[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / drivers / crypto / vmx / aes.c

/**
 * AES routines supporting VMX instructions on the Power 8
 *
 * Copyright (C) 2015 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: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
 */

#include <linux/types.h>
#include <linux/err.h>
#include <linux/crypto.h>
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <asm/switch_to.h>
#include <crypto/aes.h>

#include "aesp8-ppc.h"

struct p8_aes_ctx {
	struct crypto_cipher *fallback;
	struct aes_key enc_key;
	struct aes_key dec_key;
};

static int p8_aes_init(struct crypto_tfm *tfm)
{
	const char *alg;
	struct crypto_cipher *fallback;
	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);

	if (!(alg = crypto_tfm_alg_name(tfm))) {
		printk(KERN_ERR "Failed to get algorithm name.\n");
		return -ENOENT;
	}

	fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
	if (IS_ERR(fallback)) {
		printk(KERN_ERR
		       "Failed to allocate transformation for '%s': %ld\n",
		       alg, PTR_ERR(fallback));
		return PTR_ERR(fallback);
	}
	printk(KERN_INFO "Using '%s' as fallback implementation.\n",
	       crypto_tfm_alg_driver_name((struct crypto_tfm *) fallback));

	crypto_cipher_set_flags(fallback,
				crypto_cipher_get_flags((struct
							 crypto_cipher *)
							tfm));
	ctx->fallback = fallback;

	return 0;
}

static void p8_aes_exit(struct crypto_tfm *tfm)
{
	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);

	if (ctx->fallback) {
		crypto_free_cipher(ctx->fallback);
		ctx->fallback = NULL;
	}
}

static int p8_aes_setkey(struct crypto_tfm *tfm, const u8 *key,
			 unsigned int keylen)
{
	int ret;
	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);

	preempt_disable();
	pagefault_disable();
	enable_kernel_vsx();
	ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
	ret += aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
	disable_kernel_vsx();
	pagefault_enable();
	preempt_enable();

	ret += crypto_cipher_setkey(ctx->fallback, key, keylen);
	return ret;
}

static void p8_aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);

	if (in_interrupt()) {
		crypto_cipher_encrypt_one(ctx->fallback, dst, src);
	} else {
		preempt_disable();
		pagefault_disable();
		enable_kernel_vsx();
		aes_p8_encrypt(src, dst, &ctx->enc_key);
		disable_kernel_vsx();
		pagefault_enable();
		preempt_enable();
	}
}

static void p8_aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);

	if (in_interrupt()) {
		crypto_cipher_decrypt_one(ctx->fallback, dst, src);
	} else {
		preempt_disable();
		pagefault_disable();
		enable_kernel_vsx();
		aes_p8_decrypt(src, dst, &ctx->dec_key);
		disable_kernel_vsx();
		pagefault_enable();
		preempt_enable();
	}
}

struct crypto_alg p8_aes_alg = {
	.cra_name = "aes",
	.cra_driver_name = "p8_aes",
	.cra_module = THIS_MODULE,
	.cra_priority = 1000,
	.cra_type = NULL,
	.cra_flags = CRYPTO_ALG_TYPE_CIPHER | CRYPTO_ALG_NEED_FALLBACK,
	.cra_alignmask = 0,
	.cra_blocksize = AES_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct p8_aes_ctx),
	.cra_init = p8_aes_init,
	.cra_exit = p8_aes_exit,
	.cra_cipher = {
		       .cia_min_keysize = AES_MIN_KEY_SIZE,
		       .cia_max_keysize = AES_MAX_KEY_SIZE,
		       .cia_setkey = p8_aes_setkey,
		       .cia_encrypt = p8_aes_encrypt,
		       .cia_decrypt = p8_aes_decrypt,
	},
};
Commit	Line	Data
8676590a MC	1	/**
	2	* AES routines supporting VMX instructions on the Power 8
	3	*
	4	* Copyright (C) 2015 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: Marcelo Henrique Cerri <mhcerri@br.ibm.com>
	20	*/
	21
	22	#include <linux/types.h>
	23	#include <linux/err.h>
	24	#include <linux/crypto.h>
	25	#include <linux/delay.h>
	26	#include <linux/hardirq.h>
	27	#include <asm/switch_to.h>
	28	#include <crypto/aes.h>
	29
	30	#include "aesp8-ppc.h"
	31
	32	struct p8_aes_ctx {
4beb1060 HX	33	struct crypto_cipher *fallback;
	34	struct aes_key enc_key;
	35	struct aes_key dec_key;
8676590a MC	36	};
	37
	38	static int p8_aes_init(struct crypto_tfm *tfm)
	39	{
4beb1060 HX	40	const char *alg;
	41	struct crypto_cipher *fallback;
	42	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
	43
	44	if (!(alg = crypto_tfm_alg_name(tfm))) {
	45	printk(KERN_ERR "Failed to get algorithm name.\n");
	46	return -ENOENT;
	47	}
	48
	49	fallback = crypto_alloc_cipher(alg, 0, CRYPTO_ALG_NEED_FALLBACK);
	50	if (IS_ERR(fallback)) {
	51	printk(KERN_ERR
	52	"Failed to allocate transformation for '%s': %ld\n",
	53	alg, PTR_ERR(fallback));
	54	return PTR_ERR(fallback);
	55	}
	56	printk(KERN_INFO "Using '%s' as fallback implementation.\n",
	57	crypto_tfm_alg_driver_name((struct crypto_tfm *) fallback));
	58
	59	crypto_cipher_set_flags(fallback,
	60	crypto_cipher_get_flags((struct
	61	crypto_cipher *)
	62	tfm));
	63	ctx->fallback = fallback;
	64
	65	return 0;
8676590a MC	66	}
	67
	68	static void p8_aes_exit(struct crypto_tfm *tfm)
	69	{
4beb1060	70	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
8676590a	71
4beb1060 HX	72	if (ctx->fallback) {
	73	crypto_free_cipher(ctx->fallback);
	74	ctx->fallback = NULL;
	75	}
8676590a MC	76	}
	77
	78	static int p8_aes_setkey(struct crypto_tfm tfm, const u8 key,
4beb1060	79	unsigned int keylen)
8676590a	80	{
4beb1060 HX	81	int ret;
	82	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
	83
44d21c3f	84	preempt_disable();
4beb1060	85	pagefault_disable();
2d6f0600	86	enable_kernel_vsx();
4beb1060 HX	87	ret = aes_p8_set_encrypt_key(key, keylen * 8, &ctx->enc_key);
4beb1060 HX	88	ret += aes_p8_set_decrypt_key(key, keylen * 8, &ctx->dec_key);
dc4fbba1	89	disable_kernel_vsx();
4beb1060	90	pagefault_enable();
44d21c3f	91	preempt_enable();
4beb1060 HX	92
	93	ret += crypto_cipher_setkey(ctx->fallback, key, keylen);
	94	return ret;
8676590a MC	95	}
	96
	97	static void p8_aes_encrypt(struct crypto_tfm tfm, u8 dst, const u8 *src)
	98	{
4beb1060 HX	99	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
	100
	101	if (in_interrupt()) {
	102	crypto_cipher_encrypt_one(ctx->fallback, dst, src);
	103	} else {
44d21c3f	104	preempt_disable();
4beb1060	105	pagefault_disable();
2d6f0600	106	enable_kernel_vsx();
4beb1060	107	aes_p8_encrypt(src, dst, &ctx->enc_key);
dc4fbba1	108	disable_kernel_vsx();
4beb1060	109	pagefault_enable();
44d21c3f	110	preempt_enable();
4beb1060	111	}
8676590a MC	112	}
	113
	114	static void p8_aes_decrypt(struct crypto_tfm tfm, u8 dst, const u8 *src)
	115	{
4beb1060 HX	116	struct p8_aes_ctx *ctx = crypto_tfm_ctx(tfm);
	117
	118	if (in_interrupt()) {
	119	crypto_cipher_decrypt_one(ctx->fallback, dst, src);
	120	} else {
44d21c3f	121	preempt_disable();
4beb1060	122	pagefault_disable();
2d6f0600	123	enable_kernel_vsx();
4beb1060	124	aes_p8_decrypt(src, dst, &ctx->dec_key);
dc4fbba1	125	disable_kernel_vsx();
4beb1060	126	pagefault_enable();
44d21c3f	127	preempt_enable();
4beb1060	128	}
8676590a MC	129	}
	130
	131	struct crypto_alg p8_aes_alg = {
4beb1060 HX	132	.cra_name = "aes",
	133	.cra_driver_name = "p8_aes",
	134	.cra_module = THIS_MODULE,
	135	.cra_priority = 1000,
	136	.cra_type = NULL,
	137	.cra_flags = CRYPTO_ALG_TYPE_CIPHER \| CRYPTO_ALG_NEED_FALLBACK,
	138	.cra_alignmask = 0,
	139	.cra_blocksize = AES_BLOCK_SIZE,
	140	.cra_ctxsize = sizeof(struct p8_aes_ctx),
	141	.cra_init = p8_aes_init,
	142	.cra_exit = p8_aes_exit,
	143	.cra_cipher = {
	144	.cia_min_keysize = AES_MIN_KEY_SIZE,
	145	.cia_max_keysize = AES_MAX_KEY_SIZE,
	146	.cia_setkey = p8_aes_setkey,
	147	.cia_encrypt = p8_aes_encrypt,
	148	.cia_decrypt = p8_aes_decrypt,
	149	},
8676590a	150	};