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![Ondrej Mosnacek](/assets/img/avatar_default.png)
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>
478 lines
12 KiB
C
478 lines
12 KiB
C
/*
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* The AEGIS-256 Authenticated-Encryption Algorithm
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*
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* Copyright (c) 2017-2018 Ondrej Mosnacek <omosnacek@gmail.com>
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* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <crypto/algapi.h>
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#include <crypto/internal/aead.h>
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#include <crypto/internal/skcipher.h>
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#include <crypto/scatterwalk.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/scatterlist.h>
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#include "aegis.h"
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#define AEGIS256_NONCE_SIZE 32
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#define AEGIS256_STATE_BLOCKS 6
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#define AEGIS256_KEY_SIZE 32
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#define AEGIS256_MIN_AUTH_SIZE 8
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#define AEGIS256_MAX_AUTH_SIZE 16
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struct aegis_state {
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union aegis_block blocks[AEGIS256_STATE_BLOCKS];
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};
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struct aegis_ctx {
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union aegis_block key[AEGIS256_KEY_SIZE / AEGIS_BLOCK_SIZE];
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};
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struct aegis256_ops {
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int (*skcipher_walk_init)(struct skcipher_walk *walk,
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struct aead_request *req, bool atomic);
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void (*crypt_chunk)(struct aegis_state *state, u8 *dst,
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const u8 *src, unsigned int size);
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};
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static void crypto_aegis256_update(struct aegis_state *state)
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{
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union aegis_block tmp;
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unsigned int i;
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tmp = state->blocks[AEGIS256_STATE_BLOCKS - 1];
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for (i = AEGIS256_STATE_BLOCKS - 1; i > 0; i--)
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crypto_aegis_aesenc(&state->blocks[i], &state->blocks[i - 1],
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&state->blocks[i]);
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crypto_aegis_aesenc(&state->blocks[0], &tmp, &state->blocks[0]);
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}
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static void crypto_aegis256_update_a(struct aegis_state *state,
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const union aegis_block *msg)
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{
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crypto_aegis256_update(state);
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crypto_aegis_block_xor(&state->blocks[0], msg);
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}
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static void crypto_aegis256_update_u(struct aegis_state *state, const void *msg)
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{
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crypto_aegis256_update(state);
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crypto_xor(state->blocks[0].bytes, msg, AEGIS_BLOCK_SIZE);
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}
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static void crypto_aegis256_init(struct aegis_state *state,
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const union aegis_block *key,
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const u8 *iv)
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{
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union aegis_block key_iv[2];
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unsigned int i;
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key_iv[0] = key[0];
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key_iv[1] = key[1];
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crypto_xor(key_iv[0].bytes, iv + 0 * AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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crypto_xor(key_iv[1].bytes, iv + 1 * AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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state->blocks[0] = key_iv[0];
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state->blocks[1] = key_iv[1];
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state->blocks[2] = crypto_aegis_const[1];
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state->blocks[3] = crypto_aegis_const[0];
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state->blocks[4] = key[0];
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state->blocks[5] = key[1];
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crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[0]);
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crypto_aegis_block_xor(&state->blocks[5], &crypto_aegis_const[1]);
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for (i = 0; i < 4; i++) {
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crypto_aegis256_update_a(state, &key[0]);
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crypto_aegis256_update_a(state, &key[1]);
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crypto_aegis256_update_a(state, &key_iv[0]);
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crypto_aegis256_update_a(state, &key_iv[1]);
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}
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}
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static void crypto_aegis256_ad(struct aegis_state *state,
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const u8 *src, unsigned int size)
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{
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if (AEGIS_ALIGNED(src)) {
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const union aegis_block *src_blk =
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(const union aegis_block *)src;
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while (size >= AEGIS_BLOCK_SIZE) {
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crypto_aegis256_update_a(state, src_blk);
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size -= AEGIS_BLOCK_SIZE;
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src_blk++;
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}
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} else {
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while (size >= AEGIS_BLOCK_SIZE) {
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crypto_aegis256_update_u(state, src);
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size -= AEGIS_BLOCK_SIZE;
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src += AEGIS_BLOCK_SIZE;
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}
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}
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}
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static void crypto_aegis256_encrypt_chunk(struct aegis_state *state, u8 *dst,
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const u8 *src, unsigned int size)
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{
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union aegis_block tmp;
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if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
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while (size >= AEGIS_BLOCK_SIZE) {
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union aegis_block *dst_blk =
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(union aegis_block *)dst;
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const union aegis_block *src_blk =
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(const union aegis_block *)src;
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tmp = state->blocks[2];
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crypto_aegis_block_and(&tmp, &state->blocks[3]);
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crypto_aegis_block_xor(&tmp, &state->blocks[5]);
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crypto_aegis_block_xor(&tmp, &state->blocks[4]);
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crypto_aegis_block_xor(&tmp, &state->blocks[1]);
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crypto_aegis_block_xor(&tmp, src_blk);
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crypto_aegis256_update_a(state, src_blk);
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*dst_blk = tmp;
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size -= AEGIS_BLOCK_SIZE;
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src += AEGIS_BLOCK_SIZE;
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dst += AEGIS_BLOCK_SIZE;
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}
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} else {
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while (size >= AEGIS_BLOCK_SIZE) {
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tmp = state->blocks[2];
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crypto_aegis_block_and(&tmp, &state->blocks[3]);
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crypto_aegis_block_xor(&tmp, &state->blocks[5]);
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crypto_aegis_block_xor(&tmp, &state->blocks[4]);
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crypto_aegis_block_xor(&tmp, &state->blocks[1]);
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crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
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crypto_aegis256_update_u(state, src);
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memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
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size -= AEGIS_BLOCK_SIZE;
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src += AEGIS_BLOCK_SIZE;
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dst += AEGIS_BLOCK_SIZE;
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}
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}
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if (size > 0) {
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union aegis_block msg = {};
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memcpy(msg.bytes, src, size);
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tmp = state->blocks[2];
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crypto_aegis_block_and(&tmp, &state->blocks[3]);
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crypto_aegis_block_xor(&tmp, &state->blocks[5]);
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crypto_aegis_block_xor(&tmp, &state->blocks[4]);
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crypto_aegis_block_xor(&tmp, &state->blocks[1]);
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crypto_aegis256_update_a(state, &msg);
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crypto_aegis_block_xor(&msg, &tmp);
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memcpy(dst, msg.bytes, size);
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}
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}
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static void crypto_aegis256_decrypt_chunk(struct aegis_state *state, u8 *dst,
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const u8 *src, unsigned int size)
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{
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union aegis_block tmp;
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if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
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while (size >= AEGIS_BLOCK_SIZE) {
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union aegis_block *dst_blk =
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(union aegis_block *)dst;
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const union aegis_block *src_blk =
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(const union aegis_block *)src;
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tmp = state->blocks[2];
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crypto_aegis_block_and(&tmp, &state->blocks[3]);
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crypto_aegis_block_xor(&tmp, &state->blocks[5]);
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crypto_aegis_block_xor(&tmp, &state->blocks[4]);
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crypto_aegis_block_xor(&tmp, &state->blocks[1]);
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crypto_aegis_block_xor(&tmp, src_blk);
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crypto_aegis256_update_a(state, &tmp);
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*dst_blk = tmp;
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size -= AEGIS_BLOCK_SIZE;
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src += AEGIS_BLOCK_SIZE;
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dst += AEGIS_BLOCK_SIZE;
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}
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} else {
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while (size >= AEGIS_BLOCK_SIZE) {
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tmp = state->blocks[2];
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crypto_aegis_block_and(&tmp, &state->blocks[3]);
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crypto_aegis_block_xor(&tmp, &state->blocks[5]);
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crypto_aegis_block_xor(&tmp, &state->blocks[4]);
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crypto_aegis_block_xor(&tmp, &state->blocks[1]);
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crypto_xor(tmp.bytes, src, AEGIS_BLOCK_SIZE);
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crypto_aegis256_update_a(state, &tmp);
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memcpy(dst, tmp.bytes, AEGIS_BLOCK_SIZE);
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size -= AEGIS_BLOCK_SIZE;
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src += AEGIS_BLOCK_SIZE;
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dst += AEGIS_BLOCK_SIZE;
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}
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}
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if (size > 0) {
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union aegis_block msg = {};
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memcpy(msg.bytes, src, size);
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tmp = state->blocks[2];
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crypto_aegis_block_and(&tmp, &state->blocks[3]);
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crypto_aegis_block_xor(&tmp, &state->blocks[5]);
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crypto_aegis_block_xor(&tmp, &state->blocks[4]);
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crypto_aegis_block_xor(&tmp, &state->blocks[1]);
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crypto_aegis_block_xor(&msg, &tmp);
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memset(msg.bytes + size, 0, AEGIS_BLOCK_SIZE - size);
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crypto_aegis256_update_a(state, &msg);
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memcpy(dst, msg.bytes, size);
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}
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}
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static void crypto_aegis256_process_ad(struct aegis_state *state,
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struct scatterlist *sg_src,
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unsigned int assoclen)
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{
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struct scatter_walk walk;
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union aegis_block buf;
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unsigned int pos = 0;
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scatterwalk_start(&walk, sg_src);
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while (assoclen != 0) {
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unsigned int size = scatterwalk_clamp(&walk, assoclen);
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unsigned int left = size;
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void *mapped = scatterwalk_map(&walk);
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const u8 *src = (const u8 *)mapped;
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if (pos + size >= AEGIS_BLOCK_SIZE) {
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if (pos > 0) {
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unsigned int fill = AEGIS_BLOCK_SIZE - pos;
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memcpy(buf.bytes + pos, src, fill);
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crypto_aegis256_update_a(state, &buf);
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pos = 0;
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left -= fill;
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src += fill;
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}
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crypto_aegis256_ad(state, src, left);
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src += left & ~(AEGIS_BLOCK_SIZE - 1);
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left &= AEGIS_BLOCK_SIZE - 1;
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}
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memcpy(buf.bytes + pos, src, left);
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pos += left;
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assoclen -= size;
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scatterwalk_unmap(mapped);
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scatterwalk_advance(&walk, size);
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scatterwalk_done(&walk, 0, assoclen);
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}
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if (pos > 0) {
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memset(buf.bytes + pos, 0, AEGIS_BLOCK_SIZE - pos);
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crypto_aegis256_update_a(state, &buf);
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}
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}
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static void crypto_aegis256_process_crypt(struct aegis_state *state,
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struct aead_request *req,
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const struct aegis256_ops *ops)
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{
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struct skcipher_walk walk;
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u8 *src, *dst;
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unsigned int chunksize;
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ops->skcipher_walk_init(&walk, req, false);
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while (walk.nbytes) {
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src = walk.src.virt.addr;
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dst = walk.dst.virt.addr;
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chunksize = walk.nbytes;
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ops->crypt_chunk(state, dst, src, chunksize);
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skcipher_walk_done(&walk, 0);
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}
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}
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static void crypto_aegis256_final(struct aegis_state *state,
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union aegis_block *tag_xor,
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u64 assoclen, u64 cryptlen)
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{
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u64 assocbits = assoclen * 8;
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u64 cryptbits = cryptlen * 8;
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union aegis_block tmp;
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unsigned int i;
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tmp.words64[0] = cpu_to_le64(assocbits);
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tmp.words64[1] = cpu_to_le64(cryptbits);
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crypto_aegis_block_xor(&tmp, &state->blocks[3]);
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for (i = 0; i < 7; i++)
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crypto_aegis256_update_a(state, &tmp);
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for (i = 0; i < AEGIS256_STATE_BLOCKS; i++)
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crypto_aegis_block_xor(tag_xor, &state->blocks[i]);
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}
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static int crypto_aegis256_setkey(struct crypto_aead *aead, const u8 *key,
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unsigned int keylen)
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{
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struct aegis_ctx *ctx = crypto_aead_ctx(aead);
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if (keylen != AEGIS256_KEY_SIZE) {
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crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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memcpy(ctx->key[0].bytes, key, AEGIS_BLOCK_SIZE);
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memcpy(ctx->key[1].bytes, key + AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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return 0;
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}
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static int crypto_aegis256_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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if (authsize > AEGIS256_MAX_AUTH_SIZE)
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return -EINVAL;
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if (authsize < AEGIS256_MIN_AUTH_SIZE)
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return -EINVAL;
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return 0;
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}
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static void crypto_aegis256_crypt(struct aead_request *req,
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union aegis_block *tag_xor,
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unsigned int cryptlen,
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const struct aegis256_ops *ops)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
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struct aegis_state state;
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crypto_aegis256_init(&state, ctx->key, req->iv);
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crypto_aegis256_process_ad(&state, req->src, req->assoclen);
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crypto_aegis256_process_crypt(&state, req, ops);
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crypto_aegis256_final(&state, tag_xor, req->assoclen, cryptlen);
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}
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static int crypto_aegis256_encrypt(struct aead_request *req)
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{
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static const struct aegis256_ops ops = {
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.skcipher_walk_init = skcipher_walk_aead_encrypt,
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.crypt_chunk = crypto_aegis256_encrypt_chunk,
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};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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union aegis_block tag = {};
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unsigned int authsize = crypto_aead_authsize(tfm);
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unsigned int cryptlen = req->cryptlen;
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crypto_aegis256_crypt(req, &tag, cryptlen, &ops);
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scatterwalk_map_and_copy(tag.bytes, req->dst, req->assoclen + cryptlen,
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authsize, 1);
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return 0;
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}
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static int crypto_aegis256_decrypt(struct aead_request *req)
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{
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static const struct aegis256_ops ops = {
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.skcipher_walk_init = skcipher_walk_aead_decrypt,
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.crypt_chunk = crypto_aegis256_decrypt_chunk,
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};
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static const u8 zeros[AEGIS256_MAX_AUTH_SIZE] = {};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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union aegis_block tag;
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unsigned int authsize = crypto_aead_authsize(tfm);
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unsigned int cryptlen = req->cryptlen - authsize;
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scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
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authsize, 0);
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crypto_aegis256_crypt(req, &tag, cryptlen, &ops);
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return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
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}
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static int crypto_aegis256_init_tfm(struct crypto_aead *tfm)
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{
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return 0;
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}
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static void crypto_aegis256_exit_tfm(struct crypto_aead *tfm)
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{
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}
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static struct aead_alg crypto_aegis256_alg = {
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.setkey = crypto_aegis256_setkey,
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.setauthsize = crypto_aegis256_setauthsize,
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.encrypt = crypto_aegis256_encrypt,
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.decrypt = crypto_aegis256_decrypt,
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.init = crypto_aegis256_init_tfm,
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.exit = crypto_aegis256_exit_tfm,
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.ivsize = AEGIS256_NONCE_SIZE,
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.maxauthsize = AEGIS256_MAX_AUTH_SIZE,
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.chunksize = AEGIS_BLOCK_SIZE,
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.base = {
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.cra_flags = CRYPTO_ALG_TYPE_AEAD,
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.cra_blocksize = 1,
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.cra_ctxsize = sizeof(struct aegis_ctx),
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.cra_alignmask = 0,
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.cra_priority = 100,
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.cra_name = "aegis256",
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.cra_driver_name = "aegis256-generic",
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.cra_module = THIS_MODULE,
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}
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};
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static int __init crypto_aegis256_module_init(void)
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{
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return crypto_register_aead(&crypto_aegis256_alg);
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}
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static void __exit crypto_aegis256_module_exit(void)
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{
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crypto_unregister_aead(&crypto_aegis256_alg);
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}
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module_init(crypto_aegis256_module_init);
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module_exit(crypto_aegis256_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
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MODULE_DESCRIPTION("AEGIS-256 AEAD algorithm");
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MODULE_ALIAS_CRYPTO("aegis256");
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MODULE_ALIAS_CRYPTO("aegis256-generic");
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