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crypto: aegis - Add generic AEGIS AEAD implementations 

This patch adds the generic implementation of the AEGIS family of AEAD
algorithms (AEGIS-128, AEGIS-128L, and AEGIS-256). The original
authors of AEGIS are Hongjun Wu and Bart Preneel.

At the time of writing, AEGIS is one of the finalists in CAESAR, an
open competition intended to select a portfolio of alternatives to
the problematic AES-GCM:

https://competitions.cr.yp.to/caesar-submissions.html
https://competitions.cr.yp.to/round3/aegisv11.pdf

Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
hifive-unleashed-5.1
Ondrej Mosnacek 2018-05-11 14:12:49 +02:00 committed by Herbert Xu
parent 15f47ce575
commit f606a88e58
6 changed files with 1572 additions and 0 deletions
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21
crypto/Kconfig
View File

@ -289,6 +289,27 @@ config CRYPTO_CHACHA20POLY1305
with the Poly1305 authenticator. It is defined in RFC7539 for use in with the Poly1305 authenticator. It is defined in RFC7539 for use in
IETF protocols. IETF protocols.
config CRYPTO_AEGIS128
tristate "AEGIS-128 AEAD algorithm"
select CRYPTO_AEAD
select CRYPTO_AES # for AES S-box tables
help
Support for the AEGIS-128 dedicated AEAD algorithm.
config CRYPTO_AEGIS128L
tristate "AEGIS-128L AEAD algorithm"
select CRYPTO_AEAD
select CRYPTO_AES # for AES S-box tables
help
Support for the AEGIS-128L dedicated AEAD algorithm.
config CRYPTO_AEGIS256
tristate "AEGIS-256 AEAD algorithm"
select CRYPTO_AEAD
select CRYPTO_AES # for AES S-box tables
help
Support for the AEGIS-256 dedicated AEAD algorithm.
config CRYPTO_SEQIV config CRYPTO_SEQIV
tristate "Sequence Number IV Generator" tristate "Sequence Number IV Generator"
select CRYPTO_AEAD select CRYPTO_AEAD

3
crypto/Makefile
View File

@ -86,6 +86,9 @@ obj-$(CONFIG_CRYPTO_KEYWRAP) += keywrap.o
obj-$(CONFIG_CRYPTO_GCM) += gcm.o obj-$(CONFIG_CRYPTO_GCM) += gcm.o
obj-$(CONFIG_CRYPTO_CCM) += ccm.o obj-$(CONFIG_CRYPTO_CCM) += ccm.o
obj-$(CONFIG_CRYPTO_CHACHA20POLY1305) += chacha20poly1305.o obj-$(CONFIG_CRYPTO_CHACHA20POLY1305) += chacha20poly1305.o
obj-$(CONFIG_CRYPTO_AEGIS128) += aegis128.o
obj-$(CONFIG_CRYPTO_AEGIS128L) += aegis128l.o
obj-$(CONFIG_CRYPTO_AEGIS256) += aegis256.o
obj-$(CONFIG_CRYPTO_PCRYPT) += pcrypt.o obj-$(CONFIG_CRYPTO_PCRYPT) += pcrypt.o
obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o obj-$(CONFIG_CRYPTO_CRYPTD) += cryptd.o
obj-$(CONFIG_CRYPTO_MCRYPTD) += mcryptd.o obj-$(CONFIG_CRYPTO_MCRYPTD) += mcryptd.o

80
crypto/aegis.h 100644
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@ -0,0 +1,80 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* AEGIS common definitions
*
* Copyright (c) 2018 Ondrej Mosnacek <omosnacek@gmail.com>
* Copyright (c) 2018 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#ifndef _CRYPTO_AEGIS_H
#define _CRYPTO_AEGIS_H
#include <crypto/aes.h>
#include <linux/types.h>
#define AEGIS_BLOCK_SIZE 16
union aegis_block {
__le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
u32 words32[AEGIS_BLOCK_SIZE / sizeof(u32)];
u8 bytes[AEGIS_BLOCK_SIZE];
};
#define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
#define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
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 void crypto_aegis_block_xor(union aegis_block *dst,
const union aegis_block *src)
{
dst->words64[0] ^= src->words64[0];
dst->words64[1] ^= src->words64[1];
}
static void crypto_aegis_block_and(union aegis_block *dst,
const union aegis_block *src)
{
dst->words64[0] &= src->words64[0];
dst->words64[1] &= src->words64[1];
}
static void crypto_aegis_aesenc(union aegis_block *dst,
const union aegis_block *src,
const union aegis_block *key)
{
u32 *d = dst->words32;
const u8 *s = src->bytes;
const u32 *k = key->words32;
const u32 *t0 = crypto_ft_tab[0];
const u32 *t1 = crypto_ft_tab[1];
const u32 *t2 = crypto_ft_tab[2];
const u32 *t3 = crypto_ft_tab[3];
u32 d0, d1, d2, d3;
d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]] ^ k[0];
d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]] ^ k[1];
d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]] ^ k[2];
d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]] ^ k[3];
d[0] = d0;
d[1] = d1;
d[2] = d2;
d[3] = d3;
}
#endif /* _CRYPTO_AEGIS_H */

463
crypto/aegis128.c 100644
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@ -0,0 +1,463 @@
/*
* 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.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <crypto/algapi.h>
#include <crypto/internal/aead.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 "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 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)
{
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)
{
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;
u8 *src, *dst;
unsigned int chunksize;
ops->skcipher_walk_init(&walk, req, false);
while (walk.nbytes) {
src = walk.src.virt.addr;
dst = walk.dst.virt.addr;
chunksize = walk.nbytes;
ops->crypt_chunk(state, dst, src, chunksize);
skcipher_walk_done(&walk, 0);
}
}
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)
{
static const struct aegis128_ops 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;
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)
{
static const struct aegis128_ops 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);
crypto_aegis128_crypt(req, &tag, cryptlen, &ops);
return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
}
static int crypto_aegis128_init_tfm(struct crypto_aead *tfm)
{
return 0;
}
static void crypto_aegis128_exit_tfm(struct crypto_aead *tfm)
{
}
static struct aead_alg crypto_aegis128_alg = {
.setkey = crypto_aegis128_setkey,
.setauthsize = crypto_aegis128_setauthsize,
.encrypt = crypto_aegis128_encrypt,
.decrypt = crypto_aegis128_decrypt,
.init = crypto_aegis128_init_tfm,
.exit = crypto_aegis128_exit_tfm,
.ivsize = AEGIS128_NONCE_SIZE,
.maxauthsize = AEGIS128_MAX_AUTH_SIZE,
.chunksize = AEGIS_BLOCK_SIZE,
.base = {
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
.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)
{
return crypto_register_aead(&crypto_aegis128_alg);
}
static void __exit crypto_aegis128_module_exit(void)
{
crypto_unregister_aead(&crypto_aegis128_alg);
}
module_init(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");

527
crypto/aegis128l.c 100644
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@ -0,0 +1,527 @@
/*
* The AEGIS-128L Authenticated-Encryption Algorithm
*
* Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <crypto/algapi.h>
#include <crypto/internal/aead.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 "aegis.h"
#define AEGIS128L_CHUNK_BLOCKS 2
#define AEGIS128L_CHUNK_SIZE (AEGIS128L_CHUNK_BLOCKS * AEGIS_BLOCK_SIZE)
#define AEGIS128L_NONCE_SIZE 16
#define AEGIS128L_STATE_BLOCKS 8
#define AEGIS128L_KEY_SIZE 16
#define AEGIS128L_MIN_AUTH_SIZE 8
#define AEGIS128L_MAX_AUTH_SIZE 16
union aegis_chunk {
union aegis_block blocks[AEGIS128L_CHUNK_BLOCKS];
u8 bytes[AEGIS128L_CHUNK_SIZE];
};
struct aegis_state {
union aegis_block blocks[AEGIS128L_STATE_BLOCKS];
};
struct aegis_ctx {
union aegis_block key;
};
struct aegis128l_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 void crypto_aegis128l_update(struct aegis_state *state)
{
union aegis_block tmp;
unsigned int i;
tmp = state->blocks[AEGIS128L_STATE_BLOCKS - 1];
for (i = AEGIS128L_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_aegis128l_update_a(struct aegis_state *state,
const union aegis_chunk *msg)
{
crypto_aegis128l_update(state);
crypto_aegis_block_xor(&state->blocks[0], &msg->blocks[0]);
crypto_aegis_block_xor(&state->blocks[4], &msg->blocks[1]);
}
static void crypto_aegis128l_update_u(struct aegis_state *state,
const void *msg)
{
crypto_aegis128l_update(state);
crypto_xor(state->blocks[0].bytes, msg + 0 * AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
crypto_xor(state->blocks[4].bytes, msg + 1 * AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
}
static void crypto_aegis128l_init(struct aegis_state *state,
const union aegis_block *key,
const u8 *iv)
{
union aegis_block key_iv;
union aegis_chunk chunk;
unsigned int i;
memcpy(chunk.blocks[0].bytes, iv, AEGIS_BLOCK_SIZE);
chunk.blocks[1] = *key;
key_iv = *key;
crypto_aegis_block_xor(&key_iv, &chunk.blocks[0]);
state->blocks[0] = key_iv;
state->blocks[1] = crypto_aegis_const[1];
state->blocks[2] = crypto_aegis_const[0];
state->blocks[3] = crypto_aegis_const[1];
state->blocks[4] = key_iv;
state->blocks[5] = *key;
state->blocks[6] = *key;
state->blocks[7] = *key;
crypto_aegis_block_xor(&state->blocks[5], &crypto_aegis_const[0]);
crypto_aegis_block_xor(&state->blocks[6], &crypto_aegis_const[1]);
crypto_aegis_block_xor(&state->blocks[7], &crypto_aegis_const[0]);
for (i = 0; i < 10; i++) {
crypto_aegis128l_update_a(state, &chunk);
}
}
static void crypto_aegis128l_ad(struct aegis_state *state,
const u8 *src, unsigned int size)
{
if (AEGIS_ALIGNED(src)) {
const union aegis_chunk *src_chunk =
(const union aegis_chunk *)src;
while (size >= AEGIS128L_CHUNK_SIZE) {
crypto_aegis128l_update_a(state, src_chunk);
size -= AEGIS128L_CHUNK_SIZE;
src_chunk += 1;
}
} else {
while (size >= AEGIS128L_CHUNK_SIZE) {
crypto_aegis128l_update_u(state, src);
size -= AEGIS128L_CHUNK_SIZE;
src += AEGIS128L_CHUNK_SIZE;
}
}
}
static void crypto_aegis128l_encrypt_chunk(struct aegis_state *state, u8 *dst,
const u8 *src, unsigned int size)
{
union aegis_chunk tmp;
union aegis_block *tmp0 = &tmp.blocks[0];
union aegis_block *tmp1 = &tmp.blocks[1];
if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
while (size >= AEGIS128L_CHUNK_SIZE) {
union aegis_chunk *dst_blk =
(union aegis_chunk *)dst;
const union aegis_chunk *src_blk =
(const union aegis_chunk *)src;
*tmp0 = state->blocks[2];
crypto_aegis_block_and(tmp0, &state->blocks[3]);
crypto_aegis_block_xor(tmp0, &state->blocks[6]);
crypto_aegis_block_xor(tmp0, &state->blocks[1]);
crypto_aegis_block_xor(tmp0, &src_blk->blocks[0]);
*tmp1 = state->blocks[6];
crypto_aegis_block_and(tmp1, &state->blocks[7]);
crypto_aegis_block_xor(tmp1, &state->blocks[5]);
crypto_aegis_block_xor(tmp1, &state->blocks[2]);
crypto_aegis_block_xor(tmp1, &src_blk->blocks[1]);
crypto_aegis128l_update_a(state, src_blk);
*dst_blk = tmp;
size -= AEGIS128L_CHUNK_SIZE;
src += AEGIS128L_CHUNK_SIZE;
dst += AEGIS128L_CHUNK_SIZE;
}
} else {
while (size >= AEGIS128L_CHUNK_SIZE) {
*tmp0 = state->blocks[2];
crypto_aegis_block_and(tmp0, &state->blocks[3]);
crypto_aegis_block_xor(tmp0, &state->blocks[6]);
crypto_aegis_block_xor(tmp0, &state->blocks[1]);
crypto_xor(tmp0->bytes, src + 0 * AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
*tmp1 = state->blocks[6];
crypto_aegis_block_and(tmp1, &state->blocks[7]);
crypto_aegis_block_xor(tmp1, &state->blocks[5]);
crypto_aegis_block_xor(tmp1, &state->blocks[2]);
crypto_xor(tmp1->bytes, src + 1 * AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
crypto_aegis128l_update_u(state, src);
memcpy(dst, tmp.bytes, AEGIS128L_CHUNK_SIZE);
size -= AEGIS128L_CHUNK_SIZE;
src += AEGIS128L_CHUNK_SIZE;
dst += AEGIS128L_CHUNK_SIZE;
}
}
if (size > 0) {
union aegis_chunk msg = {};
memcpy(msg.bytes, src, size);
*tmp0 = state->blocks[2];
crypto_aegis_block_and(tmp0, &state->blocks[3]);
crypto_aegis_block_xor(tmp0, &state->blocks[6]);
crypto_aegis_block_xor(tmp0, &state->blocks[1]);
*tmp1 = state->blocks[6];
crypto_aegis_block_and(tmp1, &state->blocks[7]);
crypto_aegis_block_xor(tmp1, &state->blocks[5]);
crypto_aegis_block_xor(tmp1, &state->blocks[2]);
crypto_aegis128l_update_a(state, &msg);
crypto_aegis_block_xor(&msg.blocks[0], tmp0);
crypto_aegis_block_xor(&msg.blocks[1], tmp1);
memcpy(dst, msg.bytes, size);
}
}
static void crypto_aegis128l_decrypt_chunk(struct aegis_state *state, u8 *dst,
const u8 *src, unsigned int size)
{
union aegis_chunk tmp;
union aegis_block *tmp0 = &tmp.blocks[0];
union aegis_block *tmp1 = &tmp.blocks[1];
if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
while (size >= AEGIS128L_CHUNK_SIZE) {
union aegis_chunk *dst_blk =
(union aegis_chunk *)dst;
const union aegis_chunk *src_blk =
(const union aegis_chunk *)src;
*tmp0 = state->blocks[2];
crypto_aegis_block_and(tmp0, &state->blocks[3]);
crypto_aegis_block_xor(tmp0, &state->blocks[6]);
crypto_aegis_block_xor(tmp0, &state->blocks[1]);
crypto_aegis_block_xor(tmp0, &src_blk->blocks[0]);
*tmp1 = state->blocks[6];
crypto_aegis_block_and(tmp1, &state->blocks[7]);
crypto_aegis_block_xor(tmp1, &state->blocks[5]);
crypto_aegis_block_xor(tmp1, &state->blocks[2]);
crypto_aegis_block_xor(tmp1, &src_blk->blocks[1]);
crypto_aegis128l_update_a(state, &tmp);
*dst_blk = tmp;
size -= AEGIS128L_CHUNK_SIZE;
src += AEGIS128L_CHUNK_SIZE;
dst += AEGIS128L_CHUNK_SIZE;
}
} else {
while (size >= AEGIS128L_CHUNK_SIZE) {
*tmp0 = state->blocks[2];
crypto_aegis_block_and(tmp0, &state->blocks[3]);
crypto_aegis_block_xor(tmp0, &state->blocks[6]);
crypto_aegis_block_xor(tmp0, &state->blocks[1]);
crypto_xor(tmp0->bytes, src + 0 * AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
*tmp1 = state->blocks[6];
crypto_aegis_block_and(tmp1, &state->blocks[7]);
crypto_aegis_block_xor(tmp1, &state->blocks[5]);
crypto_aegis_block_xor(tmp1, &state->blocks[2]);
crypto_xor(tmp1->bytes, src + 1 * AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
crypto_aegis128l_update_a(state, &tmp);
memcpy(dst, tmp.bytes, AEGIS128L_CHUNK_SIZE);
size -= AEGIS128L_CHUNK_SIZE;
src += AEGIS128L_CHUNK_SIZE;
dst += AEGIS128L_CHUNK_SIZE;
}
}
if (size > 0) {
union aegis_chunk msg = {};
memcpy(msg.bytes, src, size);
*tmp0 = state->blocks[2];
crypto_aegis_block_and(tmp0, &state->blocks[3]);
crypto_aegis_block_xor(tmp0, &state->blocks[6]);
crypto_aegis_block_xor(tmp0, &state->blocks[1]);
crypto_aegis_block_xor(&msg.blocks[0], tmp0);
*tmp1 = state->blocks[6];
crypto_aegis_block_and(tmp1, &state->blocks[7]);
crypto_aegis_block_xor(tmp1, &state->blocks[5]);
crypto_aegis_block_xor(tmp1, &state->blocks[2]);
crypto_aegis_block_xor(&msg.blocks[1], tmp1);
memset(msg.bytes + size, 0, AEGIS128L_CHUNK_SIZE - size);
crypto_aegis128l_update_a(state, &msg);
memcpy(dst, msg.bytes, size);
}
}
static void crypto_aegis128l_process_ad(struct aegis_state *state,
struct scatterlist *sg_src,
unsigned int assoclen)
{
struct scatter_walk walk;
union aegis_chunk 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 >= AEGIS128L_CHUNK_SIZE) {
if (pos > 0) {
unsigned int fill = AEGIS128L_CHUNK_SIZE - pos;
memcpy(buf.bytes + pos, src, fill);
crypto_aegis128l_update_a(state, &buf);
pos = 0;
left -= fill;
src += fill;
}
crypto_aegis128l_ad(state, src, left);
src += left & ~(AEGIS128L_CHUNK_SIZE - 1);
left &= AEGIS128L_CHUNK_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, AEGIS128L_CHUNK_SIZE - pos);
crypto_aegis128l_update_a(state, &buf);
}
}
static void crypto_aegis128l_process_crypt(struct aegis_state *state,
struct aead_request *req,
const struct aegis128l_ops *ops)
{
struct skcipher_walk walk;
u8 *src, *dst;
unsigned int chunksize;
ops->skcipher_walk_init(&walk, req, false);
while (walk.nbytes) {
src = walk.src.virt.addr;
dst = walk.dst.virt.addr;
chunksize = walk.nbytes;
ops->crypt_chunk(state, dst, src, chunksize);
skcipher_walk_done(&walk, 0);
}
}
static void crypto_aegis128l_final(struct aegis_state *state,
union aegis_block *tag_xor,
u64 assoclen, u64 cryptlen)
{
u64 assocbits = assoclen * 8;
u64 cryptbits = cryptlen * 8;
union aegis_chunk tmp;
unsigned int i;
tmp.blocks[0].words64[0] = cpu_to_le64(assocbits);
tmp.blocks[0].words64[1] = cpu_to_le64(cryptbits);
crypto_aegis_block_xor(&tmp.blocks[0], &state->blocks[2]);
tmp.blocks[1] = tmp.blocks[0];
for (i = 0; i < 7; i++)
crypto_aegis128l_update_a(state, &tmp);
for (i = 0; i < 7; i++)
crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
}
static int crypto_aegis128l_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
struct aegis_ctx *ctx = crypto_aead_ctx(aead);
if (keylen != AEGIS128L_KEY_SIZE) {
crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
memcpy(ctx->key.bytes, key, AEGIS128L_KEY_SIZE);
return 0;
}
static int crypto_aegis128l_setauthsize(struct crypto_aead *tfm,
unsigned int authsize)
{
if (authsize > AEGIS128L_MAX_AUTH_SIZE)
return -EINVAL;
if (authsize < AEGIS128L_MIN_AUTH_SIZE)
return -EINVAL;
return 0;
}
static void crypto_aegis128l_crypt(struct aead_request *req,
union aegis_block *tag_xor,
unsigned int cryptlen,
const struct aegis128l_ops *ops)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
struct aegis_state state;
crypto_aegis128l_init(&state, &ctx->key, req->iv);
crypto_aegis128l_process_ad(&state, req->src, req->assoclen);
crypto_aegis128l_process_crypt(&state, req, ops);
crypto_aegis128l_final(&state, tag_xor, req->assoclen, cryptlen);
}
static int crypto_aegis128l_encrypt(struct aead_request *req)
{
static const struct aegis128l_ops ops = {
.skcipher_walk_init = skcipher_walk_aead_encrypt,
.crypt_chunk = crypto_aegis128l_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;
crypto_aegis128l_crypt(req, &tag, cryptlen, &ops);
scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
authsize, 1);
return 0;
}
static int crypto_aegis128l_decrypt(struct aead_request *req)
{
static const struct aegis128l_ops ops = {
.skcipher_walk_init = skcipher_walk_aead_decrypt,
.crypt_chunk = crypto_aegis128l_decrypt_chunk,
};
static const u8 zeros[AEGIS128L_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);
crypto_aegis128l_crypt(req, &tag, cryptlen, &ops);
return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
}
static int crypto_aegis128l_init_tfm(struct crypto_aead *tfm)
{
return 0;
}
static void crypto_aegis128l_exit_tfm(struct crypto_aead *tfm)
{
}
static struct aead_alg crypto_aegis128l_alg = {
.setkey = crypto_aegis128l_setkey,
.setauthsize = crypto_aegis128l_setauthsize,
.encrypt = crypto_aegis128l_encrypt,
.decrypt = crypto_aegis128l_decrypt,
.init = crypto_aegis128l_init_tfm,
.exit = crypto_aegis128l_exit_tfm,
.ivsize = AEGIS128L_NONCE_SIZE,
.maxauthsize = AEGIS128L_MAX_AUTH_SIZE,
.chunksize = AEGIS128L_CHUNK_SIZE,
.base = {
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct aegis_ctx),
.cra_alignmask = 0,
.cra_priority = 100,
.cra_name = "aegis128l",
.cra_driver_name = "aegis128l-generic",
.cra_module = THIS_MODULE,
}
};
static int __init crypto_aegis128l_module_init(void)
{
return crypto_register_aead(&crypto_aegis128l_alg);
}
static void __exit crypto_aegis128l_module_exit(void)
{
crypto_unregister_aead(&crypto_aegis128l_alg);
}
module_init(crypto_aegis128l_module_init);
module_exit(crypto_aegis128l_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
MODULE_DESCRIPTION("AEGIS-128L AEAD algorithm");
MODULE_ALIAS_CRYPTO("aegis128l");
MODULE_ALIAS_CRYPTO("aegis128l-generic");

478
crypto/aegis256.c 100644
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@ -0,0 +1,478 @@
/*
* The AEGIS-256 Authenticated-Encryption Algorithm
*
* Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <crypto/algapi.h>
#include <crypto/internal/aead.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 "aegis.h"
#define AEGIS256_NONCE_SIZE 32
#define AEGIS256_STATE_BLOCKS 6
#define AEGIS256_KEY_SIZE 32
#define AEGIS256_MIN_AUTH_SIZE 8
#define AEGIS256_MAX_AUTH_SIZE 16
struct aegis_state {
union aegis_block blocks[AEGIS256_STATE_BLOCKS];
};
struct aegis_ctx {
union aegis_block key[AEGIS256_KEY_SIZE / AEGIS_BLOCK_SIZE];
};
struct aegis256_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 void crypto_aegis256_update(struct aegis_state *state)
{
union aegis_block tmp;
unsigned int i;
tmp = state->blocks[AEGIS256_STATE_BLOCKS - 1];
for (i = AEGIS256_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_aegis256_update_a(struct aegis_state *state,
const union aegis_block *msg)
{
crypto_aegis256_update(state);
crypto_aegis_block_xor(&state->blocks[0], msg);
}
static void crypto_aegis256_update_u(struct aegis_state *state, const void *msg)
{
crypto_aegis256_update(state);
crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
}
static void crypto_aegis256_init(struct aegis_state *state,
const union aegis_block *key,
const u8 *iv)
{
union aegis_block key_iv[2];
unsigned int i;
key_iv[0] = key[0];
key_iv[1] = key[1];
crypto_xor(key_iv[0].bytes, iv + 0 * AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
crypto_xor(key_iv[1].bytes, iv + 1 * AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
state->blocks[0] = key_iv[0];
state->blocks[1] = key_iv[1];
state->blocks[2] = crypto_aegis_const[1];
state->blocks[3] = crypto_aegis_const[0];
state->blocks[4] = key[0];
state->blocks[5] = key[1];
crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[0]);
crypto_aegis_block_xor(&state->blocks[5], &crypto_aegis_const[1]);
for (i = 0; i < 4; i++) {
crypto_aegis256_update_a(state, &key[0]);
crypto_aegis256_update_a(state, &key[1]);
crypto_aegis256_update_a(state, &key_iv[0]);
crypto_aegis256_update_a(state, &key_iv[1]);
}
}
static void crypto_aegis256_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_aegis256_update_a(state, src_blk);
size -= AEGIS_BLOCK_SIZE;
src_blk++;
}
} else {
while (size >= AEGIS_BLOCK_SIZE) {
crypto_aegis256_update_u(state, src);
size -= AEGIS_BLOCK_SIZE;
src += AEGIS_BLOCK_SIZE;
}
}
}
static void crypto_aegis256_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[5]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_aegis_block_xor(&tmp, src_blk);
crypto_aegis256_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[5]);
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_aegis256_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[5]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_aegis256_update_a(state, &msg);
crypto_aegis_block_xor(&msg, &tmp);
memcpy(dst, msg.bytes, size);
}
}
static void crypto_aegis256_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[5]);
crypto_aegis_block_xor(&tmp, &state->blocks[4]);
crypto_aegis_block_xor(&tmp, &state->blocks[1]);
crypto_aegis_block_xor(&tmp, src_blk);
crypto_aegis256_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[5]);
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_aegis256_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[5]);
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_aegis256_update_a(state, &msg);
memcpy(dst, msg.bytes, size);
}
}
static void crypto_aegis256_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_aegis256_update_a(state, &buf);
pos = 0;
left -= fill;
src += fill;
}
crypto_aegis256_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_aegis256_update_a(state, &buf);
}
}
static void crypto_aegis256_process_crypt(struct aegis_state *state,
struct aead_request *req,
const struct aegis256_ops *ops)
{
struct skcipher_walk walk;
u8 *src, *dst;
unsigned int chunksize;
ops->skcipher_walk_init(&walk, req, false);
while (walk.nbytes) {
src = walk.src.virt.addr;
dst = walk.dst.virt.addr;
chunksize = walk.nbytes;
ops->crypt_chunk(state, dst, src, chunksize);
skcipher_walk_done(&walk, 0);
}
}
static void crypto_aegis256_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_aegis256_update_a(state, &tmp);
for (i = 0; i < AEGIS256_STATE_BLOCKS; i++)
crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
}
static int crypto_aegis256_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
struct aegis_ctx *ctx = crypto_aead_ctx(aead);
if (keylen != AEGIS256_KEY_SIZE) {
crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
memcpy(ctx->key[0].bytes, key, AEGIS_BLOCK_SIZE);
memcpy(ctx->key[1].bytes, key + AEGIS_BLOCK_SIZE,
AEGIS_BLOCK_SIZE);
return 0;
}
static int crypto_aegis256_setauthsize(struct crypto_aead *tfm,
unsigned int authsize)
{
if (authsize > AEGIS256_MAX_AUTH_SIZE)
return -EINVAL;
if (authsize < AEGIS256_MIN_AUTH_SIZE)
return -EINVAL;
return 0;
}
static void crypto_aegis256_crypt(struct aead_request *req,
union aegis_block *tag_xor,
unsigned int cryptlen,
const struct aegis256_ops *ops)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
struct aegis_state state;
crypto_aegis256_init(&state, ctx->key, req->iv);
crypto_aegis256_process_ad(&state, req->src, req->assoclen);
crypto_aegis256_process_crypt(&state, req, ops);
crypto_aegis256_final(&state, tag_xor, req->assoclen, cryptlen);
}
static int crypto_aegis256_encrypt(struct aead_request *req)
{
static const struct aegis256_ops ops = {
.skcipher_walk_init = skcipher_walk_aead_encrypt,
.crypt_chunk = crypto_aegis256_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;
crypto_aegis256_crypt(req, &tag, cryptlen, &ops);
scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
authsize, 1);
return 0;
}
static int crypto_aegis256_decrypt(struct aead_request *req)
{
static const struct aegis256_ops ops = {
.skcipher_walk_init = skcipher_walk_aead_decrypt,
.crypt_chunk = crypto_aegis256_decrypt_chunk,
};
static const u8 zeros[AEGIS256_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);
crypto_aegis256_crypt(req, &tag, cryptlen, &ops);
return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
}
static int crypto_aegis256_init_tfm(struct crypto_aead *tfm)
{
return 0;
}
static void crypto_aegis256_exit_tfm(struct crypto_aead *tfm)
{
}
static struct aead_alg crypto_aegis256_alg = {
.setkey = crypto_aegis256_setkey,
.setauthsize = crypto_aegis256_setauthsize,
.encrypt = crypto_aegis256_encrypt,
.decrypt = crypto_aegis256_decrypt,
.init = crypto_aegis256_init_tfm,
.exit = crypto_aegis256_exit_tfm,
.ivsize = AEGIS256_NONCE_SIZE,
.maxauthsize = AEGIS256_MAX_AUTH_SIZE,
.chunksize = AEGIS_BLOCK_SIZE,
.base = {
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
.cra_blocksize = 1,
.cra_ctxsize = sizeof(struct aegis_ctx),
.cra_alignmask = 0,
.cra_priority = 100,
.cra_name = "aegis256",
.cra_driver_name = "aegis256-generic",
.cra_module = THIS_MODULE,
}
};
static int __init crypto_aegis256_module_init(void)
{
return crypto_register_aead(&crypto_aegis256_alg);
}
static void __exit crypto_aegis256_module_exit(void)
{
crypto_unregister_aead(&crypto_aegis256_alg);
}
module_init(crypto_aegis256_module_init);
module_exit(crypto_aegis256_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
MODULE_DESCRIPTION("AEGIS-256 AEAD algorithm");
MODULE_ALIAS_CRYPTO("aegis256");
MODULE_ALIAS_CRYPTO("aegis256-generic");