.ibm.com>
	20	*/
	21
	22	#include <crypto/aes.h>
	23	#include <crypto/algapi.h>
	24	#include <linux/module.h>
	25	#include <linux/types.h>
	26	#include <linux/crypto.h>
	27	#include <asm/vio.h>
	28
	29	#include "nx_csbcpb.h"
	30	#include "nx.h"
	31
	32
	33	static int ecb_aes_nx_set_key(struct crypto_tfm *tfm,
	34	const u8 *in_key,
	35	unsigned int key_len)
	36	{
	37	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
	38	struct nx_csbcpb csbcpb = (struct nx_csbcpb )nx_ctx->csbcpb;
	39
	40	nx_ctx_init(nx_ctx, HCOP_FC_AES);
	41
	42	switch (key_len) {
	43	case AES_KEYSIZE_128:
	44	NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
	45	nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
	46	break;
	47	case AES_KEYSIZE_192:
	48	NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
	49	nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
	50	break;
	51	case AES_KEYSIZE_256:
	52	NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
	53	nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
	54	break;
	55	default:
	56	return -EINVAL;
	57	}
	58
	59	csbcpb->cpb.hdr.mode = NX_MODE_AES_ECB;
	60	memcpy(csbcpb->cpb.aes_ecb.key, in_key, key_len);
	61
	62	return 0;
	63	}
	64
65	static int ecb_aes_nx_crypt(struct blkcipher_desc *desc,
66	struct scatterlist *dst,
67	struct scatterlist *src,
68	unsigned int nbytes,
69	int enc)
70	{
71	struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
72	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
c849163b	73	unsigned long irq_flags;
ab741759	74	unsigned int processed = 0, to_process;
cc625089 KY	75	int rc;
cc625089 KY	76
c849163b MC	77	spin_lock_irqsave(&nx_ctx->lock, irq_flags);
c849163b MC	78
cc625089 KY	79	if (enc)
	80	NX_CPB_FDM(csbcpb) \|= NX_FDM_ENDE_ENCRYPT;
	81	else
	82	NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
	83
ab741759	84	do {
c7b675de	85	to_process = nbytes - processed;
cc625089	86
c7b675de	87	rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,
ab741759 MC	88	processed, NULL);
	89	if (rc)
	90	goto out;
	91
	92	if (!nx_ctx->op.inlen \|\| !nx_ctx->op.outlen) {
	93	rc = -EINVAL;
	94	goto out;
	95	}
	96
	97	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
	98	desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
	99	if (rc)
	100	goto out;
	101
	102	atomic_inc(&(nx_ctx->stats->aes_ops));
	103	atomic64_add(csbcpb->csb.processed_byte_count,
	104	&(nx_ctx->stats->aes_bytes));
cc625089	105
ab741759 MC	106	processed += to_process;
ab741759 MC	107	} while (processed < nbytes);
cc625089	108
cc625089	109	out:
c849163b	110	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
cc625089 KY	111	return rc;
	112	}
	113
	114	static int ecb_aes_nx_encrypt(struct blkcipher_desc *desc,
	115	struct scatterlist *dst,
	116	struct scatterlist *src,
	117	unsigned int nbytes)
	118	{
	119	return ecb_aes_nx_crypt(desc, dst, src, nbytes, 1);
	120	}
	121
	122	static int ecb_aes_nx_decrypt(struct blkcipher_desc *desc,
	123	struct scatterlist *dst,
	124	struct scatterlist *src,
	125	unsigned int nbytes)
	126	{
	127	return ecb_aes_nx_crypt(desc, dst, src, nbytes, 0);
	128	}
	129
	130	struct crypto_alg nx_ecb_aes_alg = {
	131	.cra_name = "ecb(aes)",
	132	.cra_driver_name = "ecb-aes-nx",
	133	.cra_priority = 300,
	134	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	135	.cra_blocksize = AES_BLOCK_SIZE,
1ad936e8	136	.cra_alignmask = 0xf,
cc625089 KY	137	.cra_ctxsize = sizeof(struct nx_crypto_ctx),
	138	.cra_type = &crypto_blkcipher_type,
	139	.cra_module = THIS_MODULE,
cc625089 KY	140	.cra_init = nx_crypto_ctx_aes_ecb_init,
	141	.cra_exit = nx_crypto_ctx_exit,
	142	.cra_blkcipher = {
	143	.min_keysize = AES_MIN_KEY_SIZE,
	144	.max_keysize = AES_MAX_KEY_SIZE,
	145	.setkey = ecb_aes_nx_set_key,
	146	.encrypt = ecb_aes_nx_encrypt,
	147	.decrypt = ecb_aes_nx_decrypt,
	148	}
	149	};