cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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blowfish_generic.c (3135B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Cryptographic API.
      4 *
      5 * Blowfish Cipher Algorithm, by Bruce Schneier.
      6 * http://www.counterpane.com/blowfish.html
      7 *
      8 * Adapted from Kerneli implementation.
      9 *
     10 * Copyright (c) Herbert Valerio Riedel <hvr@hvrlab.org>
     11 * Copyright (c) Kyle McMartin <kyle@debian.org>
     12 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
     13 */
     14#include <linux/init.h>
     15#include <linux/module.h>
     16#include <linux/mm.h>
     17#include <asm/unaligned.h>
     18#include <linux/crypto.h>
     19#include <linux/types.h>
     20#include <crypto/blowfish.h>
     21
     22/*
     23 * Round loop unrolling macros, S is a pointer to a S-Box array
     24 * organized in 4 unsigned longs at a row.
     25 */
     26#define GET32_3(x) (((x) & 0xff))
     27#define GET32_2(x) (((x) >> (8)) & (0xff))
     28#define GET32_1(x) (((x) >> (16)) & (0xff))
     29#define GET32_0(x) (((x) >> (24)) & (0xff))
     30
     31#define bf_F(x) (((S[GET32_0(x)] + S[256 + GET32_1(x)]) ^ \
     32		S[512 + GET32_2(x)]) + S[768 + GET32_3(x)])
     33
     34#define ROUND(a, b, n) ({ b ^= P[n]; a ^= bf_F(b); })
     35
     36static void bf_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
     37{
     38	struct bf_ctx *ctx = crypto_tfm_ctx(tfm);
     39	const u32 *P = ctx->p;
     40	const u32 *S = ctx->s;
     41	u32 yl = get_unaligned_be32(src);
     42	u32 yr = get_unaligned_be32(src + 4);
     43
     44	ROUND(yr, yl, 0);
     45	ROUND(yl, yr, 1);
     46	ROUND(yr, yl, 2);
     47	ROUND(yl, yr, 3);
     48	ROUND(yr, yl, 4);
     49	ROUND(yl, yr, 5);
     50	ROUND(yr, yl, 6);
     51	ROUND(yl, yr, 7);
     52	ROUND(yr, yl, 8);
     53	ROUND(yl, yr, 9);
     54	ROUND(yr, yl, 10);
     55	ROUND(yl, yr, 11);
     56	ROUND(yr, yl, 12);
     57	ROUND(yl, yr, 13);
     58	ROUND(yr, yl, 14);
     59	ROUND(yl, yr, 15);
     60
     61	yl ^= P[16];
     62	yr ^= P[17];
     63
     64	put_unaligned_be32(yr, dst);
     65	put_unaligned_be32(yl, dst + 4);
     66}
     67
     68static void bf_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
     69{
     70	struct bf_ctx *ctx = crypto_tfm_ctx(tfm);
     71	const u32 *P = ctx->p;
     72	const u32 *S = ctx->s;
     73	u32 yl = get_unaligned_be32(src);
     74	u32 yr = get_unaligned_be32(src + 4);
     75
     76	ROUND(yr, yl, 17);
     77	ROUND(yl, yr, 16);
     78	ROUND(yr, yl, 15);
     79	ROUND(yl, yr, 14);
     80	ROUND(yr, yl, 13);
     81	ROUND(yl, yr, 12);
     82	ROUND(yr, yl, 11);
     83	ROUND(yl, yr, 10);
     84	ROUND(yr, yl, 9);
     85	ROUND(yl, yr, 8);
     86	ROUND(yr, yl, 7);
     87	ROUND(yl, yr, 6);
     88	ROUND(yr, yl, 5);
     89	ROUND(yl, yr, 4);
     90	ROUND(yr, yl, 3);
     91	ROUND(yl, yr, 2);
     92
     93	yl ^= P[1];
     94	yr ^= P[0];
     95
     96	put_unaligned_be32(yr, dst);
     97	put_unaligned_be32(yl, dst + 4);
     98}
     99
    100static struct crypto_alg alg = {
    101	.cra_name		=	"blowfish",
    102	.cra_driver_name	=	"blowfish-generic",
    103	.cra_priority		=	100,
    104	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
    105	.cra_blocksize		=	BF_BLOCK_SIZE,
    106	.cra_ctxsize		=	sizeof(struct bf_ctx),
    107	.cra_module		=	THIS_MODULE,
    108	.cra_u			=	{ .cipher = {
    109	.cia_min_keysize	=	BF_MIN_KEY_SIZE,
    110	.cia_max_keysize	=	BF_MAX_KEY_SIZE,
    111	.cia_setkey		=	blowfish_setkey,
    112	.cia_encrypt		=	bf_encrypt,
    113	.cia_decrypt		=	bf_decrypt } }
    114};
    115
    116static int __init blowfish_mod_init(void)
    117{
    118	return crypto_register_alg(&alg);
    119}
    120
    121static void __exit blowfish_mod_fini(void)
    122{
    123	crypto_unregister_alg(&alg);
    124}
    125
    126subsys_initcall(blowfish_mod_init);
    127module_exit(blowfish_mod_fini);
    128
    129MODULE_LICENSE("GPL");
    130MODULE_DESCRIPTION("Blowfish Cipher Algorithm");
    131MODULE_ALIAS_CRYPTO("blowfish");
    132MODULE_ALIAS_CRYPTO("blowfish-generic");