1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Glue Code for x86_64/AVX2 assembler optimized version of Serpent
4 *
5 * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
6 */
7
8 #include <linux/module.h>
9 #include <linux/types.h>
10 #include <linux/crypto.h>
11 #include <linux/err.h>
12 #include <crypto/algapi.h>
13 #include <crypto/internal/simd.h>
14 #include <crypto/serpent.h>
15
16 #include "serpent-avx.h"
17 #include "ecb_cbc_helpers.h"
18
19 #define SERPENT_AVX2_PARALLEL_BLOCKS 16
20
21 /* 16-way AVX2 parallel cipher functions */
22 asmlinkage void serpent_ecb_enc_16way(const void *ctx, u8 *dst, const u8 *src);
23 asmlinkage void serpent_ecb_dec_16way(const void *ctx, u8 *dst, const u8 *src);
24 asmlinkage void serpent_cbc_dec_16way(const void *ctx, u8 *dst, const u8 *src);
25
26 static int serpent_setkey_skcipher(struct crypto_skcipher *tfm,
27 const u8 *key, unsigned int keylen)
28 {
29 return __serpent_setkey(crypto_skcipher_ctx(tfm), key, keylen);
30 }
31
32 static int ecb_encrypt(struct skcipher_request *req)
33 {
34 ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
35 ECB_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_ecb_enc_16way);
36 ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_enc_8way_avx);
37 ECB_BLOCK(1, __serpent_encrypt);
38 ECB_WALK_END();
39 }
40
41 static int ecb_decrypt(struct skcipher_request *req)
42 {
43 ECB_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
44 ECB_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_ecb_dec_16way);
45 ECB_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_ecb_dec_8way_avx);
46 ECB_BLOCK(1, __serpent_decrypt);
47 ECB_WALK_END();
48 }
49
50 static int cbc_encrypt(struct skcipher_request *req)
51 {
52 CBC_WALK_START(req, SERPENT_BLOCK_SIZE, -1);
53 CBC_ENC_BLOCK(__serpent_encrypt);
54 CBC_WALK_END();
55 }
56
57 static int cbc_decrypt(struct skcipher_request *req)
58 {
59 CBC_WALK_START(req, SERPENT_BLOCK_SIZE, SERPENT_PARALLEL_BLOCKS);
60 CBC_DEC_BLOCK(SERPENT_AVX2_PARALLEL_BLOCKS, serpent_cbc_dec_16way);
61 CBC_DEC_BLOCK(SERPENT_PARALLEL_BLOCKS, serpent_cbc_dec_8way_avx);
62 CBC_DEC_BLOCK(1, __serpent_decrypt);
63 CBC_WALK_END();
64 }
65
66 static struct skcipher_alg serpent_algs[] = {
67 {
68 .base.cra_name = "__ecb(serpent)",
69 .base.cra_driver_name = "__ecb-serpent-avx2",
70 .base.cra_priority = 600,
71 .base.cra_flags = CRYPTO_ALG_INTERNAL,
72 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
73 .base.cra_ctxsize = sizeof(struct serpent_ctx),
74 .base.cra_module = THIS_MODULE,
75 .min_keysize = SERPENT_MIN_KEY_SIZE,
76 .max_keysize = SERPENT_MAX_KEY_SIZE,
77 .setkey = serpent_setkey_skcipher,
78 .encrypt = ecb_encrypt,
79 .decrypt = ecb_decrypt,
80 }, {
81 .base.cra_name = "__cbc(serpent)",
82 .base.cra_driver_name = "__cbc-serpent-avx2",
83 .base.cra_priority = 600,
84 .base.cra_flags = CRYPTO_ALG_INTERNAL,
85 .base.cra_blocksize = SERPENT_BLOCK_SIZE,
86 .base.cra_ctxsize = sizeof(struct serpent_ctx),
87 .base.cra_module = THIS_MODULE,
88 .min_keysize = SERPENT_MIN_KEY_SIZE,
89 .max_keysize = SERPENT_MAX_KEY_SIZE,
90 .ivsize = SERPENT_BLOCK_SIZE,
91 .setkey = serpent_setkey_skcipher,
92 .encrypt = cbc_encrypt,
93 .decrypt = cbc_decrypt,
94 },
95 };
96
97 static struct simd_skcipher_alg *serpent_simd_algs[ARRAY_SIZE(serpent_algs)];
98
99 static int __init serpent_avx2_init(void)
100 {
101 const char *feature_name;
102
103 if (!boot_cpu_has(X86_FEATURE_AVX2) || !boot_cpu_has(X86_FEATURE_OSXSAVE)) {
104 pr_info("AVX2 instructions are not detected.\n");
105 return -ENODEV;
106 }
107 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
108 &feature_name)) {
109 pr_info("CPU feature '%s' is not supported.\n", feature_name);
110 return -ENODEV;
111 }
112
113 return simd_register_skciphers_compat(serpent_algs,
114 ARRAY_SIZE(serpent_algs),
115 serpent_simd_algs);
116 }
117
118 static void __exit serpent_avx2_fini(void)
119 {
120 simd_unregister_skciphers(serpent_algs, ARRAY_SIZE(serpent_algs),
121 serpent_simd_algs);
122 }
123
124 module_init(serpent_avx2_init);
125 module_exit(serpent_avx2_fini);
126
127 MODULE_LICENSE("GPL");
128 MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
129 MODULE_ALIAS_CRYPTO("serpent");
130 MODULE_ALIAS_CRYPTO("serpent-asm");
131
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