arch/arm64/crypto/aes-glue.c - kernel/msm-4.19 - Gitiles

 /*
  * 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/internal/simd.h>
 #include <crypto/internal/skcipher.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 skcipher_aes_setkey(struct crypto_skcipher *tfm, const u8 *in_key,
 			       unsigned int key_len)
 {
 	return aes_setkey(crypto_skcipher_tfm(tfm), in_key, key_len);
 }

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

 	ret = xts_verify_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;

 	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 	return -EINVAL;
 }

 static int ecb_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int err, first, rounds = 6 + ctx->key_length / 4;
 	struct skcipher_walk walk;
 	unsigned int blocks;

 	err = skcipher_walk_virt(&walk, req, true);

 	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 	}
 	kernel_neon_end();
 	return err;
 }

 static int ecb_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int err, first, rounds = 6 + ctx->key_length / 4;
 	struct skcipher_walk walk;
 	unsigned int blocks;

 	err = skcipher_walk_virt(&walk, req, true);

 	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 	}
 	kernel_neon_end();
 	return err;
 }

 static int cbc_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int err, first, rounds = 6 + ctx->key_length / 4;
 	struct skcipher_walk walk;
 	unsigned int blocks;

 	err = skcipher_walk_virt(&walk, req, true);

 	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 	}
 	kernel_neon_end();
 	return err;
 }

 static int cbc_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int err, first, rounds = 6 + ctx->key_length / 4;
 	struct skcipher_walk walk;
 	unsigned int blocks;

 	err = skcipher_walk_virt(&walk, req, true);

 	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 	}
 	kernel_neon_end();
 	return err;
 }

 static int ctr_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int err, first, rounds = 6 + ctx->key_length / 4;
 	struct skcipher_walk walk;
 	int blocks;

 	err = skcipher_walk_virt(&walk, req, true);

 	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);
 		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 		first = 0;
 	}
 	if (walk.nbytes) {
 		u8 __aligned(8) tail[AES_BLOCK_SIZE];
 		unsigned int nbytes = walk.nbytes;
 		u8 *tdst = walk.dst.virt.addr;
 		u8 *tsrc = walk.src.virt.addr;

 		/*
 		 * 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 = skcipher_walk_done(&walk, 0);
 	}
 	kernel_neon_end();

 	return err;
 }

 static int xts_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int err, first, rounds = 6 + ctx->key1.key_length / 4;
 	struct skcipher_walk walk;
 	unsigned int blocks;

 	err = skcipher_walk_virt(&walk, req, true);

 	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 	}
 	kernel_neon_end();

 	return err;
 }

 static int xts_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int err, first, rounds = 6 + ctx->key1.key_length / 4;
 	struct skcipher_walk walk;
 	unsigned int blocks;

 	err = skcipher_walk_virt(&walk, req, true);

 	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 	}
 	kernel_neon_end();

 	return err;
 }

 static struct skcipher_alg aes_algs[] = { {
 	.base = {
 		.cra_name		= "__ecb(aes)",
 		.cra_driver_name	= "__ecb-aes-" MODE,
 		.cra_priority		= PRIO,
 		.cra_flags		= CRYPTO_ALG_INTERNAL,
 		.cra_blocksize		= AES_BLOCK_SIZE,
 		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
 		.cra_alignmask		= 7,
 		.cra_module		= THIS_MODULE,
 	},
 	.min_keysize	= AES_MIN_KEY_SIZE,
 	.max_keysize	= AES_MAX_KEY_SIZE,
 	.setkey		= skcipher_aes_setkey,
 	.encrypt	= ecb_encrypt,
 	.decrypt	= ecb_decrypt,
 }, {
 	.base = {
 		.cra_name		= "__cbc(aes)",
 		.cra_driver_name	= "__cbc-aes-" MODE,
 		.cra_priority		= PRIO,
 		.cra_flags		= CRYPTO_ALG_INTERNAL,
 		.cra_blocksize		= AES_BLOCK_SIZE,
 		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
 		.cra_alignmask		= 7,
 		.cra_module		= THIS_MODULE,
 	},
 	.min_keysize	= AES_MIN_KEY_SIZE,
 	.max_keysize	= AES_MAX_KEY_SIZE,
 	.ivsize		= AES_BLOCK_SIZE,
 	.setkey		= skcipher_aes_setkey,
 	.encrypt	= cbc_encrypt,
 	.decrypt	= cbc_decrypt,
 }, {
 	.base = {
 		.cra_name		= "__ctr(aes)",
 		.cra_driver_name	= "__ctr-aes-" MODE,
 		.cra_priority		= PRIO,
 		.cra_flags		= CRYPTO_ALG_INTERNAL,
 		.cra_blocksize		= 1,
 		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
 		.cra_alignmask		= 7,
 		.cra_module		= THIS_MODULE,
 	},
 	.min_keysize	= AES_MIN_KEY_SIZE,
 	.max_keysize	= AES_MAX_KEY_SIZE,
 	.ivsize		= AES_BLOCK_SIZE,
 	.chunksize	= AES_BLOCK_SIZE,
 	.setkey		= skcipher_aes_setkey,
 	.encrypt	= ctr_encrypt,
 	.decrypt	= ctr_encrypt,
 }, {
 	.base = {
 		.cra_name		= "__xts(aes)",
 		.cra_driver_name	= "__xts-aes-" MODE,
 		.cra_priority		= PRIO,
 		.cra_flags		= CRYPTO_ALG_INTERNAL,
 		.cra_blocksize		= AES_BLOCK_SIZE,
 		.cra_ctxsize		= sizeof(struct crypto_aes_xts_ctx),
 		.cra_alignmask		= 7,
 		.cra_module		= THIS_MODULE,
 	},
 	.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,
 } };

 static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)];

 static void aes_exit(void)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(aes_simd_algs) && aes_simd_algs[i]; i++)
 		simd_skcipher_free(aes_simd_algs[i]);

 	crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
 }

 static int __init aes_init(void)
 {
 	struct simd_skcipher_alg *simd;
 	const char *basename;
 	const char *algname;
 	const char *drvname;
 	int err;
 	int i;

 	err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
 	if (err)
 		return err;

 	for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
 		algname = aes_algs[i].base.cra_name + 2;
 		drvname = aes_algs[i].base.cra_driver_name + 2;
 		basename = aes_algs[i].base.cra_driver_name;
 		simd = simd_skcipher_create_compat(algname, drvname, basename);
 		err = PTR_ERR(simd);
 		if (IS_ERR(simd))
 			goto unregister_simds;

 		aes_simd_algs[i] = simd;
 	}

 	return 0;

 unregister_simds:
 	aes_exit();
 	return err;
 }

 #ifdef USE_V8_CRYPTO_EXTENSIONS
 module_cpu_feature_match(AES, aes_init);
 #else
 module_init(aes_init);
 #endif
 module_exit(aes_exit);
	/*
	* 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/internal/simd.h>
	#include <crypto/internal/skcipher.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 skcipher_aes_setkey(struct crypto_skcipher tfm, const u8 in_key,
	unsigned int key_len)
	{
	return aes_setkey(crypto_skcipher_tfm(tfm), in_key, key_len);
	}

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

	ret = xts_verify_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;

	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	return -EINVAL;
	}

	static int ecb_encrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
	}

	static int ecb_decrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
	}

	static int cbc_encrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
	}

	static int cbc_decrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();
	return err;
	}

	static int ctr_encrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	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);
	err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	first = 0;
	}
	if (walk.nbytes) {
	u8 __aligned(8) tail[AES_BLOCK_SIZE];
	unsigned int nbytes = walk.nbytes;
	u8 *tdst = walk.dst.virt.addr;
	u8 *tsrc = walk.src.virt.addr;

	/*
	* 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 = skcipher_walk_done(&walk, 0);
	}
	kernel_neon_end();

	return err;
	}

	static int xts_encrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key1.key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();

	return err;
	}

	static int xts_decrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, first, rounds = 6 + ctx->key1.key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

	err = skcipher_walk_virt(&walk, req, true);

	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 = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	kernel_neon_end();

	return err;
	}

	static struct skcipher_alg aes_algs[] = { {
	.base = {
	.cra_name = "__ecb(aes)",
	.cra_driver_name = "__ecb-aes-" MODE,
	.cra_priority = PRIO,
	.cra_flags = CRYPTO_ALG_INTERNAL,
	.cra_blocksize = AES_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct crypto_aes_ctx),
	.cra_alignmask = 7,
	.cra_module = THIS_MODULE,
	},
	.min_keysize = AES_MIN_KEY_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE,
	.setkey = skcipher_aes_setkey,
	.encrypt = ecb_encrypt,
	.decrypt = ecb_decrypt,
	}, {
	.base = {
	.cra_name = "__cbc(aes)",
	.cra_driver_name = "__cbc-aes-" MODE,
	.cra_priority = PRIO,
	.cra_flags = CRYPTO_ALG_INTERNAL,
	.cra_blocksize = AES_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct crypto_aes_ctx),
	.cra_alignmask = 7,
	.cra_module = THIS_MODULE,
	},
	.min_keysize = AES_MIN_KEY_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE,
	.ivsize = AES_BLOCK_SIZE,
	.setkey = skcipher_aes_setkey,
	.encrypt = cbc_encrypt,
	.decrypt = cbc_decrypt,
	}, {
	.base = {
	.cra_name = "__ctr(aes)",
	.cra_driver_name = "__ctr-aes-" MODE,
	.cra_priority = PRIO,
	.cra_flags = CRYPTO_ALG_INTERNAL,
	.cra_blocksize = 1,
	.cra_ctxsize = sizeof(struct crypto_aes_ctx),
	.cra_alignmask = 7,
	.cra_module = THIS_MODULE,
	},
	.min_keysize = AES_MIN_KEY_SIZE,
	.max_keysize = AES_MAX_KEY_SIZE,
	.ivsize = AES_BLOCK_SIZE,
	.chunksize = AES_BLOCK_SIZE,
	.setkey = skcipher_aes_setkey,
	.encrypt = ctr_encrypt,
	.decrypt = ctr_encrypt,
	}, {
	.base = {
	.cra_name = "__xts(aes)",
	.cra_driver_name = "__xts-aes-" MODE,
	.cra_priority = PRIO,
	.cra_flags = CRYPTO_ALG_INTERNAL,
	.cra_blocksize = AES_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct crypto_aes_xts_ctx),
	.cra_alignmask = 7,
	.cra_module = THIS_MODULE,
	},
	.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,
	} };

	static struct simd_skcipher_alg *aes_simd_algs[ARRAY_SIZE(aes_algs)];

	static void aes_exit(void)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(aes_simd_algs) && aes_simd_algs[i]; i++)
	simd_skcipher_free(aes_simd_algs[i]);

	crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
	}

	static int __init aes_init(void)
	{
	struct simd_skcipher_alg *simd;
	const char *basename;
	const char *algname;
	const char *drvname;
	int err;
	int i;

	err = crypto_register_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
	if (err)
	return err;

	for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
	algname = aes_algs[i].base.cra_name + 2;
	drvname = aes_algs[i].base.cra_driver_name + 2;
	basename = aes_algs[i].base.cra_driver_name;
	simd = simd_skcipher_create_compat(algname, drvname, basename);
	err = PTR_ERR(simd);
	if (IS_ERR(simd))
	goto unregister_simds;

	aes_simd_algs[i] = simd;
	}

	return 0;

	unregister_simds:
	aes_exit();
	return err;
	}

	#ifdef USE_V8_CRYPTO_EXTENSIONS
	module_cpu_feature_match(AES, aes_init);
	#else
	module_init(aes_init);
	#endif
	module_exit(aes_exit);