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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - crypto/blowfish_generic.c
4 * Blowfish Cipher Algorithm, by Bruce Schneier.
5 * http://www.counterpane.com/blowfish.html
7 * Adapted from Kerneli implementation.
9 * Copyright (c) Herbert Valerio Riedel <hvr@hvrlab.org>
10 * Copyright (c) Kyle McMartin <kyle@debian.org>
11 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
19 #include <linux/init.h>
20 #include <linux/module.h>
22 #include <asm/byteorder.h>
23 #include <linux/crypto.h>
24 #include <linux/types.h>
25 #include <crypto/blowfish.h>
28 * Round loop unrolling macros, S is a pointer to a S-Box array
29 * organized in 4 unsigned longs at a row.
31 #define GET32_3(x) (((x) & 0xff))
32 #define GET32_2(x) (((x) >> (8)) & (0xff))
33 #define GET32_1(x) (((x) >> (16)) & (0xff))
34 #define GET32_0(x) (((x) >> (24)) & (0xff))
36 #define bf_F(x) (((S[GET32_0(x)] + S[256 + GET32_1(x)]) ^ \
37 S[512 + GET32_2(x)]) + S[768 + GET32_3(x)])
39 #define ROUND(a, b, n) ({ b ^= P[n]; a ^= bf_F(b); })
41 static void bf_encrypt(struct crypto_tfm
*tfm
, u8
*dst
, const u8
*src
)
43 struct bf_ctx
*ctx
= crypto_tfm_ctx(tfm
);
44 const __be32
*in_blk
= (const __be32
*)src
;
45 __be32
*const out_blk
= (__be32
*)dst
;
46 const u32
*P
= ctx
->p
;
47 const u32
*S
= ctx
->s
;
48 u32 yl
= be32_to_cpu(in_blk
[0]);
49 u32 yr
= be32_to_cpu(in_blk
[1]);
71 out_blk
[0] = cpu_to_be32(yr
);
72 out_blk
[1] = cpu_to_be32(yl
);
75 static void bf_decrypt(struct crypto_tfm
*tfm
, u8
*dst
, const u8
*src
)
77 struct bf_ctx
*ctx
= crypto_tfm_ctx(tfm
);
78 const __be32
*in_blk
= (const __be32
*)src
;
79 __be32
*const out_blk
= (__be32
*)dst
;
80 const u32
*P
= ctx
->p
;
81 const u32
*S
= ctx
->s
;
82 u32 yl
= be32_to_cpu(in_blk
[0]);
83 u32 yr
= be32_to_cpu(in_blk
[1]);
105 out_blk
[0] = cpu_to_be32(yr
);
106 out_blk
[1] = cpu_to_be32(yl
);
109 static struct crypto_alg alg
= {
110 .cra_name
= "blowfish",
111 .cra_driver_name
= "blowfish-generic",
113 .cra_flags
= CRYPTO_ALG_TYPE_CIPHER
,
114 .cra_blocksize
= BF_BLOCK_SIZE
,
115 .cra_ctxsize
= sizeof(struct bf_ctx
),
117 .cra_module
= THIS_MODULE
,
118 .cra_list
= LIST_HEAD_INIT(alg
.cra_list
),
119 .cra_u
= { .cipher
= {
120 .cia_min_keysize
= BF_MIN_KEY_SIZE
,
121 .cia_max_keysize
= BF_MAX_KEY_SIZE
,
122 .cia_setkey
= blowfish_setkey
,
123 .cia_encrypt
= bf_encrypt
,
124 .cia_decrypt
= bf_decrypt
} }
127 static int __init
blowfish_mod_init(void)
129 return crypto_register_alg(&alg
);
132 static void __exit
blowfish_mod_fini(void)
134 crypto_unregister_alg(&alg
);
137 module_init(blowfish_mod_init
);
138 module_exit(blowfish_mod_fini
);
140 MODULE_LICENSE("GPL");
141 MODULE_DESCRIPTION("Blowfish Cipher Algorithm");
142 MODULE_ALIAS("blowfish");