1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Glue Code for SSE2 assembler versions of Serpent Cipher
4 *
5 * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
6 *
7 * Glue code based on aesni-intel_glue.c by:
8 * Copyright (C) 2008, Intel Corp.
9 * Author: Huang Ying <ying.huang@intel.com>
10 *
11 * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by:
12 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
13 */
14
15#include <linux/module.h>
16#include <linux/types.h>
17#include <linux/crypto.h>
18#include <linux/err.h>
19#include <crypto/algapi.h>
20#include <crypto/b128ops.h>
21#include <crypto/serpent.h>
22
23#include "serpent-sse2.h"
24#include "ecb_cbc_helpers.h"
25
26static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
27 const u8 *key, unsigned int keylen)
28{
29 return __serpent_setkey(ctx: crypto_skcipher_ctx(tfm), key, keylen);
30}
31
32static void serpent_decrypt_cbc_xway(const void *ctx, u8 *dst, const u8 *src)
33{
34 u8 buf[SERPENT_PARALLEL_BLOCKS - 1][SERPENT_BLOCK_SIZE];
35 const u8 *s = src;
36
37 if (dst == src)
38 s = memcpy(buf, src, sizeof(buf));
39 serpent_dec_blk_xway(ctx, dst, src);
40 crypto_xor(dst: dst + SERPENT_BLOCK_SIZE, src: s, size: sizeof(buf));
41}
42
43static int ecb_encrypt(struct skcipher_request *req)
44{
45 ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
46 ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_enc_blk_xway);
47 ECB_BLOCK(1, __serpent_encrypt);
48 ECB_WALK_END();
49}
50
51static int ecb_decrypt(struct skcipher_request *req)
52{
53 ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
54 ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_dec_blk_xway);
55 ECB_BLOCK(1, __serpent_decrypt);
56 ECB_WALK_END();
57}
58
59static int cbc_encrypt(struct skcipher_request *req)
60{
61 CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
62 CBC_ENC_BLOCK(__serpent_encrypt);
63 CBC_WALK_END();
64}
65
66static int cbc_decrypt(struct skcipher_request *req)
67{
68 CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
69 CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_decrypt_cbc_xway);
70 CBC_DEC_BLOCK(1, __serpent_decrypt);
71 CBC_WALK_END();
72}
73
74static struct skcipher_alg serpent_algs[] = {
75 {
76 .base.cra_name = "ecb(serpent)",
77 .base.cra_driver_name = "ecb-serpent-sse2",
78 .base.cra_priority = 400,
79 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
80 .base.cra_ctxsize = sizeof(struct serpent_ctx),
81 .base.cra_module = THIS_MODULE,
82 .min_keysize = SERPENT_MIN_KEY_SIZE,
83 .max_keysize = SERPENT_MAX_KEY_SIZE,
84 .setkey = serpent_setkey_skcipher,
85 .encrypt = ecb_encrypt,
86 .decrypt = ecb_decrypt,
87 }, {
88 .base.cra_name = "cbc(serpent)",
89 .base.cra_driver_name = "cbc-serpent-sse2",
90 .base.cra_priority = 400,
91 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
92 .base.cra_ctxsize = sizeof(struct serpent_ctx),
93 .base.cra_module = THIS_MODULE,
94 .min_keysize = SERPENT_MIN_KEY_SIZE,
95 .max_keysize = SERPENT_MAX_KEY_SIZE,
96 .ivsize = SERPENT_BLOCK_SIZE,
97 .setkey = serpent_setkey_skcipher,
98 .encrypt = cbc_encrypt,
99 .decrypt = cbc_decrypt,
100 },
101};
102
103static int __init serpent_sse2_init(void)
104{
105 if (!boot_cpu_has(X86_FEATURE_XMM2)) {
106 printk(KERN_INFO "SSE2 instructions are not detected.\n");
107 return -ENODEV;
108 }
109
110 return crypto_register_skciphers(algs: serpent_algs,
111 ARRAY_SIZE(serpent_algs));
112}
113
114static void __exit serpent_sse2_exit(void)
115{
116 crypto_unregister_skciphers(algs: serpent_algs, ARRAY_SIZE(serpent_algs));
117}
118
119module_init(serpent_sse2_init);
120module_exit(serpent_sse2_exit);
121
122MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
123MODULE_LICENSE("GPL");
124MODULE_ALIAS_CRYPTO("serpent");
125

source code of linux/arch/x86/crypto/serpent_sse2_glue.c