[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/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;
};

struct aegis128_ops {
	int (*skcipher_walk_init)(struct skcipher_walk *walk,
				  struct aead_request *req, bool atomic);

	void (*crypt_chunk)(struct aegis_state *state, u8 *dst,
			    const u8 *src, unsigned int size);
};

static bool 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 (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_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);

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 void crypto_aegis128_process_crypt(struct aegis_state *state,
					  struct aead_request *req,
					  const struct aegis128_ops *ops)
{
	struct skcipher_walk walk;

	ops->skcipher_walk_init(&walk, req, false);

	while (walk.nbytes) {
		unsigned int nbytes = walk.nbytes;

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

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

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

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 void crypto_aegis128_crypt(struct aead_request *req,
				  union aegis_block *tag_xor,
				  unsigned int cryptlen,
				  const struct aegis128_ops *ops)
{
	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	struct aegis_state state;

	crypto_aegis128_init(&state, &ctx->key, req->iv);
	crypto_aegis128_process_ad(&state, req->src, req->assoclen);
	crypto_aegis128_process_crypt(&state, req, ops);
	crypto_aegis128_final(&state, tag_xor, req->assoclen, cryptlen);
}

static int crypto_aegis128_encrypt(struct aead_request *req)
{
	const struct aegis128_ops *ops = &(struct aegis128_ops){
		.skcipher_walk_init = skcipher_walk_aead_encrypt,
		.crypt_chunk = crypto_aegis128_encrypt_chunk,
	};

	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	union aegis_block tag = {};
	unsigned int authsize = crypto_aead_authsize(tfm);
	unsigned int cryptlen = req->cryptlen;

	if (aegis128_do_simd())
		ops = &(struct aegis128_ops){
			.skcipher_walk_init = skcipher_walk_aead_encrypt,
			.crypt_chunk = crypto_aegis128_encrypt_chunk_simd };

	crypto_aegis128_crypt(req, &tag, cryptlen, ops);

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

static int crypto_aegis128_decrypt(struct aead_request *req)
{
	const struct aegis128_ops *ops = &(struct aegis128_ops){
		.skcipher_walk_init = skcipher_walk_aead_decrypt,
		.crypt_chunk = crypto_aegis128_decrypt_chunk,
	};
	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;

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

	if (aegis128_do_simd())
		ops = &(struct aegis128_ops){
			.skcipher_walk_init = skcipher_walk_aead_decrypt,
			.crypt_chunk = crypto_aegis128_decrypt_chunk_simd };

	crypto_aegis128_crypt(req, &tag, cryptlen, ops);

	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))
		have_simd = crypto_aegis128_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>
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/scatterlist.h>
	19
cf3d41ad AB	20	#include <asm/simd.h>
cf3d41ad AB	21
f606a88e OM	22	#include "aegis.h"
	23
	24	#define AEGIS128_NONCE_SIZE 16
	25	#define AEGIS128_STATE_BLOCKS 5
	26	#define AEGIS128_KEY_SIZE 16
	27	#define AEGIS128_MIN_AUTH_SIZE 8
	28	#define AEGIS128_MAX_AUTH_SIZE 16
	29
	30	struct aegis_state {
	31	union aegis_block blocks[AEGIS128_STATE_BLOCKS];
	32	};
	33
	34	struct aegis_ctx {
	35	union aegis_block key;
	36	};
	37
	38	struct aegis128_ops {
	39	int (skcipher_walk_init)(struct skcipher_walk walk,
	40	struct aead_request *req, bool atomic);
	41
	42	void (crypt_chunk)(struct aegis_state state, u8 *dst,
	43	const u8 *src, unsigned int size);
	44	};
	45
cf3d41ad AB	46	static bool have_simd;
cf3d41ad AB	47
f1d087b9 Y	48	static const union aegis_block crypto_aegis_const[2] = {
	49	{ .words64 = {
	50	cpu_to_le64(U64_C(0x0d08050302010100)),
	51	cpu_to_le64(U64_C(0x6279e99059372215)),
	52	} },
	53	{ .words64 = {
	54	cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
	55	cpu_to_le64(U64_C(0xdd28b57342311120)),
	56	} },
	57	};
	58
cf3d41ad AB	59	static bool aegis128_do_simd(void)
	60	{
	61	#ifdef CONFIG_CRYPTO_AEGIS128_SIMD
	62	if (have_simd)
	63	return crypto_simd_usable();
	64	#endif
	65	return false;
	66	}
	67
	68	bool crypto_aegis128_have_simd(void);
	69	void crypto_aegis128_update_simd(struct aegis_state state, const void msg);
	70	void crypto_aegis128_encrypt_chunk_simd(struct aegis_state state, u8 dst,
	71	const u8 *src, unsigned int size);
	72	void crypto_aegis128_decrypt_chunk_simd(struct aegis_state state, u8 dst,
	73	const u8 *src, unsigned int size);
	74
f606a88e OM	75	static void crypto_aegis128_update(struct aegis_state *state)
	76	{
	77	union aegis_block tmp;
	78	unsigned int i;
	79
	80	tmp = state->blocks[AEGIS128_STATE_BLOCKS - 1];
	81	for (i = AEGIS128_STATE_BLOCKS - 1; i > 0; i--)
	82	crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
	83	&state->blocks[i]);
	84	crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
	85	}
	86
	87	static void crypto_aegis128_update_a(struct aegis_state *state,
	88	const union aegis_block *msg)
	89	{
cf3d41ad AB	90	if (aegis128_do_simd()) {
	91	crypto_aegis128_update_simd(state, msg);
	92	return;
	93	}
	94
f606a88e OM	95	crypto_aegis128_update(state);
	96	crypto_aegis_block_xor(&state->blocks[0], msg);
	97	}
	98
	99	static void crypto_aegis128_update_u(struct aegis_state state, const void msg)
	100	{
cf3d41ad AB	101	if (aegis128_do_simd()) {
	102	crypto_aegis128_update_simd(state, msg);
	103	return;
	104	}
	105
f606a88e OM	106	crypto_aegis128_update(state);
	107	crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
	108	}
	109
	110	static void crypto_aegis128_init(struct aegis_state *state,
	111	const union aegis_block *key,
	112	const u8 *iv)
	113	{
	114	union aegis_block key_iv;
	115	unsigned int i;
	116
	117	key_iv = *key;
	118	crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE);
	119
	120	state->blocks[0] = key_iv;
	121	state->blocks[1] = crypto_aegis_const[1];
	122	state->blocks[2] = crypto_aegis_const[0];
	123	state->blocks[3] = *key;
	124	state->blocks[4] = *key;
	125
	126	crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]);
	127	crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]);
	128
	129	for (i = 0; i < 5; i++) {
	130	crypto_aegis128_update_a(state, key);
	131	crypto_aegis128_update_a(state, &key_iv);
	132	}
	133	}
	134
	135	static void crypto_aegis128_ad(struct aegis_state *state,
	136	const u8 *src, unsigned int size)
	137	{
	138	if (AEGIS_ALIGNED(src)) {
	139	const union aegis_block *src_blk =
	140	(const union aegis_block *)src;
	141
	142	while (size >= AEGIS_BLOCK_SIZE) {
	143	crypto_aegis128_update_a(state, src_blk);
	144
	145	size -= AEGIS_BLOCK_SIZE;
	146	src_blk++;
	147	}
	148	} else {
	149	while (size >= AEGIS_BLOCK_SIZE) {
	150	crypto_aegis128_update_u(state, src);
	151
	152	size -= AEGIS_BLOCK_SIZE;
	153	src += AEGIS_BLOCK_SIZE;
	154	}
	155	}
	156	}
	157
	158	static void crypto_aegis128_encrypt_chunk(struct aegis_state state, u8 dst,
	159	const u8 *src, unsigned int size)
	160	{
	161	union aegis_block tmp;
	162
	163	if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
	164	while (size >= AEGIS_BLOCK_SIZE) {
	165	union aegis_block *dst_blk =
	166	(union aegis_block *)dst;
	167	const union aegis_block *src_blk =
	168	(const union aegis_block *)src;
	169
170	tmp = state->blocks[2];
171	crypto_aegis_block_and(&tmp, &state->blocks[3]);
172	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
173	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
174	crypto_aegis_block_xor(&tmp, src_blk);
175
176	crypto_aegis128_update_a(state, src_blk);
177
178	*dst_blk = tmp;
179
180	size -= AEGIS_BLOCK_SIZE;
181	src += AEGIS_BLOCK_SIZE;
182	dst += AEGIS_BLOCK_SIZE;
183	}
184	} else {
185	while (size >= AEGIS_BLOCK_SIZE) {
186	tmp = state->blocks[2];
187	crypto_aegis_block_and(&tmp, &state->blocks[3]);
188	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
189	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
190	crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
191
192	crypto_aegis128_update_u(state, src);
193
194	memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
195
196	size -= AEGIS_BLOCK_SIZE;
197	src += AEGIS_BLOCK_SIZE;
198	dst += AEGIS_BLOCK_SIZE;
199	}
200	}
201
202	if (size > 0) {
203	union aegis_block msg = {};
204	memcpy(msg.bytes, src, size);
205
206	tmp = state->blocks[2];
207	crypto_aegis_block_and(&tmp, &state->blocks[3]);
208	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
209	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
210
211	crypto_aegis128_update_a(state, &msg);
212
213	crypto_aegis_block_xor(&msg, &tmp);
214
215	memcpy(dst, msg.bytes, size);
216	}
217	}
218
219	static void crypto_aegis128_decrypt_chunk(struct aegis_state state, u8 dst,
220	const u8 *src, unsigned int size)
221	{
222	union aegis_block tmp;
223
224	if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
225	while (size >= AEGIS_BLOCK_SIZE) {
226	union aegis_block *dst_blk =
227	(union aegis_block *)dst;
228	const union aegis_block *src_blk =
229	(const union aegis_block *)src;
230
231	tmp = state->blocks[2];
232	crypto_aegis_block_and(&tmp, &state->blocks[3]);
233	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
234	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
235	crypto_aegis_block_xor(&tmp, src_blk);
236
237	crypto_aegis128_update_a(state, &tmp);
238
239	*dst_blk = tmp;
240
241	size -= AEGIS_BLOCK_SIZE;
242	src += AEGIS_BLOCK_SIZE;
243	dst += AEGIS_BLOCK_SIZE;
244	}
245	} else {
246	while (size >= AEGIS_BLOCK_SIZE) {
247	tmp = state->blocks[2];
248	crypto_aegis_block_and(&tmp, &state->blocks[3]);
249	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
250	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
251	crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
252
253	crypto_aegis128_update_a(state, &tmp);
254
255	memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
256
257	size -= AEGIS_BLOCK_SIZE;
258	src += AEGIS_BLOCK_SIZE;
259	dst += AEGIS_BLOCK_SIZE;
260	}
261	}
262
263	if (size > 0) {
264	union aegis_block msg = {};
265	memcpy(msg.bytes, src, size);
266
267	tmp = state->blocks[2];
268	crypto_aegis_block_and(&tmp, &state->blocks[3]);
269	crypto_aegis_block_xor(&tmp, &state->blocks[4]);
270	crypto_aegis_block_xor(&tmp, &state->blocks[1]);
271	crypto_aegis_block_xor(&msg, &tmp);
272
273	memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);
274
275	crypto_aegis128_update_a(state, &msg);
276
277	memcpy(dst, msg.bytes, size);
278	}
279	}
280
281	static void crypto_aegis128_process_ad(struct aegis_state *state,
282	struct scatterlist *sg_src,
283	unsigned int assoclen)
284	{
285	struct scatter_walk walk;
286	union aegis_block buf;
287	unsigned int pos = 0;
288
289	scatterwalk_start(&walk, sg_src);
290	while (assoclen != 0) {
291	unsigned int size = scatterwalk_clamp(&walk, assoclen);
292	unsigned int left = size;
293	void *mapped = scatterwalk_map(&walk);
294	const u8 src = (const u8 )mapped;
295
296	if (pos + size >= AEGIS_BLOCK_SIZE) {
297	if (pos > 0) {
298	unsigned int fill = AEGIS_BLOCK_SIZE - pos;
299	memcpy(buf.bytes + pos, src, fill);
300	crypto_aegis128_update_a(state, &buf);
301	pos = 0;
302	left -= fill;
303	src += fill;
304	}
305
306	crypto_aegis128_ad(state, src, left);
307	src += left & ~(AEGIS_BLOCK_SIZE - 1);
308	left &= AEGIS_BLOCK_SIZE - 1;
309	}
310
311	memcpy(buf.bytes + pos, src, left);
312
313	pos += left;
314	assoclen -= size;
315	scatterwalk_unmap(mapped);
316	scatterwalk_advance(&walk, size);
317	scatterwalk_done(&walk, 0, assoclen);
318	}
319
320	if (pos > 0) {
321	memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
322	crypto_aegis128_update_a(state, &buf);
323	}
324	}
325
326	static void crypto_aegis128_process_crypt(struct aegis_state *state,
327	struct aead_request *req,
328	const struct aegis128_ops *ops)
329	{
330	struct skcipher_walk walk;
f606a88e OM	331
	332	ops->skcipher_walk_init(&walk, req, false);
	333
	334	while (walk.nbytes) {
0f533e67	335	unsigned int nbytes = walk.nbytes;
f606a88e	336
0f533e67 EB	337	if (nbytes < walk.total)
0f533e67 EB	338	nbytes = round_down(nbytes, walk.stride);
f606a88e	339
0f533e67 EB	340	ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
	341	nbytes);
	342
	343	skcipher_walk_done(&walk, walk.nbytes - nbytes);
f606a88e OM	344	}
	345	}
	346
	347	static void crypto_aegis128_final(struct aegis_state *state,
	348	union aegis_block *tag_xor,
	349	u64 assoclen, u64 cryptlen)
	350	{
	351	u64 assocbits = assoclen * 8;
	352	u64 cryptbits = cryptlen * 8;
	353
	354	union aegis_block tmp;
	355	unsigned int i;
	356
	357	tmp.words64[0] = cpu_to_le64(assocbits);
	358	tmp.words64[1] = cpu_to_le64(cryptbits);
	359
	360	crypto_aegis_block_xor(&tmp, &state->blocks[3]);
	361
	362	for (i = 0; i < 7; i++)
	363	crypto_aegis128_update_a(state, &tmp);
	364
	365	for (i = 0; i < AEGIS128_STATE_BLOCKS; i++)
	366	crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
	367	}
	368
	369	static int crypto_aegis128_setkey(struct crypto_aead aead, const u8 key,
	370	unsigned int keylen)
	371	{
	372	struct aegis_ctx *ctx = crypto_aead_ctx(aead);
	373
	374	if (keylen != AEGIS128_KEY_SIZE) {
	375	crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
	376	return -EINVAL;
	377	}
	378
	379	memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
	380	return 0;
	381	}
	382
	383	static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,
	384	unsigned int authsize)
	385	{
	386	if (authsize > AEGIS128_MAX_AUTH_SIZE)
	387	return -EINVAL;
	388	if (authsize < AEGIS128_MIN_AUTH_SIZE)
	389	return -EINVAL;
	390	return 0;
	391	}
	392
	393	static void crypto_aegis128_crypt(struct aead_request *req,
	394	union aegis_block *tag_xor,
	395	unsigned int cryptlen,
	396	const struct aegis128_ops *ops)
	397	{
	398	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	399	struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
	400	struct aegis_state state;
	401
	402	crypto_aegis128_init(&state, &ctx->key, req->iv);
	403	crypto_aegis128_process_ad(&state, req->src, req->assoclen);
	404	crypto_aegis128_process_crypt(&state, req, ops);
	405	crypto_aegis128_final(&state, tag_xor, req->assoclen, cryptlen);
	406	}
	407
408	static int crypto_aegis128_encrypt(struct aead_request *req)
409	{
cf3d41ad	410	const struct aegis128_ops *ops = &(struct aegis128_ops){
f606a88e OM	411	.skcipher_walk_init = skcipher_walk_aead_encrypt,
	412	.crypt_chunk = crypto_aegis128_encrypt_chunk,
	413	};
	414
	415	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	416	union aegis_block tag = {};
	417	unsigned int authsize = crypto_aead_authsize(tfm);
	418	unsigned int cryptlen = req->cryptlen;
	419
cf3d41ad AB	420	if (aegis128_do_simd())
	421	ops = &(struct aegis128_ops){
	422	.skcipher_walk_init = skcipher_walk_aead_encrypt,
	423	.crypt_chunk = crypto_aegis128_encrypt_chunk_simd };
	424
	425	crypto_aegis128_crypt(req, &tag, cryptlen, ops);
f606a88e OM	426
	427	scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
	428	authsize, 1);
	429	return 0;
	430	}
	431
	432	static int crypto_aegis128_decrypt(struct aead_request *req)
	433	{
cf3d41ad	434	const struct aegis128_ops *ops = &(struct aegis128_ops){
f606a88e OM	435	.skcipher_walk_init = skcipher_walk_aead_decrypt,
	436	.crypt_chunk = crypto_aegis128_decrypt_chunk,
	437	};
	438	static const u8 zeros[AEGIS128_MAX_AUTH_SIZE] = {};
	439
	440	struct crypto_aead *tfm = crypto_aead_reqtfm(req);
	441	union aegis_block tag;
	442	unsigned int authsize = crypto_aead_authsize(tfm);
	443	unsigned int cryptlen = req->cryptlen - authsize;
	444
	445	scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
	446	authsize, 0);
	447
cf3d41ad AB	448	if (aegis128_do_simd())
	449	ops = &(struct aegis128_ops){
	450	.skcipher_walk_init = skcipher_walk_aead_decrypt,
	451	.crypt_chunk = crypto_aegis128_decrypt_chunk_simd };
	452
	453	crypto_aegis128_crypt(req, &tag, cryptlen, ops);
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	{
cf3d41ad AB	484	if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD))
	485	have_simd = crypto_aegis128_have_simd();
	486
f606a88e OM	487	return crypto_register_aead(&crypto_aegis128_alg);
	488	}
	489
	490	static void __exit crypto_aegis128_module_exit(void)
	491	{
	492	crypto_unregister_aead(&crypto_aegis128_alg);
	493	}
	494
c4741b23	495	subsys_initcall(crypto_aegis128_module_init);
f606a88e OM	496	module_exit(crypto_aegis128_module_exit);
	497
	498	MODULE_LICENSE("GPL");
	499	MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
	500	MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm");
	501	MODULE_ALIAS_CRYPTO("aegis128");
	502	MODULE_ALIAS_CRYPTO("aegis128-generic");