[mirror_ubuntu-jammy-kernel.git] / drivers / crypto / nx / nx-aes-cbc.c

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

	return 0;
}

static int cbc_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, 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,
				   desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
		if (rc)
			goto out;

		memcpy(desc->info, 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 < nbytes);
out:
	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
	return rc;
}

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

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

struct crypto_alg nx_cbc_aes_alg = {
	.cra_name        = "cbc(aes)",
	.cra_driver_name = "cbc-aes-nx",
	.cra_priority    = 300,
	.cra_flags       = CRYPTO_ALG_TYPE_BLKCIPHER,
	.cra_blocksize   = AES_BLOCK_SIZE,
	.cra_ctxsize     = sizeof(struct nx_crypto_ctx),
	.cra_type        = &crypto_blkcipher_type,
	.cra_alignmask   = 0xf,
	.cra_module      = THIS_MODULE,
	.cra_init        = nx_crypto_ctx_aes_cbc_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      = cbc_aes_nx_set_key,
		.encrypt     = cbc_aes_nx_encrypt,
		.decrypt     = cbc_aes_nx_decrypt,
	}
};
Commit	Line	Data
64d85cc9	1	// SPDX-License-Identifier: GPL-2.0-only
856d6734 KY	2	/**
	3	* AES CBC routines supporting the Power 7+ Nest Accelerators driver
	4	*
	5	* Copyright (C) 2011-2012 International Business Machines Inc.
	6	*
856d6734 KY	7	* Author: Kent Yoder <yoder1@us.ibm.com>
	8	*/
	9
	10	#include <crypto/aes.h>
	11	#include <crypto/algapi.h>
	12	#include <linux/module.h>
	13	#include <linux/types.h>
	14	#include <linux/crypto.h>
	15	#include <asm/vio.h>
	16
	17	#include "nx_csbcpb.h"
	18	#include "nx.h"
	19
	20
	21	static int cbc_aes_nx_set_key(struct crypto_tfm *tfm,
	22	const u8 *in_key,
	23	unsigned int key_len)
	24	{
	25	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
	26	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
	27
	28	nx_ctx_init(nx_ctx, HCOP_FC_AES);
	29
	30	switch (key_len) {
	31	case AES_KEYSIZE_128:
	32	NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
	33	nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
	34	break;
	35	case AES_KEYSIZE_192:
	36	NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
	37	nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
	38	break;
	39	case AES_KEYSIZE_256:
	40	NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
	41	nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
	42	break;
	43	default:
	44	return -EINVAL;
	45	}
	46
	47	csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC;
	48	memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len);
	49
	50	return 0;
	51	}
	52
	53	static int cbc_aes_nx_crypt(struct blkcipher_desc *desc,
	54	struct scatterlist *dst,
	55	struct scatterlist *src,
	56	unsigned int nbytes,
	57	int enc)
	58	{
	59	struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
	60	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
c849163b	61	unsigned long irq_flags;
2d290f02	62	unsigned int processed = 0, to_process;
856d6734 KY	63	int rc;
856d6734 KY	64
c849163b MC	65	spin_lock_irqsave(&nx_ctx->lock, irq_flags);
c849163b MC	66
856d6734 KY	67	if (enc)
	68	NX_CPB_FDM(csbcpb) \|= NX_FDM_ENDE_ENCRYPT;
	69	else
	70	NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
	71
2d290f02	72	do {
ac0f0a8a	73	to_process = nbytes - processed;
2d290f02	74
ac0f0a8a	75	rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,
2d290f02 MC	76	processed, csbcpb->cpb.aes_cbc.iv);
	77	if (rc)
	78	goto out;
	79
	80	if (!nx_ctx->op.inlen \|\| !nx_ctx->op.outlen) {
	81	rc = -EINVAL;
	82	goto out;
	83	}
	84
	85	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
	86	desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
	87	if (rc)
	88	goto out;
	89
	90	memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
	91	atomic_inc(&(nx_ctx->stats->aes_ops));
	92	atomic64_add(csbcpb->csb.processed_byte_count,
	93	&(nx_ctx->stats->aes_bytes));
	94
	95	processed += to_process;
	96	} while (processed < nbytes);
856d6734	97	out:
c849163b	98	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
856d6734 KY	99	return rc;
	100	}
	101
	102	static int cbc_aes_nx_encrypt(struct blkcipher_desc *desc,
	103	struct scatterlist *dst,
	104	struct scatterlist *src,
	105	unsigned int nbytes)
	106	{
	107	return cbc_aes_nx_crypt(desc, dst, src, nbytes, 1);
	108	}
	109
	110	static int cbc_aes_nx_decrypt(struct blkcipher_desc *desc,
	111	struct scatterlist *dst,
	112	struct scatterlist *src,
	113	unsigned int nbytes)
	114	{
	115	return cbc_aes_nx_crypt(desc, dst, src, nbytes, 0);
	116	}
	117
	118	struct crypto_alg nx_cbc_aes_alg = {
	119	.cra_name = "cbc(aes)",
	120	.cra_driver_name = "cbc-aes-nx",
	121	.cra_priority = 300,
	122	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
	123	.cra_blocksize = AES_BLOCK_SIZE,
	124	.cra_ctxsize = sizeof(struct nx_crypto_ctx),
	125	.cra_type = &crypto_blkcipher_type,
1ad936e8	126	.cra_alignmask = 0xf,
856d6734	127	.cra_module = THIS_MODULE,
856d6734 KY	128	.cra_init = nx_crypto_ctx_aes_cbc_init,
	129	.cra_exit = nx_crypto_ctx_exit,
	130	.cra_blkcipher = {
	131	.min_keysize = AES_MIN_KEY_SIZE,
	132	.max_keysize = AES_MAX_KEY_SIZE,
	133	.ivsize = AES_BLOCK_SIZE,
	134	.setkey = cbc_aes_nx_set_key,
	135	.encrypt = cbc_aes_nx_encrypt,
	136	.decrypt = cbc_aes_nx_decrypt,
	137	}
	138	};