linux/crypto/blowfish_common.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Cryptographic API.
 *
 * Common Blowfish algorithm parts shared between the c and assembler
 * implementations.
 *
 * Blowfish Cipher Algorithm, by Bruce Schneier.
 * http://www.counterpane.com/blowfish.html
 *
 * Adapted from Kerneli implementation.
 *
 * Copyright (c) Herbert Valerio Riedel <[email protected]>
 * Copyright (c) Kyle McMartin <[email protected]>
 * Copyright (c) 2002 James Morris <[email protected]>
 */

#include <crypto/algapi.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <asm/byteorder.h>
#include <linux/types.h>
#include <crypto/blowfish.h>

static const u32 bf_pbox[16 + 2] = …;

static const u32 bf_sbox[256 * 4] = …;

/*
 * Round loop unrolling macros, S is a pointer to a S-Box array
 * organized in 4 unsigned longs at a row.
 */
#define GET32_3(x) …
#define GET32_2(x) …
#define GET32_1(x) …
#define GET32_0(x) …

#define bf_F(x) …

#define ROUND(a, b, n) …

/*
 * The blowfish encipher, processes 64-bit blocks.
 * NOTE: This function MUSTN'T respect endianess
 */
static void encrypt_block(struct bf_ctx *bctx, u32 *dst, u32 *src)
{ … }

/*
 * Calculates the blowfish S and P boxes for encryption and decryption.
 */
int blowfish_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{ … }
EXPORT_SYMBOL_GPL(…);

MODULE_LICENSE(…) …;
MODULE_DESCRIPTION(…) …;