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/sha2.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(struct sha512_state *state,
24 					     const u8 *src, 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, sha512_block_data_order_neon);
37 	kernel_neon_end();
38 
39 	return 0;
40 }
41 
42 static int sha512_neon_finup(struct shash_desc *desc, const u8 *data,
43 			     unsigned int len, u8 *out)
44 {
45 	if (!crypto_simd_usable())
46 		return sha512_arm_finup(desc, data, len, out);
47 
48 	kernel_neon_begin();
49 	if (len)
50 		sha512_base_do_update(desc, data, len,
51 				      sha512_block_data_order_neon);
52 	sha512_base_do_finalize(desc, sha512_block_data_order_neon);
53 	kernel_neon_end();
54 
55 	return sha512_base_finish(desc, out);
56 }
57 
58 static int sha512_neon_final(struct shash_desc *desc, u8 *out)
59 {
60 	return sha512_neon_finup(desc, NULL, 0, out);
61 }
62 
63 struct shash_alg sha512_neon_algs[] = { {
64 	.init			= sha384_base_init,
65 	.update			= sha512_neon_update,
66 	.final			= sha512_neon_final,
67 	.finup			= sha512_neon_finup,
68 	.descsize		= sizeof(struct sha512_state),
69 	.digestsize		= SHA384_DIGEST_SIZE,
70 	.base			= {
71 		.cra_name		= "sha384",
72 		.cra_driver_name	= "sha384-neon",
73 		.cra_priority		= 300,
74 		.cra_blocksize		= SHA384_BLOCK_SIZE,
75 		.cra_module		= THIS_MODULE,
76 
77 	}
78 },  {
79 	.init			= sha512_base_init,
80 	.update			= sha512_neon_update,
81 	.final			= sha512_neon_final,
82 	.finup			= sha512_neon_finup,
83 	.descsize		= sizeof(struct sha512_state),
84 	.digestsize		= SHA512_DIGEST_SIZE,
85 	.base			= {
86 		.cra_name		= "sha512",
87 		.cra_driver_name	= "sha512-neon",
88 		.cra_priority		= 300,
89 		.cra_blocksize		= SHA512_BLOCK_SIZE,
90 		.cra_module		= THIS_MODULE,
91 	}
92 } };
93