1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
4 *
5 * Copyright (C) 2015 Linaro Ltd <ard.biesheuvel@linaro.org>
6 */
7
8 #include <crypto/internal/hash.h>
9 #include <crypto/internal/simd.h>
10 #include <crypto/sha2.h>
11 #include <crypto/sha256_base.h>
12 #include <linux/cpufeature.h>
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15
16 #include <asm/hwcap.h>
17 #include <asm/simd.h>
18 #include <asm/neon.h>
19 #include <asm/unaligned.h>
20
21 #include "sha256_glue.h"
22
23 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
24 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
25 MODULE_LICENSE("GPL v2");
26
27 asmlinkage void sha2_ce_transform(struct sha256_state *sst, u8 const *src,
28 int blocks);
29
30 static int sha2_ce_update(struct shash_desc *desc, const u8 *data,
31 unsigned int len)
32 {
33 struct sha256_state *sctx = shash_desc_ctx(desc);
34
35 if (!crypto_simd_usable() ||
36 (sctx->count % SHA256_BLOCK_SIZE) + len < SHA256_BLOCK_SIZE)
37 return crypto_sha256_arm_update(desc, data, len);
38
39 kernel_neon_begin();
40 sha256_base_do_update(desc, data, len,
41 (sha256_block_fn *)sha2_ce_transform);
42 kernel_neon_end();
43
44 return 0;
45 }
46
47 static int sha2_ce_finup(struct shash_desc *desc, const u8 *data,
48 unsigned int len, u8 *out)
49 {
50 if (!crypto_simd_usable())
51 return crypto_sha256_arm_finup(desc, data, len, out);
52
53 kernel_neon_begin();
54 if (len)
55 sha256_base_do_update(desc, data, len,
56 (sha256_block_fn *)sha2_ce_transform);
57 sha256_base_do_finalize(desc, (sha256_block_fn *)sha2_ce_transform);
58 kernel_neon_end();
59
60 return sha256_base_finish(desc, out);
61 }
62
63 static int sha2_ce_final(struct shash_desc *desc, u8 *out)
64 {
65 return sha2_ce_finup(desc, NULL, 0, out);
66 }
67
68 static struct shash_alg algs[] = { {
69 .init = sha224_base_init,
70 .update = sha2_ce_update,
71 .final = sha2_ce_final,
72 .finup = sha2_ce_finup,
73 .descsize = sizeof(struct sha256_state),
74 .digestsize = SHA224_DIGEST_SIZE,
75 .base = {
76 .cra_name = "sha224",
77 .cra_driver_name = "sha224-ce",
78 .cra_priority = 300,
79 .cra_blocksize = SHA256_BLOCK_SIZE,
80 .cra_module = THIS_MODULE,
81 }
82 }, {
83 .init = sha256_base_init,
84 .update = sha2_ce_update,
85 .final = sha2_ce_final,
86 .finup = sha2_ce_finup,
87 .descsize = sizeof(struct sha256_state),
88 .digestsize = SHA256_DIGEST_SIZE,
89 .base = {
90 .cra_name = "sha256",
91 .cra_driver_name = "sha256-ce",
92 .cra_priority = 300,
93 .cra_blocksize = SHA256_BLOCK_SIZE,
94 .cra_module = THIS_MODULE,
95 }
96 } };
97
98 static int __init sha2_ce_mod_init(void)
99 {
100 return crypto_register_shashes(algs, ARRAY_SIZE(algs));
101 }
102
103 static void __exit sha2_ce_mod_fini(void)
104 {
105 crypto_unregister_shashes(algs, ARRAY_SIZE(algs));
106 }
107
108 module_cpu_feature_match(SHA2, sha2_ce_mod_init);
109 module_exit(sha2_ce_mod_fini);
110
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