543 lines
14 KiB
C
543 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* The MORUS-1280 Authenticated-Encryption Algorithm
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*
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* Copyright (c) 2016-2018 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 <asm/unaligned.h>
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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/morus_common.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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#define MORUS1280_WORD_SIZE 8
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#define MORUS1280_BLOCK_SIZE (MORUS_BLOCK_WORDS * MORUS1280_WORD_SIZE)
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#define MORUS1280_BLOCK_ALIGN (__alignof__(__le64))
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#define MORUS1280_ALIGNED(p) IS_ALIGNED((uintptr_t)p, MORUS1280_BLOCK_ALIGN)
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struct morus1280_block {
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u64 words[MORUS_BLOCK_WORDS];
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};
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union morus1280_block_in {
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__le64 words[MORUS_BLOCK_WORDS];
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u8 bytes[MORUS1280_BLOCK_SIZE];
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};
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struct morus1280_state {
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struct morus1280_block s[MORUS_STATE_BLOCKS];
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};
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struct morus1280_ctx {
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struct morus1280_block key;
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};
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struct morus1280_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 morus1280_state *state,
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u8 *dst, const u8 *src, unsigned int size);
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};
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static const struct morus1280_block crypto_morus1280_const[1] = {
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{ .words = {
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U64_C(0x0d08050302010100),
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U64_C(0x6279e99059372215),
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U64_C(0xf12fc26d55183ddb),
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U64_C(0xdd28b57342311120),
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} },
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};
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static void crypto_morus1280_round(struct morus1280_block *b0,
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struct morus1280_block *b1,
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struct morus1280_block *b2,
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struct morus1280_block *b3,
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struct morus1280_block *b4,
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const struct morus1280_block *m,
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unsigned int b, unsigned int w)
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{
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unsigned int i;
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struct morus1280_block tmp;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
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b0->words[i] ^= b1->words[i] & b2->words[i];
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b0->words[i] ^= b3->words[i];
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b0->words[i] ^= m->words[i];
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b0->words[i] = rol64(b0->words[i], b);
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}
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tmp = *b3;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++)
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b3->words[(i + w) % MORUS_BLOCK_WORDS] = tmp.words[i];
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}
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static void crypto_morus1280_update(struct morus1280_state *state,
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const struct morus1280_block *m)
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{
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static const struct morus1280_block z = {};
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struct morus1280_block *s = state->s;
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crypto_morus1280_round(&s[0], &s[1], &s[2], &s[3], &s[4], &z, 13, 1);
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crypto_morus1280_round(&s[1], &s[2], &s[3], &s[4], &s[0], m, 46, 2);
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crypto_morus1280_round(&s[2], &s[3], &s[4], &s[0], &s[1], m, 38, 3);
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crypto_morus1280_round(&s[3], &s[4], &s[0], &s[1], &s[2], m, 7, 2);
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crypto_morus1280_round(&s[4], &s[0], &s[1], &s[2], &s[3], m, 4, 1);
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}
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static void crypto_morus1280_load_a(struct morus1280_block *dst, const u8 *src)
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{
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unsigned int i;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
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dst->words[i] = le64_to_cpu(*(const __le64 *)src);
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src += MORUS1280_WORD_SIZE;
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}
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}
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static void crypto_morus1280_load_u(struct morus1280_block *dst, const u8 *src)
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{
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unsigned int i;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
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dst->words[i] = get_unaligned_le64(src);
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src += MORUS1280_WORD_SIZE;
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}
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}
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static void crypto_morus1280_load(struct morus1280_block *dst, const u8 *src)
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{
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if (MORUS1280_ALIGNED(src))
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crypto_morus1280_load_a(dst, src);
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else
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crypto_morus1280_load_u(dst, src);
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}
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static void crypto_morus1280_store_a(u8 *dst, const struct morus1280_block *src)
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{
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unsigned int i;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
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*(__le64 *)dst = cpu_to_le64(src->words[i]);
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dst += MORUS1280_WORD_SIZE;
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}
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}
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static void crypto_morus1280_store_u(u8 *dst, const struct morus1280_block *src)
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{
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unsigned int i;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
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put_unaligned_le64(src->words[i], dst);
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dst += MORUS1280_WORD_SIZE;
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}
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}
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static void crypto_morus1280_store(u8 *dst, const struct morus1280_block *src)
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{
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if (MORUS1280_ALIGNED(dst))
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crypto_morus1280_store_a(dst, src);
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else
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crypto_morus1280_store_u(dst, src);
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}
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static void crypto_morus1280_ad(struct morus1280_state *state, const u8 *src,
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unsigned int size)
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{
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struct morus1280_block m;
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if (MORUS1280_ALIGNED(src)) {
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while (size >= MORUS1280_BLOCK_SIZE) {
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crypto_morus1280_load_a(&m, src);
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crypto_morus1280_update(state, &m);
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size -= MORUS1280_BLOCK_SIZE;
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src += MORUS1280_BLOCK_SIZE;
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}
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} else {
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while (size >= MORUS1280_BLOCK_SIZE) {
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crypto_morus1280_load_u(&m, src);
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crypto_morus1280_update(state, &m);
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size -= MORUS1280_BLOCK_SIZE;
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src += MORUS1280_BLOCK_SIZE;
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}
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}
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}
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static void crypto_morus1280_core(const struct morus1280_state *state,
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struct morus1280_block *blk)
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{
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unsigned int i;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++)
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blk->words[(i + 3) % MORUS_BLOCK_WORDS] ^= state->s[1].words[i];
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for (i = 0; i < MORUS_BLOCK_WORDS; i++) {
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blk->words[i] ^= state->s[0].words[i];
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blk->words[i] ^= state->s[2].words[i] & state->s[3].words[i];
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}
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}
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static void crypto_morus1280_encrypt_chunk(struct morus1280_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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struct morus1280_block c, m;
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if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
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while (size >= MORUS1280_BLOCK_SIZE) {
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crypto_morus1280_load_a(&m, src);
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c = m;
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crypto_morus1280_core(state, &c);
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crypto_morus1280_store_a(dst, &c);
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crypto_morus1280_update(state, &m);
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src += MORUS1280_BLOCK_SIZE;
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dst += MORUS1280_BLOCK_SIZE;
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size -= MORUS1280_BLOCK_SIZE;
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}
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} else {
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while (size >= MORUS1280_BLOCK_SIZE) {
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crypto_morus1280_load_u(&m, src);
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c = m;
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crypto_morus1280_core(state, &c);
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crypto_morus1280_store_u(dst, &c);
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crypto_morus1280_update(state, &m);
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src += MORUS1280_BLOCK_SIZE;
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dst += MORUS1280_BLOCK_SIZE;
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size -= MORUS1280_BLOCK_SIZE;
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}
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}
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if (size > 0) {
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union morus1280_block_in tail;
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memcpy(tail.bytes, src, size);
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memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
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crypto_morus1280_load_a(&m, tail.bytes);
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c = m;
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crypto_morus1280_core(state, &c);
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crypto_morus1280_store_a(tail.bytes, &c);
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crypto_morus1280_update(state, &m);
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memcpy(dst, tail.bytes, size);
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}
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}
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static void crypto_morus1280_decrypt_chunk(struct morus1280_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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struct morus1280_block m;
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if (MORUS1280_ALIGNED(src) && MORUS1280_ALIGNED(dst)) {
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while (size >= MORUS1280_BLOCK_SIZE) {
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crypto_morus1280_load_a(&m, src);
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crypto_morus1280_core(state, &m);
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crypto_morus1280_store_a(dst, &m);
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crypto_morus1280_update(state, &m);
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src += MORUS1280_BLOCK_SIZE;
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dst += MORUS1280_BLOCK_SIZE;
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size -= MORUS1280_BLOCK_SIZE;
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}
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} else {
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while (size >= MORUS1280_BLOCK_SIZE) {
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crypto_morus1280_load_u(&m, src);
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crypto_morus1280_core(state, &m);
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crypto_morus1280_store_u(dst, &m);
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crypto_morus1280_update(state, &m);
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src += MORUS1280_BLOCK_SIZE;
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dst += MORUS1280_BLOCK_SIZE;
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size -= MORUS1280_BLOCK_SIZE;
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}
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}
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if (size > 0) {
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union morus1280_block_in tail;
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memcpy(tail.bytes, src, size);
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memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
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crypto_morus1280_load_a(&m, tail.bytes);
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crypto_morus1280_core(state, &m);
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crypto_morus1280_store_a(tail.bytes, &m);
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memset(tail.bytes + size, 0, MORUS1280_BLOCK_SIZE - size);
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crypto_morus1280_load_a(&m, tail.bytes);
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crypto_morus1280_update(state, &m);
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memcpy(dst, tail.bytes, size);
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}
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}
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static void crypto_morus1280_init(struct morus1280_state *state,
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const struct morus1280_block *key,
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const u8 *iv)
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{
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static const struct morus1280_block z = {};
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union morus1280_block_in tmp;
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unsigned int i;
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memcpy(tmp.bytes, iv, MORUS_NONCE_SIZE);
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memset(tmp.bytes + MORUS_NONCE_SIZE, 0,
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MORUS1280_BLOCK_SIZE - MORUS_NONCE_SIZE);
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crypto_morus1280_load(&state->s[0], tmp.bytes);
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state->s[1] = *key;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++)
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state->s[2].words[i] = U64_C(0xFFFFFFFFFFFFFFFF);
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state->s[3] = z;
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state->s[4] = crypto_morus1280_const[0];
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for (i = 0; i < 16; i++)
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crypto_morus1280_update(state, &z);
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for (i = 0; i < MORUS_BLOCK_WORDS; i++)
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state->s[1].words[i] ^= key->words[i];
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}
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static void crypto_morus1280_process_ad(struct morus1280_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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struct morus1280_block m;
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union morus1280_block_in 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 >= MORUS1280_BLOCK_SIZE) {
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if (pos > 0) {
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unsigned int fill = MORUS1280_BLOCK_SIZE - pos;
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memcpy(buf.bytes + pos, src, fill);
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crypto_morus1280_load_a(&m, buf.bytes);
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crypto_morus1280_update(state, &m);
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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_morus1280_ad(state, src, left);
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src += left & ~(MORUS1280_BLOCK_SIZE - 1);
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left &= MORUS1280_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, MORUS1280_BLOCK_SIZE - pos);
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crypto_morus1280_load_a(&m, buf.bytes);
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crypto_morus1280_update(state, &m);
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}
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}
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static void crypto_morus1280_process_crypt(struct morus1280_state *state,
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struct aead_request *req,
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const struct morus1280_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_morus1280_final(struct morus1280_state *state,
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struct morus1280_block *tag_xor,
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u64 assoclen, u64 cryptlen)
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{
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struct morus1280_block tmp;
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unsigned int i;
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tmp.words[0] = assoclen * 8;
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tmp.words[1] = cryptlen * 8;
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tmp.words[2] = 0;
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tmp.words[3] = 0;
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for (i = 0; i < MORUS_BLOCK_WORDS; i++)
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state->s[4].words[i] ^= state->s[0].words[i];
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for (i = 0; i < 10; i++)
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crypto_morus1280_update(state, &tmp);
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crypto_morus1280_core(state, tag_xor);
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}
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static int crypto_morus1280_setkey(struct crypto_aead *aead, const u8 *key,
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unsigned int keylen)
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{
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struct morus1280_ctx *ctx = crypto_aead_ctx(aead);
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union morus1280_block_in tmp;
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if (keylen == MORUS1280_BLOCK_SIZE)
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crypto_morus1280_load(&ctx->key, key);
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else if (keylen == MORUS1280_BLOCK_SIZE / 2) {
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memcpy(tmp.bytes, key, keylen);
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memcpy(tmp.bytes + keylen, key, keylen);
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crypto_morus1280_load(&ctx->key, tmp.bytes);
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} else {
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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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return 0;
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}
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static int crypto_morus1280_setauthsize(struct crypto_aead *tfm,
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unsigned int authsize)
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{
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return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
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}
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static void crypto_morus1280_crypt(struct aead_request *req,
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struct morus1280_block *tag_xor,
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unsigned int cryptlen,
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const struct morus1280_ops *ops)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct morus1280_ctx *ctx = crypto_aead_ctx(tfm);
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struct morus1280_state state;
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crypto_morus1280_init(&state, &ctx->key, req->iv);
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crypto_morus1280_process_ad(&state, req->src, req->assoclen);
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crypto_morus1280_process_crypt(&state, req, ops);
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crypto_morus1280_final(&state, tag_xor, req->assoclen, cryptlen);
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}
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static int crypto_morus1280_encrypt(struct aead_request *req)
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{
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static const struct morus1280_ops ops = {
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.skcipher_walk_init = skcipher_walk_aead_encrypt,
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.crypt_chunk = crypto_morus1280_encrypt_chunk,
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};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct morus1280_block tag = {};
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union morus1280_block_in tag_out;
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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_morus1280_crypt(req, &tag, cryptlen, &ops);
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crypto_morus1280_store(tag_out.bytes, &tag);
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scatterwalk_map_and_copy(tag_out.bytes, req->dst,
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req->assoclen + cryptlen, authsize, 1);
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return 0;
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}
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static int crypto_morus1280_decrypt(struct aead_request *req)
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{
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static const struct morus1280_ops ops = {
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.skcipher_walk_init = skcipher_walk_aead_decrypt,
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.crypt_chunk = crypto_morus1280_decrypt_chunk,
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};
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static const u8 zeros[MORUS1280_BLOCK_SIZE] = {};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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union morus1280_block_in tag_in;
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struct morus1280_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_in.bytes, req->src,
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req->assoclen + cryptlen, authsize, 0);
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crypto_morus1280_load(&tag, tag_in.bytes);
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crypto_morus1280_crypt(req, &tag, cryptlen, &ops);
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crypto_morus1280_store(tag_in.bytes, &tag);
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return crypto_memneq(tag_in.bytes, zeros, authsize) ? -EBADMSG : 0;
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}
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static int crypto_morus1280_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_morus1280_exit_tfm(struct crypto_aead *tfm)
|
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{
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}
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|
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static struct aead_alg crypto_morus1280_alg = {
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.setkey = crypto_morus1280_setkey,
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.setauthsize = crypto_morus1280_setauthsize,
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.encrypt = crypto_morus1280_encrypt,
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.decrypt = crypto_morus1280_decrypt,
|
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.init = crypto_morus1280_init_tfm,
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.exit = crypto_morus1280_exit_tfm,
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|
|
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.ivsize = MORUS_NONCE_SIZE,
|
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.maxauthsize = MORUS_MAX_AUTH_SIZE,
|
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.chunksize = MORUS1280_BLOCK_SIZE,
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|
|
|
.base = {
|
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.cra_blocksize = 1,
|
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.cra_ctxsize = sizeof(struct morus1280_ctx),
|
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.cra_alignmask = 0,
|
|
|
|
.cra_priority = 100,
|
|
|
|
.cra_name = "morus1280",
|
|
.cra_driver_name = "morus1280-generic",
|
|
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
|
|
static int __init crypto_morus1280_module_init(void)
|
|
{
|
|
return crypto_register_aead(&crypto_morus1280_alg);
|
|
}
|
|
|
|
static void __exit crypto_morus1280_module_exit(void)
|
|
{
|
|
crypto_unregister_aead(&crypto_morus1280_alg);
|
|
}
|
|
|
|
subsys_initcall(crypto_morus1280_module_init);
|
|
module_exit(crypto_morus1280_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
|
|
MODULE_DESCRIPTION("MORUS-1280 AEAD algorithm");
|
|
MODULE_ALIAS_CRYPTO("morus1280");
|
|
MODULE_ALIAS_CRYPTO("morus1280-generic");
|