546 lines
14 KiB
C
546 lines
14 KiB
C
/*
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* The MORUS-640 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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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <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 MORUS640_WORD_SIZE 4
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#define MORUS640_BLOCK_SIZE (MORUS_BLOCK_WORDS * MORUS640_WORD_SIZE)
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#define MORUS640_BLOCK_ALIGN (__alignof__(__le32))
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#define MORUS640_ALIGNED(p) IS_ALIGNED((uintptr_t)p, MORUS640_BLOCK_ALIGN)
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struct morus640_block {
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u32 words[MORUS_BLOCK_WORDS];
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};
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union morus640_block_in {
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__le32 words[MORUS_BLOCK_WORDS];
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u8 bytes[MORUS640_BLOCK_SIZE];
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};
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struct morus640_state {
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struct morus640_block s[MORUS_STATE_BLOCKS];
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};
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struct morus640_ctx {
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struct morus640_block key;
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};
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struct morus640_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 morus640_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 morus640_block crypto_morus640_const[2] = {
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{ .words = {
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U32_C(0x02010100),
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U32_C(0x0d080503),
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U32_C(0x59372215),
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U32_C(0x6279e990),
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} },
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{ .words = {
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U32_C(0x55183ddb),
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U32_C(0xf12fc26d),
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U32_C(0x42311120),
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U32_C(0xdd28b573),
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} },
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};
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static void crypto_morus640_round(struct morus640_block *b0,
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struct morus640_block *b1,
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struct morus640_block *b2,
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struct morus640_block *b3,
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struct morus640_block *b4,
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const struct morus640_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 morus640_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] = rol32(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_morus640_update(struct morus640_state *state,
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const struct morus640_block *m)
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{
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static const struct morus640_block z = {};
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struct morus640_block *s = state->s;
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crypto_morus640_round(&s[0], &s[1], &s[2], &s[3], &s[4], &z, 5, 1);
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crypto_morus640_round(&s[1], &s[2], &s[3], &s[4], &s[0], m, 31, 2);
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crypto_morus640_round(&s[2], &s[3], &s[4], &s[0], &s[1], m, 7, 3);
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crypto_morus640_round(&s[3], &s[4], &s[0], &s[1], &s[2], m, 22, 2);
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crypto_morus640_round(&s[4], &s[0], &s[1], &s[2], &s[3], m, 13, 1);
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}
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static void crypto_morus640_load_a(struct morus640_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] = le32_to_cpu(*(const __le32 *)src);
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src += MORUS640_WORD_SIZE;
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}
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}
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static void crypto_morus640_load_u(struct morus640_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_le32(src);
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src += MORUS640_WORD_SIZE;
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}
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}
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static void crypto_morus640_load(struct morus640_block *dst, const u8 *src)
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{
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if (MORUS640_ALIGNED(src))
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crypto_morus640_load_a(dst, src);
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else
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crypto_morus640_load_u(dst, src);
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}
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static void crypto_morus640_store_a(u8 *dst, const struct morus640_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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*(__le32 *)dst = cpu_to_le32(src->words[i]);
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dst += MORUS640_WORD_SIZE;
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}
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}
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static void crypto_morus640_store_u(u8 *dst, const struct morus640_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_le32(src->words[i], dst);
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dst += MORUS640_WORD_SIZE;
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}
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}
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static void crypto_morus640_store(u8 *dst, const struct morus640_block *src)
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{
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if (MORUS640_ALIGNED(dst))
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crypto_morus640_store_a(dst, src);
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else
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crypto_morus640_store_u(dst, src);
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}
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static void crypto_morus640_ad(struct morus640_state *state, const u8 *src,
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unsigned int size)
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{
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struct morus640_block m;
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if (MORUS640_ALIGNED(src)) {
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while (size >= MORUS640_BLOCK_SIZE) {
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crypto_morus640_load_a(&m, src);
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crypto_morus640_update(state, &m);
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size -= MORUS640_BLOCK_SIZE;
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src += MORUS640_BLOCK_SIZE;
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}
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} else {
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while (size >= MORUS640_BLOCK_SIZE) {
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crypto_morus640_load_u(&m, src);
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crypto_morus640_update(state, &m);
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size -= MORUS640_BLOCK_SIZE;
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src += MORUS640_BLOCK_SIZE;
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}
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}
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}
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static void crypto_morus640_core(const struct morus640_state *state,
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struct morus640_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_morus640_encrypt_chunk(struct morus640_state *state, u8 *dst,
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const u8 *src, unsigned int size)
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{
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struct morus640_block c, m;
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if (MORUS640_ALIGNED(src) && MORUS640_ALIGNED(dst)) {
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while (size >= MORUS640_BLOCK_SIZE) {
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crypto_morus640_load_a(&m, src);
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c = m;
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crypto_morus640_core(state, &c);
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crypto_morus640_store_a(dst, &c);
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crypto_morus640_update(state, &m);
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src += MORUS640_BLOCK_SIZE;
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dst += MORUS640_BLOCK_SIZE;
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size -= MORUS640_BLOCK_SIZE;
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}
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} else {
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while (size >= MORUS640_BLOCK_SIZE) {
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crypto_morus640_load_u(&m, src);
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c = m;
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crypto_morus640_core(state, &c);
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crypto_morus640_store_u(dst, &c);
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crypto_morus640_update(state, &m);
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src += MORUS640_BLOCK_SIZE;
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dst += MORUS640_BLOCK_SIZE;
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size -= MORUS640_BLOCK_SIZE;
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}
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}
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if (size > 0) {
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union morus640_block_in tail;
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memcpy(tail.bytes, src, size);
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memset(tail.bytes + size, 0, MORUS640_BLOCK_SIZE - size);
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crypto_morus640_load_a(&m, tail.bytes);
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c = m;
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crypto_morus640_core(state, &c);
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crypto_morus640_store_a(tail.bytes, &c);
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crypto_morus640_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_morus640_decrypt_chunk(struct morus640_state *state, u8 *dst,
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const u8 *src, unsigned int size)
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{
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struct morus640_block m;
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if (MORUS640_ALIGNED(src) && MORUS640_ALIGNED(dst)) {
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while (size >= MORUS640_BLOCK_SIZE) {
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crypto_morus640_load_a(&m, src);
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crypto_morus640_core(state, &m);
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crypto_morus640_store_a(dst, &m);
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crypto_morus640_update(state, &m);
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src += MORUS640_BLOCK_SIZE;
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dst += MORUS640_BLOCK_SIZE;
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size -= MORUS640_BLOCK_SIZE;
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}
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} else {
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while (size >= MORUS640_BLOCK_SIZE) {
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crypto_morus640_load_u(&m, src);
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crypto_morus640_core(state, &m);
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crypto_morus640_store_u(dst, &m);
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crypto_morus640_update(state, &m);
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src += MORUS640_BLOCK_SIZE;
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dst += MORUS640_BLOCK_SIZE;
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size -= MORUS640_BLOCK_SIZE;
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}
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}
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if (size > 0) {
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union morus640_block_in tail;
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memcpy(tail.bytes, src, size);
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memset(tail.bytes + size, 0, MORUS640_BLOCK_SIZE - size);
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crypto_morus640_load_a(&m, tail.bytes);
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crypto_morus640_core(state, &m);
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crypto_morus640_store_a(tail.bytes, &m);
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memset(tail.bytes + size, 0, MORUS640_BLOCK_SIZE - size);
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crypto_morus640_load_a(&m, tail.bytes);
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crypto_morus640_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_morus640_init(struct morus640_state *state,
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const struct morus640_block *key,
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const u8 *iv)
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{
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static const struct morus640_block z = {};
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unsigned int i;
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crypto_morus640_load(&state->s[0], iv);
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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] = U32_C(0xFFFFFFFF);
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state->s[3] = crypto_morus640_const[0];
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state->s[4] = crypto_morus640_const[1];
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for (i = 0; i < 16; i++)
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crypto_morus640_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_morus640_process_ad(struct morus640_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 morus640_block m;
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union morus640_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 >= MORUS640_BLOCK_SIZE) {
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if (pos > 0) {
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unsigned int fill = MORUS640_BLOCK_SIZE - pos;
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memcpy(buf.bytes + pos, src, fill);
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crypto_morus640_load_a(&m, buf.bytes);
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crypto_morus640_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_morus640_ad(state, src, left);
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src += left & ~(MORUS640_BLOCK_SIZE - 1);
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left &= MORUS640_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, MORUS640_BLOCK_SIZE - pos);
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crypto_morus640_load_a(&m, buf.bytes);
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crypto_morus640_update(state, &m);
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}
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}
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static void crypto_morus640_process_crypt(struct morus640_state *state,
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struct aead_request *req,
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const struct morus640_ops *ops)
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{
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struct skcipher_walk walk;
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u8 *dst;
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const u8 *src;
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ops->skcipher_walk_init(&walk, req, false);
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while (walk.nbytes) {
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src = walk.src.virt.addr;
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dst = walk.dst.virt.addr;
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ops->crypt_chunk(state, dst, src, walk.nbytes);
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skcipher_walk_done(&walk, 0);
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}
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}
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static void crypto_morus640_final(struct morus640_state *state,
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struct morus640_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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u32 assocbits_lo = (u32)assocbits;
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u32 assocbits_hi = (u32)(assocbits >> 32);
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u32 cryptbits_lo = (u32)cryptbits;
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u32 cryptbits_hi = (u32)(cryptbits >> 32);
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struct morus640_block tmp;
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unsigned int i;
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tmp.words[0] = cpu_to_le32(assocbits_lo);
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tmp.words[1] = cpu_to_le32(assocbits_hi);
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tmp.words[2] = cpu_to_le32(cryptbits_lo);
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tmp.words[3] = cpu_to_le32(cryptbits_hi);
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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_morus640_update(state, &tmp);
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crypto_morus640_core(state, tag_xor);
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}
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static int crypto_morus640_setkey(struct crypto_aead *aead, const u8 *key,
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unsigned int keylen)
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{
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struct morus640_ctx *ctx = crypto_aead_ctx(aead);
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if (keylen != MORUS640_BLOCK_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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crypto_morus640_load(&ctx->key, key);
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return 0;
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}
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static int crypto_morus640_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_morus640_crypt(struct aead_request *req,
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struct morus640_block *tag_xor,
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unsigned int cryptlen,
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const struct morus640_ops *ops)
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{
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
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struct morus640_state state;
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crypto_morus640_init(&state, &ctx->key, req->iv);
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crypto_morus640_process_ad(&state, req->src, req->assoclen);
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crypto_morus640_process_crypt(&state, req, ops);
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crypto_morus640_final(&state, tag_xor, req->assoclen, cryptlen);
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}
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static int crypto_morus640_encrypt(struct aead_request *req)
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{
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static const struct morus640_ops ops = {
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.skcipher_walk_init = skcipher_walk_aead_encrypt,
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.crypt_chunk = crypto_morus640_encrypt_chunk,
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};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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struct morus640_block tag = {};
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union morus640_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_morus640_crypt(req, &tag, cryptlen, &ops);
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crypto_morus640_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_morus640_decrypt(struct aead_request *req)
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{
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static const struct morus640_ops ops = {
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.skcipher_walk_init = skcipher_walk_aead_decrypt,
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.crypt_chunk = crypto_morus640_decrypt_chunk,
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};
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static const u8 zeros[MORUS640_BLOCK_SIZE] = {};
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struct crypto_aead *tfm = crypto_aead_reqtfm(req);
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union morus640_block_in tag_in;
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struct morus640_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,
|
|
req->assoclen + cryptlen, authsize, 0);
|
|
|
|
crypto_morus640_load(&tag, tag_in.bytes);
|
|
crypto_morus640_crypt(req, &tag, cryptlen, &ops);
|
|
crypto_morus640_store(tag_in.bytes, &tag);
|
|
|
|
return crypto_memneq(tag_in.bytes, zeros, authsize) ? -EBADMSG : 0;
|
|
}
|
|
|
|
static int crypto_morus640_init_tfm(struct crypto_aead *tfm)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void crypto_morus640_exit_tfm(struct crypto_aead *tfm)
|
|
{
|
|
}
|
|
|
|
static struct aead_alg crypto_morus640_alg = {
|
|
.setkey = crypto_morus640_setkey,
|
|
.setauthsize = crypto_morus640_setauthsize,
|
|
.encrypt = crypto_morus640_encrypt,
|
|
.decrypt = crypto_morus640_decrypt,
|
|
.init = crypto_morus640_init_tfm,
|
|
.exit = crypto_morus640_exit_tfm,
|
|
|
|
.ivsize = MORUS_NONCE_SIZE,
|
|
.maxauthsize = MORUS_MAX_AUTH_SIZE,
|
|
.chunksize = MORUS640_BLOCK_SIZE,
|
|
|
|
.base = {
|
|
.cra_flags = CRYPTO_ALG_TYPE_AEAD,
|
|
.cra_blocksize = 1,
|
|
.cra_ctxsize = sizeof(struct morus640_ctx),
|
|
.cra_alignmask = 0,
|
|
|
|
.cra_priority = 100,
|
|
|
|
.cra_name = "morus640",
|
|
.cra_driver_name = "morus640-generic",
|
|
|
|
.cra_module = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init crypto_morus640_module_init(void)
|
|
{
|
|
return crypto_register_aead(&crypto_morus640_alg);
|
|
}
|
|
|
|
static void __exit crypto_morus640_module_exit(void)
|
|
{
|
|
crypto_unregister_aead(&crypto_morus640_alg);
|
|
}
|
|
|
|
module_init(crypto_morus640_module_init);
|
|
module_exit(crypto_morus640_module_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
|
|
MODULE_DESCRIPTION("MORUS-640 AEAD algorithm");
|
|
MODULE_ALIAS_CRYPTO("morus640");
|
|
MODULE_ALIAS_CRYPTO("morus640-generic");
|