linux/crypto/aegis.h
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   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * AEGIS common definitions
   4 *
   5 * Copyright (c) 2018 Ondrej Mosnacek <omosnacek@gmail.com>
   6 * Copyright (c) 2018 Red Hat, Inc. All rights reserved.
   7 */
   8
   9#ifndef _CRYPTO_AEGIS_H
  10#define _CRYPTO_AEGIS_H
  11
  12#include <crypto/aes.h>
  13#include <linux/bitops.h>
  14#include <linux/types.h>
  15
  16#define AEGIS_BLOCK_SIZE 16
  17
  18union aegis_block {
  19        __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
  20        __le32 words32[AEGIS_BLOCK_SIZE / sizeof(__le32)];
  21        u8 bytes[AEGIS_BLOCK_SIZE];
  22};
  23
  24#define AEGIS_BLOCK_ALIGN (__alignof__(union aegis_block))
  25#define AEGIS_ALIGNED(p) IS_ALIGNED((uintptr_t)p, AEGIS_BLOCK_ALIGN)
  26
  27static __always_inline void crypto_aegis_block_xor(union aegis_block *dst,
  28                                                   const union aegis_block *src)
  29{
  30        dst->words64[0] ^= src->words64[0];
  31        dst->words64[1] ^= src->words64[1];
  32}
  33
  34static __always_inline void crypto_aegis_block_and(union aegis_block *dst,
  35                                                   const union aegis_block *src)
  36{
  37        dst->words64[0] &= src->words64[0];
  38        dst->words64[1] &= src->words64[1];
  39}
  40
  41static __always_inline void crypto_aegis_aesenc(union aegis_block *dst,
  42                                                const union aegis_block *src,
  43                                                const union aegis_block *key)
  44{
  45        const u8  *s  = src->bytes;
  46        const u32 *t = crypto_ft_tab[0];
  47        u32 d0, d1, d2, d3;
  48
  49        d0 = t[s[ 0]] ^ rol32(t[s[ 5]], 8) ^ rol32(t[s[10]], 16) ^ rol32(t[s[15]], 24);
  50        d1 = t[s[ 4]] ^ rol32(t[s[ 9]], 8) ^ rol32(t[s[14]], 16) ^ rol32(t[s[ 3]], 24);
  51        d2 = t[s[ 8]] ^ rol32(t[s[13]], 8) ^ rol32(t[s[ 2]], 16) ^ rol32(t[s[ 7]], 24);
  52        d3 = t[s[12]] ^ rol32(t[s[ 1]], 8) ^ rol32(t[s[ 6]], 16) ^ rol32(t[s[11]], 24);
  53
  54        dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
  55        dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
  56        dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
  57        dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
  58}
  59
  60#endif /* _CRYPTO_AEGIS_H */
  61