582 lines
16 KiB
C
582 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* The AEGIS-128 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/simd.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/jump_label.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 <asm/simd.h>
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#include "aegis.h"
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#define AEGIS128_NONCE_SIZE 16
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#define AEGIS128_STATE_BLOCKS 5
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#define AEGIS128_KEY_SIZE 16
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#define AEGIS128_MIN_AUTH_SIZE 8
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#define AEGIS128_MAX_AUTH_SIZE 16
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struct aegis_state {
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union aegis_block blocks[AEGIS128_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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static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_simd);
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static const union aegis_block crypto_aegis_const[2] = {
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{ .words64 = {
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cpu_to_le64(U64_C(0x0d08050302010100)),
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cpu_to_le64(U64_C(0x6279e99059372215)),
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} },
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{ .words64 = {
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cpu_to_le64(U64_C(0xf12fc26d55183ddb)),
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cpu_to_le64(U64_C(0xdd28b57342311120)),
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} },
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};
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static bool aegis128_do_simd(void)
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{
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#ifdef CONFIG_CRYPTO_AEGIS128_SIMD
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if (static_branch_likely(&have_simd))
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return crypto_simd_usable();
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#endif
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return false;
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}
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static void crypto_aegis128_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[AEGIS128_STATE_BLOCKS - 1];
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for (i = AEGIS128_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_aegis128_update_a(struct aegis_state *state,
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const union aegis_block *msg,
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bool do_simd)
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{
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if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
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crypto_aegis128_update_simd(state, msg);
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return;
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}
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crypto_aegis128_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_aegis128_update_u(struct aegis_state *state, const void *msg,
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bool do_simd)
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{
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if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) && do_simd) {
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crypto_aegis128_update_simd(state, msg);
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return;
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}
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crypto_aegis128_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_aegis128_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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unsigned int i;
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key_iv = *key;
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crypto_xor(key_iv.bytes, iv, AEGIS_BLOCK_SIZE);
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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] = *key;
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state->blocks[4] = *key;
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crypto_aegis_block_xor(&state->blocks[3], &crypto_aegis_const[0]);
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crypto_aegis_block_xor(&state->blocks[4], &crypto_aegis_const[1]);
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for (i = 0; i < 5; i++) {
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crypto_aegis128_update_a(state, key, false);
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crypto_aegis128_update_a(state, &key_iv, false);
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}
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}
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static void crypto_aegis128_ad(struct aegis_state *state,
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const u8 *src, unsigned int size,
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bool do_simd)
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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_aegis128_update_a(state, src_blk, do_simd);
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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_aegis128_update_u(state, src, do_simd);
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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_aegis128_wipe_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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memzero_explicit(dst, size);
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}
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static void crypto_aegis128_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[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_aegis128_update_a(state, src_blk, false);
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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[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_aegis128_update_u(state, src, false);
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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[4]);
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crypto_aegis_block_xor(&tmp, &state->blocks[1]);
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crypto_aegis128_update_a(state, &msg, false);
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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_aegis128_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[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_aegis128_update_a(state, &tmp, false);
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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[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_aegis128_update_a(state, &tmp, false);
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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[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_aegis128_update_a(state, &msg, false);
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memcpy(dst, msg.bytes, size);
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}
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}
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static void crypto_aegis128_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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bool do_simd)
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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_aegis128_update_a(state, &buf, do_simd);
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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_aegis128_ad(state, src, left, do_simd);
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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_aegis128_update_a(state, &buf, do_simd);
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}
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}
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static __always_inline
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int crypto_aegis128_process_crypt(struct aegis_state *state,
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struct skcipher_walk *walk,
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void (*crypt)(struct aegis_state *state,
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u8 *dst, const u8 *src,
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unsigned int size))
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{
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int err = 0;
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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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crypt(state, walk->dst.virt.addr, walk->src.virt.addr, nbytes);
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err = skcipher_walk_done(walk, walk->nbytes - nbytes);
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}
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return err;
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}
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static void crypto_aegis128_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_aegis128_update_a(state, &tmp, false);
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for (i = 0; i < AEGIS128_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_aegis128_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 != AEGIS128_KEY_SIZE)
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return -EINVAL;
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memcpy(ctx->key.bytes, key, AEGIS128_KEY_SIZE);
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return 0;
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}
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static int crypto_aegis128_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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if (authsize > AEGIS128_MAX_AUTH_SIZE)
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return -EINVAL;
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if (authsize < AEGIS128_MIN_AUTH_SIZE)
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return -EINVAL;
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return 0;
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}
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static int crypto_aegis128_encrypt_generic(struct aead_request *req)
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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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struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
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unsigned int cryptlen = req->cryptlen;
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struct skcipher_walk walk;
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struct aegis_state state;
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skcipher_walk_aead_encrypt(&walk, req, false);
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crypto_aegis128_init(&state, &ctx->key, req->iv);
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crypto_aegis128_process_ad(&state, req->src, req->assoclen, false);
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crypto_aegis128_process_crypt(&state, &walk,
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crypto_aegis128_encrypt_chunk);
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crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
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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_aegis128_decrypt_generic(struct aead_request *req)
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{
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static const u8 zeros[AEGIS128_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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struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
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struct skcipher_walk walk;
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struct aegis_state state;
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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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skcipher_walk_aead_decrypt(&walk, req, false);
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crypto_aegis128_init(&state, &ctx->key, req->iv);
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crypto_aegis128_process_ad(&state, req->src, req->assoclen, false);
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crypto_aegis128_process_crypt(&state, &walk,
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crypto_aegis128_decrypt_chunk);
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crypto_aegis128_final(&state, &tag, req->assoclen, cryptlen);
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if (unlikely(crypto_memneq(tag.bytes, zeros, authsize))) {
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/*
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* From Chapter 4. 'Security Analysis' of the AEGIS spec [0]
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*
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* "3. If verification fails, the decrypted plaintext and the
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* wrong authentication tag should not be given as output."
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*
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* [0] https://competitions.cr.yp.to/round3/aegisv11.pdf
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*/
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skcipher_walk_aead_decrypt(&walk, req, false);
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crypto_aegis128_process_crypt(NULL, &walk,
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crypto_aegis128_wipe_chunk);
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memzero_explicit(&tag, sizeof(tag));
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return -EBADMSG;
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}
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return 0;
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}
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static int crypto_aegis128_encrypt_simd(struct aead_request *req)
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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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struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
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unsigned int cryptlen = req->cryptlen;
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struct skcipher_walk walk;
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struct aegis_state state;
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if (!aegis128_do_simd())
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return crypto_aegis128_encrypt_generic(req);
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skcipher_walk_aead_encrypt(&walk, req, false);
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crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
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crypto_aegis128_process_ad(&state, req->src, req->assoclen, true);
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crypto_aegis128_process_crypt(&state, &walk,
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crypto_aegis128_encrypt_chunk_simd);
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crypto_aegis128_final_simd(&state, &tag, req->assoclen, cryptlen, 0);
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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_aegis128_decrypt_simd(struct aead_request *req)
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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 - authsize;
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struct aegis_ctx *ctx = crypto_aead_ctx(tfm);
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struct skcipher_walk walk;
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struct aegis_state state;
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|
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if (!aegis128_do_simd())
|
|
return crypto_aegis128_decrypt_generic(req);
|
|
|
|
scatterwalk_map_and_copy(tag.bytes, req->src, req->assoclen + cryptlen,
|
|
authsize, 0);
|
|
|
|
skcipher_walk_aead_decrypt(&walk, req, false);
|
|
crypto_aegis128_init_simd(&state, &ctx->key, req->iv);
|
|
crypto_aegis128_process_ad(&state, req->src, req->assoclen, true);
|
|
crypto_aegis128_process_crypt(&state, &walk,
|
|
crypto_aegis128_decrypt_chunk_simd);
|
|
|
|
if (unlikely(crypto_aegis128_final_simd(&state, &tag, req->assoclen,
|
|
cryptlen, authsize))) {
|
|
skcipher_walk_aead_decrypt(&walk, req, false);
|
|
crypto_aegis128_process_crypt(NULL, &walk,
|
|
crypto_aegis128_wipe_chunk);
|
|
return -EBADMSG;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct aead_alg crypto_aegis128_alg_generic = {
|
|
.setkey = crypto_aegis128_setkey,
|
|
.setauthsize = crypto_aegis128_setauthsize,
|
|
.encrypt = crypto_aegis128_encrypt_generic,
|
|
.decrypt = crypto_aegis128_decrypt_generic,
|
|
|
|
.ivsize = AEGIS128_NONCE_SIZE,
|
|
.maxauthsize = AEGIS128_MAX_AUTH_SIZE,
|
|
.chunksize = AEGIS_BLOCK_SIZE,
|
|
|
|
.base.cra_blocksize = 1,
|
|
.base.cra_ctxsize = sizeof(struct aegis_ctx),
|
|
.base.cra_alignmask = 0,
|
|
.base.cra_priority = 100,
|
|
.base.cra_name = "aegis128",
|
|
.base.cra_driver_name = "aegis128-generic",
|
|
.base.cra_module = THIS_MODULE,
|
|
};
|
|
|
|
static struct aead_alg crypto_aegis128_alg_simd = {
|
|
.setkey = crypto_aegis128_setkey,
|
|
.setauthsize = crypto_aegis128_setauthsize,
|
|
.encrypt = crypto_aegis128_encrypt_simd,
|
|
.decrypt = crypto_aegis128_decrypt_simd,
|
|
|
|
.ivsize = AEGIS128_NONCE_SIZE,
|
|
.maxauthsize = AEGIS128_MAX_AUTH_SIZE,
|
|
.chunksize = AEGIS_BLOCK_SIZE,
|
|
|
|
.base.cra_blocksize = 1,
|
|
.base.cra_ctxsize = sizeof(struct aegis_ctx),
|
|
.base.cra_alignmask = 0,
|
|
.base.cra_priority = 200,
|
|
.base.cra_name = "aegis128",
|
|
.base.cra_driver_name = "aegis128-simd",
|
|
.base.cra_module = THIS_MODULE,
|
|
};
|
|
|
|
static int __init crypto_aegis128_module_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = crypto_register_aead(&crypto_aegis128_alg_generic);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
|
|
crypto_aegis128_have_simd()) {
|
|
ret = crypto_register_aead(&crypto_aegis128_alg_simd);
|
|
if (ret) {
|
|
crypto_unregister_aead(&crypto_aegis128_alg_generic);
|
|
return ret;
|
|
}
|
|
static_branch_enable(&have_simd);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __exit crypto_aegis128_module_exit(void)
|
|
{
|
|
if (IS_ENABLED(CONFIG_CRYPTO_AEGIS128_SIMD) &&
|
|
crypto_aegis128_have_simd())
|
|
crypto_unregister_aead(&crypto_aegis128_alg_simd);
|
|
|
|
crypto_unregister_aead(&crypto_aegis128_alg_generic);
|
|
}
|
|
|
|
subsys_initcall(crypto_aegis128_module_init);
|
|
module_exit(crypto_aegis128_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
|
|
MODULE_DESCRIPTION("AEGIS-128 AEAD algorithm");
|
|
MODULE_ALIAS_CRYPTO("aegis128");
|
|
MODULE_ALIAS_CRYPTO("aegis128-generic");
|
|
MODULE_ALIAS_CRYPTO("aegis128-simd");
|