2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
4 * Copyright (C) 2014 Linaro Ltd <ard.biesheuvel@linaro.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
12 #include <asm/unaligned.h>
13 #include <crypto/internal/hash.h>
14 #include <crypto/sha.h>
15 #include <crypto/sha256_base.h>
16 #include <linux/cpufeature.h>
17 #include <linux/crypto.h>
18 #include <linux/module.h>
20 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
21 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
22 MODULE_LICENSE("GPL v2");
24 struct sha256_ce_state
{
25 struct sha256_state sst
;
29 asmlinkage
void sha2_ce_transform(struct sha256_ce_state
*sst
, u8
const *src
,
32 const u32 sha256_ce_offsetof_count
= offsetof(struct sha256_ce_state
,
34 const u32 sha256_ce_offsetof_finalize
= offsetof(struct sha256_ce_state
,
37 static int sha256_ce_update(struct shash_desc
*desc
, const u8
*data
,
40 struct sha256_ce_state
*sctx
= shash_desc_ctx(desc
);
43 kernel_neon_begin_partial(28);
44 sha256_base_do_update(desc
, data
, len
,
45 (sha256_block_fn
*)sha2_ce_transform
);
51 static int sha256_ce_finup(struct shash_desc
*desc
, const u8
*data
,
52 unsigned int len
, u8
*out
)
54 struct sha256_ce_state
*sctx
= shash_desc_ctx(desc
);
55 bool finalize
= !sctx
->sst
.count
&& !(len
% SHA256_BLOCK_SIZE
);
58 * Allow the asm code to perform the finalization if there is no
59 * partial data and the input is a round multiple of the block size.
61 sctx
->finalize
= finalize
;
63 kernel_neon_begin_partial(28);
64 sha256_base_do_update(desc
, data
, len
,
65 (sha256_block_fn
*)sha2_ce_transform
);
67 sha256_base_do_finalize(desc
,
68 (sha256_block_fn
*)sha2_ce_transform
);
70 return sha256_base_finish(desc
, out
);
73 static int sha256_ce_final(struct shash_desc
*desc
, u8
*out
)
75 struct sha256_ce_state
*sctx
= shash_desc_ctx(desc
);
78 kernel_neon_begin_partial(28);
79 sha256_base_do_finalize(desc
, (sha256_block_fn
*)sha2_ce_transform
);
81 return sha256_base_finish(desc
, out
);
84 static struct shash_alg algs
[] = { {
85 .init
= sha224_base_init
,
86 .update
= sha256_ce_update
,
87 .final
= sha256_ce_final
,
88 .finup
= sha256_ce_finup
,
89 .descsize
= sizeof(struct sha256_ce_state
),
90 .digestsize
= SHA224_DIGEST_SIZE
,
93 .cra_driver_name
= "sha224-ce",
95 .cra_flags
= CRYPTO_ALG_TYPE_SHASH
,
96 .cra_blocksize
= SHA256_BLOCK_SIZE
,
97 .cra_module
= THIS_MODULE
,
100 .init
= sha256_base_init
,
101 .update
= sha256_ce_update
,
102 .final
= sha256_ce_final
,
103 .finup
= sha256_ce_finup
,
104 .descsize
= sizeof(struct sha256_ce_state
),
105 .digestsize
= SHA256_DIGEST_SIZE
,
107 .cra_name
= "sha256",
108 .cra_driver_name
= "sha256-ce",
110 .cra_flags
= CRYPTO_ALG_TYPE_SHASH
,
111 .cra_blocksize
= SHA256_BLOCK_SIZE
,
112 .cra_module
= THIS_MODULE
,
116 static int __init
sha2_ce_mod_init(void)
118 return crypto_register_shashes(algs
, ARRAY_SIZE(algs
));
121 static void __exit
sha2_ce_mod_fini(void)
123 crypto_unregister_shashes(algs
, ARRAY_SIZE(algs
));
126 module_cpu_feature_match(SHA2
, sha2_ce_mod_init
);
127 module_exit(sha2_ce_mod_fini
);