1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * sha512-neon-glue.c - accelerated SHA-384/512 for ARM NEON
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/sha.h>
11 #include <crypto/sha512_base.h>
12 #include <linux/crypto.h>
13 #include <linux/module.h>
14 
15 #include <asm/simd.h>
16 #include <asm/neon.h>
17 
18 #include "sha512.h"
19 
20 MODULE_ALIAS_CRYPTO("sha384-neon");
21 MODULE_ALIAS_CRYPTO("sha512-neon");
22 
23 asmlinkage void sha512_block_data_order_neon(u64 *state, u8 const *src,
24 					     int blocks);
25 
26 static int sha512_neon_update(struct shash_desc *desc, const u8 *data,
27 			      unsigned int len)
28 {
29 	struct sha512_state *sctx = shash_desc_ctx(desc);
30 
31 	if (!crypto_simd_usable() ||
32 	    (sctx->count[0] % SHA512_BLOCK_SIZE) + len < SHA512_BLOCK_SIZE)
33 		return sha512_arm_update(desc, data, len);
34 
35 	kernel_neon_begin();
36 	sha512_base_do_update(desc, data, len,
37 		(sha512_block_fn *)sha512_block_data_order_neon);
38 	kernel_neon_end();
39 
40 	return 0;
41 }
42 
43 static int sha512_neon_finup(struct shash_desc *desc, const u8 *data,
44 			     unsigned int len, u8 *out)
45 {
46 	if (!crypto_simd_usable())
47 		return sha512_arm_finup(desc, data, len, out);
48 
49 	kernel_neon_begin();
50 	if (len)
51 		sha512_base_do_update(desc, data, len,
52 			(sha512_block_fn *)sha512_block_data_order_neon);
53 	sha512_base_do_finalize(desc,
54 		(sha512_block_fn *)sha512_block_data_order_neon);
55 	kernel_neon_end();
56 
57 	return sha512_base_finish(desc, out);
58 }
59 
60 static int sha512_neon_final(struct shash_desc *desc, u8 *out)
61 {
62 	return sha512_neon_finup(desc, NULL, 0, out);
63 }
64 
65 struct shash_alg sha512_neon_algs[] = { {
66 	.init			= sha384_base_init,
67 	.update			= sha512_neon_update,
68 	.final			= sha512_neon_final,
69 	.finup			= sha512_neon_finup,
70 	.descsize		= sizeof(struct sha512_state),
71 	.digestsize		= SHA384_DIGEST_SIZE,
72 	.base			= {
73 		.cra_name		= "sha384",
74 		.cra_driver_name	= "sha384-neon",
75 		.cra_priority		= 300,
76 		.cra_blocksize		= SHA384_BLOCK_SIZE,
77 		.cra_module		= THIS_MODULE,
78 
79 	}
80 },  {
81 	.init			= sha512_base_init,
82 	.update			= sha512_neon_update,
83 	.final			= sha512_neon_final,
84 	.finup			= sha512_neon_finup,
85 	.descsize		= sizeof(struct sha512_state),
86 	.digestsize		= SHA512_DIGEST_SIZE,
87 	.base			= {
88 		.cra_name		= "sha512",
89 		.cra_driver_name	= "sha512-neon",
90 		.cra_priority		= 300,
91 		.cra_blocksize		= SHA512_BLOCK_SIZE,
92 		.cra_module		= THIS_MODULE,
93 	}
94 } };
95