arch/arm64/crypto/aes-glue.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * linux/arch/arm64/crypto/aes-glue.c - wrapper code for ARMv8 AES
 *
 * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org>
 */

#include <crypto/aes.h>
#include <crypto/ctr.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/sha2.h>
#include <crypto/utils.h>
#include <crypto/xts.h>
#include <linux/cpufeature.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>

#include <asm/hwcap.h>
#include <asm/simd.h>

#ifdef USE_V8_CRYPTO_EXTENSIONS
#define MODE			"ce"
#define PRIO			300
#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_cbc_cts_encrypt	ce_aes_cbc_cts_encrypt
#define aes_cbc_cts_decrypt	ce_aes_cbc_cts_decrypt
#define aes_essiv_cbc_encrypt	ce_aes_essiv_cbc_encrypt
#define aes_essiv_cbc_decrypt	ce_aes_essiv_cbc_decrypt
#define aes_ctr_encrypt		ce_aes_ctr_encrypt
#define aes_xctr_encrypt	ce_aes_xctr_encrypt
#define aes_xts_encrypt		ce_aes_xts_encrypt
#define aes_xts_decrypt		ce_aes_xts_decrypt
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS/XCTR using ARMv8 Crypto Extensions");
#else
#define MODE			"neon"
#define PRIO			200
#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_cbc_cts_encrypt	neon_aes_cbc_cts_encrypt
#define aes_cbc_cts_decrypt	neon_aes_cbc_cts_decrypt
#define aes_essiv_cbc_encrypt	neon_aes_essiv_cbc_encrypt
#define aes_essiv_cbc_decrypt	neon_aes_essiv_cbc_decrypt
#define aes_ctr_encrypt		neon_aes_ctr_encrypt
#define aes_xctr_encrypt	neon_aes_xctr_encrypt
#define aes_xts_encrypt		neon_aes_xts_encrypt
#define aes_xts_decrypt		neon_aes_xts_decrypt
MODULE_DESCRIPTION("AES-ECB/CBC/CTR/XTS/XCTR using ARMv8 NEON");
#endif
#if defined(USE_V8_CRYPTO_EXTENSIONS) || !IS_ENABLED(CONFIG_CRYPTO_AES_ARM64_BS)
MODULE_ALIAS_CRYPTO("ecb(aes)");
MODULE_ALIAS_CRYPTO("cbc(aes)");
MODULE_ALIAS_CRYPTO("ctr(aes)");
MODULE_ALIAS_CRYPTO("xts(aes)");
MODULE_ALIAS_CRYPTO("xctr(aes)");
#endif
MODULE_ALIAS_CRYPTO("cts(cbc(aes))");
MODULE_ALIAS_CRYPTO("essiv(cbc(aes),sha256)");

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

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

struct crypto_aes_essiv_cbc_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)
{
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);

	return aes_expandkey(ctx, in_key, key_len);
}

static int __maybe_unused 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);
	return ret;
}

static int __maybe_unused essiv_cbc_set_key(struct crypto_skcipher *tfm,
					    const u8 *in_key,
					    unsigned int key_len)
{
	struct crypto_aes_essiv_cbc_ctx *ctx = crypto_skcipher_ctx(tfm);
	u8 digest[SHA256_DIGEST_SIZE];
	int ret;

	ret = aes_expandkey(&ctx->key1, in_key, key_len);
	if (ret)
		return ret;

	sha256(in_key, key_len, digest);

	return aes_expandkey(&ctx->key2, digest, sizeof(digest));
}

static int __maybe_unused 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, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

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

	while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
		scoped_ksimd()
			aes_ecb_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
					ctx->key_enc, rounds, blocks);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	return err;
}

static int __maybe_unused 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, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int blocks;

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

	while ((blocks = (walk.nbytes / AES_BLOCK_SIZE))) {
		scoped_ksimd()
			aes_ecb_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
					ctx->key_dec, rounds, blocks);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	return err;
}

static int cbc_encrypt_walk(struct skcipher_request *req,
			    struct skcipher_walk *walk)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err = 0, rounds = 6 + ctx->key_length / 4;
	unsigned int blocks;

	while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) {
		scoped_ksimd()
			aes_cbc_encrypt(walk->dst.virt.addr, walk->src.virt.addr,
					ctx->key_enc, rounds, blocks, walk->iv);
		err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE);
	}
	return err;
}

static int __maybe_unused cbc_encrypt(struct skcipher_request *req)
{
	struct skcipher_walk walk;
	int err;

	err = skcipher_walk_virt(&walk, req, false);
	if (err)
		return err;
	return cbc_encrypt_walk(req, &walk);
}

static int cbc_decrypt_walk(struct skcipher_request *req,
			    struct skcipher_walk *walk)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err = 0, rounds = 6 + ctx->key_length / 4;
	unsigned int blocks;

	while ((blocks = (walk->nbytes / AES_BLOCK_SIZE))) {
		scoped_ksimd()
			aes_cbc_decrypt(walk->dst.virt.addr, walk->src.virt.addr,
					ctx->key_dec, rounds, blocks, walk->iv);
		err = skcipher_walk_done(walk, walk->nbytes % AES_BLOCK_SIZE);
	}
	return err;
}

static int __maybe_unused cbc_decrypt(struct skcipher_request *req)
{
	struct skcipher_walk walk;
	int err;

	err = skcipher_walk_virt(&walk, req, false);
	if (err)
		return err;
	return cbc_decrypt_walk(req, &walk);
}

static int cts_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, rounds = 6 + ctx->key_length / 4;
	int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2;
	struct scatterlist *src = req->src, *dst = req->dst;
	struct scatterlist sg_src[2], sg_dst[2];
	struct skcipher_request subreq;
	struct skcipher_walk walk;

	skcipher_request_set_tfm(&subreq, tfm);
	skcipher_request_set_callback(&subreq, skcipher_request_flags(req),
				      NULL, NULL);

	if (req->cryptlen <= AES_BLOCK_SIZE) {
		if (req->cryptlen < AES_BLOCK_SIZE)
			return -EINVAL;
		cbc_blocks = 1;
	}

	if (cbc_blocks > 0) {
		skcipher_request_set_crypt(&subreq, req->src, req->dst,
					   cbc_blocks * AES_BLOCK_SIZE,
					   req->iv);

		err = skcipher_walk_virt(&walk, &subreq, false) ?:
		      cbc_encrypt_walk(&subreq, &walk);
		if (err)
			return err;

		if (req->cryptlen == AES_BLOCK_SIZE)
			return 0;

		dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen);
		if (req->dst != req->src)
			dst = scatterwalk_ffwd(sg_dst, req->dst,
					       subreq.cryptlen);
	}

	/* handle ciphertext stealing */
	skcipher_request_set_crypt(&subreq, src, dst,
				   req->cryptlen - cbc_blocks * AES_BLOCK_SIZE,
				   req->iv);

	err = skcipher_walk_virt(&walk, &subreq, false);
	if (err)
		return err;

	scoped_ksimd()
		aes_cbc_cts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				    ctx->key_enc, rounds, walk.nbytes, walk.iv);

	return skcipher_walk_done(&walk, 0);
}

static int cts_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, rounds = 6 + ctx->key_length / 4;
	int cbc_blocks = DIV_ROUND_UP(req->cryptlen, AES_BLOCK_SIZE) - 2;
	struct scatterlist *src = req->src, *dst = req->dst;
	struct scatterlist sg_src[2], sg_dst[2];
	struct skcipher_request subreq;
	struct skcipher_walk walk;

	skcipher_request_set_tfm(&subreq, tfm);
	skcipher_request_set_callback(&subreq, skcipher_request_flags(req),
				      NULL, NULL);

	if (req->cryptlen <= AES_BLOCK_SIZE) {
		if (req->cryptlen < AES_BLOCK_SIZE)
			return -EINVAL;
		cbc_blocks = 1;
	}

	if (cbc_blocks > 0) {
		skcipher_request_set_crypt(&subreq, req->src, req->dst,
					   cbc_blocks * AES_BLOCK_SIZE,
					   req->iv);

		err = skcipher_walk_virt(&walk, &subreq, false) ?:
		      cbc_decrypt_walk(&subreq, &walk);
		if (err)
			return err;

		if (req->cryptlen == AES_BLOCK_SIZE)
			return 0;

		dst = src = scatterwalk_ffwd(sg_src, req->src, subreq.cryptlen);
		if (req->dst != req->src)
			dst = scatterwalk_ffwd(sg_dst, req->dst,
					       subreq.cryptlen);
	}

	/* handle ciphertext stealing */
	skcipher_request_set_crypt(&subreq, src, dst,
				   req->cryptlen - cbc_blocks * AES_BLOCK_SIZE,
				   req->iv);

	err = skcipher_walk_virt(&walk, &subreq, false);
	if (err)
		return err;

	scoped_ksimd()
		aes_cbc_cts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
				    ctx->key_dec, rounds, walk.nbytes, walk.iv);

	return skcipher_walk_done(&walk, 0);
}

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

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

	blocks = walk.nbytes / AES_BLOCK_SIZE;
	if (blocks) {
		scoped_ksimd()
			aes_essiv_cbc_encrypt(walk.dst.virt.addr,
					      walk.src.virt.addr,
					      ctx->key1.key_enc, rounds, blocks,
					      req->iv, ctx->key2.key_enc);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	return err ?: cbc_encrypt_walk(req, &walk);
}

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

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

	blocks = walk.nbytes / AES_BLOCK_SIZE;
	if (blocks) {
		scoped_ksimd()
			aes_essiv_cbc_decrypt(walk.dst.virt.addr,
					      walk.src.virt.addr,
					      ctx->key1.key_dec, rounds, blocks,
					      req->iv, ctx->key2.key_enc);
		err = skcipher_walk_done(&walk, walk.nbytes % AES_BLOCK_SIZE);
	}
	return err ?: cbc_decrypt_walk(req, &walk);
}

static int __maybe_unused xctr_encrypt(struct skcipher_request *req)
{
	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
	struct crypto_aes_ctx *ctx = crypto_skcipher_ctx(tfm);
	int err, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;
	unsigned int byte_ctr = 0;

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

	while (walk.nbytes > 0) {
		const u8 *src = walk.src.virt.addr;
		unsigned int nbytes = walk.nbytes;
		u8 *dst = walk.dst.virt.addr;
		u8 buf[AES_BLOCK_SIZE];

		/*
		 * If given less than 16 bytes, we must copy the partial block
		 * into a temporary buffer of 16 bytes to avoid out of bounds
		 * reads and writes.  Furthermore, this code is somewhat unusual
		 * in that it expects the end of the data to be at the end of
		 * the temporary buffer, rather than the start of the data at
		 * the start of the temporary buffer.
		 */
		if (unlikely(nbytes < AES_BLOCK_SIZE))
			src = dst = memcpy(buf + sizeof(buf) - nbytes,
					   src, nbytes);
		else if (nbytes < walk.total)
			nbytes &= ~(AES_BLOCK_SIZE - 1);

		scoped_ksimd()
			aes_xctr_encrypt(dst, src, ctx->key_enc, rounds, nbytes,
							 walk.iv, byte_ctr);

		if (unlikely(nbytes < AES_BLOCK_SIZE))
			memcpy(walk.dst.virt.addr,
			       buf + sizeof(buf) - nbytes, nbytes);
		byte_ctr += nbytes;

		err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
	}

	return err;
}

static int __maybe_unused 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, rounds = 6 + ctx->key_length / 4;
	struct skcipher_walk walk;

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

	while (walk.nbytes > 0) {
		const u8 *src = walk.src.virt.addr;
		unsigned int nbytes = walk.nbytes;
		u8 *dst = walk.dst.virt.addr;
		u8 buf[AES_BLOCK_SIZE];

		/*
		 * If given less than 16 bytes, we must copy the partial block
		 * into a temporary buffer of 16 bytes to avoid out of bounds
		 * reads and writes.  Furthermore, this code is somewhat unusual
		 * in that it expects the end of the data to be at the end of
		 * the temporary buffer, rather than the start of the data at
		 * the start of the temporary buffer.
		 */
		if (unlikely(nbytes < AES_BLOCK_SIZE))
			src = dst = memcpy(buf + sizeof(buf) - nbytes,
					   src, nbytes);
		else if (nbytes < walk.total)
			nbytes &= ~(AES_BLOCK_SIZE - 1);

		scoped_ksimd()
			aes_ctr_encrypt(dst, src, ctx->key_enc, rounds, nbytes,
					walk.iv);

		if (unlikely(nbytes < AES_BLOCK_SIZE))
			memcpy(walk.dst.virt.addr,
			       buf + sizeof(buf) - nbytes, nbytes);

		err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
	}

	return err;
}

static int __maybe_unused 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;
	int tail = req->cryptlen % AES_BLOCK_SIZE;
	struct scatterlist sg_src[2], sg_dst[2];
	struct skcipher_request subreq;
	struct scatterlist *src, *dst;
	struct skcipher_walk walk;

	if (req->cryptlen < AES_BLOCK_SIZE)
		return -EINVAL;

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

	if (unlikely(tail > 0 && walk.nbytes < walk.total)) {
		int xts_blocks = DIV_ROUND_UP(req->cryptlen,
					      AES_BLOCK_SIZE) - 2;

		skcipher_walk_abort(&walk);

		skcipher_request_set_tfm(&subreq, tfm);
		skcipher_request_set_callback(&subreq,
					      skcipher_request_flags(req),
					      NULL, NULL);
		skcipher_request_set_crypt(&subreq, req->src, req->dst,
					   xts_blocks * AES_BLOCK_SIZE,
					   req->iv);
		req = &subreq;
		err = skcipher_walk_virt(&walk, req, false);
	} else {
		tail = 0;
	}

	scoped_ksimd() {
		for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) {
			int nbytes = walk.nbytes;

			if (walk.nbytes < walk.total)
				nbytes &= ~(AES_BLOCK_SIZE - 1);

			aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
					ctx->key1.key_enc, rounds, nbytes,
					ctx->key2.key_enc, walk.iv, first);
			err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
		}

		if (err || likely(!tail))
			return err;

		dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen);
		if (req->dst != req->src)
			dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen);

		skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail,
					   req->iv);

		err = skcipher_walk_virt(&walk, &subreq, false);
		if (err)
			return err;

		aes_xts_encrypt(walk.dst.virt.addr, walk.src.virt.addr,
				ctx->key1.key_enc, rounds, walk.nbytes,
				ctx->key2.key_enc, walk.iv, first);
	}
	return skcipher_walk_done(&walk, 0);
}

static int __maybe_unused 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;
	int tail = req->cryptlen % AES_BLOCK_SIZE;
	struct scatterlist sg_src[2], sg_dst[2];
	struct skcipher_request subreq;
	struct scatterlist *src, *dst;
	struct skcipher_walk walk;

	if (req->cryptlen < AES_BLOCK_SIZE)
		return -EINVAL;

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

	if (unlikely(tail > 0 && walk.nbytes < walk.total)) {
		int xts_blocks = DIV_ROUND_UP(req->cryptlen,
					      AES_BLOCK_SIZE) - 2;

		skcipher_walk_abort(&walk);

		skcipher_request_set_tfm(&subreq, tfm);
		skcipher_request_set_callback(&subreq,
					      skcipher_request_flags(req),
					      NULL, NULL);
		skcipher_request_set_crypt(&subreq, req->src, req->dst,
					   xts_blocks * AES_BLOCK_SIZE,
					   req->iv);
		req = &subreq;
		err = skcipher_walk_virt(&walk, req, false);
	} else {
		tail = 0;
	}

	scoped_ksimd() {
		for (first = 1; walk.nbytes >= AES_BLOCK_SIZE; first = 0) {
			int nbytes = walk.nbytes;

			if (walk.nbytes < walk.total)
				nbytes &= ~(AES_BLOCK_SIZE - 1);

			aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
					ctx->key1.key_dec, rounds, nbytes,
					ctx->key2.key_enc, walk.iv, first);
			err = skcipher_walk_done(&walk, walk.nbytes - nbytes);
		}

		if (err || likely(!tail))
			return err;

		dst = src = scatterwalk_ffwd(sg_src, req->src, req->cryptlen);
		if (req->dst != req->src)
			dst = scatterwalk_ffwd(sg_dst, req->dst, req->cryptlen);

		skcipher_request_set_crypt(req, src, dst, AES_BLOCK_SIZE + tail,
					   req->iv);

		err = skcipher_walk_virt(&walk, &subreq, false);
		if (err)
			return err;

		aes_xts_decrypt(walk.dst.virt.addr, walk.src.virt.addr,
				ctx->key1.key_dec, rounds, walk.nbytes,
				ctx->key2.key_enc, walk.iv, first);
	}
	return skcipher_walk_done(&walk, 0);
}

static struct skcipher_alg aes_algs[] = { {
#if defined(USE_V8_CRYPTO_EXTENSIONS) || !IS_ENABLED(CONFIG_CRYPTO_AES_ARM64_BS)
	.base = {
		.cra_name		= "ecb(aes)",
		.cra_driver_name	= "ecb-aes-" MODE,
		.cra_priority		= PRIO,
		.cra_blocksize		= AES_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.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_blocksize		= AES_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.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_blocksize		= 1,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.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		= "xctr(aes)",
		.cra_driver_name	= "xctr-aes-" MODE,
		.cra_priority		= PRIO,
		.cra_blocksize		= 1,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.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	= xctr_encrypt,
	.decrypt	= xctr_encrypt,
}, {
	.base = {
		.cra_name		= "xts(aes)",
		.cra_driver_name	= "xts-aes-" MODE,
		.cra_priority		= PRIO,
		.cra_blocksize		= AES_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct crypto_aes_xts_ctx),
		.cra_module		= THIS_MODULE,
	},
	.min_keysize	= 2 * AES_MIN_KEY_SIZE,
	.max_keysize	= 2 * AES_MAX_KEY_SIZE,
	.ivsize		= AES_BLOCK_SIZE,
	.walksize	= 2 * AES_BLOCK_SIZE,
	.setkey		= xts_set_key,
	.encrypt	= xts_encrypt,
	.decrypt	= xts_decrypt,
}, {
#endif
	.base = {
		.cra_name		= "cts(cbc(aes))",
		.cra_driver_name	= "cts-cbc-aes-" MODE,
		.cra_priority		= PRIO,
		.cra_blocksize		= AES_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct crypto_aes_ctx),
		.cra_module		= THIS_MODULE,
	},
	.min_keysize	= AES_MIN_KEY_SIZE,
	.max_keysize	= AES_MAX_KEY_SIZE,
	.ivsize		= AES_BLOCK_SIZE,
	.walksize	= 2 * AES_BLOCK_SIZE,
	.setkey		= skcipher_aes_setkey,
	.encrypt	= cts_cbc_encrypt,
	.decrypt	= cts_cbc_decrypt,
}, {
	.base = {
		.cra_name		= "essiv(cbc(aes),sha256)",
		.cra_driver_name	= "essiv-cbc-aes-sha256-" MODE,
		.cra_priority		= PRIO + 1,
		.cra_blocksize		= AES_BLOCK_SIZE,
		.cra_ctxsize		= sizeof(struct crypto_aes_essiv_cbc_ctx),
		.cra_module		= THIS_MODULE,
	},
	.min_keysize	= AES_MIN_KEY_SIZE,
	.max_keysize	= AES_MAX_KEY_SIZE,
	.ivsize		= AES_BLOCK_SIZE,
	.setkey		= essiv_cbc_set_key,
	.encrypt	= essiv_cbc_encrypt,
	.decrypt	= essiv_cbc_decrypt,
} };

static void aes_exit(void)
{
	crypto_unregister_skciphers(aes_algs, ARRAY_SIZE(aes_algs));
}

static int __init aes_init(void)
{
	return crypto_register_skciphers(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);