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/internal/simd.h>
22 #include <crypto/serpent.h>
23
24 #include "serpent-sse2.h"
25 #include "ecb_cbc_helpers.h"
26
27 static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
28 const u8 *key, unsigned int keylen)
29 {
30 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
31 }
32
33 static void serpent_decrypt_cbc_xway(const void *ctx, u8 *dst, const u8 *src)
34 {
35 u8 buf[SERPENT_PARALLEL_BLOCKS - 1][SERPENT_BLOCK_SIZE];
36 const u8 *s = src;
37
38 if (dst == src)
39 s = memcpy(buf, src, sizeof(buf));
40 serpent_dec_blk_xway(ctx, dst, src);
41 crypto_xor(dst + SERPENT_BLOCK_SIZE, s, sizeof(buf));
42 }
43
44 static int ecb_encrypt(struct skcipher_request *req)
45 {
46 ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
47 ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_enc_blk_xway);
48 ECB_BLOCK(1, __serpent_encrypt);
49 ECB_WALK_END();
50 }
51
52 static int ecb_decrypt(struct skcipher_request *req)
53 {
54 ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
55 ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_dec_blk_xway);
56 ECB_BLOCK(1, __serpent_decrypt);
57 ECB_WALK_END();
58 }
59
60 static int cbc_encrypt(struct skcipher_request *req)
61 {
62 CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
63 CBC_ENC_BLOCK(__serpent_encrypt);
64 CBC_WALK_END();
65 }
66
67 static int cbc_decrypt(struct skcipher_request *req)
68 {
69 CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
70 CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_decrypt_cbc_xway);
71 CBC_DEC_BLOCK(1, __serpent_decrypt);
72 CBC_WALK_END();
73 }
74
75 static struct skcipher_alg serpent_algs[] = {
76 {
77 .base.cra_name = "__ecb(serpent)",
78 .base.cra_driver_name = "__ecb-serpent-sse2",
79 .base.cra_priority = 400,
80 .base.cra_flags = CRYPTO_ALG_INTERNAL,
81 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
82 .base.cra_ctxsize = sizeof(struct serpent_ctx),
83 .base.cra_module = THIS_MODULE,
84 .min_keysize = SERPENT_MIN_KEY_SIZE,
85 .max_keysize = SERPENT_MAX_KEY_SIZE,
86 .setkey = serpent_setkey_skcipher,
87 .encrypt = ecb_encrypt,
88 .decrypt = ecb_decrypt,
89 }, {
90 .base.cra_name = "__cbc(serpent)",
91 .base.cra_driver_name = "__cbc-serpent-sse2",
92 .base.cra_priority = 400,
93 .base.cra_flags = CRYPTO_ALG_INTERNAL,
94 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
95 .base.cra_ctxsize = sizeof(struct serpent_ctx),
96 .base.cra_module = THIS_MODULE,
97 .min_keysize = SERPENT_MIN_KEY_SIZE,
98 .max_keysize = SERPENT_MAX_KEY_SIZE,
99 .ivsize = SERPENT_BLOCK_SIZE,
100 .setkey = serpent_setkey_skcipher,
101 .encrypt = cbc_encrypt,
102 .decrypt = cbc_decrypt,
103 },
104 };
105
106 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
107
108 static int __init serpent_sse2_init(void)
109 {
110 if (!boot_cpu_has(X86_FEATURE_XMM2)) {
111 printk(KERN_INFO "SSE2 instructions are not detected.\n");
112 return -ENODEV;
113 }
114
115 return simd_register_skciphers_compat(serpent_algs,
116 ARRAY_SIZE(serpent_algs),
117 serpent_simd_algs);
118 }
119
120 static void __exit serpent_sse2_exit(void)
121 {
122 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
123 serpent_simd_algs);
124 }
125
126 module_init(serpent_sse2_init);
127 module_exit(serpent_sse2_exit);
128
129 MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized");
130 MODULE_LICENSE("GPL");
131 MODULE_ALIAS_CRYPTO("serpent");
132
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