linux/crypto/cast6_generic.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* Kernel cryptographic api.
 * cast6.c - Cast6 cipher algorithm [rfc2612].
 *
 * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN)
 * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption
 * algorithm.
 *
 * Copyright (C) 2003 Kartikey Mahendra Bhatt <[email protected]>.
 */


#include <asm/unaligned.h>
#include <crypto/algapi.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <crypto/cast6.h>

#define s1 …
#define s2 …
#define s3 …
#define s4 …

#define F1(D, r, m) …
#define F2(D, r, m) …
#define F3(D, r, m) …

static const u32 Tm[24][8] = …;

static const u8 Tr[4][8] = …;

/* forward octave */
static inline void W(u32 *key, unsigned int i)
{ … }

int __cast6_setkey(struct cast6_ctx *c, const u8 *in_key, unsigned int key_len)
{ … }
EXPORT_SYMBOL_GPL(…);

int cast6_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{ … }
EXPORT_SYMBOL_GPL(…);

/*forward quad round*/
static inline void Q(u32 *block, const u8 *Kr, const u32 *Km)
{ … }

/*reverse quad round*/
static inline void QBAR(u32 *block, const u8 *Kr, const u32 *Km)
{ … }

void __cast6_encrypt(const void *ctx, u8 *outbuf, const u8 *inbuf)
{ … }
EXPORT_SYMBOL_GPL(…);

static void cast6_encrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf)
{ … }

void __cast6_decrypt(const void *ctx, u8 *outbuf, const u8 *inbuf)
{ … }
EXPORT_SYMBOL_GPL(…);

static void cast6_decrypt(struct crypto_tfm *tfm, u8 *outbuf, const u8 *inbuf)
{ … }

static struct crypto_alg alg = …;

static int __init cast6_mod_init(void)
{ … }

static void __exit cast6_mod_fini(void)
{ … }

subsys_initcall(cast6_mod_init);
module_exit(cast6_mod_fini);

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