[mirror_ubuntu-zesty-kernel.git] / arch / arm64 / crypto / aes-glue.c

/*
 * linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 AES
 *
 * Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <asm/neon.h>
#include <asm/hwcap.h>
#include <crypto/aes.h>
#include <crypto/ablk_helper.h>
#include <crypto/algapi.h>
#include <linux/module.h>
#include <linux/cpufeature.h>
#include <crypto/xts.h>

#include "aes-ce-setkey.h"

#ifdef USE_V8_CRYPTO_EXTENSIONS
#define MODE			"ce"
#define PRIO			300
#define aes_setkey		ce_aes_setkey
#define aes_expandkey		ce_aes_expandkey
#define aes_ecb_encrypt		ce_aes_ecb_encrypt
#define aes_ecb_decrypt		ce_aes_ecb_decrypt
#define aes_cbc_encrypt		ce_aes_cbc_encrypt
#define aes_cbc_decrypt		ce_aes_cbc_decrypt
#define aes_ctr_encrypt		ce_aes_ctr_encrypt
#define aes_xts_encrypt		ce_aes_xts_encrypt
#define aes_xts_decrypt		ce_aes_xts_decrypt
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
#else
#define MODE			"neon"
#define PRIO			200
#define aes_setkey		crypto_aes_set_key
#define aes_expandkey		crypto_aes_expand_key
#define aes_ecb_encrypt		neon_aes_ecb_encrypt
#define aes_ecb_decrypt		neon_aes_ecb_decrypt
#define aes_cbc_encrypt		neon_aes_cbc_encrypt
#define aes_cbc_decrypt		neon_aes_cbc_decrypt
#define aes_ctr_encrypt		neon_aes_ctr_encrypt
#define aes_xts_encrypt		neon_aes_xts_encrypt
#define aes_xts_decrypt		neon_aes_xts_decrypt
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON");
MODULE_ALIAS_CRYPTO("ecb(aes)");
MODULE_ALIAS_CRYPTO("cbc(aes)");
MODULE_ALIAS_CRYPTO("ctr(aes)");
MODULE_ALIAS_CRYPTO("xts(aes)");
#endif

MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
MODULE_LICENSE("GPL v2");

/* defined in aes-modes.S */
asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, int first);
asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, int first);

asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, u8 iv[], int first);
asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, u8 iv[], int first);

asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
				int rounds, int blocks, u8 ctr[], int first);

asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[],
				int rounds, int blocks, u8 const rk2[], u8 iv[],
				int first);
asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[],
				int rounds, int blocks, u8 const rk2[], u8 iv[],
				int first);

struct crypto_aes_xts_ctx {
	struct crypto_aes_ctx key1;
	struct crypto_aes_ctx __aligned(8) key2;
};

static int xts_set_key(struct crypto_tfm *tfm, const u8 *in_key,
		       unsigned int key_len)
{
	struct crypto_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);
	int ret;

	ret = xts_check_key(tfm, in_key, key_len);
	if (ret)
		return ret;

	ret = aes_expandkey(&ctx->key1, in_key, key_len / 2);
	if (!ret)
		ret = aes_expandkey(&ctx->key2, &in_key[key_len / 2],
				    key_len / 2);
	if (!ret)
		return 0;

	tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
	return -EINVAL;
}

static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct blkcipher_walk walk;
	unsigned int blocks;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_enc, rounds, blocks, first);
		err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
}

static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct blkcipher_walk walk;
	unsigned int blocks;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_dec, rounds, blocks, first);
		err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
}

static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct blkcipher_walk walk;
	unsigned int blocks;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_enc, rounds, blocks, walk.iv,
				first);
		err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
}

static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct blkcipher_walk walk;
	unsigned int blocks;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_dec, rounds, blocks, walk.iv,
				first);
		err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
}

static int ctr_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct blkcipher_walk walk;
	int blocks;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);

	first = 1;
	kernel_neon_begin();
	while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
		aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key_enc, rounds, blocks, walk.iv,
				first);
		first = 0;
		nbytes -= blocks * AES_BLOCK_SIZE;
		if (nbytes && nbytes == walk.nbytes % AES_BLOCK_SIZE)
			break;
		err = blkcipher_walk_done(desc, &walk,
					  walk.nbytes % AES_BLOCK_SIZE);
	}
	if (walk.nbytes % AES_BLOCK_SIZE) {
		u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
		u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
		u8 __aligned(8) tail[AES_BLOCK_SIZE];

		/*
		 * Minimum alignment is 8 bytes, so if nbytes is <= 8, we need
		 * to tell aes_ctr_encrypt() to only read half a block.
		 */
		blocks = (nbytes <= 8) ? -1 : 1;

		aes_ctr_encrypt(tail, tsrc, (u8 *)ctx->key_enc, rounds,
				blocks, walk.iv, first);
		memcpy(tdst, tail, nbytes);
		err = blkcipher_walk_done(desc, &walk, 0);
	}
	kernel_neon_end();

	return err;
}

static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	int err, first, rounds = 6 + ctx->key1.key_length / 4;
	struct blkcipher_walk walk;
	unsigned int blocks;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key1.key_enc, rounds, blocks,
				(u8 *)ctx->key2.key_enc, walk.iv, first);
		err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();

	return err;
}

static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
		       struct scatterlist *src, unsigned int nbytes)
{
	struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	int err, first, rounds = 6 + ctx->key1.key_length / 4;
	struct blkcipher_walk walk;
	unsigned int blocks;

	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	blkcipher_walk_init(&walk, dst, src, nbytes);
	err = blkcipher_walk_virt(desc, &walk);

	kernel_neon_begin();
	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
		aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
				(u8 *)ctx->key1.key_dec, rounds, blocks,
				(u8 *)ctx->key2.key_enc, walk.iv, first);
		err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();

	return err;
}

static struct crypto_alg aes_algs[] = { {
	.cra_name		= "__ecb-aes-" MODE,
	.cra_driver_name	= "__driver-ecb-aes-" MODE,
	.cra_priority		= 0,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
				  CRYPTO_ALG_INTERNAL,
	.cra_blocksize		= AES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_blkcipher = {
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
		.ivsize		= 0,
		.setkey		= aes_setkey,
		.encrypt	= ecb_encrypt,
		.decrypt	= ecb_decrypt,
	},
}, {
	.cra_name		= "__cbc-aes-" MODE,
	.cra_driver_name	= "__driver-cbc-aes-" MODE,
	.cra_priority		= 0,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
				  CRYPTO_ALG_INTERNAL,
	.cra_blocksize		= AES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_blkcipher = {
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.setkey		= aes_setkey,
		.encrypt	= cbc_encrypt,
		.decrypt	= cbc_decrypt,
	},
}, {
	.cra_name		= "__ctr-aes-" MODE,
	.cra_driver_name	= "__driver-ctr-aes-" MODE,
	.cra_priority		= 0,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
				  CRYPTO_ALG_INTERNAL,
	.cra_blocksize		= 1,
	.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_blkcipher = {
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.setkey		= aes_setkey,
		.encrypt	= ctr_encrypt,
		.decrypt	= ctr_encrypt,
	},
}, {
	.cra_name		= "__xts-aes-" MODE,
	.cra_driver_name	= "__driver-xts-aes-" MODE,
	.cra_priority		= 0,
	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER |
				  CRYPTO_ALG_INTERNAL,
	.cra_blocksize		= AES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct crypto_aes_xts_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_blkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_blkcipher = {
		.min_keysize	= 2 * AES_MIN_KEY_SIZE,
		.max_keysize	= 2 * AES_MAX_KEY_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.setkey		= xts_set_key,
		.encrypt	= xts_encrypt,
		.decrypt	= xts_decrypt,
	},
}, {
	.cra_name		= "ecb(aes)",
	.cra_driver_name	= "ecb-aes-" MODE,
	.cra_priority		= PRIO,
	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
	.cra_blocksize		= AES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct async_helper_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_ablkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_init		= ablk_init,
	.cra_exit		= ablk_exit,
	.cra_ablkcipher = {
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
		.ivsize		= 0,
		.setkey		= ablk_set_key,
		.encrypt	= ablk_encrypt,
		.decrypt	= ablk_decrypt,
	}
}, {
	.cra_name		= "cbc(aes)",
	.cra_driver_name	= "cbc-aes-" MODE,
	.cra_priority		= PRIO,
	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
	.cra_blocksize		= AES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct async_helper_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_ablkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_init		= ablk_init,
	.cra_exit		= ablk_exit,
	.cra_ablkcipher = {
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.setkey		= ablk_set_key,
		.encrypt	= ablk_encrypt,
		.decrypt	= ablk_decrypt,
	}
}, {
	.cra_name		= "ctr(aes)",
	.cra_driver_name	= "ctr-aes-" MODE,
	.cra_priority		= PRIO,
	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
	.cra_blocksize		= 1,
	.cra_ctxsize		= sizeof(struct async_helper_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_ablkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_init		= ablk_init,
	.cra_exit		= ablk_exit,
	.cra_ablkcipher = {
		.min_keysize	= AES_MIN_KEY_SIZE,
		.max_keysize	= AES_MAX_KEY_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.setkey		= ablk_set_key,
		.encrypt	= ablk_encrypt,
		.decrypt	= ablk_decrypt,
	}
}, {
	.cra_name		= "xts(aes)",
	.cra_driver_name	= "xts-aes-" MODE,
	.cra_priority		= PRIO,
	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER|CRYPTO_ALG_ASYNC,
	.cra_blocksize		= AES_BLOCK_SIZE,
	.cra_ctxsize		= sizeof(struct async_helper_ctx),
	.cra_alignmask		= 7,
	.cra_type		= &crypto_ablkcipher_type,
	.cra_module		= THIS_MODULE,
	.cra_init		= ablk_init,
	.cra_exit		= ablk_exit,
	.cra_ablkcipher = {
		.min_keysize	= 2 * AES_MIN_KEY_SIZE,
		.max_keysize	= 2 * AES_MAX_KEY_SIZE,
		.ivsize		= AES_BLOCK_SIZE,
		.setkey		= ablk_set_key,
		.encrypt	= ablk_encrypt,
		.decrypt	= ablk_decrypt,
	}
} };

static int __init aes_init(void)
{
	return crypto_register_algs(aes_algs, ARRAY_SIZE(aes_algs));
}

static void __exit aes_exit(void)
{
	crypto_unregister_algs(aes_algs, ARRAY_SIZE(aes_algs));
}

#ifdef USE_V8_CRYPTO_EXTENSIONS
module_cpu_feature_match(AES, aes_init);
#else
module_init(aes_init);
#endif
module_exit(aes_exit);
Commit	Line	Data
49788fe2 AB	1	/*
	2	* linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 AES
	3	*
	4	* Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
	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 version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
	11	#include <asm/neon.h>
	12	#include <asm/hwcap.h>
	13	#include <crypto/aes.h>
	14	#include <crypto/ablk_helper.h>
	15	#include <crypto/algapi.h>
	16	#include <linux/module.h>
	17	#include <linux/cpufeature.h>
49abc0d2	18	#include <crypto/xts.h>
49788fe2	19
12ac3efe AB	20	#include "aes-ce-setkey.h"
12ac3efe AB	21
49788fe2 AB	22	#ifdef USE_V8_CRYPTO_EXTENSIONS
	23	#define MODE "ce"
	24	#define PRIO 300
12ac3efe AB	25	#define aes_setkey ce_aes_setkey
12ac3efe AB	26	#define aes_expandkey ce_aes_expandkey
49788fe2 AB	27	#define aes_ecb_encrypt ce_aes_ecb_encrypt
	28	#define aes_ecb_decrypt ce_aes_ecb_decrypt
	29	#define aes_cbc_encrypt ce_aes_cbc_encrypt
	30	#define aes_cbc_decrypt ce_aes_cbc_decrypt
	31	#define aes_ctr_encrypt ce_aes_ctr_encrypt
	32	#define aes_xts_encrypt ce_aes_xts_encrypt
	33	#define aes_xts_decrypt ce_aes_xts_decrypt
	34	MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 Crypto Extensions");
	35	#else
	36	#define MODE "neon"
	37	#define PRIO 200
12ac3efe AB	38	#define aes_setkey crypto_aes_set_key
12ac3efe AB	39	#define aes_expandkey crypto_aes_expand_key
49788fe2 AB	40	#define aes_ecb_encrypt neon_aes_ecb_encrypt
	41	#define aes_ecb_decrypt neon_aes_ecb_decrypt
	42	#define aes_cbc_encrypt neon_aes_cbc_encrypt
	43	#define aes_cbc_decrypt neon_aes_cbc_decrypt
	44	#define aes_ctr_encrypt neon_aes_ctr_encrypt
	45	#define aes_xts_encrypt neon_aes_xts_encrypt
	46	#define aes_xts_decrypt neon_aes_xts_decrypt
	47	MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS using ARMv8 NEON");
5d26a105 KC	48	MODULE_ALIAS_CRYPTO("ecb(aes)");
	49	MODULE_ALIAS_CRYPTO("cbc(aes)");
	50	MODULE_ALIAS_CRYPTO("ctr(aes)");
	51	MODULE_ALIAS_CRYPTO("xts(aes)");
49788fe2 AB	52	#endif
	53
	54	MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
	55	MODULE_LICENSE("GPL v2");
	56
	57	/* defined in aes-modes.S */
	58	asmlinkage void aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],
	59	int rounds, int blocks, int first);
	60	asmlinkage void aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[],
	61	int rounds, int blocks, int first);
	62
	63	asmlinkage void aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[],
	64	int rounds, int blocks, u8 iv[], int first);
	65	asmlinkage void aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[],
	66	int rounds, int blocks, u8 iv[], int first);
	67
	68	asmlinkage void aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[],
	69	int rounds, int blocks, u8 ctr[], int first);
	70
	71	asmlinkage void aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[],
	72	int rounds, int blocks, u8 const rk2[], u8 iv[],
	73	int first);
	74	asmlinkage void aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[],
	75	int rounds, int blocks, u8 const rk2[], u8 iv[],
	76	int first);
	77
	78	struct crypto_aes_xts_ctx {
	79	struct crypto_aes_ctx key1;
	80	struct crypto_aes_ctx __aligned(8) key2;
	81	};
	82
	83	static int xts_set_key(struct crypto_tfm tfm, const u8 in_key,
	84	unsigned int key_len)
	85	{
	86	struct crypto_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);
	87	int ret;
	88
28856a9e SM	89	ret = xts_check_key(tfm, in_key, key_len);
	90	if (ret)
	91	return ret;
	92
12ac3efe	93	ret = aes_expandkey(&ctx->key1, in_key, key_len / 2);
49788fe2	94	if (!ret)
12ac3efe AB	95	ret = aes_expandkey(&ctx->key2, &in_key[key_len / 2],
12ac3efe AB	96	key_len / 2);
49788fe2 AB	97	if (!ret)
	98	return 0;
	99
	100	tfm->crt_flags \|= CRYPTO_TFM_RES_BAD_KEY_LEN;
	101	return -EINVAL;
	102	}
	103
	104	static int ecb_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	105	struct scatterlist *src, unsigned int nbytes)
	106	{
	107	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	108	int err, first, rounds = 6 + ctx->key_length / 4;
	109	struct blkcipher_walk walk;
	110	unsigned int blocks;
	111
	112	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	113	blkcipher_walk_init(&walk, dst, src, nbytes);
	114	err = blkcipher_walk_virt(desc, &walk);
	115
	116	kernel_neon_begin();
	117	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
	118	aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
	119	(u8 *)ctx->key_enc, rounds, blocks, first);
f960d209	120	err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
49788fe2 AB	121	}
	122	kernel_neon_end();
	123	return err;
	124	}
	125
	126	static int ecb_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	127	struct scatterlist *src, unsigned int nbytes)
	128	{
	129	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	130	int err, first, rounds = 6 + ctx->key_length / 4;
	131	struct blkcipher_walk walk;
	132	unsigned int blocks;
	133
	134	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	135	blkcipher_walk_init(&walk, dst, src, nbytes);
	136	err = blkcipher_walk_virt(desc, &walk);
	137
	138	kernel_neon_begin();
	139	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
	140	aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
	141	(u8 *)ctx->key_dec, rounds, blocks, first);
f960d209	142	err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
49788fe2 AB	143	}
	144	kernel_neon_end();
	145	return err;
	146	}
	147
	148	static int cbc_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	149	struct scatterlist *src, unsigned int nbytes)
	150	{
	151	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	152	int err, first, rounds = 6 + ctx->key_length / 4;
	153	struct blkcipher_walk walk;
	154	unsigned int blocks;
	155
	156	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	157	blkcipher_walk_init(&walk, dst, src, nbytes);
	158	err = blkcipher_walk_virt(desc, &walk);
	159
	160	kernel_neon_begin();
	161	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
	162	aes_cbc_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
	163	(u8 *)ctx->key_enc, rounds, blocks, walk.iv,
	164	first);
f960d209	165	err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
49788fe2 AB	166	}
	167	kernel_neon_end();
	168	return err;
	169	}
	170
	171	static int cbc_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	172	struct scatterlist *src, unsigned int nbytes)
	173	{
	174	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	175	int err, first, rounds = 6 + ctx->key_length / 4;
	176	struct blkcipher_walk walk;
	177	unsigned int blocks;
	178
	179	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	180	blkcipher_walk_init(&walk, dst, src, nbytes);
	181	err = blkcipher_walk_virt(desc, &walk);
	182
	183	kernel_neon_begin();
	184	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
	185	aes_cbc_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
	186	(u8 *)ctx->key_dec, rounds, blocks, walk.iv,
	187	first);
f960d209	188	err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
49788fe2 AB	189	}
	190	kernel_neon_end();
	191	return err;
	192	}
	193
	194	static int ctr_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	195	struct scatterlist *src, unsigned int nbytes)
	196	{
	197	struct crypto_aes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	198	int err, first, rounds = 6 + ctx->key_length / 4;
	199	struct blkcipher_walk walk;
	200	int blocks;
	201
	202	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	203	blkcipher_walk_init(&walk, dst, src, nbytes);
	204	err = blkcipher_walk_virt_block(desc, &walk, AES_BLOCK_SIZE);
	205
	206	first = 1;
	207	kernel_neon_begin();
	208	while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
	209	aes_ctr_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
	210	(u8 *)ctx->key_enc, rounds, blocks, walk.iv,
	211	first);
	212	first = 0;
	213	nbytes -= blocks * AES_BLOCK_SIZE;
	214	if (nbytes && nbytes == walk.nbytes % AES_BLOCK_SIZE)
	215	break;
	216	err = blkcipher_walk_done(desc, &walk,
	217	walk.nbytes % AES_BLOCK_SIZE);
	218	}
2db34e78	219	if (walk.nbytes % AES_BLOCK_SIZE) {
49788fe2 AB	220	u8 tdst = walk.dst.virt.addr + blocks AES_BLOCK_SIZE;
	221	u8 tsrc = walk.src.virt.addr + blocks AES_BLOCK_SIZE;
	222	u8 __aligned(8) tail[AES_BLOCK_SIZE];
	223
	224	/*
	225	* Minimum alignment is 8 bytes, so if nbytes is <= 8, we need
	226	* to tell aes_ctr_encrypt() to only read half a block.
	227	*/
	228	blocks = (nbytes <= 8) ? -1 : 1;
	229
	230	aes_ctr_encrypt(tail, tsrc, (u8 *)ctx->key_enc, rounds,
	231	blocks, walk.iv, first);
	232	memcpy(tdst, tail, nbytes);
	233	err = blkcipher_walk_done(desc, &walk, 0);
	234	}
	235	kernel_neon_end();
	236
	237	return err;
	238	}
	239
	240	static int xts_encrypt(struct blkcipher_desc desc, struct scatterlist dst,
	241	struct scatterlist *src, unsigned int nbytes)
	242	{
	243	struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	244	int err, first, rounds = 6 + ctx->key1.key_length / 4;
	245	struct blkcipher_walk walk;
	246	unsigned int blocks;
	247
	248	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	249	blkcipher_walk_init(&walk, dst, src, nbytes);
	250	err = blkcipher_walk_virt(desc, &walk);
	251
	252	kernel_neon_begin();
	253	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
	254	aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
	255	(u8 *)ctx->key1.key_enc, rounds, blocks,
	256	(u8 *)ctx->key2.key_enc, walk.iv, first);
f960d209	257	err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
49788fe2 AB	258	}
	259	kernel_neon_end();
	260
	261	return err;
	262	}
	263
	264	static int xts_decrypt(struct blkcipher_desc desc, struct scatterlist dst,
	265	struct scatterlist *src, unsigned int nbytes)
	266	{
	267	struct crypto_aes_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
	268	int err, first, rounds = 6 + ctx->key1.key_length / 4;
	269	struct blkcipher_walk walk;
	270	unsigned int blocks;
	271
	272	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
	273	blkcipher_walk_init(&walk, dst, src, nbytes);
	274	err = blkcipher_walk_virt(desc, &walk);
	275
	276	kernel_neon_begin();
	277	for (first = 1; (blocks = (walk.nbytes / AES_BLOCK_SIZE)); first = 0) {
	278	aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
	279	(u8 *)ctx->key1.key_dec, rounds, blocks,
	280	(u8 *)ctx->key2.key_enc, walk.iv, first);
f960d209	281	err = blkcipher_walk_done(desc, &walk, walk.nbytes % AES_BLOCK_SIZE);
49788fe2 AB	282	}
	283	kernel_neon_end();
	284
	285	return err;
	286	}
	287
	288	static struct crypto_alg aes_algs[] = { {
	289	.cra_name = "__ecb-aes-" MODE,
	290	.cra_driver_name = "__driver-ecb-aes-" MODE,
	291	.cra_priority = 0,
cd98411c SM	292	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
cd98411c SM	293	CRYPTO_ALG_INTERNAL,
49788fe2 AB	294	.cra_blocksize = AES_BLOCK_SIZE,
	295	.cra_ctxsize = sizeof(struct crypto_aes_ctx),
	296	.cra_alignmask = 7,
	297	.cra_type = &crypto_blkcipher_type,
	298	.cra_module = THIS_MODULE,
	299	.cra_blkcipher = {
	300	.min_keysize = AES_MIN_KEY_SIZE,
	301	.max_keysize = AES_MAX_KEY_SIZE,
bee038a4	302	.ivsize = 0,
12ac3efe	303	.setkey = aes_setkey,
49788fe2 AB	304	.encrypt = ecb_encrypt,
	305	.decrypt = ecb_decrypt,
	306	},
	307	}, {
	308	.cra_name = "__cbc-aes-" MODE,
	309	.cra_driver_name = "__driver-cbc-aes-" MODE,
	310	.cra_priority = 0,
cd98411c SM	311	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
cd98411c SM	312	CRYPTO_ALG_INTERNAL,
49788fe2 AB	313	.cra_blocksize = AES_BLOCK_SIZE,
	314	.cra_ctxsize = sizeof(struct crypto_aes_ctx),
	315	.cra_alignmask = 7,
	316	.cra_type = &crypto_blkcipher_type,
	317	.cra_module = THIS_MODULE,
	318	.cra_blkcipher = {
	319	.min_keysize = AES_MIN_KEY_SIZE,
	320	.max_keysize = AES_MAX_KEY_SIZE,
	321	.ivsize = AES_BLOCK_SIZE,
12ac3efe	322	.setkey = aes_setkey,
49788fe2 AB	323	.encrypt = cbc_encrypt,
	324	.decrypt = cbc_decrypt,
	325	},
	326	}, {
	327	.cra_name = "__ctr-aes-" MODE,
	328	.cra_driver_name = "__driver-ctr-aes-" MODE,
	329	.cra_priority = 0,
cd98411c SM	330	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
cd98411c SM	331	CRYPTO_ALG_INTERNAL,
49788fe2 AB	332	.cra_blocksize = 1,
	333	.cra_ctxsize = sizeof(struct crypto_aes_ctx),
	334	.cra_alignmask = 7,
	335	.cra_type = &crypto_blkcipher_type,
	336	.cra_module = THIS_MODULE,
	337	.cra_blkcipher = {
	338	.min_keysize = AES_MIN_KEY_SIZE,
	339	.max_keysize = AES_MAX_KEY_SIZE,
	340	.ivsize = AES_BLOCK_SIZE,
12ac3efe	341	.setkey = aes_setkey,
49788fe2 AB	342	.encrypt = ctr_encrypt,
	343	.decrypt = ctr_encrypt,
	344	},
	345	}, {
	346	.cra_name = "__xts-aes-" MODE,
	347	.cra_driver_name = "__driver-xts-aes-" MODE,
	348	.cra_priority = 0,
cd98411c SM	349	.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER \|
cd98411c SM	350	CRYPTO_ALG_INTERNAL,
49788fe2 AB	351	.cra_blocksize = AES_BLOCK_SIZE,
	352	.cra_ctxsize = sizeof(struct crypto_aes_xts_ctx),
	353	.cra_alignmask = 7,
	354	.cra_type = &crypto_blkcipher_type,
	355	.cra_module = THIS_MODULE,
	356	.cra_blkcipher = {
	357	.min_keysize = 2 * AES_MIN_KEY_SIZE,
	358	.max_keysize = 2 * AES_MAX_KEY_SIZE,
	359	.ivsize = AES_BLOCK_SIZE,
	360	.setkey = xts_set_key,
	361	.encrypt = xts_encrypt,
	362	.decrypt = xts_decrypt,
	363	},
	364	}, {
	365	.cra_name = "ecb(aes)",
	366	.cra_driver_name = "ecb-aes-" MODE,
	367	.cra_priority = PRIO,
	368	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER\|CRYPTO_ALG_ASYNC,
	369	.cra_blocksize = AES_BLOCK_SIZE,
	370	.cra_ctxsize = sizeof(struct async_helper_ctx),
	371	.cra_alignmask = 7,
	372	.cra_type = &crypto_ablkcipher_type,
	373	.cra_module = THIS_MODULE,
	374	.cra_init = ablk_init,
	375	.cra_exit = ablk_exit,
	376	.cra_ablkcipher = {
	377	.min_keysize = AES_MIN_KEY_SIZE,
	378	.max_keysize = AES_MAX_KEY_SIZE,
bee038a4	379	.ivsize = 0,
49788fe2 AB	380	.setkey = ablk_set_key,
	381	.encrypt = ablk_encrypt,
	382	.decrypt = ablk_decrypt,
	383	}
	384	}, {
	385	.cra_name = "cbc(aes)",
	386	.cra_driver_name = "cbc-aes-" MODE,
	387	.cra_priority = PRIO,
	388	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER\|CRYPTO_ALG_ASYNC,
	389	.cra_blocksize = AES_BLOCK_SIZE,
	390	.cra_ctxsize = sizeof(struct async_helper_ctx),
	391	.cra_alignmask = 7,
	392	.cra_type = &crypto_ablkcipher_type,
	393	.cra_module = THIS_MODULE,
	394	.cra_init = ablk_init,
	395	.cra_exit = ablk_exit,
	396	.cra_ablkcipher = {
	397	.min_keysize = AES_MIN_KEY_SIZE,
	398	.max_keysize = AES_MAX_KEY_SIZE,
	399	.ivsize = AES_BLOCK_SIZE,
	400	.setkey = ablk_set_key,
	401	.encrypt = ablk_encrypt,
	402	.decrypt = ablk_decrypt,
	403	}
	404	}, {
	405	.cra_name = "ctr(aes)",
	406	.cra_driver_name = "ctr-aes-" MODE,
	407	.cra_priority = PRIO,
	408	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER\|CRYPTO_ALG_ASYNC,
	409	.cra_blocksize = 1,
	410	.cra_ctxsize = sizeof(struct async_helper_ctx),
	411	.cra_alignmask = 7,
	412	.cra_type = &crypto_ablkcipher_type,
	413	.cra_module = THIS_MODULE,
	414	.cra_init = ablk_init,
	415	.cra_exit = ablk_exit,
	416	.cra_ablkcipher = {
	417	.min_keysize = AES_MIN_KEY_SIZE,
	418	.max_keysize = AES_MAX_KEY_SIZE,
	419	.ivsize = AES_BLOCK_SIZE,
	420	.setkey = ablk_set_key,
	421	.encrypt = ablk_encrypt,
	422	.decrypt = ablk_decrypt,
	423	}
	424	}, {
	425	.cra_name = "xts(aes)",
	426	.cra_driver_name = "xts-aes-" MODE,
	427	.cra_priority = PRIO,
	428	.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER\|CRYPTO_ALG_ASYNC,
	429	.cra_blocksize = AES_BLOCK_SIZE,
	430	.cra_ctxsize = sizeof(struct async_helper_ctx),
	431	.cra_alignmask = 7,
	432	.cra_type = &crypto_ablkcipher_type,
	433	.cra_module = THIS_MODULE,
	434	.cra_init = ablk_init,
	435	.cra_exit = ablk_exit,
	436	.cra_ablkcipher = {
	437	.min_keysize = 2 * AES_MIN_KEY_SIZE,
	438	.max_keysize = 2 * AES_MAX_KEY_SIZE,
	439	.ivsize = AES_BLOCK_SIZE,
	440	.setkey = ablk_set_key,
	441	.encrypt = ablk_encrypt,
	442	.decrypt = ablk_decrypt,
	443	}
444	} };
445
446	static int __init aes_init(void)
447	{
448	return crypto_register_algs(aes_algs, ARRAY_SIZE(aes_algs));
449	}
450
451	static void __exit aes_exit(void)
452	{
453	crypto_unregister_algs(aes_algs, ARRAY_SIZE(aes_algs));
454	}
455
456	#ifdef USE_V8_CRYPTO_EXTENSIONS
457	module_cpu_feature_match(AES, aes_init);
458	#else
459	module_init(aes_init);
460	#endif
461	module_exit(aes_exit);