[linux-2.6-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;
}

bool crypto_aegis128_have_simd(void);
void crypto_aegis128_update_simd(struct aegis_state *state, const void *msg);
void crypto_aegis128_init_simd(struct aegis_state *state,
			       const union aegis_block *key,
			       const u8 *iv);
void crypto_aegis128_encrypt_chunk_simd(struct aegis_state *state, u8 *dst,
					const u8 *src, unsigned int size);
void crypto_aegis128_decrypt_chunk_simd(struct aegis_state *state, u8 *dst,
					const u8 *src, unsigned int size);
void crypto_aegis128_final_simd(struct aegis_state *state,
				union aegis_block *tag_xor,
				u64 assoclen, u64 cryptlen);

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)
{
	if (aegis128_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)
{
	if (aegis128_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);
		crypto_aegis128_update_a(state, &key_iv);
	}
}

static void crypto_aegis128_ad(struct aegis_state *state,
			       const u8 *src, unsigned int size)
{
	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);

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

			size -= AEGIS_BLOCK_SIZE;
			src += AEGIS_BLOCK_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);

			*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);

			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);

		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);

			*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);

			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);

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

static void crypto_aegis128_process_ad(struct aegis_state *state,
				       struct scatterlist *sg_src,
				       unsigned int assoclen)
{
	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);
				pos = 0;
				left -= fill;
				src += fill;
			}

			crypto_aegis128_ad(state, src, left);
			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);
	}
}

static __always_inline
int crypto_aegis128_process_crypt(struct aegis_state *state,
				  struct aead_request *req,
				  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);

	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) {
		crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
		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(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);
	if (aegis128_do_simd()) {
		crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
		crypto_aegis128_process_ad(&state, req->src, req->assoclen);
		crypto_aegis128_process_crypt(&state, req, &walk,
					      crypto_aegis128_encrypt_chunk_simd);
		crypto_aegis128_final_simd(&state, &tag, req->assoclen,
					   cryptlen);
	} else {
		crypto_aegis128_init(&state, &ctx->key, req->iv);
		crypto_aegis128_process_ad(&state, req->src, req->assoclen);
		crypto_aegis128_process_crypt(&state, req, &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(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);
	if (aegis128_do_simd()) {
		crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
		crypto_aegis128_process_ad(&state, req->src, req->assoclen);
		crypto_aegis128_process_crypt(&state, req, &walk,
					      crypto_aegis128_decrypt_chunk_simd);
		crypto_aegis128_final_simd(&state, &tag, req->assoclen,
					   cryptlen);
	} else {
		crypto_aegis128_init(&state, &ctx->key, req->iv);
		crypto_aegis128_process_ad(&state, req->src, req->assoclen);
		crypto_aegis128_process_crypt(&state, req, &walk,
					      crypto_aegis128_decrypt_chunk);
		crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
	}

	return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
}

static struct aead_alg crypto_aegis128_alg = {
	.setkey = crypto_aegis128_setkey,
	.setauthsize = crypto_aegis128_setauthsize,
	.encrypt = crypto_aegis128_encrypt,
	.decrypt = crypto_aegis128_decrypt,

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

	.base = {
		.cra_blocksize = 1,
		.cra_ctxsize = sizeof(struct aegis_ctx),
		.cra_alignmask = 0,

		.cra_priority = 100,

		.cra_name = "aegis128",
		.cra_driver_name = "aegis128-generic",

		.cra_module = THIS_MODULE,
	}
};

static int __init crypto_aegis128_module_init(void)
{
	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
	    crypto_aegis128_have_simd())
		static_branch_enable(&have_simd);

	return crypto_register_aead(&crypto_aegis128_alg);
}

static void __exit crypto_aegis128_module_exit(void)
{
	crypto_unregister_aead(&crypto_aegis128_alg);
}

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");
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
	61	bool crypto_aegis128_have_simd(void);
	62	void crypto_aegis128_update_simd(struct aegis_state state, const void msg);
52828263 AB	63	void crypto_aegis128_init_simd(struct aegis_state *state,
	64	const union aegis_block *key,
	65	const u8 *iv);
cf3d41ad AB	66	void crypto_aegis128_encrypt_chunk_simd(struct aegis_state state, u8 dst,
	67	const u8 *src, unsigned int size);
	68	void crypto_aegis128_decrypt_chunk_simd(struct aegis_state state, u8 dst,
	69	const u8 *src, unsigned int size);
52828263 AB	70	void crypto_aegis128_final_simd(struct aegis_state *state,
	71	union aegis_block *tag_xor,
	72	u64 assoclen, u64 cryptlen);
cf3d41ad	73
f606a88e OM	74	static void crypto_aegis128_update(struct aegis_state *state)
	75	{
	76	union aegis_block tmp;
	77	unsigned int i;
	78
	79	tmp = state->blocks[AEGIS128_STATE_BLOCKS - 1];
	80	for (i = AEGIS128_STATE_BLOCKS - 1; i > 0; i--)
	81	crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
	82	&state->blocks[i]);
	83	crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
	84	}
	85
	86	static void crypto_aegis128_update_a(struct aegis_state *state,
	87	const union aegis_block *msg)
	88	{
cf3d41ad AB	89	if (aegis128_do_simd()) {
	90	crypto_aegis128_update_simd(state, msg);
	91	return;
	92	}
	93
f606a88e OM	94	crypto_aegis128_update(state);
	95	crypto_aegis_block_xor(&state->blocks[0], msg);
	96	}
	97
	98	static void crypto_aegis128_update_u(struct aegis_state state, const void msg)
	99	{
cf3d41ad AB	100	if (aegis128_do_simd()) {
	101	crypto_aegis128_update_simd(state, msg);
	102	return;
	103	}
	104
f606a88e OM	105	crypto_aegis128_update(state);
	106	crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
	107	}
	108
	109	static void crypto_aegis128_init(struct aegis_state *state,
	110	const union aegis_block *key,
	111	const u8 *iv)
	112	{
	113	union aegis_block key_iv;
	114	unsigned int i;
	115
	116	key_iv = *key;
	117	crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE);
	118
	119	state->blocks[0] = key_iv;
	120	state->blocks[1] = crypto_aegis_const[1];
	121	state->blocks[2] = crypto_aegis_const[0];
	122	state->blocks[3] = *key;
	123	state->blocks[4] = *key;
	124
	125	crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]);
	126	crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]);
	127
	128	for (i = 0; i < 5; i++) {
	129	crypto_aegis128_update_a(state, key);
	130	crypto_aegis128_update_a(state, &key_iv);
	131	}
	132	}
	133
	134	static void crypto_aegis128_ad(struct aegis_state *state,
	135	const u8 *src, unsigned int size)
	136	{
	137	if (AEGIS_ALIGNED(src)) {
	138	const union aegis_block *src_blk =
	139	(const union aegis_block *)src;
	140
	141	while (size >= AEGIS_BLOCK_SIZE) {
	142	crypto_aegis128_update_a(state, src_blk);
	143
	144	size -= AEGIS_BLOCK_SIZE;
	145	src_blk++;
	146	}
	147	} else {
	148	while (size >= AEGIS_BLOCK_SIZE) {
	149	crypto_aegis128_update_u(state, src);
	150
	151	size -= AEGIS_BLOCK_SIZE;
	152	src += AEGIS_BLOCK_SIZE;
	153	}
	154	}
	155	}
	156
	157	static void crypto_aegis128_encrypt_chunk(struct aegis_state state, u8 dst,
	158	const u8 *src, unsigned int size)
	159	{
	160	union aegis_block tmp;
	161
	162	if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
	163	while (size >= AEGIS_BLOCK_SIZE) {
	164	union aegis_block *dst_blk =
	165	(union aegis_block *)dst;
	166	const union aegis_block *src_blk =
	167	(const union aegis_block *)src;
	168
169	tmp = state->blocks[2];
170	crypto_aegis_block_and(&tmp, &state->blocks[3]);
171	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
172	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
173	crypto_aegis_block_xor(&tmp, src_blk);
174
175	crypto_aegis128_update_a(state, src_blk);
176
177	*dst_blk = tmp;
178
179	size -= AEGIS_BLOCK_SIZE;
180	src += AEGIS_BLOCK_SIZE;
181	dst += AEGIS_BLOCK_SIZE;
182	}
183	} else {
184	while (size >= AEGIS_BLOCK_SIZE) {
185	tmp = state->blocks[2];
186	crypto_aegis_block_and(&tmp, &state->blocks[3]);
187	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
188	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
189	crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
190
191	crypto_aegis128_update_u(state, src);
192
193	memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
194
195	size -= AEGIS_BLOCK_SIZE;
196	src += AEGIS_BLOCK_SIZE;
197	dst += AEGIS_BLOCK_SIZE;
198	}
199	}
200
201	if (size > 0) {
202	union aegis_block msg = {};
203	memcpy(msg.bytes, src, size);
204
205	tmp = state->blocks[2];
206	crypto_aegis_block_and(&tmp, &state->blocks[3]);
207	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
208	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
209
210	crypto_aegis128_update_a(state, &msg);
211
212	crypto_aegis_block_xor(&msg, &tmp);
213
214	memcpy(dst, msg.bytes, size);
215	}
216	}
217
218	static void crypto_aegis128_decrypt_chunk(struct aegis_state state, u8 dst,
219	const u8 *src, unsigned int size)
220	{
221	union aegis_block tmp;
222
223	if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
224	while (size >= AEGIS_BLOCK_SIZE) {
225	union aegis_block *dst_blk =
226	(union aegis_block *)dst;
227	const union aegis_block *src_blk =
228	(const union aegis_block *)src;
229
230	tmp = state->blocks[2];
231	crypto_aegis_block_and(&tmp, &state->blocks[3]);
232	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
233	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
234	crypto_aegis_block_xor(&tmp, src_blk);
235
236	crypto_aegis128_update_a(state, &tmp);
237
238	*dst_blk = tmp;
239
240	size -= AEGIS_BLOCK_SIZE;
241	src += AEGIS_BLOCK_SIZE;
242	dst += AEGIS_BLOCK_SIZE;
243	}
244	} else {
245	while (size >= AEGIS_BLOCK_SIZE) {
246	tmp = state->blocks[2];
247	crypto_aegis_block_and(&tmp, &state->blocks[3]);
248	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
249	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
250	crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
251
252	crypto_aegis128_update_a(state, &tmp);
253
254	memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
255
256	size -= AEGIS_BLOCK_SIZE;
257	src += AEGIS_BLOCK_SIZE;
258	dst += AEGIS_BLOCK_SIZE;
259	}
260	}
261
262	if (size > 0) {
263	union aegis_block msg = {};
264	memcpy(msg.bytes, src, size);
265
266	tmp = state->blocks[2];
267	crypto_aegis_block_and(&tmp, &state->blocks[3]);
268	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
269	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
270	crypto_aegis_block_xor(&msg, &tmp);
271
272	memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);
273
274	crypto_aegis128_update_a(state, &msg);
275
276	memcpy(dst, msg.bytes, size);
277	}
278	}
279
280	static void crypto_aegis128_process_ad(struct aegis_state *state,
281	struct scatterlist *sg_src,
282	unsigned int assoclen)
283	{
284	struct scatter_walk walk;
285	union aegis_block buf;
286	unsigned int pos = 0;
287
288	scatterwalk_start(&walk, sg_src);
289	while (assoclen != 0) {
290	unsigned int size = scatterwalk_clamp(&walk, assoclen);
291	unsigned int left = size;
292	void *mapped = scatterwalk_map(&walk);
293	const u8 src = (const u8 )mapped;
294
295	if (pos + size >= AEGIS_BLOCK_SIZE) {
296	if (pos > 0) {
297	unsigned int fill = AEGIS_BLOCK_SIZE - pos;
298	memcpy(buf.bytes + pos, src, fill);
299	crypto_aegis128_update_a(state, &buf);
300	pos = 0;
301	left -= fill;
302	src += fill;
303	}
304
305	crypto_aegis128_ad(state, src, left);
306	src += left & ~(AEGIS_BLOCK_SIZE - 1);
307	left &= AEGIS_BLOCK_SIZE - 1;
308	}
309
310	memcpy(buf.bytes + pos, src, left);
311
312	pos += left;
313	assoclen -= size;
314	scatterwalk_unmap(mapped);
315	scatterwalk_advance(&walk, size);
316	scatterwalk_done(&walk, 0, assoclen);
317	}
318
319	if (pos > 0) {
320	memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
321	crypto_aegis128_update_a(state, &buf);
322	}
323	}
324
2698bce1 AB	325	static __always_inline
	326	int crypto_aegis128_process_crypt(struct aegis_state *state,
	327	struct aead_request *req,
	328	struct skcipher_walk *walk,
	329	void (crypt)(struct aegis_state state,
	330	u8 dst, const u8 src,
	331	unsigned int size))
f606a88e	332	{
2698bce1	333	int err = 0;
f606a88e	334
2698bce1 AB	335	while (walk->nbytes) {
2698bce1 AB	336	unsigned int nbytes = walk->nbytes;
f606a88e	337
2698bce1 AB	338	if (nbytes < walk->total)
2698bce1 AB	339	nbytes = round_down(nbytes, walk->stride);
f606a88e	340
2698bce1	341	crypt(state, walk->dst.virt.addr, walk->src.virt.addr, nbytes);
f606a88e	342
2698bce1	343	err = skcipher_walk_done(walk, walk->nbytes - nbytes);
f606a88e	344	}
2698bce1	345	return err;
f606a88e OM	346	}
	347
	348	static void crypto_aegis128_final(struct aegis_state *state,
	349	union aegis_block *tag_xor,
	350	u64 assoclen, u64 cryptlen)
	351	{
	352	u64 assocbits = assoclen * 8;
	353	u64 cryptbits = cryptlen * 8;
	354
	355	union aegis_block tmp;
	356	unsigned int i;
	357
	358	tmp.words64[0] = cpu_to_le64(assocbits);
	359	tmp.words64[1] = cpu_to_le64(cryptbits);
	360
	361	crypto_aegis_block_xor(&tmp, &state->blocks[3]);
	362
	363	for (i = 0; i < 7; i++)
	364	crypto_aegis128_update_a(state, &tmp);
	365
	366	for (i = 0; i < AEGIS128_STATE_BLOCKS; i++)
	367	crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
	368	}
	369
	370	static int crypto_aegis128_setkey(struct crypto_aead aead, const u8 key,
	371	unsigned int keylen)
	372	{
	373	struct aegis_ctx *ctx = crypto_aead_ctx(aead);
	374
	375	if (keylen != AEGIS128_KEY_SIZE) {
	376	crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
	377	return -EINVAL;
	378	}
	379
	380	memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
	381	return 0;
	382	}
	383
	384	static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,
	385	unsigned int authsize)
	386	{
	387	if (authsize > AEGIS128_MAX_AUTH_SIZE)
	388	return -EINVAL;
	389	if (authsize < AEGIS128_MIN_AUTH_SIZE)
	390	return -EINVAL;
	391	return 0;
	392	}
	393
2698bce1	394	static int crypto_aegis128_encrypt(struct aead_request *req)
f606a88e OM	395	{
f606a88e OM	396	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
2698bce1 AB	397	union aegis_block tag = {};
2698bce1 AB	398	unsigned int authsize = crypto_aead_authsize(tfm);
f606a88e	399	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
2698bce1 AB	400	unsigned int cryptlen = req->cryptlen;
2698bce1 AB	401	struct skcipher_walk walk;
f606a88e OM	402	struct aegis_state state;
f606a88e OM	403
2698bce1	404	skcipher_walk_aead_encrypt(&walk, req, false);
52828263 AB	405	if (aegis128_do_simd()) {
	406	crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
	407	crypto_aegis128_process_ad(&state, req->src, req->assoclen);
2698bce1 AB	408	crypto_aegis128_process_crypt(&state, req, &walk,
2698bce1 AB	409	crypto_aegis128_encrypt_chunk_simd);
52828263 AB	410	crypto_aegis128_final_simd(&state, &tag, req->assoclen,
	411	cryptlen);
	412	} else {
	413	crypto_aegis128_init(&state, &ctx->key, req->iv);
	414	crypto_aegis128_process_ad(&state, req->src, req->assoclen);
2698bce1 AB	415	crypto_aegis128_process_crypt(&state, req, &walk,
2698bce1 AB	416	crypto_aegis128_encrypt_chunk);
52828263 AB	417	crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
52828263 AB	418	}
f606a88e OM	419
	420	scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
	421	authsize, 1);
	422	return 0;
	423	}
	424
	425	static int crypto_aegis128_decrypt(struct aead_request *req)
	426	{
f606a88e	427	static const u8 zeros[AEGIS128_MAX_AUTH_SIZE] = {};
f606a88e OM	428	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	429	union aegis_block tag;
	430	unsigned int authsize = crypto_aead_authsize(tfm);
	431	unsigned int cryptlen = req->cryptlen - authsize;
2698bce1 AB	432	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	433	struct skcipher_walk walk;
	434	struct aegis_state state;
f606a88e OM	435
	436	scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
	437	authsize, 0);
	438
2698bce1	439	skcipher_walk_aead_decrypt(&walk, req, false);
52828263 AB	440	if (aegis128_do_simd()) {
	441	crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
	442	crypto_aegis128_process_ad(&state, req->src, req->assoclen);
2698bce1 AB	443	crypto_aegis128_process_crypt(&state, req, &walk,
2698bce1 AB	444	crypto_aegis128_decrypt_chunk_simd);
52828263 AB	445	crypto_aegis128_final_simd(&state, &tag, req->assoclen,
	446	cryptlen);
	447	} else {
	448	crypto_aegis128_init(&state, &ctx->key, req->iv);
	449	crypto_aegis128_process_ad(&state, req->src, req->assoclen);
2698bce1 AB	450	crypto_aegis128_process_crypt(&state, req, &walk,
2698bce1 AB	451	crypto_aegis128_decrypt_chunk);
52828263 AB	452	crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
52828263 AB	453	}
f606a88e OM	454
	455	return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
	456	}
	457
f606a88e OM	458	static struct aead_alg crypto_aegis128_alg = {
	459	.setkey = crypto_aegis128_setkey,
	460	.setauthsize = crypto_aegis128_setauthsize,
	461	.encrypt = crypto_aegis128_encrypt,
	462	.decrypt = crypto_aegis128_decrypt,
f606a88e OM	463
	464	.ivsize = AEGIS128_NONCE_SIZE,
	465	.maxauthsize = AEGIS128_MAX_AUTH_SIZE,
	466	.chunksize = AEGIS_BLOCK_SIZE,
	467
	468	.base = {
f606a88e OM	469	.cra_blocksize = 1,
	470	.cra_ctxsize = sizeof(struct aegis_ctx),
	471	.cra_alignmask = 0,
	472
	473	.cra_priority = 100,
	474
	475	.cra_name = "aegis128",
	476	.cra_driver_name = "aegis128-generic",
	477
	478	.cra_module = THIS_MODULE,
	479	}
	480	};
	481
	482	static int __init crypto_aegis128_module_init(void)
	483	{
2698bce1 AB	484	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
	485	crypto_aegis128_have_simd())
	486	static_branch_enable(&have_simd);
cf3d41ad	487
f606a88e OM	488	return crypto_register_aead(&crypto_aegis128_alg);
	489	}
	490
	491	static void __exit crypto_aegis128_module_exit(void)
	492	{
	493	crypto_unregister_aead(&crypto_aegis128_alg);
	494	}
	495
c4741b23	496	subsys_initcall(crypto_aegis128_module_init);
f606a88e OM	497	module_exit(crypto_aegis128_module_exit);
	498
	499	MODULE_LICENSE("GPL");
	500	MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
	501	MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm");
	502	MODULE_ALIAS_CRYPTO("aegis128");
	503	MODULE_ALIAS_CRYPTO("aegis128-generic");