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0f533e67d2
The generic AEGIS implementations all fail the improved AEAD tests
because they produce the wrong result with some data layouts. The issue
is that they assume that if the skcipher_walk API gives 'nbytes' not
aligned to the walksize (a.k.a. walk.stride), then it is the end of the
data. In fact, this can happen before the end. Fix them.
Fixes: f606a88e58
("crypto: aegis - Add generic AEGIS AEAD implementations")
Cc: <stable@vger.kernel.org> # v4.18+
Cc: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
523 lines
14 KiB
C
523 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* The AEGIS-128L 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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#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 AEGIS128L_CHUNK_BLOCKS 2
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#define AEGIS128L_CHUNK_SIZE (AEGIS128L_CHUNK_BLOCKS * AEGIS_BLOCK_SIZE)
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#define AEGIS128L_NONCE_SIZE 16
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#define AEGIS128L_STATE_BLOCKS 8
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#define AEGIS128L_KEY_SIZE 16
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#define AEGIS128L_MIN_AUTH_SIZE 8
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#define AEGIS128L_MAX_AUTH_SIZE 16
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union aegis_chunk {
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union aegis_block blocks[AEGIS128L_CHUNK_BLOCKS];
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u8 bytes[AEGIS128L_CHUNK_SIZE];
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};
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struct aegis_state {
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union aegis_block blocks[AEGIS128L_STATE_BLOCKS];
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};
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struct aegis_ctx {
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union aegis_block key;
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};
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struct aegis128l_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_aegis128l_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[AEGIS128L_STATE_BLOCKS - 1];
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for (i = AEGIS128L_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_aegis128l_update_a(struct aegis_state *state,
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const union aegis_chunk *msg)
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{
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crypto_aegis128l_update(state);
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crypto_aegis_block_xor(&state->blocks[0], &msg->blocks[0]);
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crypto_aegis_block_xor(&state->blocks[4], &msg->blocks[1]);
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}
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static void crypto_aegis128l_update_u(struct aegis_state *state,
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const void *msg)
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{
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crypto_aegis128l_update(state);
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crypto_xor(state->blocks[0].bytes, msg + 0 * AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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crypto_xor(state->blocks[4].bytes, msg + 1 * AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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}
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static void crypto_aegis128l_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;
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union aegis_chunk chunk;
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unsigned int i;
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memcpy(chunk.blocks[0].bytes, iv, AEGIS_BLOCK_SIZE);
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chunk.blocks[1] = *key;
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key_iv = *key;
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crypto_aegis_block_xor(&key_iv, &chunk.blocks[0]);
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state->blocks[0] = key_iv;
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state->blocks[1] = crypto_aegis_const[1];
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state->blocks[2] = crypto_aegis_const[0];
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state->blocks[3] = crypto_aegis_const[1];
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state->blocks[4] = key_iv;
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state->blocks[5] = *key;
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state->blocks[6] = *key;
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state->blocks[7] = *key;
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crypto_aegis_block_xor(&state->blocks[5], &crypto_aegis_const[0]);
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crypto_aegis_block_xor(&state->blocks[6], &crypto_aegis_const[1]);
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crypto_aegis_block_xor(&state->blocks[7], &crypto_aegis_const[0]);
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for (i = 0; i < 10; i++) {
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crypto_aegis128l_update_a(state, &chunk);
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}
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}
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static void crypto_aegis128l_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_chunk *src_chunk =
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(const union aegis_chunk *)src;
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while (size >= AEGIS128L_CHUNK_SIZE) {
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crypto_aegis128l_update_a(state, src_chunk);
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size -= AEGIS128L_CHUNK_SIZE;
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src_chunk += 1;
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}
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} else {
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while (size >= AEGIS128L_CHUNK_SIZE) {
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crypto_aegis128l_update_u(state, src);
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size -= AEGIS128L_CHUNK_SIZE;
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src += AEGIS128L_CHUNK_SIZE;
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}
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}
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}
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static void crypto_aegis128l_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_chunk tmp;
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union aegis_block *tmp0 = &tmp.blocks[0];
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union aegis_block *tmp1 = &tmp.blocks[1];
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if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
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while (size >= AEGIS128L_CHUNK_SIZE) {
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union aegis_chunk *dst_blk =
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(union aegis_chunk *)dst;
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const union aegis_chunk *src_blk =
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(const union aegis_chunk *)src;
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*tmp0 = state->blocks[2];
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crypto_aegis_block_and(tmp0, &state->blocks[3]);
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crypto_aegis_block_xor(tmp0, &state->blocks[6]);
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crypto_aegis_block_xor(tmp0, &state->blocks[1]);
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crypto_aegis_block_xor(tmp0, &src_blk->blocks[0]);
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*tmp1 = state->blocks[6];
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crypto_aegis_block_and(tmp1, &state->blocks[7]);
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crypto_aegis_block_xor(tmp1, &state->blocks[5]);
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crypto_aegis_block_xor(tmp1, &state->blocks[2]);
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crypto_aegis_block_xor(tmp1, &src_blk->blocks[1]);
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crypto_aegis128l_update_a(state, src_blk);
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*dst_blk = tmp;
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size -= AEGIS128L_CHUNK_SIZE;
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src += AEGIS128L_CHUNK_SIZE;
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dst += AEGIS128L_CHUNK_SIZE;
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}
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} else {
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while (size >= AEGIS128L_CHUNK_SIZE) {
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*tmp0 = state->blocks[2];
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crypto_aegis_block_and(tmp0, &state->blocks[3]);
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crypto_aegis_block_xor(tmp0, &state->blocks[6]);
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crypto_aegis_block_xor(tmp0, &state->blocks[1]);
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crypto_xor(tmp0->bytes, src + 0 * AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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*tmp1 = state->blocks[6];
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crypto_aegis_block_and(tmp1, &state->blocks[7]);
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crypto_aegis_block_xor(tmp1, &state->blocks[5]);
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crypto_aegis_block_xor(tmp1, &state->blocks[2]);
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crypto_xor(tmp1->bytes, src + 1 * AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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crypto_aegis128l_update_u(state, src);
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memcpy(dst, tmp.bytes, AEGIS128L_CHUNK_SIZE);
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size -= AEGIS128L_CHUNK_SIZE;
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src += AEGIS128L_CHUNK_SIZE;
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dst += AEGIS128L_CHUNK_SIZE;
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}
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}
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if (size > 0) {
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union aegis_chunk msg = {};
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memcpy(msg.bytes, src, size);
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*tmp0 = state->blocks[2];
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crypto_aegis_block_and(tmp0, &state->blocks[3]);
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crypto_aegis_block_xor(tmp0, &state->blocks[6]);
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crypto_aegis_block_xor(tmp0, &state->blocks[1]);
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*tmp1 = state->blocks[6];
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crypto_aegis_block_and(tmp1, &state->blocks[7]);
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crypto_aegis_block_xor(tmp1, &state->blocks[5]);
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crypto_aegis_block_xor(tmp1, &state->blocks[2]);
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crypto_aegis128l_update_a(state, &msg);
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crypto_aegis_block_xor(&msg.blocks[0], tmp0);
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crypto_aegis_block_xor(&msg.blocks[1], tmp1);
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memcpy(dst, msg.bytes, size);
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}
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}
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static void crypto_aegis128l_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_chunk tmp;
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union aegis_block *tmp0 = &tmp.blocks[0];
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union aegis_block *tmp1 = &tmp.blocks[1];
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if (AEGIS_ALIGNED(src) && AEGIS_ALIGNED(dst)) {
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while (size >= AEGIS128L_CHUNK_SIZE) {
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union aegis_chunk *dst_blk =
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(union aegis_chunk *)dst;
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const union aegis_chunk *src_blk =
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(const union aegis_chunk *)src;
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*tmp0 = state->blocks[2];
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crypto_aegis_block_and(tmp0, &state->blocks[3]);
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crypto_aegis_block_xor(tmp0, &state->blocks[6]);
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crypto_aegis_block_xor(tmp0, &state->blocks[1]);
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crypto_aegis_block_xor(tmp0, &src_blk->blocks[0]);
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*tmp1 = state->blocks[6];
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crypto_aegis_block_and(tmp1, &state->blocks[7]);
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crypto_aegis_block_xor(tmp1, &state->blocks[5]);
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crypto_aegis_block_xor(tmp1, &state->blocks[2]);
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crypto_aegis_block_xor(tmp1, &src_blk->blocks[1]);
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crypto_aegis128l_update_a(state, &tmp);
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*dst_blk = tmp;
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size -= AEGIS128L_CHUNK_SIZE;
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src += AEGIS128L_CHUNK_SIZE;
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dst += AEGIS128L_CHUNK_SIZE;
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}
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} else {
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while (size >= AEGIS128L_CHUNK_SIZE) {
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*tmp0 = state->blocks[2];
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crypto_aegis_block_and(tmp0, &state->blocks[3]);
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crypto_aegis_block_xor(tmp0, &state->blocks[6]);
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crypto_aegis_block_xor(tmp0, &state->blocks[1]);
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crypto_xor(tmp0->bytes, src + 0 * AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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*tmp1 = state->blocks[6];
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crypto_aegis_block_and(tmp1, &state->blocks[7]);
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crypto_aegis_block_xor(tmp1, &state->blocks[5]);
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crypto_aegis_block_xor(tmp1, &state->blocks[2]);
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crypto_xor(tmp1->bytes, src + 1 * AEGIS_BLOCK_SIZE,
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AEGIS_BLOCK_SIZE);
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crypto_aegis128l_update_a(state, &tmp);
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memcpy(dst, tmp.bytes, AEGIS128L_CHUNK_SIZE);
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size -= AEGIS128L_CHUNK_SIZE;
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src += AEGIS128L_CHUNK_SIZE;
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dst += AEGIS128L_CHUNK_SIZE;
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}
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}
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if (size > 0) {
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union aegis_chunk msg = {};
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memcpy(msg.bytes, src, size);
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*tmp0 = state->blocks[2];
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crypto_aegis_block_and(tmp0, &state->blocks[3]);
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crypto_aegis_block_xor(tmp0, &state->blocks[6]);
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crypto_aegis_block_xor(tmp0, &state->blocks[1]);
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crypto_aegis_block_xor(&msg.blocks[0], tmp0);
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*tmp1 = state->blocks[6];
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crypto_aegis_block_and(tmp1, &state->blocks[7]);
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crypto_aegis_block_xor(tmp1, &state->blocks[5]);
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crypto_aegis_block_xor(tmp1, &state->blocks[2]);
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crypto_aegis_block_xor(&msg.blocks[1], tmp1);
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memset(msg.bytes + size, 0, AEGIS128L_CHUNK_SIZE - size);
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crypto_aegis128l_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_aegis128l_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_chunk 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 >= AEGIS128L_CHUNK_SIZE) {
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if (pos > 0) {
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unsigned int fill = AEGIS128L_CHUNK_SIZE - pos;
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memcpy(buf.bytes + pos, src, fill);
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crypto_aegis128l_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_aegis128l_ad(state, src, left);
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src += left & ~(AEGIS128L_CHUNK_SIZE - 1);
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left &= AEGIS128L_CHUNK_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, AEGIS128L_CHUNK_SIZE - pos);
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crypto_aegis128l_update_a(state, &buf);
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}
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}
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static void crypto_aegis128l_process_crypt(struct aegis_state *state,
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struct aead_request *req,
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const struct aegis128l_ops *ops)
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{
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struct skcipher_walk walk;
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ops->skcipher_walk_init(&walk, req, false);
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while (walk.nbytes) {
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unsigned int nbytes = walk.nbytes;
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if (nbytes < walk.total)
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nbytes = round_down(nbytes, walk.stride);
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ops->crypt_chunk(state, walk.dst.virt.addr, walk.src.virt.addr,
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nbytes);
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skcipher_walk_done(&walk, walk.nbytes - nbytes);
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}
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}
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static void crypto_aegis128l_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_chunk tmp;
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unsigned int i;
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tmp.blocks[0].words64[0] = cpu_to_le64(assocbits);
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tmp.blocks[0].words64[1] = cpu_to_le64(cryptbits);
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crypto_aegis_block_xor(&tmp.blocks[0], &state->blocks[2]);
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tmp.blocks[1] = tmp.blocks[0];
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for (i = 0; i < 7; i++)
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crypto_aegis128l_update_a(state, &tmp);
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for (i = 0; i < 7; 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_aegis128l_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 != AEGIS128L_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.bytes, key, AEGIS128L_KEY_SIZE);
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return 0;
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}
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static int crypto_aegis128l_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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if (authsize > AEGIS128L_MAX_AUTH_SIZE)
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return -EINVAL;
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if (authsize < AEGIS128L_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_aegis128l_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 aegis128l_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_aegis128l_init(&state, &ctx->key, req->iv);
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crypto_aegis128l_process_ad(&state, req->src, req->assoclen);
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crypto_aegis128l_process_crypt(&state, req, ops);
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crypto_aegis128l_final(&state, tag_xor, req->assoclen, cryptlen);
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}
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static int crypto_aegis128l_encrypt(struct aead_request *req)
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{
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static const struct aegis128l_ops ops = {
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.skcipher_walk_init = skcipher_walk_aead_encrypt,
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.crypt_chunk = crypto_aegis128l_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_aegis128l_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;
|
|
}
|
|
|
|
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_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");
|