138 lines
3.2 KiB
C
138 lines
3.2 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
/*
|
||
|
|
* Cryptographic API.
|
||
|
|
*
|
||
|
|
* Blowfish Cipher Algorithm, by Bruce Schneier.
|
||
|
|
* http://www.counterpane.com/blowfish.html
|
||
|
|
*
|
||
|
|
* Adapted from Kerneli implementation.
|
||
|
|
*
|
||
|
|
* Copyright (c) Herbert Valerio Riedel <hvr@hvrlab.org>
|
||
|
|
* Copyright (c) Kyle McMartin <kyle@debian.org>
|
||
|
|
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
|
||
|
|
*/
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/mm.h>
|
||
|
|
#include <asm/byteorder.h>
|
||
|
|
#include <linux/crypto.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <crypto/blowfish.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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) (((x) & 0xff))
|
||
|
|
#define GET32_2(x) (((x) >> (8)) & (0xff))
|
||
|
|
#define GET32_1(x) (((x) >> (16)) & (0xff))
|
||
|
|
#define GET32_0(x) (((x) >> (24)) & (0xff))
|
||
|
|
|
||
|
|
#define bf_F(x) (((S[GET32_0(x)] + S[256 + GET32_1(x)]) ^ \
|
||
|
|
S[512 + GET32_2(x)]) + S[768 + GET32_3(x)])
|
||
|
|
|
||
|
|
#define ROUND(a, b, n) ({ b ^= P[n]; a ^= bf_F(b); })
|
||
|
|
|
||
|
|
static void bf_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
|
||
|
|
{
|
||
|
|
struct bf_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
const __be32 *in_blk = (const __be32 *)src;
|
||
|
|
__be32 *const out_blk = (__be32 *)dst;
|
||
|
|
const u32 *P = ctx->p;
|
||
|
|
const u32 *S = ctx->s;
|
||
|
|
u32 yl = be32_to_cpu(in_blk[0]);
|
||
|
|
u32 yr = be32_to_cpu(in_blk[1]);
|
||
|
|
|
||
|
|
ROUND(yr, yl, 0);
|
||
|
|
ROUND(yl, yr, 1);
|
||
|
|
ROUND(yr, yl, 2);
|
||
|
|
ROUND(yl, yr, 3);
|
||
|
|
ROUND(yr, yl, 4);
|
||
|
|
ROUND(yl, yr, 5);
|
||
|
|
ROUND(yr, yl, 6);
|
||
|
|
ROUND(yl, yr, 7);
|
||
|
|
ROUND(yr, yl, 8);
|
||
|
|
ROUND(yl, yr, 9);
|
||
|
|
ROUND(yr, yl, 10);
|
||
|
|
ROUND(yl, yr, 11);
|
||
|
|
ROUND(yr, yl, 12);
|
||
|
|
ROUND(yl, yr, 13);
|
||
|
|
ROUND(yr, yl, 14);
|
||
|
|
ROUND(yl, yr, 15);
|
||
|
|
|
||
|
|
yl ^= P[16];
|
||
|
|
yr ^= P[17];
|
||
|
|
|
||
|
|
out_blk[0] = cpu_to_be32(yr);
|
||
|
|
out_blk[1] = cpu_to_be32(yl);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void bf_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
|
||
|
|
{
|
||
|
|
struct bf_ctx *ctx = crypto_tfm_ctx(tfm);
|
||
|
|
const __be32 *in_blk = (const __be32 *)src;
|
||
|
|
__be32 *const out_blk = (__be32 *)dst;
|
||
|
|
const u32 *P = ctx->p;
|
||
|
|
const u32 *S = ctx->s;
|
||
|
|
u32 yl = be32_to_cpu(in_blk[0]);
|
||
|
|
u32 yr = be32_to_cpu(in_blk[1]);
|
||
|
|
|
||
|
|
ROUND(yr, yl, 17);
|
||
|
|
ROUND(yl, yr, 16);
|
||
|
|
ROUND(yr, yl, 15);
|
||
|
|
ROUND(yl, yr, 14);
|
||
|
|
ROUND(yr, yl, 13);
|
||
|
|
ROUND(yl, yr, 12);
|
||
|
|
ROUND(yr, yl, 11);
|
||
|
|
ROUND(yl, yr, 10);
|
||
|
|
ROUND(yr, yl, 9);
|
||
|
|
ROUND(yl, yr, 8);
|
||
|
|
ROUND(yr, yl, 7);
|
||
|
|
ROUND(yl, yr, 6);
|
||
|
|
ROUND(yr, yl, 5);
|
||
|
|
ROUND(yl, yr, 4);
|
||
|
|
ROUND(yr, yl, 3);
|
||
|
|
ROUND(yl, yr, 2);
|
||
|
|
|
||
|
|
yl ^= P[1];
|
||
|
|
yr ^= P[0];
|
||
|
|
|
||
|
|
out_blk[0] = cpu_to_be32(yr);
|
||
|
|
out_blk[1] = cpu_to_be32(yl);
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct crypto_alg alg = {
|
||
|
|
.cra_name = "blowfish",
|
||
|
|
.cra_driver_name = "blowfish-generic",
|
||
|
|
.cra_priority = 100,
|
||
|
|
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
|
||
|
|
.cra_blocksize = BF_BLOCK_SIZE,
|
||
|
|
.cra_ctxsize = sizeof(struct bf_ctx),
|
||
|
|
.cra_alignmask = 3,
|
||
|
|
.cra_module = THIS_MODULE,
|
||
|
|
.cra_u = { .cipher = {
|
||
|
|
.cia_min_keysize = BF_MIN_KEY_SIZE,
|
||
|
|
.cia_max_keysize = BF_MAX_KEY_SIZE,
|
||
|
|
.cia_setkey = blowfish_setkey,
|
||
|
|
.cia_encrypt = bf_encrypt,
|
||
|
|
.cia_decrypt = bf_decrypt } }
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init blowfish_mod_init(void)
|
||
|
|
{
|
||
|
|
return crypto_register_alg(&alg);
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __exit blowfish_mod_fini(void)
|
||
|
|
{
|
||
|
|
crypto_unregister_alg(&alg);
|
||
|
|
}
|
||
|
|
|
||
|
|
subsys_initcall(blowfish_mod_init);
|
||
|
|
module_exit(blowfish_mod_fini);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("Blowfish Cipher Algorithm");
|
||
|
|
MODULE_ALIAS_CRYPTO("blowfish");
|
||
|
|
MODULE_ALIAS_CRYPTO("blowfish-generic");
|