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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/arm/crypto/sha2-ce-glue.c
2 * sha2-ce-glue.c - SHA-224/SHA-256 using ARMv8 Crypto Extensions
4 * Copyright (C) 2015 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.
11 #include <crypto/internal/hash.h>
12 #include <crypto/sha.h>
13 #include <linux/crypto.h>
14 #include <linux/module.h>
16 #include <asm/hwcap.h>
19 #include <asm/unaligned.h>
21 MODULE_DESCRIPTION("SHA-224/SHA-256 secure hash using ARMv8 Crypto Extensions");
22 MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
23 MODULE_LICENSE("GPL v2");
25 asmlinkage
void sha2_ce_transform(int blocks
, u8
const *src
, u32
*state
,
28 static int sha224_init(struct shash_desc
*desc
)
30 struct sha256_state
*sctx
= shash_desc_ctx(desc
);
32 *sctx
= (struct sha256_state
){
34 SHA224_H0
, SHA224_H1
, SHA224_H2
, SHA224_H3
,
35 SHA224_H4
, SHA224_H5
, SHA224_H6
, SHA224_H7
,
41 static int sha256_init(struct shash_desc
*desc
)
43 struct sha256_state
*sctx
= shash_desc_ctx(desc
);
45 *sctx
= (struct sha256_state
){
47 SHA256_H0
, SHA256_H1
, SHA256_H2
, SHA256_H3
,
48 SHA256_H4
, SHA256_H5
, SHA256_H6
, SHA256_H7
,
54 static int sha2_update(struct shash_desc
*desc
, const u8
*data
,
57 struct sha256_state
*sctx
= shash_desc_ctx(desc
);
61 return crypto_sha256_update(desc
, data
, len
);
63 partial
= sctx
->count
% SHA256_BLOCK_SIZE
;
66 if ((partial
+ len
) >= SHA256_BLOCK_SIZE
) {
70 int p
= SHA256_BLOCK_SIZE
- partial
;
72 memcpy(sctx
->buf
+ partial
, data
, p
);
77 blocks
= len
/ SHA256_BLOCK_SIZE
;
78 len
%= SHA256_BLOCK_SIZE
;
81 sha2_ce_transform(blocks
, data
, sctx
->state
,
82 partial
? sctx
->buf
: NULL
);
85 data
+= blocks
* SHA256_BLOCK_SIZE
;
89 memcpy(sctx
->buf
+ partial
, data
, len
);
93 static void sha2_final(struct shash_desc
*desc
)
95 static const u8 padding
[SHA256_BLOCK_SIZE
] = { 0x80, };
97 struct sha256_state
*sctx
= shash_desc_ctx(desc
);
98 __be64 bits
= cpu_to_be64(sctx
->count
<< 3);
99 u32 padlen
= SHA256_BLOCK_SIZE
100 - ((sctx
->count
+ sizeof(bits
)) % SHA256_BLOCK_SIZE
);
102 sha2_update(desc
, padding
, padlen
);
103 sha2_update(desc
, (const u8
*)&bits
, sizeof(bits
));
106 static int sha224_final(struct shash_desc
*desc
, u8
*out
)
108 struct sha256_state
*sctx
= shash_desc_ctx(desc
);
109 __be32
*dst
= (__be32
*)out
;
114 for (i
= 0; i
< SHA224_DIGEST_SIZE
/ sizeof(__be32
); i
++)
115 put_unaligned_be32(sctx
->state
[i
], dst
++);
117 *sctx
= (struct sha256_state
){};
121 static int sha256_final(struct shash_desc
*desc
, u8
*out
)
123 struct sha256_state
*sctx
= shash_desc_ctx(desc
);
124 __be32
*dst
= (__be32
*)out
;
129 for (i
= 0; i
< SHA256_DIGEST_SIZE
/ sizeof(__be32
); i
++)
130 put_unaligned_be32(sctx
->state
[i
], dst
++);
132 *sctx
= (struct sha256_state
){};
136 static int sha2_export(struct shash_desc
*desc
, void *out
)
138 struct sha256_state
*sctx
= shash_desc_ctx(desc
);
139 struct sha256_state
*dst
= out
;
145 static int sha2_import(struct shash_desc
*desc
, const void *in
)
147 struct sha256_state
*sctx
= shash_desc_ctx(desc
);
148 struct sha256_state
const *src
= in
;
154 static struct shash_alg algs
[] = { {
156 .update
= sha2_update
,
157 .final
= sha224_final
,
158 .export
= sha2_export
,
159 .import
= sha2_import
,
160 .descsize
= sizeof(struct sha256_state
),
161 .digestsize
= SHA224_DIGEST_SIZE
,
162 .statesize
= sizeof(struct sha256_state
),
164 .cra_name
= "sha224",
165 .cra_driver_name
= "sha224-ce",
167 .cra_flags
= CRYPTO_ALG_TYPE_SHASH
,
168 .cra_blocksize
= SHA256_BLOCK_SIZE
,
169 .cra_module
= THIS_MODULE
,
173 .update
= sha2_update
,
174 .final
= sha256_final
,
175 .export
= sha2_export
,
176 .import
= sha2_import
,
177 .descsize
= sizeof(struct sha256_state
),
178 .digestsize
= SHA256_DIGEST_SIZE
,
179 .statesize
= sizeof(struct sha256_state
),
181 .cra_name
= "sha256",
182 .cra_driver_name
= "sha256-ce",
184 .cra_flags
= CRYPTO_ALG_TYPE_SHASH
,
185 .cra_blocksize
= SHA256_BLOCK_SIZE
,
186 .cra_module
= THIS_MODULE
,
190 static int __init
sha2_ce_mod_init(void)
192 if (!(elf_hwcap2
& HWCAP2_SHA2
))
194 return crypto_register_shashes(algs
, ARRAY_SIZE(algs
));
197 static void __exit
sha2_ce_mod_fini(void)
199 crypto_unregister_shashes(algs
, ARRAY_SIZE(algs
));
202 module_init(sha2_ce_mod_init
);
203 module_exit(sha2_ce_mod_fini
);