[linux-block.git] / crypto / aegis128-core.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * The AEGIS-128 Authenticated-Encryption Algorithm
 *
 * Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
 * Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
 */

#include <crypto/algapi.h>
#include <crypto/internal/aead.h>
#include <crypto/internal/simd.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>

#include <asm/simd.h>

#include "aegis.h"

#define AEGIS128_NONCE_SIZE 16
#define AEGIS128_STATE_BLOCKS 5
#define AEGIS128_KEY_SIZE 16
#define AEGIS128_MIN_AUTH_SIZE 8
#define AEGIS128_MAX_AUTH_SIZE 16

struct aegis_state {
	union aegis_block blocks[AEGIS128_STATE_BLOCKS];
};

struct aegis_ctx {
	union aegis_block key;
};

static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_simd);

static const union aegis_block crypto_aegis_const[2] = {
	{ .words64 = {
		cpu_to_le64(U64_C(0x0d08050302010100)),
		cpu_to_le64(U64_C(0x6279e99059372215)),
	} },
	{ .words64 = {
		cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
		cpu_to_le64(U64_C(0xdd28b57342311120)),
	} },
};

static bool aegis128_do_simd(void)
{
#ifdef CONFIG_CRYPTO_AEGIS128_SIMD
	if (static_branch_likely(&have_simd))
		return crypto_simd_usable();
#endif
	return false;
}

static void crypto_aegis128_update(struct aegis_state *state)
{
	union aegis_block tmp;
	unsigned int i;

	tmp = state->blocks[AEGIS128_STATE_BLOCKS - 1];
	for (i = AEGIS128_STATE_BLOCKS - 1; i > 0; i--)
		crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
				    &state->blocks[i]);
	crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
}

static void crypto_aegis128_update_a(struct aegis_state *state,
				     const union aegis_block *msg,
				     bool do_simd)
{
	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
		crypto_aegis128_update_simd(state, msg);
		return;
	}

	crypto_aegis128_update(state);
	crypto_aegis_block_xor(&state->blocks[0], msg);
}

static void crypto_aegis128_update_u(struct aegis_state *state, const void *msg,
				     bool do_simd)
{
	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
		crypto_aegis128_update_simd(state, msg);
		return;
	}

	crypto_aegis128_update(state);
	crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
}

static void crypto_aegis128_init(struct aegis_state *state,
				 const union aegis_block *key,
				 const u8 *iv)
{
	union aegis_block key_iv;
	unsigned int i;

	key_iv = *key;
	crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE);

	state->blocks[0] = key_iv;
	state->blocks[1] = crypto_aegis_const[1];
	state->blocks[2] = crypto_aegis_const[0];
	state->blocks[3] = *key;
	state->blocks[4] = *key;

	crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]);
	crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]);

	for (i = 0; i < 5; i++) {
		crypto_aegis128_update_a(state, key, false);
		crypto_aegis128_update_a(state, &key_iv, false);
	}
}

static void crypto_aegis128_ad(struct aegis_state *state,
			       const u8 *src, unsigned int size,
			       bool do_simd)
{
	if (AEGIS_ALIGNED(src)) {
		const union aegis_block *src_blk =
				(const union aegis_block *)src;

		while (size >= AEGIS_BLOCK_SIZE) {
			crypto_aegis128_update_a(state, src_blk, do_simd);

			size -= AEGIS_BLOCK_SIZE;
			src_blk++;
		}
	} else {
		while (size >= AEGIS_BLOCK_SIZE) {
			crypto_aegis128_update_u(state, src, do_simd);

			size -= AEGIS_BLOCK_SIZE;
			src += AEGIS_BLOCK_SIZE;
		}
	}
}

static void crypto_aegis128_wipe_chunk(struct aegis_state *state, u8 *dst,
				       const u8 *src, unsigned int size)
{
	memzero_explicit(dst, size);
}

static void crypto_aegis128_encrypt_chunk(struct aegis_state *state, u8 *dst,
					  const u8 *src, unsigned int size)
{
	union aegis_block tmp;

	if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
		while (size >= AEGIS_BLOCK_SIZE) {
			union aegis_block *dst_blk =
					(union aegis_block *)dst;
			const union aegis_block *src_blk =
					(const union aegis_block *)src;

			tmp = state->blocks[2];
			crypto_aegis_block_and(&tmp, &state->blocks[3]);
			crypto_aegis_block_xor(&tmp, &state->blocks[4]);
			crypto_aegis_block_xor(&tmp, &state->blocks[1]);
			crypto_aegis_block_xor(&tmp, src_blk);

			crypto_aegis128_update_a(state, src_blk, false);

			*dst_blk = tmp;

			size -= AEGIS_BLOCK_SIZE;
			src += AEGIS_BLOCK_SIZE;
			dst += AEGIS_BLOCK_SIZE;
		}
	} else {
		while (size >= AEGIS_BLOCK_SIZE) {
			tmp = state->blocks[2];
			crypto_aegis_block_and(&tmp, &state->blocks[3]);
			crypto_aegis_block_xor(&tmp, &state->blocks[4]);
			crypto_aegis_block_xor(&tmp, &state->blocks[1]);
			crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);

			crypto_aegis128_update_u(state, src, false);

			memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);

			size -= AEGIS_BLOCK_SIZE;
			src += AEGIS_BLOCK_SIZE;
			dst += AEGIS_BLOCK_SIZE;
		}
	}

	if (size > 0) {
		union aegis_block msg = {};
		memcpy(msg.bytes, src, size);

		tmp = state->blocks[2];
		crypto_aegis_block_and(&tmp, &state->blocks[3]);
		crypto_aegis_block_xor(&tmp, &state->blocks[4]);
		crypto_aegis_block_xor(&tmp, &state->blocks[1]);

		crypto_aegis128_update_a(state, &msg, false);

		crypto_aegis_block_xor(&msg, &tmp);

		memcpy(dst, msg.bytes, size);
	}
}

static void crypto_aegis128_decrypt_chunk(struct aegis_state *state, u8 *dst,
					  const u8 *src, unsigned int size)
{
	union aegis_block tmp;

	if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
		while (size >= AEGIS_BLOCK_SIZE) {
			union aegis_block *dst_blk =
					(union aegis_block *)dst;
			const union aegis_block *src_blk =
					(const union aegis_block *)src;

			tmp = state->blocks[2];
			crypto_aegis_block_and(&tmp, &state->blocks[3]);
			crypto_aegis_block_xor(&tmp, &state->blocks[4]);
			crypto_aegis_block_xor(&tmp, &state->blocks[1]);
			crypto_aegis_block_xor(&tmp, src_blk);

			crypto_aegis128_update_a(state, &tmp, false);

			*dst_blk = tmp;

			size -= AEGIS_BLOCK_SIZE;
			src += AEGIS_BLOCK_SIZE;
			dst += AEGIS_BLOCK_SIZE;
		}
	} else {
		while (size >= AEGIS_BLOCK_SIZE) {
			tmp = state->blocks[2];
			crypto_aegis_block_and(&tmp, &state->blocks[3]);
			crypto_aegis_block_xor(&tmp, &state->blocks[4]);
			crypto_aegis_block_xor(&tmp, &state->blocks[1]);
			crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);

			crypto_aegis128_update_a(state, &tmp, false);

			memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);

			size -= AEGIS_BLOCK_SIZE;
			src += AEGIS_BLOCK_SIZE;
			dst += AEGIS_BLOCK_SIZE;
		}
	}

	if (size > 0) {
		union aegis_block msg = {};
		memcpy(msg.bytes, src, size);

		tmp = state->blocks[2];
		crypto_aegis_block_and(&tmp, &state->blocks[3]);
		crypto_aegis_block_xor(&tmp, &state->blocks[4]);
		crypto_aegis_block_xor(&tmp, &state->blocks[1]);
		crypto_aegis_block_xor(&msg, &tmp);

		memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);

		crypto_aegis128_update_a(state, &msg, false);

		memcpy(dst, msg.bytes, size);
	}
}

static void crypto_aegis128_process_ad(struct aegis_state *state,
				       struct scatterlist *sg_src,
				       unsigned int assoclen,
				       bool do_simd)
{
	struct scatter_walk walk;
	union aegis_block buf;
	unsigned int pos = 0;

	scatterwalk_start(&walk, sg_src);
	while (assoclen != 0) {
		unsigned int size = scatterwalk_clamp(&walk, assoclen);
		unsigned int left = size;
		void *mapped = scatterwalk_map(&walk);
		const u8 *src = (const u8 *)mapped;

		if (pos + size >= AEGIS_BLOCK_SIZE) {
			if (pos > 0) {
				unsigned int fill = AEGIS_BLOCK_SIZE - pos;
				memcpy(buf.bytes + pos, src, fill);
				crypto_aegis128_update_a(state, &buf, do_simd);
				pos = 0;
				left -= fill;
				src += fill;
			}

			crypto_aegis128_ad(state, src, left, do_simd);
			src += left & ~(AEGIS_BLOCK_SIZE - 1);
			left &= AEGIS_BLOCK_SIZE - 1;
		}

		memcpy(buf.bytes + pos, src, left);

		pos += left;
		assoclen -= size;
		scatterwalk_unmap(mapped);
		scatterwalk_advance(&walk, size);
		scatterwalk_done(&walk, 0, assoclen);
	}

	if (pos > 0) {
		memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
		crypto_aegis128_update_a(state, &buf, do_simd);
	}
}

static __always_inline
int crypto_aegis128_process_crypt(struct aegis_state *state,
				  struct skcipher_walk *walk,
				  void (*crypt)(struct aegis_state *state,
					        u8 *dst, const u8 *src,
					        unsigned int size))
{
	int err = 0;

	while (walk->nbytes) {
		unsigned int nbytes = walk->nbytes;

		if (nbytes < walk->total)
			nbytes = round_down(nbytes, walk->stride);

		crypt(state, walk->dst.virt.addr, walk->src.virt.addr, nbytes);

		err = skcipher_walk_done(walk, walk->nbytes - nbytes);
	}
	return err;
}

static void crypto_aegis128_final(struct aegis_state *state,
				  union aegis_block *tag_xor,
				  u64 assoclen, u64 cryptlen)
{
	u64 assocbits = assoclen * 8;
	u64 cryptbits = cryptlen * 8;

	union aegis_block tmp;
	unsigned int i;

	tmp.words64[0] = cpu_to_le64(assocbits);
	tmp.words64[1] = cpu_to_le64(cryptbits);

	crypto_aegis_block_xor(&tmp, &state->blocks[3]);

	for (i = 0; i < 7; i++)
		crypto_aegis128_update_a(state, &tmp, false);

	for (i = 0; i < AEGIS128_STATE_BLOCKS; i++)
		crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
}

static int crypto_aegis128_setkey(struct crypto_aead *aead, const u8 *key,
				  unsigned int keylen)
{
	struct aegis_ctx *ctx = crypto_aead_ctx(aead);

	if (keylen != AEGIS128_KEY_SIZE)
		return -EINVAL;

	memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
	return 0;
}

static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,
				       unsigned int authsize)
{
	if (authsize > AEGIS128_MAX_AUTH_SIZE)
		return -EINVAL;
	if (authsize < AEGIS128_MIN_AUTH_SIZE)
		return -EINVAL;
	return 0;
}

static int crypto_aegis128_encrypt_generic(struct aead_request *req)
{
	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	union aegis_block tag = {};
	unsigned int authsize = crypto_aead_authsize(tfm);
	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	unsigned int cryptlen = req->cryptlen;
	struct skcipher_walk walk;
	struct aegis_state state;

	skcipher_walk_aead_encrypt(&walk, req, false);
	crypto_aegis128_init(&state, &ctx->key, req->iv);
	crypto_aegis128_process_ad(&state, req->src, req->assoclen, false);
	crypto_aegis128_process_crypt(&state, &walk,
				      crypto_aegis128_encrypt_chunk);
	crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);

	scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
				 authsize, 1);
	return 0;
}

static int crypto_aegis128_decrypt_generic(struct aead_request *req)
{
	static const u8 zeros[AEGIS128_MAX_AUTH_SIZE] = {};
	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	union aegis_block tag;
	unsigned int authsize = crypto_aead_authsize(tfm);
	unsigned int cryptlen = req->cryptlen - authsize;
	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	struct skcipher_walk walk;
	struct aegis_state state;

	scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
				 authsize, 0);

	skcipher_walk_aead_decrypt(&walk, req, false);
	crypto_aegis128_init(&state, &ctx->key, req->iv);
	crypto_aegis128_process_ad(&state, req->src, req->assoclen, false);
	crypto_aegis128_process_crypt(&state, &walk,
				      crypto_aegis128_decrypt_chunk);
	crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);

	if (unlikely(crypto_memneq(tag.bytes, zeros, authsize))) {
		/*
		 * From Chapter 4. 'Security Analysis' of the AEGIS spec [0]
		 *
		 * "3. If verification fails, the decrypted plaintext and the
		 *     wrong authentication tag should not be given as output."
		 *
		 * [0] https://competitions.cr.yp.to/round3/aegisv11.pdf
		 */
		skcipher_walk_aead_decrypt(&walk, req, false);
		crypto_aegis128_process_crypt(NULL, &walk,
					      crypto_aegis128_wipe_chunk);
		memzero_explicit(&tag, sizeof(tag));
		return -EBADMSG;
	}
	return 0;
}

static int crypto_aegis128_encrypt_simd(struct aead_request *req)
{
	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	union aegis_block tag = {};
	unsigned int authsize = crypto_aead_authsize(tfm);
	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	unsigned int cryptlen = req->cryptlen;
	struct skcipher_walk walk;
	struct aegis_state state;

	if (!aegis128_do_simd())
		return crypto_aegis128_encrypt_generic(req);

	skcipher_walk_aead_encrypt(&walk, req, false);
	crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
	crypto_aegis128_process_ad(&state, req->src, req->assoclen, true);
	crypto_aegis128_process_crypt(&state, &walk,
				      crypto_aegis128_encrypt_chunk_simd);
	crypto_aegis128_final_simd(&state, &tag, req->assoclen, cryptlen, 0);

	scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
				 authsize, 1);
	return 0;
}

static int crypto_aegis128_decrypt_simd(struct aead_request *req)
{
	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	union aegis_block tag;
	unsigned int authsize = crypto_aead_authsize(tfm);
	unsigned int cryptlen = req->cryptlen - authsize;
	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	struct skcipher_walk walk;
	struct aegis_state state;

	if (!aegis128_do_simd())
		return crypto_aegis128_decrypt_generic(req);

	scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
				 authsize, 0);

	skcipher_walk_aead_decrypt(&walk, req, false);
	crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
	crypto_aegis128_process_ad(&state, req->src, req->assoclen, true);
	crypto_aegis128_process_crypt(&state, &walk,
				      crypto_aegis128_decrypt_chunk_simd);

	if (unlikely(crypto_aegis128_final_simd(&state, &tag, req->assoclen,
						cryptlen, authsize))) {
		skcipher_walk_aead_decrypt(&walk, req, false);
		crypto_aegis128_process_crypt(NULL, &walk,
					      crypto_aegis128_wipe_chunk);
		return -EBADMSG;
	}
	return 0;
}

static struct aead_alg crypto_aegis128_alg_generic = {
	.setkey			= crypto_aegis128_setkey,
	.setauthsize		= crypto_aegis128_setauthsize,
	.encrypt		= crypto_aegis128_encrypt_generic,
	.decrypt		= crypto_aegis128_decrypt_generic,

	.ivsize			= AEGIS128_NONCE_SIZE,
	.maxauthsize		= AEGIS128_MAX_AUTH_SIZE,
	.chunksize		= AEGIS_BLOCK_SIZE,

	.base.cra_blocksize	= 1,
	.base.cra_ctxsize	= sizeof(struct aegis_ctx),
	.base.cra_alignmask	= 0,
	.base.cra_priority	= 100,
	.base.cra_name		= "aegis128",
	.base.cra_driver_name	= "aegis128-generic",
	.base.cra_module	= THIS_MODULE,
};

static struct aead_alg crypto_aegis128_alg_simd = {
	.setkey			= crypto_aegis128_setkey,
	.setauthsize		= crypto_aegis128_setauthsize,
	.encrypt		= crypto_aegis128_encrypt_simd,
	.decrypt		= crypto_aegis128_decrypt_simd,

	.ivsize			= AEGIS128_NONCE_SIZE,
	.maxauthsize		= AEGIS128_MAX_AUTH_SIZE,
	.chunksize		= AEGIS_BLOCK_SIZE,

	.base.cra_blocksize	= 1,
	.base.cra_ctxsize	= sizeof(struct aegis_ctx),
	.base.cra_alignmask	= 0,
	.base.cra_priority	= 200,
	.base.cra_name		= "aegis128",
	.base.cra_driver_name	= "aegis128-simd",
	.base.cra_module	= THIS_MODULE,
};

static int __init crypto_aegis128_module_init(void)
{
	int ret;

	ret = crypto_register_aead(&crypto_aegis128_alg_generic);
	if (ret)
		return ret;

	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
	    crypto_aegis128_have_simd()) {
		ret = crypto_register_aead(&crypto_aegis128_alg_simd);
		if (ret) {
			crypto_unregister_aead(&crypto_aegis128_alg_generic);
			return ret;
		}
		static_branch_enable(&have_simd);
	}
	return 0;
}

static void __exit crypto_aegis128_module_exit(void)
{
	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
	    crypto_aegis128_have_simd())
		crypto_unregister_aead(&crypto_aegis128_alg_simd);

	crypto_unregister_aead(&crypto_aegis128_alg_generic);
}

subsys_initcall(crypto_aegis128_module_init);
module_exit(crypto_aegis128_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm");
MODULE_ALIAS_CRYPTO("aegis128");
MODULE_ALIAS_CRYPTO("aegis128-generic");
MODULE_ALIAS_CRYPTO("aegis128-simd");
Commit	Line	Data
bb4ce825	1	// SPDX-License-Identifier: GPL-2.0-or-later
f606a88e OM	2	/*
	3	* The AEGIS-128 Authenticated-Encryption Algorithm
	4	*
	5	* Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
	6	* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
f606a88e OM	7	*/
	8
	9	#include <crypto/algapi.h>
	10	#include <crypto/internal/aead.h>
cf3d41ad	11	#include <crypto/internal/simd.h>
f606a88e OM	12	#include <crypto/internal/skcipher.h>
	13	#include <crypto/scatterwalk.h>
	14	#include <linux/err.h>
	15	#include <linux/init.h>
2698bce1	16	#include <linux/jump_label.h>
f606a88e OM	17	#include <linux/kernel.h>
	18	#include <linux/module.h>
	19	#include <linux/scatterlist.h>
	20
cf3d41ad AB	21	#include <asm/simd.h>
cf3d41ad AB	22
f606a88e OM	23	#include "aegis.h"
	24
	25	#define AEGIS128_NONCE_SIZE 16
	26	#define AEGIS128_STATE_BLOCKS 5
	27	#define AEGIS128_KEY_SIZE 16
	28	#define AEGIS128_MIN_AUTH_SIZE 8
	29	#define AEGIS128_MAX_AUTH_SIZE 16
	30
	31	struct aegis_state {
	32	union aegis_block blocks[AEGIS128_STATE_BLOCKS];
	33	};
	34
	35	struct aegis_ctx {
	36	union aegis_block key;
	37	};
	38
2698bce1	39	static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_simd);
cf3d41ad	40
f1d087b9 Y	41	static const union aegis_block crypto_aegis_const[2] = {
	42	{ .words64 = {
	43	cpu_to_le64(U64_C(0x0d08050302010100)),
	44	cpu_to_le64(U64_C(0x6279e99059372215)),
	45	} },
	46	{ .words64 = {
	47	cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
	48	cpu_to_le64(U64_C(0xdd28b57342311120)),
	49	} },
	50	};
	51
cf3d41ad AB	52	static bool aegis128_do_simd(void)
	53	{
	54	#ifdef CONFIG_CRYPTO_AEGIS128_SIMD
2698bce1	55	if (static_branch_likely(&have_simd))
cf3d41ad AB	56	return crypto_simd_usable();
	57	#endif
	58	return false;
	59	}
	60
f606a88e OM	61	static void crypto_aegis128_update(struct aegis_state *state)
	62	{
	63	union aegis_block tmp;
	64	unsigned int i;
	65
	66	tmp = state->blocks[AEGIS128_STATE_BLOCKS - 1];
	67	for (i = AEGIS128_STATE_BLOCKS - 1; i > 0; i--)
	68	crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
	69	&state->blocks[i]);
	70	crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
	71	}
	72
	73	static void crypto_aegis128_update_a(struct aegis_state *state,
ac50aec4 AB	74	const union aegis_block *msg,
ac50aec4 AB	75	bool do_simd)
f606a88e	76	{
0464e0ef	77	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
cf3d41ad AB	78	crypto_aegis128_update_simd(state, msg);
	79	return;
	80	}
	81
f606a88e OM	82	crypto_aegis128_update(state);
	83	crypto_aegis_block_xor(&state->blocks[0], msg);
	84	}
	85
ac50aec4 AB	86	static void crypto_aegis128_update_u(struct aegis_state state, const void msg,
ac50aec4 AB	87	bool do_simd)
f606a88e	88	{
0464e0ef	89	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
cf3d41ad AB	90	crypto_aegis128_update_simd(state, msg);
	91	return;
	92	}
	93
f606a88e OM	94	crypto_aegis128_update(state);
	95	crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
	96	}
	97
	98	static void crypto_aegis128_init(struct aegis_state *state,
	99	const union aegis_block *key,
	100	const u8 *iv)
	101	{
	102	union aegis_block key_iv;
	103	unsigned int i;
	104
	105	key_iv = *key;
	106	crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE);
	107
	108	state->blocks[0] = key_iv;
	109	state->blocks[1] = crypto_aegis_const[1];
	110	state->blocks[2] = crypto_aegis_const[0];
	111	state->blocks[3] = *key;
	112	state->blocks[4] = *key;
	113
	114	crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]);
	115	crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]);
	116
	117	for (i = 0; i < 5; i++) {
ac50aec4 AB	118	crypto_aegis128_update_a(state, key, false);
ac50aec4 AB	119	crypto_aegis128_update_a(state, &key_iv, false);
f606a88e OM	120	}
	121	}
	122
	123	static void crypto_aegis128_ad(struct aegis_state *state,
ac50aec4 AB	124	const u8 *src, unsigned int size,
ac50aec4 AB	125	bool do_simd)
f606a88e OM	126	{
	127	if (AEGIS_ALIGNED(src)) {
	128	const union aegis_block *src_blk =
	129	(const union aegis_block *)src;
	130
	131	while (size >= AEGIS_BLOCK_SIZE) {
ac50aec4	132	crypto_aegis128_update_a(state, src_blk, do_simd);
f606a88e OM	133
	134	size -= AEGIS_BLOCK_SIZE;
	135	src_blk++;
	136	}
	137	} else {
	138	while (size >= AEGIS_BLOCK_SIZE) {
ac50aec4	139	crypto_aegis128_update_u(state, src, do_simd);
f606a88e OM	140
	141	size -= AEGIS_BLOCK_SIZE;
	142	src += AEGIS_BLOCK_SIZE;
	143	}
	144	}
	145	}
	146
02685906 AB	147	static void crypto_aegis128_wipe_chunk(struct aegis_state state, u8 dst,
	148	const u8 *src, unsigned int size)
	149	{
	150	memzero_explicit(dst, size);
	151	}
	152
f606a88e OM	153	static void crypto_aegis128_encrypt_chunk(struct aegis_state state, u8 dst,
	154	const u8 *src, unsigned int size)
	155	{
	156	union aegis_block tmp;
	157
	158	if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
	159	while (size >= AEGIS_BLOCK_SIZE) {
	160	union aegis_block *dst_blk =
	161	(union aegis_block *)dst;
	162	const union aegis_block *src_blk =
	163	(const union aegis_block *)src;
	164
	165	tmp = state->blocks[2];
	166	crypto_aegis_block_and(&tmp, &state->blocks[3]);
	167	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
	168	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
	169	crypto_aegis_block_xor(&tmp, src_blk);
	170
ac50aec4	171	crypto_aegis128_update_a(state, src_blk, false);
f606a88e OM	172
	173	*dst_blk = tmp;
	174
	175	size -= AEGIS_BLOCK_SIZE;
	176	src += AEGIS_BLOCK_SIZE;
	177	dst += AEGIS_BLOCK_SIZE;
	178	}
	179	} else {
	180	while (size >= AEGIS_BLOCK_SIZE) {
	181	tmp = state->blocks[2];
	182	crypto_aegis_block_and(&tmp, &state->blocks[3]);
	183	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
	184	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
	185	crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
	186
ac50aec4	187	crypto_aegis128_update_u(state, src, false);
f606a88e OM	188
	189	memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
	190
	191	size -= AEGIS_BLOCK_SIZE;
	192	src += AEGIS_BLOCK_SIZE;
	193	dst += AEGIS_BLOCK_SIZE;
	194	}
	195	}
	196
	197	if (size > 0) {
	198	union aegis_block msg = {};
	199	memcpy(msg.bytes, src, size);
	200
	201	tmp = state->blocks[2];
	202	crypto_aegis_block_and(&tmp, &state->blocks[3]);
	203	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
	204	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
	205
ac50aec4	206	crypto_aegis128_update_a(state, &msg, false);
f606a88e OM	207
	208	crypto_aegis_block_xor(&msg, &tmp);
	209
	210	memcpy(dst, msg.bytes, size);
	211	}
	212	}
	213
	214	static void crypto_aegis128_decrypt_chunk(struct aegis_state state, u8 dst,
	215	const u8 *src, unsigned int size)
	216	{
	217	union aegis_block tmp;
	218
	219	if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
	220	while (size >= AEGIS_BLOCK_SIZE) {
	221	union aegis_block *dst_blk =
	222	(union aegis_block *)dst;
	223	const union aegis_block *src_blk =
	224	(const union aegis_block *)src;
	225
	226	tmp = state->blocks[2];
	227	crypto_aegis_block_and(&tmp, &state->blocks[3]);
	228	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
	229	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
	230	crypto_aegis_block_xor(&tmp, src_blk);
	231
ac50aec4	232	crypto_aegis128_update_a(state, &tmp, false);
f606a88e OM	233
	234	*dst_blk = tmp;
	235
	236	size -= AEGIS_BLOCK_SIZE;
	237	src += AEGIS_BLOCK_SIZE;
	238	dst += AEGIS_BLOCK_SIZE;
	239	}
	240	} else {
	241	while (size >= AEGIS_BLOCK_SIZE) {
	242	tmp = state->blocks[2];
	243	crypto_aegis_block_and(&tmp, &state->blocks[3]);
	244	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
	245	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
	246	crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
	247
ac50aec4	248	crypto_aegis128_update_a(state, &tmp, false);
f606a88e OM	249
	250	memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
	251
	252	size -= AEGIS_BLOCK_SIZE;
	253	src += AEGIS_BLOCK_SIZE;
	254	dst += AEGIS_BLOCK_SIZE;
	255	}
	256	}
	257
	258	if (size > 0) {
	259	union aegis_block msg = {};
	260	memcpy(msg.bytes, src, size);
	261
	262	tmp = state->blocks[2];
	263	crypto_aegis_block_and(&tmp, &state->blocks[3]);
	264	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
	265	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
	266	crypto_aegis_block_xor(&msg, &tmp);
	267
	268	memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);
	269
ac50aec4	270	crypto_aegis128_update_a(state, &msg, false);
f606a88e OM	271
	272	memcpy(dst, msg.bytes, size);
	273	}
	274	}
	275
	276	static void crypto_aegis128_process_ad(struct aegis_state *state,
	277	struct scatterlist *sg_src,
ac50aec4 AB	278	unsigned int assoclen,
ac50aec4 AB	279	bool do_simd)
f606a88e OM	280	{
	281	struct scatter_walk walk;
	282	union aegis_block buf;
	283	unsigned int pos = 0;
	284
	285	scatterwalk_start(&walk, sg_src);
	286	while (assoclen != 0) {
	287	unsigned int size = scatterwalk_clamp(&walk, assoclen);
	288	unsigned int left = size;
	289	void *mapped = scatterwalk_map(&walk);
	290	const u8 src = (const u8 )mapped;
	291
	292	if (pos + size >= AEGIS_BLOCK_SIZE) {
	293	if (pos > 0) {
	294	unsigned int fill = AEGIS_BLOCK_SIZE - pos;
	295	memcpy(buf.bytes + pos, src, fill);
ac50aec4	296	crypto_aegis128_update_a(state, &buf, do_simd);
f606a88e OM	297	pos = 0;
	298	left -= fill;
	299	src += fill;
	300	}
	301
ac50aec4	302	crypto_aegis128_ad(state, src, left, do_simd);
f606a88e OM	303	src += left & ~(AEGIS_BLOCK_SIZE - 1);
	304	left &= AEGIS_BLOCK_SIZE - 1;
	305	}
	306
	307	memcpy(buf.bytes + pos, src, left);
	308
	309	pos += left;
	310	assoclen -= size;
	311	scatterwalk_unmap(mapped);
	312	scatterwalk_advance(&walk, size);
	313	scatterwalk_done(&walk, 0, assoclen);
	314	}
	315
	316	if (pos > 0) {
	317	memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
ac50aec4	318	crypto_aegis128_update_a(state, &buf, do_simd);
f606a88e OM	319	}
	320	}
	321
2698bce1 AB	322	static __always_inline
2698bce1 AB	323	int crypto_aegis128_process_crypt(struct aegis_state *state,
2698bce1 AB	324	struct skcipher_walk *walk,
	325	void (crypt)(struct aegis_state state,
	326	u8 dst, const u8 src,
	327	unsigned int size))
f606a88e	328	{
2698bce1	329	int err = 0;
f606a88e	330
2698bce1 AB	331	while (walk->nbytes) {
2698bce1 AB	332	unsigned int nbytes = walk->nbytes;
f606a88e	333
2698bce1 AB	334	if (nbytes < walk->total)
2698bce1 AB	335	nbytes = round_down(nbytes, walk->stride);
f606a88e	336
2698bce1	337	crypt(state, walk->dst.virt.addr, walk->src.virt.addr, nbytes);
f606a88e	338
2698bce1	339	err = skcipher_walk_done(walk, walk->nbytes - nbytes);
f606a88e	340	}
2698bce1	341	return err;
f606a88e OM	342	}
	343
	344	static void crypto_aegis128_final(struct aegis_state *state,
	345	union aegis_block *tag_xor,
	346	u64 assoclen, u64 cryptlen)
	347	{
	348	u64 assocbits = assoclen * 8;
	349	u64 cryptbits = cryptlen * 8;
	350
	351	union aegis_block tmp;
	352	unsigned int i;
	353
	354	tmp.words64[0] = cpu_to_le64(assocbits);
	355	tmp.words64[1] = cpu_to_le64(cryptbits);
	356
	357	crypto_aegis_block_xor(&tmp, &state->blocks[3]);
	358
	359	for (i = 0; i < 7; i++)
ac50aec4	360	crypto_aegis128_update_a(state, &tmp, false);
f606a88e OM	361
	362	for (i = 0; i < AEGIS128_STATE_BLOCKS; i++)
	363	crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
	364	}
	365
	366	static int crypto_aegis128_setkey(struct crypto_aead aead, const u8 key,
	367	unsigned int keylen)
	368	{
	369	struct aegis_ctx *ctx = crypto_aead_ctx(aead);
	370
674f368a	371	if (keylen != AEGIS128_KEY_SIZE)
f606a88e	372	return -EINVAL;
f606a88e OM	373
	374	memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
	375	return 0;
	376	}
	377
	378	static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,
	379	unsigned int authsize)
	380	{
	381	if (authsize > AEGIS128_MAX_AUTH_SIZE)
	382	return -EINVAL;
	383	if (authsize < AEGIS128_MIN_AUTH_SIZE)
	384	return -EINVAL;
	385	return 0;
	386	}
	387
ac50aec4	388	static int crypto_aegis128_encrypt_generic(struct aead_request *req)
f606a88e OM	389	{
f606a88e OM	390	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
2698bce1 AB	391	union aegis_block tag = {};
2698bce1 AB	392	unsigned int authsize = crypto_aead_authsize(tfm);
f606a88e	393	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
2698bce1 AB	394	unsigned int cryptlen = req->cryptlen;
2698bce1 AB	395	struct skcipher_walk walk;
f606a88e OM	396	struct aegis_state state;
f606a88e OM	397
2698bce1	398	skcipher_walk_aead_encrypt(&walk, req, false);
ac50aec4 AB	399	crypto_aegis128_init(&state, &ctx->key, req->iv);
	400	crypto_aegis128_process_ad(&state, req->src, req->assoclen, false);
	401	crypto_aegis128_process_crypt(&state, &walk,
	402	crypto_aegis128_encrypt_chunk);
	403	crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
f606a88e OM	404
	405	scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
	406	authsize, 1);
	407	return 0;
	408	}
	409
ac50aec4	410	static int crypto_aegis128_decrypt_generic(struct aead_request *req)
f606a88e	411	{
f606a88e	412	static const u8 zeros[AEGIS128_MAX_AUTH_SIZE] = {};
f606a88e OM	413	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	414	union aegis_block tag;
	415	unsigned int authsize = crypto_aead_authsize(tfm);
	416	unsigned int cryptlen = req->cryptlen - authsize;
2698bce1 AB	417	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	418	struct skcipher_walk walk;
	419	struct aegis_state state;
f606a88e OM	420
	421	scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
	422	authsize, 0);
	423
2698bce1	424	skcipher_walk_aead_decrypt(&walk, req, false);
ac50aec4 AB	425	crypto_aegis128_init(&state, &ctx->key, req->iv);
	426	crypto_aegis128_process_ad(&state, req->src, req->assoclen, false);
	427	crypto_aegis128_process_crypt(&state, &walk,
	428	crypto_aegis128_decrypt_chunk);
	429	crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
f606a88e	430
02685906 AB	431	if (unlikely(crypto_memneq(tag.bytes, zeros, authsize))) {
	432	/*
	433	* From Chapter 4. 'Security Analysis' of the AEGIS spec [0]
	434	*
	435	* "3. If verification fails, the decrypted plaintext and the
	436	* wrong authentication tag should not be given as output."
	437	*
	438	* [0] https://competitions.cr.yp.to/round3/aegisv11.pdf
	439	*/
	440	skcipher_walk_aead_decrypt(&walk, req, false);
	441	crypto_aegis128_process_crypt(NULL, &walk,
	442	crypto_aegis128_wipe_chunk);
	443	memzero_explicit(&tag, sizeof(tag));
	444	return -EBADMSG;
	445	}
	446	return 0;
f606a88e OM	447	}
f606a88e OM	448
ac50aec4 AB	449	static int crypto_aegis128_encrypt_simd(struct aead_request *req)
	450	{
	451	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	452	union aegis_block tag = {};
	453	unsigned int authsize = crypto_aead_authsize(tfm);
	454	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	455	unsigned int cryptlen = req->cryptlen;
	456	struct skcipher_walk walk;
	457	struct aegis_state state;
f606a88e	458
ac50aec4 AB	459	if (!aegis128_do_simd())
ac50aec4 AB	460	return crypto_aegis128_encrypt_generic(req);
f606a88e	461
ac50aec4 AB	462	skcipher_walk_aead_encrypt(&walk, req, false);
	463	crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
	464	crypto_aegis128_process_ad(&state, req->src, req->assoclen, true);
	465	crypto_aegis128_process_crypt(&state, &walk,
	466	crypto_aegis128_encrypt_chunk_simd);
	467	crypto_aegis128_final_simd(&state, &tag, req->assoclen, cryptlen, 0);
f606a88e	468
ac50aec4 AB	469	scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
	470	authsize, 1);
	471	return 0;
	472	}
f606a88e	473
ac50aec4 AB	474	static int crypto_aegis128_decrypt_simd(struct aead_request *req)
	475	{
	476	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	477	union aegis_block tag;
	478	unsigned int authsize = crypto_aead_authsize(tfm);
	479	unsigned int cryptlen = req->cryptlen - authsize;
	480	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	481	struct skcipher_walk walk;
	482	struct aegis_state state;
f606a88e	483
ac50aec4 AB	484	if (!aegis128_do_simd())
	485	return crypto_aegis128_decrypt_generic(req);
	486
	487	scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
	488	authsize, 0);
	489
	490	skcipher_walk_aead_decrypt(&walk, req, false);
	491	crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
	492	crypto_aegis128_process_ad(&state, req->src, req->assoclen, true);
	493	crypto_aegis128_process_crypt(&state, &walk,
	494	crypto_aegis128_decrypt_chunk_simd);
	495
	496	if (unlikely(crypto_aegis128_final_simd(&state, &tag, req->assoclen,
	497	cryptlen, authsize))) {
	498	skcipher_walk_aead_decrypt(&walk, req, false);
	499	crypto_aegis128_process_crypt(NULL, &walk,
	500	crypto_aegis128_wipe_chunk);
	501	return -EBADMSG;
f606a88e	502	}
ac50aec4 AB	503	return 0;
	504	}
	505
	506	static struct aead_alg crypto_aegis128_alg_generic = {
	507	.setkey = crypto_aegis128_setkey,
	508	.setauthsize = crypto_aegis128_setauthsize,
	509	.encrypt = crypto_aegis128_encrypt_generic,
	510	.decrypt = crypto_aegis128_decrypt_generic,
	511
	512	.ivsize = AEGIS128_NONCE_SIZE,
	513	.maxauthsize = AEGIS128_MAX_AUTH_SIZE,
	514	.chunksize = AEGIS_BLOCK_SIZE,
	515
	516	.base.cra_blocksize = 1,
	517	.base.cra_ctxsize = sizeof(struct aegis_ctx),
	518	.base.cra_alignmask = 0,
	519	.base.cra_priority = 100,
	520	.base.cra_name = "aegis128",
	521	.base.cra_driver_name = "aegis128-generic",
	522	.base.cra_module = THIS_MODULE,
	523	};
	524
	525	static struct aead_alg crypto_aegis128_alg_simd = {
	526	.setkey = crypto_aegis128_setkey,
	527	.setauthsize = crypto_aegis128_setauthsize,
	528	.encrypt = crypto_aegis128_encrypt_simd,
	529	.decrypt = crypto_aegis128_decrypt_simd,
	530
	531	.ivsize = AEGIS128_NONCE_SIZE,
	532	.maxauthsize = AEGIS128_MAX_AUTH_SIZE,
	533	.chunksize = AEGIS_BLOCK_SIZE,
	534
	535	.base.cra_blocksize = 1,
	536	.base.cra_ctxsize = sizeof(struct aegis_ctx),
	537	.base.cra_alignmask = 0,
	538	.base.cra_priority = 200,
	539	.base.cra_name = "aegis128",
	540	.base.cra_driver_name = "aegis128-simd",
	541	.base.cra_module = THIS_MODULE,
f606a88e OM	542	};
	543
	544	static int __init crypto_aegis128_module_init(void)
	545	{
ac50aec4 AB	546	int ret;
	547
	548	ret = crypto_register_aead(&crypto_aegis128_alg_generic);
	549	if (ret)
	550	return ret;
	551
2698bce1	552	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
ac50aec4 AB	553	crypto_aegis128_have_simd()) {
	554	ret = crypto_register_aead(&crypto_aegis128_alg_simd);
	555	if (ret) {
	556	crypto_unregister_aead(&crypto_aegis128_alg_generic);
	557	return ret;
	558	}
2698bce1	559	static_branch_enable(&have_simd);
ac50aec4 AB	560	}
ac50aec4 AB	561	return 0;
f606a88e OM	562	}
	563
	564	static void __exit crypto_aegis128_module_exit(void)
	565	{
ac50aec4 AB	566	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
	567	crypto_aegis128_have_simd())
	568	crypto_unregister_aead(&crypto_aegis128_alg_simd);
	569
	570	crypto_unregister_aead(&crypto_aegis128_alg_generic);
f606a88e OM	571	}
f606a88e OM	572
c4741b23	573	subsys_initcall(crypto_aegis128_module_init);
f606a88e OM	574	module_exit(crypto_aegis128_module_exit);
	575
	576	MODULE_LICENSE("GPL");
	577	MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
	578	MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm");
	579	MODULE_ALIAS_CRYPTO("aegis128");
	580	MODULE_ALIAS_CRYPTO("aegis128-generic");
ac50aec4	581	MODULE_ALIAS_CRYPTO("aegis128-simd");