arch/arm/crypto/aesbs-glue.c - linux - Git at Google

 /*
  * linux/arch/arm/crypto/aesbs-glue.c - glue code for NEON bit sliced 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 <crypto/aes.h>
 #include <crypto/cbc.h>
 #include <crypto/internal/simd.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/module.h>
 #include <crypto/xts.h>

 #include "aes_glue.h"

 #define BIT_SLICED_KEY_MAXSIZE	(128 * (AES_MAXNR - 1) + 2 * AES_BLOCK_SIZE)

 struct BS_KEY {
 	struct AES_KEY	rk;
 	int		converted;
 	u8 __aligned(8)	bs[BIT_SLICED_KEY_MAXSIZE];
 } __aligned(8);

 asmlinkage void bsaes_enc_key_convert(u8 out[], struct AES_KEY const *in);
 asmlinkage void bsaes_dec_key_convert(u8 out[], struct AES_KEY const *in);

 asmlinkage void bsaes_cbc_encrypt(u8 const in[], u8 out[], u32 bytes,
 				  struct BS_KEY *key, u8 iv[]);

 asmlinkage void bsaes_ctr32_encrypt_blocks(u8 const in[], u8 out[], u32 blocks,
 					   struct BS_KEY *key, u8 const iv[]);

 asmlinkage void bsaes_xts_encrypt(u8 const in[], u8 out[], u32 bytes,
 				  struct BS_KEY *key, u8 tweak[]);

 asmlinkage void bsaes_xts_decrypt(u8 const in[], u8 out[], u32 bytes,
 				  struct BS_KEY *key, u8 tweak[]);

 struct aesbs_cbc_ctx {
 	struct AES_KEY	enc;
 	struct BS_KEY	dec;
 };

 struct aesbs_ctr_ctx {
 	struct BS_KEY	enc;
 };

 struct aesbs_xts_ctx {
 	struct BS_KEY	enc;
 	struct BS_KEY	dec;
 	struct AES_KEY	twkey;
 };

 static int aesbs_cbc_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
 			     unsigned int key_len)
 {
 	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int bits = key_len * 8;

 	if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc)) {
 		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}
 	ctx->dec.rk = ctx->enc;
 	private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
 	ctx->dec.converted = 0;
 	return 0;
 }

 static int aesbs_ctr_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
 			     unsigned int key_len)
 {
 	struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int bits = key_len * 8;

 	if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
 		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}
 	ctx->enc.converted = 0;
 	return 0;
 }

 static int aesbs_xts_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
 			     unsigned int key_len)
 {
 	struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 	int bits = key_len * 4;
 	int err;

 	err = xts_verify_key(tfm, in_key, key_len);
 	if (err)
 		return err;

 	if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
 		crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
 		return -EINVAL;
 	}
 	ctx->dec.rk = ctx->enc.rk;
 	private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
 	private_AES_set_encrypt_key(in_key + key_len / 2, bits, &ctx->twkey);
 	ctx->enc.converted = ctx->dec.converted = 0;
 	return 0;
 }

 static inline void aesbs_encrypt_one(struct crypto_skcipher *tfm,
 				     const u8 *src, u8 *dst)
 {
 	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);

 	AES_encrypt(src, dst, &ctx->enc);
 }

 static int aesbs_cbc_encrypt(struct skcipher_request *req)
 {
 	return crypto_cbc_encrypt_walk(req, aesbs_encrypt_one);
 }

 static inline void aesbs_decrypt_one(struct crypto_skcipher *tfm,
 				     const u8 *src, u8 *dst)
 {
 	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);

 	AES_decrypt(src, dst, &ctx->dec.rk);
 }

 static int aesbs_cbc_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct skcipher_walk walk;
 	unsigned int nbytes;
 	int err;

 	for (err = skcipher_walk_virt(&walk, req, false);
 	     (nbytes = walk.nbytes); err = skcipher_walk_done(&walk, nbytes)) {
 		u32 blocks = nbytes / AES_BLOCK_SIZE;
 		u8 *dst = walk.dst.virt.addr;
 		u8 *src = walk.src.virt.addr;
 		u8 *iv = walk.iv;

 		if (blocks >= 8) {
 			kernel_neon_begin();
 			bsaes_cbc_encrypt(src, dst, nbytes, &ctx->dec, iv);
 			kernel_neon_end();
 			nbytes %= AES_BLOCK_SIZE;
 			continue;
 		}

 		nbytes = crypto_cbc_decrypt_blocks(&walk, tfm,
 						   aesbs_decrypt_one);
 	}
 	return err;
 }

 static void inc_be128_ctr(__be32 ctr[], u32 addend)
 {
 	int i;

 	for (i = 3; i >= 0; i--, addend = 1) {
 		u32 n = be32_to_cpu(ctr[i]) + addend;

 		ctr[i] = cpu_to_be32(n);
 		if (n >= addend)
 			break;
 	}
 }

 static int aesbs_ctr_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct skcipher_walk walk;
 	u32 blocks;
 	int err;

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

 	while ((blocks = walk.nbytes / AES_BLOCK_SIZE)) {
 		u32 tail = walk.nbytes % AES_BLOCK_SIZE;
 		__be32 *ctr = (__be32 *)walk.iv;
 		u32 headroom = UINT_MAX - be32_to_cpu(ctr[3]);

 		/* avoid 32 bit counter overflow in the NEON code */
 		if (unlikely(headroom < blocks)) {
 			blocks = headroom + 1;
 			tail = walk.nbytes - blocks * AES_BLOCK_SIZE;
 		}
 		kernel_neon_begin();
 		bsaes_ctr32_encrypt_blocks(walk.src.virt.addr,
 					   walk.dst.virt.addr, blocks,
 					   &ctx->enc, walk.iv);
 		kernel_neon_end();
 		inc_be128_ctr(ctr, blocks);

 		err = skcipher_walk_done(&walk, tail);
 	}
 	if (walk.nbytes) {
 		u8 *tdst = walk.dst.virt.addr + blocks * AES_BLOCK_SIZE;
 		u8 *tsrc = walk.src.virt.addr + blocks * AES_BLOCK_SIZE;
 		u8 ks[AES_BLOCK_SIZE];

 		AES_encrypt(walk.iv, ks, &ctx->enc.rk);
 		if (tdst != tsrc)
 			memcpy(tdst, tsrc, walk.nbytes);
 		crypto_xor(tdst, ks, walk.nbytes);
 		err = skcipher_walk_done(&walk, 0);
 	}
 	return err;
 }

 static int aesbs_xts_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct skcipher_walk walk;
 	int err;

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

 	/* generate the initial tweak */
 	AES_encrypt(walk.iv, walk.iv, &ctx->twkey);

 	while (walk.nbytes) {
 		kernel_neon_begin();
 		bsaes_xts_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
 				  walk.nbytes, &ctx->enc, walk.iv);
 		kernel_neon_end();
 		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 	}
 	return err;
 }

 static int aesbs_xts_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct skcipher_walk walk;
 	int err;

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

 	/* generate the initial tweak */
 	AES_encrypt(walk.iv, walk.iv, &ctx->twkey);

 	while (walk.nbytes) {
 		kernel_neon_begin();
 		bsaes_xts_decrypt(walk.src.virt.addr, walk.dst.virt.addr,
 				  walk.nbytes, &ctx->dec, walk.iv);
 		kernel_neon_end();
 		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
 	}
 	return err;
 }

 static struct skcipher_alg aesbs_algs[] = { {
 	.base = {
 		.cra_name		= "__cbc(aes)",
 		.cra_driver_name	= "__cbc-aes-neonbs",
 		.cra_priority		= 300,
 		.cra_flags		= CRYPTO_ALG_INTERNAL,
 		.cra_blocksize		= AES_BLOCK_SIZE,
 		.cra_ctxsize		= sizeof(struct aesbs_cbc_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		= aesbs_cbc_set_key,
 	.encrypt	= aesbs_cbc_encrypt,
 	.decrypt	= aesbs_cbc_decrypt,
 }, {
 	.base = {
 		.cra_name		= "__ctr(aes)",
 		.cra_driver_name	= "__ctr-aes-neonbs",
 		.cra_priority		= 300,
 		.cra_flags		= CRYPTO_ALG_INTERNAL,
 		.cra_blocksize		= 1,
 		.cra_ctxsize		= sizeof(struct aesbs_ctr_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		= aesbs_ctr_set_key,
 	.encrypt	= aesbs_ctr_encrypt,
 	.decrypt	= aesbs_ctr_encrypt,
 }, {
 	.base = {
 		.cra_name		= "__xts(aes)",
 		.cra_driver_name	= "__xts-aes-neonbs",
 		.cra_priority		= 300,
 		.cra_flags		= CRYPTO_ALG_INTERNAL,
 		.cra_blocksize		= AES_BLOCK_SIZE,
 		.cra_ctxsize		= sizeof(struct aesbs_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		= aesbs_xts_set_key,
 	.encrypt	= aesbs_xts_encrypt,
 	.decrypt	= aesbs_xts_decrypt,
 } };

 struct simd_skcipher_alg *aesbs_simd_algs[ARRAY_SIZE(aesbs_algs)];

 static void aesbs_mod_exit(void)
 {
 	int i;

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

 	crypto_unregister_skciphers(aesbs_algs, ARRAY_SIZE(aesbs_algs));
 }

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

 	if (!cpu_has_neon())
 		return -ENODEV;

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

 	for (i = 0; i < ARRAY_SIZE(aesbs_algs); i++) {
 		algname = aesbs_algs[i].base.cra_name + 2;
 		drvname = aesbs_algs[i].base.cra_driver_name + 2;
 		basename = aesbs_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;

 		aesbs_simd_algs[i] = simd;
 	}

 	return 0;

 unregister_simds:
 	aesbs_mod_exit();
 	return err;
 }

 module_init(aesbs_mod_init);
 module_exit(aesbs_mod_exit);

 MODULE_DESCRIPTION("Bit sliced AES in CBC/CTR/XTS modes using NEON");
 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
 MODULE_LICENSE("GPL");
	/*
	* linux/arch/arm/crypto/aesbs-glue.c - glue code for NEON bit sliced 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 <crypto/aes.h>
	#include <crypto/cbc.h>
	#include <crypto/internal/simd.h>
	#include <crypto/internal/skcipher.h>
	#include <linux/module.h>
	#include <crypto/xts.h>

	#include "aes_glue.h"

	#define BIT_SLICED_KEY_MAXSIZE (128 * (AES_MAXNR - 1) + 2 * AES_BLOCK_SIZE)

	struct BS_KEY {
	struct AES_KEY rk;
	int converted;
	u8 __aligned(8) bs[BIT_SLICED_KEY_MAXSIZE];
	} __aligned(8);

	asmlinkage void bsaes_enc_key_convert(u8 out[], struct AES_KEY const *in);
	asmlinkage void bsaes_dec_key_convert(u8 out[], struct AES_KEY const *in);

	asmlinkage void bsaes_cbc_encrypt(u8 const in[], u8 out[], u32 bytes,
	struct BS_KEY *key, u8 iv[]);

	asmlinkage void bsaes_ctr32_encrypt_blocks(u8 const in[], u8 out[], u32 blocks,
	struct BS_KEY *key, u8 const iv[]);

	asmlinkage void bsaes_xts_encrypt(u8 const in[], u8 out[], u32 bytes,
	struct BS_KEY *key, u8 tweak[]);

	asmlinkage void bsaes_xts_decrypt(u8 const in[], u8 out[], u32 bytes,
	struct BS_KEY *key, u8 tweak[]);

	struct aesbs_cbc_ctx {
	struct AES_KEY enc;
	struct BS_KEY dec;
	};

	struct aesbs_ctr_ctx {
	struct BS_KEY enc;
	};

	struct aesbs_xts_ctx {
	struct BS_KEY enc;
	struct BS_KEY dec;
	struct AES_KEY twkey;
	};

	static int aesbs_cbc_set_key(struct crypto_skcipher tfm, const u8 in_key,
	unsigned int key_len)
	{
	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
	int bits = key_len * 8;

	if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc)) {
	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	return -EINVAL;
	}
	ctx->dec.rk = ctx->enc;
	private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
	ctx->dec.converted = 0;
	return 0;
	}

	static int aesbs_ctr_set_key(struct crypto_skcipher tfm, const u8 in_key,
	unsigned int key_len)
	{
	struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
	int bits = key_len * 8;

	if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	return -EINVAL;
	}
	ctx->enc.converted = 0;
	return 0;
	}

	static int aesbs_xts_set_key(struct crypto_skcipher tfm, const u8 in_key,
	unsigned int key_len)
	{
	struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	int bits = key_len * 4;
	int err;

	err = xts_verify_key(tfm, in_key, key_len);
	if (err)
	return err;

	if (private_AES_set_encrypt_key(in_key, bits, &ctx->enc.rk)) {
	crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
	return -EINVAL;
	}
	ctx->dec.rk = ctx->enc.rk;
	private_AES_set_decrypt_key(in_key, bits, &ctx->dec.rk);
	private_AES_set_encrypt_key(in_key + key_len / 2, bits, &ctx->twkey);
	ctx->enc.converted = ctx->dec.converted = 0;
	return 0;
	}

	static inline void aesbs_encrypt_one(struct crypto_skcipher *tfm,
	const u8 src, u8 dst)
	{
	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);

	AES_encrypt(src, dst, &ctx->enc);
	}

	static int aesbs_cbc_encrypt(struct skcipher_request *req)
	{
	return crypto_cbc_encrypt_walk(req, aesbs_encrypt_one);
	}

	static inline void aesbs_decrypt_one(struct crypto_skcipher *tfm,
	const u8 src, u8 dst)
	{
	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);

	AES_decrypt(src, dst, &ctx->dec.rk);
	}

	static int aesbs_cbc_decrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct aesbs_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_walk walk;
	unsigned int nbytes;
	int err;

	for (err = skcipher_walk_virt(&walk, req, false);
	(nbytes = walk.nbytes); err = skcipher_walk_done(&walk, nbytes)) {
	u32 blocks = nbytes / AES_BLOCK_SIZE;
	u8 *dst = walk.dst.virt.addr;
	u8 *src = walk.src.virt.addr;
	u8 *iv = walk.iv;

	if (blocks >= 8) {
	kernel_neon_begin();
	bsaes_cbc_encrypt(src, dst, nbytes, &ctx->dec, iv);
	kernel_neon_end();
	nbytes %= AES_BLOCK_SIZE;
	continue;
	}

	nbytes = crypto_cbc_decrypt_blocks(&walk, tfm,
	aesbs_decrypt_one);
	}
	return err;
	}

	static void inc_be128_ctr(__be32 ctr[], u32 addend)
	{
	int i;

	for (i = 3; i >= 0; i--, addend = 1) {
	u32 n = be32_to_cpu(ctr[i]) + addend;

	ctr[i] = cpu_to_be32(n);
	if (n >= addend)
	break;
	}
	}

	static int aesbs_ctr_encrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct aesbs_ctr_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_walk walk;
	u32 blocks;
	int err;

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

	while ((blocks = walk.nbytes / AES_BLOCK_SIZE)) {
	u32 tail = walk.nbytes % AES_BLOCK_SIZE;
	__be32 ctr = (__be32 )walk.iv;
	u32 headroom = UINT_MAX - be32_to_cpu(ctr[3]);

	/* avoid 32 bit counter overflow in the NEON code */
	if (unlikely(headroom < blocks)) {
	blocks = headroom + 1;
	tail = walk.nbytes - blocks * AES_BLOCK_SIZE;
	}
	kernel_neon_begin();
	bsaes_ctr32_encrypt_blocks(walk.src.virt.addr,
	walk.dst.virt.addr, blocks,
	&ctx->enc, walk.iv);
	kernel_neon_end();
	inc_be128_ctr(ctr, blocks);

	err = skcipher_walk_done(&walk, tail);
	}
	if (walk.nbytes) {
	u8 tdst = walk.dst.virt.addr + blocks AES_BLOCK_SIZE;
	u8 tsrc = walk.src.virt.addr + blocks AES_BLOCK_SIZE;
	u8 ks[AES_BLOCK_SIZE];

	AES_encrypt(walk.iv, ks, &ctx->enc.rk);
	if (tdst != tsrc)
	memcpy(tdst, tsrc, walk.nbytes);
	crypto_xor(tdst, ks, walk.nbytes);
	err = skcipher_walk_done(&walk, 0);
	}
	return err;
	}

	static int aesbs_xts_encrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_walk walk;
	int err;

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

	/* generate the initial tweak */
	AES_encrypt(walk.iv, walk.iv, &ctx->twkey);

	while (walk.nbytes) {
	kernel_neon_begin();
	bsaes_xts_encrypt(walk.src.virt.addr, walk.dst.virt.addr,
	walk.nbytes, &ctx->enc, walk.iv);
	kernel_neon_end();
	err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	return err;
	}

	static int aesbs_xts_decrypt(struct skcipher_request *req)
	{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct aesbs_xts_ctx *ctx = crypto_skcipher_ctx(tfm);
	struct skcipher_walk walk;
	int err;

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

	/* generate the initial tweak */
	AES_encrypt(walk.iv, walk.iv, &ctx->twkey);

	while (walk.nbytes) {
	kernel_neon_begin();
	bsaes_xts_decrypt(walk.src.virt.addr, walk.dst.virt.addr,
	walk.nbytes, &ctx->dec, walk.iv);
	kernel_neon_end();
	err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	return err;
	}

	static struct skcipher_alg aesbs_algs[] = { {
	.base = {
	.cra_name = "__cbc(aes)",
	.cra_driver_name = "__cbc-aes-neonbs",
	.cra_priority = 300,
	.cra_flags = CRYPTO_ALG_INTERNAL,
	.cra_blocksize = AES_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct aesbs_cbc_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 = aesbs_cbc_set_key,
	.encrypt = aesbs_cbc_encrypt,
	.decrypt = aesbs_cbc_decrypt,
	}, {
	.base = {
	.cra_name = "__ctr(aes)",
	.cra_driver_name = "__ctr-aes-neonbs",
	.cra_priority = 300,
	.cra_flags = CRYPTO_ALG_INTERNAL,
	.cra_blocksize = 1,
	.cra_ctxsize = sizeof(struct aesbs_ctr_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 = aesbs_ctr_set_key,
	.encrypt = aesbs_ctr_encrypt,
	.decrypt = aesbs_ctr_encrypt,
	}, {
	.base = {
	.cra_name = "__xts(aes)",
	.cra_driver_name = "__xts-aes-neonbs",
	.cra_priority = 300,
	.cra_flags = CRYPTO_ALG_INTERNAL,
	.cra_blocksize = AES_BLOCK_SIZE,
	.cra_ctxsize = sizeof(struct aesbs_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 = aesbs_xts_set_key,
	.encrypt = aesbs_xts_encrypt,
	.decrypt = aesbs_xts_decrypt,
	} };

	struct simd_skcipher_alg *aesbs_simd_algs[ARRAY_SIZE(aesbs_algs)];

	static void aesbs_mod_exit(void)
	{
	int i;

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

	crypto_unregister_skciphers(aesbs_algs, ARRAY_SIZE(aesbs_algs));
	}

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

	if (!cpu_has_neon())
	return -ENODEV;

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

	for (i = 0; i < ARRAY_SIZE(aesbs_algs); i++) {
	algname = aesbs_algs[i].base.cra_name + 2;
	drvname = aesbs_algs[i].base.cra_driver_name + 2;
	basename = aesbs_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;

	aesbs_simd_algs[i] = simd;
	}

	return 0;

	unregister_simds:
	aesbs_mod_exit();
	return err;
	}

	module_init(aesbs_mod_init);
	module_exit(aesbs_mod_exit);

	MODULE_DESCRIPTION("Bit sliced AES in CBC/CTR/XTS modes using NEON");
	MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
	MODULE_LICENSE("GPL");